US4252302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable-thrust spring assembly
Assignee: Individual
•
Filing: 1979-05-18
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Granted: 1981-02-24
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Expires: 1999-05-18
Abstract
Abstract A spring assembly adapted for long-term installation in a limited space, in a minimum-stress condition. When thrust is desired, the assembly is activated by adjusting the position of some components, resulting in a tendency for the assembly to expand.
Inventors
- 👤 Daniel D. Musgrave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:05
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/18; F16F3/00; F16F3/02; F41; F41A; F41A9/00; F41A9/61; F41A9/64; F41A9/65; F41A9/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
An adjustable-thrust spring assembly comprising a stack of interleaved resilient leaf members, each member including: a pair of nested arcuate portions connected by a vertex; a long leaf extending from one of said pair; a short leaf extending from one of said pair; and a slot formed transversely through said member substantially at the junction of said short leaf and one of said pair, said slot in each said member having edge portions engaged with a long leaf of another said member whereby the height of said stack is minimized; each successive said member being installed in said stack in an orientation opposite to an adjacent said member; said stack including means for inserting wedge means between each said pair of arcuate portions thereby separating said pair and tending to expand said assembly in a predetermined direction.
Claim 2
Dependent Claim
137 words
An adjustable-thrust spring assembly comprising a stack of interleaved resilient leaf members, each member including: a pair of nested arcuate portions connected by a vertex; a long leaf extending from one of said pair; a short leaf extending from one of said pair; and a slot formed transversely through said member substantially at the junction of said short leaf and one of said pair, said slot in each said member having edge portions engaged with a long leaf of another said member whereby the height of said stack is minimized; each successive said member being installed in said stack in an orientation opposite to an adjacent said member; said stack including means for inserting wedge means between each said pair of arcuate portions thereby separating said pair and tending to expand said assembly in a predetermined direction.
Claim 3
Dependent Claim
23 words
An assembly as set forth in claim 1 wherein the resilience of said vertex is less than the resilience of said arcuate portions.
Claim 4
Dependent Claim
23 words
An assembly as set forth in claim 1 wherein said slot is slightly greater in length than the width of said long leaf.
Claim 5
Dependent Claim
19 words
An assembly as set forth in claim 1 wherein said long leaf is adapted to serve as said wedge.
Claim 6
Dependent Claim
13 words
An assembly as set forth in claim 1 and coated with a lubricant.
References Cited (Backward Citations)
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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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |