Patent US3556082A successfully refreshed from Google Patents.
US5368283A
Expired / Lapsed
US
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Torsion spring assembly with interlocking bushings
Assignee: Michigan Spring & Stamping Of Muskegon LLC
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Filing: 1993-08-05
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Granted: 1994-11-29
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Expires: 2013-08-05
Abstract
Abstract A torsion spring assembly particularly adapted for use in closing the throttle valve of an automotive throttle body. The assembly includes two bushings formed with sleeves adapted to telescope into the end portions of a torsion spring. As an incident thereto, the bushings automatically interlock with one another to hold the bushings and the spring in assembled relation.
Inventors
- 👤 Robert J. Pavlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:42
CPC Classifications
F; F02; F02D; F02D11/00; F02D11/04; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/0269
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A torsion spring assembly comprising a coiled helical torsion spring having a plurality of coils including two end coils, first and second bushings having first and second generally cylindrical sleeves, respectively, telescoped into the end coils of said spring, first and second annular flanges formed integrally with and projecting radially outwardly from the outboard ends of the sleeves of said first and second bushings, respectively, and located adjacent said end coils, first means formed integrally with said first sleeve, and second means formed integrally with said second sleeve and directly engaging said means on said first sleeve interiorly of said plurality of coils to restrict rotational and axial movement of said first bushing relative to said second bushing.
Claim 2
Dependent Claim
118 words
A torsion spring assembly comprising a coiled helical torsion spring having a plurality of coils including two end coils, first and second bushings having first and second generally cylindrical sleeves, respectively, telescoped into the end coils of said spring, first and second annular flanges formed integrally with and projecting radially outwardly from the outboard ends of the sleeves of said first and second bushings, respectively, and located adjacent said end coils, first means formed integrally with said first sleeve, and second means formed integrally with said second sleeve and directly engaging said means on said first sleeve interiorly of said plurality of coils to restrict rotational and axial movement of said first bushing relative to said second bushing.
Claim 3
Dependent Claim
35 words
A torsion spring assembly as defined in claim 1 in which said means on said sleeves are shaped to interlock with a snap fit when the inboard ends of said sleeves are moved axially together.
Claim 4
Dependent Claim
58 words
A torsion spring assembly as defined in claim 2 in which said means comprise first and second fingers projecting axially from said sleeves of said first and second bushings, respectively, and first and second grooves formed in the sleeves of said first and second bushings, respectively, and sized to receive said fingers with a snug but slidable fit.
Claim 5
Dependent Claim
35 words
A torsion spring assembly as defined in claim 3 further including axially projecting means located near the center of the sleeve of each bushing and adapted to telescope into the sleeve of the other bushing.
Claim 6
Dependent Claim
24 words
A torsion spring assembly as defined in claim 4 in which said axially projecting means of each bushing is shaped substantially as a half-cylinder.
Claim 7
Dependent Claim
18 words
A torsion spring assembly as defined in claim 5 in which said first and second bushings are identical.
Claim 8
Dependent Claim
20 words
A torsion spring assembly as defined in claim 3 including detents formed on each finger and formed in each groove.
Claim 9
Dependent Claim
18 words
A torsion spring assembly as defined in claim 1 in which said first and second bushings are identical.
Claim 10
Dependent Claim
37 words
A torsion spring assembly as defined in claim 1 in which said means on said sleeves are configured and dimensioned to permit axial movement of said first bushing relative to said second bushing through a limited range.
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) | 1997-11-28 | 1998-05-30 | 1998-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-28 | 2002-05-30 | 2002-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-28 | 2006-05-30 | 2006-11-29 | $7700.00 | Window Closed / Lapsed |