US1835032A - Suspension device for equalizing the strain on elevator cables - Google Patents

Description

Dec. s, 1931. E EVANS 1,835,032

SUSPENSION DEVICE FOR EQUALIZING THE STRAIN ON ELEVATOR CABLES Filed Sept. 16J 1929 Patented Dec. 8, 1931 UNlTED STATES PTNT OFFICE `PII EVANS, OF BEDFORD, INDIANA, ASSIG-NOR TO EVANS ELEVATOR EQUALIZ'ER CMPANY, OF BEDFORD, INDIANA, i CORPCRATIGN OF INDIANA SUSPENSION DEVICE FOR EQUALIZENG THE STRAIN ON ELEVATOR CABLES Application lecl September 16, 1929.

The present invention relates to a device for equalizing the strain upon a group of cables, such as those commonly used to suspend an elevator car used for transferring passengers or freight from one licor of a lbuilding to another. ln the type of elevatorsmost widely used the group of hoisting cables, .usually about six in number, though a greater or less'number may be employed, tracl: in a corresponding number of grooves formed in a suspension pulley or drum at the top of the elevator shaft, the weight of the car being according to usual practice counterbalanced by weights also con nected to the suspension cables. Because of vunavoidable variations in manufacture the cables are liable to stretch unequally, and in case of replacement of one or more cables, because of vari ations in wear and stretch as between the new and old cables, as well as variations in the diameter of the groovesin the pulleys engaged by the cables, the cablesdo not, if rigidly connected to the car, at all times in the travel of the car, especially in the case ot tall buildings, sustain an equal load, and the cable upon which the greatest load is thrown is subject to 'the greatest wear and liability of breakage. My present invention relates to a. type of suspension device in which the load oi: the car is sustained and equalized by a body of liquid, preferably oil, interposed between a series of inter-communicating cylinders connected to the car, and a series ot pistons in said cylinders connected severally with the hoisting cables. The object of my invention is the provision or" a suspension device ot the type which in the construction and arrangement of its mechanical parts and members shall be better suited and adapted to perform the functions and, accomplish the results for which it is designed than 'prei/'ions equalizers of the type in question ylrnown to me. `With this object in view I have designed and invented the novel suspension device hereinafter described in detail,the essential elements of my invention being more particularly pointed out in the appended claims. f

ln the drawings, Figure 1 is a side elevation, onasinall scale, showing in outline an Serial No. 333,098.

elevator car and portions of the supporting structures and lifting apparatus with Iny novel equalizing device applied thereto;

Fig. is what l will term a side view of the device, in a larger scale;

Fig. 3 is an end View of the same; n

Fig. Ll is a top plan view of thesame, the anchor bolts secured to the cables being shown in section and parts of the supporting plates of the car trame being indicated;

Fig. 5 is a vertical section extending axially of one of the cylinders and the piston therein on the dotted line 5 5 of Fig. 4, parts of the structure being shown in elevation; and

Fig. 6 is a top plan view of the top plate of the cylinder frame.

Like reference characters indicate like parts on all the figures of the drawings.

g Referring to Fig. 1, which illustrates an ordinary and well known arrangement of elevator mechanism, the suspension or hoisting cables A, which by means of my novel equalizing device, indicated generally by the reference letter B, are severally connected at one end to the elevator car C, severally engage alternate grooves (not shown) of the suspension pulley D; then grooves of the idler pulley E and then pass around the pulley D again, in the intermediate or adjacent grooves of such pulley, the other ends of the cables being operatively connected with the counterweight and hoisting mechanism, not illustrated.

Describing now in detail the construction of the device B itself, the cylinder frame attached to the car includes a top plate l, and a bottom plate 2, between which are interposed thc tubular cylinder members 3, the top and bottom plates being connected by clamping bolts to clamp the cylinders between them. Pre'ierably for convenience of assemblage, two of the clamping bolts, as the bolts Ll, or il desired a greater number) engage threaded seats in the bottom plate, while the remaining bolts, in the present instance the bolts marked 5,'siX in number, are not threaded in either plate.

The top plate l is formed with cylindrical seats 6 to receive the upper ends oit' the cylintheir lower ends supporting the lower ends ofthe pistons.

' 2. A suspension device for connecting an elevator car to a groupv of hoisting cables comprising a cylinder frame secured to said 'car and a plurality of Vinter-communicating oil-lilled cylinders in said frame, a corresponding plurality of pistons in said cylinders, anda plurality of piston trames including shackle rods slidingly mounted in said cylinder tra-me, said piston frames beingv connected Vat their-upper ends to the hoisting cables and having cross-bars at their lower ends supporting the lower ends of the pistons, said pistons being free to move upon the supporting faces of said cross-bars.

3. A suspension device for connecting an elevator car to a group of hoisting cables comprising a cylinder frame secured to said car, a plurality of inter-communicating oilfilled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a plurality of piston frames including shackle rods slidingly mounted in said cylinder frame, said piston iframes being connected at their upper ends to the hoisting cables and having 'Y cross-bars at their lower ends supporting the lower ends o'f the pistons, and buffer springs interposed between said cross bars and said cylinder frame.

4. A'suspension device for connecting an elevator car to a group of hoisting cables comprising a cylinder frame secured to said car, a plurality of inter-communicating oililled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a plurality of piston frames including shackle rods slidingly mounted in said cylinder frame, said piston frames being connected at their upper ends to the hoisting cables and having cross-bars at their lower ends supporting the lower ends of the pistons, and

bulier springs interposed between said cross bars and said cylinder frame, said buffer springs being normally idle and arranged to be stressed upon movement of said pistons and piston frames to a higher position relative to said cylinders.

5. A suspension device for connecting an elevator car to a group of hoisting cables, said device comprising a cylinder frame secured to the car including an oriliced top plate formed with cylinder seats and an oriticed bottom plate formed with open cylinder seats and a plurality of cylinders seated in said top and bottom plates and clamping bolts arranged to clamp said top and bottom plates to said cylinders, said top plate being formed with passages providing communicaion between said cylinders, a plurality of pistons in said cylinders, and a plurality of piston frames each having a pair of shackle rods slidingly mounted in aligned oriices in ysaid top andv bottom plates of the cylinder trame, said piston frames being each provided with a cross-bar secured to the lower ends of said shackle rods and arranged to support the lower end of the associated pistonK 6. A suspension device for connecting an elevator car to a group of hoisting cables, said device comprising a cylinder trame including an oriiiced top plate secured to the car and an orificed bottom plate torined with open cylinder seats and a plurality of interposed cylinders and clamping bolts arranged to clamp said top and bottom plates to said cylinders, said top plate being formed with passages providing communication between said cylinders, a plurality of pistons in said cylinders, and a plurality of piston frames each having a pair ot shackle rods slidingly mounted in aligned orifices in said top and bottom plates ol the cylinder trame, said piston frames being each provided with a cross-bar secured to the lower ends ot said shackle rods and arranged to support the lower end oit the associated piston.

7. A suspension device for connecting a group of hoisting cables to an elevator car having a pair olf spaced horizontally disposed supporting plates, said device including an oriiiced top plate extending over and resting upon said supporting plates and also including an orificed bottom plate and a plurality of interposed cylinders and clamping bolts disposed between said supporting plates, said clamping bolts being arranged to clamp said bottom plate and interposed cylinders to said top plate and said cylinders being in communication at their upper ends, a plurality of pistons in said cylinders, piston frames connected to said hoisting cables and arranged to support said pistons, a pair oit clamping plates at opposite ends of the device extending underneath said supporting plates, and clamping bolts engaging said top plate adjacent its opposite ends for clamping said top plate to said supporting plates.

8. A suspension device for connecting a group of hoisting cables to an elevator car having a pair of spaced horizontally disposed supporting plates, said device including an oriiced top plate extending over and resting upon said supporting plates and also including an orificed bottom plate and a plurality of interposed cylinders and clamping bolts disposed between said supporting plates, said clamping bolts being arranged to clamp said bottom plate and interposed cylinders to said top plate and said cylinders being in communication at their upper ends, a plurality of pistons in said cylinders, piston frames connected to said hoisting cables and arranged to support said pistons, and clamping means at opposite ends of said suspension device engaging said top plate and extending underneath and engaging said supporting plates.

49. A suspension device for connecting a group of hoisting cables to an elevator car having a pair otspacedhorizontally disposed supporting plates, said device includ-r "ing an oriiced top'pl'a'te extendiiigover and resting upon said supporting plates' and also including an oriliced bottoinplate anda plu rality' of interposed cylinders 'and' clamping bolts 'disposedbetween :said supporting plates, said clamping bolts being arranged to clamp said bottoni platev and interposed cyl-Y inders to said top plate and said cylinders being in coinniunicationat their upper ends, a

` plurality'f-otpistons in said cylinders, piston frames connected to said hoisting cables and arranged to support said pistons, a pair of Y clamping plates at opposite endsv of the device extending underneath said supporting plates, and clamping bolts engaging said top plate adjacent its opposite ends for clamping said top plate to said supporting plates, the sides of said top plate and the ends ot-said clamping plates being formed with retaining lugs extending uponthe outer faoesot said vsupporting plates.

` l0. A suspension device for connecting an elevator` car to a group of equally spaced elevator cables arranged to track in the grooves I of a coniinon supporting pulley, said device coniprisinga cylinder frame secured to the Y cariand plurality oi" intercoininunicating oil-lilled cylinders in said frame, said cylinders beingdisposed in staggered arrangenient in two parallel adjacent planes, la corresponding*plurality of pistons in said. cylinders, and a plurality of rectangular piston frames, each'fraine including ansu'pper crossbarv centrally secured to an associated hoist ing cable and secured at its ends to apair of shackle rods slidingly inountedin said cylinder traine, and a lower cross-ban supporting the lower end of an associatedl piston, the planes oic th-e piston ltrain-es extending in dif- 1 two planes in which the pistons andcylinders are arranged. Y

y i 11. A suspension device for connectingv an elevatorcar to a group ofrhoisting cables comprising cylinder traine secured to said car and a plurality of inter-co1ninunicat1ng Yoi'l-lled cylinders in saidtraine correspond 'fling infnuinher to the number of hoist-ing cables, a corresponding plurality of pistons vin said'cylinders, and a correspondingfplu- Y .iality olf piston frames including yshackle Vrods.,v slidingly inounted in saidivcylinder traine, ,said piston franiesrhaving cross-.bars at their uppergends individually connected to Lseaoee Hoed botto-ni plate formed with open-'cylinder seats and a plurality of cylinders corresponding innumber to the number of'lioistling, cables seated insajid ,top and bottom ni'y naine.,l Y

' Y JOSEPH E EVANS.

Y ferent directions alternately at angles to thel Y thelioisting cables andihaving cross-bars`at f their lower ends individually supporting VYthe i .lower ends crpthefpistons I i K 12. A suspension device iorjconnecting an elevator car tovaf group of hoistingcables,

saiddevice lcomprising acylinder. rame'secured toifthe'car vincluding an orilicedtop fplatev ormedwvitli-cylinder Aseats and an ori-

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