Drill tube for use in upward rock drilling

Details Drill tube for use in upward rock drilling Drill tube for use in upward rock drilling

1997-12-04

1999-12-21

Bagnell, David

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With valve

166325, 1375155, F16K 1500

Patent

active

060036222

ABSTRACT:
Drill tube provided with a check valve and comprising a tube (1) and two end pieces (2,3). One of the end pieces comprises a first contact surface (4) for limiting the movement of a valve body (5) when the check valve is open and a second contact surface (6) against which a valve seat (7) rests. The valve seat is held in place by a lock ring (8) which preferably has circular cross section. The cooperating surfaces (12,11) on the valve body and valve seat are plane.

REFERENCES:
patent: 2223509 (1940-12-01), Brauer
patent: 2943639 (1960-07-01), Smith
patent: 3051196 (1962-08-01), Miller
patent: 3548868 (1970-12-01), Mullaney, III
patent: 4532958 (1985-08-01), Napolitano
patent: 4655248 (1987-04-01), Chalaire
Liljebrand, "Extended drill tube element for percussive top hammer drilling including specialised non-return valve allowing the drill tube element to be used for drilling in all directions, partic. upwardly", abstract of WIPO document 9425723, Nov. 1994.

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