Patent GB-891145-A (GB)
Title: Improvements in winches
Inventor: TUPLIN WILLIAM ALFRED
IPC: B66D1/74
Filed: 1958-09-26
Abstract: 891,145. Winch for mounting on vehicle. RUBERY OWEN & CO. Ltd. Sept. 25, 1959 [Sept. 26, 1958], No. 30771/58. Class 78 (5). A vehicle winch (Fig. 1) employs both a heavy cable and a light cable. The heavy cable 12 is driven by being passed round and between driven capstan drums 10, 11 and then guided on to driven storage drum 13 by reciprocating arm 29. The light cable 26 is fed by reciprocating pulley 27 on to driven auxiliary drum 25. The drive to the drums comes from the vehicle engine via input shaft 16, flexible coupling 17 and gear box 18. Drive to capstan 10 (or 11) (Figs. 5, 6).- Drum 10 is an annulus carried on fixed nut 93 by roller bearings 109 and is driven from driving shaft 61 via double epicyclic gearing 85 and gearing 78-102. Thus, the drive from shaft 61 proceeds to drum 10 via sun wheel 64, planet wheels 67 on carrier 65 splined to shaft 66, annulus 68 rigid with sun wheel 71, planet wheels 73 on carrier 72 splined to shaft 66 and controlled by annulus 74, shaft 66, gearing 78, 79, 81, 91, 92, 99, shaft 100, gearing 101, 102, and ring gear 103 secured to the drum 10. The drum is driven in the hoisting direction by application of band 69, bands 77 and 84 being simultaneously applied but being rendered inoperative bv their respective free wheels 75 and 83. Band 84 at the same time prevents any back rotation under the load. To permit lowering under the weight of the load, bands 69 and 84 are released whilst band 77 is applied. Drive to storage drum 13 (Figs. 7 and 8).- From shaft 100 (see above) the drive passes to drum 13 via shaft 100, gear 111, shaft 112, sprocket 113, sprocket 114, shaft 115, alternative gearing 116-118 or 117-119, shaft 121, sprocket 124, sprocket 125, shaft 126, and slipping clutch 200. Clutch 200 is formed of plates 127, 129 urged by movable discs 133 which are pressed by springs 134, 135 against stationary discs 132 (of which one is adjustable at 136). Gears 118 and 119 are coupled to shaft 121 by respective freewheels 123 and 122, the freewheels operating in opposed senses so that changing from hoisting to lowering involves an automatic gear change. The gear ratios are chosen such that, when winching in, the minimum slip of the clutch occurs when the drum is empty of cable, and, when winching out, the minimum slip of the clutch occurs when the drum is full of cable. This ensures evenness of cable tension between storage drum and capstans. Drive to auxiliary drum 25 (Figs. 9, 10).-The drive from shaft 63 to drum 25 passes via sun wheel 151, planet wheels 152 on carrier 155, shaft 156, sprocket 161, sprocket 162, gear 164, gears 165, and ring gear 166 secured to the drums. When band 154 is applied to the epicyclic gear, the drum is driven in the winching-in direction, band 159 being simultaneously applied, but, due to freewheel 158, being effective only to prevent back fall of load. Cable tension control.-Each gear-case is rotationally mounted and the reaction torque is converted into hydraulic pressure. The tension of each cable is thus recorded and if excessive operates an alarm or interrupts the drive.