Boring or penetrating the earth – Cutter element laterally shiftable below ground – With shifting mechanism spring biased to operative position
Reexamination Certificate
2008-05-06
2008-05-06
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
With shifting mechanism spring biased to operative position
C175S323000, C175S062000, C175S258000, C175S366000, C299S107000
Reexamination Certificate
active
07367412
ABSTRACT:
A rock head for use with an auger borer to bore a passageway through a body of soil and rock and simultaneously laying a pipe in that bored passageway. The rock head has a base connectable to the leading end of the auger. A plurality of movable mounts are provided on the base and a roller cone is secured to each movable mount. A spring is disposed between the movable mount and the base. The spring is compressed as the movable mount pivots the roller cones inwardly toward a central region of the base. This reduces the diameter of the rock head so that it can travel through the bore. Each movable mount is provided with at least one wheel so that it can ride smoothly through the bore. When the rock head exits the pipe, the springs automatically pivots each roller cone outwardly so that at least a portion thereof is disposed beyond the outermost edge of the base. In this second position, the rock head has a greater diameter than the pipe bore and therefore it cannot travel therethrough. When the auger is withdrawn through the pipe, the movable mounts pivot the roller cones from the second position back to the first position, thereby causing the rock head to collapse to a diameter sufficiently small enough to travel back through the pipe.
REFERENCES:
patent: 3545811 (1970-12-01), Montacie
patent: 3561550 (1971-02-01), Mays
patent: 3583503 (1971-06-01), Coski
patent: 3837413 (1974-09-01), Dunn
patent: 3934660 (1976-01-01), Nelson
patent: 5711385 (1998-01-01), Brotherton
Barbera Anthony R.
Barbera David M.
Sand & Sebolt
Thompson Kenneth
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