US2235380A

US2235380A - Elevator door operator

Info

Publication number: US2235380A
Application number: US190990A
Authority: US
Inventors: Harold V Mccormick
Original assignee: Westinghouse Electric Elevator Co
Current assignee: Westinghouse Electric Elevator Co
Priority date: 1938-02-17
Filing date: 1938-02-17
Publication date: 1941-03-18
Anticipated expiration: 1958-03-18

Description

March 18, 941- H. v. MccoRMlcK 2.235.380

/ n ELEVATOR DOOR OPERATOR Filed Feb. 17, 1958 2 Sheets-Sheet l March 18, 941. H. V, MogjoRMlcK 2,235,380

ELEVATOR DOOR OPERATOR Filed Feb. 17, 1958 2 sheets/ sheet 2 4 /r Z7 37' oe ce / K 2K 3K 4K H l'wel 1| c5@ o l l l i s E e I .ar/eel ce] Tg2 7 ,I' 372 j 1 /z l l l I l I l f ATTO Patented Mar. 1S, 1941 orifice ELEVA'EOR DOOR OPERATOR Harold V. McCormick, Jersey City, N. J., assignor to Westinghouse Electric Elevator Company, Jersey City, N. J., a corporation of New Jersey Application February 17,- 1933, Serial No. 190,990

9 Claims.

My invention relates to elevator door operators and more particularly to the arrangement of the door operative mechanism and the systems of control therefor whereby the hatchway doors and the car doors are operated by individual electric motors.

One object of -the invention is to provide the most effective elevator door systems with simple and inexpensive electric door operators.

Another object is to provide an electrically operated door system by means of which the car may be started away from a fioor as soon as the hatchway door at that floor is almost but not quite closed, with assurance that that door is locked against being reopened and that it will finish its closing travel.

A further object is to provide interlocking mechanism and control which will effect the locking of the hatchway door as soon as it approaches within a predetermined distance of its closed position, but Which will move the door to its final closed. position while maintaining it in its locked condition.

A further object is to provide a system comprising an individual motor and control for each door and gate which may be readily and easily adjusted to suit the characteristics of the door or gate with which it is associated.

It is also an obbject to provide a common checking means for the car door and the adjacent hatch door While they are in midway operation, but to have each door itself operate its own iinal check to insure the final checking oi each door at a predetermined distance from its closed position when it is being closed.

Other objects will be obvious in the following description taken in conjunction with the accompanying drawings in which:

Figure 1 is a top plan view of a portion of an elevator hatchway and a car, with the walls broken away to show the car door or gate and the hatchway door at one of the iioor landings;

Fig. 2 is a front elevation of the upper portion of the car and the car door shown in Fig. 1;

3 is a view in front elevation, from the interior of the hatchway, of the upper portion of the hatchway door shown in Fig. l;

Fig. fi is an enlarged View, in side elevation,v with the cover broken away, of the hatchway door lock and interlock shown in Fig. 1;

Fig. 5 is a straight-line diagrammatic representation of the motors and the control system for operating the doors shown in Fig; 1; and 55 Fig. 5A is an explanatory representation of the connections between the relays and contact members operated thereby in Fig. 5.

List of relays, etc. indaw-ings ORzdOor opening relay CRzdoor closing relay C`S=car switch lH=1st floor hatchway motor 2H=2nd iioor hatchway motor 3l-1=3rd floor hatchway motor C=car door motor iT=lfst floor hatchway door motor switch 2T=2nd oor hatchway door motor switch 3T=3rd floor hatohway door motor switch iK=rst opening resistor relay 2li-:second opening resistor relay 3K=first closing resistor relay Kzsecond closing resistor relay on door only lN=interlock coil at 1st oor 2li-:interlock coil at 2nd floor v. 3N=interlock coil at 3rd floor LO :limit switch on opening (operated by con troller) LC-:limit switch on closing (operated by con- Y troller) y OLi=lst opening cam on door and gate (operated by controller) Y 01.2 :2nd opening `cam on door and gate (operated by controller) CL3=1st closing cam (operated by controller) CL4=9ndclosing cam on gate only (operated by controller) Referring more particularly to the drawings, I have illustrated a section of an elevator hatchway having a front wall IB and side Walls Il and l2. The section of the hatchway is taken at a floor landing, and any suitable door, such as a single door, a two-speed door, or center opening doors, maybe provided at the landing.

