Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1987-07-02
1989-04-04
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
294107, 294115, 414739, B66C 316
Patent
active
048180050
ABSTRACT:
A grapple with a mounting bracket for attachment to the outer boom of an excavator having a hydraulic cylinder with a top jaw mounted for pivotal movement on the mounting bracket. A bottom jaw is attached to the mounting bracket for opening and closing cooperation with the top jaw. Linkages are connected, respectively, to the top and bottom jaws and to the hydraulic cylinder for unison powered movement of the top and bottom jaws into an open position, and for unison powered movement of the top and bottom jaws into a closed position by operation of only the single hydraulic cylinder through the linkage. The top jaw and the bottom jaw are coaxially mounted on the mounting bracket. The linkages include a top linkage bar connected by one end to the top jaw and a bottom linkage bar connected by one end to the bottom jaw. The other end of both top and bottom linkage bars are attached to the hydraulic cylinder through a hydraulic cylinder linkage bar.
REFERENCES:
patent: 1773478 (1930-08-01), Dovel
patent: 3802731 (1974-04-01), La Bounty
patent: 4131210 (1978-12-01), Everson
patent: 4268217 (1981-05-01), Perreault et al.
patent: 4283866 (1981-08-01), Ogawa
patent: 4413945 (1983-11-01), La Bounty
patent: 4519739 (1985-05-01), Risch
patent: 4635386 (1987-01-01), Kobayasi
Adams, III W. Thad
Cherry Johnny D.
Dudley Shearing Machine Mauf. Co. Limited
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