US1852155A

US1852155A - Suspension device for equalizing the strain on hoisting cables

Info

Publication number: US1852155A
Application number: US459474A
Authority: US
Inventors: Joseph E Evans
Original assignee: EVANS ELEVATOR EQUALIZER COMPA
Current assignee: EVANS ELEVATOR EQUALIZER Co; EVANS ELEVATOR EQUALIZER COMPA
Priority date: 1930-06-06
Filing date: 1930-06-06
Publication date: 1932-04-05
Anticipated expiration: 1949-04-05

Description

April 5, 1932. J. E. EVANS SUSPENSION DEVICE FOR EQUALIZING THE STRAIN 0N HOISTING CABLES Filed June 6, 1950 2 Sheets-Sheet 1 April 5, 1932. J. E. EVANS 1,852,155

SUSPENSIQN DEVICE FOR EQUALIZING THE STRAIN 0N ,HOISTING CABLES Filed June 6. 1930 2 Sheets-Sheet 2 Patented Apr. 5, 1932 UNITED STATES PAT NT OFFICE JOSEPH E. EVANS, F nnnronn NnIANA, ASSIGNOR TO EvANs ELEVATOR EQUAL- IZER COMP NY, or BEDFORI), INDIANA, A oonronATIoN OF INDIANA SUSPENSION DEVICE FOR EQUALIZENG- THE STRAIN ON HOISTING CABLES Application filed June 6,

My invention relates to a hydraulic device devised specifically for the equalization of the load of an elevator car, orcounterweight, upon the group of cables by which it is suspended, due to variation in the depth of the grooves in the suspension pulley, variation in the size of the cables, diflerence in stretch of the cables arising from the use of old and new cables together, and other causes; and is go of the same general type as the suspension devices described in my Patents Nos. 1,323,357 dated December 2, 1919 and 1,429,070, dated September 12, 1922, and my pending application forpatent Serial No. 393,098, filed September 16, 1929. My present invention may be regarded as a modification or improvement of the construction shown in my said pending application, in which improvement I employ a plurality of piston frames sliclingly 29 connectedto two suspension cables, and em ploy a novel spring-stressed connection between the cables and piston frames for the purpose of yieldingly stressing the cables to a normal intermediate position in case they should shift, or tend to shift,-relatively to each other. The object of my invention is the attainment of such desirable modifications and variations of construction together with incidental improvements and advantages, as will be apparent from the detailed description of my improved equalizing device hereinafter given. In the appended claims I have set forth the essential elements of my in- P vention, it being understood, however, that my claims are intended to be construedto include all equivalent mechanical parts and modifications of structure which'fall within the true spirit of my invention when considered in connection with the prior art.

In the drawings,

Figure 1 is what will be termed a side view of my novel equalizing device, and fragmentary portions of the frame of an elevator car to which it is shown secured, a portion of the forward frame member of thecar being broken away to show the portion of the equalizing device beyond it;

Fig. 2 is a view as seen at right angles with mounted in the frame of the device and each 1930. Serial No. 459,474.

reference to the position of the parts shown in Fig. 1; I Y

' Fig. 3 is a horizontal section in a plane indicated bythe dotted line 3 -3 of Fig. 1;

4 Fig. 4 is a horizontal; section on theline 4 1 of Fig. 1; and

Fig. 5 is a view corresponding in part to Fig. 2, but illustrating a modified construction of certain parts. i l i Like reference characters indicate like parts in all the figures of the drawings.

It will be understood that thegroup of hoisting cables by means of which the elevator car (or counterweight, as the case may be) is hoisted through the interposed equalizing device to which my invention relates, are arranged to track in the usual manner in parallel grooves formed in a hoisting pulley or drum (not illustrated) at the top of the elevator shaft, and that the top of the car, or counterweight,-which is arranged to travel vertically in the elevator chute, is pro,- vided with suitable frame members for the attachment of my novel equalizing device thereto.

