Hydraulic hammer assembly having low vibration characteristics

Details Hydraulic hammer assembly having low vibration characteristics Hydraulic hammer assembly having low vibration characteristics

1997-11-10

1999-08-31

Johnson, Linda

Tool driving or impacting

Impacting devices

With impact cushioning means

173206, 173138, 173135, B25D 900

Patent

active

059441208

ABSTRACT:
A hammer assembly which decreases the severity of impact shocks generated by the hammer assembly during operation thereof is disclosed. The hammer assembly includes a housing defining a chamber. The housing further defines an injector port and an exhaust port each being in fluid communication with the chamber. The hammer assembly further includes a work tool positioned in the chamber, a piston positioned within the chamber, a first hydraulic pressure source which moves the piston in a work stroke toward the work tool, a second hydraulic pressure source which moves the piston in a return stroke away from the work tool, and a damping fluid source in fluid communication with the injector port. The hammer assembly still further includes a first valve which allows damping fluid to be advanced from the damping fluid source and into the chamber during the work stroke, and prevents damping fluid from being advanced from the damping fluid source and into the chamber during the return stroke. The hammer assembly yet further includes a second valve which allows damping fluid to be advanced out of the chamber through the exhaust port during the return stroke, and prevents damping fluid from being advanced into the chamber through the exhaust port during the work stroke. A method of reducing vibrations in a hammer assembly is also disclosed.

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