GB240357A - Improvements in and relating to clutches for connecting and disconnecting power transmission shafts - Google Patents

Abstract

240,357. Hunt, W. Feb. 20, 1925. Clutches, friction. - The main expanding or contracting clutch coil of the centrifugally-controlled friction clutch described in Specification 208,363 is replaced by a pair of expanding or contracting shoes. In the expanding-shoe clutch shown arcuate, shoes b<1>, b<2> are pivotally connected at j<1>, j<2> to arms d<1>, d<2> loose on the driven shaft y, and at k<1>, k<2> to plates p<1>, p<2> which are hinged on the shaft y and normally held by springs n<1> n<2> somewhat inclined from the radial position towards the arms d<1>, d<2> respectively. Extensions of the arms d<1>, d<2> are connected to a loose drum c, which is acted on by centrifugally controlled shoes carried by a driving-member (not shown), as in the Specification above referred to, or by an expanding or contracting band or other centrifugally operated clutch member. On engagement of the auxiliary clutch, the arms d<1>, d<2> are advanced and, due to the resistance of the driven shaft, the plates p<1>, p<2> turned into a. more nearly radial position until arrested by adjustable pins (not shown) carried by a member on the shaft y. The shoes b<1>, b<2> then engage a driving-drum (not shown) which may have an adjustable inner lining. Such lining may, however, be carried by any form of framework in place of the drum. Specification 215,560 also is referred to.