Device for controlling the passage of a flushing medium in impac

Details Device for controlling the passage of a flushing medium in impac Device for controlling the passage of a flushing medium in impac

1990-02-14

1991-02-12

Dang, Hoang C.

Boring or penetrating the earth

With above-ground means to impact an earth-penetrating means

175215, 175218, 175318, 175324, E21B 2110

Patent

active

049916696

ABSTRACT:
Device in impact machines. The device comprises a set of rods comprising a number of rods (6) which are journalled in a surrounding set of tubes (7) by means of elastic bushings (52, 53). One of the bushings is provided with a lip (54) which sealingly rests against the rod (6) when flushing medium is not supplied to the space between the set of rods and the set of tubes but allows passage of flushing medium at drilling.

REFERENCES:
patent: 3077358 (1963-02-01), Costa
patent: 3173502 (1965-03-01), Overby
patent: 3941196 (1976-03-01), Curington et al.
patent: 3981368 (1976-09-01), Lundstrom et al.
patent: 4387775 (1983-06-01), Adolfsson et al.
patent: 4805705 (1989-02-01), Liljebrand et al.

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