Note: Descriptions are shown in the official language in which they were submitted.
ELECTRIFIED LATCH
RELATIONSHIP TO OTHER APPLICATIONS AND PATENTS
The present application claims the benefit of U.S. Patent Application No.
17/705,829, filed March 28, 2022, which is a continuation-in-part of U.S.
Patent
Application No. 16/804,720, filed February 28, 2020, which claims the benefit
of U.S.
Provisional Patent Application No. 62/812,647, filed March 1, 2019, and U.S.
Provisional Patent Application No. 62/831,923, filed April 10, 2019.
TECHNICAL FIELD
The present invention relates to a cabinet lock for securing a door panel to a
cabinet frame; and more particularly, to an electromechanical cabinet lock
including an
actuator; and still more particularly, to an electromechanical cabinet lock
including a
drive member such as a drive screw or a drive plate, wherein the actuator is a
motor
acting on the drive member, and wherein a position sensor is configured to
trigger a
signal when a latch member of the cabinet lock translates from a locked
orientation to
an unlocked orientation; and still more particularly, an electromechanical
cabinet lock
including a temperature sensor configured to trigger a signal for powering the
actuator
based on the detected temperature, such as sending a pulsed current signal,
selecting
.. from different motor drive profiles, and/or dynamically adjusting motor
drive parameters
of the actuator to advance movement of the latch member in cold weather
conditions.
The electromechanical component of the cabinet lock may be unitized so as to
be
adaptable to an existing mechanical latching component to electrify the
cabinet lock.
BACKGROUND OF THE INVENTION
Cabinet locks, such as those used with traffic control signal boxes, typically
include a mechanical key switch which is manually turned to withdraw a latch
or
deadbolt and thereby pivotally free the cabinet door from the cabinet frame
and allow
access to the interior of the cabinet. These traffic control signal boxes may
include
controllers and related circuitry to control and coordinate traffic lights and
vehicular
traffic through the associated intersection. However, the cabinet locks used
on traffic
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Date Recue/Date Received 2023-03-28
control signal boxes are generally unmonitored, meaning any tampering or
unauthorized
access may go unnoticed for some period of time. With a focus on heightened
homeland security, there is a need for improving the integrity and remote
monitoring of
traffic control signal boxes.
In addition, signal control boxes may be subject to extreme temperatures in
certain areas of the country. For instance, in situations where a signal box
is subject to
extremely cold temperatures, the viscosity of the grease that is used to
lubricate an
actuator shaft of an actuator (e.g., stepper motor) can increase to the point
where the
movement of the actuator shaft operates in a sluggish manner or even sticks in
some
cases. This could result in the actuator failing to move the latch to an
unlocked
orientation. Thus, a remedy for sluggish or inoperative latch movement in cold
weather
is also needed. It is a principal object of the present invention to address
these, as well
as other, needs.
SUMMARY OF THE INVENTION
Briefly described, a cabinet lock for securing a door panel to a cabinet frame
includes a latching component and an electromechanical component. The latching
component has a latch housing and a latch member reciprocally translatable
between a
locked orientation whereby the latch member extends outwardly of the latch
housing to
secure the door panel to the cabinet frame and an unlocked orientation whereby
the
latch member retracts within the latch housing to free the door panel from the
cabinet
frame. The electromechanical component includes an actuator operably coupled
to a
drive member. A first end of the drive member engages the latch member whereby
powering of the actuator in a first direction translates the latch member to
the unlocked
orientation. The latch member may be a latch or dead bolt.
The actuator may be a motor and the drive member may be a drive screw. The
electromechanical component may further include a drive nut rotatably coupled
to the
actuator whereby powering of the actuator rotates the drive nut to translate
the drive
screw and latch member to the unlocked orientation. The latching component may
further include a manual actuator coupled to the latch member. The manual
actuator
may include a cylinder having a cam located at a first end whereby manual
actuation of
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Date Recue/Date Received 2023-03-28
the cylinder causes the cam to engage the latch member and drive the latch
member to
the unlocked orientation. The latching component may also further include a
biasing
member configured to bias the latch member to the locked orientation.
Additionally or
alternatively, powering of the actuator in a second direction may translate
the latch
member to the locked orientation.
In accordance with another aspect of the invention, the actuator may be a
motor
and the drive member may be a drive plate rotatable by the actuator. The
electromechanical component may further include a latch pin coupled to the
latch
member whereby powering of the actuator rotates the drive plate. A guide
channel
formed in the drive plate receives the latch pin so that rotation of the drive
plate
translates the latch member to the unlocked orientation. The latching
component may
further include a manual actuator coupled to the latch member. The manual
actuator
may include a cylinder having a cam located at a first end whereby manual
actuation of
the cylinder causes the cam to engage the latch member and drive the latch
member to
the unlocked orientation. The latching component may also further include a
biasing
member configured to bias the latch member to the locked orientation.
Additionally or
alternatively, powering of the actuator in a second direction may translate
the latch
member to the locked orientation.
In accordance with another aspect of the invention, a traffic signal control
box
comprises a cabinet have a side wall framing an opening therein to permit
access to an
interior defined by the cabinet and a door panel is mounted to the side wall
frame A
cabinet lock includes a latching component and an electromechanical component.
The
latching component has a latch housing and a latch member reciprocally
translatable
between a locked orientation whereby the latch member extends outwardly of the
latch
housing to secure the door panel to the cabinet frame and an unlocked
orientation
whereby the latch member retracts within the latch housing to free the door
panel from
the cabinet frame. The electromechanical component includes an actuator
operably
coupled to a drive member. A first end of the drive member engages the latch
member
whereby powering of the actuator in a first direction translates the latch
member to the
unlocked orientation.
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Date Recue/Date Received 2023-03-28
In accordance with a further aspect of the present invention, the
electromechanical component may further include a drive member position sensor
configured to emit a signal when the drive member translates the latch member
from the
locked orientation to the unlocked orientation. The drive member position
sensor may
comprise an optical infrared emitter and detector pair. In a further aspect,
the position
sensor may include a beam interrupter fabricated from a material having a
consistent
translucency for allowing transmission of the optical beam or the material may
define a
plurality of stratified sub-regions having different degrees of translucency
wherein the
position sensor is capable of detecting serial movement of the drive member
between a
latch-locked orientation and a latch-unlocked orientation.
In yet another aspect of the invention, a separate electromechanical component
may be retrofit-able to an existing latching component whereby a mechanical
cabinet
lock may be converted to a power operated cabinet lock.
In yet another aspect of the invention, a method is provided for retrofitting
the
electromechanical component to an existing cabinet lock having only a latching
component, the method including the steps of:
1. providing a cabinet lock having a latching component wherein the latching
component includes a latch member;
2. providing an electromechanical component including an actuator connectable
to a power source; wherein the electromechanical component further includes a
drive
member;
3. providing a connector feature; and
4. connecting the drive member to the latch member via the connector feature.
The electromechanical component may further include a position sensor for
sensing the position of the latch member wherein the method further includes
triggering
of a signal by the position sensor that the latch member is being translated
from a
locked orientation to an unlocked orientation.
In a further aspect, a cabinet lock for securing a door panel to a cabinet
housing
is provided. The cabinet lock comprises a latching component, a temperature
sensor,
and an electromechanical component. The latching component includes a latch
housing and a latch member reciprocally translatable between a locked
orientation to
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Date Recue/Date Received 2023-03-28
secure the door panel to the cabinet housing and an unlocked orientation to
free the
door panel from the cabinet housing. The temperature sensor is configured for
sensing
an ambient temperature associated with the cabinet lock. The electromechanical
component includes a printed circuit board (PCB) and an actuator (e.g.,
stepper motor).
The actuator is operably coupled to a drive member, and the drive member is
coupled
to the latch member. The PCB is in communication with the temperature sensor
and
the actuator. When the PCB receives a control signal to move the latch member
between the locked orientation and the unlocked orientation, and the
temperature
sensor senses that the ambient temperature is below a predetermined threshold
-- temperature, the PCB is configured to direct a pulsed current signal to the
actuator to
move the latch member between the locked orientation and said unlocked
orientation. It
should be understood that the present invention may also be directed to the
electromechanical component described above, as well as the cabinet lock
described
above used in association with a traffic signal control box including a
cabinet and an
associated door panel.
The pulsed current signal referred to above may be associated with a first
motor
drive profile to move the latch member between the locked orientation and said
unlocked orientation when the PCB receives a control signal to move the latch
member
between the locked and unlocked orientations, and the temperature sensor
senses that
-- the ambient temperature is below a predetermined threshold temperature.
Further, the
PCB may be configured to direct the pulsed current signal to the actuator to
move the
latch member between the locked and unlocked orientations according to a
second
motor drive profile when the sensed ambient temperature is at or above said
predetermined threshold value, and wherein said first motor drive profile is
different than
said second motor drive profile.
Further, the first motor drive profile may be one of a plurality of motor
drive
profiles, wherein the PCB is configured for selecting the first motor drive
profile from the
plurality of motor drive profiles based on the sensed ambient temperature.
Also, each
of the plurality of motor drive profiles may comprise a plurality of motor
drive parameters
including acceleration rate, deceleration rate, maximum speed, minimum speed,
acceleration motor torque current, deceleration motor torque current, run
speed motor
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Date Recue/Date Received 2023-03-28
torque current, motor holding torque current, and stepping modes. The PCB may
be
further configured to adjust any of the motor drive parameters when the pulse
current
signal is provided to the actuator to optimize retraction of the latch member.
The cabinet lock may further comprise a position sensor, wherein the PCB is
further configured to detect whether the latch member has reached the unlocked
orientation utilizing the position sensor. When the position sensor detects
that the latch
member is not in the unlocked orientation, the PCB is configured to either
select another
one of the plurality of motor drive profiles or adjust one or more of the
motor drive
parameters of the first motor drive profile to move the latch member to the
unlocked
orientation. Also, the first motor drive profile may include a speed profile,
wherein the
PCB is further configured to vary at least one of a period, a duration, a
shape, and/or a
sequence of the speed profile when the actuator is moving the latch member
between
the locked and unlocked orientations.
In yet another aspect, a method of actuating a latch member between a locked
orientation to secure a door panel to a cabinet housing and an unlocked
orientation to
free the door panel from the cabinet housing is provided. An electromechanical
component includes a printed circuit board (PCB) and an actuator, wherein the
actuator
is operably coupled to a drive member, and the drive member is coupled to the
latch
member. The method comprises the steps of: receiving a control signal to move
the
latch member between the locked orientation and the unlocked orientation;
sensing an
ambient temperature associated with the latch member; determining if the
sensed
ambient temperature is below a predetermined threshold temperature; and if it
is
determined that the sensed ambient temperature is below the predetermined
threshold
temperature, directing a pulsed current signal to the actuator to move the
latch member
between the locked orientation and the unlocked orientation.
Numerous applications, some of which are exemplarily described below, may be
implemented using the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described, by way of example, with reference
to the accompanying drawings, in which:
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Date Recue/Date Received 2023-03-28
FIG. 1 is an environmental view of a traffic signal control box suitable for
use with
an embodiment of a cabinet lock in accordance with the present invention;
FIG. 2 is an expanded view of a handle and cabinet lock mounted on the traffic
signal control box shown in FIG. 1;
FIG. 3 is an expanded view of a latch member and vertical rod latching device
used within the traffic signal control box shown in FIG. 1;
FIG. 4 is a perspective view of a prior art cabinet lock;
FIG. 5 is a perspective view of an embodiment of a cabinet lock in accordance
with the present invention;
FIG. 6 is a perspective view of the cabinet lock shown in FIG. 5 with the
latch
housing removed;
FIG. 7 is a top view of the cabinet lock shown in FIG. 6 with the
electromechanical component housing removed;
FIG. 8 is a top view of the cabinet lock shown in FIG. 7 with the manual
actuator
and actuator/motor removed, and with the drive screw and dead bolt in the
locked
orientation;
FIG. 9 is a top view of the cabinet lock shown in FIG. 8 with the drive screw
and
dead bolt in the unlocked orientation;
FIG. 10 is a perspective expanded view of a printed circuit board, actuator
and
drive screw used within the cabinet lock shown in FIG. 5, with the drive screw
in the
locked orientation;
FIG. 11 is a top view of the cabinet lock shown in FIG. 8 with the drive screw
and
dead bolt intermediate the locked orientation and the unlocked orientation;
FIG. 12 is a perspective expanded view of the printed circuit board, actuator
and
drive screw within the cabinet lock shown in FIG. 11;
FIG. 13 is a front perspective view of yet alternative embodiment of a cabinet
lock in accordance with the present invention;
FIG. 14 is a rear perspective view of the alternative embodiment of a cabinet
lock
shown in FIG. 13 with the electromechanical component housing removed;
FIG. 15 is a rear of the alternative embodiment of a cabinet lock shown in
FIG.
13;
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Date Recue/Date Received 2023-03-28
FIG. 16 is a rear view of the alternative embodiment of a cabinet lock shown
in
FIG. 15 with the manual actuator and actuator/motor removed;
FIG. 17 is a rear view of the alternative embodiment of a cabinet lock shown
in
FIG. 13 showing the latch in a locked orientation;
FIG. 18 is a rear view of the alternative embodiment of a cabinet lock shown
in
FIG. 13 showing the latch in an intermediate orientation;
FIG. 19 is a rear view of the alternative embodiment of a cabinet lock shown
in
FIG. 13 showing the latch in an unlocked orientation;
FIG. 20 is an exploded view of another embodiment of a cabinet lock in
.. accordance with the present invention;
FIG. 21 is a top perspective view of the alternative embodiment of a cabinet
lock
shown in FIG. 20 with the latch housing cover plate removed;
FIG. 22 is an isolated view of the latch member and drive member of the
alternative embodiment of a cabinet lock shown in FIG. 20;
FIG. 23 is an expanded view of the drive member and photo beam interrupter
shown in FIG. 22;
FIG. 24 is a plot showing IR signal strength as a function of drive member
position for an exemplary drive member and photo beam interrupter in
accordance with
an aspect of the present invention;
FIG. 25 is a flow chart of a method for powering an actuator of a cabinet lock
based on a sensed temperature in accordance with an aspect of the present
invention;
FIG. 26 is an exemplary diagram illustrating how a motor drive profile for
powering the actuator can be controlled and/or individual drive parameters can
be
dynamically adjusted;
FIG. 27 is a flow chart of a method for selecting from different motor drive
profiles
and/or dynamically adjusting individual drive parameters according to a sensed
temperature in accordance with another aspect of the present invention;
FIG. 28 is a diagram illustrating various examples of how a motor drive
pattern
including multiple drive profiles for powering the actuator can be controlled
over time for
different temperatures; and
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Date Recue/Date Received 2023-03-28
FIG. 29 is a flow chart of a method for controlling motor drive patterns
including
multiple different motor drive profiles over time based on a sensed
temperature in
accordance with yet another aspect of the present invention.
Corresponding reference characters indicate corresponding parts throughout the
__ several views. The exemplifications set out herein illustrate currently
preferred
embodiments of the present invention, and such exemplifications are not to be
construed as limiting the scope of the invention in any manner.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1-4, a traffic signal control box 10 generally includes a
cabinet
housing 12 defining an open interior. Mounted within the interior are the
control boards
and related systems and circuitry to control and coordinate traffic lights to
manage traffic
flow and ease or eliminate traffic congestion. Control box 10 may be powered
by the
grid and may be enabled for wired or wireless communication with a municipal
traffic
control agency.
A door panel 14 is mounted to cabinet housing 12 and is configured to cover
the
interior opening when in a closed condition, such as that shown in FIG. 1. In
one aspect
of the invention, door panel 14 is pivotally mounted to cabinet housing 12
using one or
more hinges (not shown) as is generally known in the art. A handle 16 may be
included
to aid in pivoting door panel 14 from the closed condition to an open
condition wherein
access to the cabinet interior and equipment therein is gained. Handle 16 may
be
further coupled to a vertical rod latching device 18 configured to hold door
panel 14 in
the closed condition (FIG. 3). Handle 16 may be turned to disengage rods 20
from the
cabinet housing (compare FIG. 1 having handle 16 in vertical, engaged
position, and
FIG. 2 having handle 16 turned to a rotated, disengaged position). To prevent
unauthorized access to the control box interior and the equipment contained
therein,
cabinet housing 12 and/or door panel 14 may be provided with a cabinet lock.
With reference to FIG. 4, a prior art cabinet lock 22' may include a latching
component 24' having a latch member 30', such as a deadlatch 30a', which is
configured to engage handle 16 and/or vertical rod latching device 18 so as to
prevent
turning of the handle 16 when the latch member 30' is in a locked orientation.
Cabinet
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Date Recue/Date Received 2023-03-28
lock 22' includes a key switch 34' whereby, upon insertion of the proper key,
key switch
34' may operate to withdraw latch member 30' and disengage latch member 30'
from
handle 16/ vertical rod latching device 18 such that handle 16 may be turned
and door
panel 14 may be pivoted as described above. As discussed above, while latch
member
30' may minimize unauthorized access to control box 10, access may still occur
through
manipulation of the latch member, or through unauthorized use of the proper
key.
Turning now to FIGS. 5-12, shown is an embodiment of a cabinet lock 22 in
accordance with an aspect of the present invention. Cabinet lock 22 is
generally
comprised of a latching component 24 and electromechanical component 26.
Latching
component 24 includes a latch housing 28 and a latch member 30 reciprocally
translatable therein. Latch member 30 may translate from a locked orientation,
such as
that shown in FIGS. 5-8, to an unlocked orientation, such as that shown in
FIG. 9, as
will be discussed in greater detail below. Without limitation thereto, latch
member 30
may be a deadbolt or beveled latch or other suitable feature.
Latching component 24 may further include a manual actuator 32, such as a key
switch 34. Key switch 34 may include a cylinder 36 having a first end 38 which
is
configured to receive a key therein. First end 38 may extend outwardly of door
panel 14
through an aperture 40 (see e.g., FIG. 2). The opposing second end 42 of
cylinder 36
may include a cam member 44. Cam member 44 may further carry a lug 46. Lug 46
is
configured to engage latch member 30, such as at wing 48 of latch member 30 as
seen
in FIG. 6. Turning of a key within cylinder 36 causes cam member 44 and lug 46
to
rotate against wing 48, such as in the direction generally indicated by arrow
50, which
then drives wing 48 and latch member 30 in an unlocking direction generally
indicated
by arrow 52. As latch member 30 travels in the unlocking direction, a biasing
member
54, such as a spring, is compressed to thereby store potential energy within
the spring.
Once the turning force applied to the key is removed, the potential energy
within spring
54 is released thereby, driving latch member 30 in a locking direction
generally
indicated by arrow 56. Wing 48 likewise reverse rotates cam member 44
returning
cylinder 36 to its initial position as shown in FIG. 6.
In addition to, or as an alternative to, manual actuator 32, cabinet lock 22
also
includes electromechanical component 26 configured to selectively translate
latch
Date Recue/Date Received 2023-03-28
member 30. With reference to FIGS. 7 and 8, electromechanical component 26
generally comprises an actuator 58 operably coupled to a drive member 60.
Drive
member 60 may be a threaded rod 68, such as a motor, as shown. First end 62 of
drive
member 60 is coupled to latch member 30 whereby powering of actuator 58
retracts
drive member 60 and causes latch member 30 to be retracted within latch
housing 28 to
the unlocked orientation (FIG. 9).
By way of example and without limitation thereto, latch member 30, such as
prior
art latch member 24' (FIGS. 3 and 4), may be retrofitted with
electromechanical
component 26 whereby a connecting feature 61 fixedly couples drive member 60
to
latch member 30. In the case of the embodiment shown in FIG. 7, connecting
feature
61 includes yoke portion 62a of drive member 60 and housing end 64 of latch
member
30 connected together via fastener 66. Fastener 66 may be any suitable
fastening
device, such as but not limited to a pin, screw, bolt, rivet or the like. As
such, translation
of drive member 60 will translate latch member 30.
In accordance with an aspect of the invention, and in reference to the
embodiment shown in FIGS. 5-12, drive member 60 may comprise threaded rod 68
and
drive nut 70 rotatably mounted thereon. Drive nut 70 may be rotated by
powering of
actuator 58 such that rotation (but not translation) of drive nut 70 causes
threaded rod
68 to translate (but not rotate) laterally along longitudinal axis A of
threaded rod 68. In
accordance with an aspect of the present invention, actuator 58 may be powered
in a
first direction to cause threaded rod 68 and latch member 30 to translate to
the
unlocked orientation (FIG. 9), and powered in the opposing second direction to
cause
threaded rod 68 and latch member 30 to return to the locked orientation (FIGS.
7 and
8).
Additionally, or alternatively, biasing member 54 may urge latch member 30 to
the locked orientation once power to actuator 58 is removed. By way of
example,
actuator 58 may be a motor provided with a relatively high current, such as
and without
limitation thereto, about 250 mA at 24 volts DC, to retract latch member 30 to
the
unlocked orientation. Once latch member 30 has moved to unlocked orientation
(FIG.
9), a hold current of approximately 50 mA may retain latch member 30 in the
unlocked
orientation. Removing the hold current may allow spring 54 to return latch
member 30
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Date Recue/Date Received 2023-03-28
to the locked orientation as described above. Alternatively, an opposing
current may be
provided to actuator 58 to reverse rotate drive nut 70 and reverse translate
threaded rod
68.
With reference to FIG. 10, electromechanical component 26 may further include
a printed circuit board (PCB) 72. PCB 72 may be configured to receive and send
instructions and information with one or more control boards within traffic
signal control
box 10, which in turn may receive and send information with a municipal
traffic control
agency. Additionally or alternatively, PCB 72 may include a communication
module 74,
such as a Bluetooth or other wireless communication module, configured for
direct
communication with a remote traffic control agency. PCB 72 may send control
signals
to power actuator 58 and may also send information regarding lock status as
will be
described in greater detail below. Still further, communication module 74 may
be
configured to receive control signals from a utilities worker located onsite
through a
wireless communication signal, thereby foregoing the need for a physical key
for use
with cylinder 36.
In accordance with the invention, a latch position sensor may be provided to
enable remote detection of the latch status of cabinet housing 12. Referring
once again
to the embodiment shown in FIGS. 7-12, PCB 72 may include a forward surface 76
and
a rearward surface 78. An aperture 80 may pass through PCB 72 from forward
surface
76 to rearward surface 78. Located proximate aperture 80 on rearward surface
78 may
be a drive member position sensor 82. In one aspect of the invention, position
sensor
82 may comprise a photoemitter/detector pair 82a, 82b configured for line-of-
sight
detection. For example, photoem der 82a may emit a beam of light which is
detected by
detector 82b. Position sensor 82 will then trigger a signal when the beam of
light is
interrupted/blocked, as will be discussed in greater detail below. Still
further, the
photoemitter may be an optical infrared emitter, although other position
sensors may be
used, such as and without limitation thereto, a Hall Effect sensor, a linear
variable
differential transformer or rotary encoder.
Working in conjunction with photo emitter/detector pair 82a,82b, is a photo
beam
interrupter 90a, 90b conjured to move with movement of latch member 30 and to
selective block and unblock the energy beam between photo emitter a and photo
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Date Recue/Date Received 2023-03-28
detector 82b. In the case of the embodiment shown in FIGS. 8-12, photo beam
interrupter 90a, 90b includes terminal end 84 (90a) of drive member 60 and
aperture 86
(90b). As shown in FIG. 10, drive member 60 is coaxially aligned with aperture
80, with
terminal end 84 of drive member 60 located near or even with the plane defined
by
forward surface 76 while latch member 30 is in the locked orientation. In no
event will
terminal end 84 extend completely through aperture 80 and beyond the plane
defined
by rearward surface 78 while latch member 30 is in the locked orientation.
Turning now to FIGS. 11 and 12, latch member 30 is shown in an intermediate
state between the locked orientation (FIGS. 7 and 8) and the unlocked
orientation (FIG.
9), such as through a partial turning of the key within cylinder 36 or
supplying of a high
retract current to actuator 58. In either event, drive member 60 translates
laterally while
drive nut 70 is rotated as described above. As a result, terminal end 84 of
drive
member 60 (i.e., interrupter 90a) travels in and through aperture 80 within
PCB 72.
Drive member 60 then interrupts the line-of-sight beam of position sensor 82
thereby
causing position sensor 82 to trigger a signal. This signal is then,
ultimately,
communicated to the municipal traffic control agency and/or utility employee
signaling
that latch member 30 is being translated from the locked orientation to the
unlocked
orientation. Thus, the municipal traffic control agency can verify whether an
attempted
access to traffic signal control box 10 is authorized or not. Should the
attempt be
unauthorized, additional safety measures may be taken, such as alerting local
law
enforcement or triggering video and/or audio data collection to assist in
identifying the
unauthorized individual.
There may be a further need to detect and signal when latch member 30 has
reached its fully retracted position. For this purpose aperture 86 passing
through drive
member 60 may be formed at a distance from terminal end 84 of the drive member
(see
FIGS. 8 and 9). As drive member 60 continues its translation from the locked
orientation and reaches the unlocked orientation, aperture 86 aligns with the
line-of-
sight beam of position sensor 82. In doing so, the line-of-sight beam
transmitted by
photoemitter 82a is again allowed to pass through aperture 86 (interrupter
90b) and
reach detector 82b. A signal created upon renewed receipt of the beam by
detector 82b
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Date Recue/Date Received 2023-03-28
may be communicated to the municipal traffic control agency that latch member
30 is in
its unlocked orientation and that the interior of control box 10 has become
accessible.
Thus, the above described embodiments for remotely detecting latch status
provides means by which the municipal traffic control agency may verify
whether an
attempted access to traffic control box 10 is authorized or not. Should the
attempt be
unauthorized, additional safety measures may be taken, such as alerting local
law
enforcement or triggering video and/or audio data collection to assist in
identifying the
unauthorized individual.
Moreover, by using an optical sensor or photo-emitter sensor for position
sensor
82 as described above, the sensing device would be impervious to expected
temperature extremes and electromagnetic interferences.
Turning now to FIGS. 13-19, an alternative embodiment of a cabinet lock 222
may generally comprise a latching component 224 and electromechanical
component
226. Similar to latching components 24 described above, latching component 224
includes a latch housing 228 and a latch member 230 reciprocally translatable
therein
between a locked orientation (FIGS. 13-17) and an unlocked orientation (FIG.
19).
Without limitation thereto, latch member 230 may be a deadbolt or beveled
latch or
other suitable feature. Latching component 224 may further include a manual
actuator
232, such as a key switch 234 described above with regard to key switch 34,
the
operation of which is identical as recited previously. Electromechanical
component 226
is configured to selectively translate latch member 230.
Electromechanical component 226 generally includes an actuator 258 operably
coupled to a drive member 260; actuator 258 may be a rotary actuator 268.
Drive
member 260 may be drive plate 270. Drive member 260 includes a guide channel
288
configured to receive a latch pin 294 on latch member 230 which extends from
latch
housing 228 into drive housing 292.
With additional reference to FIGS. 13-19, drive member 260 is configured to
engage latch pin 294 such that rotation of drive plate 270 via actuator 258
causes
translation of latch pin 294, and subsequent translation of latch member 230.
Actuator
258 may be powered in a first direction to cause drive member 260 and latch
pin 294 to
translate latch member 230 from a locked orientation (FIG. 17) through an
intermediate
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Date Recue/Date Received 2023-03-28
orientation (FIG. 18) to the unlocked orientation (FIG. 19). Powering of
actuator 258 in
the opposing second direction may cause drive member 270, latch pin 294 and
latch
member 230 to return to their respective locked orientations (FIG. 17).
Additionally, or
alternatively, biasing member 254, such as a spring, within latch housing 228
may urge
latch member 230 to the locked orientation once power to actuator 258 is
removed.
In accordance with an aspect of the present invention, electromechanical
component 226 may be configured to retrofit an existing cabinet lock, such as
cabinet
lock 22' including latch member 30' and key switch 34' as described above with
regard
to FIG. 4, whereby a connecting feature 261 fixedly couples electromechanical
component 226 to latching component 224. In the case of the embodiment shown
in
FIG. 15, connecting feature 261 may include guide channel 288 of drive member
260
and latch pin 294 connected to latch member 230 (FIG. 15).
Electromechanical component 226 may also be configured with a latch position
sensor using a photo emitter/detector pair as described above. In the case of
the
embodiment shown in FIGS. 17-19, photo beam interrupter may include a surface
290a
of drive member 260 to block transmission of the line-of-sight beam
transmitted by
photo emitter when the latch is in a first position (FIG. 18), and a through
orifice 290b in
drive member 260 strategically placed to allow transmission of the line-of-
sight beam to
the photo detector when the latch moves to a second position. For example, the
first
position of the latch may be when the latch is an intermediate latch position
(FIG. 18)
and the second position may be when the latch is fully retracted (FIG. 19) to
allow entry
into control box 10.
Turning now to FIGS. 20-23, another alternative embodiment of a cabinet lock
422 may generally comprise a latching component 424 and electromechanical
component 426. Similar to latching component 24 described above, latching
component 424 includes a latch housing 428 and a latch member 430 reciprocally
translatable therein between a locked orientation and an unlocked orientation.
Without
limitation thereto, latch member 430 may be a deadbolt or beveled latch or
other
suitable feature. Latching component 424 may further include a manual actuator
432,
including a key switch 434 described above with regard to key switch 34, the
operation
Date Recue/Date Received 2023-03-28
of which is identical as recited previously. Electromechanical component 426
is
configured to selectively translate latch member 430.
With reference to FIGS. 20-22, electromechanical component 426 generally
comprises an actuator 458, operably coupled to a drive member 460. Drive
member
460 may include a threaded rod 468, as shown. First end 462 of drive member
460 is
coupled to latch member 430 whereby powering of actuator 458 retracts drive
member
460 and causes latch member 430 to be retracted within latch housing 428 to
the
unlocked orientation.
In accordance with an aspect of the invention, biasing member 454 may urge
latch member 430 to the locked orientation once power to actuator 458 is
removed. By
way of example, actuator 458 may be a motor provided with a relatively high
current,
such as and without limitation thereto, about 250 mA at 24 volts DC, to
retract latch
member 430 to the unlocked orientation. Once latch member 430 has moved to
unlocked orientation, a hold current of approximately 50 mA may retain latch
member
430 in the unlocked orientation. Removing the hold current may allow spring
454 to
return latch member 430 to the locked orientation as described above.
Alternatively, an
opposing current may be provided to actuator 458 to reverse translate threaded
rod
468.
With reference to FIGS. 20 and 21, electromechanical component 426 may
further include a printed circuit board (PCB) 472. PCB 472 may be configured
to
receive and send instructions and information with one or more control boards
within
traffic signal control box 10, which in turn may receive and send information
with a
municipal traffic control agency. Additionally or alternatively, PCB 472 may
include a
communication module 474, such as a Bluetooth or other wireless communication
module, configured for direct communication with a remote traffic control
agency. PCB
472 may send control signals to power actuator 458 and may also send
information
regarding lock status as will be described in greater detail below. Still
further,
communication module 474 may be configured to receive control signals from a
utilities
worker located onsite through a wireless communication signal, thereby
foregoing the
need for a physical key for use with, for example, cylinder 36.
16
Date Recue/Date Received 2023-03-28
In accordance with the invention, a latch position sensor may be provided to
enable remote detection of the latch status of cabinet housing 12. With
continued
reference to FIGS. 20 and 21, PCB 472 may include a forward surface 476 and a
rearward surface 478. An aperture 480 may pass through PCB 472 from forward
surface 476 to rearward surface 478. Located proximate aperture 480 on
rearward
surface 478 may be a drive member position sensor 482. In one aspect of the
invention, position sensor 482 may comprise a photo emitter/detector pair
482a, 482b
configured for line-of-sight detection. For example, photo emitter 482a may
emit a
beam of light (such as but not limited to visible and/or infrared (IR)
radiation, i.e., an
optical infrared emitter) which is detected by detector 482b. Position sensor
482 will
then trigger a signal when the beam of light is interrupted/blocked, as will
be discussed
in greater detail below. It should be further noted that other position
sensors may be
used, such as and without limitation thereto, a Hall Effect sensor, a linear
variable
differential transformer or rotary encoder.
With further reference to FIGS. 22 and 23, working in conjunction with photo
emitter/detector pair 482a, 482b, is a photo beam interrupter 490 configured
to move
with movement of latch member 430 and to selectively intercept the beam of
light
between photo emitter 482a and photo detector 482b. In the case of the
embodiment
shown in FIGS. 20-23, photo beam interrupter 490 may be coupled to or
otherwise
includes terminal end 484 of drive member 460. As shown in FIGS. 20-22, drive
member 460 is coaxially aligned with aperture 480, with terminal end 484 of
drive
member 460 located near or even with the plane defined by forward surface 476
while
latch member 430 is in the locked orientation. In one aspect of the present
invention,
drive member 460 may be received within guide sleeve 486 which may extend from
rear
wall 428a of latch housing 428 to an intermediate distance within housing 458a
of
actuator 458.
In accordance with an aspect of the present invention, guide sleeve 486 is
constructed of a material configured to be transparent to the radiation
emitted by photo
emitter 482a. As a result, photo detector 482b detects an unhindered light
beam when
latch member 430 is in a locked orientation which manifests as a first signal
that may be
communicated to the municipal traffic control agency and/or utility employee.
Photo
17
Date Recue/Date Received 2023-03-28
beam interrupter 490 may then be fabricated from a translucent material
whereby photo
detector 482b detects a modified light beam which manifests as a second signal
communicated to the municipal traffic control agency and/or utility employee.
Drive
member 460 may then be fabricated from an opaque material which manifests as a
third
signal communicated to the municipal traffic control agency and/or utility
employee.
With additional reference to FIG. 24, in one aspect of the invention, the
first
signal 492 may indicate that latch 430 is in the locked orientation while the
third signal
494 indicates that latch 430 is in the unlatched orientation. Photo beam
interrupter 490
(and its resultant modified light beam) may then be selected to have a length
whereby
the second signal 493 indicates that latch member 430 has been moved from its
fully
latched orientation to a position prior to its unlatched orientation. As the
second signal
493 is communicated to the municipal traffic control agency, the municipal
traffic control
agency can verify whether an attempted access to traffic signal control box 10
is
authorized or not. Should the attempt be unauthorized, additional safety
measures may
be taken, such as alerting local law enforcement or triggering video and/or
audio data
collection to assist in identifying the unauthorized individual and/or
initiating a lock-out
protocol whereby further movement of latch 430 is arrested and admission to
traffic
control box 10 is prevented.
It should be noted that, while photo beam interrupter 490 has been shown and
described as being fabricated from a single material having a consistent
translucency, in
a further aspect of the present invention, photo beam interrupter 490 may
alternatively
be formed so as to define a plurality of stratified sub-regions wherein each
sub-region
has a different degree of translucency. Thus, second signal 493 may be
delineated into
a series of smaller signals, whereby photo detector 482b may sequentially emit
each
signal to communicate to serial movement of latch member 430 to the municipal
traffic
control agency.
