Percussive drills

Details Percussive drills Percussive drills

1981-11-17

1984-04-17

Kazenske, E. R.

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173116, 173133, 173139, 173122, E02D 702

Patent

active

044429061

ABSTRACT:
A percussive drill has a bit holder, a percussive drive including a ram slidably mounted in a hollow piston, and a drive transmission for reciprocating the ram in the piston via an air cushion. The forward travel of the ram during percussive action of the drill is limited by a drill bit or an intermediate member interposed between the drill bit and the ram. A member holds the ram in a position further forward, than that attained during the above limited travel allowed the ram, when percussive action is not desired. The holding member is resilient, has a U shaped cross-section, and is entered by the ram as it moves to the further forward position, the ram then forming a seal therewith, and the member also functioning to absorb the energy of an impact by the ram.

REFERENCES:
patent: 3507337 (1970-04-01), Chromy
patent: 3791461 (1974-02-01), Rosselet
patent: 3828863 (1974-08-01), Bleicher et al.
patent: 3847229 (1974-11-01), Wanner et al.
patent: 3874460 (1975-04-01), Schmid et al.
patent: 3921729 (1975-11-01), Schmuck
patent: 4066136 (1978-01-01), Wanner et al.
patent: 4109734 (1978-08-01), Montabert
patent: 4131165 (1978-12-01), Wanner et al.
patent: 4236588 (1980-12-01), Moldan et al.
patent: 4284148 (1981-08-01), Wanner et al.

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