Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1996-10-03
1998-06-23
Brittain, James R.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
246001, 246015, F16G 1508
Patent
active
057694753
ABSTRACT:
An improved shackle apparatus that introduces improvements to the basic shackle design to allow for easy release under load, a high strength to weight ratio, and low wear on sliding surfaces. Easier release under heavy load is accomplished with a nonsymmetrical trigger hole design. The contour of the trigger hole pushes the fid to the side of the trigger, thus producing greater leverage on the trigger that would have been applied with the same amount of force as originally applied to the fid. Internal design of the improved shackle apparatus has incorporated the trigger spring in the shank resulting in a simplified design while providing for a high strength to weight ratio. Likewise, a reinforced trigger pivot pin hole improves tensile strength and increases the bearing contact area of the trigger. Low wear on sliding surfaces is aided by a new "cam action" hook design that allows the rope to roll over the hook area instead of sliding. As the hook completely opens, the offset distance of the "cam action" design decreases until the hook and the shackle casing meet in a smooth transition.
REFERENCES:
patent: 1233376 (1917-07-01), Link
patent: 3930290 (1976-01-01), Mangels
patent: 4093293 (1978-06-01), Hugget
patent: 4279062 (1981-07-01), Boissonnet
Brittain James R.
Persson Michael J.
Ritchie William B.
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