Patent GB-452872-A (GB)
Title: Improvements in and relating to pulley block tackle for supporting deep boring appliances
IPC: B66D3/06
Filed: 1935-03-06
Abstract: 452,872. Pulley-blocks for supporting deep-boring appliances. MULLER, F., 170, Lainzerstrasae, Vienna. March 6, 1935, No. 7085. Convention date, March 6, 1934. [Class 78 (v)] Pulley-blocks for deep wellboring are designed to prevent twisting of the fall ropes due to the rotation of the boring tool. In general, the pulleys of the lower or hanging block are arranged in pairs, the pair nearer to the longitudinal axis of the block being as far apart as possible and as near as possible to the pair or pairs more remote from the axis. while the pulleys of the upper or crown block may be staggered in height, and be inclined in relation to the pulleys of the hanging block. Figs. 2 and 5 show a completely-encased lower block having four pulleys 3 mounted on roller-bearings and arranged along the four sides of a rectangle. The two pulleys that are parallel to the longer or longitudinal axis of the block are set as far apart as possible, but are nearer together than the other pair. The peripheries of both pairs are close together, as shown, so that the ropes hang close together. The two fall ropes from any pulley 3 of the movable block when hanging vertically, are tangential to two separate pulleys of the companion fixed block. The eyed rod 10, Fig. 2, which supports the boring tool, is fitted with a spring 15 and spring buffer 18. The spring 15 is stated to raise each length of boring rod, when it is unscrewed, sufficiently to permit of its removal without employing special raising means to give it an additional lift. In a modified construction the whole pulleyblock is made from wrought steel, with a sheetmetal casing. Several modifications of the fitting carrying the axles for the four pulleys and of the central pin with the spring-mounting and the buffer are described. Fig. 10 shows a modification in which the four pulleys 58 are all parallel but one pair is spaced differently from and is higher than the other pair. Fig. 15 shows a construction with four pulleys 75 all on one shaft, a leaf buffer spring 88, which may also act as a weighing-device, and a pair of springs 93 supporting the roller-mounted hook 90 through a universal joint 91. In a modification of this last construction, the load hook is supported by a single spring as in Fig. 2. Fig. 21 shows diagrammatically the reeving of the ropes in a pulley system comprising a lower block with four pulleys 125 arranged along the sides of a rectangle, and an upper block with four pulleys 126 on a common shaft and a central inclined pulley 127. Complete blocks with this arrangement of ropes are also described and illustrated, in one case with the pulleys enclosed and in the other case with them exposed. In another modification, which is illustrated both diagrammatically and constructionally, all the pulleys in the top block are placed obliquely. Fig. 37 shows a triangular supporting frame for the pulleys of the upper block, all of which are mounted so that they can be set angularly, and some are supported from above and others from below, as shown. Lubricating passages and chambers. In Fig. 2 a wick 21 drawing from the reservoir 19 delivers through the curved tube 22 to bores in the axles 4 leading to the bearings. In Fig. 7 (not shown), a reservoir 40 feeds through passages 41 by gravity. In Fig. 13 (not shown) the chamber 64 may act as a reservoir supplying the axles 63 through suitable passages. In Fig. 16 (not shown), two reservoirs 82, 83 are formed in the casing, of which 82 delivers to the bearings by a wick 84, and 83 delivers to the pulleys and ropes by a pump (not shown). Gauge glasses 85, 86 show the liquid level in the reservoirs. In Fig. 20 (not shown), two main reservoirs are provided, 118 for the pulleys and ropes, and 122 for the bearings. The reservoir 118 communicates with the smaller reservoirs 119, 120 and 121. In Fig. 27 (not shown), the reservoir 153 furnished with gauge-glass 154 feeds the pulleys and ropes through the pump 155 operated by a flat on the rim of the pulley 142. A second higher reservoir 157 feeds the bearings by gravity.