The present invention comprises a system for remote control of garage doors and other devices wherein an extremely large number of codes are available for remote transmitters for operating the garage operator and wherein each transmitter has its own unique and permanent nonuser changeable code. The receiver at the garage door operator is capable of storing and remembering a number of different codes corresponding to different transmitters such that the receiver can be programmed so as to actuated by more than one transmitter code thus allowing two or more transmitters to actuate the same garage door operator and wherein the receiver stores the valid codes for the different transmitters.

Patent
   RE35364
Priority
Aug 24 1989
Filed
Apr 20 1995
Issued
Oct 29 1996
Expiry
Oct 29 2013
Assg.orig
Entity
Large
69
49
all paid
1. A garage door operator for a garage door comprising, a garage door operation mechanism with an output shaft connected to said garage door to open and close it, a radio receiver, a decoder connected to receive the output of said radio receiver, a microprocessor connected to receive the output of said decoder and to said garage door operation mechanism to energize it, a switch moveable between program and operate positions connected to said microprocessor to place said microprocessor in the operate or program mode, a memory means for storing a plurality of addresses connected to said microprocessor when said switch is in the program position, a memory selection switch connected to said microprocessor, a plurality of radio transmitters with different codes, said memory selection switch setable in a first position at a time when a first one of said radio transmitters is energized so that the code of said first transmitter will be stored in said memory means and said memory selection switch set in a second position at a time when a second one of said radio transmitters is energized so that the code of said second transmitter will be stored in said memory means, and said microprocessor placed in the operate mode when said switch is in the operate position so that either or both of said first and second radio transmitters when energized cause said microprocessor to energize said garage door operator mechanism.
2. A garage door operator for a garage door according to claim 1 wherein said first and second radio transmitters when energized radiate coded signals and said microprocessor receives and compares coded signals from said first and second transmitters with coded signals from said first and second transmitters with coded signals stored in said memory means and said microprocessor produces a garage door operate signal if the received transmitted signal and any one of said coded signals stored in said memory means match.
3. A garage door operator according to claim 2 wherein said memory selection switch has "n" positions where "n" is an integer and the codes of "n" transmitters can be stored in said memory means when said switch is in the program mode.
4. A garage door operator according to claim 3 wherein the code stored in said memory means can be changed by placing said switch in the program mode and one of said plurality of transmitters is energized which has a code which differs from the code previously stored in said memory means.
5. An operator for controlling operation of equipment comprising: a radio receiver, a decoder connected to receive the output of said radio receiver, a microprocessor connected to receive the output of said decoder and to said equipment to energize it, first switch means for selection between program and operate positions connected to said microprocessor to place said microprocessor in the operate or the program mode, a memory means for storing a plurality of addresses connected to said microprocessor when said first switch means is in the program position, a memory selection second switch means connected to said microprocessor, a plurality of radio transmitters with different codes, said memory selection second switch means being adapted to select a first position at a time when a first one of said radio transmitters is energized so that the code of said first transmitter will be stored in said memory means and said memory selection second switch means being adapted to select a second position at a time when a second one of said radio transmitters is energized so that the code of said second transmitter will be stored in said memory means, and said microprocessor placed in the operate mode when said first switch means is in the operate position so that either or both of said first and second radio transmitters, when energized cause said microprocessor to energize said equipment. 6. An operator according to claim 5 wherein said first and second radio transmitters when energized radiate coded signals and said microprocessor receives and compares coded signals from said first and second transmitters with coded signals stored in said memory means and said microprocessor produces an operate signal if the received transmitted signal and any one of said coded signals stored in said memory means match. 7. An operator according to claim 6 wherein said second switch means, has "n" positions where "n" is an integer and the codes of "n" transmitters can be stored in said memory means when said first switch means is in the program mode. 8. An operator according to claim 7 wherein the code stored in said memory means can be changed by placing said first switch means in the program mode and one of said plurality of transmitters is energized which has a code which differs from the code previously stored in said memory means.

This application is a continuation of application Ser. No. 087,142 filed Jul. 2, 1993, abandoned, which is a continuation of application Ser. No. 715,006, filed Jun. 13, 1991, abandoned, which is a continuation, of application Ser. No. 398,379 filed Aug. 24, 1989 abandoned.

This application comprises an improvement on application Ser. No. 615,339, filed May 30, 1984, U.S. Pat. No. 4,638,433, in which the inventor is Wayne R. Schindler assigned to the assignee of the present application.

1. Field of the Invention

This invention relates in general to garage door operators and in particular to a novel garage door operator wherein the receiver can be energized by two or more transmitted codes which are stored in the receiver.

2. Description of the Prior Art

Garage door operators of the prior art used transmitters in which the code can be changed by various methods as, for example, by moving two position switches to change the code. Such systems have also used code changing switches in the receiver so that the receivers can be set to correspond to the selected transmitter code.

It has also been known to use fixed frequency transmitters and fixed frequency receivers such that if the transmitted frequency matches the receiver frequency the receiver will respond.

It is an object of the present invention to provide a plurality of transmitters wherein each transmitter has its own unique and permanent non-user changeable code and wherein the receiver can be placed into a program mode wherein it will receive and store two or more codes corresponding to two different transmitters. The number of codes which can be stored in transmitters can be extremely high as, for example, greater than one million codes. Thus, the invention makes it possible to eliminate the requirements for code selection switches in the transmitters.

In the present invention the decoder module in the receiver will be capable of learning several different transmitted codes which will eliminate code switches in the receiver and also provides for multiple transmitters for actuating the garage opener.

The communication link can be various system such as radio frequency, light, wires, etc.

The invention makes it very easy for the user to operate the system and more secured code systems are available due to the higher number of available codes.

An encoded signal will be utilized wherein a pulse and blank time comprises a sync time base and different link pulses such as 1, 2, 3 or 4 milliseconds can be selected so as to provide different codings. Each datum can be 1, 2, 3 or 4 times the length of the sync pulse. The timing is from the rising edge to rising edges of the pulse and with ten data bits the number of codes can be in excess of one million codes.

In the invention, each transmitter encoder will contain a chip which contains a unique code and the receiver will be able to memorize two or more as, for example, five different transmitter codes. This eliminates the need to have coding switches in either the transmitter or receiver. This eliminates the requirement that the user set the code switches so they match since the code switches are eliminated.

In the invention, during an operate mode, a receiver code must match an already programmed code four times in order to operate the garage door. This match is referred to as a valid code. Each valid code can be separated by up to two error codes and still have the output indicated as accurate.

In the program mode a code must be received four times in a row in order to be permanently stored in the receiver. Any error code will reset the valid code counter.

The advantage of the coding scheme are:

1. Higher peak power without exceeding the FCC rules which gives longer transmitter range.

2. Eliminate code switches in the transmitter and receiver making it easier for a customer to install and operate his garage door operator.

3. Customers having more than one transmitter will not have to match codes.

4. More secure codes due to the higher number of combinations which are available. Other objects, features and advantages of the invention will be readily apparent from the following description of certain preferred embodiments thereof, taken in conjunction with the accompanying drawings although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure and in which:

FIG. 1 is a perspective view illustrating a garage door operator;

FIG. 2 illustrates in block form the invention;

FIG. 3 comprises a flow diagram;

FIG. 4 is a continuation of the flow diagram; and

FIG. 5 illustrates the coding scheme.

FIG. 1 illustrates a garage door operator 10 mounted to the ceiling of a garage and connected to operate a door 17. Garage door operator 10 has a head unit 11 which is supported from the ceiling which includes a motor which drives a suitable chain to which a trolley 13 is attached so that it moves along a rail 12. The trolley 13 has a release cord 20 and pivotally carries a lever arm 14 which is attached to a bracket 16 mounted to the door so as to raise and open it by pulling it along conventional rails.

The header unit 11 includes a receiver and operating mechanism and can be actuated from a control unit 38 which has a operate switch 39.

The garage door operator can also be operated by the transmitters 26 and 28 which have operate transmit buttons 27 and 29, respectively.

As illustrated in FIG. 2 the garage door operator includes a receiver 41 which has a suitable antenna 42 for receiving radio frequency transmissions from the transmitters 26 and 28 and supplies an input to a decoder 43 which provides an output to a microprocessor unit 44. The microprocessor unit 44 is connected to a garage door operator mechanism 46 which includes the motor which drives the chain 15 to move the door 17 in a conventional manner. The control 38 is connected to the microprocessor 44. A pair of switches 22 and 23 are mounted on a switch unit 19 connected to the unit 11 and also to the microprocessor 44. The switch 22 is a two position switch that can be moved between the operate and program positions to establish the "operate" and "program" modes. The switch 23 can be moved to a number of selected positions indicated by the 1 through 5 so as to allow the particular code of a number of different transmitters to be stored in the receiver so that the receiver will respond to such codes.

In the illustrated embodiment, the receiving unit can respond to up to five different transmitters which have five different transmitting codes. FIG. 5 illustrates the code utilized in which the bit times are nominally 0.5 milliseconds for example. The data times are nominally 1, 2, 3 or 4 milliseconds.

The sync pulse is a unit measure of time. Each datum is measured with respect to the sync pulse and each datum can be 1, 2, 3 or 4 times the length of the sync pulse. The timing is from the rising edge to rising edge of adjacent pulses. Using 10 data bits the number of codes which is available is in excess of one million codes.

In the invention, each transmitter such as transmitters 26 and 28 will have a unique code which is determined by the encoder chip contained in the transmitter. The receiver unit will be able to memorize and store a number of different codes as, for example, five different transmitter codes which eliminates the need of coding switches in either the transmitter or receiver which are used in the prior art. This also eliminates the requirement that the user match the transmitter and receiver code switches.

When the garage door operator is initially installed, the switch 22 is moved to the program mode and the energize button 27 of the first transmitter 26 is depressed so that the unique code of the transmitter 26 is transmitted. This is received by the receiver 41 and decoded by the decoder 43 and supplied to the microprocessor unit 44. The switch 23 is placed in the first position, and with the switch 22 in the program mode the code of the transmitter 26 will be supplied to the memory address storage 47 and stored therein. Then if the switch 22 is moved to the operate mode and the transmitter 26 energized by depressing the transmit switch 27, the receiver 41, decoder and the microprocessor 44 will compare the received code with the code of the transmitter 26 stored in the first memory location in the memory address storage 47 and since the stored memory address for the transmitter 26 coincides with the transmitted code of the transmitter 26 the microprocessor 44 will energize the garage door operation mechanism 46 to open or close the door.

In order to store the code of the second transmitter 28 the switch 22 is moved again to the program mode and the switch 23 to the second position and the transmitter 28 is energized by depressing its transmit switch 29. This causes the receiver 41 and decoder 43 to decode the transmitted signal and supply it to the microprocessor 44 which then supplies the coded signal of the transmitter 28 to the memory address storage 47 where it is stored in a second address storage location. Then the switch 22 is moved to the operate position and when either of the transmitters 26 and 28 are energized, the receiver 41 decoder 43 and microprocessor 44 will energize the garage door operation mechanism 46 to cause the door to either move up or down depending upon its initial position. Thus, the codes of the transmitters 26 and 28 are transmitted and stored in the memory address storage 47 during the program mode after which the garage door operation mechanism will respond to either of the transmitters 26 and 28. Any desired number of transmitters can be programmed to operate the garage door mechanism as, for example, up to five transmitters can be programmed into the memory address storage 47 by using the program switch 22 and the selector switch 23.

This invention eliminates the requirement that binary switches be set in the transmitter or receiver as is done in systems of the prior art to establish a code to which the receiver will respond and the invention also allows a garage door operator to respond to a number of different transmitters because the specific codes of a number of the transmitters is stored and retained in the memory address storage 47 of this unit.

FIGS. 3 and 4 comprise the flow chart which describe both the operate and program modes of the invention. Basically, in the operate mode, a received code must match a program which has already been programmed and for four times so as to operate the garage door. This match is referred to as a valid code in the flow chart. Each valid code can be separated by up to two error codes and still have the output actuate. For example, a code of valid-error-error-valid-valid-valid would actuate the door. On the other hand, a code of valid-valid-valid-error-error-error-valid would not actuate the door.

In the program mode a code must be received four times in a row in order to be permanently stored. Any error code will reset the valid code counter.

with reference to the flow diagrams of FIGS. 3 and 4 if it be assumed initially that the switch 22 is in the operate position an incoming signal will be supplied to terminal A in FIG. 3 and an output will be supplied to terminal B which indicates that the switch 22 is not in the program mode but in the operate mode. Terminal B is illustrated in FIG. 4 and the microprocessor compares the incoming code with any codes in the five code locations stored in the memory address storage 47. If these codes match then the error counter is cleared and all other valid counters. If the valid counter receives the code four times than output is supplied to the terminal C which operates the garage door operator. If the valid counter for the code equals less than 4, then the valid code counter is incremented until the valid code counter does not equal 4 which actuates the proper output. Relative to FIG. 4 if the input code does not match any of the five stored codes, then the error counter is incremented and when the error counter equal 3 the error counter is cleared and all valid counters are cleared.

If the switch 22 is in the program mode as shown in FIG. 3 when the incoming signal from a transmitter is received, the flow diagram is followed so as to store the new incoming program in the code location pointed to by the code location pointer 23. It is to be noted that up to five addresses can be stored in the system of the invention.

It is seen that the present invention allows a receiving system to respond to one of a plurality of transmitters which have different unique codes which can be stored in the receiver during a program mode. Each time the "program mode switch" 22 is moved to the program position, a different storage area as determined by the switch 23 can be connected so that the new transmitter code would be stored in that address. After all of the address storage capacity have been used additional codes would erase all old codes in the memory address storage before storing a new one.

Although the invention has been described with respect to preferred embodiments, it is not to be so limited as changes and modifications may be made which are within the full intended scope as defined by the appended claims.

Heitschel, Carl, Willmott, Colin, Schindler, Wayne

Patent Priority Assignee Title
10652743, Dec 21 2017 The Chamberlain Group, Inc Security system for a moveable barrier operator
10862924, Jun 30 2005 The Chamberlain Group, Inc Method and apparatus to facilitate message transmission and reception using different transmission characteristics
10944559, Jan 27 2005 The Chamberlain Group, Inc Transmission of data including conversion of ternary data to binary data
10997810, May 16 2019 The Chamberlain Group, Inc In-vehicle transmitter training
11074773, Jun 27 2018 The Chamberlain Group, Inc Network-based control of movable barrier operators for autonomous vehicles
11122430, Dec 21 2017 The Chamberlain Group, Inc. Security system for a moveable barrier operator
11423717, Aug 01 2018 The Chamberlain Group, Inc Movable barrier operator and transmitter pairing over a network
11462067, May 16 2019 The Chamberlain Group LLC In-vehicle transmitter training
11763616, Jun 27 2018 The Chamberlain Group LLC Network-based control of movable barrier operators for autonomous vehicles
11778464, Dec 21 2017 The Chamberlain Group LLC Security system for a moveable barrier operator
11799648, Jan 27 2005 The Chamberlain Group LLC Method and apparatus to facilitate transmission of an encrypted rolling code
11869289, Aug 01 2018 The Chamberlain Group LLC Movable barrier operator and transmitter pairing over a network
5781143, Jan 24 1997 PHONETICS, INC Auto-acquire of transmitter ID by receiver
5926111, Aug 29 1994 D & B Supply, Inc. Pulsed width modulated remote signalling and location identification system for summoning a service industry worker
5990828, Jun 02 1998 Lear Automotive Dearborn, Inc Directional garage door opener transmitter for vehicles
6049289, Sep 06 1996 MICROCHIP TECHNOLOGY INC Remote controlled garage door opening system
6154544, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
6243000, Feb 13 1998 Wireless rolling code security system
6275682, Aug 14 1998 RF-Link Systems Inc. RF signal transmitting device
6441719, Feb 13 1998 Remote signaling device for a rolling code security system
6611205, Jun 08 2001 Nortek Security & Control LLC Gate operator safety system
6667684, Sep 06 1996 Overhead Door Corporation; Microchip Technology, Inc. Remote controlled garage door opening system
6690796, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
6750782, Dec 21 1996 HANGER SOLUTIONS, LLC Remote control system operating with user defined code signal and a method of controlling the same
6756895, Feb 11 2002 The Chamberlain Group, Inc. Device learning mode method
6832076, Feb 11 2002 CHAMBERLAIN GROUP, INC , THE Audible diagnostic information apparatus and method
6847287, Jun 11 2001 Nortek Security & Control LLC Transmitter-receiver control system for an actuator and method
6856237, Jun 26 2000 DOORKING, INC Method and apparatus for radio frequency security system with automatic learning
6903650, May 20 2002 HRH NEWCO CORPORATION Operator with transmitter storage overwrite protection and method of use
6963267, Mar 15 2002 Wayne-Dalton Corporation Operator for a movable barrier and method of use
6990317, May 28 2002 WIRELESS INNOVATION, INC Interference resistant wireless sensor and control system
7039397, Jul 30 2003 Lear Corporation User-assisted programmable appliance control
7050794, Jul 30 2003 Lear Corporation User-assisted programmable appliance control
7068181, Jul 30 2003 Lear Corporation Programmable appliance remote control
7084781, Jul 30 2003 Lear Corporation Programmable vehicle-based appliance remote control
7088218, Jul 30 2003 Lear Corporation Wireless appliance activation transceiver
7107040, Feb 11 2002 CHAMBERLAIN GROUP, INC , THE Method and apparatus for displaying blocked transmitter information
7116242, Nov 27 2002 Lear Corporation Programmable transmitter and receiver including digital radio frequency memory
7120430, Jul 30 2003 Lear Corporation Programmable interoperable appliance remote control
7135957, Dec 19 2001 Lear Corporation Universal garage door operating system and method
7161466, Jul 30 2003 Lear Corporation Remote control automatic appliance activation
7167076, Dec 19 2001 Lear Corporation Universal garage door operating system and method
7173514, Mar 15 2002 Wayne-Dalton Corp. Operator for a movable barrier and method of use
7183940, Jul 30 2003 Lear Corporation Radio relay appliance activation
7183941, Jul 30 2003 Lear Corporation Bus-based appliance remote control
7269416, Jul 30 2003 Lear Corporation Universal vehicle based garage door opener control system and method
7280031, Jun 14 2004 HRH NEWCO CORPORATION Barrier operator system with enhanced transmitter storage capacity and related methods of storage and retrieval
7375612, Oct 07 2002 HRH NEWCO CORPORATION Systems and related methods for learning a radio control transmitter to an operator
7378964, May 04 2005 CENTRAK, INC Very low power active RFID receiver
7412056, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
7447498, Jul 30 2003 Lear Corporation User-assisted programmable appliance control
7489922, Jul 30 2003 Lear Corporation User-assisted programmable appliance control
7492898, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
7589613, Apr 03 2006 Lear Corporation Trinary to trinary rolling code generation method and system
7623663, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
7760071, Jul 30 2003 Lear Corporation Appliance remote control having separated user control and transmitter modules remotely located from and directly connected to one another
7812739, Jul 30 2003 Lear Corporation Programmable appliance remote control
7855633, Jul 30 2003 Lear Corporation Remote control automatic appliance activation
7872565, Feb 03 2006 CHAMBERLAIN GROUP, INC , THE Programmer protection method and apparatus for use with a movable barrier operator
7941846, Nov 12 2002 SOMFY ACTIVITES SA Method of securing the learning mode of a home automation device
8194856, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
8233625, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
8264322, Mar 12 1999 dormakaba USA Inc Wireless security control system
8284021, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
8581695, May 27 2009 Overhead Door Corporation Channel-switching remote controlled barrier opening system
8633797, May 17 1995 The Chamberlain Group, Inc. Rolling code security system
8665064, Mar 12 1999 dormakaba USA Inc Wireless security control system
8970345, May 27 2009 Overhead Door Corporation Channel-switching remote controlled barrier opening system
9483935, May 27 2009 Overhead Door Corporation Channel-switching remote controlled barrier opening system
Patent Priority Assignee Title
3911397,
4037201, Nov 24 1975 CHAMBERLAIN GROUP, THE, INC , A CT CORP Digital radio control
4081747, Jul 06 1976 Remote control for communication apparatus
4119896, May 28 1976 Chemical Bank Sequencing control circuit
4130738, Jun 10 1976 Bidirectional data transfer and storage system
4178549, Mar 27 1978 National Semiconductor Corporation Recognition of a received signal as being from a particular transmitter
4263536, Aug 07 1978 CLOPAY BUILDING PRODUCTS COMPANY, INC Control circuit for a motor-driven door operator
4291411, May 03 1978 Robert Bosch GmbH Remote control for radiotelephones
4305060, Feb 26 1979 Whistler Corporation of Massachusetts Decoder circuitry for selectively activating loads
4322855, Jan 24 1978 Sony Corporation Remote control apparatus
4328540, Feb 20 1980 Hitachi, Ltd. Door operation control apparatus
4385296, Jun 14 1978 Hitachi, Ltd. Remote-controlled automatic control apparatus
4418333, Jun 08 1981 Pittway Corporation Appliance control system
4422071, Jan 30 1980 ERICSSON RADIO SYSTEMS B V Paging receiver
4454509, Feb 27 1980 SUMMIT COMMERICAL GILBERLTAR CORP Apparatus for addressably controlling remote units
4464651, Apr 14 1980 INNOVATIVE HOME PRODUCTS, INC Home security and garage door operator system
4491774, Dec 30 1983 Motorola, Inc.; Motorola, Inc Control system for a radio-controlled door operator
4509093, Sep 07 1982 HULSBECK & FURST GMBH & CO KG Electronic locking device having key and lock parts interacting via electrical pulses
4529980, Sep 23 1982 CHAMBERLAIN GROUP, THE, INC , A CT CORP Transmitter and receiver for controlling the coding in a transmitter and receiver
4535333, Sep 23 1982 CHAMBERLAIN GROUP, THE, INC , A CT CORP Transmitter and receiver for controlling remote elements
4550311, Dec 02 1982 Racal Security Limited Remote sensing systems
4581606, Aug 30 1982 Disys Corporation Central monitor for home security system
4596985, Nov 27 1982 KIEKERT AKTIENGESELLSCHAFT A JOINT-STOCK COMPANY Radio-controlled lock method with automatic code change
4602357, Apr 11 1983 Ensco Inc. Coded acoustic alarm transmitter/receiver system
4633247, Feb 29 1984 Blaupunkt-Werke GmbH Remote control system for selectively activating and inactivating equipment
4638433, May 30 1984 CHAMBERLAIN GROUP, THE, INC , A CT CORP Microprocessor controlled garage door operator
4652860, Oct 11 1982 Bayerische Motoren Werke Aktiengesellschaft Security installation
4665397, Nov 01 1983 UNIVERSITY PHOTONIX, INC , A CORP OF DE Apparatus and method for a universal electronic locking system
4755792, Jun 13 1985 Black & Decker Inc. Security control system
4758835, Aug 21 1985 VDO Adolf Schindling AG System for the locking and/or unlocking of a security device
4866434, Dec 22 1988 RCA Licensing Corporation Multi-brand universal remote control
4878052, Dec 05 1987 Alltronik Gesellschaft Fur Elektronische Steuerung und Antriebe mbH Hand-held transmitter for the emission of coded electromagnetic pulses, and a receiver for receiving pulses emitted by the transmitter
4912463, Aug 09 1988 Princeton Technology Corporation Remote control apparatus
4988992, Jul 27 1989 The Chamberlain Group, Inc. System for establishing a code and controlling operation of equipment
DE2746532A1,
DE2856337,
DE2939589A1,
DE2941394A1,
EP99762A1,
EP143309A2,
EP212050A2,
EP319781A2,
EP401673A1,
EP561361A1,
EP563517A1,
GB1423126,
JP55114771,
JP5980872,
RE29525, Aug 27 1976 CHAMBERLAIN GROUP, THE, INC , A CT CORP Digital radio control
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