E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/14 (2006.01) E02F 5/10 (2006.01) E21B 34/12 (2006.01)
Patent
CA 2084650
ABSTRACT OF THE DISCLOSURE The present invention provides pneumatically operated impact-action self-propelled mechanism for driving holes in the earth, comprising a cylindrical housing assembly (1) with an anvil member (2) located at a forward end thereof; an impact piston (3) reciprocal in the housing to deliver successive impacts to the anvil member and forming with the housing a forward chamber (6) of variable volume; and a control assembly comprising a forwardly extending sleeve (8) which is slidably received within a rear space of said impact piston to form a rear chamber (7) of variable volume, and a central passage within said sleeve for continuous supply of compressed air through a forward opening of the sleeve into said rear chamber and therefrom into said forward chamber through a port (10) in a side wall of the rear chamber of said impact piston. The sleeve has at least one aperture (11) in its side near the forward opening and provided with valve means operable by twisting of the sleeve or a part thereof about its longitudinal axis, whereby when the aperture is closed by the valve means the compressed air is passed directly into the rear chamber for forward movement of the mechanism, and when the aperture is open compressed air can pass directly through said aperture and through said port into the forward chamber for reverse movement of the mechanism. The sleeve has a circular collar remote from its forward opening and rotationally slidable inside a surrounding circumferential bush to define thereby two relatively sliding surfaces, temporarily lockable relative to each other, whereby the sleeve can be located with the aperture (11) open or closed by the valve means.
Kayes Allan George
Riches Mckenzie & Herbert Llp
LandOfFree
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