Percussion hammer

Details Percussion hammer Percussion hammer

1974-02-11

1976-02-17

Cohen, Irwin C.

Expansible chamber devices

Annular working member or annular linearly extending chamber...

92109, 173139, 254 29A, E21B 1900, E01B 3100

Patent

active

039384276

ABSTRACT:
There is provided an improved percussion hammer having tie cables connecting the base of the hammer body with the upper cylinder. Cable tensioning jacks are used for preloading the tie cables. Each cable tensioning jack includes a jack body having a central opening for securing a cable, and having an annular groove defining a jack cylinder closed at one end and open at the other. An annular jack piston is slidably received within the jack cylinder. The annular cylinder is pressurized to expand the jack. In one embodiment of the invention high pressure grease provides the source of pressurized fluid.

REFERENCES:
patent: 1132321 (1915-03-01), Ferguson
patent: 2948122 (1960-08-01), Smith
patent: 2955578 (1960-10-01), Flessate et al.
patent: 2993448 (1961-07-01), Garey
patent: 3015975 (1962-01-01), Biach
patent: 3154006 (1964-10-01), Novak
patent: 3194536 (1965-07-01), Simms
patent: 3362682 (1968-01-01), Meschonat et al.
patent: 3375881 (1968-04-01), Myers et al.
patent: 3722332 (1973-03-01), Jones
patent: 3811653 (1974-05-01), Persicke

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