Locking apparatus and method for hydraulic valve assembly

Details Locking apparatus and method for hydraulic valve assembly Locking apparatus and method for hydraulic valve assembly

1995-12-21

1997-04-22

Chambers, A. Michael

Fluid handling

Processes

Cleaning, repairing, or assembling

137383, 251 94, F16K 3500

Patent

active

056221991

ABSTRACT:
A hydraulic valve assembly for use with a fluid motor has a control device, e.g., a valve spool, mounted for movement between a neutral position for motor disabling and an output position for motor operation. The improvement comprises a locking surface on the device and a lock member engaging the surface when the device is in the neutral position. Such lock member prevents movement of the device to the output position. The valve assembly may have two control devices, each having a locking surface. The lock member engages (or disengages from) such surfaces simultaneously. Means for manual and remote shifting of the locking member are also disclosed. The new assembly is particularly useful in mobile machines having hydraulically-operated equipment, e.g., a loader bucket, which is raised above ground.

REFERENCES:
patent: 2276979 (1942-03-01), Jacobi
patent: 4083382 (1978-04-01), Khatti et al.
patent: 4306586 (1981-12-01), Spencer
patent: 4652059 (1987-03-01), Wittich
patent: 4995421 (1991-02-01), Bonacorsi et al.
patent: 5193431 (1993-03-01), Propsting et al.

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