Safety apparatus for hydraulic valves in dump body mechanism

Details Safety apparatus for hydraulic valves in dump body mechanism Safety apparatus for hydraulic valves in dump body mechanism

1976-01-28

1977-01-18

Spar, Robert J.

Land vehicles: dumping

Tilting

Operating mechanism

298 22F, 298 22P, B60P 128

Patent

active

040036014

ABSTRACT:
The hydraulic valve which controls the hydraulic cylinders in a dump body mechanism has its control member coupled by a cable to the dump body to automatically shift the valve from its "raise" to its "neutral" condition when the dump body reaches its uppermost position when being raised. Two lever arms are pivotally attached to the valve body adjacent to each other, the first lever arm being coupled to the valve control member and to a manual control lever, and the second lever being coupled to the dump body cable. A first abutment is attached to the second lever in position to engage the first lever to move it from its "raise" to its "neutral" position in response to movement of the second lever caused by a pull on the dump body cable. A second abutment is positioned opposite the second lever to prevent the valve control member from being moved from its "neutral" to its "lower" position in response to a pull on said dump body cable, thereby preventing accidental lowering of the dump body if a workman should bump into the cable while the dump body is raised. The two abutments do not prevent the manual control lever and first lever arm from being manually shifted in the cab from their "neutral" to their "lower" condition to initiate lowering of the dump body when desired.

REFERENCES:
patent: 2517153 (1950-08-01), Wood
patent: 2720417 (1955-10-01), Kling

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