Note: Descriptions are shown in the official language in which they were submitted.
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mGH-SPEED DOOR ASSEMBLY
DESCRIPTION
Technical Field
The present invention relates to an industrial high-speed door assembly, and
more
specifically, to facilitating the realignment of a door panel that has been
displaced from
its normal operative configuration.
Related Applications
This application is related to and relies upon, the priority of U.S.
Provisional
Application Nos. 60/834,193 filed July 29, 2006, and 60/877,475 filed December
27,
2006.
Background of the Invention
High-speed industrial doors, which are capable of being rolled up on a shaft
or
dram to open, have long been used in the storing and staging areas of
commercial
buildings such as factories and warehouses. Materials handling machinery, such
as
conveyors and lift trucks are commonly used to transport items to, from, and
between
storage areas and staging areas such as loading docks. In such applications,
as well as
others known in the art, the industrial doors are often required to open
quickly, such as
opening at a rate of approximately 48 inches per second up to 100 inches per
second or
greater. This speed enhances productivity, cost savings, and safety,
especially where cold
storage and distribution is involved Additionally, specific environmental or
security
requirements may need door speed and sealing integrity to be maintained in
either the
storing or staging area or both, e.g., temperature, cleanliness, etc.
Conventional high-speed roll-up door assemblies include a pair of vertically
oriented assemblies installed proximate the vertical sides of an opening
defining the
passageway for people and commercial vehicles and are sometimes called "side
columns," or "guide assemblies." The side columns are have structures which
guide the
flexible door panel during opening and closing. These "guides" provide
surfaces which
engage a vertical marginal edge portion of the moving door panel therein. The
guide
assemblies are installed on only one side of the opening and do not extend
into the width
of the opening so as to maximize the clear path of travel for freight-moving
vehicles
traversing the passage, and to avoid damage to the assemblies from collisions.
The
flexible door panel, often including its accompanying parts, e.g., a
relatively rigid bottom
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bar, guide retention means such as rollers, knobs, etc., is thus made wider
than the width
of the opening such that a vertical margin of the door panel on each side of
the opening
near the vertical side edges thereof, extends into and is thus guided or
retained within the
guides.
Even though the door panel is moved vertically at a relatively fast rate,
there are
times when the door panel-or a portion of the door assembly itself-is impacted
by a
vehicle and dislodged from at least one of the guides. The door assembly
cannot operate
properly until the displaced door panel is reconfigured to be within the door
assembly's
guides so as to be in its normal operating configuration.
Reconfiguring or "repairing" the door's guiding function after an impact has
been
the subject of the design of others including the applicants of this
application. However,
the prior art has only limited or no solutions for restoring or `repairing" of
an automatic
high speed roll up door when it is dislodged in a direction which places the
panel inside
of, or through, the opening of the passage. In this case, with a conventional
roll-up door,
the wider door panel will be pushed through the narrower opening distorting
its normal
shape so as to comply with the width of the opening of the passage. As a
result, the door
panel and its associated structures as well as the side columns and the wall
portions
constituting the opening, are more susceptible to damage both because of the
dislodging
and the gesticulations required to repair the door to its operational state.
These
difficulties can result in commercial losses due to lost-productivity, thermal
losses, and
loss of environmental integrity on one or both sides of the door. Repairing
the door may
also tend to damage the door panel or guide assemblies. The repair from such a
dislodgement is routinely accomplished through human operator effort, and is
not
automated. The door panel must be moved back to the other side of the opening
before
being realigned and reinserted within the guides. Returning the door panel to
the door-
assembly side of the opening can be difficult perhaps even requiring
disassembly of
portions of the door assembly-and may incur additional time, and further
expose the
door panel to more damage.
It is known in U.S. Patent Nos. 5,141,043 and 5,319,015 to provide a "self-
repairable" industrial door assembly having side uprights each including a
slideway
having a guide wall on either side of the plane of a door panel or curtain.
Lateral portions
of the curtain slide within the slideways and are adapted to escape from the
slideways in
the event of an abnormal or atypical transverse force. However, these doors
work well
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inly if the dislodgement of the door panel in the direction of the side of the
opening
vhere the guide assemblies are installed. If the door is displaced in the
opposite
lirection, the stiff (relative to repairing) door panel material is forced to
deform from its
inbuclded state to fir within the opening. Automated or easy repair on such an
instance
;an again be costly and/or can put undue wear on the door panel and guide
assemblies.
Applicant is aware of low speed doors used in U.S. car washes which have loose
Or relatively wide stationary guides installed on the inside a door opening
and have
relatively non-std light weight material comprising the door panel. These
doors can
repair themselves with some degree of success when dislodged in either
direction.
However, the low speed and reduced weight and stiffness of these doors are
unacceptable
for applications hike freezer and warehouse applications because of the
commercial
demands for security, wind load, insulating ability, and high speed. Also, the
flexibility
of these light weight panels reduces potential damage while problems in
waiting for
repair are less critical in the car wash application. There is also far less
criticality to
maximizing the door opening width. In the meantime automobile traffic guided
through a
car wash, especially by its owner, does not experience the high speed and high
rate of
freight vehicle traffic that high speed industrial door assemblies are
required to manage or
the higher rate of collisions between door and vehicle.
The present invention is provided to address these and other considerations.
Summary of the Invention
In the broadest aspect of the invention, the door panel is sized to better fit
between
the opposites sides of an opening in a wall to which a door assembly is
mounted to
facilitate enhanced manual, and preferably automated self-repair, of a door
panel when it
is dislodged from its vertical guides, such as by impact with a vehicle into a
passageway
defined in part by the opening. A door so sized can more easily be retracted
(to an open
position) for re-feeding into its guides than one which, as is conventional,
is sized to be
wider than the opening for guiding.
To accommodate this sizing of the panel, guides for the panel are sized and
configured to extend into the passageway generally defined by the opening. To
reduce or
eliminate the problems associated with this configuration one or more the
following novel
techniques for a high speed door is contemplated.
The goals of the invention can be achieved by at least a portion of the panel
guides
which extend into the passageway can be constructed to effectively minimize
reduction of
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he passageway by allowing workers to effectively treat the opening as being
equal to the
-assageway by reducing damage to the guides if bit In some embodiments, this
is
iccompliished constructing at least the portion of at least one of the guides
which
,rotrudes into the passageway: (1) of a resilient and/or tough material (e.g.
Bunn N
ubber) such that the guide portions can withstand a hit and return resiliently
or
nechanically to their pre-contact position for guiding; or (2) in a way which
allows at
least one of the guides to collapse when hit and return afterwards for guiding
by virtue of
either its shape and configuration alone or shape, configuration, and material
properties.
The objects of the invention can also be achieved by constructing one or both
of
the guides (or at least a vertically lower portion of same which is most
commonly hit) in
a way where - upon activation of the door for opening, or at least during
initial opening
of the door, the guide(s) is automatically moved outwardly away from the
passageway to
define a larger passageway during opening. This accomplishes accommodation of
guiding the narrower door panel and reduces the likelihood of the guide(s)
being hit and
the likelihood of the panel being dislodged from the guides in a way which
requires
repairing. It is contemplated that this latter method and configurations may
be carried out
by various motive devices such as: solenoids moving at least the lower portion
of a
guide(s) or tripping a spring or other device upon activation which will move
it; or linear
variable displacement transducers; or motor-driven gear drives; or the like.
According to
one embodiment of the invention described more fully below, as a result of
door
activation and movement of the door panel upwardly, a counterweight used to
assist in
raising the door panel, is configured to interact with a guide assembly to
retract it during
opening to prevent the guide from protruding into the passageway-during
traverse of same
by a vehicle.
Accordingly, one embodiment of the present invention is directed to a high-
speed
door assembly capable of vertically moving a flexible door panel to permit and
prohibit
access through an opening having a width defined by opposed sides. The high-
speed
door assembly is adapted for displacement of its door panel from its operative
path of
travel upon receiving an atypical dislodging force and includes a first guide
operatively
mounted proximate the opening and having opposed surfaces between which a
portion of
the door panel is guided during movement of the door panel and wherein at
least a portion
of the opposed surfaces extends into the opening. The high-speed door assembly
also
includes a second guide operatively mounted proximate the opening and having
opposed
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surfaces between which a portion of the door panel is guided during movement
of the
door panel and wherein at least a portion of the opposed surfaces extends into
a
passageway defined by the opening.
Another aspect of the present invention includes that at least one of the
guides is
collapsible wherein a portion thereof is flexible and capable of retracting-
upon impact
thereto; and subsequently being capable of substantially returning to its
initial operative
configuration-
A further aspect of the present invention includes at least one of the opposed
surfaces of either guide including a realignment ramp attached thereto and
proximate the
top of the opening. The realignment ramp may be movable and projects upward
and at an
angle away from the path of travel so as to facilitate operative alignment of
the door panel
within the path of travel subsequent to the displacement of the door panel
there from.
In yet another aspect of the present invention, the high-speed door assembly
includes a motor for vertically moving the door panel to -permit and prohibit
access
through the opening. A sensor for detecting atypical movement of the door is
operatively
coupled to the motor such that the motor is capable of reacting to the event,
to stop panel
movement, reverse it, slow its speed, go into a "repair mode," or combinations
of these.
Yet another aspect of the present invention is directed to a high-speed door
assembly operatively mounted proximate an opening with a width of the opening
defined
by opposed sides. The high-speed door assembly vertically moves a door panel
to permit
and prohibit access through the opening and includes a first guide operatively
mounted
proximate the opening and having opposed guide surfaces. A portion of the door
panel
moves through the first guide's opposed surfaces during opening and closing,
and at least
a portion of the opposed surfaces extends into the opening. A second guide is
operatively
mounted proximate the opening and has opposed surfaces between which a portion
of the
door panel is guided during opening and closing, wherein at least a portion of
the second
guide's opposed surfaces extends into the opening. A guide moving assembly is
operatively connected to at least one of the first or second guides, where, in
conjunction
with movement of the door panel, at least a portion of one or both of the
guides is
movable between a first position and a second position.
In another aspect of the present invention including the guide moving
assembly,
an actuator is utilized with a'track wherein at least one of the guides is
operatively
connected thereto. The actuator and track cooperate to move the guide between
the first
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and second position. Preferably, in one of the first or second positions, one
of the guides
extends into the opening, and in the other of the first or second positions,
at least a portion
of one of the guide does not significantly extend into the opening.
In another embodiment of the invention, a counter-weight is operatively
attached
to the door panel and a drive means to facilitate movement of the door panel.
A chute
including a path of movement for the counter-weight is proximate the opening
and is
operatively connected to at least one of the guides, which is preferably
pivotably mounted
near the opening. A deflection member is attached to the guide and positioned
within the
path of movement of the counter-weight. As the counter weight contacts the
deflection
member in a first direction, the guide will move from its first position to
its second
position; and, upon contact of the counter-weight with the deflection member
in a second
direction, the guide will move from its second position and return to its
first position.
In another embodiment of the invention, a method is provided for realigning a
dislodged door panel of a high-speed door assembly. The method includes
detecting
displacement of the door panel from its typical operative path of travel, and,
in response
to the detection of the displaced door panel, reducing the speed of travel of
the door
panel.
In another embodiment, at least one of the guides of a high-speed door
assembly
is movably mounted so that it can receive contact from an outside force, e.g.,
lift truck,
without incurring inoperative or disabling damage, or requiring manual repair.
The
movably mounted guide is biased into a normal operative position and upon
receiving an
impact sufficient to displace it from its normal operative position, will
subsequently
return to it normal operative configuration.
It is to be understood that the aspects and objects of the present invention
described above may be combinable and that other advantages and aspects of the
present
invention will become apparent upon reading the following description of the
drawings
and detailed description of the invention.
Brief Description of the Drawings
In the drawings:
FIG. I is a front view of one embodiment of the present invention;
FIG. 2 is a partial cross-section view of the present invention shown in FIG.
I and
taken along line 2-2;
FIG. 3 is a partial top view of the present invention shown in FIG. 1;
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FIG. 4 is a partial top view of another embodiment of the present invention;
FIG. 5 is a partial side view of another embodiment of the present invention;
FIGS. 6A and 6B are partial top views of another embodiment of the present
invention depicting a movable guide;
FIGS. 7A and 7B are partial front views of the present invention shown in
FIGS.
6A and 6B;
FIGS. 8A-8D are partial front 'views of another embodiment of the present
invention depicting a movable guide;
FIG. 9 is a partial front view of the present invention shown in FIGS. 8A 8D;
and,
FIGS. 10A-10C is a partial front view of another embodiment of the present
invention depicting a movable guide utilizing a gravity or shape based bias
mechanism.
Detailed Description
While the present invention is susceptible of embodiment in many different
forms,
there is shown in the drawings and will herein be described in detail
preferred
embodiments of the invention with the understanding that the present
disclosure is to be
considered as an exemplification of the principles of the invention and is not
intended to
limit the broad aspect of the invention to the embodiments illustrated.
FIGS.1, 2 and 3 generally disclose a high-speed door assembly 10 that rolls
and
unrolls a door panel 12 to permit and prohibit access through a passageway 14.
The
passageway 14 includes an opening 16 having a width W defined by opposed sides
of the
wall forming the opening 16.. The passageway extends perpendicular to and
beyond the
opening. To permit access through the passageway 14, the door panel 12 is
vertically
displaced up and down by rolling up and unrolling on a drum (although in other
embodiments, the door panel may be accumulated overhead by other means such as
a
track, rail, and the like. Preferably, the door panel 12 is a continuous piece
of material,
e.g_, a flexible sheet or panel, but may be comprised of two or more segments,
sheets or
panels.
A drive means 18, e.g., an electric motor, is operatively connected to the
door
panel 12 and is mounted above the passageway 14 to move the door panel
vertically up
and down. The drive means 18 may also include a controller 19 and a sensor 20
in a rigid
bottom bar 21 at the lower edge of the panel 12 as is known in the art. The
controller 19
is responsive to the sensor 20 and has a plurality of operating modes in which
to control
the operation of the drive means 18 to move the door panel 12 at an opening
speed of
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approximately 0-100 inches/second or more. The drive means 18 is responsive to
the
controller 19 which is preferably mounted to either one of the sides of the
opening 16.
The high-speed door assembly 10 is adapted for displacement of its door panel
12
from its operative path of travel upon receiving a force for example from a
collision with
a fork-lift vehicle, which causes movement atypical to its normal mode of
operation and
may also dislodge the door from its assembly. The sensor 20 is capable of
detecting
either atypical alignment of the door panel 12 with its guide(s) 22, 23 or the
atypical force
applied to the door (for example when such as a pneumatic sensor, a strain
gauge, or an
accelerometer is employed as a sensor). The controller 19 responsive to the
sensor 20
sending a signal indicating detection of an atypical force or misalignment of
the door
panel 12 with its guides, 22, 23 may be programmed to stop vertical movement
of the
door panel 12, reverse the direction of travel from down to up, or decrease
the speed of
travel of the door panel. Preferably, if the panel was moving downward, the
controller 19
either stops the panel then reverses its direction and speed, or just reverses
its direction
and speed to roll the panel 12 up to a point where the bottom edge, in this
case the bottom
bar 21 can be aligned either by gravity or some manual urging back into
alignment with
its guides 22, 23. At that point, the controller may permit continued
operation of the
door panel '12 or may optionally wait for a diagnostic test which can be
partially or totally
manual or automated.
FIGS. 3 and 4 disclose one side of the vertical guide assembly (22) with
reference
numbers provided (without a separate drawing) of the identical (left-hand,
right-hand)
configuration of the two opposed guide assemblies 22,.23. Hence, FIG. 3
discloses a
first guide 22 (23) operatively mounted on one side of the wall to which the
door panel
assembly is mounted and near the opening 16. FIG. 3 discloses guide surfaces
24,26 and
25, 27 between which opposite vertical margins of the door panel 12 are guided
during
opening and closing. At least a portion of the opposed surfaces 24, 25; 26, 27
extend into
the passageway 14. The first guide 22 is spaced apart from and aligned with
the second
guide 23 to define a planar (or horizontal or vertical) plane defining a path
of travel 28
(FIG. 5) for the door panel 12 such that a portion of the door panel near the
sides of the
door panel-is guided within the first 22 and second 23 guides. To a large
extent, the
path of travel 28 is in a plane that is substantially parallel with the
opening 16 and
substantially pia to the passageway 14..
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Referring now to FIG. 4, one embodiment of the present invention provides that
a
portion of at least one of the first 22 or second 23 guides are resilient or
collapsible so as
to respond to an impact on them by initially retracting from the passageway 14
then
rebounding to substantially their initial configuration. This may be
accomplished by the
guides 22, 23 being made of a flexible material, e.g., rubber, having an
inherent resiliency
or of bended metal wherein due to its shape has formed a resilient spring as
shown in
FIG. 4. It is further contemplated that a bias means 30 can be utilized with
the guide 22,
23 to achieve an amount dynamic response to facilitate temporary flexing or
retracting
upon impact and then subsequently substantially return to an operable
configuration for
opening and closing. Mechanical bias mechanisms, e.g., mechanical or chemical
(polymer) springs or gravity can comprise or be operatively connected to the
guide.
FIGS. 10A--10C, disclose a gravity-based bias mechanism 31 wherein the guides
22, 23 essentially. suspend proximate the opening 16. The guides include a
slanted slot 33
wherein a pin 35 is located therein. Upon receiving an impact, the guide 22,
23 will flex
on impact. Due to the geometrical configuration of the gravity or shape based
bias
mechanism 31, the guide 22, 23 will slide slightly upward along the pin 35 and
then
eventually return to its original position.
Another aspect of the present invention is shown in FIG. 5, wherein at least
one-
preferably both-of the guides 22, 23 of the high-speed door assembly 10
includes a
realignment ramp 32 attached thereto and proximate the top of the opening 16.
The
realignment ramp 32 projects upward and at an angle away from the path of
travel 28 so
as to facilitate operative alignment of the door panel 12 within the path of
travel
subsequent to displacement of the door panel from the guides 22, 23.
Displacement of the door panel 12 can result from contact of a sufficient
force FA,
FB upon the door panel to dislodge it from at least one of the guides 22, 23.
The
dislodging force can approach from either side A, B of the opening 16. Upon
displacement of the door panel 12 from guide(s) 22, 23, the drive means IS
preferably
halts movement of the door panel for a predetermined amount of time and then
reinitiates
movement of the door panel such that the dislodged door panel will eventually
approach
the top of the opening 16 wherein the bottom portion of the door panel will
slip over and
past the realignment ramp 32 and return within the guides 22, 23 for
subsequent
operation.
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Upon receiving a sufficient force FB on the side B of the opening 16 where the
high-speed door assembly 10 is mounted, the door panel 12 will dislodge from
at least
one of the guides 22, 23. Because the guides 22, 23 extend into the opening
16, the width
of the door panel is less than or equal to the width W of the opening. As
such, the door
panel 12 is permitted to more freely move through the opening 16 and is
primarily
prevented from returning through the opening by the guides 22, 23 extending
therein-was
opposed to the structure, e.g., wall, defining the sides of the opening. Upon
detection of
the displaced door panel 12, the sensor 20 will send a signal to the
controller 19. The
controller 19 will change the operating mode of the drive means 18 and the
door panel
will eventually be moved up toward the top of the opening 16 and pass by the
realignment
ramp 32 to return within the guide and on plane within the path of travel 28.
The realignment ramp 32 is movable so that the entire door panel 12 will
eventually be pulled past the movable realignment ramp and return between the
guides
22, 23. Various embodiments of the movable realignment ramp 32 are envisioned
by the
present invention, including, and not limited to: being operatively attached
to one of the
surfaces 24, 25, 26, 27 of the guides 22, 23; being integral with one of the
surfaces of the
guides; and being biased-inherently via physical composition or shape, or
mechanically,
e-g., spring, coil, and the like.
In a preferred embodiment, each guide 22, 23 will include a pair the
realignment
ramps 32 to facilitate normal operative configuration of the door panel 12
independent-of
the side of the opening 16 on which the door panel is displaced.
As shown thus far, due primarily to the configuration of the guides 22, 23
extending within the opening 16, the "self-repairable" high-speed door
assembly 10 of the
present invention is capable of quick and easy reconfiguration regardless of
the direction
of the dislodging force. And although the extension of a portion of the guides
22, 23
appears to lessen the width W of the opening 16, the movable guide described
herein is
capable of collapsing and/or retracting and thus effectively providing a width
substantially as wide as the opening.
Alternatively, another aspect of the present invention is shown in FIGS. 6A,
6B,
7A, and 7B and is directed to a guide moving assembly 34 that is operatively
connected
to at least one of the guides 22, 23. In conjunction with raising and lowering
of the door
panel 12, a portion of one of the guides is movable between a first position
and a second
position. In the first position, the guide(s) extends into the opening 16,
(see FIGS. 6A and
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7A) and in the second position, at least a portion of the guide(s) does not
extend into the
opening (see FIGS. 6B and 7B); and vice versa. The guide moving assembly 34
includes
an actuator 36 operatively connected to the guide(s) 22, 23. Preferably, the
actuator 36
cooperates with a track 38---single or multiple rail-upon which the guide 22,
23 is
operatively connected. The actuator 36 cooperates with the track 38 to move
the guide
22, 23 between the first and second positions. Upon detection of an
approaching vehicle
intending to travel through the opening 16, the actuator 36 will move at least
a portion of
the guide(s) 22, 23 from its initial position so as not to extend into the
opening. Thus, as
the door panel 12 is being moved upward to permit access through the opening
16, at
least a portion of the guide(s) 22, 23 will be moved and retracted from
substantially
extending into the opening to expose its full width W for passage of the
vehicle there
through. Subsequent to the passage of the vehicle through the opening 16 and
in
conjunction with the downward movement of the door panel 12 to prohibit access
through
the opening, the actuator 36 will return the guide(s) 22, 23 to its initial
position as the
door panel 12 is lowered.
It is to be understood that various types of actuators known to one of
ordinary skill
in the art can be utilized with the present invention, including, and not
limited to: a motor
and cooperating cam, an air cylinder, and an electric solenoid.
Another embodiment of an alternate guide moving assembly is shown in FIGS.
8A through 8D; 9A, and 9B and includes a counter-weight 40 operatively
attached to the
door panel--preferably via the drive means 18. This embodiment moves a lower
portion
of the guides which are most commonly hit by traffic out of the passageway 14
beginning
upon initial movement of the door panel 12 upwardly and replaces the guides
for guiding
upon closing of the door panel 12.
The counter-weight 40 is a source of potential energy utilized to facilitate
the
upward movement of the door panel 12 along its path of travel 28. The guide
22, 23 is
preferably pivotably mounted near the opening 16 and operatively attached to a
chute 42.
Although the guide 22, 23 extends into the opening, the chute 42 does not. The
chute 42
includes a path for the counter-weight 40 to travel. A deflection member 44 is
attached to
the guide 22, 23 and in line with the counter-weight's path within the chute
42. Upon
opening the door panel 12, the counter-weight 40 will eventually contact the
deflection
member 44 wherein the guide 22, 23 will be subsequently moved from its first
position.
Upon closing of the door panel 12, cooperation of the counter-weight 40 with
the
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deflection member 44 will eventually move the guide 22, 23 from its second-
retracted-
position and return it to its first position.
Due to the pivotable mounting of the guide 22, 23 near the opening 16, it is
apparent that although a portion of the guide will be retracted to expose the
full width W
of the opening, a portion of the guide may remain or further extend into the
opening.
When permitting access through the opening 16, it is preferable to move the
pivotable
guide(s) 22, 23 such that the full width W of the opening 16 is exposed to a
height of at
least approximately 4 feet to accommodate unencumbered passage of transport
vehicles
through the opening. In consideration of the interrelated and/or cooperating
components
of the high-speed door assembly 10 of the present invention-e.g., height and
width of
opening 16 and door panel 12; degree of pivot for the guide 22, 23; shape or
geometry of
the counter-weight 40 and the cooperating deflection member 44-it is further
apparent
that without undue experimentation, the door assembly of the present invention
can be
configured by one of ordinary skill to attain the desired operating
characteristics of the
high-speed door assembly.
The movable characteristics of the guides 22, 23 described herein, whether the
guide is collapsible, retractable, or pivotable, provide the high-speed door
assembly 10 of
the present invention with ability for adaptation as a separator between
differing
environments, e.g., cold/warm storage, humidity, clean rooms. It is
contemplated by the
present invention that the guides 22, 23 can be extruded of an engineered
material, e.g.,
plastic, fiberglass, foam, and combinations thereof, that lend themselves to
use in such
environments, wherein lower costs due to repair or replacement will be
achieved. For
example, energy costs related to insufficient insulation or the
prevention/reduction of
accumulated frost on the guide 22, 23 can be reduced by the implementation of
guides
including specifically engineered material(s) suited for such purposes.
It is to be understood that additional embodiments of the high-speed door
assembly described herein may be contemplated by one of ordinary skill in the
art and
that the scope of the present invention is not limited to the embodiments
disclosed. While
specific embodiments of the present invention have been illustrated and
described,
numerous modifications come to mind without significantly departing from the
spirit of
the invention, and the scope of protection is only limited by the scope of the
accompanying claims.
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