Handling: hand and hoist-line implements – Grapple – Fixed and moveable jaw
Patent
1993-03-25
1995-07-18
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Fixed and moveable jaw
414608, B66C 144, B66F 900
Patent
active
054334934
ABSTRACT:
Apparatus are disclosed for securing an implement to a rigid longitudinally extended lifting member. A representative embodiment comprises a clamp that can be mounted to a forklift implement and/or socket for receiving a lifting member. A working surface engages the lifting surface of the lifting member. A cam is pivotably mounted on an axis transverse to and displaced from the working surface. The cam has an outwardly radiating spiraled engagement lobe that presses against the under-surface of the lifting member so as to press the lifting member between the working surface and the cam. Thus, the cam allows the clamp to be moved rearwardly but not forwardly on the lifting member. The cam, which is biased, can be characterized by having a fixed axis, being self-locking, and/or having a constant contact angle with the underside of the lifting member. The cam can also have a release lobe adapted to engage a reference surface for releasing the engagement lobe from the lifting member whenever the clamp is placed upright on the reference surface. The clamp can have multiple cams either similarly or differently sized. Differently sized cams allow the clamp to engage a wider range of lifting-member thicknesses than single-cam clamps.
REFERENCES:
patent: 2654629 (1953-10-01), Renfroe
patent: 3003806 (1961-10-01), Shramek
patent: 3101128 (1963-08-01), Dane
patent: 3189377 (1965-06-01), Gardner
patent: 3336068 (1967-08-01), Renfroe
patent: 3593672 (1971-07-01), Breen et al.
patent: 3889833 (1975-06-01), Thomas
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patent: 5096018 (1992-03-01), Dickinson, Jr.
Miller, "Inventor's Corner," Wire Rope News and Sling Technology, Jun., 1990, pp. 31-32 (summarizing U.S. Pat. No. 4,884,836).
Miller, "Inventor's Corner," Wire Rope News and Sling Technology, Dec., 1992, p. 42 (summarizing U.S. Pat. No. 5,133,111).
Window Clamping Mechanism (photographs of clamping mechanism encountered in a residence; manufacturer of mechanism unknown).
Product Catalog, Renfroe.RTM. Lifting Clamps (1990).
Dix Mark J.
Lanfrankie Joseph H.
Lund Worm
Cherry Johnny D.
Lifting Technologies, Inc.
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