US4830348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppressing device for coil springs
Assignee: Perfection Spring and Stamping Corp
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Filing: 1988-02-17
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Granted: 1989-05-16
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Expires: 2008-02-17
Abstract
Abstract A noise suppressing device for a coil spring, and the combination of a spring equipped with such a device, in which the noise suppressing device takes the form of at least one spring metal sleeve of arcuate C-shaped cross section extending about and tightly engaging a portion of the spring intermediate the length thereof. A lug portion of the sleeve projects into the spacing between a pair of adjacent coils and limits the extent of sliding movement of the sleeve along such coils as the spring expands and contracts.
Inventors
- 👤 Peter G. Seyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:15
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/12; F16F1/13
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
219 words
In combination, a tension coil spring having a longitudinal axis and having a coiled portion of generally cylindrical configuration with a multiplicity of coils of equal size; a spring metal sleeve of arcuate C-shaped transverse cross section coaxial with said spring and having an axial length constituting a minor portion of the length of said coiled portion of said spring but being at least equal to the axial length of one full coil of said spring when said spring is in tensioned state in normal use; said sleeve in an unexpanded, untensioned state having an inside diameter less than the outside diameter of said spring and being disposed externally about said coiled portion of said spring intermediate the length thereof and in tight frictional engagement therewith; said sleeve having a pair of generally longitudinally-extending side edges spaced apart to define a spring-insertion opening therebetween and said sleeve being constructed and arranged for radially-directed attachment of said sleeve to said spring through said opening without expansion of said sleeve beyond its elastic limit; said sleeve also having substantially its entire inner surface disposed at or beyond the outermost radial limits of said cylindrical coiled portion of said spring; and said side edges of said sleeve projecting beyond a longitudinal axial plane of said spring when said sleeve is fitted thereon.
Claim 2
Dependent Claim
219 words
In combination, a tension coil spring having a longitudinal axis and having a coiled portion of generally cylindrical configuration with a multiplicity of coils of equal size; a spring metal sleeve of arcuate C-shaped transverse cross section coaxial with said spring and having an axial length constituting a minor portion of the length of said coiled portion of said spring but being at least equal to the axial length of one full coil of said spring when said spring is in tensioned state in normal use; said sleeve in an unexpanded, untensioned state having an inside diameter less than the outside diameter of said spring and being disposed externally about said coiled portion of said spring intermediate the length thereof and in tight frictional engagement therewith; said sleeve having a pair of generally longitudinally-extending side edges spaced apart to define a spring-insertion opening therebetween and said sleeve being constructed and arranged for radially-directed attachment of said sleeve to said spring through said opening without expansion of said sleeve beyond its elastic limit; said sleeve also having substantially its entire inner surface disposed at or beyond the outermost radial limits of said cylindrical coiled portion of said spring; and said side edges of said sleeve projecting beyond a longitudinal axial plane of said spring when said sleeve is fitted thereon.
Claim 3
Dependent Claim
35 words
The combination of claim 1 in which said sleeve includes a stop portion projecting inwardly into the spacing between adjacent coils to limit the extent of longitudinal sliding movement of said sleeve along said spring.
Claim 4
Dependent Claim
25 words
The combination of claims 1 or 2 in which said sleeve has an axial length no greater than its outside diameter in an untensioned state.
Claim 5
Dependent Claim
30 words
The combination of claims 1 or 2 in which said sleeve has an inside diameter 5 to 8% smaller than the outside diameter of said spring in an untensioned state.
Claim 6
Dependent Claim
29 words
The combination of claims 1 or 2 in which said sleeve has an axial length equal to at least two full coils of said spring in an untensioned state.
Claim 7
Dependent Claim
27 words
The combination of claim 5 in which said sleeve has an axial length equal to at least three full coils of said spring in an untensioned state.
Claim 8
Dependent Claim
37 words
The combination of claims 1 or 2 in which said longitudinal side edges are substantially parallel with said longitudinal axis of said spring; said sleeve having a cross-sectional angular dimension within the range of 270° to 310°.
Claim 9
Dependent Claim
21 words
The combination of claim 7 in which said sleeve has an angular dimension within the range of about 280° to 300°.
Claim 10
Dependent Claim
16 words
The combination of claim 8 in which said sleeve has an angular dimension of approximately 290°.
Claim 11
Dependent Claim
62 words
The combination of claims 1 or 2 in which said frictional engagement between said spring and said sleeve occurs along three primary zones of contact; two of said primary zones of contact being located along said side edges of said sleeve and the third primary zone of contact being disposed along said inner surface of said sleeve equidistant from said side edges.
Claim 12
Dependent Claim
32 words
The combination of claims 1 or 2 in which said sleeve includes an integral arcuate rib located intermediate the axial length of said sleeve and extending between said pair of side edges.
Claim 13
Dependent Claim
37 words
The combination of claims 1 or 2 in which a second sleeve identical to said first-mentioned sleeve is fitted about said coiled portion of said spring; said first and second sleeves being spaced apart from each other.
Claim 14
Dependent Claim
47 words
The combination of claim 12 in which said combination includes a pair of vehicle body elements connected to opposite ends of said spring; one of said elements being movable in relation to the other of said elements and being counterbalanced by the tensioning force of said spring.
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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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |