Clutch mechanism for hoisting apparatuses
AssigneeElkem a/s
InventorJohannes Sandvik
Life of this patent
Estimating the term…
Abstract
The drum of a hoisting apparatus is axially shifted to frictionally engage a driving plate. The drum is shifted by rotating an adjacent, first disc about the drum axis relative to a coaxial stationary disc. Each of the discs has three holes of a particular configuration to define three cooperative pairs of holes. Each cooperative pair of holes receives a dowel of predetermined length so that rotation of the first disc causes the dowel to react against the discs and shift the first disc and drum away from the stationary disc and into frictional driving engagement with the driving plate.
Claims9
Clutch mechanism for hoisting apparatuses comprising:
- (a) a driven plate;
- (b) a drum having opposed end plates, one said end plate being moveable into and out of engagement with said driven plate;
- (c) a first disc having one side acting upon the other said end plate of said drum;
- (d) the other side of said first disc having a generally planar surface;
- (e) a second disc, said second disc having a generally planar surface which faces the planar surface of the first disc;
- (f) at least three holes in the planar surface of each said disc, each said hole in the planar surface of said first disc opposing one hole of said second disc to form opposed pairs;
- (g) each said at least three holes having one sidewall which is substantially perpendicular with respect to the planar surface and a second opposed sidewall oblique to the planar surface;
- (h) a dowel in each said opposed pair of holes, said dowel having a length greater than the combined lengths of the perpendicular sidewalls of the opposed pair of holes;
- (i) said discs having a first position wherein the dowels are positioned towards oblique walls of the holes and a second position wherein the opposed dowels are positioned towards the perpendicular walls of the holes;
- (j) said discs being movable from said first position to said second position by relative rotation thereof;
- (k) said one said end plate of said drum being in positive engagement with said driven plate when said discs are in said first position;
- and
- (l) said one said end plate being out of positive engagement with said driven plate when said discs are in said second position.
Dependencies are inferred from the claim text.