US4087137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bushing and similar article
Assignee: Eastern Fusecoat Inc
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Filing: 1975-08-08
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Granted: 1978-05-02
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Expires: 1995-08-08
Abstract
Abstract A drill bushing or similar article, such as a pump bushing having a hardened body of steel and a thin inner coating of tungsten carbide distributed throughout a matrix of nickel chrome which provides a metallurgical bond to the steel body and a metallic bond to the particles of tungsten carbide. The drill bushing or similar article will have the wear characteristic of the solid tungsten carbide article, but would retain the coefficient of expansion characterisic of steel with the steel body eliminating the brittleness experienced in solid tungsten carbide articles.
Inventors
- 👤 Edward J. Voitas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:02
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; B; B23; B23B; B23B49/00; B23B49/02; B23B49/023; F16C2204/00; F16C2204/60; F16C2223/00; F16C2223/30; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/91
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
140 words
An article of manufacture for accurately confining a cylindrical element rotating about its longitudinal axis comprising: a body formed of a relatively rigid material such as steel and having a longitudinal opening therein; a liner of particles having a hardness of 84 - 93 Rockwell C in a matrix of material having a hardness of 59 - 67 Rockwell C bonded to at least a portion of the longitudinal opening in the body and having an opening therein to receive the cylindrical element and to permit said cylindrical element to rotate freely therein; the liner being such that the liner and the body together have a coefficient of thermal expansion substantially equal to that of the cylindrical element to thereby accurately maintain the position of the cylindrical element as it rotates and confine it to rotation about its longitudinal axis.
Claim 2
Dependent Claim
140 words
An article of manufacture for accurately confining a cylindrical element rotating about its longitudinal axis comprising: a body formed of a relatively rigid material such as steel and having a longitudinal opening therein; a liner of particles having a hardness of 84 - 93 Rockwell C in a matrix of material having a hardness of 59 - 67 Rockwell C bonded to at least a portion of the longitudinal opening in the body and having an opening therein to receive the cylindrical element and to permit said cylindrical element to rotate freely therein; the liner being such that the liner and the body together have a coefficient of thermal expansion substantially equal to that of the cylindrical element to thereby accurately maintain the position of the cylindrical element as it rotates and confine it to rotation about its longitudinal axis.
Claim 3
Dependent Claim
22 words
The invention of claim 1 wherein the particles of material having a hardness of 84 - 93 Rockwell C are tungsten carbide.
Claim 4
Dependent Claim
22 words
The invention of claim 1 wherein the matrix of material having a hardness of 59 - 67 Rockwell C is nickel chrome.
Claim 5
Dependent Claim
22 words
The invention of claim 3 wherein the particles of material having a hardness of 84 - 93 Rockwell C are tungsten carbide.
Claim 6
Dependent Claim
17 words
The invention of claim 4 wherein: the liner comprises a plurality of layers of tungsten carbide particles.
Claim 7
Dependent Claim
16 words
The invention of claim 4 wherein: the liner comprises a single layer of tungsten carbide particles.
Claim 8
Dependent Claim
24 words
The invention of claim 4 wherein: the longitudinal opening is a cylinder and is provided with an outwardly flared portion at one end thereof.
Claim 9
Dependent Claim
17 words
The invention of claim 7 wherein: the liner comprises a plurality of layers of tungsten carbide particles.
Claim 10
Dependent Claim
16 words
The invention of claim 7 wherein: the liner comprises a single layer of tungsten carbide particles.
Claim 11
Dependent Claim
14 words
The invention of claim 7 wherein: the longitudinal opening is a right circular cylinder.
Claim 12
Dependent Claim
17 words
The invention of claim 10 wherein: the liner comprises a plurality of layers of tungsten carbide particles.
Claim 13
Dependent Claim
16 words
The invention of claim 10 wherein: the liner comprises a single layer of tungsten carbide particles.
Claim 14
Dependent Claim
27 words
The invention of claim 7 wherein: the end portion of the body containing the outward flare is of a larger diameter than the balance of the body.
Claim 15
Dependent Claim
17 words
The invention of claim 13 wherein: the liner comprises a plurality of layers of tungsten carbide particles.
Claim 16
Dependent Claim
16 words
The invention of claim 13 wherein: the liner comprises a single layer of tungsten carbide particles.
Claim 17
Dependent Claim
15 words
The invention of claim 13 wherein: the liner is applied to the outwardly flared portion.
Claim 18
Dependent Claim
17 words
The invention of claim 16 wherein: the liner comprises a plurality of layers of tungsten carbide particles.
Claim 19
Dependent Claim
16 words
The invention of claim 16 wherein: the liner comprises a single layer of tungsten carbide particles.
Claim 20
Dependent Claim
15 words
The invention of claim 7 wherein: the liner is applied to the outwardly flared portion.
Claim 21
Dependent Claim
17 words
The invention of claim 19 wherein: the liner comprises a plurality of layers of tungsten carbide particles.
Claim 22
Dependent Claim
16 words
The invention of claim 19 wherein: the liner comprises a single layer of tungsten carbide particles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |