Hammer drill device

Details Hammer drill device Hammer drill device

1993-06-14

1994-12-13

Buiz, Michael Powell

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173 78, 173 91, 173112, E21B 414

Patent

active

053721969

ABSTRACT:
Hammer device comprising a machine housing (1) with a hammer piston (2) movable to-and-fro. The movement to-and-fro of the hammer piston is controlled by a valve body (6) movable to-and-fro in the machine housing. In order to speed up the turning of the hammer piston at its rear end position the machine housing is provided with a room (10) which by the hammer piston is separated from connection with the valve body (6) at the same time as the rear end surface (5) is supplied with pressure fluid via a connection (11) opened by the hammer piston to the pressure source (8) when the hammer piston approaches its rear end position.

REFERENCES:
patent: 4194581 (1980-03-01), Walter
patent: 4509606 (1985-04-01), Willis
patent: 4819746 (1989-04-01), Brown et al.
patent: 5014796 (1991-05-01), Gustafsson
patent: 5085284 (1992-02-01), Fu
patent: 5115875 (1992-05-01), Ennis
patent: 5139096 (1992-08-01), Lister
patent: 5156223 (1992-10-01), Hipp

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