EP0154422A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in rotary drill bits
Assignee: Camco Drilling Group Ltd
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Filing: 1985-02-11
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Granted: —
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Expires: 2005-02-11
Abstract
Abstract A rotary drill bit for use in drilling or coring deep holes in subsurface formations comprises a bit body 10 having a shank for connection to a drill string, a plurality of cutting elements 18 mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body. At least some of the cutting elements 18 are each mounted on a stud 19 which is received in a socket 20 in the bit body, there being provided within the socket and disposed around at least a portion of the periphery of the stud resiliently compressible retaining means, such as a corrugated sleeve 25 which is formed separately from the stud and bit body and is resiliently compressed between the stud and the wall of the socket so as frictionally to retain the carrier in the socket.
Inventors
- 👤 David Shirley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 15:45
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/573; E21B10/62; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49876; Y10T29/49945
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
150 words
A rotary drill bit, for use in drilling or coring deep holes in subsurface formations, comprising a bit body (10) having a shank (11) for connection to a drill string, a plurality of cutting elements (18) mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body, at least some of the cutting elements (18) each being mounted on a carrier (19) which is received in a socket (20) in the bit body, characterised in that there is provided within the socket (20) and disposed around at least a portion of the periphery of the carrier (19) resiliently compressible retaining means (25) which are formed separately from the carrier and bit body and are resiliently compressed between the carrier and the wall of the socket so as frictionally to retain the carrier in the socket.
Claim 2
Dependent Claim
150 words
A rotary drill bit, for use in drilling or coring deep holes in subsurface formations, comprising a bit body (10) having a shank (11) for connection to a drill string, a plurality of cutting elements (18) mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body, at least some of the cutting elements (18) each being mounted on a carrier (19) which is received in a socket (20) in the bit body, characterised in that there is provided within the socket (20) and disposed around at least a portion of the periphery of the carrier (19) resiliently compressible retaining means (25) which are formed separately from the carrier and bit body and are resiliently compressed between the carrier and the wall of the socket so as frictionally to retain the carrier in the socket.
Claim 3
Dependent Claim
27 words
A drill bit according to Claim 1, wherein said retaining means comprise an arcuate element (25) extending around a portion of the periphery of the carrier (19).
Claim 4
Dependent Claim
30 words
A drill bit according to Claim 2, wherein the arcuate element (25) is pre-shaped to conform substantially to the portion of the periphery of the carrier (19) which it engages.
Claim 5
Dependent Claim
25 words
A drill bit according to Claim 2 or Claim 3, wherein the arcuate element extends around only a portion of the periphery of the carrier.
Claim 6
Dependent Claim
25 words
A drill bit according to Claim 2 or Claim 3, wherein the arcuate element (25) extends around substantially the whole periphery of the carrier (19).
Claim 7
Dependent Claim
28 words
A drill bit according to any of Claims 2 to 5, wherein the arcuate element (25) is formed from metal which is corrugated to provide the resilience thereof.
Claim 8
Dependent Claim
21 words
A drill bit according to Claim 6, wherein the corrugations extend substantially parallel to the central axis of the carrier (19).
Claim 9
Dependent Claim
50 words
A drill bit according to any of Claims 2 to 5, wherein the arcuate element is formed from material which is inherently resiliently compressible so that said material substantially fills the space between the portion of the carrier (19) around which it extends and the wall of the socket (20).
Claim 10
Dependent Claim
32 words
A drill bit according to Claim 1, wherein said retaining means comprise a plurality of separate resiliently compressible elements disposed side-by-side around at least a portion of the periphery of the carrier.
Claim 11
Dependent Claim
35 words
A drill bit according to any of Claims 1 to 9, wherein the internal wall of the socket (20) is formed with a recess (24) in which said retaining means are at least partly located.
Claim 12
Dependent Claim
42 words
A drill bit according to Claim 10, and in which the retaining means (25) extend around substantially the whole periphery of the carrier, wherein said recess (24) comprises an annular groove extending around the whole periphery of the wall of the socket.
Claim 13
Dependent Claim
32 words
A drill bit according to any of Claims 1 to 11, wherein the carrier (19) is formed with a recess (26) in which the retaining means (25) are at least partly located.
Claim 14
Dependent Claim
28 words
A drill bit according to Claim 12, wherein the recess in the carrier (19) comprises an annular groove (26) which extends around the whole periphery of the carrier.
References Cited (Backward Citations)
No citation records indexed.
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