Rotatable load clamp adapted for selective load positioning in r

Details Rotatable load clamp adapted for selective load positioning in r Rotatable load clamp adapted for selective load positioning in r

1978-03-22

1979-12-04

Werner, Frank E.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Grab

91512, 414911, B66C 142

Patent

active

041770005

ABSTRACT:
A selectively rotatable load clamp for lift trucks, having a pair of openable and closable clamp arms. The clamp arms are capable of shifting the position of a load relative to the lift truck by movement of the clamp arms in unison, by which the load may be moved relative to the lift truck between a position of equal extension, wherein the forward ends of the clamp arms extend a substantially equal distance forwardly of the lift truck, and a position of unequal extension wherein the forward end of one clamp arm extends a greater distance forwardly than the forward end of the other clamp arm. The fluid motor apparatus for accomplishing such shifting function is selectively actuatable only in certain predetermined rotation positions of the clamp, that is, those positions where the two clamp arms are disposed at substantially a 45.degree. angle relative to horizontal. A valve assembly responsive to the rotational position of the clamp permits the selective actuation of the shifting function in such position, while preventing the selective opening or closing of the clamp arms. Conversely, when the clamp arms are placed either one above the other or side-by-side, the selective opening or closing of the arms is permitted while the actuation of the shifting function is prevented.

REFERENCES:
patent: 2754018 (1956-07-01), Schroeder
patent: 3179274 (1965-04-01), Comfort
patent: 3395732 (1968-08-01), Comfort
patent: 3623620 (1971-11-01), Vermette
patent: 3896957 (1975-07-01), Sinclair
"Operators and Owners Guide-Paper Roll Clamps", Published by Cascade Corporation of Portland, Oregon-p. 6.
"Slide #1.08" from Service Training-Pivot Arm Paper Roll Clamps, Published by Cascade Corporation of Portland, Oregon.

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