US1400215A - Elevator-door-operating device - Google Patents

Description

L. E. GROAT AND F. F. BRUSH. ELEVATOR DOOR OPERATING DEVICE.

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APPLICATION FILED MAY 26, 1919. 13

6 SHEETS-SHEET 2.

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E rzdezzfons r2 Graczf L. E. GROAT AND F. F. BRUSH. ELEVATOR DOOR OPERATING DEVICE. APPLICATION FILED MAY 26, 1919. 1,400,215.

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L. E. GROAT A-ND F. F. BRUSH. ELEVATOR DOOR OPERATING DEVICE.

Y v APPLICATION FILED MAYZB 1919-. 1,400,215; Patented Dec. 13, 1921.

6 SHEETS-SHEET 1- L. E. GROAT AND F; F. BRUSH; ELEVATOR DOOR OPERATING DEVICE.

. APPLICATION FILED MAY 25- l9.l 9-

' Patented D60. 13, 1921.

6 SHEETS-SHEET 5.

Alllll \HIHI 2/} J jiwelafor-s 754 izow 1% mj. as/ix UNITED STATES PATENT OFFICE.

LUTHER E. GROAT AND FREDERICK F. BRUSH, OF LOS ANGELES, CALIFORNIA, ASSIGNORS TO ELEVATOR SAFETY APPLIANCE COMPANY, A CORPORATION OF CALIFORNIA.

ELEVATOR-DOOR-OPERATING DEVICE.

Application filed May 26,

T 0 all whom it may concern:

Be it known that we, LUTHER E. GRoA'r and FREDERICK F. BRUSH, both citizens of the United States, and both residing at Los An eles, in the county of Los Angeles, State of (Jalitornia, have invented a new anduseinclude means for inhibiting the opening of the door at all times that the car is in motion and at all times that the car is at rest except when it registers properly with a floor. The interlocks also include means for shutting off power from the door closing mechanism in the event that the door meets an obstruction, as for instance, it it, by accident, closes on a person, and means for looking the car in position at the floor at all times except when the door is closed.

A. further object of the invention is to provide a door closing mechanism which will start the door from a position at rest and accelerate it uniformly and smoothly, decelerating to a second position of rest with a. large excess of power on either end of the stroke.

A further object of the invention is to provide a door operating device which may be driven by an electric motor and in which the interlock features necessary in connection with such a device are applied to the electric circuit of that motor.

A further object of the invention is to provide a mechanism for opening and closing the doors which will have a. small number of parts and be very rugged and compact in construction.

A further object of the invention is to provide a novel means for oiling.

A. further object of the invention is to provide a door operating mechanism which is carried on the elevator car and which Specification of Letters Patent.

Patented Dec. 13, 1921.

1919. Serial No. 299,979.

successively comes into position opposite a door locking and moving device at each door, together with means for throwing said mechanism into operative relationship with said device when it is desired to operate the door, said mechanism having at all other times a considerable clearance from said device.

Further objects and advantages will be made evident hereinafter.

Referring to the drawings, which are for illustrative purposes only,

Figure 1 is a somewhat diagrammatic view of an elevator hatchway with a car in place therein.

Fig. 2 is a front view of the same parts showing the method of operating the door.

Fig. 3 is a SlCQ view partly in section of the elevator door operating mechanism.

Fig. 4 a section on a plane represented by the line a d of Fig. 3.

Fig. 5 is a section on a plane represented by the line 55 of Fig. 4.

Fig. 6 is section on a plane represented by the line 66 of Fig. 3.

Fig. 7 is a section through the magneticbrake on a plane represented by the line 7-7 of Fig. 5.

Fig. 8 is a diagram of connections of the apparatus as applied to a hydraulic elevator.

Fig. 9 is a diagram of connections as applied to an electric elevator.

Fig. 10 is a perspective view of one of the limit switches.

Fig. 11 is a side elevation of the door actuating and locking device.

Fig. 12 is an end view of same.

Fig. 13 is a plan view of same.

Fig. 14 is a section on a plane represented by the line 14.14 of 111g. 11.

Fig. 15 is a section on a plane represented by the line 1515 of Fig. 13.

Fig. 16 is a section on a plane represented by the line 1616 of Fig. 15.

In Fig. 1 an elevator hatchway is shown in which a car 22 is moved by means of a hydraulic plunger 23, a hydraulic elevator being selected merely for convenience of illustration, our invention being applicable s will r a i y e un er tand to anv ype of elevator. Located at each of the floors 24 is a door 25 and a door actuating and locking device 26. Carried on the top of the car is a door operating mechanism 27. The door actuating and locking devices 26 operates the door through a throw bar 28 pivoted to v the building structure at 29., the throw bar being driven through a toggle 3O composed oftwo links 31 and 32 which may be broken if necessary from the inside of the hatchway, or with certain limitations from the outside of'the hatchway, to allow the door to be opened in the event that the actuating device becomes inoperative for any reason. The driving toggle 30 is so constructed that it is rigid at all times except when manually operated to allow the door to be opened. A counter weight 33 is provided on an extension 34- of the throw bar 28 so that the door at all times tends to close under the action of gravity, the door being shown in closed position in Fig. 2, the open position being indicated by dotted lines 35 in that figure. The door locking device is provided with projections 36 and 37 by means of which the door is interlocked, locked and moved as will hereinafter be explained.

' The door operating mechanismv 27 illus trated in detail in Figs. 3 to 7 inclusive consists of a main frame 40- having journaled in the upper portion thereof a worm shaft 41 carrying a worm 42 and mounted in any suitable form of bearings such as shown.

The shaft 41 is driven by an electric motor 43 and is provided with a magnetic brake 44. The magnetic brake 44 consists of brake wheel 45, brake shoes 46 pivoted at 4;

and connected to cores 48 and 49 which extend inside a coil or solenoid 50. The cores 48 and 49 are held apart by springs 51, and when so held apart, the shoes 46 contact with the wheel giving the braking action. Whenever the coil 50 is energized the cores 48 and 49 exert a mutual attraction, being pulled inwardly until the ends of the brake shoes 46 strike against the frame 52 in which the whole device is carried. The coil 50 is connected in series with the field 53 of the motor 43, the armature of which is shown at 54 in the diagrams.

Meshing with'the worm 42 is a worm gear 60, this gear being keyed on a main shaft 61 carried in bearings 62 and 63 supported by the mainframe 40. The outer end of the shaft 61 and the bearing 62 is protected by a suitable dust cap 64. Mounted on the opposite end of the shaft 61 is a crank 65 having acrank pin 66 projecting from 'the extreme outer end thereof. The crank pin 66 turns in .a crank pin block70 which is free to slide up and down n a cross-head 71, this cross-head having a. T shaped bottom 72 fitting in a slide formed in the bottom of the frame 4Q, being retained in place therein by a plate 73. The c'ross-head 7 is thus of these members 78 being hereinafter referred to as a closing driving strip and the other member 79 being referred to as an opening driving strip. Secured to a pin 80 on the finger 75 is an opening tension spring 81, having its other end secured on apin '82 secured in the cross-head 71. A closing tension spring 83 is secured on a pin 84 carried by the finger 7 4, the other end being secured on a pin 85 carried on the cross-head 71 The spring 81 is so constructed that it is slightly stronger than necessary to openth-J door, and the spring 83 has approximately twice the tension of the spring 81. The driving strlps 78and 79 pro ect outwardly from the side of the mechanism so that they can readily engagethe projections 36 and 37 as .will hereinafter be explained.

Secured by means of rivets to the 65 is a cam plate 91., this plate having a cam surface 92 formed on its outer edge termihating near either end thereof angle portion 93'; Secured by means 0 screws 94 and 95 to the plate 91 ar auxiliary cams 96 and'97. These cams ar provided with inclined surfaces 98 and 99 which in effect may be adjustable continuations of the surface 92 and form one side of grooves 100 and 101 whose purpose will hereinafter be explained.

Turning'freely in the frame 40 are three shafts 116. 111 and 112 located as shown in Fig. 5. Each of these shafts is provided with a crankarm carrying pins 113, 114 and 115, these pins fitting in the grooves 106 and 101 previously described. Each of the shafts 110, 111 and 1.12 carries an arm to which is fixed a moving contact as snown in Fig. 10. These moving contacts with their coiiperat-ing stationary contacts will, for convenience, be referred to as the closing limit switch 121, the opening limit switch 122 and the interlock switch 123 whose method of operation and purpose will be described in connection with thedia gramsf The switches 121, 122 and 123 are carried in switch bones 125 carried as shown in Figs. 3 and 6 on the frame 40."

The finger 75 is provided with a stop to limit its outward movement and with a small lug-131 which rests against a bar 132.

F ig. '4, being pivoted at 136 so that the forin aright-j move up and down. The bars 13-2 1 5 ere normally held togcther by a tee sion'spring 187 and each of these hers is connec ' h rod 138 or 139 with contacts pl ch belies 14:0

these contacts forio' r regis ering SW" 8 anti do swit h 151 e 0 c tiloor tei ower her the normal po The floor res;

open wneneve' beyond its 330 tmg the her 16-22 b e O JSCt of this device to switch 150 whei ever the open ving str'p 79 fails to ind the pro" cti in its per position. The n 151 is open rnenever the door jenios t essive pressure on the ur if the inclosed except n partially closed by 9 down into such no v slot 158 three l 154 having an v placed in the bottom or" the frame is t carried up by th crank pin 1 I eiocl: 40 end the gear and the care te 91 so that the whole interior 0' the niecha sin is at all tiines well v ricrfitecl, the parts being so formed that orip from the mechanism is returned to n of the frame 10.

A -y convenl 3 is may he provided it ividual doors and for tlie medium of The apparatus 1131 76 18 a conelo oggetlier at the blocks plate 168 by tee forina building tluc- Loving 1, casting 166 W1; 1 VJ), O11 \l 1& Cl 1: This niain lever .iiogcetions 38 and 3? i l J "l to these projections bebe eled a Wl at 169 a having the relative lengt 1 shown is Fig 11 Carried n opposite end of he lever t ""0 which presses againsbetwee i 1T0 bein 3 in 1e, Pivoted y means of pin 1T5 pivoted on a pin 177 carried in a shoe 1'? 8 which in turn is pivoted on a pin 17 9 carried in the casting 166. The shoe 178 is provided with a rippine surface 180 which isstraight and practi ally parallel with the line of motion of the casting 166 when the toggle formed by the members 171 and 1Y6 is closed in he posi on shown in Fig. 15. This gripping en cc 1180 is caught by a roller 181 carried in a ide 182 end held in the position shown by a compression spring 183, the limit of its motion being governed by an adjustable nut 184; on the outer end of stem 185 which l J passes through one of the members 162. The

roller 181 also is in contact in this position with an inclined surface 190 formed on the lower slide 181. It will be seen that with the parts in the position shown in Fig. 15 any attempt to move the door in the direction of the arrow A will force the roller 181 into g jainhing relationship between the surfaces 180 and 190 thus effectually looking the door against any movement.

It will he further evident that the main lever is rotated of l whenever in the directi "he arrow B around the pin 16? that e roller 170 acting on the inclined surface 1 will break the toggle, oullin the fllicontact with the d to be freely 1 and allowing;

It will he in -i the sur'ece 180 or some len locking action can. take place i several different positions thus door to be locked even if it is enema closed.

A bufi'er spring is provided to mine the position at rest of the cesti with relation to the end member 196 is proyided to which the ni 82 is pivoted.

The rnethod of elect cal coniection applied to electr'c 8 s in 9, in which one i e y wires feeding throuiz ia switch anal.

fuses 208. The supp y wi e 201 is connected by a 20? to l the t .tio

I! contacts or a counter relev The ot 4.1 l 1 Lil 6 counter eec i is-connected to e wir tso oons :at the c1 1 contacts i 1e ioltage across the arv w L iuetuie is above a piedeteiininec veins.

niar CODTQDlSIlt'lV set at approf niately ten per cent. of the normal "olt ge impressed on the g the relay then bei held open a counter electro-inotive force gener ter 11 this arm ture even when the motor 1:3 disconnects-l from the line so longias the arinatnze in motion. Inother words, the relay 205 is open at all times except when the motoris at rest or just about to come to rest, the objectof the relay 205 being to entirely cut oil the door operating-device at all time -when the elevator is in motion.

A car switch 210 is provided for manually interrupting the wiresj200, 201 and208 and a series of fuses 211 is inserted in the wire 201 which is connected to the series field 53 of the motor 54. The other terminal 01" the series field 53 is connected through the brake coil 50 by means of a wire 212 to the two contacts 213 and 214 of an opening relay 215 and a closing relay 216. The'armature 54 of the door operating motor is connected on one side to a wire 217 with the contacts 218 and 219 of the closing relay 216, the other side of the armature 54 being connected through a wire 220 with the contacts 221 and 222 of the opening relay 215. The wire 200 is connected to the contact 223 of theopening relay 215 and to the contact 224 of the closing relay 216. Bridging members 225 and 226 in the relays 215 and 216 are in contact as shown in Fig. 9 whenever the circuit to these relays is open, being pulled into an upper position whenever the coils and relays are energized.

The operating coil of the relay 215 is connected on one terminal to the floor registering switch 150 and the operating coil of the relay 216 is connected on one terminal to the door jamb switch 151. The other terminal of the coil of the relay 215 is connected through a wire 230 with a contact 231 of a door operating controller 500, the other terminal of the coil of the relay 216 being connected to a contact 232 of that controller. A contact 233 of that controller is connected through a wire 234 with the wire 200. The wire 208 is connected to the central point of the opening limit switch 122 and the closing limit switch 121. When the door is closed thelimits 121 and 122 are in the position shown in Fig. 9, the circuit between the wire 208 being closed through a wire 241 with the floor registering switch 150 and the circuit through a wire 242 being open to the door jamb switch .151.

For the purpose of preventing the manual control of the elevator from being operated when the door is open or in the process' of opening, we provide contacts 250 and 251 in the door operating controller 500, the contact 250 being connected through a wire 252 with one terminal of the interlock switch 123, this switch being closed when the door is closed, and being connected through a wire 253 with the elevator control cable. The contact 251 is com nected through a wire 254 with the center 255 of the elevator controller so that the main circuit to the elevator control is open at all times that connection is interrupted .the closing relay 316.

between the contacts 250 and 251. This occurs whenever the controller 500 is thrown open to open the door, the circuit remaining open until the door operating controller is thrown back into closed position. The conbetween the contacts 231 and233 being established at this time by means of rings 262 which are electrically connected. While a diagram drum top controller is shown for accomplishing this result, it is Obvious that other equivalent means might be used if desired. 7

Our invention can also be applied with ex cellent advantage to a hydraulic elevator,

the diagram of connections therefor being shown in Fig. 8. In this diagram of connections, main supply wires 300 and 301 are carried through a main switch 302 and main fuses 303, the wire 301 being connected to an auxiliary wire 304. The wire 301 is also carried through a water control switch 305 which is so arranged that it is closedwhenever the. water supply to the hydraulic plunger is shut off, being opened whenever water is turned into the plunger to operate the car. The wires 300, 304 and 301 are carried to a carswitch 310. The wire 304 is connected through fuses 311 with the series field 53 of the door operating motor 54 and through the brake coil 50, and a wire 312 to the contact 313 of the opening relay 315 and the contact 314 of the closing relay. 316.

One terminal of the armature 54 is connected through a wire 317 with the contacts 318 and 319 of the opening relay 315, the other terminal of the armature being connected througha wire 320 with the contacts 321 and322 of theclosing relay 316. The wire 300 is connected tocontact 330 of the openingrelay'315 and to a contact 33 1 of The door operating controller is shown diagrammatically at 340, the line m''a showing its closed position and the line g g its open position. Stationary contact fingers 341, 342, 343 and 344 are provided in the controller 340. The finger 341 is connected through a wire350 with the coil 351 of the opening relay 315, the other terminal of this c'oil being connected to a contact 352 of the interlock relay 353. The contact 342 s connec e t he coi 3. o he c o i g I6- lay 316, the other terminal of this coil being connected through a wire 355 with a door jainb switch 356, the other terminal of this switch being connected through awire 357 with one side of a closing limit switch 358.

The other terminal of this switch is connected through a wire 359 with the wire 301. This wire 301 is also connected to one terminal of an opening limit switch 360 the other terminal of this switch being connected through a wire 361 with a contact 362 on the interlock 353. The contact 343 is con nected through a wire 365 with a contact 366 on the interlock which is also connected through a wire 36? with a contact 368 on this interlock. The contact 370 of the interlock 353 is connected to the wire leading from the contact 342 to the closing relay coil 354. The contact 344 is connected through a wire 371 with a contact 372 of the interlock which is also connected to the coil 373 of the interlock, the other terminal of this coil being connected through floor registering switch'374 to a wire 375 which in turn is connected into the wire 304 at a point 376 just below the car switch 310.

The controller 340 is provided with seg ments 330 which connect the contacts 341 and 343 hen the switch is open. Contacts 331 connect the contacts 342, 343 and 344 all together when the switch is closed. For the puipos of providing locking means for the i g lover of the elevator we provide 111 l throw interlock sw1tch 390, the

JCUDTQ 35 center of 391 to suitable source of electric ower, this switch being adapted to be brown either to a contact 392 connecting an interlock coil 393 on the operating lever or to a contact 394 connected to the threshold light 395, the other terminals of the coil 303 and the threshold light 395 being connected to the other source of power. Whenever the coil 393 is energized, the manual opera lever of the elevator may be moved. but when this coil is deenergized the manual operating lever or" the elevator is locked.

The method of operation of an electric elevator having the diagram of connections illustrated in 9 will now be described.

1e e evator being at rest at any floor desired to go to any other floor. The

troller 255 is then manipulated to concor.

trol the armature 209 by any convenient method of connection not shown. Whenever voltage is placed across the armature 209, the coil 206 i is energized and the circuit onarv contacts of the coune iforce relay 205 is broken shutting o'lf any circuit cs 20'? and 203 and preventoi the door operating The car is moved to the floor mechanis a. at which it is desired to stop and the conwhich is connected through atroller 255 is manipulated to bring the car to rest, current being thus shut off from the armature 209. The counter electro-motive i orce relay 205 will, however, be held up as long as the armature 209 turns even if the armature 209 is disconnected from the source or power the counter elect-ro-motive force of the armature being sufiicient to hold the relay 205 open until the armature 209 practically comes to rest, the stationary contacts of the relay 205 then being bridged. The stationary contacts of the relay 205 bethus closed it is possible to get power through the control system of the door operating mechanism.

The operator then moves the controller 500 from the closed position wm to the open position g g/, making a connection between the contacts 231 and 232. This completes a circuit through the wire 200 and the wire 234 to the contact 233, through the movable contacts and 262 to the contact 231 and through the wire 230 to the coil of the opening relay 215. The other terminal of this relay is connected to the floor registering switch 150 and through the opening limit switch 122 to the wire 208 which is connected through the counter electro-motive force relay 205 to the wire 201 which is theother side of the circuit. The counter electro-motive force relay 205 being closed, the opening relay 215 operates. providing the floor registering switch 150 and the opening limit 122 are closed which will be the case if the mechanism is in its proper position. The opening relay. it these conditions exist, will therefore lift, closing the circuit between the contacts 213 and 221. This completes a circuit through the wire 201. the field 53, the brake coil 50 and the contact 213, through the moving contact 225 and the contact 221 and through the wire 220 to the armature- 54, from thence through the wire 21'? to the contact 219, across the movable contact 226 of the closing relay 216 which is down to the wire 200 thus closing the circuit through the armature 54, the series field 53 and the brake coil 50. This operates the magnetic brake 44 pulling the shoes 46 out of contact with the wheel 45 and allowing the motor 43 to drive the worm 42 in a certain direction. This direction is such that the worm gear 60 is driven in a clock-wise direction as viewed in Fig. 5, the parts at this switch 123 from its closed position as shown in the diagram into its dotted position, thus closing the circuit to the threshold light.

