Hydraulic circuit for earthworking implement

Details Hydraulic circuit for earthworking implement Hydraulic circuit for earthworking implement

1979-04-09

1981-03-17

Sheridan, Robert G.

Material or article handling

Vertically swinging load support

Shovel or fork type

91401, 212189, B66C 2366

Patent

active

042564336

ABSTRACT:
A hydraulic circuit for supplying fluid to a ram to move an elongated member about a fixed axis on a frame includes a reservoir, pump, valve and conduits connected to opposite ends of the fluid ram. The fluid ram includes a cylinder pivoted on a ram pivot on the frame adjacent to and outside the fixed axis and the elongated axis of the member is moved across the ram pivot as the member is moved between working and transport positions. The hydraulic circuit incorporates a valve element carried by the piston and moved from a seated position at the critical time when the elongated axis is generally coincident with the ram axis to interconnect the two cylinder chambers and assist in moving the axis across the ram axis.

REFERENCES:
patent: 3376984 (1968-04-01), Long et al.
patent: 3450006 (1969-06-01), White
patent: 3515224 (1970-06-01), Seaberg
patent: 3951281 (1976-04-01), Parquet
patent: 3955695 (1976-05-01), Maurer
patent: 4026428 (1977-05-01), Shumaker
patent: 4074821 (1978-02-01), Long
patent: 4132324 (1979-01-01), Long
patent: 4138928 (1979-02-01), Pilch

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