Grapple or grab-bucket safety mechanism

Details Grapple or grab-bucket safety mechanism Grapple or grab-bucket safety mechanism

1978-04-20

1979-12-11

Cherry, Johnny D.

Handling: hand and hoist-line implements

Hoist-line slings

Latch release

37187, 294 88, B66C 316

Patent

active

041780302

ABSTRACT:
The invention contemplates an improved grapple or grab-bucket construction of the double-acting hydraulically activated variety, wherein the normal bucket-open position is determined by a stiffly yieldable abutment which yields to permit a short further energy-absorbing bucket-opening displacement in the presence of the mechanical shock encountered upon dropping the open grab bucket onto a relatively hard base to be excavated. The short further shock-induced displacement elevates hydraulic pressure in the actuation system, which elevated pressure is vented by a relief valve in common with the hydraulic actuators of all buckets in the grapple.

REFERENCES:
patent: 1055425 (1913-03-01), Smith
patent: 1096214 (1914-05-01), Andersen
patent: 1153950 (1915-09-01), Peterson
patent: 1231779 (1917-07-01), Norris
patent: 2877575 (1959-03-01), Stedt
patent: 3194329 (1965-07-01), Wallers

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