Metal deforming – With means to handle work or product – By gripper and/or endless chain
Patent
1982-08-18
1984-07-03
Larson, Lowell A.
Metal deforming
With means to handle work or product
By gripper and/or endless chain
72705, 24134P, 269234, 294116, B21D 112
Patent
active
044571593
ABSTRACT:
A pair of elongated clamp levers are provided and interconnected intermediate their opposite ends for substantially coplanar relative oscillation of the levers to inversely swing corresponding pairs of ends of the levers toward and away from each other. One pair of lever ends defines opposing jaw ends between which a sheet metal marginal portion may be clamped and a wedge assembly is moveably connected between the other pair of ends of the levers and includes operating structure moveable lengthwise of the levers and to which one end of an elongated pull member may be anchored. The wedge assembly, when the operating structure is displaced away from the jaw ends of the levers, is operative to spread the other pair of ends of the levers apart, the operating structure being effective to apply a high wedging force-to-pull force ratio during initial movement of the operating structure away from the jaw ends of the levers and to progressively diminish the aforementioned ratio as the operating structure is displaced further away from the jaw ends of the levers.
REFERENCES:
patent: 902795 (1908-11-01), Appleton
patent: 2989337 (1961-06-01), Pispisa
patent: 3355777 (1967-12-01), Mojelski
patent: 3744838 (1973-07-01), Jackson
patent: 3879814 (1975-04-01), Mojelski
patent: 3955249 (1976-05-01), Shiozaki
patent: 3986746 (1976-10-01), Chartier
patent: 4037456 (1977-07-01), Jarman
patent: 4148210 (1979-04-01), Bjork
Hinson Virgil H.
Jarman Davis R.
Jacobson Harvey B.
Larson Lowell A.
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