US2256613A - Door operating mechanism - Google Patents

Description

f sept, 23, 1941.

P. R. FORMAN ETAL DooR OPERATING MECHANISM Fiied April 29, 1959 3 Sheets-Sheet 1 INVENTORS Pars i?. Forman Pascoe D. Conklin Sept. 23, 1'941. P. R. FORMAN ETAL DOOR` OPERATING MECHANISM Filed April 29, 1939 3 Sheets-Sheet 2 @www g INVENTORS Fm dit Con/clin Pars l?. F'o Ro'scae D JS ATTORN s Sept. 23,l 1941.

P. R. FORMAN ET AL DOOR OPERATING MECHANISM Filed April 29, 1939 '3 Sheets-Sheet 5 INVENTORS nbr waan BY acne 7.0011 [in y QJZ; 0L ATTO S Patented Sept 23, 1941 Unirse STATES PAT ENT OFFICE Paris R. Forman and Roscoe D. Conklin, Rahway,

N. J., assignors to National Pneumatic Company, New York, N. Y., Virginia 'a corporation of West Application April 29, 1939, Serial Nol 270,727

3 Claims. j(Cl. 268-65) This invention relates to improvements in power operated door mechanisms.

vAn object of this invention is to provide, in combination with a door or similar closure member, and a door check device arranged to close the door, a motive device for supplying the power to open the door and means interconnecting it with the door whereby the motive device opens the door and the door check .device is free to .and does close the door.

Another object of this invention is to provide, in a combination of the above type, a member driven by the motive device for causing the door to open and immediately returnable from Open position after the door reaches fully open position, either by the motive device or independently thereof.

Another object successfully secured by the above mechanism is that of being able to manually open the door independently of the power operating mechanism whereby the failure thereof does not prevent the normal use of the door.

An additional object of the invention successfully secured by the above mechanism is that of permitting the door to be held open after Vbeing opened by the mechanism without disturbing it structurally or functionally and without any special action On the part of the user.

Additional objects of this invention which are successfully secured thereby will be apparent to those skilled in the art in view of the following detailed description of two forms of the invention submitted for the purpose of illustrating the true scope thereof.

This invention resides substantially in the combination, construction, arrangement and relative location of parts as hereinafter disclosed.

In the accompanying drawings,

Figure 1 is a front elevational view of the upper portion of a closure member and the mechanism associated therewith which, in combination, comprises one form of this invention.

Figure 2 is a detailed cross-sectional view taken on the line 2-2 of Figure l.

Figure 3 is a left hand end elevational view of a detail.

Figure 4 is a diagrammatic illustration of a suitable circuit for this mechanism.

Figure 5 is a view similar to that of Figure 1 with the closure member omitted, showing a modified form of this invention.

Figure 6 is a diagrammatic illustration of a suitable circuit for the modified form of the invention.

CIU

Vdoor in any suitable manner.

In the structure oi Figures 1 to'4 inclusive, a member which may be termed. herein a'nut, when moved by the power source in one direction,

causes through suitable connecting means the closure member to open andas soon as it is fully open the nut is returned toits initial position independently of the motive device. This leaves the door free to be closed by means of a door 'check device which may take anyone of a number of known forms. Y

As illustrated in Figure 1, the wall or framework containingv the door opening is indicated by the reference numeral I. The door which closes this opening is shown at 2 mounted at the side of `the opening by a plurality of hinges 2',

only one of which is shown so that the door is of the swinging type.

LMounted on the door near the ltop,.at any suitable location, isa door check device 3 which is illustrated in one well known form. The check device is secured to the door as illustrated by meansof a bracket 4 which is integral with the :housing of the check device and secured tothe This-check device, as is well known, comprises a casing having a vertical Vshaft `rotatably vmounted therein which is provided, as shown, with` an arm or lever 5 extending horizontally. The lever 5 is Ypivotally connected at l6 to a-lever 1 which inlturn is Ypivotally connected at 8 to an attaching plate 9 secured in any suitable manner to the wall in which the door opening lies.

Door check devices Yof this type are `usually provided with aspring, as is well known, which stores potential energy when `the door is open which is expended in closing the door when free. In addition vthese devices are normally provided with some form of cushioning mechanism such as dashpots to ensure a smoother'action.

