US912256A

US912256A - Elevator.

Info

Publication number: US912256A
Application number: US28856005D
Authority: US
Inventors: Michael E Neenan
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-11-22
Filing date: 1905-11-22
Publication date: 1909-02-09
Anticipated expiration: 1926-02-09

Description

M. E. NEENAN.

ELEVATOR.

APPLICATION FILED APILZQ, 190s. RENEWED NOV. 22,1905.

SHEET 1.

Patented Feb. 9, 1909.

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M. E. NEENAN.

ELEVATOR.

APPLICATION FILED APR.29, 190s. RENEWED Nov..22,1905.

Patented Feb. 9, 1909.

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MICHAEL E. NEENAN, OF NEW YORK, N. Y.

nnnvnrca.

Application filed April 29, 1903, Serial No. 1%,835.

To all whom it may concern:

Be it known that I MICHAEL E. NEENAN, a citizen of the Unite States, residing in the borough of Manhattan, in the city, county, and State of New York, have invented certain new and useful Im rovements in Elevators, of which the fol ovving is a specification.

My invention relates to frictional driving apparatus for elevators and consists of a device combining the opposite sections or leads-of the ropes passing on and off the drivingapparatus whereby the tension throughout said ropes is regulated by' the. load suspended therefrom. By my invention weights as used heretofore to a ly tension to the ropes are dispensed vitli, and it is rendered impossible for anyincreased load on the car or sudden stoppage of the same to cause the frictional driving mechanism to slip. To this end the ropes and sheaves are so disposed, and the car so suspended there' from, that While the weightofthe carholds in tens on 1ts direct suspension and-hoisting ropes, it also holds in. tension the opposite leads of the ropesand takes up the slack thereof, and aipliesigreater tension to the said opposite eadsof the ropes when the load on the car causes increased tension on its direct suspension or hoisting ropes, or inertia is to be overcome;

In the accompanying drawings, Figure 1 is an elevation of an elevator mechanism illustrating my invention Fig. 1 is a diagrammatic elevation illustrat ng the application of a rope-counter-balance to the embodiment of the invention shown in Fig. 1. Fig. 2 is an elevation of the car and its appurtenances showing a modification; 3

is a bottom view of the car audits accessories shown 111 Fig. 2; Fig. 4 is an elevation of another modification; and Figs.- 5 to 12, inclusive, are diagrammatic elevations of still further modifications, which illustrate modes of carrying into effect the principles of my invention.

Referring to Fig. 1, 11 represents .the elevator car suspended by ropes 12 carried over a suspension sheave 13, from whence they pass down to and around a frictional driving drum or drums 14 of suitable construction, and thence up to the bottom of the car being carried over a fixed guide sheave 15 in a hanger 16 and around a pair of movable sheaves 17 mounted in horizontal slides 18, the ends of the ropes being fixed to the hanger Specification 01' Letters Patent.

'Paten'ted Feb. 9, 1909. Renewed November 22, 1905. Serial nolesaaeot.

16 at 19. The upper parts of the ropes 12 from which the car is suspended pass through tlie hollow piston rod 20 of a dash-pot 21, being secured by

clamp collars

22, 23, above and below so as to'fix the ropes in'vertical adjustment in said hollow p ston rod and permit their adjustment therein from time to time when necessary to compensate for stretching of the ropes. Thus When-stretch:

ing of the ropes causes the dash-pot piston to reach the end of its stroke in its cylinder, the clamps are loosened and..the piston read justed to its primary position. The-dashpot cylinder 21 has a suitable by-pass 21 v and 1s firmly fixed to the top of the car by means ofabracing frame 24,01 it may be arranged similarly on the bottom of the car, or in any other desired position, so as to perform its office. The oliice of the dash-pot is to con trol the action of the tension-slack-rope take-up device so as to prevent thereby 'a too sudden or jumping movement of the 'car,