In cold climates, latch member movement between locked and unlocked
orientations is known to become sluggish or, under extreme temperature
conditions,
inoperative. With reference to FIGS. 25-29, sluggish or inoperative latch
member 30,
230, 430 movement caused by these conditions may be remedied by directing an
instantaneous, pulsed current signal to actuator 32, 232, 432 to advance latch
member
18
Date Recue/Date Received 2023-03-28
30, 230, 430. With respect to cabinet locks 22, 222 and 422, a further
embodiment may
include a temperature sensor 94 for sensing ambient temperatures within
respective
latch housing 28, 228 and 428. Temperature sensor 94, may be located on the
PCB
72, 472 (see FIG. 12 for example) or anywhere within or near latch housing 28,
228,
428. Accordingly, as shown in FIG. 25, an exemplary method 500 for powering an
actuator of a cabinet lock based on a sensed temperature is provided. For
instance,
PCB 72, 472 monitors an ambient temperature associated with or in the vicinity
of
cabinet lock 22, 222, 422 using temperature sensor 94 at step 5510. Upon
detection of
a temperature above or below a predetermined threshold temperature by sensor
94 at
step 5520, and further upon receipt of communication by PCB 72, 472 to retract
latch
member 30, 230, 430 to an unlocked orientation from the remote traffic control
agency
or local utilities worker at step 5530, a pulsed current signal may be
directed to actuator
32, 232, 432 by PCB 72, 472 to advance movement of latch member 30, 230, 430
to
the unlocked orientation at step 5540. For each period of a given unlocking
cycle, PCB
72, 472 may further detect whether latch member 30, 230, 430 is fully
retracted to the
unlocked orientation at step 5550 using position sensor 482, for example. If
latch
member 30, 230, 430 is not detected as being in the unlocked orientation,
method 500
may return to 5540 and continue directing a pulsed current signal to actuator
32, 232,
432 in an attempt to move latch member 30, 230, 430 to the unlocked
orientation. If
PCB 72, 472 detects that latch member 30, 230, 430 has reached the unlocked
orientation, method 500 may end or cycle back to step 5510.
Although not illustrated in FIG 25, it should be appreciated that in the event
the
sensed temperature is not above or below the predetermined threshold
temperature
value (e.g., the ambient temperature is within a nominal or normal operating
range),
directing of a pulsed current signal and/or adjustment of motor drive
parameters may
not be needed to advance movement of latch member 30, 230, 430, and thus PCB
472
will ordinarily drive actuator 32, 232, 432 according to regular current
signal and/or a set
of standard or default motor drive parameters upon receiving a command to
retract latch
member30, 230, 430.
In accordance with another aspect, FIGS. 26 and 27 illustrate a diagram and
flow
chart for an exemplary method 600 in which PCB 72, 472 is configured to either
provide
19
Date Recue/Date Received 2023-03-28
a motor drive profile, select a motor drive profile from a plurality of
available motor drive
profiles, or dynamically create a motor drive profile in real-time to drive
actuator 32, 232,
432 (e.g., stepper motor) when the sensed temperature value falls below a
predetermined temperature threshold. For example, PCB 72, 472 may include an
onboard control microcontroller (MCU) that is configured to drive a stepper
motor, and
continually monitor ambient temperature of in the vicinity of or within
cabinet lock 22,
222, 422 at a configurable interval using temperature sensor 94 at step S610.
At step
S620, PCB 72, 472 (via control MCU) is configured to drive the stepper motor
using a
selected motor drive profile to provide optimal retraction forces based on the
sensed
temperature.
As best seen in FIG. 26, the motor drive profile over a given time period may
be
manifested in the form of a pulsed current signal directed to actuator 32,
232, 432 that
comprises of one or more of a current profile that reflects the amount of
current that is
provided to the actuator 32, 232, 432 (e.g., stepper motor coil(s)), a speed
profile that
reflects the linear or rotational speed (e.g., steps/second) of a shaft of the
actuator,
and/or a drive frequency profile that represents the pulse frequency (i.e.,
STCK
frequency (kHz)) that is provided to the actuator being imposed at a selected
stepping
modes (e.g., 1/256th, 1/32nd, 1/8th, full step). It should be understood that
the motor
drive profile shown in FIG. 26 is merely exemplary, and the components that
make up
the motor drive profile may be dynamically adjusted depending on the sensed
temperature and/or the detected position of latch member 30, 230, 430 during
the
process of moving latch member 30, 230, 430 between unlocked and locked
orientations. It should also be understood that one or more motor drive
parameters that
are controlled in the motor drive profile may be adjusted to change the
characteristics of
the motor drive profile, to provide for the plurality of different motor drive
profiles, or to
dynamically adjust the motor drive profile during the movement of latch member
30,
230, 430 between unlocked and locked orientations. The motor drive parameters
may
include, but are not limited to, the following:
= Acceleration rate (pulses per second squared, pp52),
= Deceleration rate (pp52),
= Maximum speed (pps),
Date Recue/Date Received 2023-03-28
= Minimum speed (pps),
= Acceleration motor torque current (% of full-scale current defined by
hardware (%FS)),
= Deceleration motor torque current (%FS),
= Run speed motor torque current (%FS),
= Motor holding torque current (%FS), and
= Stepping modes (full-wave, half-wave, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128,
1/256).
By selectively adjusting the above-referenced motor drive parameters, PCB 72,
472 (onboard motor control MCU) is able to construct different speed profiles
(FIG. 28),
having different shapes such as trapezoidal and triangular, for example. In
some
example embodiments, PCB 72, 472 may be programmed in advance with (or may
store and update) a mapping of different temperature values or temperature
range to
different corresponding motor drive profiles. For example, there may be a
normal
weather operating range of temperatures, a cold weather operating range
defined below
a first threshold temperature value, and a hot weather operating range defined
above a
second threshold value. The cold weather operating range could also be further
subdivided by one or more additional threshold temperature values or ranges
(e.g., to
define an extreme cold weather operating range), and so on as needed depending
on
the implementation. In some other example embodiments, PCB 72, 472 may also be
configured to adjust individual motor drive parameters of a given motor drive
profile at
any time (e.g., before, during, or after an unlocking cycle) to allow for
optimal retraction
of latch member 30, 230, 430 despite any changes in temperature.
