Gravity-steered grapple

Details Gravity-steered grapple Gravity-steered grapple

1992-03-26

1993-09-14

Huppert, Michael S.

Material or article handling

Vertically swinging load support

Grab

294104, B66C 162

Patent

active

052443388

ABSTRACT:
A gravity-steered grapple is created by retrofiting the boom plate of an excavator which has a longitudinally rotatable boom. The grapple includes a freely-turning, swivel joint with an axis of rotation which is offset from the center of the grapple jaws so that the center of mass of the load is likewise offset. By manipulating the angle of the boom plate with existing operator controls, the load can be steered about the swivel joint controllably through a horizontal 360-degree angle. The grapple also includes a jaw safety clamp which is movable between lock and release positions. The clamp is self-actuating and is moved into the lock position when an extension of the clamp contacts the load as the grapple is raised. The grapple is particularly useful in lifting and placing modular highway barriers.

REFERENCES:
patent: 1814107 (1931-07-01), Zavatkay
patent: 2435549 (1948-02-01), Sumter
patent: 3599814 (1971-08-01), Brownfield
patent: 4451194 (1984-05-01), Keats et al.

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