US868449A - Door mechanism for elevator-shafts. - Google Patents

Description

PATENTED OCT. 15, 1-907. 0. W. KIRSGH. DOOR MECHANISM FOR ELEVATOR SHAFTS.

APPLICATION FILED MAR. 16, 1905.

6 SEEET SSHBET 1.

No. 868,449. PATENTED OCT. 15, 1907.

0. W. KIRSOH.

DOOR MECHANISM FOR ELEVATOR SHAPTS, APPLICATION FILED MAR.15, 1905.

s SHEETSSHEET 2.

No. 868,449. PATENTED OUT. 15, 1907.

G. W. KIRSUH.

DOOR MECHANISM FOR ELEVATOR S HAPTS. APPLICATION FILED MAB.16, 1905.

6 SHEETS-SHEET 3.

J 5 323766665; E Jfvuew 071' PATENTED OCT. 15, 1907. C. W. KIRSGH. DOOR MECHANISM FOR ELEVATOR SHAPTS.

. APPLICATION FILED MAE.15, 1905.

s SHEETS-SHEET 4. F"

' 0. W. 'KIRSOH. 7 DOOR MECHANISM FORBLEVATOR SHAPTS.

PATENTEDA'OGT. 15,190

APPLICATION FILED MAE 15,

6 SHEETS-SHEET 5.

c. w. KIRS'GH. DOOR MECHANISM FOR ELEVATOR SHAFTS.

A PPLIOATION FILED MAR.15, 1905.

' PATENT'ED-QCT; 15, 1967 a SHEETS-SHEET e.

.UNITED STATES P TENT FFICE;

' CHARLES W. Kisses, or )IlICAGO, ILLINOIS, ASSIGNOR TO EL VATO SUPPLY a; REPAIR COMPANY, A CORPORATION O ILLINOIS.

noon MECHANISM son ELEVATOR-SHARES.

To all whom it may concern:

Be it known that I, (hIARLEs W. Klnscn, a citizen of the United States, and a resident of Chi :ago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Door Mechanism for Elevator-Shafts, &c., of which I do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

The present; invention, wl1ile susceptible of use in operating doors intended for other purposes, is more especially designed for the operation of the doors to elevator shafts.

The invention is (lirected more particularly to the operation of that class of elevator doors arranged -to slide in vertical direction, a pair of doors being provided for each opening of the shaft. i i

The primary object of the invention is to provide improved mechanism whereby the operation of the doors may be effected by fluid under pressure (cornpressed air preferably) deliyereddrom a common source of supplyto the operating mechanism adjacent each door opening of the shaft. v

The invention consists in the fcatures of novelty hereinafter described, illustrated in the accompanying drawings and particularly pointed out in the claims at the end of this specification.

Figure a view from the inside of an elevator shaft (lookingoutwardly), showing my invention as applied to the operation of a pair of vertically sliding doors, the doors being in open position. Fig. 2 is a view similar to Fig. l but showing the doors in closed position. Fig. 3 is an enlarged detail view in horizontal section on line 23-43 of Fig. 2 showing the bracket for guiding the upper end of the rod of the door cushioning mechanism. Fig. 4 is a view in elevation, with parts broken away showing upon an enlarged scale the automatic locking and unlocking mechanism, the doors and the parts adjacent thereto. Fig. 5 is a view in horizontal section on line 5- 5 of Fig. 4. Fig. 6 is a'view showing in vertical section a portion of the tloor'of the elevator ear and showing in elevation the parts connected thereto for automatically controlling the door-opcntting mechanism. Fig. 7 is a. view in vertical section on-]inc 7-7 of Fig. (5. Fig. 8 is a view in cross-section on line 8--8 of Figs. ttand 7. Fig. 9 is a view in elevation of one of the power cylinders and one of the cushion cylinders connected therewith. Fig. l0 is a view in central vertical section through the other cylinder and its cushion cylinder, adjacent parts being shown in elevation. Fig. ll is a plan view of the valve rn'echanism for controlling the motive fluid supplied to the power cylinders. view in section on line 12--l2 of Fig. 1]. Fig. 13 is a cross-section on line 1.3-lttof Fig. 11. Fig. 14 is a Specification of Letters Patent. Application filed March 15,1905. Serial No 25(l,234.

Fig. 12 is a' Patented Oct. 16, 1907.

view in side elevation of the valve casing. Fig. 15 is a view in section'on line 15l5 of Fig. 11. i

A and A designate metal plates or bars at the sides of one of the openings of an elevator shaft. Along the face of each of thebars A and A extends a channel-liar B (see Fig. 5) the inwardly extending walls b and b of which are held at a slight distance from the bar or plate A by means of the strip 13 that is bolted to the plate A i and channel-bar l3. Charmel-bars B form stationary guides for the upper and lower doors 0 and G of the ole vator hatch-way. The doors and (3 as shown, are formed of corrugated metal plates inclosed by an anglebar frame c. The .door 0 has connected to each of its ends a movable guide-bar D. A portion d of each guidebar D projects within the space between the inner edge of guide channel-bar 'B and the door plate The movable guide-bars D of the upper door C depend to a considerable distance below the lower edge of the door (3 and hence serve to guide the door throughout the. entire extent of its movement (see Fig. 1). The'movable guide-bars D for the lower door 0 are shown as connected by means of the brackets 2 and 3 that project laterally from the frame of the door 0. These brackets ,are riveted to the door 0 at their inner ends and have their outer projecting ends riveted to the guide-bars D. Each of the guide-bars I) has one of its angular portions 1! extending within the space between the outer edge of the tixcd channel-bar l3 and the door plate A, as clearly shown in Fig. 5 or the drawings. The movable guidebars I) extend to a considerable distance above the top line ol' the lower door 0 and hence serve to guide the lower door throughout the full extent of itsweltical movement.

The upper and lower doors (3 and U are connected for lmlanced shift in opposite directions by chains or cables i in any convenient manner. As shown, one end of each cable 1) is connected to the upper door by means of a book 5 riveted to the inner face of an abutment or bracket (5 that is secured as at 7 to the inner face of the u per door t. This bracket (S is braced by an arm 8 that extends upwardly.from the outer portion of the braclu t to a higher point on the frame of the door C.

- 'lhe opposite end of the chain or cable E i (medal to the frame of the lower door (f by'means of a hook 9 lll'tljttlillg upward from a plate it) that is riveted to the frame c ufthc door (see Fig. 4). Hence, it will be seen that when the upper door is raised, the lower door t" may descend by gravity by being controlled in its downward movenn-nt by the chains or cables E. The chains or cables I) at the ends of the doors and 0, pass over suitable pulleys l2 projectinginwardly from the door plates A and A.

Upon the plates A and A at each side of the hatchway opening, .are mounted the vertically arranged power cylinders F that are cross-connect'ed by a pipe f at their lower ends so that the compressed air or other fiuid under pressure; may pass ireely from one cylinder to the other. Within each otthe power cylindcrs F is a piston l from which extends upwardly the shil'ter rods l6. Connections between the shifter rods and the parts operated thereby are similar so that the description of the operating mechanism at one side of the door-way will answer for both. The upper end of the rod Hi has a reduced portion 17 that passes through a slot (5" that is formed in the brackets 6 (see Figs. 4 and 5). and the 'upper end l7" oi the part l7 which is iurthcr reduced, oi the shifter-rod 16 passes loosely through a liclc 20 in the lree end of a pivoted latch-bar 21. This latch-bar 2| is pivoted as at 22 upon a plate or bracket 23 secured to the frame of the door C and the angular hooked end 24 of the latch-bar 21 depends through openings 0' and 0 formed respectively in the Lupper and lower doors when Ll e doors are in closed position, and by its engagement with the frames of the upper and lower ddors, servrs to hold them securely in locked positicn. 'A shoulder 17 between the-reduced portions 17 and 17" and a nut 25- threaded on the portion 17" are arranged to engage with the -free end of the latch-bar 2i an d determine its move ment. v Figs. 2 and 4, the latch-bar 21 will hold thlm securely locked but when compressed air is admitted to the lower end of the cylinder F (in manncr to be presently defined) and the piston 15 and rod 16 are forced upward thereby, the initial movement of the shilter rod u; will douse the latch-bar 21 to rock abont'its pivot point 22 until the hooked end 24 of the latch-bar is swung from engagement with the angle frames of the loors..tl1erel)y permitting the further upward IDOVGIIiWllL I the rod ll; to ct the opening of the do rs in Iillhllllk r as will presently appear. g

As shown, the power cylinders F at the opposite sides of the door-way are provided with closed caps or ends' f having ports between which extends the connecting pipe f, and the cap f of one of the cylinders F is provided with an admission port f? that is connected by a short pipe with the casing K of the valve mechan.-'

ism whereby the passage of compressed air to and from the cylinders F is controlled.

By reference more particularly to sheet 6 of the drawings, the preferred construction of valve mechanism (which however may be varied widely without departure irom'the scope of the inventienlwill be readily understood. 1

Valve casing K is secured in position. by bolts 3]. and is provided with a cylindrical bore having herew-v threaded openings 32 and 33 with which the feed pipe 34 and cylinder pipe 30 engage, and, on the opposite side of the casing, a screw-threaded opening35 is provided withwhich the exhaust pipe 36 engages. Similar openings 32, 33 and 35 are arranged opposite the openings 32, 33 and35 so that the valve maybe arranged either on the right or left hand side of'the door, theopenings which are not used being closed by suitablev plugs '37. Between the openings 32 and 33 is arranged a diaphragm 38 which forms the seat of theinlet valve 7c, and through which extend the inlet ports 3'9. Exhaust ports 40 communicate with the opening 35 and these exhaust ports are preferably arranged .in the When the doors C and C are closed as shown in r The exhaust valve is is carried on a stem 41 which snugly fits within the open end oi the bore of the valve casing.

The inner end of the valve stem is provided with a per forated guide head 43 which fitsthe bore of the valve casing.- Exhaust valve is is provided as shown, with a suitable packing ring 44 of leather or other suitable yielding material, held in place by a washer 49 and lock nut 42.

The reciprocating inlet valve In is mounted upon a stem 45 which extends through a central'opening in the diaphragm 38 and the end of which extends within a socket 46 inthe inner end of the stem 41 of-the exhaust valve. The inlet valve casing is provided with a suitable packing ring 47 of leather or other suitable material, and the end of the bore of the valve casing is closed by screw-plug 48, which may be easily removedfwhen it is desired to renew the packing of the inlet valve. A reciprocating shifter L on the outer face of the valve casing is arranged to slide in suitable guideways formed in lugs 50, projecting laterally from the valve casing. One end of. the reciprocating shifter is bent laterally and is connected to the outer end of the exhaust valve stem 41. A stop 50 limits the throw of the shifter and of the exhaust valve.

In the normal position shown, the inlet'valve k is normally-closed and the exhaust valve is is normally open. In this position, thewalve stem 45 projects only part waywithin the socket 416 so that there is a lostmotion connection between the exhaust valve stem 41 and the inlet valve stem 45. By this arrangement,

= when the shifter L is moved to actuate the valve, the

initial movement thereof will close the exhaust valve before it opens the inlet valve so that there is no loss of the motor fluid. As soon as the exhaust ports 40 are closed, the play or lost-motion between the valve stems shifter L will open the inlet valve lc to admit air or'other suitable motor fluid under pressure to the motor cylin- 4 ders F through the pipe 30 and common connection f.

It will be noted that the exhaustwalve opens against the pressure within the motor cylinders and that the inlet valve. k opens against the pressure in the main food pipe so that as soon as the shifter L is released the valves will bc returned to normal position by the pres sure of the motor fluid to openthe exhaust ports 40 and close the inlet ports 39. This arrangement does away with the necessity of employing spring mechafiism for returning valves to normal position.-

The horizontal, reciprocating valve shil'tti' L'is arranged to be actuated by a suiiabletrip carried by the car, and for this purpose is provided with a \latcrally projecting stud 51 which carrics a roller 52 with which is in the form of a vertically disposed shoe connected by swinging links 53 with a vertically disposed strip'54, which is connected by lugs 55 withthe floor 56 of the car. Au actuating link 57 is pivoted intermediate its i 41 and 45 is taken up and the further n1: vement of the the trip M on the car engages. Trip M (seeFigs.'-6 and 8) ends to a lug 58 on the" bottom of the car floor; and: its I outer end is slotted to engage a pin 59 secured to the trip M, and a vertically reciprocating plunger 60,- arranged to shift through an opening the car floor, is provided on its upper end with a loot-piece 61 andat its lower end is pivoted to the operating link 57. A spring 62 coiled about the plunger normally holds it in its uppermost position with the trip M and link 57 in inoperative position indicated by dotted lines in Fig. 6. A latch 63 l M is shifted to operative position. shown in full lines in the drawings. By this means the trip-Mwill be locked in its operative position. The lower end of the latch is prevented from engaging the upper edge of the link 57 when the latter is in lowermost position by an upright -lug 57 secured to the inner face of the link. A pair of lugs 66 are secured to the plate A in the elevator shaft and are arranged respectively above and below the valve casing These lugs are arranged to engage the outer curved edge of the tail of the latch 63 to shift it against the tension of its spring so that the trip M may be returned to normal, idle position by the coiled.

spring 62. Lug 57" normally holds latch 63 so that it will not engage lugs 66.

To the upper end of each of the power cylinders F is connected a cushioning cylinder N, secured thereto by straps 67. The ends of each cushioning cylinder are closed and provided'with restricted ports 68, the lower A one of which is controlled by a screw valve 69 by which the port may be opened or closed to any desired extent. The iston 72. 'within the cylinder, ifprovided with a d 7*.) which extends upwardly through a suitigdrox 71 upon the upper edge of the cylinder. This-pist n-rod extends through the slot 6 of the abutment 6 and its upper end is guided in a loop 72 formed on the end of a bent strap 73, which is bolted to the side plates 2. shown in Figs. 2 and 3. A pair of stops 74 are secured to each of the piston-rods by set and are arranged in such position that they will be engaged by the abutment 6 when the doors are near the ends of their movement, either in opening or closing. A

It will be noted that as shown most clearly in Fig. 4, a shoulder 17 is formed upon the upper end of the main portion of thc shifter rods 16 and at the lower ends of the reduced portions 17 thereof, which extend through. the slots of the abutment straps 6. In the normal position, and whcn the doors are closed, this shoulder is spaccd a short distance below the alnitmcnt strapsii so that a lost-moi ion connection is provided between the shiftcr rods and the abutmcnts 6 on the door G, and

thc shouldcr 17 will not engage the abutments to lift the door until after an initial shift thereof suflicient to rclcasc the latches 21.

The operation is as follows: In all of the drawings,

except Fig. l. the doors are shown in closed position and the other parts in their normal, idle position. As

the car approaches the desired floor, the operator will depress the plunger 66 and thereby shift the trip M to operativeposition through the medium of the link 57. The trip will then be locked in its operative position by the latch 6i, and r. ill engage the roller 52 on the shifter l/aud operate the conlrolling valves is and k as described, to first close the exhaust from the power V cylinders F and then open theinlet ports loading thereto. Air or other suit'able motor fluid will then flow. frrpn the iced pipe 34 -to the valve casing K, through the .loi ports 9-9 and pipe 30 to oneof the motor cylinders F and through the connecting pipe f to the 7 they are brought together without Shock.

other motor cylinder, so that the pistons 15 will be actuated to lift the shifter rods 16. the rods 16 will move latches 21 abouttheir pivots 22 to release the doors and the continued upward movement of the rods will bring the shoulders 17 thereon into engagement with abutments 6 so as to lift the upper l door C and permit the lower door Oto descend by gravity. As the doors approach the end of their openingmovement the abutment or brackets 6 on the upper door C will engage the upper pair of stops on the piston rods 70, so that the pistons 71. within the cushioning cylinders N will be shifted upwardly, andthe slow escape of the air from the upper end of the cushioning cylinders will arrest the movement of the doors without shock. Inasmuch as the trip M is locked in its operative position, it will hold the valve shifter and valves in their shifted position and the'fiuid pressure within the motor cylinders will hold the doors open as long as the car remains at the floor. As soon however'as the car moves in either direction from the floor, the trip M will be disengaged from the valve shifter and a release The initial shift of i of the latter will permit the closing of the inlet valve is and the opening of the exhaust valve 7: under influence ofthe pressure in the motor cylinders and in the feed pipe, as before described. The upper door and its connected parts, are then free to descend by gravity.

The doors are so connected by the chains or cables E that they nearly balance each other and can be shifted with the expenditure of but little energy, but

the upper door and its connected parts are necessarily somewhat heavier than the lower doorso that it will descend by gravity when -the pressure in the motor cylinders 1* is released and lift the low or door through the flexible connections E. As the doors approach their closed position, the abutment s1 raps 6 will engage the lowermost stops on the piston rods 70 and thus shift the pistons n within the cushioning cylinders N down wardly. The slow escape of air from the low or end of the cushioning cylinders through the restricted ports 68, will check the closing movement of the doors so that I During the downward shift of the upper door the abutment 6 thereon will rest on the shoulder 17* of the shifter rods 16 stud-the shoulders 17" will hold the latches 2] in such position that their low or ends ill enter the 017611- ings c 0'' in the edges of the doors. As soon as the doors meet, the shifter'rods will continue. to descend until nuts 26 threaded on the portions 17 strike the brackets (landthe shoulders 17 w ill move away from the brackets 6. Latches 2] Vi ill be swung about their pivots by nuts 25 back to normal position and n ill lock the doors together so that they cannot again open at any floor until the car is at such floor. In this n ay any accidental opening of the doors is prevented by the safety latches 21;

Thelugs 66 shown in.Figs. 7 and 8, are arranged hetw eon the floors so that when a car moves from any floor. either up or down, latch 63 w ill be shifted by one of jhe lugs 66 to release the trip M and permits its'reof warehouses and the like. Such doors are necessarily of heavy construction, and even when double vertically sliding doors connected for balance shift are employed, they cannot be readily operated by hand. Fire doors of this type now employed, are frequently left open so power cylinders havinga common control mechanism provide means by which they maybe easily and quickly operated with certainty, and by which they are automatically closed and the cushioning appliances prevent any shock or jar to the door mechanism as they are opened and closed. The automatically controlled locking device insures that the doors will be held snugly together in closed position to afford the desired lire protection. It is understood however, that the mechanism is not limited to the operation of: fire doors, that numerous changes may be made in the details of construction without departure from the essentials of the invention and that parts may be taken without its adoption as a whole.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is: I

1. The combination of the vertically sliding, upper and lower doors, guides above the ends of said doors, flexible comiections'betwcen said doors extending over said guides. a lock for holding said doors in closed position, 11 motor, means operated by said motor for releasing said lock and shifting said doors, and control means for said motor gov erned by the travel of the elevator car.

-2. The combination of the vertically sliding, upper and lower doors, guide pulleys above said doors, ilexible connections between the ends of said doors extending over said guide pulleys, means for locking said doors in closed position, and a shifter connected to one of said doors arranged to release said lockingmeans.

ii. The combination of the vertical sliding, upper and lower doors, a stationary guide on each side of said doors,

.and a pair of milde burs engaging the opposite edges of each of so! .Tiliiles, conncclcd respectively to said upper and lowc. doors.

4. The combination of the vertical sliding, upper and lower doors, a siationnry g'uide on each side of said doors, a pair of guide bu i's engaging the opposite edges of each of said stationary guides connected respectively to said upper and lower doors, flexible connections between the ends of said doors, guide rollers above said doors over which said connections extend, and a shifter connected to one of said doors, substantially as described.

5. The combination oi the stationary guides. pairs of sliding guide-bars engaging respectively the inner and outer edges of said stationary guides, the upper and lower doors connected respectively to the upper and to the lower ends of said guide burs, connections between said .doors and operaiinr, shift :ncclmnism'thcrcfor.

6. The combination of the vertically sliding, upper and lower doors, flexible connections between the ends of said doors, guides above said doors over which "said connections exicnd, shifters -conncctcd to the opposite ends of one of said doors, motors for operating said shifters and common control mechanism l'or suid motors.

7. The combination of ihe vertically sliding, upper and lower doors, flexible connections between the ends of said doors, guides above said doors over which said connections extend, u vertically reciprocating shifter-rod connected to onset said doors, a vertically disposed cylinder, and pis ton therein for operating said shil'tcr-rod, and a control-,

lable valve governing the admission lo, and exhaust from,

' said cylinder.

8. The combination of the pair of vertically sliding and released by iii seam doors connected for balanced shift in opposite directions, a pairof vertically reciprocating shifter riods connected to the ends of one of said doors, vertically disposed motor cylinders for actuating said shifter-rods and control mechanism thcrel'or governed by the travel of the elevator car.

.l. The combination of the pair of vertically sliding doors connected for balanced shift in opposite directions, vertically reciprocating shifter-rods connected directly to the ends of onc'of said doors, pistons on said rods. cylinders for said pistons and controllable valve mechanism governing ihc. admission to, and exhaust from said cylintiers.

. 10. 'lhe combination of a vertically sliding elevator door, a reciprocating shifter-rod mounted on the wall of the elevator shaft and for operating said door arranged to engage the some after a slight initial movement, a latch mounted on said door, released by the initial movement of vshid shifter-rod, and actuating means for said shifter rod controlled by the travel of the car.

i1. 'lhc combination with a vertically slidingelevutor door, of :1 reciprocating shifter-rod, :1 lug on said door with which said rod engages after a slight initial move ment, a latch pivoted on said door, engaged by said rod initial shift thereof, a piston on said rod, :1 cylinder for id piston and a controllable valve govcrning the admission to and exhaust from said cylinder.

12. The combination with a-pair of oppositely and vertically slidinr; doors, of locking means for said doors and shifter mechanism therefor mounted on the wall of the ele- .vator shalt and arranged by initial shift to release said locking means.

1;. The combination with :1 pair of vertically sliding doors connected for simultaneous shift in opposite direc i:ions, of a latch connecting said doors in closed position, and a shiftor mounted onthe wall of the elevator shaft, having a lost motion connection with one of said doors and :irrangcd by preliminary shift to release said latch,

14. The combination of a pair of vertically sliding doors connected to shift in opposite directions, a reciprocating sliiil'er-i'o l mounted on the wall of the elevator shaft and having a lost motion connection with one of said doors, and a latch on the latter door arranged to engage the other in closed position and released by initial shift of said rod.

15. The combination with a pair of vertically sliding doors .counecled for simultaneous shift in opposite directions, of a latch connecting said doors in closed posiiion, shii'ter mechanism mounied on the wall of'the elevator shaft and having a lost motion connection with one of said doors, and means on thccar for controlling the oper- :Iiioll oi rid shii'icr mechanism, said shifter mechanism being arranged by preliminary shift to release said latch, substantially as described.

1G. The combination of the pair of vertical sliding elevator doors connected for balanced shift in opposite dircc tions, on ubuimcnt on one of said doors and a latch lhcrcon arranged to engage the othcr door in closed position, a vertically reciprocating shifterrod having a lost motion connociiou \vlth'suid abuimcnt and arranged to release said latch by initial movement, and means for :ictuaiinp,- said shifter-rod.

17. The combination of the pair of vertical sliding elevutor doors conucclcd for luihrnccd shift in opposite dircciions, ubulmcnts on the ends of one of said doors, latches pivoicd ihcrcon arrungcd' to engage the other of said doors in closed position, vertically reciprocating shificm-ods having lost motion conncction with ubuimcnts and arranged to rclcnsc said latches by initial shift, pistons on said rods. cylinders for said pistons and valve mechanism couirolling thc admission to and exhaust from said cylinders.

i8. "lhc combination with an elevator door and openul'inp, mcn s tlrcrci'or, of a controlling trip carried by the car. m'cuus for soiling said trip in operative position and menus mouuicd on the wall of the elevator shaft for returning tho trip to normal position,

ill. The combination with an elevator door and its ()pil'ilililg means, of u shiftabie controlling trip carried by the car, a latch for locking said trip in operative position and lugs upon the wall of the elevator shaft for saidloo ' releasing said latch to restore said tripto normal position.

, 20. The combination with an elevator door, of a shifter therefor, a motor for operating said shifter, fcontrolling mechanism for said motor, a .shiftable trip carried by the car to actuate said controlling mechanism, means for settings-aid trip in operative position and means on the wall of the elevator shaft for returning said trip to normal position. 1

21.'The combination with an elevator door; of a reciprocating shifter therefor, a cylinder and piston for operating said motor, valve mechanism controlling the admission to and exhaust from said cylinder, a trip for said valve mechanism carried by the car, a latch for holding said trip in operative position and lugs in theelevator shaft for releasing said trip.

' 22. The combination with an elevator door and its operat lng' mechanism, of a spring-held trip for controlling said mechanism carried by the car, a spring-held latch for holding-said trip in operative position and lugs in the elevator shaft arranged to engage and release said trip.

23. The combination with an elevator door, a shifter therefor, ,ai1d a cylinder and piston for operating said shifter, of a valve casing communicating with said cylin'der having normally open admission and normally closed exhanst ports, valves controlling said ports and a trip Witnesses carried by the car for successively shifting said valves, to first close said exhaust port and subsequently open said inlet port.

24. The combination with an elevator door, a shifter therefor, and a' cylinder and piston for operating said shifter; of a valve casing communicating with said cylinder having normally open admisslon'and normally closed exhaust ports, reciprocating exhaustand inlet valves held in normal position by the fluid pressure, a shifter for successively actuating said valves and a trip carried, by the car for actuatingsaid shifter;

251The combination with an elevatordoor, a shifter therefor, and a cylinder and pistolr for operating, saidshifter, of a valve casing communicating with said cylinder having admission and exhaust ports, normally closed reciprocating admission valve, a normally open reciprocating exhaust valve having a lost motion connection with said inlet valve and arranged to close said exhaust port by initial movement, a shifter connected to said exhaust valve and a'trip carried by the car for operating said shifter.

' CHARLES W. KIRSCH.

vGino. P. FISHER, Jr.,'

EDWARD WYLDE.

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