Handling: hand and hoist-line implements – Article carrier gripped and carried by hand – Convertible to – or useable as – different device or different...
Patent
1974-04-08
1976-02-17
Sheridan, Robert G.
Handling: hand and hoist-line implements
Article carrier gripped and carried by hand
Convertible to, or useable as, different device or different...
294107, B66C 304
Patent
active
039386813
ABSTRACT:
A vertically swingable boom is provided with a downwardly opening grappling fork having horizontally swingable tines that are operated in unison by mechanism reciprocable vertically across the outer end of the boom. Power is supplied to the mechanism via a vertically swingable rocker and a fluid pressure piston and cylinder assembly lying along the boom and having a ram coupled with the rocker that reciprocates toward and away from the fork. Special geometrical and tolerance relationships between the tines and the plunger mechanism permit certain of the tines to move more deeply into the grappled load than others if disproportionate resistances are encountered, all without subjecting the fork, the connecting mechanism, and the ram to excessive bending forces.
REFERENCES:
patent: 839479 (1906-12-01), Howe
patent: 2474374 (1949-06-01), Shattuck
patent: 3055521 (1962-09-01), Crampton
patent: 3777918 (1973-12-01), Barber
Bennett Max E.
Clark William H.
Lawson Gordon L.
McCanse James Edson
Abraham George F.
Hesston Corporation
Sheridan Robert G.
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