Attachment for groundworking and material handling machines and

Details Attachment for groundworking and material handling machines and Attachment for groundworking and material handling machines and

1998-08-25

2000-09-19

Underwood, Donald W.

Material or article handling

Vertically swinging load support

Grab

37403, 91437, 414727, B66C 100

Patent

active

061202371

ABSTRACT:
An attachment connectable to a boom member of a machine for performing work functions generally consisting of a handle pivotally connectable to a boom member of the machine, a ground engageable arm member pivotally connected to the handle and an extendable strut assembly interconnecting the handle and arm member consisting of a hydraulic cylinder assembly having a cylinder member pivotally connected to the handle and a rod member pivotally connected to the arm member, and including means intercommunicating the base and rod ends of the cylinder member, at least one electrically operable valve disposed in the intercommunicating means and operatively connectable to control means disposed on the machine, selectively operable to open the valve and permit the free flow of fluid between the base and rod ends of the cylinder member, and correspondingly the angular displacement of the arm member relative to the handle upon maneuvering the arm member by an operator of the machine, and to close and preclude the free flow of fluid between the base and rod ends of the cylinder member, and correspondingly the angular displacement of the arm member relative to the handle, and an accumulator selectively communicable with the variable volume chambers of the cylinder for compensating for the fluid volume differential of such chambers.

REFERENCES:
patent: 4375345 (1983-03-01), Hanson
patent: 4840111 (1989-06-01), Garnjost
patent: 5553408 (1996-09-01), Townsend
patent: 5678332 (1997-10-01), Hawkins

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