From the lower clamping collar 23 beneath the dash-pot piston rod, the ropes l2 separate and are carried ar und guide

sheaves

25, 25 dotvn the sides of the car and aroun'

guide sheaves

26, 26 at thebottom, and are attached at their ends to m the horizontal slides 18, so that the weight of the car and its load tends to draw apart thesaid slides in which the movable sheaves 17 are mounted. In opposition to thisthe tension of the lower part of the ropes, carried up from the frictional driving drums 14 to the bottom of the car and carried around the movable-sheaves 17, tends to draw said sheaves together so that a constant balance is maintained, and.

tension applied to the said lower part of the ropes and consequent friction onthe driving drum automatically regulated by the Weightof the car and its lead. Suitable counter- Weights-36 may be applied to the ropes 12 to counter-balance the normal Weight of the car.

It should be noted that in 1*. lg; 1 the car is suspended in a loop, the maximum strain being thrust upon the take-up device. This comprises two portions, each having a m'ited to-and-fro movement. It should be observed that the take-up device acts in the'manner of a giveand-ta re connection, and that upon changes of load it relieves the strain on one lead extending from the driving apparatus and r increases the strain on the other lead. i101".-

instanoe, if the driving. apparatusis'stopped and the inertia of the car tends to continue which their ends are secured;

or fixed to the sheave 27 so as to, turn there-- movement of the same downwardly, the strain on the righthand lead is relieved or made less than it would'be' if it were connected directly to the top of the car, whereas the left-hand lead is tightened or hasthe tension therein increased to' prevent its becoming slack. and therefore to prevent slipping of the power transmitting rope on the driving sheave or drum. 1

In the modification shown in l igs. 2 and 3, the lower ends of the suspension ropes 12,

afterfpassing as tefore around the guide sheave- 15 on the bottom of the car, are

carried around a second fixedguide sheave 15 and coiled on a ta. e'up sheave 27 to Integral with with, is a smaller sheave 28, on which the upper parts of the ropes 12 are coiled so that a strain appliedto the said ropes ly' the load on the car tends to rotate the coml ined

sheaves

27, 28 and there'l'y wind u the lower part of the ropes: 12 on thelirrger sheave 27; thus, as before, ta ing up the slack and applying tension to the lower or opposite lead of the ropes regulated by the load on the car.

In the modification shown in Fig. 4, the car ropes 12 are carried around guide sheaves 25, as efore, and are connected at their ends to levers 29 fulcrumed at 30 onthe bottom of the car. The connections of the car susension ropes with the levers 29 are near the ulcrums thereof, and the meeting ends-of said levers are connected to the lower parts of the ropes, coming up from the driving drums 14. The meeting ends of the'lever's 29 are also connected to the depending end of a rope 31 running over the fixed sheave 15 on the ltottom of the car and attached to the end of the rope-counterhalance chain 32 which is suspended therefrom. This chain serves the double purpose of counterbalancing the weight of the lower art of the ropes 12 exerted on the tension evice from which they are suspended at the bottom of the car, as this lower part of the r0 es is elongated by the rising of the car; ant also, in conjunction with said ropes, counterbalancing the weight of thesuspension ropes above the car as this is elongated when the ram, Fig. 5, a loose sheave 33 is suspended rom the upper ends of the suspension ropes 12, a'ndthe lower ends of thesuspension ropes passing around guide-sheaves 15, 15' mounted on the bottom of the car are carried up and over the loose sheave '33'and attached at their extremities to the top of v the car. In this illustration of the invention the downward strain of the car applied to the terminal ends of the sus ension ropes 12 33, ap ly double tension to the upper section of set ropes and single tension to the lower sections so as to increase ordecrease the said tensions on the ropes correspondingly with the load on the car, as in the other illustrations.

' The diagram Fig.6 shows the same device drums, and 12 the endless rope driven thereby and carried over loose sheaves 34,

will, through the medium 0 the loose sheave 35, respectively, hung from the extremities of the ropes 12-and"12?,. In thisillustration likewise the strain ap lied to the rope'12'by weight of the car an its load, through the medium of the sheave 33, will take up the slack and automatically graduate the tension on the opposite leads of the ropes to:

correspond wit plained. p

Instead of the \ropes 12 being carried around guide sheaves 25 2 6 onboth sidesof the load, as before ex:

the car, as Fig. 1',they may pass on onev side only,-as shown in Fig. 7, and be con- Inovable slt eave bein dispensed with.

Instead ofthe twoevers29 shown in Fig. 4, a single lever may be employed, the ropes being carried down-on one side of the car, as in Fig. 7, and this lever ma y' be mounted 'on to of the car, as shown in Fig. 8.

he same effect described with referenceto Fig. 5 maybe produced withthe arrangement of ropes shown in Fig. 9, in which the bottom sections of the ropes are carried around guide sheaves 25*, 25*, 25, 25", tl'ience over the loose sleeve 33 and attached to the top of t" e car. This produces a double take-up effect by associating the ropes with the

sheaves

25 and 33.

In the diagram Fig. 10, the car 11 is suspended at one end of the car-ropes 12 which pass over a sleave 33 and are attached at tl'eir other ends to the counterweight 36.

he sl eave 33 is hung to the secondary driving rope 40 passing over the fixed sheave 13, thence downward under a sheave 41 mounted on the top of the counterweight S6, thence up nected to one movable sheave 17, the other and over a fixed sheave 42, thence downand around the motor-drum 14, thence up and around a sheave 43 mounted on the bottom of the counterweight 36, thence down and around a fixed sl eave 4 4, and thence up to 3 and around the fixed sheave 13, as already w of the car applied to the secondary driving rope 40- maintains tension on said driving rope, automatically takes up anyslack therein, and regulates the friction on the motor' drum 14 according to the load on the car.

It should be noted that in Fig. 14) the parts may be so designed that the fixed sl eave 13 may have a limited degree of rotae tion so that said sheave in reality acts in the manner of a pivoted tension lever; Obviously the sheave 13 may be made or any desired diameter. The'advantage of this arrangement is that th e action of the take-up device is direct and, furthermore, that the cables suspended from said sheave 13, are maintained substantially vertical. The latter advantage, however, is not of so great importance as it is found in practice that the movement of the sheave 13 wouldbe small in acting as a te'nsioning device tovary the tension in the leads" winding on and on the drumto prevent slipping. v p

In the diagram Fig, 11 tbeseconda driv ing rope 40 is dispensed with by carrying the:

car-ropes 12 over one or more fixed sheaves 13, thence down beneath a sheave 41 from which the counterweight 36 is suspended,

thence up over fixed sheave 42, thence down.

around the sheave 41 mounted on the top of the counterweight, thence up and over a fixed sheave 42 thence down andaround the motor-drums 14, thence u and over the sheave 43 mounted on the bottom of the counterweight, thence down and under the fixed sheave 44 and thence up to the bottom of the counterweight to which said car-ropes 12 are attached at their lower end.

Figs. 10 and 11 show a motion-reducing gear of twoto one and three to one respec ti rely, referring to the reduction of motion between the rope on the face of the driving drum and the car. With a structure on the principle illustrated in Fig. 11, this can be carriedout to 'any extent desired where the reduction is represented by'a'n odd number,

ropes 12- are carried from the car 11 over a rope attached to the bottom of the counterof the same. I under the car, as in Fig. 1, cause a tension 'efl ect e uivalent to four-to-one of the weight effect of one and one third to one.

fixed sheave i3, thence down under sheave 41 mounted on the top of the counterweight 36 thence up and over a fixed sheave 13, thence down to and around the motor-drums 14 and th ence up to the bottom of the counterweight 36 to-which the lower end of said carropes is fixed. Under this arrangement it wi 1 be apparent that the travel in either direction of the ropes 12 between the drum 14 and the bottom of the counterweight 36 is compensated by that between the sheave 13 and the'top of the counterwe" ht so that movement of the counterweight own or up imparted by rotation of the .motor -drum is communicated with equal motionin raising or lowering the car. It will also beseen that the weight of the ear, acting. through'the me: dium of the sheave 41, necessarily exerts a two-to-one upward draft on the hoisting weight, and a one-to-one draft on the opposite lead of the rope from the drum, so as to take 11 slack and apply tension to both leads oi the rope and consequent-friction on the driving drum'regulatedby the load-on the car. I

While each of the arrangements described possesses structural and operative advan-i tages ofits own, and some of tl1e.parts -thereof are interchargeable, it will be evident that the-difierent arrangements of the sheaves or I lovers of the-tension: device afford simple means forv causing the weight of the car or momentum of the same to graduate the ten-' sionftobe applied to'the ropes on both sides 100 of thevdriving drum, and consequent friction The two movable sheaves of the oad between the respective leads,

while a single movable sheave, as in Fig. 7,

produces a tension of two-to-one. The arrangement shown in Fig. 11 causes a tensipn T 1e levers (Fig 4) and the two sheaves under-11o the car (Fig. 2) which act virtually as continuous levers, admit of a finer graduation and can be used to obtain this effect if found desirable in the other structures.

Heretoi'ore, in frictional driving elevator mechanism, the weight of the tension devices was fixed according to the maximum load the elevator was built to carry. Hence it will beclearly apparent thatthe weight of the tension device above that required by the various loads is detrimental, causing a loss of power and increased wear on the mechanism, and consequent reduction in the life of the same; whereas my invention elevator machinery of causing the tension on the ropes on both sides of the driviugdrums' to increase or decrease automatically according .to the load which may include inertia achieves the ideal result in frictional driving when the car is started from rest and momen 18G elevators.

tum of the moving masses when the car is being stopped, as well as the actual weight to be lifted or lowered.

In the foregoing description, I have referred to ropes 12 in the plural number,

because in passenger elevators the hoisting ropes are commonly used in gangs for additional security; but for simplicity of representation, I have shown in the drawing a single rope as viewed from one side of the gang, except where the ropes are bifurcated or separated to pass around opposite sides of the car. The invention may, of course, be used with one or with any desirable number of ropes.

Figs. 2 and 3 or connected to the respectivelevers 29, as shown in Fig. 4. The tail end of the ropes carried up from the driving drum to the bottom of the car may be united in one by means of a clamp, such as shown in Fig. 1 so that a single rope extends to and around the pulley 15, as shown. in Figs.

and 3. Or the plurality of ropes may he carried up in one plane, which, when viewed edgewise, Wlll appear as a single rope, as

shown in Fig. 1. As the strain on thistailendof the rope is one-fourth or even less,

than that on the head end from which the car is suspended, the use of a single rope at bottom as shown in Figs. 2, 3 and 4 is entirely feasible.

The illustrative structures shown may be modified in various ways in carrying into effect the principles of my invention.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent.

1. The combination of a frictional driving system comprising power-transmitting means, and a pliances operated by the load for varying t 1e tension in said transmitting means upon changes of load and in direct proportion thereto.

2. The combination of a load-carrying device, and a rope drive connected thereto and comprising means to apply tension in the rppes and to automatically regulate such tension. 7

3. The combination of a car or carrier, and

a re c drive therefor comprising means oper' ate by the load to elicct the application of variable tension in all the ropes and to regulate such tension.

4. In a rope drive elevator, the combinas tion with a car, of a system of ropes connected thereto, and. apparatus for driving said means actuated directly by the load to apply tension to the ropes.

combination with driving apparatus, of a car, connections between the driving apparatus and car, including means for regulating the tension in said connections in accordance with the load.

6. In a frictional driving elevator, the combination with driving apparatus, of a roar, a rope system connecting the driving apparatus and car, and means operated by the load formaintaining said rope system taut when at rest or in motion.

7. In a frictional driving elevator, the combination with driving apparatuspf a car, ropes connecting said driving apparatus and car, and means permitting the load to apply tension to the rope leads extending from the driving apparatus.

8. In a frictional driving elevator. system, the combination of a car and driving drum, and suspension ropes suitably connected therewith, and a tension slack rope take-up device operated to apply variable tension and pressure to the ropes and frictional driv ing mechanism governed by the load on the car.

*9. In a frictional driving elevator mech anism, the combination of a car, a hoisting rope or ropes therefor, a driving device on which the rapes are coiled, and a rope takeup device actuated by the weight of the car and its load, said car and take-u device being connected to all the leads of t 1e ropes winding on and oil the driving apparatus and applying to all said ropes tension changing with the load.

10. In a frictional driving elevator mechanism, the combination of a car, a frictional driving drum, sus ension ropes passing down on the side of t e car, and a rope take- 11p device connected with the car and with said ropes, so that the weightol the car and its load can ap )ly tension, changing with the load, to all leads of the ropes winding respectively on and oil the driving drum.

ii. The combination with frictional driving apparatus, of a car, connecting means between the frictional driving apparatus and said car, and means associated with said connecting-means for varying the tension inthe leads of said connecting means when the load varies.

12. In a frictional driving elevator, the combination-with driving apparatus, of an elevator car, ropes connecting the driving apparatus and car, and means or efi'ecting the application of tension in proportion to in the operation'otf the elevator;

13.. The combination with a "IllCilOIlQd driving apparatus, or a loadcarrying device,

ropes, the said system of ropes comprising the load, to the leads of all the ropes winding 7, respectively on and oil the driving apparatus 5. In a frictional driving elevator, the

flexible means for connecting the load-carrying device to the driving apparatus, and means for effecting a variation in the tension of all the leads of said connecting means in direct proportion to variations of load.

14. The combination with a frictional driving apparatus, of a load-carrying device,

flexible ropes or cables connecting said load- .carrying device to the driving apparatus, and

means for effecting a variationin the tension of all the leads of sa d ropes in a predetermined ratio to the weight of the load.

15. In an elevator, the combination with 16. In a frictional driving elevator mechanism, the combination of a loadcarrying device, a frictional drivingapparatus, flexible means looped around the driving apparatus and driven thereby, and a connection between the leads of the driven flexible means whereby the weight of the car and its load holds tight all the said leads winding respectively on and off the drivin apparatus, and the tension on said leads c anges with the load.

17. The combination with frictional driving apparatus, of a load-carrying device, connecting means between the frictional driving apparatus and said load-carrying de vice, and means for regulating the tension of said connecting means to effect a variation of tension throughout the latter in proportion to variations of load.

18. In a frictional driving elevator, the combination with frictional driving ap aratus, of a load-carrying device, flexi le means for connecting the driving apparatus and said load-carryng device, and means for regulating the tension of said flexible means to effect a variation of tension throughout the latter in pro ortion to variations of load.

19. The com ination with a frictional driving apparatus, of a car, flexible connection betweeh the driving apparatus and said car, and means associated with said connection for effecting a variationin the tension in said connection in direct proportion to variations of load.

20. In a frictional drivingv elevator, the combination with an elevator car, of driving apparatus, ropes connecting the driving apparatus and the car, and means permitting the weight 'of, the car to apply variable tensionto the leads of all the ropes winding respeotively onand off the driving apparatus in the o eration of the elevator and to regulate suc tension in accordance with theload.

ng respectively on and off the driving appara- 21. The combination with a frictional driving apparatus, of flexible means driven thereby, a load-carrying device connected to said means, and a connection between the opposite leads of the same winding respectively on and off the driving apparatus,

' whereby tension on all the said leads changes with the load.

22. The combination with a frictional driving apparatus, of flexible means driven thereby, a load-carrying device, and a connection between the load-carryin device and all theleads of the flexible means windtus, whereby tension on all the said eads changes with the load.

23. The combination of a frictional driving apparatus, flexible means driven thereby, a load-carrying device connected to said flexible means, and a connection between the load-carrying device and the o posite leads of the said flexible means, w h tension changing with the load and in a redetermined ratio to the weight of the loa is applied to all the said leads winding respectively on and off the driving ap aratus.

2a. In an elevator, the com ination with a car, of frictional drivinghaeanapowe'ttransmitting means, and means connected between the car and the opposite. leads of said power-transmitting means to vary the tension in the said leads when the load varies.

25. In an elevator, the combination with driving apparatus, of ower-transmitting means, a load-carrying evice, andv a variable connection between the load-carrying device and the power-transmitting means to effect tension in the latter in proportion to the load.

26. In a frictional drive, the combination. with a frictional driving drum or sheave, of a car, power-transmitting means connecting the drum. and car, and a device having a limited degree of movement-to cause the load to place said power-transmitting means variation of load.

27. In an elevator, the combinatiomwith V frictional rope driving apparatus, of a loadcarrying device, ower-transmission means comprising fiexib e ropes or cables, and a 'tensioning device having oscillating load, and in a predetermined ratio thereto,

is applied to all the leads of the ropes winding on and off the frictional driving drum in the operation of the elevator.

, 31. A frictional driving elevator mechanismcom risinga car, a driving drum, a rope coiled t ereon and having a suitable suspensory connection with the car, and a rope take-up device connected to the car and applying tension therefrom to the lead of the rope-opposite to that by which the car is suspended, whereby tension, changin with' the load, is applied by the weight of t ecar and its load to allvthe leads of the ropes winding on and off the drum.

3 32. The combination with a car, ofa frictional driving drum, suspension ropes associated with said drum andconnected to the car, and a tensinn-tak-up device applying variable tensionto' the leads of the ropes on the driving drum opposite to those from which the car is suspended.

33. In an elevator, the combination of a car, a driving sheave or drum and powertransmitting means, and a take-up device aoplying variable tension to the section of t e power-transmitting means extending from the driving drum or sheave.

34. In a frictional driving elevator mechism,--the combination with a car,of adriving drum and ropes connecting the same, and a tension slack-r0 e take-up device operating to apply variab e tension to the ropes and pressure between the latter and the drum, such tension and pressure beingfgoverned by the load on the car.

35. 'l he combination of frictional driving apparatus, a load-carrying device, powertransmitting means associated with'the driving apparatus and connected to the loadearrying device, and a take-up device for' varying the frictional connection between the driving apparatus and said power-transmitting means in accordance with variations of load. y

36. Ina frictional driving elevator mechanism, the combination of a car, a frictional driving drum, suspension ropes passing down on'thesides of the car, and a take-up device ropes, a frictional driving drum, guide ropes being in suitable connection with the car, separating at the top of the car and passing down on opposite sides of the same and connected respectively to said sheaves.

-39. Ina friction driving elevator mechanism, the combination of a car, a frictional drivin "drum, ropes driven by said drum in suitab e. suspensory connection with the car, separating at the to of the car and passing down on opposite si es thereof, and movable sheaves connected respectively to the ends of said descending. ropes so as to be drawn apart thereby and having the section of the ropes 0(pposite to that from which the car is suspen ed looped around them so as to receive tension by the drawing apart of said sheaves.

40. In a friction driving elevator mechanism, the combination of 'a car, suspension 9s sheaves at the sides of the car, a take-up device comprising movable take-up sheaves tothe boxes of which the extremities of the upper sections of the ropes are connected I so as to draw said take-up sheaves apart by the weight of the load, the sad take-up device carrying the lower'parts o the ropes around the take-u sheaves so as to draw said sheaves toget er in opposition to the weight of the car and ap ly tension, changing with the load, to all the leads of the rope winding on and off the driving drum.

41. The combination of a frictional driving apparatus, ropes driven thereby, a loadcarryingdevice connected to said ropes, and a giveand-take connection between the load-carrying device and all the leads of the rope winding respectively on and off the driving apparatus, whereby tension on all theleads of the ropes changes with the load.

'42. In an elevator, the combination with driving apparatus, of power transmi ting means, a load-carrying device, and means for relieving the strain of the lead of said powertransmitting means winding off the driving apparatus, and substantially at the same time tightening the lead winding on the driving apparatus.

43. In an elevator, the combination with frictional driving apparatus, of power-trans- 125 mitting means comprising ropesor cables, a

' oer suspended in a loop of said power-trans balance chain connected to said mitting means, one end of said loop being connected-directly to one of the leads extending from the driving apparatus, and a take-up device between the other end of the loop and the other lead.

44. The combination with a car, of rope drive apparatus connectedthereto and com prising means for regulating the tension in.

the ropes of said apparatus, and :a counterregulating means.

45. Thecombination with a car, of rope drive apparatus therefor comprising a takeup devlce for maintaining the ropes of said which the car is suspended, and a chain con.-

' rope s nected to said'tensioni'n device to counteract the Wei ht of the lea s thereon as-the car ascends an descends."

4' 7 In a frictional driving elevator mesh; ani'sm, thecombination ot-a'cana driving l .ifl ithe :ther'em drum, suspension ropes driven by said drumand suitable I suspensorygconnection .with; the car,"a--rope'jtake-up device-actuated bythe Weight of the car and its loadand apply-' ingtensionfchanging with the load to the 's'us'pefn ed, and-a chain so connected thereto as to counteract the-weight of-the ropes' on said-take-up-device.

4 8 Thef,combination withfiagrop'e drive elevator" com rising a: car orcarrier,-' of a slack ropeta ing-up device,"a nd 'daslipo't mechanism ior controlling said take-up device to'preventsudden movement ofthe load in either direction.

49. The comb'n'ation-with a car, of rope drive afiparatusftherefor' coin rising a slack e-updevice, and das -po t mechanvism for controlling said take-up device to prevent sudden movement of the load in either direction.

50. The combination with frictional driving" apparatus, an elevator car and power- Itransmitting ropes, of a slack rope take-up device, and an adjustable dash-pot device carried by the car for controlling said takeup device to prevent sudden movements of the car.

51. The combination with driving apparatus, of an elevator car, ropes or cables connecting the driving apparatus and said necting ropes or cables, a tensionmg device operated by the load, and a cushioning device to prevent teetering of the car.

4 53. In a friction driving elevator mechanism," the combination with a car and a frictional driving drum, of suspension ropes suitably connected to the car and drum, a takeup device applying tension to the lowersection of the suspension ropes, and a dash-pot device connected to the suspension ropes and car so as to prevent sudden movement of the car.

54. In 'a friction driving elevator mechanism, the combination of a car, a frictional driving drum, suspension ropes, a dash-pot device through which the suspension r0 es are connected to the car, and; means for X- ing 'thesuspensionropes -adjustably with" relation to the dashot device.

55. In a frictiona driving'ele'vator mech-. anism,'the, cornbination of a car, suspension ro Yes,a.fdash po t" cylinder fixed to the car, a qwifida'sh potpiston-{rod through which t je Qpes-a-re-passed, andclampsabove and --ther -'dash'-.pot piston, by means of ropes are secured adjustably 57. ,Ilhe combination with driving apparatus," :ofan elevator car, a counterweight,

'po'werrtransmitting ropes or cables, a takeupdevice, and a dash-pot device, said poweraratus, the counterweight, the car, t e

dash-pot device and the take-u device.

58. In an elevator, the com ination with frictional driving apparatus, of a load carrycombination with driving appar'atus,-of n elevator car, power-transmitting lead of. the ropes winding-,onthe driving {drum 9 posite; that from which, the ca r transmitting ropes connecting the driving a ash-potand take-up device and being divided into a double set of ropes between the ing device, flexible ropes or cables connecting said load carrying device with the driving apparatus, and a tensioning appliance comprising a part having a narrow range of relative movement, said ap liance being asso ciated with said ropes to tighten the leads on itheddriving apparatus proportionately to the MICHAEL E. NEENAN- Witnesses:

J. GREEN, OCTAVIUS KNIGHT.

95 ropes-orcables, a slack rope take-u device comprising sliding sheaves connecte to said ropes and carriedby the car, and means for .limitingthe movements of said sheaves.