B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
294/15
B66C 1/00 (2006.01) B66C 1/48 (2006.01)
Patent
CA 1228095
NON-MARKING LIFTING CLAMPS ABSTRACT A non-marring lifting clamp for articles such as metal plates has a pair of opposed jaws mounted on opposite sides of a slot formed in the side plates of the clamp body with one of the jaws being pivotally mounted for opening and closing movements relative to the other jaw, and a lifting shackle being mounted for guided movement in the clamp body. A linkage assembly in the body couples the shackle to the pivotally mounted gripping jaw to urge the gripping jaw toward the other jaw when a lifting force is applied to the shackle. The linkage assembly includes a swing link connected to move the gripping jaw and a control link pivoted to the clamp body with a connecting mechanism coupling the control link both to the shackle and to the swing link. A manually operated pivotally mounted handle accessible exteriorly of the clamp body operates a locking mechanism which includes a coil spring associated with the control link, this spring acting on such con- trol link and being tensioned or released by operation of the handle. The locking mechanism includes a cam link mechanism connected to be shifted by handle movements, the cam link mechanism cooperating through the coil spring with the control link to bias the control link alternately to the jaw closing position or jaw open position. The cam link means also provides a limiting stop acting on the control link to retain it alternately in jaw open position or jaw closing position while still allowing limited opening movement of the jaws by overcoming the biasing force of the tensioned coil spring. The lifting clamp further has the other jaw carried on a manually adjustable wedge with visually observable indicia associated with this other jaw and also with the gripping jaw for the operator to visually determine the clamp's suits- bility in handling a particular size plate to be lifted.
456503
Davies William
Renfroe Charles J.
Renfroe (j. C.) And Sons Inc.
Sim & Mcburney
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