Clamping assembly for lifting heavy objects having a bulbous eng

Details Clamping assembly for lifting heavy objects having a bulbous eng Clamping assembly for lifting heavy objects having a bulbous eng

1980-11-13

1983-09-20

Marbert, James B.

Handling: hand and hoist-line implements

Grapple

Fixed and moveable jaw

294 88, B66C 142

Patent

active

044051689

ABSTRACT:
The clamping assembly includes a pair of clamping arms extending outwardly from a clamp base portion. Each arm includes a cutaway portion to receive the bulbous engagement portion of the article to be lifted and a front gripping portion to engage and grip a non-bulbous, preferably generally flat portion of the article. At least one arm is movable and is pivotably mounted about the base portion for movement between a clamping position in which the gripping portion of the arm engages and grips the non-bulbous portion of the article to be lifted, and an open position wherein the gripping portion of the movable arm is located away from the gripping portion of the other arm to allow entry or removal of the article. The base portion is pivotably mounted about a clamp support whereby the assembly may be used either vertically or horizontally. The clamp support includes means to support the clamp assembly by means of cables extending from an overhead crane. Drive means such as an electric motor is mounted on the base portion to move the movable arm(s) between closed and open position. Limit switch means are provided which turn off the drive means when the movable arm(s) has reached the open and closed positions. Safety means are provided whereby power to close the clamp cannot be activated unless the bulbous portion of the article to be lifted is in place within the cutaway portions of the arms. Additional safety means are provided in the crane support whereby the movable arm(s) cannot be moved from closed to open position so long as a predetermined weight is being carried by the clamp assembly.

REFERENCES:
patent: 2910321 (1959-10-01), Sehn et al.
patent: 3153555 (1964-10-01), Kaplan et al.
patent: 3792782 (1974-02-01), Melton
patent: 4236744 (1980-12-01), Reinders
patent: 4256429 (1981-03-01), Dwyer

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