U.S. patent application number 14/692817 was filed with the patent office on 2015-08-13 for pneumatic door opening and security system.
The applicant listed for this patent is COLD CHAIN, LLC. Invention is credited to Daniel M. Aragon, John C. Cash, Todd J. Lindsey, John J. Prehn, Peter J. Wachtell.
Application Number | 20150225991 14/692817 |
Document ID | / |
Family ID | 47711602 |
Filed Date | 2015-08-13 |
United States Patent
Application |
20150225991 |
Kind Code |
A1 |
Aragon; Daniel M. ; et
al. |
August 13, 2015 |
PNEUMATIC DOOR OPENING AND SECURITY SYSTEM
Abstract
A pneumatic door system and a method of using the same are
disclosed herein. According to one embodiment, a trailer may
include a seamless main door and at least one side door. The doors
may be configured to be locked shut with a system of pneumatic
locks. The main door may be configured to open and close as
controlled by pneumatic pressure applied to a door cylinder. The
pneumatic system may be configured to be controlled by an interior
control box. The pneumatic system may be configured to operate off
of pneumatic pressure in an auxiliary air tank, the pressure being
protected by a series of one-way check valves. The pneumatic system
may also be configured to operate wirelessly using RFID or
Bluetooth technology, among other things, to secure the cargo and
facilitate ingress and egress to the trailer.
Inventors: |
Aragon; Daniel M.;
(Meridian, ID) ; Wachtell; Peter J.; (Boise,
ID) ; Prehn; John J.; (Boise, ID) ; Lindsey;
Todd J.; (Boise, ID) ; Cash; John C.; (Nampa,
ID) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
COLD CHAIN, LLC |
Boise |
ID |
US |
|
|
Family ID: |
47711602 |
Appl. No.: |
14/692817 |
Filed: |
April 22, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13586021 |
Aug 15, 2012 |
9045919 |
|
|
14692817 |
|
|
|
|
61523786 |
Aug 15, 2011 |
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Current U.S.
Class: |
49/506 ;
340/5.64 |
Current CPC
Class: |
E05F 15/77 20150115;
Y10T 292/11 20150401; E05Y 2900/106 20130101; E05Y 2900/516
20130101; E05F 15/50 20150115; F25D 23/021 20130101; E05B 81/10
20130101; B32B 2262/101 20130101; E06B 2003/7044 20130101; E05D
15/16 20130101; B32B 2307/304 20130101; E05F 15/59 20150115; B32B
5/18 20130101; B32B 2266/025 20130101; E06B 3/4407 20130101; E06B
5/00 20130101; B32B 27/304 20130101; B32B 2266/08 20130101; E06B
2003/7051 20130101; E06B 3/80 20130101; E05D 15/24 20130101; B32B
2266/06 20130101; B32B 2266/0221 20130101; B60J 5/108 20130101;
B60J 5/12 20130101; B32B 27/32 20130101; B32B 27/065 20130101; B32B
2419/00 20130101; G07C 9/20 20200101 |
International
Class: |
E05F 15/77 20060101
E05F015/77; G07C 9/00 20060101 G07C009/00; B60J 5/10 20060101
B60J005/10; B60J 5/12 20060101 B60J005/12; E05F 15/50 20060101
E05F015/50; E05F 15/59 20060101 E05F015/59 |
Claims
1-9. (canceled)
10. A method of operating a pneumatic door system, the method
comprising: receiving a wireless signal for opening an overhead
door positioned on a delivery vehicle; actuating a pneumatic
mechanism to open the overhead door; determining that it is time to
close the overhead door; and actuating the pneumatic mechanism to
close the overhead door.
11. The method of claim 10, wherein the wireless signal is an RFID
signal.
12. The method of claim 10, wherein the wireless signal is a
Bluetooth signal.
13. The method of claim 10, wherein determining that it is time to
close the overhead door comprises determining that the wireless
signal is no longer being received.
14. The method of claim 10, wherein determining that it is time to
close the overhead door comprises determining that a set time
period has expired.
15. The method of claim 10, wherein determining that it is time to
close the overhead door comprises a wireless receiver being turned
off.
16. A method of operating a pneumatic door system that includes a
controller configured for receiving wireless signals, the method
comprising: activating a wireless transmitter to transmit a signal
to the controller for opening an overhead door positioned on a
delivery vehicle; and closing the overhead door by one of a)
carrying the wireless transmitter out of range of the controller,
or b) causing the wireless transmitter to stop transmitting the
signal.
17. The method of claim 16, wherein the signal is a pulsed
signal.
18. The method of claim 16, wherein the transmitter continues
sending the signal until a user pushes a button.
19. The method of claim 16, wherein the transmitter continues
sending the signal until a set time period has elapsed since the
transmitter was first activated.
Description
[0001] This application claims benefit of U.S. Provisional
Application No. 61/523,786, filed Aug. 15, 2011, the disclosure of
which is hereby incorporated by reference in its entirety.
BACKGROUND
[0002] The present application relates generally to the field of
doors and more specifically to pneumatic doors for trailers and
containers.
[0003] The delivery of perishable items presents many challenges.
For instance, sea food is a highly perishable product. A variety of
methods for preserving the freshness of sea food exist. In some
cases, sea food is kept alive during transport. In other cases, sea
food is refrigerated or frozen soon after it is extracted from the
ocean and transported quickly to its final destination.
Transporting sea food from coastal regions to land-locked regions
presents significant health and safety challenges.
[0004] Meats are also a very perishable product. Meats may spoil
within hours if they are not treated properly. As is the case with
sea food, meats are refrigerated or frozen soon after animals are
slaughtered and are stored at low temperatures during transport to
avoid spoilage.
[0005] Many food products are stored below freezing (0.degree. C.
or 32.degree. F.). For instance, frozen dinners are common items in
supermarkets today. The dinners are prepared and stored at below
freezing temperatures in order to avoid spoilage which might
otherwise occur after production but before the dinner products are
consumed. Fruits and vegetables are also often transported at near-
or sub-zero temperatures in order to preserve freshness.
[0006] In addition to food products, pharmaceutical and chemical
products are also subject to spoilage. For instance, many vaccines
are stored and transported in temperature-controlled conditions in
order to maintain their effectiveness.
[0007] The storage and transportation of these and other products
often involves a temperature-controlled supply chain, or cold
chain.
[0008] Additionally, foodstuffs, pharmaceuticals, and other
chemical products--whether or not they need to be refrigeratedare
potential targets of terrorists.
SUMMARY
[0009] There is a need for a door system for trailers and
containers that offers one or more of the following benefits. There
is a need for a system that can aid in effectively maintaining the
trailer or container contents at or below a specific temperature.
Having to repeatedly open and close trailer or container doors can
put significant physical stress on drivers, slow down the delivery
process, introduce undesirable amounts of external air into the
trailer or container, and increase the probability of injury.
Furthermore, there is a need for a secure system that effectively
protects the contents of trailers and containers from
tampering.
[0010] In an embodiment, the current disclosure proposes a system
of pneumatic doors and locks with secure back-up systems to protect
the contents of trailers and containers. In another embodiment, the
current disclosure proposes an automatic system of access to the
interior of trailers and containers.
[0011] Another embodiment of the present disclosure is directed to
a pneumatic door system. The door system comprising a main door. A
pneumatic lock is positioned so as to be capable of locking the
main door. The system also includes a pneumatic mechanism for
opening the main door; a tank and a system of valves and conduits
configured to provide fluid communication between the tank, the
pneumatic lock and the pneumatic door opening mechanism; and an
electronic controller configured to open and close the valves to
allow pneumatically opening or closing of the main door and
pneumatically locking or unlocking of the pneumatic lock.
[0012] Yet another embodiment of the present disclosure is directed
to a method of operating a pneumatic door system. The method
comprises receiving a wireless signal for opening an overhead door
positioned on a delivery vehicle. A pneumatic mechanism is actuated
to open the overhead door. A time is determined for closing the
overhead door. The pneumatic mechanism is actuated to close the
overhead door.
[0013] Still another embodiment of the present disclosure is
directed to a method of operating a pneumatic door system that
includes a controller configured for receiving wireless signals.
The method comprises activating a wireless transmitter to transmit
a signal to the controller for opening an overhead door positioned
on a delivery vehicle.
[0014] The overhead door is closed by one of a) carrying the
wireless transmitter out of range of the controller, or b) causing
the wireless transmitter to stop transmitting the signal.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 shows a schematic view of a trailer, according to an
embodiment of the present disclosure.
[0016] FIG. 2 illustrates a control panel, according to an
embodiment of the present disclosure.
[0017] FIG. 3 illustrates a trailer door mechanism, according to an
embodiment of the present disclosure.
[0018] FIG. 4 illustrates a trailer door locking mechanism,
according to an embodiment of the present disclosure.
[0019] FIG. 5 is a flowchart of a method of using a trailer,
according to an embodiment of the present disclosure.
[0020] FIG. 6 is a flowchart of a method of using a trailer,
according to an embodiment of the present disclosure.
[0021] FIG. 7 shows a flowchart of a method of transmitting via an
RFID transmitter, according to an embodiment of the present
disclosure.
[0022] FIGS. 8-12 show flowcharts that illustrate methods of using
the systems of the present disclosure with a lift gate or a ramp,
according to embodiments of the present disclosure.
[0023] FIGS. 13 and 14 illustrate an RFID transmitter, according to
an embodiment of the present disclosure.
[0024] FIG. 15 illustrates a circuit diagram for a receiver,
according to an embodiment of the present disclosure.
[0025] Like reference numbers and designations in the various
drawings indicate like elements.
DETAILED DESCRIPTION
[0026] In the following detailed description, reference is made to
the accompanying drawings that form a part hereof, and in which is
shown by way of illustration specific embodiments in which the
invention may be practiced. These embodiments are described in
sufficient detail to enable those skilled in the art to practice
the invention, and it is to be understood that other embodiments
may be utilized and that various changes may be made without
departing from the spirit and scope of the present invention. The
following detailed description is, therefore, not to be taken in a
limiting sense.
[0027] FIG. 1 shows a schematic view of a trailer 100, according to
an embodiment of the present disclosure. Trailer 100 includes a
main door (see FIG. 3, 301), and two side doors 105A and 105B,
although any number or type of doors can be employed. Access to the
main door is facilitated by an optional lift gate 145. In an
embodiment, a ramp may be used instead of lift gate 145. The lift
gate 145 can be powered by batteries, such as, for example,
batteries 135, which are connected to the lift gate 145 by power
line 140. The main door 301 is configured to open and close using
the pneumatic cylinder 175, which is electrically connected to and
controlled by the control box 110. Pneumatic pressure originates
from an air tank 150, which is connected to an air supply line 160
in one direction, and an inline pressure relief check valve 115 in
the other direction. The inline pressure relief check valve 115
maintains air pressure in the air tank 150, which may be, for
example, a main brake air supply tank. The inline pressure relief
check valve 115 feeds air pressure into the auxiliary air tank 155,
which is connected to a one-way check valve 119 and then in turn to
the control box 110. The control box 110 manages the delivery of
pneumatic pressure to the main door lock 120 and the side door lock
system 125 via the door lock supply lines 165, which can be, for
example, embedded in the wall structure of the trailer 100. Also
attached to the pneumatic system in some embodiments, is an
exterior manual air dump valve, or air switch, 170. If the door
fails to open, a user can flip the exterior air switch and operate
the door manually. Also shown in FIG. 1 is the optional
refrigeration unit 130.
[0028] In operation, the air tank 150 provides pneumatic pressure
to the door and lock systems. In an embodiment, the inline pressure
relief check valve 115 may be configured to maintain an adequate
air supply for a trailer's pneumatic braking system and prevent any
air leaks in the pneumatic distribution system from affecting
braking performance of the trailer 100. In some embodiments, the
auxiliary air tank 155 is configured to receive pneumatic pressure
from the inline pressure relief check valve 115 and then distribute
the pneumatic pressure throughout the trailer's air supply network.
In some embodiments, the trailer 100 may include the one-way check
valve 119 positioned at the interior of the trailer 100, as
discussed above, in order to protect against pressure loss in the
system caused by, among other things, attempts to tamper with the
air lines beneath the trailer, faults in the air supply line 160,
the air tank 150, the auxiliary air tank 155, and the lines that
interconnect them. According to some embodiments, the control box
110 is configured to receive and distribute pneumatic pressure from
the auxiliary tank 155. According to some embodiments, the control
box 110 is configured to distribute pneumatic pressure to the
pneumatic cylinder 175 to open the main door 301. According to some
embodiments, the control box 110 is configured to distribute
pneumatic pressure to the main door lock 120 and the side door lock
system 125. In one embodiment, the main door and the side doors
105A and 105B cannot open unless the main door lock 120 and the
side door lock system 125 are respectively unlocked. According to
some embodiments, the main door lock 120 and the side door lock
system 125 lock automatically when the main door and the side doors
105A and 105B are closed.
[0029] FIG. 2 shows one embodiment of the control box 210.
According to one embodiment, the control box 210 includes two
valves, a main door air valve 216 and a side door lock valve 264.
The air supply lines 260 enter the control box 210 and fluidly
connect to the main door air valve 216 and the side door lock valve
264. The main door air valve 216 is connected to the door cylinder
air lines 280, which are in turn connected to the pneumatic
cylinder 175. The side door lock valve 264 is connected to the side
door lock air lines 265. According to some embodiments, the control
box 210 also includes programmable timers 214 for automatically
closing doors after a predetermined time period. According to some
embodiments, the control box 210 also includes a microprocessor and
timer controller 211 which may include a safety bump edge connector
206, a photo-eye, light curtain beam sensor 207, at least one RFID
connector (an RFID connector 209A and an RFID receiver connector
209B are shown), and a Bluetooth connector 208. The control box 210
may include an exterior surface that may be configured to house a
movement button 217 (i.e. up and down), an emergency air release
218, at least one LED 204, and a programming button 203.
[0030] In operation, the microprocessor and timer controller 211
and the programmable timers 214 may be configured to control the
distribution of pneumatic pressure throughout the pneumatic network
of the trailer 100. According to one embodiment, the microprocessor
and timer controller 211 may be configured to open the main door
air valve 216 and/or the side door lock valve 264 upon the
reception of an acceptable RFID transmission. According to this
embodiment, pneumatic pressure may be sent through the main door
air valve 216, through the door cylinder air lines 280, and on to
the pneumatic cylinder 175, which causes the main door to either
open or close. Also according to this embodiment, pneumatic
pressure may be sent through the side door lock valve 264, through
the side door lock air lines 265 and on to the side door lock
system 125. According to another embodiment, the movement button
217 may be configured to trigger a transmission of pneumatic
pressure to the main door. In one embodiment, the emergency air
release 218 may be configured to release pneumatic pressure and
thereby facilitate the opening of the main and/or side doors 105A
and 105B. For example, a user can push the interior emergency air
release 218 and manually open the main door.
[0031] In another embodiment, programming button 203 may be
configured to cause the microprocessor and timer controller 211
and/or the programmable timers 211 to enter a programming state
where the operation of the pneumatic system may be altered or
adjusted. The LED 204 may be configured to indicate success and/or
failure of the programming process triggered by the programming
button 203. The LED 204 may be configured to shine red, green, and
yellow, among other colors, to indicate different operational
conditions of the control box 210. According to some embodiments,
the microprocessor and timer controller 211 may be configured to
allow RFID, and/or Bluetooth signal reception via connectors 209A
and/or 209B and 208, respectively. The microprocessor and timer
controller 211 may be configured such that signals received via
RFID and/or Bluetooth may facilitate the opening and/or closing of
the main door, and/or the activating and/or deactivating of the
main door lock 120 and/or side door lock system 125.
[0032] The control box 210 may react in a predetermined manner
based on the proximity of RFID and/or Bluetooth transmitters. For
instance, in one embodiment, the control box 210 may be configured
to activate certain pneumatic supply lines when an RFID or
Bluetooth transmitter is in range and deactivate the certain
pneumatic supply lines when the transmitter is out of range. In one
exemplary embodiment, the control box 210 may be configured to open
the main door lock 120 and the main door 301 when an RFID or
Bluetooth transmitter is in range and activated, and then close the
main door 301 and the main door lock 120 when the RFID or Bluetooth
transmitter is either no longer in range or no longer transmitting.
In some embodiments, the programmable timers 214 may be configured
to deactivate the RFID or Bluetooth receivers after a
pre-determined time even while the RFID or Bluetooth transmitter is
still in range.
[0033] The control box 210 may also optionally include means for
signaling operation status by sound. For instance, the control box
210 may include a speaker (not shown) configured to emit a chirping
sound when there is an RFID transmitter in proximity.
[0034] Another possible embodiment can include the presence of
internal and/or external switches (not shown) configured to
activate and deactivate the RFID system of the trailer 100. Both
the internal and external switches can be used to close the door
and turn off the RFID system, which enables the driver to work
inside of the RFID detection range without activating the door.
[0035] FIG. 3 illustrates one embodiment of the door mechanism of
the trailer 300. In some embodiments, the main door 301 is
connected to an adjustable door bracket 346 which is connected in
turn to a carriage assembly 349, which is configured to run on the
pneumatic door control cylinder 375. In an embodiment, the main
door 301 can be configured so as to reduce the amount of cold air
that escapes the trailer 300 on the one hand, and the amount of air
from the exterior that enters the trailer 300 on the other hand.
For instance, door 309 can comprise a paneled door enclosed in a
seamless protective sheath. Other examples of main door 301 are
discussed below. In some embodiments, the carriage assembly 349 may
also include a manual pin release. The main door 301 is also
operably connected to the door track 347.
[0036] In operation, the main door 301 is configured to open and
close. In some embodiments, the pneumatic door control cylinder 375
can receive pneumatic pressure, as determined by the control box
210, from the door cylinder air lines 280 and the main door air
valve 216. In response to the received pneumatic pressure, the
pneumatic door control cylinder 375 engenders movement of the
carriage assembly 349. According to this embodiment, the movement
of the carriage assembly 349 causes the main door 301 to move,
either up or down, along the door track 347.
[0037] Examples of overhead doors that can be used as main door 301
are described in more detail in copending U.S. patent application
No. [ATTORNEY DOCKET NUMBER 0149.0004], filed on Aug. 15, 2012, and
U.S. Provisional Application No. 61/523,786, filed Aug. 15, 2011,
the disclosures of both of which are incorporated herein by
reference in their entirety. In an embodiment, the main door can be
an insulated roll-up door constructed with a solid ballistic
thermoplastic exterior shell, thereby eliminating horizontal seams
between section panels. This can improve thermal performance and
provide a clean flat surface on which to install advertising
decals. The door panel core can be made from a flexible foam, such
as closed cell EVA foam, or any other suitable type of foam.
[0038] FIG. 4 illustrates one embodiment of a locking mechanism of
the trailer 400. In an embodiment, the main door locking mechanism
120 comprises the same structure as the side door locking mechanism
425 of FIG. 4. According to some embodiments, the side door lock
mechanism 425 comprises a pneumatic cylinder 423, at least one air
intake 422, a spring mechanism 424, a magnetic proximity switch
421A, a magnet 421B, a pneumatic bolt 423A, a receiver plate 426,
and a drop bolt receiver 426A. Drop bolt receiver 426A can be, for
example, a hole in the receiver plate 426 through which the
pneumatic bolt 423A can extend.
[0039] In operation, the locking mechanism 425 is connected to the
door lock air supply lines 165, and/or the side door lock air lines
265 of the control box 210 via the air intakes 422. According to an
embodiment, as pneumatic pressure is transmitted to the pneumatic
cylinder 423 of the locking mechanism 425, pneumatic bolt 423A is
configured to retract into the pneumatic cylinder 423. According to
an embodiment, the pneumatic cylinder 423 applies any suitable
amount of pressure for moving and/or maintaining the position of
the pneumatic bolt 423A in a desired manner. An example of a
suitable pressure range is 50 to 150 lbs of pneumatic pressure,
such as about 120 lbs of pneumatic pressure, on the pneumatic bolt
423A. In an embodiment, pneumatic pressure inside the pneumatic
cylinder 423 holds the lock bolt in place. In one embodiment, the
spring mechanism 424 affects the position of the pneumatic bolt
423A in the event of loss of air pressure. For example, the spring
mechanism 424 can retract the pneumatic bolt 423A upon a loss of
pneumatic pressure. Alternatively, the spring mechanism 424 can
maintain the pneumatic bolt 423A in an extended position into the
bolt receiver 426 in the event of loss of air pressure. The
magnetic proximity switch 421A coupled with the pneumatic cylinder
423 can be configured to react when lined up with embedded magnet
421B. According to this embodiment, once the door (e.g. 105A) is
closed, the magnetic proximity switch 421A lines up with the
embedded magnet 421B and causes the pneumatic bolt 423A to extend
into the drop bolt receiver 426A.
[0040] The embodiments illustrated by FIG. 4 illustrate the spring
mechanism 424 in a fail-safe embodiment. The embodiments, as
explained above, may alternatively be configured to operate with a
spring mechanism 424 in a "fail-secure" embodiment. The difference
of the two embodiments being that in one case the doors remain
locked (i.e., the pneumatic bolt 423 remains engaged) with a loss
of pressure, and in the other case, the pneumatic bolt retracts
with a loss in pneumatic pressure.
[0041] FIG. 5 illustrates a method 500 of using the trailer 100
wherein the trailer includes a ramp mechanism, according to an
embodiment of the present disclosure. As shown at 505, the process
begins by the driver arriving at the destination and stopping the
truck. At 510, the driver extends the ramp. At 515, the driver
presses a button on an RFID transmitter unit to begin the
transmission loop (see FIG. 7). According to another embodiment, a
Bluetooth transmitter may be used instead of an RFID
transmitter.
[0042] In one possible embodiment in which an RFID transmitter is
used, the RFID transmitter can operate in an "always on"
transmission mode, and the trailer 100 can be configured to disable
the reception of transmissions such as through the use of a
physical switch or other built-in control mechanism. As shown at
520, the reception of the transmission from the RFID unit of the
driver causes the main door 301 to open. In an embodiment, the main
door 301 is configured to remain open as long as the RFID unit of
the driver is within range of the trailer 100. At 525, the driver
presses a button on the RFID transmitter unit in order to cause the
main door 301 to close. In some embodiments, the RFID transmitter
can be configured such that pressing a button for more than, for
example, two seconds, causes the transmitter to enter a sleep or
low power mode wherein it ceases transmitting; once the transmitter
ceases transmitting, the control box 210 can be configured to close
the main door 301. Alternatively, the control box 210 may be
configured with a button that turns off the RFID receiver in
response to which, the main door 301 will close. According to
another alternative embodiment, the control box 210 of the trailer
100 may be configured with predetermined timers that cause the main
door 301 to close automatically after a predetermined time, even if
the RFID transmitter is still within range. Once inside the trailer
100 with the door 301 closed, the driver may gather the customer's
order without exposing the contents of the trailer to the exterior
air. After the customer's order is gathered, the driver may again
engage the RFID transmitter, which causes the main door 301 to open
again. The driver may then leave the trailer with the customer's
order, and the main door 301 can automatically shut once the RFID
transmitter is outside of range. In an alternative embodiment, the
main door 301 automatically shuts after a predetermined time. If
the driver's delivery is complete, the driver may then get into the
cab of his truck and leave. If the driver still has merchandise to
unload, the driver can engage the RFID transmitter and return to
515 to continue the process until the customer's order is fully
delivered.
[0043] FIG. 6 illustrates another embodiment of a method 600 of
using a trailer, this time with a drop lift gate. The process flow
can begin at 605, upon arrival at a customer delivery location. At
610, the process comprises dropping the lift gate 145 by any
suitable amount, such as approximately 50%. According to an
embodiment, the driver may then step up onto the lift gate 145 and
activate an RFID transmitter. At 620, the main door 301 opens in
response to the RFID transmission. According to an embodiment, once
inside the trailer 100, the driver deactivates the RFID transmitter
by, for example, holding a button for a suitable period, such as
for two or more seconds. According to another embodiment, the
control box 210 may be configured to automatically cause the
closing of the main door 301 after a predetermined amount of time,
even if the RFID transmitter of the driver is still within range.
Once inside the trailer 100, the driver gathers and prepares the
customer's order, and may optionally position the order near the
main door 301 and lift gate 145. Once the order is ready, the
driver activates the RFID transmitter to open the main door 301.
The driver then may push the customer's order onto the lift gate
145. Once on the lift gate 145, the driver may deactivate the RFID
transmitter or alternatively, the main door 301 may be configured
to close automatically after the passage of a predetermined amount
of time and/or if the RFID transmitter is out of range. If the
delivery is complete, the driver may get into the cab of the truck
and leave. Otherwise, the driver may return to the RFID
transmission at 615 of the method 600 and continue the loop until
the order is complete.
[0044] The use of RFID transmitters facilitates relatively easy
close-range signal transmission. However, using RFID transmitters
can also introduce security concerns. In terms of the present
disclosure, an unsecured or insufficiently protected RFID receiver
might be taken advantage of and access gained to the contents of a
trailer or container. One possible solution to the wireless
transmission security concerns is physically enabling the receiver
for use and disabling the receiver when not in use, although, this
solution can be cumbersome. Another solution is to enable and
disable the transmitter unit.
[0045] FIGS. 8-12 show flowcharts that illustrate other examples of
using the systems of the present disclosure with a lift gate or a
ramp. These examples include specific details, such as lowering the
lift gate by 50%, pushing the transmitter button for 2 seconds or
the use of a photo eye, which is a safety feature that is well
known for use with overhead door opening systems generally. The
specific details of these examples are merely exemplary and should
not to be taken in a limiting sense. Thus, one of ordinary skill in
the art would readily recognize that modifications could be made,
such as lowering the lift gate by other percentages, using
different time periods or employing other safety features in place
of or in addition to the photo eye.
[0046] FIG. 7 illustrates an embodiment of a method 700 of
transmitting to a receiver unit in the control box 210. The process
flow at 705 shows that a user activates a transmitter unit, such as
an RFID or other transmitter units discussed above. Generally
speaking, this step comprises putting the transmitter unit in an
operational state. In some embodiments, this may mean pressing a
button on the transmitter unit. As shown at 710, an embodiment of
the method comprises pulsing signals by the transmitter. For
example, the transmitter can be configured to pulse at a desired
rate, such as four times per second.
[0047] The method may be configured to loop back so as to continue
pulsing at 710 until a button is pressed. Until the button is
pressed at 720, the transmitter may be configured to track the
amount of time that has elapsed since the transmitter first was
activated or a button was pressed, as shown at 715. Based upon the
elapsed time, the transmitter can be configured to automatically
enter a sleep mode. For instance, in one embodiment, after twenty
minutes elapses, the timer may enter a sleep mode 750. According to
one embodiment, when a button is held, the transmitter exits its
pulse loop and deactivates, as shown at 725,730. According to other
embodiments, the transmitter may be configured to automatically
deactivate after the passage of a predetermined amount of time, for
instance five minutes. In one embodiment, the transmitter is
configured to deactivate when the button is held for two or more
seconds. According to some embodiments, if the button is pressed
twice, the transmitter is configured to toggle relay 2, as shown at
735,740. According to yet other embodiments, if the button is not
pressed twice and is not held, the transmitter is configured to
toggle relay 1, as shown at 745.
[0048] One embodiment of an acceptable RFID transmitter 1376 is
illustrated at FIGS. 13 and 14. In an embodiment, RFID transmitter
1376 can include a printed circuit board 1378, a user control
button 1380 or other user control mechanism, an indicator light
1382 and an energy source, such as battery 1384. Any other suitable
transmitter could be employed for use in the systems of the present
disclosure instead of, or in addition to, RFID transmitter
1376.
[0049] In an embodiment, the wireless system can provide a
hands-free proximity detection system. Using radio frequency (RF)
transmissions, a key fob can be monitored so that a trailer door
can be opened or closed automatically based on the location of the
key fob. For example, a user can walk up to the door and it will
open, or walk away and it will close.
[0050] The system comprises at least one transmitter and one
receiver, but can be enlarged to have many different
transmitter-receiver pairs. Each transmitter and receiver can have
a unique identification number that is used to pinpoint
communication between the two transmitter and receiver units. This
allows multiple transmitters to operate in the same area without
accidently activating neighboring receivers. These identification
numbers also allow tracking of personnel and equipment.
[0051] In an embodiment, when the transmitter is activated, it can
continuously pulse commands to the receiver instructing it to
activate or deactivate its control relays based on the programming
of the transmitter. The time duration between these pulsed commands
can be an adjustable setting stored on the transmitter, which can
be defaulted to a desired pulse rate, such as, for example, four
times a second. In an embodiment, after the transmitter sends out a
command, it places itself into a sleep condition until the next
command needs to be sent. The transmitter's signal strength can be
controlled through programming software to adjust the activation
distance between the transmitter and receiver.
[0052] The transmitter can be programed in any suitable manner to
allow a user to perform desired functions using any suitable
commands. An example of a set of commands and functions that can be
used with an embodiment of transmitter 1376 is as follows: a user
can press button 1380 when the device is in a powered down state to
energize the transmitter and place it in an operational state; at
which point the previous settings, such as a command for opening a
door ("OPN command") will continuously be pulsed out of the
transmitter; continuously pressing the button for a set length of
time, such as, for example, two seconds, turns the device off;
pressing the button for less than a set period of time, such as one
second, while it is powered on can toggle a command for relay 1,
thereby opening or unlocking a first door, for example; similarly,
pressing the button twice in the set period of time can toggle a
command for relay 2, and pressing the button three times in the set
time period can toggle a command for relay 3. The transmitter can
be programmed to automatically power down if the button 1380 is not
pressed for a set time period, such as 20 minutes, thereby
extending the battery life.
[0053] The receiver can be powered by any suitable power source,
such as a 12 VDC that is over-current and reverse polarity
protected. FIG. 15 illustrates one example of a circuit diagram for
a receiver. In an embodiment, the receiver can include multiple
relays, such as the three relays shown in FIG. 15. Each relay can
handle a function of the receiver based on external signals
received from the transmitter, such as opening/closing or
locking/unlocking doors. Connection to the common ("COM"), normally
open ("NO") and normally closed ("NC") contacts can be supplied
through a terminal strip mounted on the side of the receiver box.
The receiver can include any desired number of antennae. In an
embodiment, two antenna connections are available. For example,
antenna 1 ("ANT-1") can be a direct connect whip type antenna that
can be used for immediate reception near the unit. Antenna 2
("ANT-2") can be a secondary port that can be used to attach a
remote antenna through a coaxial cable, for example.
[0054] In an embodiment, the receiver can have each of its relays
set to one of two states; (1) deactivate when no signal is detected
or (2) hold its current state. When the receiver is set to
deactivate its relays, the relay can deactivate when a signal is no
longer detected from the transmitter and a timeout period has
expired, typically on the order of seconds, such as, for example,
two seconds (e.g., an unlocked door can lock when the relay
deactivates). When the transmitter signal is detected again, the
relays can return to the current commanded state received from the
transmitter (e.g., the door can return to being unlocked). When the
receiver is set to hold the current state, the relays can remain in
the last command state, even if the signal is not being received
from the transmitter (e.g., the door remains unlocked when the
signal is not being received).
[0055] Although this invention has been described in terms of
certain preferred embodiments, other embodiments that are apparent
to those of ordinary skill in the art, including embodiments that
do not provide all of the features and advantages set forth herein,
are also within the scope of this invention. Accordingly, the scope
of the present invention is defined only by reference to the
appended claims and equivalents thereof.
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