Document Type and Number:
Japanese Patent JPS633112
Kind Code:
B2
Abstract:
Continuously revolving percussion drilling machine, which comprises a body (1), a drill shank (2) mounted rotatably and axially slidably in the body for causing impacts on the drill rod, an impact mechanism (3) positioned in the body for causing axial impacts on the drill shank, and a rotating device (4) for rotating the drill shank around its axis. The drill shank is provided with a toothing (8), which is coupled in direct engagement with a toothing (9) revolving in relation to the drill shank and rotating the drill shank, said toothing of the drill shank being axially displaceable in relation to said rotating toothing, so that the contact surfaces of the teeth of the toothing on the drill shank and of the toothing rotating the drill shank revolve and are exchanged constantly. The teeth operate cold and well lubricated. The rotating toothing may be a cogwheel or a tooth rim.
Inventors:
PETSUKA SARUMI
HANNU PAASONEN
HANNU PAASONEN
Application Number:
JP17653783A
Publication Date:
January 21, 1988
Filing Date:
September 26, 1983
Export Citation:
Assignee:
TANPERA AB OY
International Classes:
E21B6/02; B23B45/16; E21B1/30; E21B6/00
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