Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Load releasing means
Patent
1988-04-05
1989-03-07
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Load releasing means
294 8232, 294 8234, B63B 2300, B66C 134
Patent
active
048100170
ABSTRACT:
The safety clutch includes a first tubular part (1), a second tubular part (13) and a plurality of locking members (5) co-operating with the parts in such a manner as to establish therebetween a releasable connection. The locking members (5) have inclined abutting surfaces (11) orientated so that the engagement between the surfaces and a corresponding abutting surface (12) on the second part (13) exerts a radially outward force on the locking members (5). The force is transmitted over axially parallel locking surfaces (16) to a corresponding locking surface (19) on an encircling locking ring (18) which in the locked position of the clutch mechanically prevents the locking members (5) from disengaging the second part (13). The releasing force of the clutch is thus closely associated with the frictional force existing between the locking surface (16 and 19) and which in practice may have any desired value. A spring-biassed and axially displaceable release ring (25) for releasing the clutch is arranged around the locking ring (18 ). Dependent upon the allowed axial displacement of the release ring (25) it is obtained that the force transmitted to the locking ring is either equal to the force of the inserted spring or is directly equal to the force exerted on the release ring (25). This opens up the prospect of obtaining in a simple manner a safe release of the clutch in the off-load case as well as in the on-load case.
REFERENCES:
patent: 1027481 (1912-05-01), Huff
patent: 2941835 (1980-06-01), Musser
patent: 3081122 (1963-03-01), Jungersen
patent: 3240520 (1966-03-01), Dailey et al.
patent: 3810671 (1974-05-01), Jeffery
patent: 4258888 (1981-03-01), Sawn
Knak Torben
Ludvig Naess
Cherry Johnny D.
Norpol Technic A/S
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