Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1989-02-23
1990-04-03
Werner, Frank E.
Material or article handling
Vertically swinging load support
Shovel or fork type
91436, E02F 343
Patent
active
049136160
ABSTRACT:
A hydraulic system for use in moving a bucket on an earth-working machine that includes a hydraulic cylinder and power piston with the piston being operably connected to the bucket. A change-over valve connects a source of pressure fluid and the reservoir to the opposite axial sides of the piston to move the piston in a selected direction and pivot the bucket either clockwise or counterclockwise. When the bucket is being moved in its clockwise position to dump the bucket, gravity assists its movement, and the bucket begins to actually move the power piston. When this happens, the piston may move so quickly that the hydraulic pump cannot supply adequate hydraulic fluid to the chamber in the cylinder. To supplement the hydraulic pump and ensure that the hydraulic chamber has sufficient fluid in it, a regeneration valve is disposed in a line returning fluid to the reservoir. When the change-over valve is in a position that will cause the bucket to be dumped, the regeneration valve is biased to a position that will restrict flow back to the reservoir and will cause a portion of the fluid being returned to the reservoir to be bypassed back into the line leading to the cylinder chamber that is powering the movement of the piston and bucket. By doing this, the regeneration valve supplements the hydraulic pump and will ensure that there is always sufficient fluid within the cylinder chamber.
REFERENCES:
patent: 4165613 (1979-08-01), Bernhoft et al.
patent: 4779418 (1988-10-01), Artzberger
patent: 4836088 (1989-06-01), Seabaugh
Gossett Dykema
J. I. Case Company
Underwood Donald W.
Werner Frank E.
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