IL35315A - Apparatus for gripping and pulling a rope - Google Patents

Description

Apparatus gripping and pulling a Shis invention relates to apparatus for gripping and palling a metal rope of the type wherein there are provided two vices in line in being adapted to work and each in torn gripping and moving the rope and then releasing it and moving along it to take a fresh for effecting displacement of a load or weight attached to one end of the The vices are movable parallelograms gripping influence of the rope traction in such a manner that with increasing load the increasing of the gripping force is In apparatus practically used of the general type the jaws of the gripping blocks are linked with a system of levers by means of holes and corresponding pins of displaced circular the diameter of the holes being possibly longer than that of the These links are rapidly worn with heavy load the friction becomes excessive and the motion is at a certain moment the rope with its load will The invention avoids these risks by means of pairs of jaws forming with pairs of levers a so that the after a contacting of the jaws with the fixes itself by the traction force emanating from the in such a manner with increasing longitudinal the gripping force is proportionally that excessive working and cessive damaging the rope are avoided as will as the risk of The returning pair of on the other will open themselves by the action of the relatively pushing rope and so be saved from sliding along the The deals with an apparatus for and pulling a rope with two pairs of alternatively and pulling the releasin and moving the ized in that each pair of jaws is forming with a pair of through the medium of round a parallelogram by the action of an operating connected with said are narrowing when advancing in and approaching to the rectangular shape when going said pair of jaws being by a system of levers pivoting on sideways from axis of the with operating at the beginning o the the yet over its most rectangular form the by the medium of the rope and the contacting as working operating produce a rotative momentum upon levers resulting in the narrowing of the Constructors of rope pullin apparatus till now started from the idea that a longitudinal relative of during their contacting with the rope must be being harmful to the unexpectedly and surprisingl the limited relative longitudinal motion of the inherent present has been found to produce an especially soft gripping increasing lifetime of the Existing constructions desire gripping blocks wards and o a strictly straight presen invention allows the gripping blocks to execute small transversal translations and pivoting motions the plane of The intermiediate levers between the grippin blocks pair of the operating handle are thus When the operating handle turned to the left and the moved towards the side of the the the opposite jaws and the jaws 15b move and releasing is mainly produced by the reaction of the rope and only initiated by the lational moving of the gripping When the operating handle is right the workin the two pairs of jaws will be order to the rope backwards let down the the reverse handle 18 is nked with the levers 9 through bearings and the intermediate lever With that when the are i gripping the drive back instead of ro e 21 set both pairs of jaws are opened for easy introduction o the Othe forms of of the invention deal reversed location of the levers 9 10 or of the intermediate lever 20 the lever pair attached to lon with such details it will possible to put the operating handle and he reverse handle 18 with the same orientation same The of the invention depends mainly upo the The gripping is effected by parallel motion of the After a preliminary gripping or the work of the operating handle the gripping is the result of rotative momentum by the force working along the oblique direction of the levers relatively to parallelogram sides assures the desired decreasing of the reverse operation depends upon establishin the pivoting axes of th lever system on the insufficientOCRQuality

Claims (3)

1. 353 ΐδ~
2. 2 WHAT IS CLAIMED IS: 1, Appaaatus for gripping arid pulling a rope comprising two pairs of altematingly actuated gripping jaws* two jaws of which · together with two clamping levers pivotally connected to the jaws *- form a four bar linkage and which further comprises an actuating lever tumable withi the casing of the apparatus which latter lever is connected with the clamping levers b means of a linkage which linkage is linked to the actuating lever at two diametrically opposite points (relative to the Jjuming axis of the actuating lever)* characterised thereby that at least one clamping lever (9*10) of each pair of gripping Jaws (14,15) is extended beyond the connection point of each Jaw co-ordinated to one side of the rope* and further characterised thereb that the link connecting each four bar linkage (9,1^,10,15) with the actuating lever consists of one side plate (7) which extends substantially in parallel with the axis of the rope which plate is applied to the end of one, possibly of both clamping levers (9*10) and thereby that the extended, opposite ends of a clamping lever of each four teew linkage ae interconnected pivotally by the lower portion of the reverse lever (18) and an Intermediat lever (20) connected the ewith and further thereby that the four bar linkages are controlled in their forward and rearward movements solely by the said double connection to actuating and reversal lever without employ of any guide rails, 35315- the clamping levers and the two gripping jaws (l 15).
3. 3. The device claimed in claims 1 or 2, characterised thereby that each of the side plates (7) carries as pressure spring (17) whj h with its free end presses onto at least one lever of each pair of clamping levers (9*10) exerting a force in the direction of action of the jaws.