GB655450A - Improvements in or relating to hoisting or haulage gear - Google Patents

Abstract

655,450. Winding and paying-out apparatus. HOPKINSON, A. June 8, 1949, No. 15226. [Class 78 (v)] In winding and paying-out apparatus of the type comprising one or more winding drums mounted on a cylindrical casing within which the driving unit is mounted, the transmission gearing between the driving unit and the or each drum includes a friction clutch which is coaxial with the drum and operated by an annular coaxial piston working within a fixed annular hydraulic cylinder to which hydraulic pressure is admitted to cause engagement of the clutch, so that the piston rotates within the cylinder when driving the drum. The prime mover B is fixed within a cylindrical casing A<1>, which is sectioned for assembly, and which supports two drums C, C<1>. The outer flange of each drum has an axially extending flange C<3> to which are splined driven clutch plates D, interposed between driving clutch plates D<1>, which are splined to the hub E of a gear-wheel El. Each gear El meshes with a pinion K on an idler shaft K<1> which also mounts a gear-wheel K<2>, in turn meshing with an idler gear L on a pin N, which meshes with a gear M secured by means of an internally splined sleeve M<1> on the shaft B<1> of the prime mover. Pin N is eccentrically carried by a cylindrical block N<1> which is rotatable in a housing in the casing A<1> and is provided with a pin N<2> engageable in two holes N<3> so as to retain pin N at one of two distances from gear M. Thus by changing the sizes of gears M and L and the position of pin N a change of gear ratio is effected. The annular piston G is normally pressed into annular cylinder F by springs G<1> mounted between the piston and gear-wheel E<1> and around pins H, which pins couple the piston to rotate with gear El and also transmit the movement of the piston G through holes in gear El to the clutch plates. When fluid pressure is admitted at J, the clutch plates D and D<1> are pressed into engagement.