Note: Descriptions are shown in the official language in which they were submitted.
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WINDOW LOCX
DESCRIPTION
Field of the Invention
This invention pertains to a window lock
and, more particularly, to a window lock which
provides for multi-point sequential locking of a
window sash to a window frame. Additionally, the
window lock provides for improved locking at each of
the locking points.
Backqround of the Invention
Movable windows in general use have sash
which are either sliding, double hung or pivotal,
with the latter type including awning and casement
windows. Many different forms of window locks are
available for locking a movable window.
The assignee of the invention disclosed
herein markets window locks for such movable windows.
In many instances, the window can be of such size or
of a structural material which renders it desirable
to have multi-point locking. It is known to mount
individual window locks at spaced points or locations
on the window to achieve multi-point locking.
Typically, each of the window locks is independently
operable. However, the movable mechanisms of a pair
of window locks can be connected together for
simultaneous movement from a single handle as shown
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in the Van Klompenburg U.S. Patent No. 4,095,829,
owned by the assignee of this invention.
Multi-point locking is shown in the Van
Benschoten U.S. Patent No. 2,114,645. There are
commercially-available multi-point window lock
structures operable by a single handle.
The foregoing prior art does not disclose
structure ~providing for sequential locking of the
multi-point locking structure to provide for a
delayed lock-up to accommodate racked or warped
windows, nor do such structures have a window lock
constructed to counteract flexibility of the window
structure as may be encountered with a vinyl window.
Summary of the Invention
A primary feature of the invention is to
provide a window lock having improved locking
functions for locking a window sash to a window frame
and, more particularly, to a window lock constructed
to provide for multi-point locking to lock a window
sash to a window frame at spaced locations, with
delayed lock-up of one lock structure relative to the
other to accommodate racked or warped windows and
with the structure also taking into account other
considerations which may arise in locking of a window
having some flexure, such as a vinyl window.
Additional features of the invention relate
to the versatility of the window lock in providing
for simple, selective assembly of components to
achieve the desired number of locking points; the
assurance that the window lock mechanism cannot move
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by any force applied thereto other than by an
operating handle; the sealing of a window lock
housing to the window frame to render the window lock
light, water and airtight; and an arrangement of the
operating mechanism operable by the handle whereby
the handle can have two limit positions wherein, in
one limit position, the handle establishes a locked
condition of the window with the handle close to the
window frame and, in going to the other limit
position, wherein the window is unlocked, the handle
has moved through an arc approaching 180~ wherein
there is limited protrusion of the handle outwardly
of the housing when the window is unlocked.
Accordingly the invention seeks to provide a
new and improved window lock.
Further the invention seeks to
provide a new and improved multi-point window lock
and, more particularly, such a window lock for vinyl
windows.
The invention in one broad aspect provides
a window lock for a ~indow having a window
frame and a movable window sash comprising, a slider
having a cam member, a ramped keeper, and means for
moving the slider in a path extending lengthwise
thereof to cause the cam member to coact with the
ramped keeper in establishing either a locked or
unlocked condition of the window; the improvement
comprising: multi-point locking of the window sash to
the window frame by utilization of at least two of
said ramped keepers and two of said cam members, each
of said ramped keepers having an inclined ramp
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section and a generally planar section, and said
slider having a length of movement along said path
greater than that re~uired to move a cam member along
said ramp section and onto a generally planar section
of a ramped keeper whereby delayed lock-up of one cam
member and associated ramped keeper may be achieved
relative to the other cam member and ramped keeper by
having said ramped keepers at a distance apart
greater than the distance between said cam members
and a planar section of a ramped keeper having a
length greater than said difference in distances.
Still further the invention seeks to
provide a window lock for a window having a window
frame and a movable window sash comprising, a slider
having a cam member, a ramped keeper, and means for
moving the slider in a path extending lengthwise
thereof to cause the cam member to coact with the
ramped keeper in establishing either a locked or
unlocked condition of the window; the improvement
comprising: a housing; a handle rotatably mounted on
said housing for movement between-two limit positions
and operable to move said slider along said path and
said slider and handle having coacting means to
preclude qravity or other outside force from moving
said slider along said path without moving said
handle.
