Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent
1996-08-23
1998-09-22
Schoeppel, Roger J.
Boring or penetrating the earth
Bit or bit element
Cutting edges facing in opposite axial directions
299104, 299113, E21B 1000
Patent
active
058101020
ABSTRACT:
A reversible bit assembly (8) that includes a reversible bit (10) having a shank (20) and a radially enlarged center portion (22) located midway along the longitude of the shank (20). Opposed cutting tips (24) are located at opposed shank ends (23). The bit (10) is insertable into a bore (12) of a bit block (14) and held therein using a retention mechanism. A preferred retention mechanism includes a circumferential groove (34) in the bit center portion (22) and a cross hole (38) in the bit block (14) located tangent to the bore (12) at a position corresponding to the location of the groove (34) when the bit (10) is inserted in the block (14). A pin (46) inserts into the cross hole (38) to retain the bit (10) at the groove (34). An adaptor sleeve (16) is provided that may be inserted into the block (14) to additionally allow known bits (18) to be used in the block (14).
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