US1373122A - Safety device for elevators - Google Patents

Description

D. EVANGELIST. SAFETY DEVICE FOR ELEVATORS.

APPLICATION man APR.24, I920.

Patented Mar. 29, 1921.

2 swans-4mm l. 7/ 93 31441944 tom 33:1 nus Clitozwmg D. EVANGELIST.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED APR-24, 1920.

1,373,122. Patnted Mar. 29,1921.

2 SHEETS-SHEEI 2- Fig. 3

' Swqamfoz :D 0 mmuafl, a \raxQEZhS C i W W ill llim li i lt ll ll l i was i r em ll..,o ill,

implication filer" To (ill to from at array concern lilo it known that l, Detention l venereisr, a subject of the l linp; of lotaly, and. a resident of ew Yorla, borough of ldroniz, in the county of llronx and bltate of llevv York, have invented certain new and useful lmprovements in Safety Devices for Elevators, which the following; is a full, clear, and exact specification This invention relates to a. class of devices designed to be .sed in conjunction with elevators lily invention. has for its object primarily provide a device adapted to be utilised for preventing; injury to persons when oocugyiug the elevator car of a luiildinp, or other structure by causing the car to stop during; itstravel in event of breaking of the hoisting cable, and which also serves to allow the ear to be lowered to an exit so that the occupants may safely depirt therefrom should the car. stop between landings. The invention consists mainly of arranging a frame Within the shaft of an elevator car With which is associated a counterbalancing Weight and a motor, and in the frame are journaled tvo spaced shafts. The shafts are provided with a plurality of pairs of pulleys, one pulley; of each pair being held on each of the shafts. Also on. the shafts are held two alined friction brakes, Under the frame is mounted a pulley which is adapted to be moved upwardly and down wardly toward and from between the bralres, the the drive shaft of the motor is held a pulley, and in spaced proximity to this pulley is an idler pulley, A rable leads from the car over the movable pulley, over the idler pulley as Well as over the pulley on the motor shaft, and the second end of this cable is attached to the counterbalancing Weight of the car. Another cable leads from the car over each successive pair of the pulleys'on the shafts of the brakes in the manner somewhat of bolts, and the other end of the second cable is also fastened to the counterbalancing' Weight. Associated with the movable pulley is a "Weight element adapted to automatically move with. the breaking of the cable on the movable pulley so that this pulley Will be moved upwardly, and on the frame is provided spring); uctuated mechanism which is operable with the movements of the wei rht element and the movable pulley for causing; the travel of the car to stop by operating;

Specification 01 Letters Patent.

- any suitable material in the friction brakes itatented llltar, lltlti'lti April flit, Ittlflll. lterial Lto. dlllfittid.

and checking the moveifucnt of the cable on the pairs of i'ulleys,

tnother object of the invention is to pro vide a releasing,- mechanism which is operable from the interior of the car for releasing; the braltes when set to permit the car to be lowered to an exit of the elevator shaft following; the stop of the car between land ings, in order that persons occupying the car may safely leave the car; and a further object'of the invention is to provide a safety device for elevators of a simple, ellloient and durable construction which may be made of any desired size.

il ith these and other objects in view the invention will be hereinafter more fully de scribed, with reference to the accompanying drawings fljln'llllg a part of this specilication in "which similar characters of reference indicate corresponding parts in all the views, and will then be pointed out in the claims at the end. of the description lln the. drawings, Figure 1. is a fragmentary view, partly in section, showing a front elevation of one form of safety device embodying: my invention as employed in con junction with an elevator car, its operating motor and its counterbalancing weight.

Fig. :2 is a fragmentary view, partly in section, showing a side elevation of the do vice with the car, motor and counterbalancing: Weight.

Fig. 3 is an enlarged plan view of parts of the device with the Weight actuating" mechanism for releasing the brakes removed tl'ierefroin, and

Fig. 4 is an enlarged fragmentary vievv, partly in section, showing a front elevation of the brakes and their operating mechanism when actuated for stopping the elevator car.

T he safety device has a frame 10 which may be composed of two side plates ll and 12 arranged in spaced parallel relation as Well. as being, secured crosswise upon a platform, as 13, which is placed in the upper part of an elevator shaft, as l t, having a car, as 15, for carrying persons and articles from the lower to the upper part and vice versa of a building or other structure, and associated with the car is the usual movable counter weight, as 16, for balancing the car, while on a platform, as 17, provided in the elevator shaft under the i'ilatform l3 may be a motor, as 1?, of preferably a riwcrsible type adapt ed to be driven by electricity supplied from any suitable source till 'end of a cable 47 whicl the shaft 14 through holes In the ends of the plates 11 and 12 of the frame 10 are journaled two crosswise shafts 19 and 20, and one of the ends of both shafts may protrude beyond the plate 11. On the shafts 19 and 20 between the plates of the frame are pairs of pulleys 21, 21 22, 22, 23, 23 one pulley of each pair being held on each shaft so that with the rotation of the pulleys the shafts will be revolved. On the protruding ends of the shafts 19 and 20 are two similar friction brakes 24 and 25 adapted to be operated for stopping the travel of the car 15 in emergency, as will be hereinafter more fully explained.

Each of the brakes 24 and 25 has a circular disk 26, and both disks are fixed to the shafts 19 and 20. On the periphery of each disk is a strap 27 which is preferably composed of a strip of flexible metal with a leather lining contacting with the edge of the disk. These straps are somewhat larger than the diameters of the disks S01 that the ends of the straps protrude slight distances from the edges of the disks as well as being in closely spaced relation, and the ends of the straps of the disks are attached to sleeves, as 28 and 29, which are rotatable upon studs 30 and 31 projecting from spaced parts of the plate 11 of the frame 10 so that with the rotary movement of the sleeves accordingly the straps 27 will be brought into and out of frictional engagement with the disks 24 and 25 for setting and releas- .ing)the brakes.

' epending from the underside of the platform 13 centrally between the brakes 24: and 25 is a bracket 32 having two spaced arms 33 and 34 which extend toward the motor 18, and in the arms of this bracket are registered vertically disposed slots 34, while through the platform 13 is an opening 35 leading into the space between the arms 33 and 34; of the bracket. In this bracket between its .arms is a pulley 36 having its shaft 37 rotatable as well as slidably arrangedin the slots 34 of the arms of the bracket, and to the shaft 37 of the pulley is held the lower end of a plunger or-bar 38 which is of a length so that its upper part movably protrudes through the opening 35 of the platform 13 as Well as protruding somewhat above the platform. on the drive shaft 39 of the motor 18 is a pulley 40, and on the underside of the platform 17 in spaced proximity to the motor are two spaced brackets, .1 and 42 in which is journaled a shaft 43 carrying two closely arranged pulleys 44,45 and a third'pulley 46.

To the top of the car 15 is attached one passes upwardly in in the platforms l7'and 13 over an idler pulley 48 held on a stud 49 which is journaled in the plates 11 and 12 of the frame 10 centrally between the brakes 24 and 25. From the pulley 48 the cable 17 passes in the fashion of belts successively over the pairs of pulleys 21, 21, 22, 22, 23, 23. The cable then passes over the pulley -16, and the second end of the cable is fastened to the counterbalancing weight 16. Also to the car 15 is held one end of a cable 50 which passes through an opening in the platform 17, over the movable pulley 36, over the pulley 44, over the pulley -10 of the motor 18, over the pulley 15, and the second end of the cable 50 is attached to the cmmterlmlancing weight l6. With the operation of the motor and driving of its pulley 40, for causing the car to travel upwardly in the shaft 14 the weight 16 will move downwardly in the shaft, and the movement of the cables 17 and 50, will rotate the idler pulley 45, pairs of pulleys 21, 21, 22, 22, 23, 23, pulley 16 and pulleys 44, 45. These parts of the device will be reversely operated when the motor is operatively reversed for lowering the car in the shaft. 7

Should the cable 50 accidentally break the pulley 36 and plunger 38 are moved upwardly by operation of a weight element, as 51. This element consists of a link 52 having one of its ends rotatably held on a'pin 53 protruding from the upper end of the plunger. To the other end of the link 52 is rotatably held, at 54:, one end of a bar 55, and on the other end of the bar is a weight 56 which may be in the form of a ball. The bar 55 intermediate its ends is,fulerumed, at 57, to the plate 11 of the frame 10 of the device, and the ball 56 is of sufficient weight to cause the bar 55 to be swung for moving the plunger 33 and pulley 36 upwardly toward the center of the space between the brakes 24 and 25 in event of breaking of the cable 50.

In order to set the brakes 24- and 25 for stopping the travel of the car as well as checking the movement of the cable 47, a mechanism, as 58, is provided. This mechanism consists of providing on the sleeves 28 and 29 of the straps 27 of the brakes two bars (31 and 62 which protrude upwardly. Between these ba rs and attached to their upper ends is a spring (53 which normally serves to force the bars toward each other, and this spring is also tensioned for serving to set the brakes 24 and 25 in emer ency by causing the straps 27 to frictional y engage the disks 26 when the bars 61 and 62 are swung toward each other by the action of tlle'spring. On the pin 53 of the plunger 38 is slidably and rotatably mounted in crosswise arrangement the slotted ends 64 and 65 of two levers or bars 66 and 67 one having its central part pivotally held on the fulcrum pin 57 of the weight element 51 and the other lever having its central part fulcrurned. at 68, to the plate 11 of the frame 10 of the device. The lovers ()6 and (37 are arranged so that their second ends are in till whetehy the pulley and plui'igei' ture in the hiuicltet till i closet fill ot and the poi two lu v sea id. i shun "tn l1 o Tl'tllll 1 the sleeves i 38 and, itltl- (it) end id, both oit whiel'i a ly t upon the second. ends ot the levers lid and. l l hen he safety devim eat 15, :uiotoi: ltt nd t (it lites ttll; in noi'nial wot 1' sonditiou the pulley filth plunger th we it element all end levels in pa itions. shown in 1t,

lowered ot the platform it. The weight element 5ft is ewut Y upwardly and the levees till end are d posed in somewhat the tashion e W with their tree ends supporting; the lugs tilt and it) so that the sleeves 28 and E29 ot the hi'zhes 2st and tlti are rotatably positioned on the studs 30 end Ill oi the items it] to hold the sttaps it? oi til ate the brakes out ot :ti'ictional enene'enient with The hats til end 5% ate thetehv even I; eh othen and t spline; paneled agpiinst tension. event J the noble the i r Zltl and pulley tlti ,tw Ll uuto opeiate, ee above dese o unt l i. e positiontn as sh "lid. in l The l le cs end will en'pa" iioly pguie'e tot" cousin th ends to he lowered. The on spring Gil will force the upper ends ot the bats (iii and 62 toward turn the sleeves and "2 9 of the bars will he partially llfiVUlVECl tot" settinp; the brakes .Zi; end by bringing the straps 9/? into triothe dislis ot the hniltes. till ot the mecha UUtWt l' tioi action with the disks 26 oi the to sites.

a releasing inechanisin as 71. The role: sine;

mechanism is preferably comp sed oi two alined hate 72v and i3 hav ng; one oi then."

ends pivoted, at 75 and 76, to the central sloth-uh as at so and 8t,

parts of the bars 61 end 62 of the spying actuating mechanism 58 ot the b 'elces so that the second ends of the hairs 72 and '73 are in slidable overlapping; arrangement cei'lti'all'y between the bars 61 and (32. The overlapping ports of the bars 72 and T3 are slotted respectively, at 7 7 and 78, and these slots are adapted to register. To the central pai't of the bar 72 is pivoted, at 79, the upper end oi a iinlr. 80, and to the cent ml part at the but" 78 is pivotethet til the upper end of a link 82" The links 86 and, "52 are d posed downwaedly from the slidable slotted hairs 7% mid 73 and the second ends of these here are as well as ovetlap pimp; each other so that the slots are in QJIOSFS' ii ht ole each other, and in P stein lTow blv eutendinpginto the Ed. slots U3 and it]: of the links $0 and 5:5. is a pin which protrudes ti'oni the lower end ot a but lib disposed upwardly to the spring ot' the mechanism 5d, and on the Otllltldl part of the but till is a pin ill niovi hlv disposed in the registered slots *2"? and Til ot the hats and iii. Extending up Watdl' -,z* t me the central part oi" the plate oi the s mp- 63, while its other end pro llttltltfltii some distance rearwei-dl v ot the spting, The central pint ot the trout poi"- tion oi the level" 90 is pivoted, at 91, to the uppei" end of the hat till, end on the trout cud oil the lever I" a weight 955 whioh may be in the town of a hall To the otheiend of the lever 90 t1 stoned the upper end of u ouhle lie I (lOWllttt'ttlljt? in the eleit sha'tt to one ot the walls ot the 1 end UT? the cable till i L, zit t l a bottom ot the ft t so that the cable will he held taut tlu tie inner taco of the wall of the ca udjueent to the cable 93 may he provided :1. plate 95, and projecting from; this plate through holes in the car contiguous to the cable 93 are two spaced pins 96 and 97 which are arranged lllVGltlCZLl alinelnent. Rotatehle on the pins 96 and 97 are two vertically ulined pulleys 98 end 99 which are in spaced relation as well. as being; arranged so that the cable is inov: l'llY disposed in their peripheral pytooves. Un the e ioi' oithe wall of the our end held to the plute are two spaced sttaps Mill and 101 disposed in tiainivetse alineiuent between the pulleys 98 and 99, and

ltd

wise of the cable and between the pulleys is it molt oitoothed bar 102. (he a stud protruding; from the melt toward the pulleys 98 and 99 is o i'evoluble pulley 103 adopted to he moved by the movement of the eel; into and out 0t engagement with the part of the cr'olc opposite to and between the'pulleys 98 v and 99 so that the cable will be clamped between the three pulleys as well as being released when the rock is moved accordingly. Projecting through of the car and join-nailed in the plate 95 is u stud 10-11:, and on the port of this stud within the cat is a hand wheel 105i whereby the stud may he manually revolved, and on the stud 'Bl'lOlflV oi the car is a, toothed wheel 106 ineshinp; with the rock 1( l2. d hel'i the spring uetuated inechanisinis held out of action at shove desciihed the hats 7? and T3 with an opening in the wall the links 80 and 82 of the releasing mechanism are in the expanded positions shown in Fig. 1, and when the mechanism 58 is operating to check the travel of the car the bars 72, 73 and links 80," 82 are in the contracted positions shown in Fig. 3. The releasing mechanism 71 is then coacting with the mechanism 58 to hold the car against movement, and to allow the car to be lowered to an exit of the elevator shaft the releasing mechanism 71 is operated by the operator of the car by turning the wheel 105 so that the toothed wheel 106 will move the rack 102 for causing a the pulley 103 to be moved in a direction between the pulleys 98 and 99. The cable 93 will then be clamped between the three pulleys.

The .pull on the cable which is brought about by the turning of the hand wheel 105,

causing the pulley 103 to move out from be-. tween the pulleys 98 and 99, thereby making abight in the cable 93, which action shortens the effective length of this cable. The lever 90 will then raise and release the brake mechanism, after which the car will be lowered by its own weight so that the occupants may depart from the ear.

In the foregoing description, I have emhpdied the preferred form of my invention, but I do not wish to be understood as limiting myself thereto, as I am aware that modifications may be made, therein without de- .?parting from the principle or sacrificing fany of'the advantages of this invention, therefore, I reserve to myself the right to make such changes as fairly fall within the sco e. v l -faving thus described my invention, I

claim as new and desire to Patent U 1. In a safety device for elevators, the

mcure by Letters combination with a car, a 'motor, and a weight counterbalancing the car, of a frame mounted above the motor, two spaced shafts journaled in the frame, pairs of pulleys, one

'pulley of each pair being on each of the shafts, two alined friction brakes on the shafts, a pulley on the drive shaft of the motor, a cable leading from the car over the pulley 'on the motor shaft and having its second end attached to the counterbalancing weight, a second cable leading from the car over each-successive pair of the pulleys of the shafts of the brakes in the fashion'of belts and the second end of said second named cable being also fastened to the counter-balancing weight, and spring actuated mechanism operable with the breaking of the cable on the pulley of the inotor for causing the travel of the car to stop by operating the friction brakes and checking the movement of thecable on the pairs of pulleys.

2. In a safety device for elevators, the

- pulley combination with a car, -a motor, and a weight counterbalancing the car, of a frame mounted above the motor, two spaced shafts journaled in the frame, pairs of pulleys, one of each pair being held on each of the shafts, two almed friction brakes on the shafts, apulley on the drive shaft of the motor, a cable leading from the car over the pulley on the motor shaft and having its second end attached to the counterbalancing weight, a second cable leading from the car over each successive pair of the pulleys of the shafts of the brakes in the fashion of belts and the second end of said second named cable being also fastened to the counterbalancing weight, spring actuated mechanism operable with the breaking of the cable on the pulley of the motor for causing the travel of the car to stop by operating the friction brakes and checking the movement of the cable on the pairs of pulleys, and a weight element associated with the cable on the motor pulley normally serving to hold actuated mechanism from operating and the weight element automatically movable with the breaking of the cable on the motor pulley so that the spring actuated mechanism may operate.

3.-In a safety device for elevators,.the combination with a car, a motor, and a weight counterbalancing the car, of a frame mounted above the motor, two spaced shafts journaled in the frame, pairs of pulleys, one pulley of each pair being held on each of the shafts, two alined friction brakes on the shafts, a pulley on the drive shaft of the motor, a cable leading ,from the car over the pulley on the motor shaft and having its second end attached to thevcounterbalancing weight, a second cable leading from the car over each successive pair of the pulleys of the shafts of the brakes in the fashion of belts and the second end of said second named cable being also fastened to the counterbalanci'ng weight, spring actuated mechanism operable with the breaking of the cable on thepulley ofthe motor for causing the travel of the car to stop by operating the friction brakes and checking the movement of the cable on the pairs of pulleys, and releasing mechanism coacting with the spring actuated mechanism for releasably holding the car and said releasing mechanismbe' i'ng operable from within the car to release at intervals the stop action of the spring actuated mechanism for freeing the brakes whereby the car may be lowered by its one pulley of each pair being held on each of lti the pulley of the motor 0 leading" from the car the ohatts two alined friction brakes on the eha'tte, a pulley on the Lllll/G shaft oi? the motor, a le lc: dingfrom the ill. over the pulley on the lllQllOl. shaft and having its; second end attached to the couiltei'balancin i Weight, a second c: ble leading; li'oin the car over each successive pair oi? the pulleye oi the shafts at the b 'ahee in the fashion of bolts; and the second end of said teamed cable being; also fastened to the counteicl al.- anciog "Weigzghh spring actuated mechanism operable with the breaking of: the cable on for causing; the travel of the car to stop by operating the friction brakes and checking the movement of? the cable on the pairs oi pulleye, a Weight element associated. with the cable on the motor pulley normally serving to hold ea id spring actuated mechanism from operating: and the Weight element being automatically movable with the brezlting" of the cable on the motel" pulley so that thi opting; actuated ichanism may operate, and releasing mech anism coactingg" with the spiking; actinitcd mechanism for i'eleaeably holding tho'cai' and said releasing; mechanism. being: open able from within the ill' to release at inter:- vals the stop act-ion oi? the spring actuated mechanism for freeing the brakes whereb the'cair may be lowered by its weight 5. la a safety device for elevators, combination with a car, match and a Weight co'unterbalanciiog the Call, oil friction brakes mounted illJOVS the motor, a cable to the counterbalancing; weight and the movement oi the cable being under the control of the action of the lJl'tllIliS, a second cable also leading from the cat to the counterbalancing weight and said second named cable being (hive-iii. by the inoton and spring actuated mechanism operabl with the bieahihp; oil the cable oil the me for coach the travel oil the cat to stop by epeieatiu the friction btaltee and checking}; the lnflflelllell't of the cable oi? the bl'ahco.

lb :1 eaitt v device for elevatoifa the v a can a .i'uotoi" and a "Well it L'Ulll'lllfl'JlllllllGlllQ; the car oi tifiction brakes mounted above the motor, a cable from the (5? l to the couuteirbalancleflit and the movement oi? the cable 7, lg under tie control oi the action oi? the bii'alieaq a second cable also leading from the cat to the countci'bwl it and said second nanied cable being di' by the motor, spline; ac All mechanism operable witli the breaking o= "h cable of the in ion causing the t .e ca 1 to stop operating; the lite the movement Oi; t and a Weight ele. iciated With the cable of the motor aoiro'm 37' serving to hold said spring actuated iinechaniem from ople oil the brakes,

crating and the wel it element beii'ig autoi'oatically movable with the biealt' oil the c: ble ot the motor so that the spring actuated inechan' may operate.

l. in a safety device lot elevators the combination with a can a incl 1 and a u'ei 'ht counteiflmlancing the f-tll (ll li'iction bit-altos mounted above the motor a cable leading from the car to the coi'mtei balancing "weight and the movement oil the cable being undei" the control. of the action oi? the liillllliebi a second :ablc aleo leading: from the cal to the countercbalauciug' Weight and said second named cable being; driven by the llltl'llOl, epi'ii actuated. mechanism operable with the breaking; oil the cable of the motor lei causing); the trowel oil the cal. to stop by spring: actuated inechanieni lot ltfllbithtlljljf holdin the cat and said releasing nice-ha hie-in being; opemble lii'oi'n Within the ill? to release at intervals tl r b-stop action ol the s nking;actuated mechaniein 'l'o Feeling the lit-altos "whereby the cal? may be lowered by its weight.

in a cat ty device lot ele'iai'tocs the combination with a (3211, a motor, and a VI'Olglllt coun'terbalaiming the can, oil friction llil'zt 'es mounted above the motel, a cable leading from the zai" to the coiniteisbalano lllt: u it and the movement of the cable being; under." the control oil the action ol the iii-altos, a second cable ai 0 leading): from the catto the coimtei'balaiic "Weight and said .eecond named cable beii'lc; driven by the motor, sprin actuated mechanism opeirable with the breaking of the cable of the motor for causing the travel of the cat to stop by operating the ltl'ctlou bi'altea and checking}; the mo 'eiiieiit oil we cable at the biahca a and the Wt ht 1 nioi able a .l the bi'eahi the motor that the epic aniani may operate and niche coactiep; With the spring :u'iechanisin l'o'i' ifcloasably holln the cat and said releasing mechanism being}: opetable from Within the L' to i'eleaee at intervale the atop action ot the g actuated mechanimu 'loi 'll'tltlll'lll the whereby? the cat may be lowered "it,

ll. lo. a ealbtja device lot el "'i'lllllltt'tltil't with a at. mott counteilailanci the can o'l ltictii'iu :nted above it 1e mot on a cable leading; li'oin the car to the counterbalano h1g1 weight and the movement of the cable being under the control of the action of the brakes a second cable aloe leading from the ol: the cible of ill actuated mechiioleasing R'Jllilr tu ate d Q? autoniatiCally. l

(ill

llti

car to the counter-balancing weight and said second named cable being driven by the motor, spring actuated mechanism operable with the breaking of the cable of the motor for causing the travel of the car to stop by operating the friction brakes and checking the movement of the cable of the brakes, and a lever with a weight coacting with the spring actuated mechanism for releasably holding the car, and means operable from within the car to release at intervals the action of the lever upon the spring actuated mechanism to allow the spring actuated mechanism to operate for freeing the brakes whereby the car may be lowered by its weight.

10. Ina safety device for elevators, the combination with a car. a motor. and a weight counterbalancing the car. of friction brakes mounted above the motor, a cable leading from the car to the counterbalancing weight and the movement of the cable being under the control of the action of the brakes. a second cable also leading from the car to the eounterbalancing weight and said second named cable being driven by the motor, spring actuated mechanism operable with the breaking of the cable of the motor for causing the travel of the car to stop by operating the friction brakes and checking the cable of the brakes. a weight element associated with the cable of the motor normally serving to hold said spring actuated mechanism from operating and the weight element being automatically movable with the breaking of the cable of the. motor so that the spring actuated mechanism may operate. a lever with a weight coacting with the spring actuated mechanism for releasably holding the car and means operable from within the car to release at intervals the action of the lever upon the spring actuated mechanism to allow the spring actuated mechanism to operate for freeing the brakes whereby the car may be lowered by its weight.

1.1. in a safety device for elevators. the combination with a car. a motor. and a weight counterba'la'ncing the car. of a frame mounted above the motor. a shaft journaled in the frame, pulleys held on the shaft, a friction brake on the shaft. a cable driven by the motor leading from the car to the counterbalancing weight. a second cable leading from the car over the pulleys of the shaft of the brake to the counterbalancing weight, and spring actuated mechanism operable with the breaking of the cable driven by the motor for causing the travel of the car to stop by operating the friction brake and checking the movement of the cable on '.the pulleys of the shaft of the brake.

12.'In a safety device for elevators, the combination with a *ca'r, a motor, and a weight counterbalancing the car, of a frame mounted above the motor, mshaft journaled in the frame. pulleys held on the shaft. friction brake on the shaft :1 cable driven by the motor l ading from the car to the counterbalancing weight. a second cable leading from the car over the. pulleys of the shafts of the brake to the counterbalancing weight, spring actuated mechanism operable with the breaking of the cable driven by the motor for causing the travel of the car to stop by operating the friction brake and checking the movement of the cable on the pulleys of the shaft of the brake, and a weight element associated with the cable driven by the motor nprmally serving to hold said spring actuated mechanism from operating and the weight element being automatically movable with the breaking of the motor cable so that the spring actuated mechanism may operate.

13. In a safety device for elevators, the combination with a car. a motor. and a weight counterbalancing the car. of a frame mounted above the motor. a shaft journaled in the'framc. pulleys held on the shaft. a friction brake on the shaft. a cable driven by the motor leading from the car to the .counterbalancing weight. a second cable leading from the car over the pulleys of the shafts of the brake to the counterbalancing weight. spring actuated mechanism operable with the breaking of the cable driven by the motor for causing the travel of the car to stop by operating the friction brake and checking the movement of the cable on the pulleys of the shaft of the brake. and releasing mechanism coacting with the spring actuated mechanism for releasably holding the car and said releasing mechanism being operable from within the car to release at intervals the stop action of the spring actuated mechanism for freeing the brake whereby the car may be lowered by its weight.

14. In a safety device for elevators, the combination with a car, a motor. and a weight countcrbalancing the car. a frame mounted abov th motor. a shaft journaled in the frame. pulleys held on the shaft. a friction brake on the shaft. a cable driven by the motor leading from the car to the counterbalancing weight. a second cable leading from the car over the pulleys of the shafts of the brake to the counterbalancing weight. spring actuated mechanism operable with the breaking of the cable driven by the motor for causing the travel of the car to stop by operating the friction brake and checking the movement of the cable on the pulleys of the shaft of the brake. a weight element associated with the cable driven by the motor normally serving to hold said spring actuated mechanism from operating and the weight element bein automatically movable with the breaking of tween the brakes, a pulley on the drive shaft of themotor, an idler pulley in spaced proximity to the pulley on the motor shaft, :1

' cable leading from the car over the movable second end of said second named cable being also fastened to the counterbalancing weight,

' a Weight element associated with the movable pulle with breaking of the cable over the pulley for causing the pulley to move upwardly, s ring actuated mechanism operable with t e operation of the weight for causing the adapted to automatically move.

travel of the car to stop by operating the friction brakes and checking the "movement of the cable on the pairs of pulleys, and releasing mechanism coacting with the spring actuated mechanism for relcasably holding the car and said releasing mechanism being operable from within the car to release at intervals the stop action of the spring actuated mechanism for freeing the brakes whereby the car may be lowered by its weight.

This sperification signed and witnessed this 23" day of April A. D. 1920.

DOMINICK EVANGELIS'R Witnesses M. SORENSON,

J. FREDERICK Caynn.

Images