Further still the invention seeks to
provide a window lock for a window having a window
frame and a movable window sash comprising, a slider
having a cam member, a ramped keeper, and means for
\ moving the slider in a path extending lengthwise
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thereof to cause the cam member to coact with the
ramped keeper in establishing either a locked or
unlocked condition of the window: the improvement
comprising: each of said cam member and ramped keeper
being bevelled to resist any separating movement in a
direction normal to said path as a result of
flexibility of the window frame and window sash as
may result due to high loads.
Description of the Drawings
Fig. l is a fragmentary, perspective view
of a window shown in open position and which has the
window lock structure of Figs. 2-7 associated
therewith;
Fig. 2 is a side elevation of the window
lock hardware shown without association with the
window sash and window frame and with the window lock
in unlocked position and being a view generally
similar to that of Fig. 3 and with parts broken away;
Fig. 3 is a view similar to Fig. 2 showing
the window lock hardware in window-locking position
and with the view being taken generally along the
line 3-3 in Fig. 4;
Fig. 4 is a sectional view taken generally
along the line 4-4 in Fig. 3 and showing the
structure in association with the window frame and
window sash;
Fig. 5 is a view similar to Fig. 4 and
taken generally along the line 5-5 in Fig. 3;
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Fig. 6 is a fragmentary diagrammatic view of a part
of the structure as positioned as shown in Fig. 2 and
illustrating a first toggle position;
Fig. 7 is a view similar to Fig. 6 and illustrating a
second toggle position for the structure in window lock
position and as shown in Fig. 3;
Fig. 8 is a fragmentary elevation of the housing;
Fig. 9 isan elevation view of the handle; and
Fig. 10 is a fragmentary, perspective view of a
window shown in closed position also showing the sectional view
lines 4 - 4 and 5 - 5 on which sectional views in Figures 4 and
5 respectively are based.
Description of the Preferred Embodiment
The window lock is shown in association with a window
in Fig. 1 and with the only room-visible part thereof being a
housing 10 and a handle 12.
The window has a window frame, indicated generally at
14, in which the window sash, generally indicated at 16, of a
casement window is pivotally mounted. The mounting of such a
window by hinges is well known in the art as well as use of a
window operator, indicated generally at 18, for moving the
window sash between closed and fully open positions or any
desired position therebetween.
As will be readily recognized, the window lock
can also be used for an awning-type window
wherein the pivotal movement of the window sash would
be generally about a horizontal axis, rather than the
vertical axis of the casement window. The concepts
embodied in the window lock could be utilized with
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other types of movable windows, such as a double hung
window.
The window lock has particular utility with
a vinyl window and an embodiment of a vinyl window is
shown fragmentarily in Figs. 4 and 5. The window
frame 14 has vertical wall sections 20 and 22
suitably integrally interconnected by interconnecting
walls and~with a pair of interconnected vertical
walls 24 and 26 extending at right angles thereto and
with the wall 26 defining a room-facing surface of
the window frame.
The window sash 16 has a vertical exterior
wall 28 with integrally associated walls including a
wall 30 extending normal thereto which defines one of
the walls mounting a vertical face panel 32 which can
be brought closely adjacent to the vertical frame
wall 24 when the window is closed and with a suitable
weather strip 34 assuring a tight seal.
The window lock has a slider 40 movable in
a path extending lengthwise thereof and which mounts
a cam member, in the form of a roller 42. The slider
is movable in said path by its mounting on a
planar part of a bracket 44 which mounts a pair of
shouldered guide rivets 46 and 48 which extend
through the respective slider slots 50 and 52,
respectively, and which enable movement of the slider
from the window unlocked position, shown in Fig. 2,
to the window locked position, shown in Fig. 3.
