GB256916A - Improvements in capstans or winches - Google Patents

Abstract

256,916. Leroux, P. E. Aug. 11, 1925, [Convention date]. Capstans; winches; driving-gear; tensionregulating.-A winch or capstan is driven by a motor either at a relatively high speed through gears or at various lower speeds proportioned one to the other in two different directions by a reciprocating motion which is transformed into motion through a circular arc, the length of which can be determined at will. The motor 5, Fig. 3, drives a vertical shaft 11 through double reduction worm gearing. A gear B loosely mounted on the shaft 11 can be connected thereto by a clutch 15, the actuating rod of which extends through the top of the casing. The gear 13 engages a gear 21 formed integral with the conical drum 22, Fig. 4, the hub 23 of which carries a ring 24 turning on a hollow vertical shaft 25 containing lubricating oil. The winding drum 28 is kept in place on the cone 22 by a nut 30 acting through a ball bearing 31. The upper part of the drum forms a brake pulley 34 on which acts a brake band 103. A crank pin 37 on the worm wheel 10 is connected by a rod 38, Fig. 6, to a pivoted member 40 carrying opposed pawls 42, 43 which engage ratchet wheels 44, 45 having opposed teeth keyed to the shaft 46. A pinion 47 on the lower end of the shaft gears with a toothed wheel 21 formed integral with the cone 22. A vertical shaft 48 which can be turned from outside the casing carries a gear 50 engaging a toothed sector 51 which turns freely on the hub of the ratchet wheels 44, 45 and is integral with a member forming screens 52, 53. These screens can be placed between the teeth of the ratchets and the pawls 42, 43, and also two opposeed retaining pawls. A gear 64, Fig. 12, on the shaft 48 engages a rack 65, the rod 66 of which is constrained to move horizontally and works through an arm 68 integral with the fork of the, clutch 15. When the clutch is disengaged, the rod can pass freely through a circular aperture in the arm, but when the clutch is engaged, a reduced part of the rod is engaged by a narrow passage in the arm, and the movement of the rod is prevented. In this position of the rod, the screens are between the pawls and ratchets, and rotation of the shaft 46 cannot take place. The cable 73 passes round one of the guide rollers 71, 72 which are carried on hollow axles 74, Fig. 11, forming oil reservoirs and having elongated bases 76 slidable in slots 77 in the base. The bases are separated by a spring 79, the tension of which can be regulated. Pivoted levers 84, 85 connect the bases to rods 88, 89 having pin-and-slot connections with a bell-crank lever on a shaft controlling a valve in the supply pipe of the motor. As soon as the tension of the cable becomes abnormal, the distance between the rollers 71, 72 decreases, and the valve closes. The edges 2 of the base are bent up to facilitate the dragging of the machine over the ground. Alternatively the machine may be mounted on wheels.