Pneumatically reversible ram boring device

Details Pneumatically reversible ram boring device Pneumatically reversible ram boring device

2011-01-25

2011-01-25

Wright, Giovanna C (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S019000, C173S091000

Reexamination Certificate

active

07874382

ABSTRACT:
A pneumatically reversible ram boring device includes a percussion piston (8) that is situated in a casing (1) and is movable back and forth by operation air supplied via an operational-air supply via an operational-air line (5), a control pipe (4, 36, 54) having at least one control opening (13), an outer pipe (15, 65), and a control sleeve (10, 60) that can be displaced by compressed air from a control chamber (16, 66). An essentially torsion-resistant operational-air line (5) can be rotatably connected to a rotary valve (4, 40, 70) that supplies the control chamber with operational air or vents air from the chamber.

REFERENCES:
patent: 4114700 (1978-09-01), Tkach et al.
patent: 4221157 (1980-09-01), Schimdt
patent: 4295533 (1981-10-01), Schimdt
patent: 5086848 (1992-02-01), Hudak
patent: 5307883 (1994-05-01), Jenne
patent: 3909567 (1993-08-01), None
patent: 19858519 (2002-08-01), None
patent: 1540344 (1977-05-01), None

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