The bracket 44 has a pair of bracket
flanges 54 and 56 at right angles to the planar part
thereof which can receive a pair of fasteners 58 and
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60, respectively, which thread into a pair of
alignment bosses 62 and 64 extending inwardly from
the housing 10 and which fit into a slot formed in
the walls 24 and 26 of the window frame. The inner
face of the housing 10 extends beyond the perimeter
of the opening in the window frame to abut against
the interior room face of the vertical frame wall 26.
The fasteners 58 and 60 can draw the bracket flanges
54 and 56 against the inner face of the frame wall 24
and the perimeter of the housing 10 against the wall
26 to capture the window frame therebetween. The
perimeter part of the housing which bears against the
wall 26 includes a continuous O-ring groove, parts of
which are shown at 66 and 68 and which receive an
O-ring to effect a light, water and airtight seal
between the housing and the window frame.
The housing 10 rotatably mounts the handle
12 for movement between two limit positions. One of
these limit positions is the window locked position,
as shown in Fig. 3, wherein the handle 12 extends
downwardly and generally parallel to the frame wall
26. The handle can move to its other limit position,
as seen in Fig. 2, which is the window unlocked
position. This movement of the handle is through an
arc approaching 180 whereby the handle, as seen in
Fig. 2, barely extends beyond the housing 10 and,
thus, does not protrude into the room when the window
is open.
The slider 40 and handle 12 have coacting
means whereby rotation of the handle results in
linear movement of the slider along the path
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lengthwise of the slider. This coacting means
comprises a drive link 70 splined to the handle at
its rotation axis and which has a pin 72 which coacts
with a forked section of the slider. This forked
section has a pair of tines 74 and 76 with an
open-ended slot therebetween. With the window lock
in locked condition and with the handle 12 in the
position shown in Fig. 3, the handle can be rotated
in a counterclockwise direction to the position shown
in Fig. 2 and, during this rotation, the pin 72 will
move sequentially inwardly and outwardly of the slot
and in engagement with the tine 76 to move the slider
40 downwardly, as viewed in Figs. 2 and 3. In return
of the handle 12 to the position of Fig. 3, the
handle 12 is rotated clockwise and the pin 72 moves
sequentially inwardly and outwardly of the slot and
coacts with an edge of the tine 74 to raise the
slider, as viewed in Figs. 2 and 3. The planar part
of the bracket 44 has an arcuate cut-out 80 to permit
the free end of the drive link 70 to move between the
positions shown in Figs. 2 and 3.
The ends of the tines 74 and 76 of the
forked section of the slider are bevelled to enable
movement of the drive link 70 to a toggle position in
either of the limit positions of the handle. This is
diagrammatically illustrated in Figs. 6 and 7. With
the handle 12 moving to the window unlocked position
of Fig. 2, the drive pin 72 moves in a
counterclockwise direction, as viewed in Fig. 6, and
the downward arc to a toggle position is permitted by
the bevelled end 82 of the tine 76. The pin
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72 has reached a toggle position wherein, if an
upward force is exerted on the slider 40 as indicated
by the upwardly-directed arrow, the bevelled end 82
of the tine 76 engages the pin 72 and tends to move
the pin toward the right. This movement is prevented
by coaction between the housing and the handle.
This coaction is achieved by structure
shown in Figs. 8 and 9- Fig. 8 shows a side wall 83
of the housing 10 having an opening 84 to receive a
stem 85 (Fig. 9) of the handle 12. A pair of
abutments 86a and 86b are formed on the housing to
define rotatable limit positions for the handle 12 by
coaction with an arcuate rib 87 on the handle. The
rib 87 has an included arc of approximately 104
although not intended to be limiting, and the
abutments 86a and 86b are spaced apart through an
angular distance of approximately 250 whereby the
handle can rotate through an arc of approximately
150.
A similar toggle position is achieved when
the handle 12 is in window locked position. As seen
in Fig. 7, any downward force applied on the slider
40, as represented by the downwardly-directed arrow,
would cause a bevelled end 88 of the tine 74 to
engage the drive pin 72 and urge the drive link 70 in
a clockwise direction, as indicated by the arrow,
which would be prevented by coaction of the handle 12
with the housing 10. The slider 40 cannot be moved
by any outside force other than by handle movement.
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The previously-mentioned cam member on the
slider 40, which is the roller 42, coacts with a
ramped keeper 100 which is mounted by suitable means
to the vertical wall 30 of the window sash. The
ramped keeper has an inclined ramp section 102 and a
generally planar section 104. The ramped keeper 100
is shown in Fig. 2 in relation to the roller 42 when
the window`sash is not fully closed. With clockwise
rotation of the handle 12 toward the locked position
shown in Fig. 3, the slider 40 moves upwardly and the
roller 42 engages the inclined ramp section 102 and
rolls therealong to draw and maintain the window sash
fully closed when the roller 42 moves onto the
generally planar section 100 of the ramped keeper.
The ramped keeper can be a solid member, as shown, or
can be shaped from a metal plate.
In order to achieve multi-point locking,
the window sash mounts a second ramped keeper 110
having the same construction as the ramped keeper 100
and at a distance therefrom. A second cam member, in
the form of a roller 112, coacts with the ramped
keeper 110. This roller 112 is rotatably-mounted on
a tie bar 114 which is connected to an end of the
slider 40 for lengthwise movement therewith. An
upper end of the tie bar is movable within a tie bar
guide 116 which is fastened to the frame wall 20 by
fasteners 118.
Versatility in the location of points of
locking is achieved by the manner in which a tie bar
114 may be associated with the slider 40.
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The tie bar 114 has a slot 120 at the lower
end thereof which extends lengthwise of the tie bar.
A tie bar rivet 122 is fixed to an offset upper end
of the slider 40 and has a pair of aligned ears at a
distance from the slider. With the tie bar 114 at an
angle to the slider, the slot 120 can be aligned with
the aligned ears of the tie bar rivet and the tie bar
then moved past the ears and, thereafter, rotated to
an alignment position, with the aligned ears then
locking t~e tie bar 114 to the slider. There is
also a tie bar rivet 124 at the lower end of the
slider. The tie bar 114 can thus extend downwardly
from the slider 40. Two tie bars can be used.
Further variations can be achieved by the use of
additional rollers with each tie bar (and additional
ramped keepers) and the use of varying length tie
bars.
The multi-point locking is achieved with
delayed lock-up of the roller 112 and ramp keeper 110
relative to the roller 42 and ramped keeper 100 by
the slider having a length of movement along its path
greater than that required to move a roller along the
inclined ramp section 102 and onto a generally planar
section 104 of a ramped keeper and having the ramped
keepers at a distance apart greater than the distance
between the rollers. A generally planar section of a
ramped keeper has a length greater than the
differences in the distances to provide a dwell for
one roller while the other roller is on an inclined
ramp section.
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An added feature with particular utility
for a vinyl window because of the flexibility thereof
is the bevelling of the rollers 42 and 112 and the
generally planar sections 104 of the ramped keepers,
as seen in Figs. 4 and 5, to resist separation
therebetween in a direction normal to the path of the
slider 40. Referring more particularly to Fig. 4,
any tendency of the window sash to move toward the
left, which would cause separation between the ramped
keeper and the roller, is resisted by the bevelled
relation therebetween.
The sequential locking action at the
multiple lock points has a further advantage in
limiting the maximum amount of force required at any
one time to achieve the full locking of the window.
From the foregoing, it will be evident that
a window lock with extreme versatility and providing
for multi-point locking has been provided.
With the structure of the ramped keepers
having the elongate generally planar sections
providing an elongate dwell, there is an enhanced
versatility in that the ramped keepers can be located
in a desired relation to achieve the desired sequence
of locking at various locking points. The tie bars
can be provided in different lengths and with
different numbers of rollers thereon and the desired
tie bars can readily be associated with the slider at
either the top or bottom thereof with the simple
rotation connection which does not require the use of
any attaching screws between the tie bar and the
slider.
