Boring or penetrating the earth – Boring without earth removal
Patent
1991-03-04
1993-03-16
Bui, Thuy M.
Boring or penetrating the earth
Boring without earth removal
175 71, 175 92, 175296, 173 91, E21B 1102
Patent
active
051936275
ABSTRACT:
A forward and rearward running ramming device includes: a housing having a percussion head in which a percussion piston a axially displaced by compressed air; a control device for controlling the compressed air so that, during forward running the percussion piston strikes a front side of the housing, and during rearward running the percussion piston strikes a rear side of the housing, the control device interacting with control openings in the percussion piston, which control advancing movement and returning movement of the percussion piston, the control device being seated in a the housing and being connected, through the housing, to an air supply hose; an arresting device, which fixes the control device relative to the housing in individual switching positions, which are set by turning the air supply hose, wherein the arresting device is also a damping device, at least one air chamber, variable in size, being provided as arresting and damping element, the air chamber being bounded at end faces by rear and front terminating rings which are axially displaceable with respect to each other, the rear terminating ring being connected to the control device and the front terminating ring being connected to the housing; two energy accumulating elements, provided between the rings and pressing the rings apart; and a positioning device interacting with the front terminating ring and with the control device, the air chamber being connected to a source of compressed air, so that compressed air prevents inadvertent reversing during forward or rearward running.
REFERENCES:
patent: 3727701 (1973-04-01), Sudnishnikov et al.
patent: 4221157 (1980-09-01), Schmidt
patent: 4537265 (1985-08-01), Cox et al.
patent: 4618007 (1986-10-01), Kayes
patent: 4953626 (1990-09-01), Piittmann et al.
patent: 5050686 (1991-09-01), Jenne
patent: 5086848 (1992-02-01), Hudak
Bui Thuy M.
Schoeppel Roger J.
Terra AG
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