Hammer Raising Device
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United States of America Patent
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Issued Date -
May 28, 2015
app pub date -
Jun 12, 2013
filing date -
Jun 14, 2012
priority date (Note) -
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Abstract
There is provided a hammer raising device. The hammer raising device is configured to increase striking intensity by eliminating fluid resistance when a piston raised upward moves downward. To achieve this, the hammer raising device includes a hydraulic control valve that controls a supply of a fluid, a sub cylinder to which the fluid is supplied by an operation of the hydraulic control valve, a sub piston that is partially accommodated within the sub cylinder, and is raised or lowered by the fluid, a main piston that comes in close contact with a longitudinal end of the sub piston to be raised by the raising of the sub piston, and is lowered when the closely contacted longitudinal end of the sub piston is separated, and a main cylinder that accommodates the main piston.
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