These switches remain in this position until i the cam plate 91 has practically Completed its movement at which time the opening limit switch 122 is open. This opening of the openinglimit switch 122 opens the circuit to the operating coil of the opening limit relay 215 thus opening the circuit through the armature 54L and the brake coil 50 which stops the motor and applies the magnetic brake 44. This occurs whenever the cam "plate 91 has moved through approximately 170 degrees. During the movement of the cam plate 91 through this 170 degrees the crank pin 66 is also moved from itsposition shownin'F 5 to aposition 170 degrees in *a clockwise direction from this position.

In the position shown in Fig. 5 the crank pin block 70 holds the fingers 74; and 75 apart against the tension of the springs '81 and 83, This holds the driving strips 7'8 and 7 9 apart so that in their movement up and down the shaft a considerable clear- This "obviates danger of the projection 36 striking'upon and catching the driving strips 78 and'79 as the car passes up and down.

The driving strips 78 and 79 are formed of spring material having sufilcient elasticity v explained, that'thespring 83 is something over twice the 'st rength of the spring 81, therefore the spring 83 pulls the finger 7 1 to'beconsiderably bent due to displacement pt the members 36 and 37 without injury to the strips. They are also so formed andsecured that in the event that they are struck byajny object projecting into the hatchway that they can be torn away without injury to any'of the mechanism and can be replaced at small cost.

In its initial movement, as for example fromthe position shown in Fig. 5 to the'po- *sition shown in Fig. 3, the crank pin block 70 moves downwardly in the cross-head 71 without material movement otthecross-head 71' from-left to right across the frame 40. 507" In this initial movement the fingers 74 and 7 75 slide downwardly on the beveled surface 69'al'lowing the lingers 74 and 7 5 to close inwardly under the action of the springs 81 and 83. This throws the driving strips 78 and 79' inwardly against the projections 36 and 37 if the car is properly registered with the floor which requires the closingfof the fingers 78 and 79 on the parallel surfaces of the members 36and 37. In the event that the car is not in the proper position the finger 75 Wlll over travel,'th1s over travelresulting in the lug 131 lifting the rod 132 sufiicientlv :tO operate the floor registering switch 15 0 "through the rod 139. The opening ot the floor registering switch 150 opens the circuit .to the opening relay '215 and interrupts the armature circuitand stops the motor as has already been explained.

The further movement of the crank 'pin '66 throws the crank pin block 7O entirely out of engagement 'with the fingers 74 and 75 and starts the cross-head 71 to moving from right'to left, as viewed in Figs. 3 and 5, in the fra'me 40. It should be understood that these figures are in the position as viewed through the open door of the elevator, whereas 'the'do or a'ctuatingfand locking'mechanism illustrated in Figs. 11 to 16 inclusive-is in the position as viewed from the elevator car, and movement from right to left therefore of the driving strips 7 8 and 79 results in-a movement from left to right of the door actuating mechanism. Thismovementfirst unlocks the door as has already been explained and then moves the door across the opening'until it is open at which time theparts "are in the position shownindotted lines in Fig.3 and'the limits :oper ateas hasbeen previously explained to stop the mechanism.

It will be noted that during the time that "the ntro11e ;500 is in the open position, or with the 'stationary contacts on the line fy yjt hat the-contacts250'and 251 are open, 'thus penmgtlie control circuit of the main motor of the elevation through the wires 252 and 254, "thus preventing any movement of the armature2O7. It will also be noted'that the 'interlock"123 alsoopens this circuit.

It will be noted, as 'haspreviously been clamped --uponthe'members 36 and37 preventingany lost motion therebetween, the spring 81being'in function in opening and the spring 83' being'in function in closing.

. The door being open and the elevator being at reston the fioorfandthe controller 50 O being in the position g gz the'door is closed'bymoving this controller to the'line :g 'w'or to its closing position. This closes "the circuit between-the contacts 232 and 233 closing a circuit from the wire 200 to the coil on theclosing relay 216, this circuit being completed through the door j amb switch 151, the closinglimit121, the wire; 208, the

counter electro-motive force relay 205 and the wire207 to the wire201. In theevent that the closing limit 121 is'not closed or the door jambswitch 151 isnot closed this between the contacts 218 and'214'thusclosof course cannotfoccurr The actuation of the closingrelav 216 completes the circuit the brake coil 50, to the armature 54, through the wire 217, from the armature 5 1, through the wire 220 to the contact 222 of the opening' relay 215 across the bridging contact 225 thereof to the contact 223 and to the wire 200, thus closing the circuit through the armature 5% in a reverse direction to that previously described, causing the motor 43, through the worm 12 and the worm gear 60, to rotate the cam plate 91 and the crank pin 66 in a counter clock-wise direction as viewed in Figs. 3 and 5. This movement of the cam plate 91 actuates the limit switches 121, 122 and 123 as follows:

At the start of this counter clock-wise motion the closing limit switch 121 is closed, having been previously closed at the start of the opening movement, .The opening limit 122 is open, this opening limit 122 be ing closed at the start of .the closing motion. The interlock switch 123 is open making contact to the threshold light. This interlock is not closed until the cam plate 91 practically completes its movement at which time the opening of the closing limit 121 shuts off current to the motor. In the re verse motion of the crank pin 66 the crosshead 71 is moved from left to right as viewed in Figs. 3 and 5 across the main frame 10, closing the door through the medium of the spring 83. The tension of the spring 83 is suihcient for any normal operation of the door.

In the event, however, that the door jams due in most cases to strikin on some object in the doorway, possibly a person who has attempted to enter the elevator after the closing motion starts, the spring 83 is subjected to abnormal tension which pulls the projection on the finger 74 away from the side of the cross-head 71 and moves the lug 131 downwardly sufficiently to act upon the lower bar 35 and open the doorjamb switch 151. This opening of the door jamb switch 151 opens the circuit of the coil of the closing relay 216 and opens the circuit to the armature 541 through the brake coil 50 thus shutting down the motor. If the obstruction is removed so that the tension of the spring 83 is released the door jamb switch 151 closes and reestablishes the circuit and the door continues to close. This closing 1 motion of the door continues until the cam The method of operation of a hydraulic elevator having the diagram of connections illustrated in Fig. 8 will now be described.

It should be understood that these elevators are standard apparatus and that the water valve operating switch 305 is found on all elevators of this type as well as the operating lever located by the coil 393 as has previously been explained. Under normal conditions the floor registering switch 371 is closed and the coil 373 is energized due to the fact that there is a circuit through the wire 300 and through the wire 365 to the contact 366, from thence through the bridging member of the relay 353 to the contact 372, through the coil 373 and the wire 331 to the wire 304:, the wire 30 1 being connected to the wire 301 forming the other terminal of the circuit. In other words, the relay 353 is always in its upper position, closing the circuit between the contacts 366 and 372 and between the contacts 352 and 363 except under abnormal conditions which will hereinafter be explained.

With the relay in this position and with the car in any position, the car is started by operating the water control switch (not shown) which opens the switch 305 and disconnects the control mechanism for the door operating device. This mechanism remains disconnected until the elevator is stopped by closing the water control valve which closes the switch 305. The operator can then move the door controller 340 from the closed position 50-50 to the open position yy,' and in so doing establishes connections between the contacts 341 and 3 13. A circuit is thus established through the wire 300 to the wire 365, to the contact 3 13 through the segments 380 of the contact 3 11, to the coil 351 of the opening relay 315, and from thence to the contact 352 across the bridging member of the relay 353 to the contact 362, through the wire 361 to the opening relay switch 360, and from thence to the wire 301, thus completing the circuit.

The relay 315 being lifted due to its coil being energized, closes the circuit composed of the wire 300, the contact 331, the bridging member of the closing relay 316, the contact 322, the armature 541, the contact 318 of the opening relay 315, the bridging member of that relay, the contact 313, the brake coil 50, the series field 53 and the wire 304. This opens the brake on the door operating mechanism and energizes the armature 5 1, causing the door to be opened.

During the time the door is opened the closing limit 358 is closed and the opening limit 360 is open as has previously been explained. The opening limit switch 360 in opening breaks the circuit to the coil 351 allowing the relay 315 to open and thus interrupting the operation as has previously been explained. The door can then be closed by a similar actuation of the relay 3l6'ivhich need not be explained, the operation being similar to that already explained "in the case of the electrically operated elevator.

In the event that the elevator door is left open With the controller 3&0 in the position g 2 there is a possibility in a hydraulic elevator that the elevator will settle due to the Water leakage in the hydraulically operated mechanism thereof. As soon as the elevator settles sutliciently to disturb the proper contact between the projection 86 of the closing driving strip 78, the floor registermg relay 374 is operated as has previously been explained. The opening of this relay opens the circuit to the coil 873 of the interlock relay 358 thus opening the circuit to the opening relay coil 351 and closing the circuit to the coil 354: of the closing relay 316 through the contacts 368 and 370. The closing relay is theret'ore pulled upwardly even with the controller in the open position yy,

thus starting the armature 54c and closing.

the door, the closing movement being stopped by the limit 858 in the usual manner.

It will be noted that the projections 36 and are of unequal length, the object of this be ing to allow the closing projection 37 to close the door even after the driving strip 78 has broken connection With the projec- 7 opens and closes the'elevator door.

2. An elevator door ooeratin mechanism 0 I e b l 0 comprising a irame, amotor, a main shart turnln 1n bGtIHII S in'said frame means e y l connecting said motor to said shatt, crank on said shaft, a cross-head sliding in said frame, a crank pin block carried on said crank and slldmg in said cross-head at right angles to the line of motion of said crosshead, strips for driving said door carried by said cross-head, and means by which the.

movement of said crank pin block opens and closes said strips With relation to each other.

3. An elevator door operating mechanism comprising a frame, a motor, a main shaft turning in bearings in said frame, means connecting said motor to said shaft, a crank on said shaft, a cross-head sliding in said frame, a'crank pin block carried on said crank and sliding in said cross-head at right 'angles to the line of motion otsaid crosshead, fingers pivoted in said cross-head and V and elastic material and so secured end oi": the travel of said crank, and

resting on said crank pin block in such a manner as to be actuated thereby, and two driving strips each carried by one or said fingers.

4. In combination, mechanism for closing the door, a spring through which said mechanism closes said door, and means for stopping said mezhanism Whenever the pressure on said spri g exceeds a predetermined value.

5. In combination, a building struc doors sliding in said structure, an car moving in a vertical hatchvvay past said doors, a separate means carried insaid structure tor opening each or" said doors, a projection carried by each of said means, iTWO driving strips carried on said car for said projection, said strips being normally separated to allow clearance with said projection, mechanism for forcing said strips together to grip said projection, and means for stopping said mechanism it said strips tail to touch said proiecan elevator door,

tion at the proper point. a

6. In a door opening derice adapteo to grip and move projection operating an elevator door, two strips so placed as to pass oncither side or said projection when the elevator car registers with a floor, and for actuating said strips to move the said strips being formed of relatively and elastic material. l

7. In a door opening device adapted to grip and movea projection oneratino .1. L3 elevator door, two strips so place i as to pas on e'tl side of said proje tion when t elevator car registers With a floor, and means for actuating saic strips tomove the door, said strips being formed of relatively thin that they to the can be torn away without injury mainder otthe device.

8. In a door 0 toner, avtran'ie, walls tornr ing a slide in the hottom ot frame, cross-head moving in said slide, members projecting from'said cross-head at some distance above said slide, said members also projecting throi 1' a slot in said frame, and Walls inclosing said slide below saic. slot to retain oil about said slide.

9. an elevator, a door operatinr nism, actuating means for causi 5 said mechanism to function and a counter electro-motive force relay connected across an armature actuated by the motion of the elevator for rendering said mechanism. inoperative at all times While said elevator is in motion. 7

10. In an elevator door operating mechanism, a motor, a crank, means by which said crank operates he elevator door, limit switches for stopping saic motor vither an in terrupted gear through which said motor drives said crank said gear being of such 1 mecna proportions that it moves out of mesh if said when said controller is in the neutral polirnit switches fail to function. sition.

11. In an elevator, a car controller 10- In testimony whereof, we have hereunto 10 cated in the car and manipulated by the operset our hands at Los Angeles, California, this 5 ator, a door controller located in the car and 17th day of May, 1919.

manipulated by the operator, and means for LUTHER E. GROAT. rendering the door controller operative only FREDERICK F. BRUSH.

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