At lIII is asupporting plate of `any suitable form which is secured to the wall over the door 'opening and is adapted to receive, as is clear from Figure 2, a removable cover I I by means of which the mechanism is enclosed. In thelbottom wall of the cover there is provided a longitudinal slot 'I2 as is clear from Figure 2, for a Apurpose to be explained later.

Mounted on the base II! is a motive device which in the form of the invention illustratedis an electric motor. It will be apparent as the description proceeds that other suitable forms of motive devices can be used, as for example Aa pressure fluid operated engine with the necessary mechanism to convert its rectilinear movement and 20 mounted on the plate I9. 'The threaded rod I 8 is rotatably mounted in these brackets.

This rod has mounted on the end thereof adjacent the housing I1 a sleeve 22 which is connected to the inner end of a spiral spring 2| by means of a rivet or screw 23.` The outer end of the spring 2| is connected'to the wall of the member I1 by means of a rivet or screw 24. As is clear from Figure 2, this spirally Wound spring is enclosed within the annular housing |1. Ex-

tending between the standards I9 and 20 isa pair of parallel rods or guide bars 'and 26 which lie parallel tothe screw rodV I8.y A carriage 21 provided with` suitably shaped sleeves 28 and 29 slides on the. rods 25 and 26. VVThe carriage isprovided With Aa central passagetherethrough, as is clear'from Figures 1 and 2, of a diameter. so'that the threaded rod I8 may pass freely through it. A member 3.6 lis slidably mounted on the rods 25and 26 and has a central threaded passagewhich engages thevthreads on the rod I8 and may therefore be termed a nut.

v Secured to the housing of the door check 3 is a bracket 33 .to .which at one end is pivotally connected a link 32 which is also vpivotally connected at its lother end to a depending projection on the carriage 21. Mounted on the base I0 is a limit switch 35 provided with an-operating arm 34 positioned to be engaged by a lug 33 mounted on the carriage as Willbe explained later. lIn `Figure 1 there is. diagrammatically illustrated at R a relayvwhich` will be referred to in connection f 'with Figure 4.

In Figure 4 the terminals 36and 31.01" the circuit are adapted to be connected to any suitable current source. The lead 39 from the terminal 36, has connected therein theplimit switch 35.

Lead 39 is connected to a wire 46 which termi-` nates at one end in a' pair of spaced contacts 4| and at the other end in a fixed contact 42 form ing -part of the relayR. Another part of contacts 43 positioned adjacent the contacts 4| is connected by thewire 44 tooneterminal ofthe operating winding 45 of thejrelay R. ,u The other terminal of the winding is connected by Wire 46 to one terminal of the motor I3. 'Ihe other Yterminal of the motor is connected by wire 49 to Wire 44 and by wire 56 to the fiXed 'terminal 5I of the relay. Wire 46 is'connected by wire 41 to the terminal k31. The relay is provided with a movable* contact 52 which isvorut. of engagement with the fixed contacts 5| and 42 when the Winding 45 is deenergized and'in engagement therewith when energized. The pairs of contacts 4I and 43 are part of push button'switches which have been designated by the reference characters O and C. These push button switches are mounted on the wall I adjacent the'dooron Y opposite sides thereof and serve to initiate the opening operation when operated respectively by a person desiring to move through the door opening. Y

The operation of the device will now be de# scribed inadetail, it being assumed that the door is closed, terminals 36 and 31 are-connected. to a suitable current source and switches O andC are open. Atthistime the limit switch 35is closed and relay R is deenergized. In order to open the door from either side either switch O or C is manually operated thereby connecting the respective contacts of the pairs 4| and 43 together.

Current then flows from the source to terminal 36 through closed limit switch 35, wire 39, wire 40, the connected pair of contacts 4I and 43, Wire 44, winding 45, wire 46, and back to the current source through wires 41 and terminal 31. energizes the winding 45 and operates the relay so that movable Contact 52 interconnects the contacts 5I and 42. Current then flows from the wire 48 through contact 42, movable contact 52, contact 5|, wire 59, wire 49, winding 45, wire 46, and Wire 41 providing a holding circuit for the winding 45 maintaining it energized.