For convenience, I have illustrated the landing as provided with a pair of horizontally sliding center opening doors I 3 and I4. The other landings (not shown) may be provided With doors of the same style or any other suitable style. The doors are provided with suitable hangers i5, I6, il and I8 by which they may be suspended on an overhead track rail i9 in the usual manner so that they may slide toward the center in closing and away from it in opening.

The means for operating these doors comprises a pair of door operating cables 20 and 2l mounted upon and passing around a pair of

sheaves

22 and 23 attached to the track rail construction. The under ends of the cables are attached to the hanger I1 and the upper ends are attached to the hanger It, so that rotation of the sheaves will pull the cables to open or to close the doors. The cables may be constructed of iron covered with rubber as described in Patent No. 1,966,182, issued J'uly 10, 1934.

The means for operating the sheaves comprises an electric motor 3H mounted by means of a bracket 25 upon the sidewall II of the hatchway and provided with a pinion 26 for opera-ting a belt 21 to rotate a pulley 28 mounted on the shaft of the sheave 23. With this construction, rotation of the motor 3H in one direction will cause the sheave 28 to operate the cables to open the hatchway doors and operation of the motor in the opposite direction will cause the cables to close the hatchway doors.

A car 3U, of which only the front wall 3| and the

side walls

32 and 33 are shown, is disposed in the hatchway in position opposite the hatchway doors I3 and It. The car is provided with a pair of horizontally sliding

center opening doors

35 and 35 which are suspended from an overhead track rail 31 by a plurality of

hangers

38, 39, 40 and 4I.

The means for moving the car doors to their open or to their closed position includes an electric motor C provided with a foot plate 42 by means of which it is secured to the roof of the car 3i). The motor is provided with a driving pulley or wheel 43 over which a driving belt 44 passes to a driven pulley or sheave 45, mounted upon the outer end of a shaft 46, the inner end of which is mounted in a suitable bearing 41 bolted or otherwise secured to the roof of the car. On the shaft 46, between the bearing 41 and the sheave 45, is mounted a sprocket Wheel 48, over which passes a sprocket chain 49. The sprocket wheel 48 is connected to the driven sheave so that rotation of the sheave effects a corresponding rotation of the sprocket wheel. The upper end of the sprocket chain is attached to a bracket v5I attached to the

hangers

38 and 39 of the car door 35 and its under end is secured to a bracket 52 mounted on the hangers 4U and 4I of the door 36. A second sprocket chain 53 is supported on a sprocket wheel 54 and has its upper end connected to the bracket 5I on the door 35 and its under end connected to the bracket 52 on the door 36.

As may be seen in Fig. 2, if the motor C rotates in the direction of the arrow 55, it causes the operating mechanism, comprising the pulley 43, belt 44, sheave 45, sprocket wheel 48 and the chain G9, to pull on the bracket 52 to move the door 36 to its open position. At the same time, the operation of the door 35 causes its bracket 52 to pull on the lower end of the chain 53 and thereby causes its upper end to pull on the bracket 5I and thus cause the door 35 to move to its open position simultaneously with the opening motion of the door 36. It will also be apparent that when the motor is reversed, the chain will be operated by the sprocket wheel 48 to move the

doors

35 and 36 to their center closing position.

The door operating mechanism may be used in an elevator system serving any desired number of floors. However, in the present case, I have assumed, for the sake of simplicity, that illustrating it in connection with the first, second and third floors will enable any one to clearly understand the system. In the drawings, the car is shown at the third floor, `where the motor 3H has been provided for operating the hatchway doors at that floor. The hatchway doors at the other floors will be similar to the pair of hatchway doors for the third floor and each pair of doors will be provided with similar door operating mechanism. In the control circuit shown in Fig. 5, the armatures of the hatchway door motors are indicated as SHA for the third floor motor, 2HA for the second floor motor, and IHA for the first floor motor. Similarly, the field windings for these motors are indicated as 3HF for the third floor, ZHF for the second oor, and II-IF for the rst floor. The armature for the car door motor is indicated as CA and the eld winding for that motor as CF.

The operation of the motors to open or to close the doors may be controlled by operating a car switch CS. When the switch is moved to the left, a door opening relay OR is disposed to be energized to connect the car door motor and the hatchway door motor at the hatchway floor at which the car is standing to operate to open the doors. When the switch is moved to the right, a door closing relay CR is disposed to be energized to connect the car door motor and the hatchway door motor at which the car is standing to close the doors. f

The hatchway door motors and the car door motor are preferably of the series wound directcurrent type. The armatures and field windings of the hatchway door motors are connected in series, with the armatures in parallel with each other and with the eld windings in parallel with each other, but each hatchway landing is provided with a switch disposed to be operated by an inductor relay on the car when it stops at that landing for connecting only the eld Winding and the armature winding for the door motor at that landing for energization by the opening or the closing relay.

'I'he oor switch for the first floor is designated as iT, that for the second floor as 2T, and that for the third floor as 3T. The inductor relay on the car is indicated as T andA is connected to be controlled by a speed governor, for instance,

such as indicated by the ball governor G. While x the car isoperating, the ball governor prevents energization of the inductor relay T, but, when the car comes to a stop at a floor, the lball governor closes its contact members to energize the inductor relay so that it will operate the inductor switch at the floor at which the stop is made.

An adjustable resistor rl is disposed between the armatures andthe lield windings of the hatchway door motors whereby the amount of effective resistance in the resistor may be selected to cause the armature and eld windings to operate in their most eicient manner.

A resistor r2 is provided for controlling the amount of current through the armatures of the hatchway door motors so that the speed of the motors in starting. and stopping may be con trolled as desired.

The armature CA and the eld winding CF of the car door motor are connected in series, and

a resistor r3 is provided for adjusting the curthe right time, the system is provided with a,

controller L for connecting the resistors in the motor circuits in accordance with the position of the car doors and the hatchway doors at which the car is standing. The controller is mounted upon the top of the car and is operated by the sprocket wheel 54. The use of the sprocket wheel for operating the controller and also for supporting the chain 53 aords a simple construction whereby the controller is operated in accordance with the movement of the car doors. A chain is used instead of a cable so that the position of the controller will always correspondl exactly with the position of the doors.

The controller is provided with cam operated switches OLI, OL2, CL3, CL4, LO and LC.

The switches OLI and OL2 control the energization of a rst opening resistor relay IK and a second opening resistor relay 2K for controlling Value of the resistors 1'2 and r4 in the circuits of the armatures of the car door motor and the hatchway door motor at the floor at which the oar is stopped while the doors are being opened. The switch CL3 controls the first closing resistor relay 3K in the resistor circuits r2 and r4 during the closing operation of the doors. The cam switch CL4 controls, in conjunction with a switch on the closing relay, a circuit through the resistor r4 in the circuit of the car door motor in order to place a positive check on the movement of the car door when it closes to within a predetermined distance of its completely closed position. A second closing resistor relay 4K is provided for controlling the amount of the resistor r2 in the circuit of the hatchway door armature when the hatchway door closes to within a predetermined distance of its closed position.

The opening relay OR is provided with a time delay device such as a condenser 'I6 arranged to discharge through the relay coil when it is deenergized by the opening ci the limit switch LO. 'I'he discharge of the condenser through the relay coil provides approximately one-half second delay inthe opening of the relay thus giving the doors time to complete their opening movement after the limit switch opens and also causes the doors to be held momentarily against their bumpers to absorb their rebound. The closing relay CR is provided with a time delay means such as a condenser 1I to control the last closing action of the doors in the same manner. If desired, any other time delay means instead of condensers may be employed.

In order to prevent the opening of any of the hatchway doors while the car is not standing thereat and also to prevent operation of the car while a hatchway door is open, each hatchway door is provided with a pawl and ratchet locking mechanism 66. The mechanism comprises a pawl or latch 6I pivotally mounted in a lock casing 62 secured to the hatchway wall in such position that the pawl will fall into the notched portion of a bar 63 mounted on the top portions of the hangers I5 and I6 on the door I3 when the door is completing its closing movement. An electromagnetic coil 3N is mounted, by means of a bolt 66, on the inside of the lock casing to attract, when energized, an armature 65 attached to the pawl. When the coil is energized, the armature 65 is attracted thereto and thus raises the pawl out of the notched portion of the bar and holds it above the bar so that the door may be readily moved to its open position. The pawl 6I is weighted sufliciently to fall into its locking position in the notched or ratchet portion of the bar when the door is in or near its closed position and. the coil 3N is deenergized. The pawl and armature are provided with an arm 66 for operating a pair of contact members 3NI disposed in the circuit for the second closing resistor relay 4K. By this it will be apparent that the relay 4K will be energized only when the lock at a hatchway door is unlocked to permitv the openin-g of the hatchway door.

In accordance with my invention, the locking bar 63 is provided with a plurality of notches 61, 68 and 69 of different sizes to receive the pawl 6I when the door is being locked. The ledges or teeth 61a and 68a of the notches 61 vand 68 are made lower than the ledge 69a for the notch 69, so that the pawl will close the contact members 3NI when it slips off the ledge 69a into the notch 69 but will not open those contact members when it moves over the ledges 68a and 61a on moving from the notch 69 to either the notch 68 or 61 as `the door completes its movement into its fully closed position. y

It is to be understood that an interlocking switch is associated with each lock at each hatch- Way door opening, the interlocking switch for the iirst floor being indicated as INI, that for the second iioor as ZNI, and that for the third 'loor as 3NI.

The second closing resistor relay 4K is also provided with a pair of contact members 4K2 which may be disposed in the car control circuit to prevent operation of the car While the hatchway door is unlocked and also to permit the car to proceed on its trip as soon as the pawl 6I is disposed in the locking notch 69.

The operation of the system is as follows: 4It will be assumed that the car is in operation and is slowing down to a stop at the third floor. Underthese conditions the interlock 66 on the corridor door is closed, with its latch 6I inthe notch 61 andthe switch SNI closed, thus energizing the second closing resistor relay 4K which, in turn, has its contact members 4K2 closed in the car to permit the operation of the car. The controller switchesl CL4, CL3 and LO are closed by reason of the Dosi-tion of the controller L.

The slowing down of vthe car causes its governor G to close its contact members GI t-hus energizing the inductor relay coil T on the car to operate the inductor plate 3T at the third oor to close its switches 3TI, 3T2 and 3T3. The-closing of the switches 3TI and 3T2 prepares the circuits of the hatchway door motor 3H atl the third floor for operation when the door is to be opened. The closing of the contact members 3T3 prepares a circuit for energizing the hatch door inductor coil 3N to unlock the corridor doors when they are to be opened. y

As the car comes into the third floor, it is assumed that the attendant throws the car switch CS to open the

car doors

35 and 36 to unlock and open the hatchway doors I3 and I4 at the third floor.v The closing of the contact members CSI energizes the door opening relay OR by the circuit L-|- I, OR, LO, CSI, L-I. The energized relay OR closes contact members O-R6 and thereby completes the circuit for energizing the hatch door interlock coil 6N at the third floor which causes it to lift the pawl 6I out of the locking notch 61, thus unlocking the corridor doors. The

unlocking movement of the pawl also opens thecar control circuit to move the car while the hatchway doors are open.