Then when PCB 72, 472 receives a communication to retract latch member 30,
230, 430 from a remote device at step S630, PCB 72, 472 can drive actuator 32,
232,
432 according to the selected motor drive profile having optimal retraction
forces for
advancing latch member 30, 230, 430 under conditions associated with the
sensed
ambient temperature at step S640. PCB 72, 472 may further detect whether latch
member 30, 230, 430 is fully retracted at step S650 using position sensor 482,
and will
then either return to step S640 and continue driving actuator 32, 232, 432
according to
the selected motor drive profile, otherwise method 600 can either return to
step S610 so
21
Date Recue/Date Received 2023-03-28
that temperature monitoring can continue for subsequent cycles of operating
the locking
mechanism, or end once PCB 72, 472 detects that latch member 30, 230, 430 has
reached the unlocked orientation. Optionally, when returning to step S640
after a "No"
determination at step S650, PCB 72, 472 (via MCU) may also dynamically adjust
one or
more of the motor drive parameters of the selected motor drive profile at step
S660
during a given unlocking cycle. Additionally or alternatively, PCB 72, 472
could also
select a different motor drive profile at step S660 for the next period of the
unlocking
cycle in a similar manner.
In accordance with a further aspect, FIGS. 28 and 29 illustrate an exemplary
diagram and flow chart for a method 700 in which PCB 72, 472 (onboard motor
control
MCU) can also adjustably control motor drive patterns over time based on
sensed
temperature. It should be understood that a motor drive "pattern" may consist
of a
plurality of motor drive "profiles" (e.g., pattern_1 = profile_1 + profile_2 +
profile_3 +
profile_N) that may each have different drive "parameters" (e.g., profile_1 =
parameter_1 + parameter_2 + parameter_3 + parameter_N), respectively. For
example, in FIG. 28, varying speed profiles are illustrated as a function of
time as an
actuator is moving the latch member between locked and unlocked orientations.
Similar
to method 600 described above with reference to FIGS. 26 and 27, in method 700
the
PCB 72. 472 continually senses the ambient temperature at a configurable
interval of
time via temperature sensor 94 at step S710, and provides or selects a motor
drive
profile and/or dynamically adjusts one or more drive parameters of a provided
or
selected motor drive profile for driving actuator 32, 232, 432 based on the
sensed
temperature at step S740. In addition, PCB 72, 472 (via onboard MCU) also has
the
ability to control motor drive patterns, such as by varying the period,
duration, shape,
and/or sequence of individual motor drive profiles (e.g., the trapezoidal or
triangular
speed profiles) at different temperatures over time, which allows for latch
member 30,
230, 430 to overcome any additional mechanical forces exerted on the locking
mechanism that result from changes in temperature and related external
conditions at
step S760. Thus, PCB 72, 472 can utilize sensors and programming of an onboard
motor control MCU to ensure proper operation when unlocking latch member 30,
230,
430 by providing the ability to adapt motor drive parameters, motor drive
profiles, and/or
22
Date Recue/Date Received 2023-03-28
motor drive patterns to seasonal, weather-based, or other extreme temperature
variations.
While the above-referenced discussion relates to providing a motor drive
profile
and/or dynamically adjusting one or more motor drive parameters to drive
actuator 32,
232, 432 when the sensed temperature value falls below a predetermined
temperature
threshold, it should be understood that the above-referenced methods can also
be
adapted for situations where the sensed temperature value falls above a
predetermined
temperature threshold. If should also be understood that the above-referenced
methods may be implemented using hardware, software stored in a memory of PCB
that is executable by a processor, or a combination thereof.
In a further aspect of the present invention, cabinet lock 422 may be
configured
to mount within a traffic signal control box 10, as described above. As such,
cabinet
lock 422 may be exposed to atmospheric conditions, such as weather events
(extreme
heat, cold, rain or snow), as well as ambient temperature and humidity (and
daily/seasonal changes thereof). To prevent, or minimize ingress of moisture
(i.e. rain
or snow) into latch housing 428 may include a gasket 496 between latch housing
body
428' and latch housing cover plate 428". Moreover, should moisture enter latch
housing
428 or condensation be produced within latch housing 428, bottom wall 428b of
latch
housing 428 may include one or more weep holes 498 designed to enable drainage
of
any such moisture from within latch housing 428.
In accordance with another aspect of the invention, a method is provided for
retrofitting electromechanical component 26, 226, 426 to an existing cabinet
lock having
only a latching component 24', the method including the steps of:
1. providing a cabinet lock having a latching component 24' wherein the
latching
component 24' includes a latch member 30, 230,430;
2. providing an electromechanical component 26, 226, 426 including a
respective
actuator 32, 232, 432 connectable to a power source; wherein the
electromechanical
component 26, 226, 426 further includes a respective drive member 60, 260,
460; and
3. coupling said respective drive member 60, 260, 460, to said latch member
30,
230, 430 with connecting feature 61, 261, 461.
23
Date Recue/Date Received 2023-03-28
The electromechanical component 26, 226, 426 may further include a position
sensor 482 for sensing the position of latch member 30, 230, 430 wherein the
method
further includes triggering of a signal by the position sensor that latch
member is being
translated from a locked orientation to an unlocked orientation, and/or a
signal that said
latch member has reached said unlocked orientation.
The electromechanical component 26, 226, 426 may further include a
temperature sensor 94 for sensing the ambient temperature associated with the
latching
component 24' wherein the method further includes triggering of a signal by
the
temperature sensor that the temperature is below (or above) a predetermined
threshold
.. temperature value.
While the invention has been described by reference to various specific
embodiments, it should be understood that numerous changes may be made within
the
spirit and scope of the inventive concepts described. Accordingly, it is
intended that the
invention not be limited to the described embodiments, but will have full
scope defined
by the language of the following claims.
24
Date Recue/Date Received 2023-03-28
