Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1976-12-28
1982-12-28
Bertsch, Richard A.
Material or article handling
Vertically swinging load support
Shovel or fork type
182 2, 212259, 414694, B66C 124
Patent
active
043659268
ABSTRACT:
The use of a lift fork for a boom swinging vertically over 240.degree. is made feasible by hanging the lift fork with freedom to pivot as gravity dictates when the angularity of the boom is changed, with a brake by which the angularity between boom and lift fork can be locked. The brake enables the boom to exert a strong forward thrust on the bottom of the lift fork when this is necessary for thrusting its tines under a load, and has other advantages. Proper positioning of the load on the forks will cause the forks to hang with the tines of the forks nearly level, or slightly tilted back if preferred. Prefably the fork-lift device also hangs conveniently close to this position when empty. Material handling programs which heretofore needed not only a crane operator but a crew for attaching the hoist line to the load and removing it, can be performed by the operator alone if the swinging but lockable lift fork is used with a three-part "reach anywhere" articulated boom on a swinging crane.
REFERENCES:
patent: 3043394 (1962-07-01), Holl
patent: 3196979 (1965-07-01), Garnett
patent: 3411606 (1968-11-01), Oldakowski et al.
patent: 3498474 (1970-03-01), Pierce, Jr.
patent: 3908843 (1975-09-01), Noller et al.
Bertsch Richard A.
Pettibone Corporation
Robertson Louis
Weaver Ross
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