The closing of the contact members ORI and OR2 energizes the field winding BHF and the armature 3HA of the door motor at the third oor -to cause that motor to move the -hatchway doors at the third floor to their open position. The motor circuit extends lThe closing of the contact members ORS and ORA energizes the iield winding CF and the armature CA of the car door motor to move the car doors to their open position, through the circuit rPhe energized motor moves the

chains

49 and 53 to open the car doors and the action of the chains rotates the controller L to restore its limit switch contact members LC to their closed position. By the time the doors are approximately one inch open, the chains rotate the controller to restore its contact members CL4 :to their open position. When the doors are, say, four inches open, the controller restores its contact members CL3 to their open position. As the car doors continue their travel toward their open position and are, say, four inches from their full open position, the controller L closes its first decelerating contact members OLIl, thereby energizing the rst opening resistor relay IK which, in turn, closes its contact members IKI and IK2. The closing of the contact members IK! inserts a predetermined portion of the resistor r2 in parallel with the armature 3HA of the hatch door motor to decelerate that motor to slow down the hatchway doors as they near their open position. The closing of the contact members IK2 inserts a predetermined portion of the resistor r4 in parallel with the armature CA of the car door motor to decelerate that motor to slow down the car door as it nears its full open position. As the doors arrive at, say, one inch from their full open position, the controller L is operated to close its second decelerating switch OL2, thereby energizing the second opening resistor relay 2K to close its contact members 2KI and 2K2 by the circuit L-i-I, 2K, OL2, ORS, L-I

The closing of the contact members 2KI inserts a predetermined portion of the resistor r2 in parallel with the armature 3HA to decrease the speed of the hatchway door motor so that the l hatchway doors will slow down softly at the end of their opening travel. The closing of the contact members 2K2 inserts a predetermined portion of the resistor r4 in parallel with the armature CA of the car door motor to decelerate that motor to slow down the car doors so that they move softly into their full open position.

In the diagram of Fig. 5, the resistors r2 and r4 are shown as connected at various points by adjustable arrows controlled by opening and closlng switches. It should be understood that in actual practice the lcircuits controlled by the opening and closing switches may be connected to these resistors at any point or points selected by the elevator engineer and that it is common practice to make these connections when'the elevator is installed and to change or modify them in lany manner desired to secure smooth operation of the hatch door motors and the car door motors in opening and closing the doors with which they are associated. Y

As the car doors reach their open position, the controller L is operated to open its limit switch LO 'to deenergize the opening relay OR. However, linasmuch as, this relay is associated with its condenser 10, it staysV energized for a very short -time to give'the door motors time tov ccmplete their openingmovement after the limit switch opens and also causes the doors to be held in their full open position momentarily against their bumpers to absorb their rebound. The opening of the contact members ORI and GRZ of the deenergized relay OR deenergizes the field winding 3I-IF and the armature Winding 3HA of the hatch door motor, thereby stopping that motor. The opening of the contact members OR3 and OR4 deenergizes the field winding CF and the armature CA of the car door motor, thereby stopping that motor. 'Ihe opening of the contact members ORS deenergizes the first opening and the second opening resistor relaysl IK and 2K to open their contact members for disconnecting the resistor r2 and r4 from the circuits fo-r the armature CA and armature SHA.

The opening of the contact members ORG deenergizes the hatch door interlock coil 3N which causes the pawl 6I to drop down on the ledge 69a of the bar 63. This ledge, however, prevents the door from being locked and also prevents the closing of the contact members 3NI to move the car. It will be obvious that the pawl 6I cannot move into locking position until the hatchway door is moved suiiciently toward its closing position to permit the pawl to drop off the ledge or upper surface69a of the bar and into one of the notches 51, 68 or 69.

It will be assumed now that the passengers have entered or left the car and that the car attendant moves the car switch CS in a clockwise direction to eiect the closing of the car doo-rs and the hatchway doors. The movement of the switch closes its contact members CS2, thereby energizing the door closing relay CR through the circuit L| I, CR, LC, CS2, L- I. The closing of the contact members CRI and CR2 reverses the energization of the hatch door motor to close the hatch doors, by the circuit L-l-I, CRZ, 3HF, 3T2, CRI, TI, 3HA, 3TI

The energization of the hatch door motor 3H causes the hatch doors to move toward their closed position.

The closing of the contact members CR3 and CR4 energizes the car door motor C through the circuit L-i-I, CRII, CF, C'R3, r3, CA, L-I

The energized car door motor moves the car doors toward their closed position and in doing so causes the

chains

49 and 53 to rotate the controller L so that it restores the limit switch LO to its closed position. As the car door moves, say, one inch away from its open position, the controller restores its switch OL2 to its open position, and, as the car door moves, say, four inches away from its open position, the controller restores the switch 'OLI to its open position, to prepare them,h for closing at the proper time in the opening sequence of the doors.

As the doors arrive at, say, four inches from their closed position, the controller L closes its switch CL3, thereby completing the circuit for energizing the first closing resistor relay 3K to close its contact members 3KI and 3K2. The closing of the contact members 3KI inserts a predetermined portion of the resistor r2 in parallel with the armature SHA of the hatch door motor to check its speed so that the door will slow down as it nears its fully closed position. The closing of the contact members 3K2 inserts a predetermined portion of the resistor r4 in parallel with the armature CA of the car door motor to cause that motor to decelerate and thus slow down the movement of the car door as its nears its fully closed position.

As the car door gets within, say, one inch of its closed position, the controller L closes its switch CL4, thereby inserting a predetermined portion of the resistor r4 in parallel circuit with the armature CA to positively check the car door motor as the car door reaches the desired predetermined distance from its full closed position. It is to be noted that this last checking of the car door motor is controlled by the car doors reaching a predetermined point on closing and that it is independent of the nal checking oi the hatchway door motor.

As the hatch doors reach a predetermined dis'- tance from their fully closed position, the pawl 6| drops off the ledge 69a and into the notch 69, thereby locking the hatch doors against being opened until the interlocking coil 3N is again energized. The movement of the pawl 6l into the notch effects the closing of the contact members SNI, thereby energizing the second closing resistor relay 4K to close its contact members KI and 4K2. The closing of the Contact members 4Kl inserts a predetermined amount of the resistor r2 in parallel with the armature 3HA oi the hatch door motor to decelerate that motor to cause the hatch doors to close softly. Hence, it is seen that this nal checking of the hatch door motor is effected by the hatch doors reaching a predetermined closing position and that it is independent of the final checking of the car door motor.

The car doors and the hatch doors are now almost closed and the hatch door is locked against being reopened. Hence, there is no reason Why the car should not be permitted to depart and not have to wait until the doors are tightly closed. It is for this reason that the contact members 4K2 of the relay BK are disposed to close in the car controlled circuit when the pawl 6 l falls into the notch 69 and locks the door against opening but permits it to finish its closing movement.

When the doors are about one-half inch from their fully closed posi-tion, the controller opens its limit switch LC, ythereby opening the circuit for the door closing relay CRKbut the condenser 1| on this relay maintains it in its energized condition for a time suilcient for the motors to move the doors to their fully closed position and also causes the motors to hold the doors momentarily against their bumpers to absorb the rebound therefrom. When the relay CR becomes deenergized, it opens its contact members. The opening of the contact members CRI and CRE deu energizes the hatch door motor. The opening of the contact members CRS and CRA deenergizes the car door motor. The opening of the contact members CRS removes a predetermined portion of .the resistor r4 from the circuit of the armature CA of the car door motor. The opening of the contact members CRB deenergizes the first closing resistor relay 3K which restores its contact members SKI and 3K2 to their open position.

As the hatch doors move from their closing position where the latch 6| dropped into the notch 69 to their completely closed position, the latch slides over the ledge 68a into the notch 68 and then over the ledge Bla into the nal notch 61 which locks the doors in their completely -clcsed position. However, the ledges 68a and 61a are not high enough to cause the pawl, as it slips over them from notch to notch, to open the contact members SNI. Inasmuch as these contact members stay closed, the relay 4K remains energized and thus the car is able to leave the third iioor.

