US1300782A - Door operating and locking device. - Google Patents

Door operating and locking device. Download PDF

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US1300782A
US1300782A US2743715A US2743715A US1300782A US 1300782 A US1300782 A US 1300782A US 2743715 A US2743715 A US 2743715A US 2743715 A US2743715 A US 2743715A US 1300782 A US1300782 A US 1300782A
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door
mechanism
means
switch
operating
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US2743715A
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Walter S Ryan
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Robert C Lafferty
Walter S Ryan
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F17/00Special devices for shifting a plurality of wings operated simultaneously
    • E05F17/001Special devices for shifting a plurality of wings operated simultaneously of prison cell doors
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05Y2201/00Constructional elements; Accessories therefore
    • E05Y2201/20Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore
    • E05Y2201/218Holders
    • E05Y2201/22Locks

Description

'w. 8. RYAN.

, Patented Apr. 15,1919.

N U m Jifliliiriwml.

O. EEEEEEEE E o DOOR OPERATING AND LOCKING DEVICE.

APPLICATION FILED MAYH. 19m.

m: mmms urns m, momumm wAsHlNcmN, n. c.

iinrrnn sra'rns rarnn'r ornron.

WALTER s. RYAN, on NEW YoEK, N. Y., AssIeNoE. or ONE-HALF ronoBEE'r c. y

. EAEEE TY, on NEW YORK, n. Y.

DOOR OPERATING AND LOCKING DEVICE.

Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filedMay 11. 1915. Serial $10,2 7,437.

To all whom it may concern:

Be it known that I, WALTER S. RYAN, a citizen of the United States of America, and a resident of the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Door Operating and Looking Devices, of which the followingis a specificaating mechanism whereby a plurality of doors may be selectively operated by power transmitted from a common source.

Another object is to provide mechanism, having a controlling means, for moving a door in two directions, which mechanism, when it has moved the door to its limiting position in one direction under one adjustment of said controlling means, is automatically set to move the door in the opposite direction upon a change of adjustment of said controlling means, and, further, to provide additional means for setting said mechanism to move the door in the opposite direction, said last-named means being operable at will and preferably being rendered inoperative when the door reaches a limiting position and rendered operative when the door moves therefrom.

Other and further objects and advantages will appear from the'following description, taken in connection with the accompanying drawings forming part of this specification and be pointed out in the hereunto-appended claims.- j

I have shown and described a construction of a character similar to that shown and described herein in m'ycopending application, Serial Number 27,436, filed May 11, 1915, for door operating andlocking devices.

Referring to the drawings accompanying the description of this invention, in" which like reference characters indicate similar P 2 Figure 1 is adiagrammatic' view of a preferred form of a door-operating and locking mechanism embodying my inventionj Fig. 2 is a cross-section on the line 2- 2 of Fig. 1;

Fig. 3 is a diagram of the Wiring of the electrical mechanism of Fig. 1; and Fig. 4 isa partial cross-section on the line 44 of Fig. 1.

In the embodiment of my invention herein disclosed, a main power source, comprising a rotating shaft, is provided. The doorznoving mechanism comprises a shaft and means for; rotating said shaft in either direction from the main power shaft. The shaft included in the door-moving mechanism carries a worm which cooperates with a nut. The nutis attached to the door in a way which will permit movement of the nut relatively to the door after the door reaches its limiting position. A locking means is provided for the door which is operated by the movement of the nut after the door reaches its limiting position. The mechanism which transmits rotation to the door moving shaft from the main driving shaft is con trolled by electrical mechanism. Theelectrical mechanism is controlled by circuits which include an automatically operated preparing switch which is operated by movement of the nut after the door reaches its limiting position, and the circuits are also controlled by a manually operated switch One of the circuits includes a switch operated by the door to render that circuit operable after the door leaves one of its limiting positions. The same circuit includes an electromagnet for operating the preparing switch. The manually operated controlling switch is also included in this circuit, and the circuit is so arranged that after the door leaves one of its limiting positions the preparing switch may be operated at will without waiting for the door to reach its limiting position.