Describing now the construction of the equalizing device, this device'includes what I will term a cylinder frame A, clamped to the upper frame member C of the car, and a plurality ofpistons in the cylinders of the cylinder frame severally carried by piston frames B which are slidingly mounted in the cylinder frame and are each connected to a air of suspension cables. i 1 The cylinder frame A includes a top plate 1 and a bottom plate 2, both formed with cylindrical seats to receive interposed cylinders 3, and clamping bolts 4 bymeans of whichthe plates andcylinders are firmly secured together., The top plate 1 is formed with channels 5 through which all the cylinders are placed in communication with each other, and is also formed with one or more filling and vent passages 65, preferably closed by suitable check valves 7 as shown. The bottom plate 2 is orificed :at the bottom of the annular shoulder which forms a cylinder seat,'in alignment with the inner face of the cylinder thereabove, to form a continuation of the piston chamber.

The number of cylinders may vary in accordance with the number of hoisting cables employed, three being illustrated in the present instance to provide for six cables, which is the number most frequently used.

The cylinder frame above described may be conveniently secured to the elevator car by means of a pair of orificed clamping bars 8-,8, and clamping bolts 9, arranged to en gage such bars and the top plate of the clamping plate, which latter is orificed'to receive them, and to clamp the parts together against the pair of interposed top members C of the car frame. As shown inFigs. 1 and2 the top plate and clamping bars are provided with retaining lugs 10 to position the parts and prevent displacement.

The pistons 11 working in the'piston chambers formed by the cylinders 3 (which latter, it will be understood are filled-with a suitable liquid such asoil) severally rest loosely upon" the crossbar 12 and nuts 14 by means of which the parts are secured together, and are also formed with reduced threaded upper.

ends arranged to engage sockets formed in the horizontal lower portion of a frame bar 15 which has a central vertical portion orificed to receive a pivot pin 16. This pin provides a bearing for a pair of twin equalizer bars 1717 between which, at their opposite ends, are pivoted a pair of blocks 18-18 one at each end, each block being formed with trunnions 19 engaging bearing orifices in the ad jacent ends of the bars. These blocks are formed with threaded vertical orifices to receive bolts 20 which are secured in any suitable manner, as by the turn buckles 21 to a pair of adjacent cables of the group of hoisting cables. The piston frames, it will be noted, are disposed transversely of a line'running centrally through the cylinders, but stand in an inclined position withreference to a true right angle to such line, so that threealternate cables of the group of six may be connected to the ends of the equalizer bars at one side of the equalizer and the three other cables to the other ends of such bars, and all cables will track with approximate uniformity into the grooves of the hoisting Pu l yl e a The lower ends of the bolts 20 are arranged 'toftelescopically engage coiled springs 22,

which are interposed between the upper faces of the horizontal portions of the frame bars 15 and the nuts 23 which engage such bolts underneath the equalizer bars. As illus trated, the springs 22 are provided with upper end cups 24 and lower end-cups 25 which it will be understood are welded to the springs, the lower cups being equipped with anti-friction rollers 26 engaging'the member 15.

It is obvious that in case of a variation in the travel of the two cables connected to the opposite ends of a given equalizer bar (regarding the twin members 17 as a single bar) the bar will assume an inclined position, while the change in stress of the springs 22 associatedwith such bar and pistonframe will yieldingly tend to restore the bar to its original, and normal, horizontal posithe stress under which any, spring -50 is placed by the piston frame with which it'is associated rising to ahigher position will tend to restore it to its normal position, The combined effect of the springs 22 and .55 therefore is to yieldingly permit different rates of travel of the hoisting cables inJthe grooves of the hoisting pulley, opposed by a spring tension tending'to restore them to their original normal position.

In Fig. 5 I have illustrated a modified form of construction of the piston frames of the equalizer in which the shackle rods 13 P13 of each frame (corres onding except as otherwise illustrated and escribed to-the shackle rods 13 of the piston frames above described) extend upwardly from their bearing in the top plate 1 cf the cylinder frame to a block 30 with which they make screw-threaded engagement. This block is orificed to receive the pivot pin upon which the equalizer bars of particular frame are pivoted." ,In this form of piston frame the roller-equipped lower caps secured to the springs which, engage the lower ends of the bolts 20 ride directly upon the upper face of the top platefll of'the cylinder frame, instead I of upon a portion of the piston frame. 1"

'I claim: Y l

1. A suspension device for connecting an elevator carto a group of hoisting cables comprising a cylinder frame secured to said car and a plurality of inter-communicating oilfilled cylinders in said frame,'a corresponding plurality of pistons in said cylinders, acorresponding plurality of piston frames slidingly mounted in said cylinder frame and'havin g lower crossbars arranged to support'said pistons and equalizing bars centrally pivoted to said piston frames severally near the top ends thereof, each bar being connected at its opposite ends to a spread pair of adjacent hoisting cables.

2. A suspension device for connecting an elevator car to a group of hoisting cables comprising a cylinder frame secured to said car and a plurality of inter-communicating oil-filled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a corresponding plurality of piston frames each including shackle rods slidingly mounted in said cylinder frame and a lower cross-bar arranged to support its associated piston and an upper member having a horizontal cross portion secured to said shackle rods and a vertical central portion; and equalizing bars severally centrally pivoted to said vertical central portions of the upper piston frame member near the tops thereof, each bar being connected at its opposite ends to a spread pair of adjacent hoisting cables.

3. A suspension device for connecting an elevator car to a group of hoisting cables comprising 'a cylinder frame secured to said car and a plurality of inter-communicating oilfilled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a corresponding plurality of piston frames slidingly mounted in said cylinder frame and having lower crossbars arranged to support said pistons, equalizing bars centrally pivoted to said piston frames severally near the top ends thereof, each bar being connected at its opposite ends to a spread pair of adjacent hoisting cables, and spring means connected to said equalizer bars severally and arranged to yieldingly oppose change of angular position of said bars.

A. A suspension device for connecting an elevator car to a group of hoisting cables comprising a cylinder frame secured to said car and a plurality of inter-communicating oilfilled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a corresponding plurality of piston frames slidingly mounted in said cylinder frame and having lower crossbars arranged to support said pistons, equalizing bars centrally pivoted to said piston frames severally near the top ends thereof, each bar being connected at its opposite ends to a spread pair of adjacent hoisting cables, and spring means interposed between each of said piston frames and its associated equalizer bar arranged to yieldingly oppose change of angular position of said bar.

5. A suspension device for connecting an elevator car to a, group of hoisting cables comprising a cylinder frame secured to said car and a plurality of inter-communicating oilfilled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a corresponding lurality of piston frames each including shac 1e rods slidingly mounted in said cylinder frame and a lower crossbar ar-V ranged to support its associated piston and an upper member having a horizontal cross portion secured to said shackle rods and a vertical central portion equalizing bars sev- Y tion of said bars.

6. An equalizing device according to claim 3 in which said spring means consists of a pair of coiled compression springs interposed between opposite ends of the particular equaltherebelow.

7 An equalizmg device according to claim 3 in which said spring means consists of a pair of coiled compression springs which are connected at their upper ends to opposite ends of the equalizer bar and are provided at their lower ends with cap members equipped with rollers bearing upon faces on portions of the device below said springs.

8. An equalizing device according to claim 3 in which-the pairs of hoisting cables are connected to, bolts which are pivotally connected to and extend below the ends of the particular equalizer bar, and in which said spring means consists of a pair of coiled compression springs telescopically engaging the ends of the bolts.

9. A suspension device for connecting an elevator car to a group of hoisting cables comprising a cylinder frame secured to said car and a plurality of inter-communicating oilfilled cylinders in said frame, a corresponding plurality of pistons in said cylinders, a corresponding plurality of piston frames slidingly mounted in said cylinder frame and having lower crossbars arranged to support said pistons, springs interposed between said cylinder frame and said crossbars, equalizing bars centrally pivoted to said piston frames severally near the top ends thereof, each bar being connected at its opposite ends to a spread pair of adjacent hoisting cables, and springs interposed between each o-fsaid piston frames and its associated equalizer bar arranged to yieldingly oppose change of angular position of said bar.

In testimony whereof, I have subscribed my name.

JOSEPH E. EVANS.

izer bar and facesupon portions of the device