It will be assumed that car started to leave the iicor as the doors closed to the point where the latch fell into the notch 59, as the car increased its speed, the governor G opened its contact members Gl, thereby deenergizing the inductor relay T to open the switches 3TH, ST2 and 3T3 to prevent any operation of the hatchway door circuit at the third oor.

The car doors and the hatchway doors are now in their completely closed position and the dooroperating system will be ready for its next operation when the car slows down Iat the next floor at which a stop is to be made. k

By the foregoing description it will be appreciated that have provided a door operating system requiring very simple apparatus arranged in a simple and inexpensive manner; that the motors are provided with individual con-trol systems which may be adjusted to meet the various conditions under which such systems are installed; that a special lock and interlock switch permits the locking of the doors before they are fully closed and permits the car to be moved away from f a floor before the hatch doors at that floor are tightly closed but when they are safely closed and that the operating relays are provided with means which cause the doors to be held momentarily against their bumpers in their closed or open position at the end of their movement at least for a sufficient `time to permit them to absorb the rebound effect of the bumpers.

Although I have illustrated and described only one specific embodiment of my invention, it is to be understood that changes ther-ein and modifications there-of may be made without departing from its spirit and scope.

I claim as my invention:

i. In an elevator door opera-ting System for operating a hatchway door at Va landing and a door on the car in the elevator, an electric motor for moving the hatchway door, an electric motor for moving the car door, switches for starting, stopping and reversing the motors, means responsive to operation of one of the doors for decelerating both motors at predetermined points in their movements and responsive to movement of said one door to within a predetermined distance of its completely closed position for further decelerating the motor of said one door for its nal closing movement, and means responsive to a closing movement of the other of said doors to within a predetermined distance of its completely closed position for further decelerating the motor of said other door in its final closing movement, whereby both doors lare checked by common means at `one stage of their travel and each door is checked by its own means when it is a predetermined distance from its final position.

2. In an elevator door operating system for operating a hatchway door at a landing and a door on the car in the elevator, ian electric motor for moving the hatchway door, an electric motor for moving the car door, switches for starting, stopping and reversing the motors, a resistorfor each motor, means responsive to operation of one of the doors for 4controlling the resistors of both motors to decelerate their speed at predetermined points and responsive to movement of said one door to within a predetermined distance of its completely closed position for controlling the resistor of the motor for that said one door to decelerate that motor for its final closing movement, and means responsive yto a closing movement of the other of said doors to Within a predetermined distance of its completely closed position for controlling the resistor of -the motor of said other door to decelerate that motor for its iinal closing movement, whereby both doors are checked by a common means at one stage of their travel and each dooris checked by its own means when it is a predetermined distance from its final position.

3. In an elevator door operating system, for operating a door at a corridor opening and a door on a car in the elevator, an electric motor for moving the corridor door, an electric motor for moving the -car door, switches for starting and stopping the motors, a resistor for each motor, means responsive to a predetermined operation of the car door for controlling the resistors of each motor to decelerate the motors and responsive to movement of the car door to within a predetermined distance of its completely closed position for controlling the resistor of the car door motor to decelerate that motor for its nal door closing movement, and means responsive to a closing movemen-t of the corridor door to within a predetermined distance of its completely closed position for controlling the resistor of the corridor motor to decelerate that motor for its final closing movement, whereby both motors are checked by a common means at one stage of their movement and by individual means at their nal closing movement.

4. In an elevator door operating system, a motor for moving the door, an opening relay, means for connecting the opening relay for energization, means responsive to energization of the opening relay to cause energization of the motor to move the door to its open position, a limit switch for controlling the energization of the opening relay, means responsive to a predetermined opening movement of the door or operating the limit switch to disconnect the opening relay from its source of energization, and a tim-e delay means associated with the opening relay for preventing that relay from deenergizing the motor for a predetermined time after the opening of its limit switch whereby the door motor will complete its opening movement after the limit switch opens and will hold the door momentarily against its bumpers to absorb their rebound.

