US4826143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a spring of the cylindrical type to be used at high temperature
Assignee: US Philips Corp
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Filing: 1988-08-12
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Granted: 1989-05-02
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Expires: 2008-08-12
Abstract
Abstract The invention relates to a method of manufacturing a spring (10) of the cylindrical type to be used at high temperatures. This spring (10) is made of refractory material, such as quartz, boron nitride or graphite. It is constituted by recesses (11 1 to 11 7 ) not adjoining each other, having a height h and which are distributed along a helical line. The method of manufacturing utilizes a wire saw for forming these recesses in a cylindrical tube, which is subjected to a rotation after each sawing operation. The absence of microcracks imparts a high elasticity to the spring up to high temperatures. It is used for transmitting movements at high temperatures, more particularly when conditions of perfect cleanliness are desired, as, for example, in the case of semiconductor metallurgy.
Inventors
- 👤 Bernard Latorre
- 👤 Claude Foucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14; B; B23; B23D; B23D57/00; B23D57/0007; B23D57/0023; B28; B28D; B28D5/00; B28D5/0058; B28D5/04; B28D5/045; C04B35/515; C04B35/52; C04B35/58; C04B35/583; F; F16; F16F; F16F1/00; F16F1/02; F16F1/021; F16F1/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
257 words
A method of manufacturing a cylindrical type spring for use at high temperatures comprising the steps of providing a hollow substantially cylindrical tube formed solely of a non-metallic refractory material; partially cutting said hollow substantially cylindrical tube with at least one wire in a direction transverse to a longitudinal axis of said cylindrical tube, said step of cutting being carried out by sawing said at least one wire through a cylindrical side of said tube, and through a hollow space of said cylindrical tube until a leading edge of said at least one wire is substantially touching an inner wall of said hollow cylindrical wall at a side of said tube opposite to initial sawing by said least one wire, and withdrawing said at least one wire from said cylindrical tube; rotating said cylindrical tube by an angle equal to 360°/n, where n equals a number of recesses to be cut into said cylindrical tube, and moving said cylindrical tube a distance T/n in the longitudinal direction of said cylindrical tube, where T equals a distance or pitch between two successive recesses; again partially cutting said cylindrical tube with said at least one wire at said distance T/n and at said angle 360°/n through said cylindrical tube and through said hollow space until said leading edge is substantially touching the opposite said inner wall, and withdrawing said at least one wire from said cylindrical tube; and repeating said steps of rotating, moving, again partially cutting, and withdrawing until n recesses have been cut into said cylindrical tube.
Claim 2
Independent Claim
257 words
A method of manufacturing a cylindrical type spring for use at high temperatures comprising the steps of providing a hollow substantially cylindrical tube formed solely of a non-metallic refractory material; partially cutting said hollow substantially cylindrical tube with at least one wire in a direction transverse to a longitudinal axis of said cylindrical tube, said step of cutting being carried out by sawing said at least one wire through a cylindrical side of said tube, and through a hollow space of said cylindrical tube until a leading edge of said at least one wire is substantially touching an inner wall of said hollow cylindrical wall at a side of said tube opposite to initial sawing by said least one wire, and withdrawing said at least one wire from said cylindrical tube; rotating said cylindrical tube by an angle equal to 360°/n, where n equals a number of recesses to be cut into said cylindrical tube, and moving said cylindrical tube a distance T/n in the longitudinal direction of said cylindrical tube, where T equals a distance or pitch between two successive recesses; again partially cutting said cylindrical tube with said at least one wire at said distance T/n and at said angle 360°/n through said cylindrical tube and through said hollow space until said leading edge is substantially touching the opposite said inner wall, and withdrawing said at least one wire from said cylindrical tube; and repeating said steps of rotating, moving, again partially cutting, and withdrawing until n recesses have been cut into said cylindrical tube.
Claim 3
Dependent Claim
31 words
A method according to claim 1, wherein said at least one wire for carrying out said steps of sawing is a multiwire structure having a plurality of wires in parallel disposition.
Claim 4
Dependent Claim
22 words
A method according to claim 1 or claim 2, wherein said at least one wire forms said recesses with a rounded bottom.
Claim 5
Dependent Claim
16 words
A method according to claim 1, or claim 2, wherein said non-metallic refractory material is quartz.
Claim 6
Dependent Claim
17 words
A method according to claim 1 or claim 2, wherein said non-metallic refractory material is boron nitride.
Claim 7
Dependent Claim
16 words
A method according to claim 1 or claim 2, wherein said non-metallic refractory material is graphite.
Claim 8
Dependent Claim
19 words
A method according to claim 1 or claim 2, wherein said spring is used at temperatures exceeding 1000° C.
Claim 9
Dependent Claim
134 words
A spring structure comprising a hollow substantially cylindrical tube formed solely of a non-metallic refractory material, said cylindrical tube having a plurality of n recesses extending transversely through sides of said cylindrical tube and a hollow interior space to inner surfaces of said cylindrical tube, said recesses having a dimension h along a longitudinal axis of said cylindrical tube, and said recesses being rotated from one another about said cylindrical tube by an angle 360°/n, said recesses being separated from one another along an exterior surface of said cylindrical tube parallel to said longitudinal axis by a distance e, said plurality of n recesses repeating one another over a distance T parallel to said longitudinal axis with successive recesses being separated by a distance T/n parallel to said longitudinal axis where e equals T/n.
Claim 10
Dependent Claim
134 words
A spring structure comprising a hollow substantially cylindrical tube formed solely of a non-metallic refractory material, said cylindrical tube having a plurality of n recesses extending transversely through sides of said cylindrical tube and a hollow interior space to inner surfaces of said cylindrical tube, said recesses having a dimension h along a longitudinal axis of said cylindrical tube, and said recesses being rotated from one another about said cylindrical tube by an angle 360°/n, said recesses being separated from one another along an exterior surface of said cylindrical tube parallel to said longitudinal axis by a distance e, said plurality of n recesses repeating one another over a distance T parallel to said longitudinal axis with successive recesses being separated by a distance T/n parallel to said longitudinal axis where e equals T/n.
Claim 11
Dependent Claim
14 words
A spring structure according to claim 8, wherein said non-metallic refractory material is quartz.
Claim 12
Dependent Claim
15 words
A spring structure according to claim 8, wherein said non-metallic refractory material is boron nitride.
Claim 13
Dependent Claim
14 words
A spring structure according to claim 8, wherein said non-metallic refractory material is graphite.
Claim 14
Dependent Claim
30 words
A spring structure according to claim 8, claim 18, claim 19, or claim 20, wherein said dimension h has a ratio h/e to said distance e equal to approximately 1.
Claim 15
Dependent Claim
22 words
A spring structure according to claim 8, claim 9, claim 10 or claim 11, wherein said cylindrical tube has an annular cross-section.
Claim 16
Dependent Claim
24 words
A spring structure according to claim 8, claim 9, claim 10, or claim 11, wherein said spring is used at temperatures exceeding 1000° C.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |