GB1291034A - Winches - Google Patents

Abstract

1291034 Winches BARIENT CO 12 Jan 1971 1546/71 Heading B8B A three-speed winch includes internal gearing driven through ratchet gearing whereby rotation of the drive-shaft 36 in opposite directions provides two different speeds for the winch drum whilst an operating handle for the shaft 36 is turnable relative to the drum once a pawl 100 mounted on the drum is pivoted into a recess therein, the third speed being provided when the handle engages the pawl 100 in its projecting position and the drum rotates at the same speed as the handle. The pawl 100 of bell-crank form is spring-biased into either of its two positions by an over-centre cam profile thereon, the direct drive from handle to drum being effected by handle rotation in one direction and a second drum speed being effected by handle rotation in the other direction wherein the pawl 100 is depressed and the shaft 36 drives a ring-gear 98 of the drum through a pawl carrier 44, ratchet gear 50 and gear 76 on a further pawl carrier 74. The pawls on the latter freewheel relative to a ratchet-wheel 82 in this direction of rotation. The third drum speed is effected by rotation of the handle in the original direction, with the pawl 100 still depressed, whereby the shaft 36 drives the ratchet gear 82 through a pinion 46 and an interposing idler gear, the gear 82 driving the gear 76 and drum through the pawls on the carrier 74 whilst the pawls on the carrier 44 free-wheel. The pawl 100 must be manually moved into its projecting position. Various embodiments are described for alternative forms of operating pawl between the drum and handle, wherein the pawl may be positioned either on the drum or handle. In the embodiment of Figs. 13-16 (not shown), a profiled disc is secured to the shaft adjacent the pawl supporting end of the drum and the shaft is driven from the opposite end by a chain and remote turning gear.