Title: Automatic hydraulic hammer

Abstract: An automatic hydraulic hammer including a frame with suitable mountings to attach the frame to an existing hydraulic feed test boring drill machine. A weighted hammer is reciprocal within the frame through a measured distance and is arranged for substantially frictionless operation. A hydraulic cylinder mounts upon the frame and receives its power from the hydraulic test boring drill machine. A plunger is responsive to function of the hydraulic cylinder and terminates downwardly in an arrow-shaped head which releasably connects to a plurality of pivotally mounted clamps. When the head engages the clamps, the hydraulic cylinder is functioned to raise the plunger and the releasably attached hammer through a known distance. The top of the frame is provided with a plurality of depending fingers which function with the clamps to quickly and positively release the head at the top of the hammer travel. The release of the hammer permits a free fall within the guide frame through a known distance in accordance with standard penetration test procedures.

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Inventors: Pappert, Joseph A. (Turnersville, NJ, US)

Application Number: 412019
Filing Date: 1973-11-01
Publication_date: 1976-01-27
Assignee:
Primary Class(es): 173/124 74/110, 74/160, 173/126, 173/132
Other Classes:
US Patent Ref:

224483	Feb, 1880	Segur	173/84.
841032	Jan, 1907	Mellgren	173/124.
2559478	Jul, 1951	Stone	173/124.
2787123	Apr, 1957	Delvaux	173/127.
3039546	Jun, 1962	Janson et al.	173/124.

Other Refs:
Primary Examiner: Abbott, Frank L.
Assistant Examiner: Pate, III, William F.
Attorney: