Hydraulically powered repetitive impact hammer

Tool driving or impacting – Impacting devices – Impact transmitting anvil

Patent

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Details

91173, 91224, 91229, B25D 918, F01L 1512

Patent

active

050658247

ABSTRACT:
An impact hammer according to this invention has a frame to house its actuating mechanism and to support a working impact tool which is to receive a sharp impact blow from the impact hammer and deliver it to a structure or formation that is to be pierced or fragmented. The impact tool projects from the frame and is axially reciprocable in the frame. A hammer head is reciprocably mounted in the frame with a close sliding fit. It has an impact face that faces toward the impact tool to strike the tool when the impact is intended to occur. At positions beyond this intended range, the hammer head is braked so it does not impact the frame. The blow to the tool is a high-energy, sharp blow, and is not intended to contribute a follow-on application of force after the initial impact. The hammer head has a shank, a loading shoulder and a poppet port. A poppet is reciprocably fitted in the hammer head with a poppet head so proportioned and arranged as to close the poppet port to enable the impact hammer to be loaded, and to be abruptly removed from the poppet port to enable the impact hammer to be fired. A firing pin is fitted in the frame to cooperate with the poppet to unseat the poppet when the impact hammer is to be fired.

REFERENCES:
patent: 1096886 (1914-05-01), Bayles
patent: 1264318 (1918-04-01), McGrath
patent: 2539292 (1951-01-01), Anderson
patent: 3101796 (1963-08-01), Stall et al.
patent: 3363512 (1968-01-01), Ottestad
patent: 3363513 (1968-01-01), Ottestad
patent: 3524385 (1970-08-01), Ottestad
patent: 4111269 (1978-09-01), Ottestad

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