Ram-borer apparatus

Details Ram-borer apparatus Ram-borer apparatus

1973-07-30

1976-07-20

Purser, Ernest R.

Boring or penetrating the earth

Boring without earth removal

Drive point detached from shaft to form cased bore or with...

61 727, 285305, 175 73, 173131, E21B 1102, F16L 102

Patent

active

039701573

ABSTRACT:
A ram-borer apparatus is described which comprises a tubular housing, a percussion piston which is movable axially to and fro in the housing, and a striker-tip which is arranged to slide in an axial direction relative to the housing and which bears against the housing in the working direction via a resilient member. In accordance with the invention, there is attached to the rear end of the housing a drag-sock for coupling a tube or cable, etc. to the housing, and/or an expander-cone for enlarging the bore formed by the apparatus, and/or a steering tube for steering the apparatus along a straight or preselected arcuate path.

REFERENCES:
patent: 2750210 (1956-06-01), Trogdon et al.
patent: 3321033 (1967-05-01), Benuska et al.
patent: 3375885 (1968-04-01), Scott et al.
patent: 3407884 (1968-10-01), Zygmunt et al.
patent: 3474873 (1969-10-01), Zygmunt
patent: 3569912 (1971-03-01), Damm
patent: 3794128 (1974-02-01), Gagen et al.
patent: 3797586 (1974-03-01), Coyne et al.
patent: 3805899 (1974-04-01), Hicks et al.

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