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Publication numberUS3728605 A
Publication typeGrant
Publication dateApr 17, 1973
Filing dateAug 26, 1971
Priority dateAug 26, 1971
Publication numberUS 3728605 A, US 3728605A, US-A-3728605, US3728605 A, US3728605A
InventorsD Purtilo
Original AssigneeChamberlain Mfg Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Automatic motor driven reversible closure operator
US 3728605 A
Abstract
An overhead control for raising and lowering garage doors and other cyclically operated devices which utilizes a unidirectional electric motor which drives an endless chain in only one direction. A follower rides on a rail and is coupled to the endless chain by a gear which engages the chain on one side so as to move the follower in a first direction. When the follower reaches the end of the rail, the gear of the follower rotates 180 DEG so as to engage the opposite side of the chain and thus move the follower in the opposite direction. The tension may be adjusted so that a door will stop or reverse when it meets resistance sufficiently firm to shift the gear of the follower.
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Description  (OCR text may contain errors)

United States Patent Purtilo AUTOMATIC MOTOR DRIVEN REVERSIBLE CLOSURE OPERATOR Dennis L. Purtilo, Waterloo, Iowa Chamberlain Manufacturing Corporation, Waterloo, Iowa Filed: Aug. 26, 1971 Appl. No.: 175,046

Inventor:

Assignee:

US. Cl. ..3l8/475, 318/266, 318/267, 318/467, 49/28 Int. Cl. ..1-l02p l/00 Field of Search ..318/475, 266, 267, 318/467; 49/28 References Cited UNITED STATES PATENTS 9/1958 Klamp t ..3l8/475 X 2,752,150 6/1956 Richmond et a1. ..318/415 X Primary Examiner-T. E. Lynch AttorneyCarlton l-Iill-et a1.

[5 7] ABSTRACT An overhead control for raising and lowering garage doors and other cyclically operated devices which utilizes a unidirectional electric motor which drives an endless chain in only one direction. A follower rides on a rail and is coupled to the endless chain by a gear which engages the chain on one side so as to move the follower in a first direction. When the follower reaches the end of the rail, the gear of the follower rotates 180 so as to engage the opposite side of the chain and thus move the follower in the opposite direction. The tension may be adjusted so that a door will stop or reverse when it meets resistance sufficiently firm to shift the gear of the follower.

16 Claims, 8 Drawing Figures PATENTEI] APR 1 7 I973 SHEET 2 [IF 3 v JNVENTOR.

. Dav/W3 Z uerma I @WA'ITORNEYS A AUTOMATIC MOTOR DRIVEN REVERSIBLE CLOSURE OPERATOR BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates in general to door controls and particularly to remotely controlled electrically operated overhead door operators.

2. Description of the Prior Art Overhead door controls which lower and raise the door between the opened and closed positions have been used in the past but they generally depend upon a reversible electric motor for their operation which runs in a first direction to close the door and in a second direction to open the door. Reversible electric motors are expensive and require relatively expensive control systems and thus the maintenance of the unit is greater than that of a unidirectional motor. Also some of the controls do not provide safety features to prevent the motor from burning out and damage to the components, or, even possible personal injury which may occur in case the door or mechanism is obstructed or other malfunction.

SUMMARY OF THE INVENTION The purpose of the present invention is to provide anoverhead door control which is powered by a unidirectional electric motor which drives a chain and which includes a follower coupled to the door such that the follower is driven in a first direction by the chain to close the door and in a second direction to open the door. The follower includes a gear with teeth such that the gear is driven to move the follower in a first direction with the gear in a first orientation until the gear reaches the end of travel or encounters an obstruction at which time the gear rotates 180 and engages the other side of the chain and is moved in the opposite direction by the chain. The invention provides a safety feature to prevent damage to components or possibl personal injury in case the door encounters an obstruction or other mechanical malfunction occurs. Also, the force required to reverse the direction of the mechanism may be adjusted to suit the particular conditions of the situation.

This invention is applicable to any cyclically operated device and is not to be limited to overhead doors although they serve as an example of the invention.

Means are provided for locking the gear in a position so that it travels away from the end of the track thus assuring that ice or other obstructions will be broken as the door starts to open or close.

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:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the garage door operator of this invention;

FIG. 2 is a side view of the garage door opener illustrating the garage door engaging an obstruction;

FIG. 3 illustrates the garage door opener of this invention engaging an obstruction;

FIG. 4 is a top plan view illustrating the garage door operator of the invention;

FIG. 5 is an enlarged sectional view taken on line V-V of FIG. 4;

FIG. 6 is an enlarged exploded view of the follower and gear mechanism of the invention;

FIG. 7 is a perspective view of one end of the guide rail; and

FIG. 8 is an electrical schematic view of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view illustrating a garage door 11 in the closed position and a garage door operator is mounted between the headwall 10 adjacent the door and a suitable support at the other end thereof and includes a rail 21 on which a follower block mechanism 12 is mounted and driven by a chain 16 that passes over sprockets 18 and 19 mounted at either end of the rail 21. A follower arm 13 is attached by bracket 14 to the door 11 {and a similar bracket to follower 12 such that as the follower 12 moves back and forth on the rail 21 relative to FIG. 1 the door 11 may be raised and lowered.; It is to be realized, of course, that the pivot mechanisms for the door are not shown since such mechanisms are conventional and are well known to those skilled in the art.

FIGS. 4 through 7 illustrate the follower and track mechaniam in greater detail. For example, FIG. 4 is a top view illustrating the gears 18 and 19 rotatably mounted on suitable shafts 24 and 26, respectively, with the chain 16 extending over the gears. A motor 140 in FIG. 8 is mounted in housing 23 and has an output shaft 24 which carries the gear 18. Housing 22 is mounted adjacent the headwall 10 and rotatably supports the shaft 26 which carries the gear 19. The follower 12 is formed with a central groove 42 in which the raised portion 33 of the rail 21 is received. The follower 12 has a gear 47 mounted thereon with five teeth 48, 49, 50, 51 and 52 which sequentially engage the chain 16. The drive tooth 50 is made of electrical con ducting material as for example metal and the teeth 48, 49, 51 and 52 are electrically insulated from the gear 47. All gear teeth may be of the same material and a protrusion 141 may be added to the side of the gear 47 to contact the contact 74. As best shown in FIG. 6, the gear 47 fits into an opening 44 of the follower 41 and over a shaft 46 which is non-rotatably mounted in the follower 41 in the opening 43. An opening 53 is formed in the periphery of the gear 47 on one side thereof for receiving overload pins 121 and 38. A pair of clutch openings 56 and 57 are formed in the top surface relative to FIG. 6 of the gear 47 and are adapted to receive clutch pin extensions 59 and 61 which are mounted in a clutch plate 58 that bears against the surface of the gear 47. The clutch plate is formed with a central opening which includes a pair of keyways 64 and 66 in which keys 62 and 63 are received for non-rotatably locking the clutch plate to the shaft 46. The keys 62 and 63 are received in keyway 67 formed in the shaft 46 thus preventing the clutch plate 58 from rotating relative thereto.

A clutch spring 68 fits over the shaft 46 between the clutch plate 58 and a washer 69 and a nut 71 is threadedly received on a threaded portion 70 of the shaft 46 to hold the assembly together.

The upwardly extending portion 33 of the rail 21 has an electrically conducting strip 34 attached to one side thereof which is contacted by a wiper contact 73 of a brush 72 insulatingly mounted on the follower 51. The brush 72 has an electrically contacting portion 74 which is engageable with the electrical conducting tooth 50 of the gear 47 when the gear 47 rotates as will be described hereafter. In other words, each time the gear 47 rotates so that the tooth 50 engages the wiper 74 of the brush 72, an electrical circuit will be completed from the conducting strip 34 to the electrically conducting rail 33 through the wiper 73, brush 72, tooth 50, gear 47, the follower body portion 41 and to rail 33. Normally the rail 33 is insulated from the conducting strip 34 and the circuit is not completed through the satellite 47 As best shown in FIG. 5, an opening 81 is formed in the groove 42 of the follower 41 adjacent the strip 34 so that electrical contact is not made between the follower 41 and the strip 34 under normal conditions.

A spring-biased overload pin 38 is mounted in the end wall 36 of the support 22 as best shown in FIG. 7 and is aligned with an opening 119 formed in the follower block 41. A similar overload pin 121 is mounted in the motor housing 23 at the opposite end of the rail 21 and is aligned with an opening 118 formed in the follower block 41. As best shown in FIG. 7, a brush 37 has one end connected to the electrically conducting strip 34 and has a portion for engaging the electrically conductive tooth 50 to complete an electrical circuit between the electrical conductor 34 and the rail 21.

As best shown in FIGS. 4 and 5, upwardly extending guide projections 82 and 84 are mounted on one side of the follower block 41 by suitable bolts 83 and 86, respectively, so as to confine the chain 16 on the top of the follower block 41 so that it is engageable with the teeth 48-52 of the gear 47. The other side of the follower block has a pair of upwardly extending chain guides 87 and 89 which are mounted to the block 41 by bolts 88 and 91, respectively.

In operation, assume that the motor which drives the drive shaft 24 and gear 18 starts to drive the gear 18 clockwise relative to FIG. 4 when the follower 12 is in the position shown in FIG. 4. At this time the pin 38 extends into the aligned opening of the block 41 and its end is received in the overload locking opening 53 of the gear 47. This assures that as the chain starts to move it will exert transverse force on the drive tooth 50 of the gear 47 thus moving the actuating mechanism 12 to the right relative to FIG. 4. As soon as the block 41 moves so that the locking pin 38 is out of the aligned opening 53 of the gear 47, the gear is no longer locked by the pin from rotating relative to the block 41. However, the clutch plate 58 is locked to the shaft 46 and the clutch pins 59 and 61 are pushed by the spring 68 into the clutch openings 56 and 57 of the gear 47 which will allow the gear 47 to drive the block 41 as the chain 16 moves. The drive mechanism 12 will move on the track 21 until the surface 35 of the housing 23 is engaged by the block 41 which limits its motion to the right relative to the figure. The overload pin 121 will move into the opening 118 of the block 41 but it will not lock the gear 47 so that it cannot rotate because the locking opening 53 is on the opposite side of the gear 47 at that time and the pin 121 will be depressed against its biasing spring by the gear 47. Since the block 41 can move no farther to the right relative to the housing 23 since it bears against the face 35, the chain 16 will continue to move as shown by the arrow 'of FIG. 4 and the drive teeth 48-52 will rotate the gear 47 such that the drive tooth 50 engages the opposite side of the chain 16 so that the follower mechanism 12 will be driven to the left relative to FIG. 4. It is to be realized that the gear 47 has one tooth missing; this tooth is missing at the position of the gear opposite the position of the drive tooth 50 such that when the drive tooth 50 engages the chain 16 the gear will be driven by the side of the chain which is engaged by the tooth 50 and the opposite side of the chain will slip in the opposite direction past the gear since no tooth is present at that position.

The clutch plate 58 and clutch pins 59 and 61 lock the gear 47 in one of two positions spaced 180 apart which positions cause the follower mechanism to be driven to the left or right relative to FIG. 4 depending upon the position of tooth 50. The tension for overcoming the clutch spring is adjustable with the nut 71 so that the tighter the spring 68 is compressed the more force will be required to move the gear through th 180 shifting position.

FIG. 8 is an electrical schematic for the invention and comprises a transmitter 127 which has an antenna 129 and an energizing button 128. Thus to actuate the garage door opener the button 128 is depressed thus radiating a signal which is received by a receiver 103 having an antenna 131 to actuate a self-holding relay 104. The receiver 103 is connected to power lines 101 and 102 and the relay 104 momentarily closes the switch S1 which has a holding coil 106 connected to power line 101. The switch S1 completes the circuit to the motor through leads 107, switch S2 which is normally held closed by spring 111, lead 108 and lead 109. Thus, when the receiver produces an output to energize the relay 104 and momentarily closes switch S1 the holding coil 106 holds the switch S1 in the closed position and the motor 140 starts to run. Since the motor is a unidirectional motor it always runs in the same direction thus driving its output shaft 24 and the chain 16 through the drive gear 18. If the door operator mechanism 12 is assumed to be closed at the starting time it will then move to the right relative to FIG. 8 opening the door of the garage. When the door actuator mechanism 12 of the invention moves to the right end of the rail relative to FIG. 8, the follower block 41 will engage an electrical contact which completes the circuit between the rail 21 and the conducting strip 34. A stop relay 98 has one side connected to the power terminal 102 and the other side connected to the strip 34 and the contact 37 mounted at the rail 21. The rail 21 is connected by lead 96 to the other power terminal 101. Thus when the follower block 41 closes the circuit between strip 34 and the rail 33, the dropout relay 98 will be energized opening switch S2 against the spring 11 1, thus turning off power to the motor 140 which will stop. Simultaneously the switch S1 will drop out since its holding coil 106 is no longer energized through the switch S2. The contact 37 is mounted so that it only momentarily engages the conductive tooth 50 to apply a pulse to the dropout relay 98 and the follower block 41 does not make continuous contact between the rail 21 and the strip 34 when in the off position at the ends of the rail.'In other words, the follower block merely momentarily closes the circuit between the rail 21 and the strip 34 to pulse the drop-out relay 98 to turn off the motor but does not hold the drop-out relay energized. The switch S2 closes due to the spring 111 after the switch S1 is open.

Thus the garage door will have moved from the closed to the opened position with the follower block 41 against the wall 35 of the housing 23. As the motor 140 comes to a stop the gear 47 may commence or completely turn so that the driving tooth 50 moves from engagement with the first side of the chain 16 to engagement with the second side before the motor 140 stops completely. On the other hand if the gear 47 has not completely moved from the first to the second locked position, it will complete such movement when the motor 140 is energized a second time. The motor is energized a second time by pulsing the transmitter 127 with the button 128 or alternatively by manually depressing the push button 126 to close the switch S3 which is connected through a holding coil 114 and lead 112 to power lead 101. The opposite side of the switch S3 is connected to the lead 107 through a lead 113. Closing switch S3 completes the circuit to the motor 140 through the normally closed switch S2 and the motor will start to run in the same direction as before. This will complete the rotation of the gear 47 if it had not been completely rotated such that the tooth 50 engages the second side of the chain 16 and as the rotation is completed the locking pin 121 will move into the opening 118 of the follower block 41 and into the locking opening 53 of the gear so as to prevent it from moving until the follower block moves to the left relative to FIG. 8 and the pin 121 moves out of the opening 53.

The motor 140 will continue to run moving the garage door actuating mechanism 12 to the left relative to FIGS. 4 and 8 until the garage door is closed and the follower block 41 momentarily completes the circuit through wiper contact 37 from the strip 34 to the rail 21 thus pulsing the drop-out relay 98 which opens switch S2 thus stopping the motor 140. The switch S3 will open since the holding coil 114 is de-energized when the switch S3 opens and the associated spring opens the switch contact S3.

Thus, each time the transmitter 127 is energized by depressing the button 128, the garage door will be actuated to move either from the closed to the opened or from the opened to the closed position. After the operation has been completed, the motor will be deenergized and the door will be in the commanded position. The commands may also be given by the push button switch 126 which may be mounted in the garage to manually operate the door.

When the electrically conducting tooth 50 engages the contact 74 of the brush 72, an electrical circuit is completed between the strip 34 and the rail 21 which pulses the drop-out relay 98. The purpose of this switch 6 is to cause the door operator to stop when it starts up and encounters an obstruction as illustrated in FIG. 3.

When the door 11 engages an obstruction 32 which prevents it from raising further, the chain 16 will continue to move driving the gear 47 to the reverse position such that the driving tooth 50 moves to momentarily engage the contact 74 thus completing a circuit from the rail 21 through the tooth 50, the contact 74, the brush 72 and the contact 73 to the electrical conducting strip 34, thus causing the drop-out relay 98 to be energized opening the switch S2 and causing the motor to stop. Thus the motor 140 will stop when an obstruction is encountered as the door is being opened because the gear completes an electrical circuit to the drop-out relay 98 as the gear is driven from a first to a second locked position.

Alternatively, if, as shown in FIG. 2, an obstruction 31 is encountered as the door is being lowered from the opened to the closed position, the motor will not be stopped since the electrical conducting tooth 50 does not complete the circuit between the rail 21 and the electrical conducting strip 34 as the gear rotates because the tooth does not engage the contact and thus the motor will continue to run returning the door to the full up position before the motor is turned off by engagement of the follower'block 41 with the contact 74.

The locking pins 38 and 121 prevent the gear 47 from rotating at the initiation of movement as for example when the door is slightly frozen to the ground and greater than normal force is required to break the door from the ice. As soon as the door starts to move, the overload pins move out of engagement with the gear and the gear is free to rotate if a resisting force is encountered greater than that established by the setting of the clutch spring 68 by the nut 71.

It is seen that this invention provides a simple and compact garage door operator and although it 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 intent and scope as defined by the appended claims.

Iclaim:

1. An operator for a cyclically operated device comprising:

a rail mounted above said device;

a follower movable on said rail and connected to said device to control its position;

an endless chain belt movably mounted with first and second sides of said belt on opposite sides of said rail;

a unidirectional driving means connected to drive said endless belt in one direction; said follower formed with guides for slidably engaging said first and second sides of said belt,

gear engaging means comprising a gear rotatably mounted on said follower and having at least one tooth engageable alternatively with said first and second sides of said belt, and clutch means mounted on said follower between said gear and said follower to prevent said gear from rotating relative to said follower unless a predetermined torque is applied to said gear by said belt.

2. An operator for a cyclically operated device according to claim 1 wherein said guide means on said follower hold said belt in engagement with said one tooth of said gear.

3. An operator for a cyclically operated device according to claim 1 including a pair of stop means mounted at opposite ends of said rail and engageable with said follower to limit its motion.

4. An operator for a cyclically operated device according to claim 3 wherein said gear has five teeth spaced about the surface of the gear at 60 intervals and with a 120 gap formed between two of said teeth and said one tooth having teeth spaced at 60 and 120 on either side thereof.

5. An operator for a cyclically operated device according to claim 1 wherein said gear has a depression and said clutch means includes a clutch plate nonrotatably mounted relative to said follower and said clutch plate has a clutch pin receivable in said depression of said gear.

6. An operator for a cyclically operated device according to claim 5 further including a clutch spring engageable with said clutch plate to bias it toward said gear.

7. An operator for a cyclically operated device according to claim 6 further including means for adjusting the spring tension on said clutch spring.

8. An operator for a cyclically operated device according to claim 4 including a pair of overload pins each mounted on said stop means and said gear formed with an opening into which an overload pin may be received after said follower has engaged one of said stops and said gear has rotated 180.

9. An operator for a cyclically operated device according to claim 8 wherein said follower is formed with a pair of openings at opposite ends which align with said overload pins and said opening in said gear into which said overload pins are received.

10. An operator for a cyclically operated device according to claim 9 wherein said overload pins are flexibly mounted in said stop means for movement in said one and opposite directions.

11. An operator for a cyclically operated device according to claim 4 comprising a control means including means for energizing said unidirectional driving means, and first and second means for de-energizing said driving means mounted at opposite ends of said rail and respectively actuated by said follower when it reaches either end of said rail.

12. An operator for a cyclically operated device according to claim 11 further including third means for de-energizing said driving means when said gear rotates intermediate the ends of said rail due to an overload condition.

13. An operator for a cyclically operated device according to claim 12 wherein said driving means is an electrical motor and said first, second and third deenergizing means includes electrical switches connected in parallel, a drop-out relay connected in circuit with said switches, and a stop switch connected in circuit with said electrical motor and said stop switch controlled by said drop-out relay.

14. An operator for a cyclically operated device according to claim 13 wherein a protrusion on said gear is engageable with said third de-energizing switch to actuate it.

15. An operator for a cyclically operated device according'to claim 14 wherein said energizing means includes a remote controlled switch connected in circuit with said electrical motor to energize it.

16. An operator for a cyclical y operated device according to claim 15 including a radio transmitter and receiver for energizing said remote controlled switch.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2752150 *Nov 28, 1952Jun 26, 1956Richard D HolmesGarage door operator
US2851266 *Jul 13, 1956Sep 9, 1958Klamp WilliamDoor operator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4006392 *Sep 2, 1975Feb 1, 1977Catlett John CElectronic sliding door
US4274227 *Aug 30, 1979Jun 23, 1981Chamberlain Manufacturing CorporationObstruction sensor for electro-mechanically operated garage doors
US5228492 *Jul 8, 1991Jul 20, 1993Jou Ming SenElectric rolling steel door safety stopping device
US5929580 *Aug 5, 1997Jul 27, 1999Wayne-Dalton Corp.System and related methods for detecting an obstruction in the path of a garage door controlled by an open-loop operator
US6161438 *Oct 20, 1998Dec 19, 2000Wayne-Dalton Corp.System and related methods for detecting a force profile deviation of a garage door
US6326751Aug 25, 1999Dec 4, 2001Wayne-Dalton Corp.System and related methods for detecting and measuring the operational parameters of a garage door utilizing a lift cable system
US8127494Sep 3, 2008Mar 6, 2012Cornell Iron Works, Inc.Self adjusting track chain adjustment trolley
US8375635Aug 26, 2009Feb 19, 2013Richard HellingaApparatus for opening and closing overhead sectional doors
EP0561091A1 *Mar 16, 1992Sep 22, 1993Jean Paul CoronOpening and closing device for garage doors, gates and similar closures
WO1992022723A1 *Jun 11, 1992Dec 23, 1992Chamberlain Group IncChain guide for overhead door operator
Classifications
U.S. Classification318/475, 49/28, 318/267, 318/467, 318/266
International ClassificationE05F15/00, E05F15/16
Cooperative ClassificationE05Y2900/106, E05Y2800/00, E05F15/0017, E05F15/1653
European ClassificationE05F15/16B9B, E05F15/00B4
Legal Events
DateCodeEventDescription
Mar 3, 1988ASAssignment
Owner name: CHAMBERLAIN GROUP, THE, INC., 845 LARCH AVENUE, EL
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CHAMBERLAIN MANUFACTURING CORPORATION;REEL/FRAME:004856/0800
Effective date: 19880223
Owner name: CHAMBERLAIN GROUP, THE, INC., A CT CORP.,ILLINOIS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHAMBERLAIN MANUFACTURING CORPORATION;REEL/FRAME:4856/800
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHAMBERLAIN MANUFACTURING CORPORATION;REEL/FRAME:004856/0800