US4382477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drill bits
Assignee: Drilling and Service UK Ltd
•
Filing: 1981-01-09
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Granted: 1983-05-10
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Expires: 2001-01-09
Abstract
Abstract In a rotary drilling bit having preform cutting elements, a partial or total structural discontinuity is disposed between the elements and the underlying structure or within the underlying structure to reduce the bending strain upon the preform cutting elements. In this way there is a reduction in the fracture or damage of preform cutting elements.
Inventors
- 👤 John D. Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:47
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/573; E21B10/62; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1908; Y10T407/192; Y10T407/1934; Y10T407/1936
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
134 words
A rotary drill bit for deep hole drilling or coring in subsurface formations comprising a body with a shank having a fluid bore, said body carrying a plurality of preform cutting elements and support members, in which each preform cutting element is loosely mounted in contact with the respective support member and flexible locating means are provided to hold the preform cutting element in contact with the support member and to reduce the bending strain in the preform cutting element caused by deflection of the support member in use of the bit, in which the flexible locating means comprises an elongate locating means one end of which is fixed to the bit body at a position spaced from the support member and the other end of which urges the preform towards the support member.
Claim 2
Dependent Claim
134 words
A rotary drill bit for deep hole drilling or coring in subsurface formations comprising a body with a shank having a fluid bore, said body carrying a plurality of preform cutting elements and support members, in which each preform cutting element is loosely mounted in contact with the respective support member and flexible locating means are provided to hold the preform cutting element in contact with the support member and to reduce the bending strain in the preform cutting element caused by deflection of the support member in use of the bit, in which the flexible locating means comprises an elongate locating means one end of which is fixed to the bit body at a position spaced from the support member and the other end of which urges the preform towards the support member.
Claim 3
Dependent Claim
16 words
A bit according to claim 1, in which the flexible locating means comprises a leaf spring.
Claim 4
Dependent Claim
32 words
A bit according to claim 1, in which the fixed end of the locating means is wedged between two separable parts, one of which defines the support for the preform cutting element.
Claim 5
Dependent Claim
34 words
A bit according to claim 1, including additional means to locate the cutting element on the support member to prevent translatory movement of the preform cutting element along a fixed surface of the support.
Claim 6
Dependent Claim
34 words
A bit according to claim 1, including additional means to locate the cutting element on the respective support member to prevent rotation of the preform cutting element in the plane of its cutting surface.
Claim 7
Dependent Claim
29 words
A bit according to claim 4, in which the additional means comprises a peg formed separately from both the element and the support and secured to one of them.
Claim 8
Dependent Claim
17 words
A bit according to claim 1, adapted to receive a detachable support including the preform cutting element.
Claim 9
Dependent Claim
22 words
A bit according to claim 7, including a socket adapted to receive a stud to which is secured the preform cutting element.
Claim 10
Dependent Claim
132 words
A rotary drill bit for deep hole drilling or coring in subsurface formations comprising a body with a shank having a fluid bore, said body carrying a plurality of preform cutting elements and support members in which each preform cutting element is loosely mounted in contact with the respective support member and flexible locating means are provided to hold the preform cutting element in contact with the support member and to reduce the bending strain in the preform cutting element caused by deflection of the support member in use of the bit, in which the preform cutting element is bonded to a backing element which is loosely mounted in contact with the support member and the flexible locating means is arranged to hold the backing element in contact with the support member.
Claim 11
Dependent Claim
132 words
A rotary drill bit for deep hole drilling or coring in subsurface formations comprising a body with a shank having a fluid bore, said body carrying a plurality of preform cutting elements and support members in which each preform cutting element is loosely mounted in contact with the respective support member and flexible locating means are provided to hold the preform cutting element in contact with the support member and to reduce the bending strain in the preform cutting element caused by deflection of the support member in use of the bit, in which the preform cutting element is bonded to a backing element which is loosely mounted in contact with the support member and the flexible locating means is arranged to hold the backing element in contact with the support member.
Claim 12
Dependent Claim
20 words
A bit according to claim 9, in which the flexible locating means comprises a neck integral with the backing element.
Claim 13
Dependent Claim
25 words
A bit according to claim 9, in which the flexible locating means comprises elongate elastic rods extending between the bit body and the backing element.
Claim 14
Dependent Claim
24 words
A bit according to claim 9, in which the flexible locating means is integral both with the backing element and with the support member.
Claim 15
Dependent Claim
17 words
A bit according to claim 9, adapted to receive a detachable support including the preform cutting element.
Claim 16
Dependent Claim
22 words
A bit according to claim 13, including a socket adapted to receive a stud to which is secured the preform cutting element.
Claim 17
Dependent Claim
92 words
A rotary drill bit for deep hole drilling or coring in subsurface formations comprising a body with a shank having a fluid bore, said body carrying a plurality of preform cutting elements and support members, in which each preform cutting element is loosely mounted in contact with the respective support member, and in which at least one slot or aperture is provided extending parallel to the major face of the preform to reduce the bending strain in the cutting element caused by deflection of the support member in use of the bit.
Claim 18
Dependent Claim
92 words
A rotary drill bit for deep hole drilling or coring in subsurface formations comprising a body with a shank having a fluid bore, said body carrying a plurality of preform cutting elements and support members, in which each preform cutting element is loosely mounted in contact with the respective support member, and in which at least one slot or aperture is provided extending parallel to the major face of the preform to reduce the bending strain in the cutting element caused by deflection of the support member in use of the bit.
Claim 19
Dependent Claim
17 words
A bit according to claim 15, adapted to receive a detachable support including the preform cutting element.
Claim 20
Dependent Claim
26 words
A bit according to claim 15, in which the bit includes a socket adapted to receive a stud to which is secured the preform cutting element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |