Rotary drill bit
First Claim
Patent Images
1. A drill bit comprising:
- (a) a shaft;
(b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and
(c) a plurality of cutting element, each element comprising(1) a tapered, integral pin having a smaller one of the two ends disposed in one of said recesses, and the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, and(2) a thin polycrystalline layer of self-bonded diamond crystals directly bonded to the other end of said pin at an interface consisting of the material of said pin and said crystals.
0 Assignments
0 Petitions
Accused Products
Abstract
A rotary drill bit for rock drilling comprising a plurality of cutting elements mounted by interference-fit in recesses in the crown of the drill bit. Each cutting element comprises an elongated pin with a thin layer of polycrystalline diamond bonded to the free end of the pin.
394 Citations
55 Claims
-
1. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting element, each element comprising (1) a tapered, integral pin having a smaller one of the two ends disposed in one of said recesses, and the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, and (2) a thin polycrystalline layer of self-bonded diamond crystals directly bonded to the other end of said pin at an interface consisting of the material of said pin and said crystals. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft, said crown having a plurality of recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) an integral pin having one end tightly held in one of said recesses; and (2) a thin polycrystalline layer of abrasive crystals directly bonded to the other end of said pin at an interface, said interface consisting of the material of said pin and the abrasive crystals and, said layer having a hemispherical outer surface. - View Dependent Claims (8, 9, 10, 11)
-
-
12. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin having the smaller one of the two ends disposed in one of said recesses, and the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, and (2) a thin layer of polycrystalline abrasive crystals bonded to the other end of said pin, said layer having a hemispherical outer surface. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin, the smaller one of the two ends of said pin disposed in one of said recesses, the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said recess by a self-locking friction-fit, and the other end of said pin having a reduced diameter hemispherical projection, and (2) a thin polycrystalline layer of abrasive crystals bonded to the other end of said pin, said layer having a right cylindrical outer surface. - View Dependent Claims (22, 23, 24, 25, 26, 27)
-
-
28. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin having the smaller one of the two ends disposed in one of said recesses, and the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, the other end of said pin having a reduced diameter hemispherical projection; and (2) a thin layer of polycrystalline abrasive crystals bonded to said other end of said pin. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin having the smaller one of the two ends disposed in one of said recesses, and the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, said other end of said pin being serrated; and (2) a thin layer of polycrystalline abrasive crystals bonded to said other end of said pin. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45)
-
-
46. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft, said crown having a plurality of recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) an integral, cemented carbide pin having one end tightly held in one of said recesses; and (2) a thin polycrystalline layer of diamond directly bonded to the other end of said pin at an interface, said interface consisting of the material of said pin and the layer, said layer having a hemispherical outer surface. - View Dependent Claims (47, 48, 49, 50)
-
-
51. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin having the smaller one of the two ends disposed in one of said recesses, and the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit; and (2) a thin polycrystalline layer of self-bonded diamond crystals bonded to the other end of said pin, said layer having a hemispherical outer surface. 52. A drill bit comprising; (a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin, the smaller one of the two ends of said pin disposed in one of said recesses, the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, and the other end of said pin having a reduced diameter hemispherical projection, and (2) a thin polycrystalline layer of self-bonded diamond crystals bonded to
-
-
52. said other end about said projection. 53. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin, the smaller one of the two ends of said pin disposed in one of said recesses, the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said one recess by a self-locking friction-fit, and the other end of said pin having serrations formed therein, and (2) a thin polycrystalline layer of self-bonded diamond crystals bonded to
-
-
53. the other end of said pin. 54. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft, said crown having a plurality of recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) an integral pin, one end tightly held in one of said recesses, and the other end having a reduced diameter hemispherical projection; and (2) a thin polycrystalline layer of abrasive crystals directly bonded to the other end of said pin at an interface, said interface consisting of
-
-
54. the material of said pin and the abrasive crystals. 55. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft having a plurality of inwardly tapered recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) a tapered pin, the smaller one of the two ends of said pin disposed in one of said recesses, the tapers of said pin and said one recess sized such that said pin is in a state of radial compression and is retained in said recess by a self-locking friction-fit, and the other end of said pin having serrations formed therein, and (2) a thin polycrystalline layer of abrasive crystals bonded to the other
-
-
55. end of said pin, said layer having a right cylindrical outer surface. 56. A drill bit comprising:
-
(a) a shaft; (b) a crown fixed to one end of said shaft, said crown having a plurality of recesses formed therein; and (c) a plurality of cutting elements, each element comprising (1) an integral, cemented carbide pin, one end thereof tightly held in one of said recesses, and the other end thereof having a reduced diameter hemispherical projection; and (2) a thin polycrystalline layer of diamond directly bonded to the other end of said pin at an interface, said interface consisting of the material of said pin and the layer.
-
Specification