Successive hole boring machine and lost strike preventing device

Details Successive hole boring machine and lost strike preventing device Successive hole boring machine and lost strike preventing device

1993-06-16

1994-10-25

Bui, Thuy M.

Boring or penetrating the earth

Common drive or advancing means for concurrently boring...

175296, E21B 406

Patent

active

053580605

ABSTRACT:
A plurality of rods each having a bit at a front end are disposed in parallel to one another so that adjacent bits are displaced to some extent forward and backward, and a striking device operatively connected to each of the rods includes a striking block. The striking block includes a single cylinder block having a plurality of cylinder tubes, and a striking piston is slidably fitted into each of the cylinder tubes. The striking block further includes a change-over valve for changing over between a forward movement and a backward movement of each striking piston. A rear end of each rod is connected through an adapter to a shank rod which is connected to the striking device. In the striking device, a spring is provided between a bearing holder which holds the shank rod rotatably and the adapter to push the rod in a forward direction. When the bit is not reached the rock, the rod is pushed forward by the spring to hold the shank rod at a position before the striking point.

REFERENCES:
patent: 3193025 (1965-07-01), Reitzel
patent: 3760887 (1973-09-01), Palauro
patent: 3760915 (1973-09-01), Young et al.
patent: 3912025 (1975-10-01), Deeter et al.
patent: 4681170 (1987-07-01), Ohi
patent: 4883133 (1989-11-01), Fletcher et al.
patent: 5139096 (1992-08-01), Lister
European Search Report Dated 08 Sep. 1993.

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