Patent US4588175A successfully refreshed from Google Patents.
US4588175A
Expired / Lapsed
US
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Torsion spring apparatus and method
Assignee: MARTIN DOOR MANUFACTURING A CORP OF UT
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Filing: 1984-10-12
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Granted: 1986-05-13
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Expires: 2004-10-12
Abstract
Abstract The present invention relates to a novel torsion spring apparatus and method wherein anchor loops are formed in the end coil of the torsion spring to permit anchoring the spring directly to the appropriate mounting bracket. The provision of anchor loops in the end coil of the torsion spring effectively eliminates the requirement for conventional mounting inserts for the torsion spring and simultaneously increases the effective length of the torsion spring or, alternatively, permits the torsion spring to be shortened by the number of coils that would be otherwise rendered ineffective by the presence of a prior art insert.
Inventors
- 👤 David O. Martin
- 👤 Lawrence G. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:29
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/14; F16F1/16; F16F1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A torsion spring apparatus and mounting assembly comprising: a bracket for mounting to a surface and comprising a slot; a support rod; bearing means on the support rod for mounting the support rod in the slot of the bracket in rotatable relationship to the bracket; a torsion spring apparatus mounted over the support rod on each side of the bracket; and securement means on the torsion spring for mounting the torsion spring to the bracket comprising anchor loops formed in the adjacent end of the torsion spring.
Claim 2
Dependent Claim
87 words
A torsion spring apparatus and mounting assembly comprising: a bracket for mounting to a surface and comprising a slot; a support rod; bearing means on the support rod for mounting the support rod in the slot of the bracket in rotatable relationship to the bracket; a torsion spring apparatus mounted over the support rod on each side of the bracket; and securement means on the torsion spring for mounting the torsion spring to the bracket comprising anchor loops formed in the adjacent end of the torsion spring.
Claim 3
Dependent Claim
39 words
The torsion spring and mounting assembly defined in claim 1 wherein the bearing means comprises a sleeve and a cylinder mounted to the sleeve, the cylinder comprising notches for engagedly receiving the edges of the slot in the bracket.
Claim 4
Dependent Claim
31 words
The torsion spring and mounting assembly defined in claim 2 wherein the sleeve comprises a metallic member having diametrally enlarged ends and the cylinder comprises a plastic molded to the sleeve.
Claim 5
Dependent Claim
53 words
The torsion spring apparatus and mounting assembly defined in claim 1 wherein the securement means for each torsion spring comprises a pair of diametrally opposed loops formed in the last coil of the torsion spring, each loop serving as a bolt-receiver for a bolt passing through a corresponding adjacent hole in the bracket.
Claim 6
Dependent Claim
121 words
A torsion spring and mounting assembly comprising: a bracket comprising an L-shaped member having a foot and an upright, the foot having holes therein for securing the bracket to a surface, the upright having an open slot and a pair of bolt-receiving holes; a support rod; bearing means for mounting the support rod in the slot in rotatable relation to the bracket; a first torsion spring and a second torsion spring mounted to the support rod on each side of the bracket; and mounting means for mounting each torsion spring to the bracket comprising a pair of bolt-receiving loops formed in adjacent ends of the last coil of each torsion spring, each loop corresponding to a bolt-receiving hole in the bracket.
Claim 7
Dependent Claim
121 words
A torsion spring and mounting assembly comprising: a bracket comprising an L-shaped member having a foot and an upright, the foot having holes therein for securing the bracket to a surface, the upright having an open slot and a pair of bolt-receiving holes; a support rod; bearing means for mounting the support rod in the slot in rotatable relation to the bracket; a first torsion spring and a second torsion spring mounted to the support rod on each side of the bracket; and mounting means for mounting each torsion spring to the bracket comprising a pair of bolt-receiving loops formed in adjacent ends of the last coil of each torsion spring, each loop corresponding to a bolt-receiving hole in the bracket.
Claim 8
Dependent Claim
39 words
The torsion spring and mounting assembly defined in claim 5 wherein the bearing means comprises a sleeve and a cylinder mounted to the sleeve, the cylinder comprising notches for engagedly receiving the edges of the slot in the bracket.
Claim 9
Dependent Claim
31 words
The torsion spring and mounting assembly defined in claim 6 wherein the sleeve comprises a metallic member having diametrally enlarged ends and the cylinder comprises a plastic molded to the sleeve.
References Cited (Backward Citations)
US1872872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |