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`W. KLAMP
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`2
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`,887,31 1
`
`DOOR OPERATOR AND CONTROL THEREFOR
`
`2 Sheets—Sheet 1
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`
`Filed April 4, 1957 _
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`INVENTOR.
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`WILL MM A’LAMP
`
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`

`,
`
`May 19, 1959
`
`W. KLAMP
`DOOR OPERATOR AND CONTROL THEREFOR
`Filed April-4,
`1957
`2 Sheets-Sheet 2
`
`2,887,311
`
`108
`
`121
`
`125"
`
`70---
`
`148 -;:
`
`riG.7
`
`1 .
`
`INVENTOR.
`WILLIAM Kl.AMP
`_ /":: BY��-'.
`�� ���
`Arro,<;>NEYS
`
`

`

`
`
`United States Patent Office 2,887,311
`
`Patented May 19, 1959
`
`1
`
`2,887,311
`
`DOOR OPERATOR AND CONTROL THEREFOR
`
`William Klamp, Rocky River, Ohio
`
`
`
`Application April 4, 1957, Serial No. 650,663
`
`29 Claims. (Cl. 268-59)
`
`'
`\
`
`2
`being grounded by a part moved in response to the door
`meeting an obstruction.
`A further object of the present invention is the pro­
`
`
`vision of a new and improved door operating mechanism
`5 in which a relay is alternately
`actuated to first and second
`
`
`positions to respectively start and stop the motor by
`
`
`successive momentary energizations thereof and in which
`
`a switch is actuated by the operating mechanism, pref­
`
`erably once during each cycle of door operation, to actu-
`10 ate the motor control relay from its immediate position
`to its other position if the relay is energized when the
`switch is operated.
`A still further object of the present invention is to
`
`
`provide a door operating mechanism of the character set
`15 out above in which the motor is controlled
`The present invention relates to door operators and par­
`
`
`by a relatively
`
`
`ticularly to the controls therefor.
`
`
`
`low voltage control circuit including a two-position ratchet
`
`
`Door operators generally comprise a motor which is
`
`
`type relay having motor-stop and motor-run positions and
`
`connected to reciprocate a carriage to effect the opening
`contacts which ground one side of the low voltage power
`
`supply when the relay is in its motor-run position and in
`and closing of a door connected to the carriage and are
`20 which means is provided for momentarily connecting
`the
`
`commonly constructed so that if a fault occurs in the
`control circuit which maintains a control relay for the
`relay coil ·across the power supply to actuate the relay
`and in which the motor is stopped at the limits of move­
`
`motor continuously energized, the motor will be contin­
`uously energized and in many types of operators the
`
`ment of the door by connecting one side of the relay to
`
`
`prevented in the event ground and continuous operation
`
`motor will operate to repeatedly open :and dose the door
`25 of a short circuit which maintains
`operated thereby. When such a fault occurs, the usual
`
`the relay energized on
`
`
`
`starting by momentarily short circuiting the relay, pref­
`
`limit and other control means are rendered ineffective to
`
`erably once during each cycle of door operation, at a
`stop the motor.
`
`time the relay should, under normal operation, be de­
`Furthermore, the door operators of the prior art have
`
`
`
`
`not been constructed to operate satisfactorily when the
`energized.
`30 The present invention
`also contemplates the provision
`
`
`door meets an obstruction during its closing movement.
`
`
`of a new and Lmproved simplified door operating mecha­
`
`In the majority of operators the obstruction must exert
`
`sufficient force to effectively ·stall the motor before the
`ni,sm in which the motor for driving the operator is re­
`
`
`versed in ·response to the actuation of contacts which
`
`motor will reverse or the construction is such that the
`
`operate independently of motor speed when the door
`motor merely stops mther than reverses. In still other
`35 meets an obstmction,
`the mechanism being so constructed
`
`ope,rators the safety controls in the event of the door
`
`
`
`meeting an obstruction are not entirely 'satisfactory for
`and arranged that it will have a long life and does not
`
`
`require a flexible electrical connection to the door in
`
`
`various reasons, such a's requiring the use of flexible elec­
`trical cable to the door, or failing to operate for all types
`order that the mechanism will reverse in response to all
`types of small forces which oppose the closing of the
`of obstructions.
`40 door.
`An important object of the present invention is to
`The present invention further contemplates a door op­
`
`
`
`provide a new and improved door operating mechanism
`
`
`erating mechanism as set out in the preceding paragraph
`of the type referred to but in which the motor is not sub­
`in which the parts of the mechanism are not called upon
`
`
`
`ject to continuous energization due to f,aults which would
`to stall the motor when the door meets an obstruction,
`normally maintain the motor control relay in a condition
`45 even though certain of the limit means and control ele­
`whereby the motor is energized.
`ments are rendered ineffective.
`
`Another object of the present invention is to provide
`
`Furthermore, it is an object of the present invention
`
`a new and improved door operating mechanism of the
`
`to provide a new and improved door operating mecha­
`
`type referred to but which will not operate continuously
`
`nism 1n which the control circuit thereforis so constructed
`
`
`or be continuously energized even though the relay coil
`
`50 and arranged that the inertia of the door does not 'present
`
`of the motor control relay is maintained in an energized
`a control problem and does not Iimit the maximum size
`
`
`condition upon the actuation thereof to start the motor,
`
`of motor which oan be used to drive the operator, the
`by a £ault which renders the door limit means ineffective
`
`control circuit being such that it is not conditioned to
`
`to de-ene.rgize or actuate the relay to its motor "stop"
`
`reverse the motor on the next start until the inertia of
`position.
`55 the door has been overcome.
`Yet another object is to provide a door operating mech­
`
`The invention resides in certain constructions and com­
`
`
`anism of the type referred to in which a switch is actu­
`
`ated in relationship to the movement of the door operat-
`
`
`binations and arrangements of parts and further objects
`
`ing carriage through its door operating cycle, the switch
`
`and advantages thereof \vill be apparent from the follow­
`being effective to stop the motor in the presence of a
`of the preferred embodiment
`ing detailed description
`60 made with reference
`fault that maintains the motor control ,relay in a condi­
`
`to the 'accompanying drawings form­
`
`tion where the motor is continuously energized.
`ing a part of this 'specification
`for all matter shown
`Another object of the present invention is to provide
`
`
`and in which: therein, whether or not expressly described,
`
`a door operating mechanism of the type referred to in
`Fig. 1 is a plan view of a door operating
`mechanism
`
`which the motor control circuit is conditioned imme­
`embodying the present invention;
`diately after the motor is started to effect operation in 65
`Fig. 2 is a vertical
`
`sectional view taken approximately
`
`
`the reverse direction when the starting winding of the
`along line 2-2 of Fig. 1;
`motor is next energized and in which means is provided
`
`Fig. 3 is a fragmentary
`
`sectional view taken approxi­
`
`
`for effecting energization of the starting winding to re­
`mately along line 3-3 of Fig. 1;
`verse the motor in response to the door striking an object
`
`70 Fig. 4 is a fragmentary
`detailed view showing the sup-
`
`
`
`in its closing movement, which means preferably com­
`
`port for the safety cable used with the preferred and
`
`
`prises an uninsulated conductor extending �along the path
`
`
`of movement of the door-operating carriage, the cable
`
`illustrated embodiments;
`
`

`

`2,887,811
`
`/"
`,
`
`3
`Fig. 5 is a sectional
`embodiment, to define a right
`bent, in the illustrated
`view through a safety switch em­
`angle as is shown in Fig. 2. The door 11 is a conven­
`bodied in the mechanism shown in Fig. 1;
`tional overhead door which is comprised of horizontal
`Fig. 6 is a fragmentary
`view taken approxi­
`sectional
`mately along line 6-6 of Fig. 2; and
`sections hinged together and which is guided for move­
`Fig. 7 is a simplified control circuit for the motor or 5
`ment by guide channels disposed along the opposite side
`edges of the door and extending along the path of move-
`mechanism.
`the door operating
`ment of the door. The door 11 and the guide channels
`The preferred embodiment of the present invention
`therefor are not shown or described in detail since they
`the provision of a door operating mech­
`contemplates
`do not, per se, form a part of this invention and since
`to operate the
`anism including switch means actuatable
`those
`are well known to
`the details of their construction
`to a stop condition if the relay is 10
`motor control relay
`skilled in the art.
`in an energized condition at the time the switch means
`The weight of the door 11 normally causes the link
`being actuated
`the switch means preferably
`is actuated,
`21 to move to a position where the pin 22 engages the
`once during each complete cycle of door operation and
`upper end of the elongated slot 23 as the latter is viewed
`the motor control relay preferably
`being a ratchet relay
`in Fig. 2. In addition to the weight of the door 11 the
`by the actuation 15
`which is momentarily short circuited
`link 21 is urged so that the pin 22 engages the upper
`of the switch means to cause a pulsing of the relay and
`end of the slot 23 therein by a spring 27 which en­
`of the same to a stop position in the event
`the actuation
`the slot 23 and the one end
`circles the link 21 adjacent
`that the relay is energized at the time of short circuiting.
`lower ends of the flanges 20. The
`of which abuts the
`The broader aspects of the present invention contem­
`plate the provision of safety means which is actuated in 20
`spring 27 is held compressed against the lower ends of
`the flanges 20 by a bolt 28 supported in an opening in
`to the door opening and closing cycle to
`relationship
`the link 21 and extending through the coiled spring 27
`stop the operation of the door in the event the control
`thereof and having a
`between adjacent convolutions
`due to a fault therein, is in such a condition
`circuit,
`head 30 at one end which engages the outer sides of
`that the motor for driving the operator will remain
`25 the convolutions
`and a wing nut 31 threaded onto the
`energized.
`continuously
`other end to engage the outer side of the convolutions
`the present invention contemplates
`the
`Furthermore,
`opposed to the point of engage­
`at a point diametrically
`provision of circuit means for reversing the door in re­
`ment of the head 30. The loading due to the spring
`in its path during its closing
`sponse to an obstruction
`27 may be adjusted by rotating the coil spring which
`movement, which circuit means is actuated independently
`to provide a 30
`of motor speed. It is also contemplated
`of the spring to ride
`will cause the helical convolutions
`on the bolt 28 in the manner of a screw to increase
`door operating mechanism where the control circuit for
`or decrease the spring load depending upon the direction
`the motor is arranged in such a manner that the inertia
`of lead· of the helical con­
`of rotation and the direction
`of the door does not present a problem. In the preferred
`volutions. The slot 23 and the spring 27 cooperate to
`embodiment, the reversing circuit for the motor is not
`to operate the motor in the reverse direc-35
`occur between the link
`permit a relative movement to
`conditioned
`21 and the carriage 10 when the door meets an obstruc-
`tion on the next start until the motor has operated a
`closing movement. This relative move­
`tion during its
`sufficient time to overcome the effects of door inertia.
`the carriage 10 and the link 21 is used, as
`ment between
`Referring to the drawings, the door operating mech­
`anism shown therein comprises a carriage 10 connected
`to stop the move­
`will be explained in detail hereinafter,
`to an overhead door or similar closure member 11 for 40
`ment of the carriage in a door closing direction.
`the carriage 10 between
`The chain 12 for reciprocating
`closing an opening in a wall W and reciprocated
`to open
`to the open and closed positions
`its limits corresponding
`and close the door by an endless flexible member or chain
`33, 34
`of the door 11 passes around spaced sprockets
`motor in the illus­
`12 driven by a motor 13, a reversible
`mounted on shafts 35, 36, respectively, journally
`sup­
`trated embodiment.
`45
`flanges 15b, 16b of the angle mem­
`ported by the vertical
`The carriage 10 is slidably supported for reciprocation
`bers 15, 16. The sprockets 33, 34 and the chain 12
`between limits which correspond to fully open and fully
`plane with the sprocket 34 being
`are located in a vertical
`of the door 11 by a pair of spaced angle
`closed positions
`at the end of the channels 15, 16 adjacent the wall W.
`flanges 15a, 16a and
`members 15, 16 ·having horizontal
`The chain 12 has an upper run 37 and a lower run 38
`vertical flanges 15b, 16b. The angle members !5, 16
`are disposed side by side with the carriage 10 therebe-50
`to which the carriage 10 is connected. The upper run
`supported by cradles
`37 of the carriage is additionally
`tween and with the vertical flanges 15b, 16b extending
`41 carried by rods 43 extending between the vertical
`upwardly from the remote side edges of the horizontal
`flanges 15b, 16b. The cradles 41 prevent sag of the
`flanges 15b, 16b are con­
`flanges 15a, 16a. The vertical
`nected by straps Ha, 17b, 17c and 17d, which secure
`upper �·un 37 of the chain 12. The chain 12 is driven
`to move �he carriage 10 through its door opening and
`The 55
`the angle members 15, 16 in spaced relationship.
`door closmg movements by the motor 13 which is sup-
`to connect the oper­
`straps 17a and 17d are also utilized
`ported from the angle members 15, 16 at the end there­
`ating mechanism to the wall W and to other supporting
`of remote from the wall W. The motor 13 is connected
`structure for the operating mechanism.
`The carriage lil is, in the illustrated
`to drive the shaft 35 which mounts the sprocket 33
`embodiment, a
`45 having a driven· pulley 46 mounted
`through a belt drive
`flanges ].8 60
`cast body having a pair of spaced horizontal
`on the armature shaft of motor 13 and a driving pulley
`extending from each side thereof and forming a slidway
`47 fixed to an end of a shaft 48 extending between the
`flanges 15a, 16a to slidably
`which receives the horizontal
`15b, 16b and extending.
`support the carriage on the angle members 15, 16. The
`outwardly of
`vertical flanges
`flanges 2il
`journally supported for rotation by bearin"
`the latter and
`vertical
`carriage 10 also has spaced depending
`in the flanges 15b, 16b�
`to connect the carriage to the door 05
`0 respectively mounted
`membe�s
`which are utilized
`11. The carriage 10 is connected to the door U by a
`The driVIng pulley of the belt drive 45 · is fixed to the
`end portion of the shaft 48 that extends outwardly of
`link 21 which has its upper end disposed between the
`the vertical �ange 16b. The shaft 48 is, in turn, con­
`flanges 20 and which is connected to the flanges 20 by
`35 by a chain drive
`51 includ­
`nected to dnve the shaft
`a pin 22 supported by flanges and received in an elon­
`ing a sprocket 52 fixed to the shaft 48 and a sprocket 53
`gated slot 23 in the upper end of the link 21. The elon-70
`gated slot 23 permits relative movement of the link 21
`fixed to the end portion of shaft 35 which extends out-
`with respect to the carriage 10. The lower end of the
`wardly of the flange 16b. If the motor 13 is rotated
`link 21, as the latter is viewed in Fig. 2, is connected
`in one direction
`the chain 12 is moved in one direction
`connected
`to an arm 24 having its other end pivotally
`through its path to open or close the door and if the
`to a bracket 25 fixed to the door 11. The arm 24 is 75
`motor is rotated in the opposite direction
`the chain 12
`
`.5
`
`

`

`2,887,311
`6
`5
`but if held will permit the
`tiona! engagement therewith,
`through its path to actu­
`is moved in the other direction
`shaft 48 to rotate relative thereto.
`ate the door in its other direction.
`band 75 loosely encircles
`the
`The switch actuating
`As pointed out above, if the door during its closing
`sleeve 76 and has its opposite ends bent outwardly to
`the link 21 will move
`movement meets an obstruction,
`extending tab 78 for engaging and actu­
`form a radially
`to the carriage 10 to effect the stopping of the lS
`relative
`ating a switch operating member 80 for the reversing
`embodiment,
`door closing movement. In the illustrated
`switch 68 being disposed im­
`switch 68, the reversing
`the upper end of the link 21 is in engagement with a lever
`mediately below the shaft 48 in a control box 81 sup­
`55 which is supported in a depending manner by a leaf
`of the angle members 15, 16
`ported from the underside
`spring 56 having one end thereof fixed to the upper side
`and having housed therein the controls for the motor 13
`of the body of the carriage 10. The lever 55 extends 10
`70. The
`mounting the safety switch
`and additionally
`downwardly from the leaf spring 56 through an opening
`band 75 is caused to move with the
`switch actuating
`to engage the link 21. Upon
`in the body of the carriage
`switch 68 by a spring
`sleeve 76 to actuate the reversing
`movement between the link 21 and the carriage
`relative
`portion
`G2 coiled on the sleeve 76 and having a straight
`10 against the action of spring 27, the lever 55 will be
`its ends which passes over the switch
`83 intermediate
`moved upwardly to cause the free end of the leaf spring 15
`band 75' and joins the portions of the spring
`actuating
`56 to move upwardly into engagement with a conductive
`of the band. The ends
`disposed on the opposite sides
`member or cable 58 extending along the path of move­
`of the spring 82 abut the collars 77 and the frictional
`ment of the carriage 10 adjacent the upper side of the
`engagement of the spring with the sleeve 76 is such that
`at its opposite ends
`carriage. The cable 58 is supported
`the sleeve and spring will move as a unit. The straight
`the angle members 20
`by the straps 17b, 17c connecting
`portion 83 of the spring 82 is such that it can move
`15, 16. The end of the cable 58 adjacent the wall W
`to the arcuate portion of the band between the
`relative
`which com­
`is connected to the strap 17b by a connection
`opposite sides of the tab 78. Assuming that the switch
`prises a spring 60 having one end connected to the strap
`68 is in the position shown in Fig. 2 with the switch
`17 b and its other end received in an opening in an in­
`member SO ·being thrown to the right as viewed
`operating
`the 25
`for receiving
`sulator ·61 which has another opening
`side
`therein and with the tab 78 engaging the left-hand
`61 insulates
`end of cable 58. The insulator
`right-hand
`portion 83 being in
`of the member 80 and the straight
`the cable from the strap 17 b of the framework of the
`side of tab 78 of the band,
`engagement with the left-hand
`end, of
`operating mechanism. The other, or left-hand
`with the switch at the de­
`and if the motor is operating
`the cable 58, as the latter is viewed in the drawing, is con­
`in a counterclock­
`the shaft 48 is rotating
`scribed position,
`therefrom. The 30
`nected to the strap 17c and is insulated
`as viewed in Fig. 2, which tends to move
`wise direction
`of rods
`spring 60 urges the cable against the underside
`the sleeve 76 and the spring thereon in a counterclockwise
`from the rods by
`43. The cable, however, is insulated
`. Movement of the sleeve 76 and the spring
`direction
`supported on the rods.
`sleeves 63, coaxially
`insulating
`however,
`is prevented,
`direction
`82 in a counterclockwise
`embodiment the control
`and illustrated
`In the preferred
`portion 83 of the spring
`by engagement of the straight
`for the motor 13 is arranged so that when the leaf 35
`circuit
`with the tab 78 which is, in turn, held against movement
`spring 56 is moved into engagement with the cable 58
`switch
`member SO of the reversing
`by the switch operating
`of operation to
`the motor 13 will reverse its direction
`68. With the switch in the position referred to, the
`cause the door 11 to move in the opposite direction.
`the next time the start winding is
`motor 13 will operate,
`for the motor 13 is shown schemat­
`The control circuit
`to move the shaft clockwise
`to
`in a direction
`energized,
`in addition to the safety 40
`ically in Fig. 7 and includes,
`When the
`10 in the opposite direction.
`drive the carriage
`switch 68 and a safety
`cable 58, a limit bar 67, a reversing
`move­
`motor is next started it will be seen that clockwise
`from the strap
`switch 70. The limit bar 67 is supported
`ment of the shaft 48 will cause the sleeve 76 and the spring
`therefrom.
`17c and is insulated
`82 to move clockwise with the shaft since the straight
`When the carriage 10 is in its position corresponding
`portion 83 of the spring is free to move in a clockwise
`of the door 11 the limit bar 45
`to the fully closed position
`away from the tab 78. After the shaft 48 has
`direction
`67 is engaged by a lug 71 on the upper run 37 of the
`in the clockwise direction
`the
`moved one revolution
`10 is in its position cor­
`chain 12 and when the carriage
`83 of the spring will engage the right·
`straight portion
`of the door 11 the
`to the fully open position
`responding
`hand side of the tab 78 as the latter is viewed in Fig.
`limit bar 67 is engaged by a •lug 72. The lug 72 is nor­
`2 to cause the tab to move with the spring and sleeve 76.
`mally on the lower run of the chain 12 but just prior to 50
`The tab 78 and the band 75 will move clockwise
`with
`its engagement with the limit bar 67 moves around the
`the sleeve 76 away from engagement with the switch
`end of
`sprocket 33 to engage the rearward, or left-hand
`operating
`member 80 of the switch 68 until the tab 78
`the limit bar, as the latter is viewed in the drawings.
`has completed approximately
`a full revolution
`and en­
`Engagement of the limit bar 67 by either the lug 71 or
`gages the other side of the switch actuating
`member 80.
`the lug 72 grounds the bar and causes the motor 13 55
`Continued clockwise
`rotation of the shaft
`48 after re­
`to stop.
`engagement of the tab 78 and the member 80 will cause
`The motor 13 is of the type in which the direction
`of
`the tab 78 to throw the switch to its other or left-hand
`motor rotation depends upon the phase relationship
`of
`position
`as viewed in Fig. 2 to condition
`the motor ener­
`the current in a start winding 73 of the motor with respect
`to the current in a main motor winding 7 4 and in the 60
`gizing circuit to start the motor in the opposite direction
`the next time the start winding 73 is energized.
`It can
`embodiment is a split phase motor. The start
`illustrated
`now be seen that the sleeve 76, the switch actuating
`band
`after the motor reaches
`winding is cut out immediately
`and the spring 82 function to throw the reversing
`switch 68 of the
`speed. The reversing
`a predetermined
`75,
`swrtch 68 approximately
`two revolutions
`after the start
`control circuit controls the sense of the current in the
`.
`of th� ?JOtor 13. As is apparent from the following
`start winding and is operated each time the motor is 65
`descnptiOn,
`the throwing of reversing
`switch 68 condi­
`circuit so that
`the motor energizing
`started to condition
`tions the motor 13 to start in the opposite direction
`the
`of the start winding the motor
`upon the next energization
`next time the start winding of the motor is energized.
`of the motor in the opposite direction.
`will effect operation
`. Referring
`to the control circuit shown schematically
`The throwing of the switch 68 each time the motor starts
`in
`F]g: 7,
`the motor 13 includes a centrifugal
`switch 87,
`band 75 which en-70
`by a switch actuating
`is accomplished
`whrch rs operated to an open position
`to de-energize
`the
`compasses a sleeve 76 of fibrous material on the shaft 48.
`start w!nding 73 after the motor has come up to a pre­
`The sleeve 76 has collars 77 at its opposite ends which
`determmed speed. The motor 13 is designed to operate
`abut collars fixed to the shaft 48. The sleeve
`respectively
`�t the voltage of the available
`power supply which is,
`76 will rotate with the shaft 48 by reason of the fric-75
`m the case of garage door operators,
`most commonly
`
`.
`
`

`

`2,887,311
`
`g
`1
`connecting the wire 125 and, in tum, the terminal 116
`110 volts. In the circuit of Fig. 7 conductors Ll, L2
`of the secondary coil 111 to ground. With the contacts
`are the opposite sides of the power supply and the start­
`127 closed and the terminal 116 of the secondary coil
`the source
`ing winding 73 of the motor is energized from
`111 connected to ground the relay coil 91 is energized
`by a circuit which includes the reversing switch 68 and
`5 whenever the wire :1.23 is grounded. The wire 123 is
`normally open contacts 90 of a motor control relay 91
`connected to the limit bar 67 by a wire 128 and each
`switch 87. The motor
`in addition ·to the centrifugal
`time one of the lugs 71, 72 hits the bar, the latter and,
`93, 94, 95 which
`switch 68 has three terminals
`reversing
`in tum, the wire :!.23 are grounded to energize the relay
`connected to terminals 96, 97, 98 on
`are respectively
`the one hand if the switch operating lever 80 is thrown
`91, if the relay is de-energized,
`and to cause the latter
`10 to operate
`to its position where the contacts 90, 127
`connected to
`to one position and which are respectively
`are open. As soon as the relay operates to open the
`terminals 160, 101 and 102 on the other hand if the
`contacts 127 the circuit between the terminal 116 and
`switch operating lever 80 is thrown to its other position.
`and,
`ground is broken and the relay 91 de-energized
`The terminal 97 is connected to one side of the start
`of the
`by the depression
`again energizable
`therefore,
`winding 73 by a wire 103 connected to one contact of
`15 switch 118 to start the motor when desired. It will be
`87 and a wire 104 connected from
`the centrifugal switch
`noted that the motor 13 may also be stopped by depress­
`the other contact of switch 87 to the winding 73 while
`US which will cause the ener­
`ing the push-button switch
`the terminal 98 is connected to the other side of the
`start winding 73 by a wire 105. The terminals 1111, 102
`gization of the relay 91 to actuate the latter.
`mechanisms for
`It is not uncommon in door operating
`to the ter­
`are connected by bridging wires respectively
`20 a fault to occur which maintains the motor control relay
`minals 97, 98 so that when the switch is in one position
`91. in an energized position once the latter has been ener­
`the terminal 94 is connected to the wire 103 and to one
`gized to start the operation of the motor 13. It will be
`side of the starting winding 73 and when the switch is
`apparent from the control circuit that if the relay 91
`in. the other position the terminal 94 is connected to the
`is maintained in an energized condition after the motor
`wire 105 and to the other side of the starting winding
`25 1.3 is started, the motor 13 will continue
`to run regard­
`73. The terminal 95 is, of course, connected to the other
`less of the operation of the lugs 71, 72 to ground the
`one of the wires 103, 105 depending upon the position
`wire 123 since the grounding of the wire 123 would only
`of the switch. The terminal 94 is bridged to the termi­
`nal 93 which is, in tum, connected to Ll.
`the already ener­
`complete a second circuit for energizing
`gized relay 91. In this condition the motor 13 would
`The terminal 95 of the reversing
`switch is connected
`30 operate continuously
`operator,
`the
`and, in the illustrated
`to L2 by a circuit including wire 106 connected to the
`open and close, since the motor
`door would repeatedly
`terminal 95, wire 107, wire 108, the contacts 90 of relay
`91 and wire 1:10 connected to L2. The main winding
`at the door open limit of the carriage
`speed will reduce
`7 4 of the motor 13 has one side connected to Ll and
`switch 87 will close and
`to a point where the centrifugal
`the same will occur at the door closing limit or the cable
`the other side. connected to wire 106 which is, as above
`35 58 will be engaged by the leaf spring 56 to reverse the
`connected to L2 through the contacts 90 of
`described,
`motor as is explained in detail hereinafter.
`ratchet relay 91.
`One feature of the present invention is the provision
`The opening and closing of the contacts 90 of the relay
`of the safety switch 70 which is actuated preferably
`once
`91 control the starting and stopping of the motor 13.
`during each complete cycle of door operation, and will
`When the contacts 90 are closed, current is supplied to
`40 function to stop the motor 13 if the relay 91 is energized
`switch 68 and
`the start winding 73 through the reversing
`at the time the switch 70 is actuated. The safety
`switch
`switch 87 and to the main winding 74.
`the centrifugal
`70 is connected between the terminal 115 of the second­
`The sense of the current flow in the start winding 73
`ary coil 111 and ground and when actuated completes
`switch
`which is determined by the position of reversing
`a short circuit to ground around the operating coil of the
`68 determines
`of rotation of the motor 13
`the direction
`45 relay 91. If the relay 91 is energized the short circuit
`switch 87
`the centrifugal
`and after the motor· has started
`cause
`completed by the safety switch 70 will effectively
`73. The
`opens to break the circuit to the start winding
`of the relay and when the switch 70
`the de-energization
`motor will continue to run as long as the contacts 90
`is again opened the fault which maintains the relay 91
`remain closed. The relay 91 is of the type known as a
`in an energized condition will again energize the relay
`ratchet relay or holding relay and when energized to
`50 and cause its actuation
`to its position where the contacts
`close the contacts 90 the relay remains in its position
`90, 127 are open. If the fault does not cause the re­
`with the contacts 90 closed when de-energized
`and until
`of the relay 91 for some reason or other,
`energization
`it is again energized. The subsequent energization
`of
`the lug 71 or the Jug 72, whichever one next strikes the
`the relay causes it to operate to its position with the
`limit bar 67, will cause the energization
`contacts 91} open and to remain in this position upon
`of the relay 91
`5'5 to stop the operation of the motor 13. The safety switch
`of the relay and until the
`subsequent de"energization
`70 is mounted on the box 31 adjacent the sprocket 33
`relay is again energized. The relay 91 is a low voltage
`the wire 121 by
`and is actuated to a position· grounding
`relay and is part of a low voltage control circuit ener­
`gized from a secondary coil 111 of a step-down trans­
`the engagement of the lug 72 with a plate member 130
`former 112 having a primary 113 connected across Ll,
`of the switch when the lug 72 is moving in a door onen-
`The lug 72 as it moves by the switch 70
`60 ing direction.
`LZ. The opposite sides of the secondary coil 111 are
`will cause a plate member 130 to rotate about an axis
`115, 116 respectively.
`connected to terminals
`The relay 91 is energizable
`of a
`by the depression
`into engagement with a contact 131 to ground the
`wire
`121. After the lug 72 has passed the switch 70 the plate
`switch 118 which is spring
`remote control push-button
`biased so that the switch will return to its open position
`member 130 is returned to its position by a spring 132.
`,,,3 The plate 130 is bent to provide angularly related
`upon release by the operator. The depres­
`immediately
`por­
`sion of the switch 118 closes its normally open contacts
`tions 133, 134 with the included angle defined by the
`the relay 91
`120 to complete a circuit for energizing
`in the illustrated embod