In the embodiment of my invention herein disclosed, a main power shaft 1, which preferably comprises a number of sections connected by universal joints 2, is mounted for rotation in pedestals 3 and 4 and carries a driving pinion 5. Mounted in the same pedestals for rotation and for limited axial movement is the door-moving worm shaft 6. Near the ends of this shaft, which are mounted in the pedestals 3 and 4, are fixed collars 7 and 8, respectively, and springs 9 and 10 are placed around the shaft and positioned axial movement. Coiiperating with the worm 6 is a nut 11, on which is mounted an extension in the form of an eye 12'. The door 13 is provided with hang'ers14', on which are rollers 15, which ride on a track 16. Between the hangers 14 extends a bar 17, which fits loosely within the eye 12. Springs 18 and 18 fit around the bar 17 and are positioned upon opposite sides of the eye and between the eye and adjacent hangers 14.

It'will be seen that the rotation of the shaft 6 will cause a backward or forward motion of the door, and that the shaft may continue to rotate and move the nut against the pressure of the springs 18 and 18 after the door reaches a limiting position.

In order to rotate the shaft 6, a controlling mechanism is provided which includes mechanism for transmitting rotation of the main shaft to the door-moving shaft and means for controlling the transmitting mechanism; A yoke 19 is journaled on the shaft 6. On the shaft 6 there is keyed a pinion 20, and pivoted on the yoke and meshing with the pinion 20 are the pinions 21 and 22. The pinion 21 is of such a size that when the yoke is rocked about shaft 6 from its vertical position the pinion 21 will mesh with the pinion 5 keyed to the shaft 1 to impart rotation in one direction to the shaft 6; Pivoted to. the yoke 19 and meshing with the pinion 22 is a pinion 23, which is so positioned thatwhen the yoke is rocked about the shaft 6 in the opposite side of its normal vertical position the pinion 23 will mesh with the pinion 5 on the shaft- 1 and, through the pinions 22 and 20, impart rotation to the shaft 6 in the opposite direction. A lever arm 24 forms the upward extension of the yoke 19, and springs 25, attached to opposite sides of the arm 24, hold the yoke in normal vertical position, so that neither pinion 21 nor 23 meshes with pinion. 5.

In order to rock the yoke about the shaft 6, an electromagnet 26is placed on one side of the arm 24, and an electromagnet 27 is placed on the other side of the arm 24-, so that, when theelectromagnet 26 is energized, power will be transmitted from the shaft 1 to the shaft 6 through the pinions 5, 21 and 20, and, when the electromagnet 27 is energized, power will be transmitted from' the shaft 1 to the shaft 6 through the pinions 5,

22 and 20.

In order tocontrol the energizat'ion of the magnets 26 and 27, the following circuits and switches are provided. The current is led from the source by the wire 28 to the cut out switch 29, which will hereinafter be described, and by the wire'29. to the switch arm 30' of the preparing switch, generallyindicated by 31. From onecontact 32'of the preparlng switch current is led to the electromagnet 27 bythe wire 32, andfrom the electromagnet 27 the wire 33 leads to one point 34 of the three-point operating switch or controller 35. From the center point 36 of the switch 3'5'the wire 37 leads back to the source From thecontact 38 of the preparing switch 31 the wire 39 leads to the magnet '26 and the wire 40 leads from that magnet to the third point 41 of the controller A small: lamp 42 is connected across the points 36 and 41, and a small lamp 43 is connected across the points 34 and 36 of the controller 35. r y 7 If the'preparing switch 31 is'in the position shown in the drawings, and the arm 44 of the controller 35 is swung overabout the point 36 to contact with the point 34, the

the collar 46 loosely mounted onthe rod 47 which slides in pedestals 4 and 51 and compresses the spring 48, which is mounted on the rod 47 and kept from sliding thereon by the collar 49adjustably held on the'shaft by the screw 49. After the spring 48'is sufficiently compressed, the spring 50, mounted on the top of the pedestal 51- and having an offset 52, is bent up so that the offset 52 slips out of the notch'53 in the block 54 mounted on the rod 47, by the action of the sloping sides of the notch 53 against the offset 52."

The rod 47 moves tothe rightas the spring 48 is compressed and the offset 52 drops into the notch 55 in the-block 54. As the rod 47' moves to the right, it carries with it the link 56 attached to it, and the link 56 being attached to the arm 30, the arm30 is swung over so that it cofiperates with the contact 38 of the preparing switch 31. Thisestablishes a circuit from the supply wire 37 through the lamp 42, wire 40, magnet 26 wire 39, contact 38, arm 30, wire 29 and wire 28, back to the source. The lamp is a high resistance lamp, and too little current flows to energize the magnet26 enough to swing the arm 24, but the lamp 42 is illuminated and indicates that the doorhas reached its closed position. 7

then the arm 44-is swung over on to the point 41, lamp 42 is short-circuitedand goes.

out, but the magnet 26 is energized, and power is transmitted from the shaft 1.. to shaft 6 through the pinions5, 21 and 20, and the shaft 6 is rotated to open the doorgand, when the door reaches its limiting open position, the actuating member 45 strikes against the collar 57, slidable on rod 47, and conn presses the spring 58 which surrounds the rod 47 and is kept from sliding thereon by the collar 59 held in position on the shaft'47 by the screw 60. After the spring 58 is sufii- 5 ciently compressed, the offset 52 of the spring 50 is forced out of the notch 55 in the block 54, and the rod 47 moves to the left, and the preparing switch 31 is moved to its initial position, and the circuit is established through the lamp 43, showing that the door has reached its open position.

It will be seen in each case that the switch 31 is automatically movedby the door and prepares a circuit for energizing one of the magnets 26 or 27 by closing the circuits of those magnets at one point, while the con troller or operating switch 35 closes the circuits of the magnets 26 and 27 at another point to energize them. i Pivoted on the pedestal 51 at 61 is a lockoperating bar 62, which has an oifset end part, the parts being joined by the oblique portion 64. Pivoted to the end of the bar 62 at 63 is a lock-operating rod 65, which carries a lock 66, which drops downinto the opening 67 formed in the door 13. Fixed in the operating member '45, with their centers on a line perpendicular to the oblique portion 64 are pins 68, cooperating with the top and with the bottom, respectively, of the lock-operatingbar 62. As the actuating member moves along until the oblique portion 64 rests between these pins 68, the lockoperating rod is allowed to drop to lockthe door" The upper end of one ofthe door hangers 14 is formed into a cam 69, which cooperates with. a roller 70 on the lock-operating rod 62 to prevent the loclco-perating rod from dropping before it is positioned within the opening 67 in the door. Mounted on the actuating member 45 are rollers 71, which cooperate with the rod 47. The u-pper: one of these rollers moves underneath a block 72 attached to the'frame of. the door, so that a force applied to the lock-operating rod 66 and tending to lift it cannot possibly raise the lock-operating bar 62.

. If the movement of the door is obstructed, the shaft 6 will continue to rotate until an unusual axial thrust is imposed upon it and one of the springs 9 or 10, which are designed to resistthe normal axial thrust, is compressed and the shaft 6 moves axially. Collars 73 are fixed on the shaft 6 and accommodate between them one end of the lever 74, which is pivoted at 75. The other end of the lever has attached to it the link 76, which is attached to and oscillates the cut-out switch 29 about the point 78 at which 6.0 it is pivoted. The cut-out switch 29 comprises an inverted U-shaped sealed glass tube, which contains enough mercury to fill thelegs of the tube and provide a contact between them. when the tube forming the ca bottom. of the Ultis horizontal. When the switch 29 is oscillated about the pivot 7 8, the contact is broken, and the current passing into the bottom of one leg by the wire 28 and out of the bottom of the other leg by the wire 29 ceases to flow. Across the terminals of the switch 29 there is connected an alarm bell 77, so that, when the motion of the door is arrested, the current is diverted through the alarm bell 77, and notice is given that the door is not moving.

In order that the door may be opened after it has been part way closed without moving the door to its completely closed position in order to operate the preparing switch 31, a separate means is provided for operating that switch at will after the'door has left its limiting position. It will be seen that when the door is open and the switch 31 is in the position shown in Fig. 3, the magnet 26 cannot be energized until the door is entirely closed and the arm 30 of the switch 31 shifted over to the contact 38. In order to shift this arm 30 without entirely closing the door, an electromagnet 79 is provided to move the rod 47 just as the actuating member 45 would move it if the contact member were pushed up against the collar 46. The circuit of this magnet 79 comprises the wires 80 and 81 and closes the gap between the arm 30 and the contact 38 when the arm 30 is in a position to operate mechanism to close the door. The wire 81 includes a spring-closed switch 82, which is held open by the contact of the hanger 14 of the door with the rod 83 attached to the contact piece 84 of the switch, which contact piece is normally held against the terminals 85 of the wire 81 by the spring 86.

' It will be seen that, if the arm 44 is swung over on to the contact 34, the magnet 27 will be energized and the door will start to close. If, however, it is desired to open the door again, the arm 44 may be swung over on to the contact 41 and the magnet 79 is energized, which causes a shifting of the rod 47 and the preparing switch arm 30, and the circuit of the magnet 26 is completed and the door will be opened.

In order that the rod 47 will not be shifted tothe right by the magnet 79 immediately after the actuating member 45 has caused a shifting of the rod 47 to the left when the arm 44 has been swung to the contact 41 to open the door, the circuit of the magnet 79 is caused to break, as above described, by the switch 82, which is operated by the door when it reaches open position.

The wire 80, which leads to the magnet 79, is connected to the wire 28, and the wire 81, which leads from the magnet 79, is connected to the wire 39. It will be seen, therefore, that, if the movement of the door is obstructed and the cut-out switch 29 is rotated, so that the circuit through the mercury in the cutout switch is broken, the circuit of the magnet 79 will not be broken, but will be energized as soon as the arm 44 is swung over on to the point 41, if the door is actually in transit and switch 82 is closed.

Although one magnet 79 and its controlling circuit has been illustrated and described, it will be apparent to those skilled in the art that a similar magnet might be applied to the opposite end of the rod 47 from that at which magnet 79 is applied and be connected from the wire 28 tothe wire 32. With such a magnet, the operating mechanism could be reversed if the opening movement of the door was obstructed.

It will also appear to those skilled in the art that the magnet 7 9 might be dispensed with entirely, for the circuit formed by the wires 80 and 81, which circuit is closed by the switch 82, could be depended upon to energize the magnet 26 to cause a reversal of the movement of the door, if it had low enough resistance.

While a positive locking member has been illustrated and described, such a locking means is not absolutely necessary, because the door is driven by a worm-and-nutgearing and the door could not be moved unless the shaft were rotated by some outside force, so that the driving mechanism is itself a locking mechanism.

It will be seen that means for operating the preparing switch has been provided which is dependent upon the position of the door, for this means is not operative when the door is at its limiting open position, and it is only operative when the door has moved from its limiting position.

While I have disclosed my invention by describing with great detail all of the features of a particular embodiment of my invention, I do not intend that my invention shall be limited to the embodiment herein disclosed, but I intend that the embodiment disclosed shall be merely interpretive of my invention, and that my invention shall only be-definedby the claims hereunto appended.

hat I claim and desire to secure by Letters Patent of the United States is the fol lowing 1. In a door-operating mechanism, the combination of driving mechanism for the door, a source of power for said mechanism, means for cutting off said source, a controller and means dependent upon the position of said door and upon said controller for operating said first-named means to cut oli said source of power.

2. In a door-operating mechanism, the combination of mechanism having a plural ity of operative settings for moving the door respectively in a plurality of directions and means dependent upon the position of the door for shifting said mechanism from one setting to another.

8. In a door-operating mechanism, the

combination of mechanism-having a plum} ity of operative settings for moving the door respectively in a plurality of directions, a controller and means dependent upon the position of the door'and of the controller for shifting said mechanism from one set ting to another.

i. In a door-operating mechanism, the combination of mechanism having a plurality of operative settings for moving the door respectively in a plurality of directions and means rendered operative upon movement of said mechanism from a limiting position for shifting said mechanism from one setting to another.

5. In a door-operating mechanism, the combination of mechanism having a plurality of operative settings for moving the door respectively in a plurality of directions, a controller and means rendered operative upon movement of said mechanism from a limiting position and dependent upon said controller for shifting said mechanism from one setting to another.

6. In a dooroperating mechanism, the combination of door-moving mechanism having parts adjustable to a plurality of settings to cause said mechanism to impart motion to the door in a plurality of directions and means dependent upon the-position of said door for effecting the adjustment of said parts of said mechanism.

7. In a door-operating mechanism, the combination of a door-moving mechanism having parts adjustable to a plurality of positions whereby said mechanism may impart motion to the door in a plurality of directions, a controller for said mechanismand means dependent upon the position of said-door and upon the position of said controller for efi'ecting the adjustment of said parts in said mechanism. 7

8. In a door-operating mechanism, the combination of driving mechanism for the door, a source of power for said mechanism and means rendered operative upon movement of said mechanism from i a limiting position for cutting of]? said source of power.

9. In a door-operating mechanism, the combination of a door-moving mechanism having parts adjustable to a plurality of positions to cause said mechanism to impart motion to said door in a plurality of directions and means rendered operative upon movement of said mechanism from a limiting position for effecting the adjustment of the parts of said mechanism.

10. In a, door-operating mechanism, the combination of a door-moving mechanism having parts adjustable to a plurality of positions to cause said mechanism to impart motion to said door'in a plurality of directions, a controller for said mechanism and means rendered operative uponmovement of said mechanism from a limiting position-"and.

dependent upon said controller for efiecting adjustment of the. parts of said mechanism.

11. In a door-operating mechanism, the combination with a door of a door-moving mechanism, a source of power therefor means for cutting off said source of power and means rendered operative upon movement of said door from a limiting position for actuating' said last-named means.

12. In a door-operating mechanism, the combination with a door of reversible driving mechanism for the door, a source of power therefor, means operated by the movement of said mechanism for cutting off said source of power at limiting positions, means dependent upon the position of the door for reversing said mechanism, and means for connecting up said sourceof powen;

13. In combination with a door-operating mechanism,- a controlling mechanism for said first-named. mechanism, an" operating circuit for said controlling mechanism, a plurality of switches in said circuit, one of said switches being operable by the door, another of said switches being manually operable and auxiliary means dependent on the position of the door for operating said first-named switch.

14:. In combination with a door-operating mechanism, a controlling mechanism for said first-named mechanisiman operating circuit for said controlling mechanism, a plurality of switches in said circuit, one of said switches being operable by the door, another of said switches being manually operable and a circuit controlled by the door and by said manually-operable switch for operating said first-named switch. a c

15. In a door-operating mechanism, the

combination of a reversible door-moving mechanism, a controller and means rendered inoperative by said mechanism upon reaching its limiting position and dependent upon said controller for reversing said mechanism.

' 16. In a door operator, means for applying moving force to the door, means for discontinuing the application of the moving force upon opposition to the movement of the door and operated by said opposing force, and means for applying moving force to the door while its motion is opposed to move it in the opposite direction.

17. In a door operator, mechanism for moving the door, means for rendering said mechanism inoperative when the movement of the door is opposed and operated by said opposing force, and means for setting said mechanism to move the door while its motion is opposed in the opposite direction.

18. In a door operator, mechanism for moving the door in a plurality of directions, means for rendering said mechanism inoperative when the movement of the door in one direction is opposed and operated by said opposing force and means for rendering said mechanism operative to move said door in another direction. n

1-9. In a door operator, mechanism for moving the door, a source ofpower for operating said mechanism, means for causing said source of powerto operate said mechanism in opposite'directions, meansifor rendering inoperative said last-named means when movement of the doorin one direction is opposed and operated by said opposing force, and means for operating saidTmechanism to move the door in another direction. 20. Ina door operator, mechanism for moving the door, a source of power for opcrating said mechanism, means for connecting said source of power to said mechanism to operate it in different directions, means for cutting off said source of power upon opposition to theimovement ofxthe door in one direction and operated by said opposing force, and means forconnecting said source of power to said mechanism to operate it in the opposite direction.

21. In a door operator, mechanism for movingthe door, a source of power for operating said mechanism, means for causing said source of power to operate said mechanism in opposite. directions, a controller for said means, means for rendering inoperative said last-named means when the movement of the door in one direction is obstructed and operated bysaid obstruction, and means dependent upon said controller for operating said mechanism to move the door in another direction. i

22. In 1 a door-operating mechanism, a source of power, door-moving mechanism,

means for transmitting power from said source to said mechanism in opposite directions according to the adjustment of said means, means dependent upon the position of said mechanism for changing the adjustment of said means and separate means for controlling the flow of power to said mechanism. i

23. In a door operator, means for applying moving force to the door, means for dis- 'continulng the applicatlon of the moving force upon obstruction of the movement of the door, a controller for said first-named means, and means dependent upon said controller for causing said first-named means to apply moving force to said door in a reverse direction.

24:. In a door operator, means for applying moving force to the door, means for discontinuing the application of the moving force upon obstruction of the movement of the door, a controller for said first-named means, and means dependent upon said controller and rendered operable upon movement of said door from limiting position for causing said first-named means to apply moving force to said door in a reverse direction.

25. In a door operator, mechanism for moving the door, a source of power for operatmg sald mechanism, means for causing said source of power to operate said mechanism in opposite directions, means for rendering inoperative said last-named means when movement of the door in one direction is opposed, and means for operating said mechanism to move the door in another direction, said last-named means being rendered operableupon movement of said-door from limiting position.

26. In a door-operating mechanism, a source of power, door-moving mechanism, reversing gearing having separate positions for diiferent directions of operation for transmitting power to said mechanism, solenoids for setting said gearing to different positions, circuits for energizing said solenoids, a switch operated by said mechanism for preparing the circuit of one solenoid and breaking the circuit of the other, and means operable while the door is in transit for preparing one circuit and breaking the other.

27. In combination With a door-operating mechanism, a controlling mechanism .for said first-named mechanism, an operating circuit for said controlling mechanism, a plurality of switches in said circuit, one of said switches being operable by the door, another of said switches being manually operable, and means for operating said first-named switch and rendered operable by movement of said door from limiting position.

28. In a door operator, mechanism for moving the door, a source of power, reversible mechanism for transmitting power from said source to said mechanism, means for reversing said mechanism and including a circuit, a manually operable switch in said circuit and a door-controlled switch in said circuit.

29. In a door-operating mechanism, a source of power, a door-moving mechanism comprising a shaft, a gear thereon, a yoke journaled thereon, reversing gearing onsaid yoke for transmitting power to said gear in opposite directions according to the position of said yoke upon said shaft and'means dependent upon the position of said mecha nism for moving said yoke upon said shaft.

30. In a door-operating mechanism, a source of power, door-moving mechanism, reversing gearing having separate position for diiferent directions of operation for transmitting-power to said mechanism, solenoids for setting said gearing to diiferent positions, circuits for energizing said solenoids, a switch operated by said mechanism for preparing the circuit of one solenoid and breaking the circuit of the other and a manually-operated switch for making one circuit and breaking the other.

31. In a door-operating mechanism, a source of power, door-moving mechanism, reversing gearing having separate positions for different directions of operation for transmitting power to said mechanism, solenoids for setting said gearing to different positions, circuits for energizing said solenoids, a switch operated by said mechanism for preparing the circuit of one solenoid and breaking the circuit of the other, means operable while the door is in transit for preoarin one circuit and breakin the other and a switch for controlling said last-named means and for making one circuit and breaking the other.

32. In a door operator, mechanism for moving the door in a plurality of directions. means for rendering said mechanism inoperative when the movement of the door inone direction is opposed and operated by said opposing force, and means for rendering said mechanism operative to move the door in another direction while said mechanism is still inoperative to move the door in the one direction.

In testimony whereof I have signed my name to this specification.

WALTER S. RYAN.

Copies of this patent may be obtained tor five cents each, by addressing the Commissioner of Patents. Washington, D. G.

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299385A (en) * 1992-10-09 1994-04-05 Glitsch, Inc. Detention cell locking system
US5341598A (en) * 1992-05-08 1994-08-30 Mark Iv Transportation Products Corporation Power door drive and door support having motor operated locks
US6134838A (en) * 1997-02-24 2000-10-24 Westinghouse Air Brake Company Power door having a drive member disposed within a hanger portion and rollers of a door support engaging the hanger portion for motion therealong
US6446389B1 (en) * 2000-04-14 2002-09-10 Westinghouse Air Brake Technologies Corporation Tandem sliding door operator
US20020152684A1 (en) * 2000-03-16 2002-10-24 Martin Fink Control of the movement of a sliding or swinging and sliding door in its end closing area

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341598A (en) * 1992-05-08 1994-08-30 Mark Iv Transportation Products Corporation Power door drive and door support having motor operated locks
US5299385A (en) * 1992-10-09 1994-04-05 Glitsch, Inc. Detention cell locking system
US6134838A (en) * 1997-02-24 2000-10-24 Westinghouse Air Brake Company Power door having a drive member disposed within a hanger portion and rollers of a door support engaging the hanger portion for motion therealong
US6739092B2 (en) * 1999-04-15 2004-05-25 Westinghouse Air Brake Technologies Corporation Transit vehicle door operator and lock
US20020152684A1 (en) * 2000-03-16 2002-10-24 Martin Fink Control of the movement of a sliding or swinging and sliding door in its end closing area
US20050246054A1 (en) * 2000-03-16 2005-11-03 Martin Fink Method and control apparatus for controlling movement of sliding door in its end closing area
US6446389B1 (en) * 2000-04-14 2002-09-10 Westinghouse Air Brake Technologies Corporation Tandem sliding door operator

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