Synchronized hydraulic hammer arrangement

Details Synchronized hydraulic hammer arrangement Synchronized hydraulic hammer arrangement

1988-06-30

1989-05-02

Yost, Frank T.

Tool driving or impacting

Power paths to plural tools from single drive

Drive plural means to reciprocate hammer heads or tools

173134, 91281, B25D 900

Patent

active

048259608

ABSTRACT:
Hydraulic hammers are useful for transmitting high impact blows to a tool for fracturing hard material. When two hammers are used in combination the impact blows delivered to a common tool by the hammers should be synchronized for maximum effectiveness. The subject synchronized hydraulic hammer arrangement includes a valve arrangement for alternately directing pressurized fluid to a variable volume chamber in each of a pair of hydraulic hammers to simultaneously retract a piston of each hydraulic hammer against the bias of pressurized gas in a gas chamber of each hydraulic hammer and exhausting the variable volume hydraulic chambers in response to at least one of the pistons reaching a predetermined position. The gas chambers are interconnected for equalizing the gas pressure therein. This arrangement of components provides synchronized movement of the pistons in an outward direction so that they simultaneously impact against the common tool.

REFERENCES:
patent: 4034817 (1977-07-01), Okada
patent: 4715265 (1987-12-01), Graul et al.

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