Hydraulic circuit for actuating materials handling machine

Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Motors connected in series

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414700, 414708, F15B 1122

Patent

active

056692820

ABSTRACT:
The hydraulic circuit of the invention includes first and second directional control valves 13, 15, each shiftable between three positions. Hydraulic circuit extending from the second directional control valve 15 and a second cylinder 7 to a first cylinder 11 is so configured that, when the second directional control valve 15 is shifted to the first position, with the first directional control valve 13 being assigned to the N-position, hydraulic oil from the second cylinder 7 is directed to the first cylinder 11, so as to cause the attachment 9 to be tilted in the forward direction, and when the second directional control valve 15 is shifted to the second position, hydraulic oil expelled from the second cylinder 7 is directed to the first cylinder 11, so as to cause the attachment 9 to be tilted in the rearward direction. The hydraulic circuit also includes flow restrictor means 20a which restricts a quantity of hydraulic oil flowing from the second cylinder 7 to the first cylinder 11, so that the attachment 9 may kept horizontally at any vertical position of the lift-arm 5. Thus, the lift-arm may be moved up and down, while keeping the attachment at the forward end of the lift-arm horizontally with respect to the ground surface, by actuating only a single directional control valve.

REFERENCES:
patent: 3563137 (1971-02-01), Graber et al.
patent: 4198822 (1980-04-01), Miller
patent: 4799851 (1989-01-01), Swanson
patent: 5447094 (1995-09-01), Geyler

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