Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A drill assembly comprising mandrel means for rotatable mounting in a casing shoe at the bottom end of a drill string; bit means for rotatable mounting in said mandrel means beneath the bottom end of the drill string, said bit means and mandrel means normally rotating together in one direction with said bit means eccentric with respect to said mandrel means, whereby the bit means can bore a hole larger in diameter than the casing shoe; head means on said bit means for engaging a formation to stop rotation of said bit means; shoulder means on said bit means and said mandrel means for retaining said bit means in the eccentric drilling position; and cam means on said bit means for engaging said casing shoe when the bit means is moved upwardly against the casing shoe to cause said bit means to rotate in the other direction to a release position in which said bit means is aligned with the casing shoe for movement therethrough.
Claim 2
Dependent Claim
165 words
A drill assembly comprising mandrel means for rotatable mounting in a casing shoe at the bottom end of a drill string; bit means for rotatable mounting in said mandrel means beneath the bottom end of the drill string, said bit means and mandrel means normally rotating together in one direction with said bit means eccentric with respect to said mandrel means, whereby the bit means can bore a hole larger in diameter than the casing shoe; head means on said bit means for engaging a formation to stop rotation of said bit means; shoulder means on said bit means and said mandrel means for retaining said bit means in the eccentric drilling position; and cam means on said bit means for engaging said casing shoe when the bit means is moved upwardly against the casing shoe to cause said bit means to rotate in the other direction to a release position in which said bit means is aligned with the casing shoe for movement therethrough.
Claim 3
Dependent Claim
42 words
A drill assembly according to claim 1, wherein said shoulder means includes a first longitudinal shoulder on said mandrel means; and a second longitudinal shoulder on said bit means for engaging said first shoulder, said second shoulder means defining said cam means.
Claim 4
Dependent Claim
36 words
A drill assembly according to claim 2, including a first downwardly extending projection on said mandrel means defining said first shoulder; and a second upwardly extending projection on said bit means defining said second shoulder means.
Claim 5
Dependent Claim
34 words
A drill assembly according to claim 3, including a third shoulder on said first projection; and a fourth shoulder on said second projection for limiting rotation of said bit means beyond the release position.
Claim 6
Dependent Claim
60 words
A drill assembly according to claim 1, including an eccentric bore in the bottom end of said mandrel means for receiving said bit means; annular opposed groove means in said bore and in the upper end of said bit means; and ball means for removable mounting in said groove means to releasably retaining said bit means in said mandrel means.
Claim 7
Dependent Claim
38 words
A drill assembly according to claim 5, wherein said mandrel means includes first cylindrical body means; first shank means integral with first body means extending upward-y from the top end thereof, said body means containing said eccentric bore.
Claim 8
Dependent Claim
69 words
A drill assembly according to claim 6, wherein said bit means includes second cylindrical body mans; second shank means integral with said second body means extending upwardly from one side of the top of said second body means, said shank means containing one said annular groove means for receiving said ball means, said head means extending downwardly from one side of the bottom end of said second body means.
Claim 9
Dependent Claim
35 words
A drill assembly according to claim 7, wherein said mandrel means includes a first projection integral with said first body means extending downwardly from said first body means, said first projection defining a first shoulder.
Claim 10
Dependent Claim
57 words
A drill assembly according to claim 8, wherein said bit means includes a second projection integral with said second body means and said second shank means, said second projection extending upwardly along said second shank means and defining a second shoulder for engaging said first shoulder to cause said bit means to rotate with said mandrel means.
Claim 11
Dependent Claim
44 words
A drill assembly according to claim 9, including a third shoulder on said first projection; and a fourth shoulder on said second projection for engagement by said third shoulder to limit rotation of said bit means in said other direction to the release position.