GB1364524A - Portable cable hauling devices - Google Patents

Abstract

1364524 Cable hauling devices DECAUVILLE 29 July 1971 [29 July 1970] 35638/71 Heading B8B [Also in Division F2] A portable cable hauling device comprises two relatively movable clamps A, B controlled by two external levers, one lever 5 being for traction and the other lever 26 for release or unwinding of the cable C, each of the clamps having two cams 13 for applying cable-gripping pressure to jaws 11, 12 of the clamp, concentric stub shafts 13a extending laterally from the jaws 11, 12 and carrying guide rollers 18 which engage in longitudinal guideways la, 2a dished symmetrically in the rear and front cheeks 1, 2 of the casing of the device thus providing rectilinear and coaxial movement of the jaws of the clamps. The clamps are operated by the oscillation of the traction lever 5 through a crank 4 and two pairs of parallel correcting rods, rods 9 controlling clamp B and rods 10 controlling clamp A. The shafts 13a pass through elongated openings formed in the connecting rods 9. Each clamp comprises a U-shaped jaw 11 and a co-operating, vertically movable jaw 12 which receives the clamping pressure of a pair of cams 13. The oscillatory movement of cable gripping and of traction of the load is transmitted to the cams 13 of each clamp by two pairs of short levers, of which one, 14, is double-acting, having an upper extension 14a, and the other, 15, is single-acting. The cams 13 engage directly in appropriately shaped openings of the levers 14, 15. Each pair of connecting rods 9, 10 is joined to two pairs of levers 14, 15 by two articulation axles 19, 20. The axle 20, placed to the rear of the axle 19, is movably mounted in openings cut in the flanks of the connecting rods of each pair to provide a movement in the form of an arc, centred on the axle 19. On the movable axle 20 is articulated the pair of levers of each clamp the nearest to the crank 4, i.e. the pair 14 for the clamp B and the pair 15 for the clamp A. The jaws 12 (Fig. 5) are formed in two parts, the upper part having a female dovetail for engaging a counterpart male dovetail on the lower part or slipper driver 12a. The driver 12a is in soft or austenitic steel for the easy control and non-slipping of the cable, while the upper part of the jaw is made of steel of high resistance. The upper extensions 14a of the pairs of levers 14 of each of the clamps A, B are joined by a shaft 22 providing a driving axle for the levers 14a, for the purpose of release, and carrying and guiding a pair of parallel supports 24 having two longitudinal openings 24a, 24b which are traversed by the shafts 22. The central parts of the two supports 24 are connected by a shaft 25 on which oscillates in the space between the supports the lever 26 controlling the cable release movement of the device. Two shafts 27, 28 are symmetrically arranged on the lever 26 with respect to the shaft 25, these shafts 27, 28 being driving members for two pairs of links, viz. links 29 connected to the top levers 14a of the clamp A and links 30 connected to the top levers 14a of the clamp B. A handle 34 is provided, permitting easy carrying of the device and, by pivoting on a hinge pin 34b, constituting a powerful opening lever for simultaneous opening of the two pairs of jaws of the clamps A, B for the easy introduction between the jaws of the traction cable of the load.