GB1353607A - Geared hoist - Google Patents

Abstract

1353607 Hoist winches JOSEPH LUCAS (INDUSTRIES) Ltd 3 Sept 1971 [5 June 1970] 27201/70 Heading B8B [Also in Division F2] A hoist comprises a cable drum 11 driven from a shaft 14 through two epicyclic gear trains and a threaded slipping clutch arrangement 19, 26 such that upon driving the shaft 14 in the cable winding in direction, friction plates 29, 31 of the clutch are screwed into interengagement, and upon reversing the shaft 14, the clutch plates are released permitting slipping and allowing the load on the cable to rotate the drum in the cable paying out direction, an overrun clutch 38 tending to re-engage the clutch plates if the drum overruns the shaft 14. The first epicyclic gear train comprises a sun wheel 15 on the drive shaft 14, planet wheels 16 on a carrier 17 integral with the threaded part 19 and a ring gear 18 engageable with the planets and secured to a stationary structure. The second epicyclic gear train comprises a sun gear 27 integral with the threaded part 26, planets 33 on a carrier 34 integral with the drum 11, and a ring gear 35 engageable with the planets and secured to the other ring gear 18. The threaded clutch arrangement comprises friction pads 29 associated with a flange 28 on the threaded part 26 and a sliding flange 23 splined to the threaded part 19, a friction disc 31 compressible between the two pads 29 and secured to a carrier 32, and a spring 37 maintaining a pre-set compression on the clutch components. The overrun clutch 38 between the disc carrier 32 and the planet carrier 34 permits the carrier 32 to run faster than the carrier 34 during winding in operations, but locks the two carriers together when the drum rotates to pay out cable and the friction plates 29, 31 are slipping. Both ends of the drum 11 are sealed so that the drum may contain lubricating oil.