Hydraulic hammering device
Number of patents in Portfolio can not be more than 2000
United States of America
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Dec 28, 2021
Grant Date -
Dec 17, 2020
app pub date -
Jan 12, 2018
filing date -
Jan 12, 2018
priority date (Note) -
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Abstract
A hydraulic hammering device includes a piston front chamber and a piston rear chamber defined between an outer circumferential surface of the piston and an inner circumferential surface of the cylinder and disposed separately from each other at front and rear, respectively, in an axial direction. A switching-valve mechanism drives the piston by switching at least one of the piston front chamber and the piston rear chamber into communication with at least one of a high pressure circuit and a low pressure circuit. An acceleration piston is disposed behind the piston and is configured to come into contact with the piston during a retreat stroke thereof to urge the piston forward, in which a timing where the acceleration piston itself starts to come in contact with the piston is set to be earlier than a timing where the piston is braked by the switching-valve mechanism.
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