Current also flows from wire 59 through the motor I3 and back to the current source through wires 46 and 41. Thus the motor is energized causing it .to revolve with the result that the shaft I8 revolves and at the Sametime the spring 2| winds up. The-threads on the? shaftf|8 and the nut 39 are inthe proper direction'to'caus'the vnut 30 to move from its initial position shown Vcauses carriage 21'to slide to the right- Through the connecting mechanism the door is caused to swing open. Atlthis time it mayfbe noted that the slot I2 in the cover I'I is provided so that the depending projection on the carriage may.. move therein. As lthe door reaches fully open position, the lug 33 on the carriage21 engages the operatingV arm 34 of the limit switch .35 tocpen it. rIt may be noted that the spiral spring 2| is not tightly coiled so 'that any tendency of the motor to overrun at this time can be absorbed by the spring.

As soon as limit switch v35 .opens winding 45 of the relay is deenergized so that the holding vcircuit Yfor the Winding and the current supply circuit for the motor are broken by the disengagement of contact 52 and contacts 5IV and 42. At this point it may be noted, asis obvious,"that switches O and C need only be closed momentarily in View o-f the fact that a holding circuit is set up for therelay. When the motor circuit is broken it is quickly brought to a stopbyV the further coiling Vof the spring 2|. Immediately thereupon the coiled spring 2| causes the shaft I8 to revolve in the reverse direction returning the nut 30 to its initial position. The springs 36 and 31 on the rods 25and 26 serve as bumpers ,to aid in bringing the nut to a stop. When the nut is back at its normal position the coiled spring 2| is relaxed to its normal position as shownjin Figure 3. Also it is capable of additional uncoiling movement if necessary., YIn other words, in all normal operation ofthisV apparatus the spring 2| is never coiled or uncoiled tothe maximum.

to be returned .to closed position by means of the door check device which as isY Well known is a motive device which stores energy on the opening `of the door suiiicient .to- Vclose the door when it is released. As the door is returnedto closed position the carriage 21 is caused toslide back to its initial position. With this arrangement it will be seen that the door is not positively connected to the drive mechanism so that it'canbe freely opened by hand and whenfully opened'can be held open as longas may be desired. f

`In Figures 5eand/ 6 many of the parts are the same as before and where this occurs the same reference numerals are employed, It maybe This The return of the nut 38 leaves the doorfree noted that the link. 32 is connected to the door check as before, which is mounted on the door and secured to the door frame as previously described. The main difference between the structure here disclosed andv that previously described is that the casing l1 and the spring mechanism therein is omitted and in place thereof there is provided a pulley l1 rigidly secured kto the shaft i8. This pulley is connected by the belt l5 to the pulley I5 as before. The carriage vand nut structure are the same. However, another limit switch Eil is provided, with an operating arm 6l arranged to be engaged by the lug 33 when the door is' in closed position to open switch 60.

In this case the relay R is provided'with'many more movable contacts than in the previous case and the motor I3 is a 'reversing motor. The current supply terminal 36 is connected by wire 33 to one terminal of the winding 45 of the relay and to two contacts of a fixed pair controlled by the relay. One contact of another pair is connected b-y wire 15 to one of the iXed contacts of the push button switch 1I. The other terminal of the push button switch is connected by wire 12 to the current supply terminal 31 and through the limit switches 35 and 60 to the corresponding contacts of three pairs controlled b-y the relay.

The other terminal of the winding 45 is connected to the wire 1B. Wire 38 is connected by wire S2 to one of the windings of the motor I3', the other terminal of that winding being connected to one of the contacts of each of four pairs controlled by the relay. One of the contacts of each of two pairs of the relay is connected by wire 89 to one terminal of another winding of the motor I3 and the remaining terminal thereof is connected to one of the fixed contacts of each of another pair controlled by the relay. The relay is provided with seven movable contacts designated by the reference numerals 13, 14,15, 16, 11, 18 and 18. The movable contacts 13, 14, 15 and 16 cooperate with four pairs of the iixed contacts and are out of en` gagernent therewith when the winding 45 is deenergized, as shown. At this time the movable contacts 11, 13 and 19 interconnect three pairs of the iixed contacts of the relay. Only one push button switch 1I is shown but it is apparent that as many more as desired may be connected in parallel therewith so that the door may be opened from either side or from any desired point.

In the operation of this arrangement, when switch 1l is closed current ows from terminal 3S through wire 3B, winding 45, wire 10, closed switch 1l, and back to the current terminal 31 through wire 12, energizing winding 45. The movable contacts of the relay then shift from the position shown to the other position so that the circuits through the lower three contacts are broken and the circuits through the upper three contacts are made. Current then flows through wire 3B, winding d5, wire 10, the switch including the movable contact 13, closed limit switch 35, and back through wire 12 to the terminal 31. Thus a holding circuit for the winding 4'5 is completed and therefore switch 1I need only be closed momentarily. Current also flows from wire 38 through the closed switch including the movable contact 15 through wire 8l, the winding of the motor connected thereto, Wire 80, the switch including the movable contact 15, through the wire connected thereto, to the switch including the movable contact 14 and through the closed limit switch 35 to wire 12.

Current also flows from wire 38 through wire 32, thevwinding of the motor connected thereto `end .of the mechanism causing the door to open 4as before. Just as the` door is fully open the arm 33 engages the operating member 34. of switch -35`opening it.

It will beremembered that as soon as the carriage '21 'began to move, arm 34 released the operating member 5'! of the limit switch 60 so that rit closes. ldoes not affect the `circuits since the switch of The closing of this switch, of course,

the relay including the` contact 1| is at this `time open." As soon as limit' switch 35 opens, the

holding circuit for the winding 45 is broken and the relay returns to the position shown in Figure 6.

The connections for the motor I'3' are now reversed with the closing of switchv and the switch containing the contact 19, the lower winding of the motor is energized in the same direction. However, the upper winding of the motor is energized in the reverse direction. In this case current flows from wire 38 through switch including contact 11 to wire 80 and through it to the connected terminal of that winding. It will be remembered that before the wire 38 was connected to the other terminal of the Winding.

Continuing this case, however, current flows from this winding back through wire 8| through the switch containing the movable contact 1B to the wire connected thereto, through the switch containing the contact 19 and limit switch 80 back to wire 12. Thus one winding of the motor i3 is reversed and the motor is energized for operation in the reverse direction. This causes the shaft i8 to revolve in the opposite direction, carrying the nut back with it to its initial position. As the nut gets back to its initial position limit switch 6U opens-it will be remembered that previously limit switch 35 has closed. This leaves the carriage free so that the door can be closed by the door check motor or held open as long as desired. At this time the circuits are returned to normal position, that is, the position shown in Figure 6 and the device is ready for operation to again open the door.

From the above description it will be apparent to those skilled in the art that the features of this invention may be embodied in other physical forms. We do not, therefore, desire to be strictly limited to the description as given for purposes of illustration herein, but rather to the scope of the appended claims.

What we seek to secure by United States Letters Patent is:

1. In a combination as described, a framework forming a door opening, a door movably mounted in the opening, a motive device interconnecting the door with the framework for closing the door, a motor supported on the framework, a screw supported for rotation on its longitudinal axis, means for connecting said motor to said shaft to rotate it, a spring interconnecting said screw with a fixed support, means forming a guideway, a nut mounted on said guideway and engaging said screw, a carriage mounted on said guideway so as to be engaged by said nut, and a connection between said carriage and said door whereby said motor causes movement of the nut along the guideway to cause movement of said carriage in one direction to open the `door and energizes said springso that When said motor is de-energized said spring operates said screw to return the nut to rinitial position so as to free said carriage, so that said motive device is free to close the door.

2. In a door operating combination a door, mo-

tivey means connected to the door and biasing it to closed position, a threaded shaft journaled` adjacent the door, a motor, driving connections between the motor and shaft, a spring connected at one end to the shaft and at the other to an adjacent part, .a driver engaging the threaded shaft and moved by rotation thereof, and means engageable by the driver and .connected to the door whereby the motor when energized causes the door to open and said spring energized to `quickly Areturn the driver to door closed position when the motor is de-energized 'so that said motive device is free to close the door.

3. In av. mechanism as Vdescribed a door, a,

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