Ram boring implement

Details Ram boring implement Ram boring implement

1988-01-04

1989-06-20

Dang, Hoang C.

Boring or penetrating the earth

Boring without earth removal

173 91, 175 92, 175296, E21B 414

Patent

active

048402370

ABSTRACT:
A ram boring implement has a pneumatically driven percussion piston (16), which is movable in the axial direction in a reciprocating manner in a housing (12), and a control sleeve (24) which is axially adjustable for reversing the direction of motion of the ram boring implement and is acted upon by the pressure in one (20) of the pressure chambers (18, 20) formed on both sides of the percussion piston (16). The control sleeve (24) can be adjusted by means of a spindle drive (30, 50) by turning a compressed air supply hose (26). According to the invention, the control sleeve is arranged on a core (30, 34), supported in an axially fixed manner on the housing (12), so that the control sleeve itself forms only a relatively small annular effective area (52) acted upon by pressure. This makes it possible for the control sleeve to be moved forward or toward the rear without the compressed air feed having to be interrupted.

REFERENCES:
patent: 3551874 (1972-03-01), Sudnishnikov et al.
patent: 3616865 (1971-11-01), Sudnoshnikov et al.
patent: 3995702 (1976-12-01), Klimashko et al.
patent: 4609052 (1986-09-01), Lewin
patent: 4618007 (1986-10-01), Kayes

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