Patent US5499688A successfully refreshed from Google Patents.
US5499688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PDC insert featuring side spiral wear pads
Assignee: Dennis Tool Co
•
Filing: 1994-10-17
•
Granted: 1996-03-19
•
Expires: 2014-10-17
Abstract
Abstract The present disclosure sets forth various forms of inserts for operating as elements in bearing drill bits and similar devices. A single insert is formed with an external side face of cylindrical construction. One or more strips of hardened materials such as diamond or other hard material are provided along the side face. At the end face, the insert incorporates exposed tungsten carbide, diamond or other hard material. A PDC layer is optionally placed over the end face. The PDC layer has the form of a covering terminating at a radius of curvature.
Inventors
- 👤 Mahlon D. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:25
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5673; E21B10/5676; E21B10/573; E21B10/5735; Y; Y10; Y10T; Y10T408/00; Y10T408/81
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
127 words
A wear resistant insert to be fastened in a drill bit wherein the insert is exposed to abrasion and shock loading during use and is subject to wear as a result of use, the insert comprising: (a) an elongate cylindrical body formed of hard metal and having diamond like material therein wherein said body comprises a portion of a right cylinder with an end face and a cylindrical side face; (b) a spiraled strip of wear material extending along the side face and into said body so that said body has an exposed face of wear material; and (c) a wear material layer over said end face wherein said material forms an end face covering and has a radius of curvature to thereby avoid a sharp edge.
Claim 2
Dependent Claim
127 words
A wear resistant insert to be fastened in a drill bit wherein the insert is exposed to abrasion and shock loading during use and is subject to wear as a result of use, the insert comprising: (a) an elongate cylindrical body formed of hard metal and having diamond like material therein wherein said body comprises a portion of a right cylinder with an end face and a cylindrical side face; (b) a spiraled strip of wear material extending along the side face and into said body so that said body has an exposed face of wear material; and (c) a wear material layer over said end face wherein said material forms an end face covering and has a radius of curvature to thereby avoid a sharp edge.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 wherein said body has at least two of said spiral strips of wear material spaced around said body and spiralling along said body.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1 wherein said body includes at least two of said spiral strips and an end face of wear material.
Claim 5
Dependent Claim
13 words
The apparatus of claim 1 wherein said spiral strip is diamond like material.
Claim 6
Dependent Claim
16 words
The insert of claim 1 wherein said end face material layer thereon defines a recessed ring.
Claim 7
Dependent Claim
15 words
The apparatus of claim 1 wherein said insert end face includes a central circular area.
Claim 8
Dependent Claim
22 words
The apparatus of claim 1 wherein said end face includes an integrally formed insert in said end face of diamond like material.
Claim 9
Dependent Claim
109 words
A wear resistant bearing to be exposed to abrasion and shock loading during use and which is subject to wear as a result of use, the bearing comprising: (a) a cylindrical body formed of hard metal and having an end face of circular configuration and a side face along said cylindrical body; (b) at least one spiraled wear material strip extending along the side face and extending into the body so that the strip has an exposed face; and (c) wherein said strip of wear material is formed of a diamond like material and is crystalline in nature and provides wear resistance on the side face of said body.
Claim 10
Dependent Claim
109 words
A wear resistant bearing to be exposed to abrasion and shock loading during use and which is subject to wear as a result of use, the bearing comprising: (a) a cylindrical body formed of hard metal and having an end face of circular configuration and a side face along said cylindrical body; (b) at least one spiraled wear material strip extending along the side face and extending into the body so that the strip has an exposed face; and (c) wherein said strip of wear material is formed of a diamond like material and is crystalline in nature and provides wear resistance on the side face of said body.
Claim 11
Dependent Claim
20 words
The apparatus of claim 8 wherein said end face is covered by a bonded layer of diamond like material thereon.
Claim 12
Dependent Claim
28 words
The apparatus of claim 8 wherein said cylindrical body has a central reinforcing member bonded therein extending to a specified depth and having a controlled geometric cross section.
Claim 13
Dependent Claim
11 words
The apparatus of claim 10 wherein said cross section is circular.
Claim 14
Dependent Claim
15 words
The apparatus of claim 10 wherein said cross section is a three sided geometric figure.
Claim 15
Dependent Claim
18 words
The apparatus of claim 10 wherein said cross section is a geometric figure with at least four sides.
Claim 16
Dependent Claim
67 words
A wear resistant insert for a drill bit comprising: (a) an elongate cylindrical body having an end face and a cylindrical side face; (b) a spiraled strip of wear material extending along said face and embedded in said cylindrical body wherein said wear material is harder than said body; and (c) an end face covering bonded to said body and formed of harder material than said body:
Claim 17
Dependent Claim
67 words
A wear resistant insert for a drill bit comprising: (a) an elongate cylindrical body having an end face and a cylindrical side face; (b) a spiraled strip of wear material extending along said face and embedded in said cylindrical body wherein said wear material is harder than said body; and (c) an end face covering bonded to said body and formed of harder material than said body:
Claim 18
Dependent Claim
20 words
The apparatus of claim 14 wherein said end face is covered by a bonded layer of diamond like material thereon.
Claim 19
Dependent Claim
28 words
The apparatus of claim 14 wherein said body has at least two of said spiral strips of wear material spaced around said body and spiralling along said body.
Claim 20
Dependent Claim
23 words
The apparatus of claim 14 wherein said body includes at least two of said spiral strips and an end face of wear material.
Claim 21
Dependent Claim
13 words
The apparatus of claim 14 wherein said spiral strip is diamond like material.
Claim 22
Dependent Claim
22 words
The apparatus of claim 14 wherein said end face includes an integrally formed insert in said end face of diamond like material.
Claim 23
Dependent Claim
28 words
The apparatus of claim 14 wherein said cylindrical body has a central reinforcing member bonded therein extending to a specified depth and having a controlled geometric cross section.
Claim 24
Dependent Claim
28 words
The apparatus of claim 14 wherein said cylindrical body has a central reinforcing member bonded therein extending to a specified depth and having a controlled geometric cross section.
Claim 25
Dependent Claim
11 words
The apparatus of claim 21 wherein said cross section is circular.
Claim 26
Dependent Claim
15 words
The apparatus of claim 21 wherein said cross section is a three sided geometric figure.
Claim 27
Dependent Claim
18 words
The apparatus of claim 21 wherein said cross section is a geometric figure with at least four sides.
Claim 28
Dependent Claim
13 words
The apparatus of claim 14 wherein said end face is frustoconical in shape.
Claim 29
Dependent Claim
13 words
The apparatus of claim 14 wherein said end face is conic in shape.
References Cited (Backward Citations)
US4255165A
Cited
US4339009A
Cited
US5205684A
Cited
US4604106A
Cited
US4592433A
Cited
US4729603A
Cited
US4694918A
Cited
US4756631A
Cited
US4811801A
Cited
US5217081A
Cited
US5335738A
Cited
US5248006A
Cited
US5370717A
Cited
US5351770A
Cited
US5379853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |