Lifting tongs

Details Lifting tongs Lifting tongs

1984-01-19

1985-07-23

Marbert, James B.

Handling: hand and hoist-line implements

Grapple

Pivoted jaws

294 864, B66C 142

Patent

active

045305366

ABSTRACT:
Lifting tongs for a crane include a pair of tong arms pivoted together adjacent their centers. A tension spring biases the tongs into a closed position and a pneumatic cylinder moves the tongs opened and closed. A pair of jaws are mounted to the lower ends of the tong arms. Each jaw includes a substantially horizontal slot and a vertical wall extends upwardly from the opening at the mouth of the slot. As the jaws are closing, the vertical walls guide the edges of the article to be lifted into the slots. Movable shims within the slots adjust the height of the slots so that the tongs can be used to lift articles of different sizes.

REFERENCES:
patent: 3948552 (1976-04-01), Hamrick

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