Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1982-08-12
1985-03-12
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414708, E02F 386
Patent
active
045041857
ABSTRACT:
A hydraulic circuit for a hydraulic power shovel of the type having a swingable boom, swingable arm and a bucket attached to the end of the arm. The hydraulic circuit includes a levelling cylinder adapted to extend and contract in response to the swinging of the arm, and a switching valve device movable between a first position where it provides a communication between the levelling cylinder and a boom cylinder and a second position where it provides a communication between the levelling cylinder and an arm cylinder. When the switching valve device takes the first position, the levelling cylinder is communicated with the boom cylinder so that the boom is swung downwardly in response to the upward swinging of the arm, thereby to move the bucket horizontally. On the other hand, when the switching valve device takes the second position, the levelling cylinder and the boom cylinder are disconnected hydraulically so that the arm is allowed to swing independently of the boom.
REFERENCES:
patent: 3705631 (1972-12-01), Seaberg
patent: 3927781 (1975-12-01), Okabe
patent: 3952896 (1976-04-01), Hayward
Sakaki Yasuo
Tanaka Sotaro
Yagyu Takashi
Yamaguchi Takeshi
Hitachi Construction Machinery Co., Inc.
Spar Robert J.
Underwood Donald W.
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