5. In an elevator Ydoor operating system for `operating a sliding door at a corridor opening and a door on the car in the elevator, a motor for moving the corridor door, a motor for moving the car door, an opening relay and a closing relay for connecting and disconnecting the motors with a source of energy and for reversing their direction of operation, a limit switch for each relay, means responsive to a predetermined opening movement of the car door for operating the limit switch associated with the opening relay to disconnect that relay from its source of. energization, means responsive to a predetermined closing movement of the car door for operating the limit switch associated with the closing relay to disconnect that relay from its source of energy, a time delay means associated with each relay for preventing deenergization of the motors for a predetermined time after the opening of the relay to cause the motors to complete the opening movement or the closing movement of the doors after the opening of a limit switch and to hold them momentarily against their bumpers to absorb their rebound.

6. In a door operating system for a door 'on a car in an elevator hatchway and a door in the hatchway, a motor for the .car door, a motor for the hatchway door, an opening relayand a closing relay for connecting and disconnecting the motors with respect to a source of energy and for reversing their direction of operation, means responsive tol a closing movement of the car door to a predetermined point for decelerating both motors and responsive to a further closing movement of the car door for further decelerating the car door motor, a lock comprising a notched bar and a pawl responsive to a closing movement of the hatchway door to nearly its closed position for locking that door, means responsive to the locking operation of the lock for further decelerating the hatchway door motor, a limit switch for the closing relay responsive to a still further closing movement of the car door for disconnecting the closing relay from itssource of energy, a time-delay means associated with said closing relay for preventing deen-ergization of that relay for a predetermined time afterit is disconnected to cause the motors to complete the closing movement of the doors after the opening of the limit switch and to hold them momentarily against their bumpers to absorb their rebound.

7. In a door operating system for a door on a car in an elevator hatchway and a door in the hatchway, a motor for operating the hatchway door, a motor for operating the car door, an opening relay and a closing relay for connecting and disconnecting the motors with respect to a source of energy and for reversing their direction of operation, a pawl and ratchet lock for locking the hatchway door comprising a notched bar mounted on the hatchway door and a pawl pivotally mounted on the hatchway walls in position to engage one of the notches when the hatchway door is nearly closed and to engage another notch when the door iscompletely closed for locking the door, means responsive to operation of the car door to a predetermined point for decelerating both motors and responsive to movement of said car door to within a predetermined distance of its final position for decelerating the motor of said car door for its final movement, means responsive to a locking operationk of the lock when the hatchway door is nearly closed for decelerating the motor of the hatchway door for its final movement and for preparing for operation a control system of the car, a limit switch for each relay, means responsive to a predetermined movement of the car door V:for operating the limit switch associated with the opening relay to disconnect that relay from its source of deenergization, means responsive toa predetermined closing movement of the car door for operating the limit switch associated with the closing relay to disconnect that relay from its source of energy, a time delay means associated with each relay for preventing deenergization of that relay for a predetermined time after it is disconnected to cause the motors to complete the opening-or closing movement of the doors after the opening of the limit switch and to hold them momentarily against their bumpers to absorb their rebound.

8. In a door operating system for an elevator,

a door, an electric motor for opening and closing the door, switches for starting, stopping and reversing the motor, a lock for the door, and means responsive to a locking operation of the look when the door nears its closed position for decelerating the motor during the latter part o-f the movement of the door to its closed position.

9. In an elevator door operating system for operating a hatchway door at a landing and a door on the car in the elevator, an electric motor for moving the hatchWay door, an electric moto-r for moving the car door, switches for starting, stopping and reversing the motors, means responsive to operation of one of the doors for decelerating both motors at predetermined points in their movements and responsive to movement of said one door to Within a predetermined distance of its completely closed position for further decelerating the motor of said one door for its nal closing movement, a lock for the other of said doors disposed to be locked by the closing movement of said other door, and means responsive to the locking operation of said lock for further decelerating the motor of said other door in its nal closing movement, whereby both doors are checked by common means at one l stage of their travel and each door is checked by its own means when it is a predetermined dis'- tanoe from its nal position.

HAROLD V. MCCORMICK.