Patent US4660811A successfully refreshed from Google Patents.
US4660811A
Expired / Lapsed
US
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Synthetic-resin compression spring
Assignee: Ringfeder GmbH
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Filing: 1985-08-07
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Granted: 1987-04-28
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Expires: 2005-08-07
Abstract
Abstract A spring according to this invention has a core of an elastically deformable but substantially incompressible material and having two axially spaced end surfaces operatively engageable with objects to be relatively resiliently mounted. Thus when the two bodies engaging the end surfaces move toward each other the core swells radially. An annular belt formed of an elastic synthetic resin snugly surrounds the core between its ends. The belt can be lapped or can be a single unitary ring. It may also be formed of a plurality of independent layers having ends provided with a heat-shrunk clip for securing the ends together. To soften the initial spring characteristic the belt is corrugated and has peaks engaging the core and valleys normally not engaging the core. The corrugations may run longitudinally or transversely.
Inventors
- 👤 Dieter Muhlhahn
- 👤 Gino Marsella
- 👤 Friedhelm Detzner
- 👤 Dieter Simons
- 👤 Horst-Dieter Schafer
- 👤 Hermann Haarkotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:20
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/20; F; F16; F16F; F16F3/00; F16F3/08; F16F3/087
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A compression spring comprising: a core of an elastically deformable but substantially incompressible material and having two axially spaced end surfaces operatively engageable with objects to be relatively resiliently mounted, whereby when the two bodies engaging the end surfaces move toward each other the core swells radially; and an annular belt snugly circumferentially surrounding the core between its end surfaces and formed of an elastic and circuferentially oriented synthetic resin, the end surfaces projecting mainly axially past the belt such that on radial swelling of the core the belt is tensioned substantially only circumferentially.
Claim 2
Dependent Claim
94 words
A compression spring comprising: a core of an elastically deformable but substantially incompressible material and having two axially spaced end surfaces operatively engageable with objects to be relatively resiliently mounted, whereby when the two bodies engaging the end surfaces move toward each other the core swells radially; and an annular belt snugly circumferentially surrounding the core between its end surfaces and formed of an elastic and circuferentially oriented synthetic resin, the end surfaces projecting mainly axially past the belt such that on radial swelling of the core the belt is tensioned substantially only circumferentially.
Claim 3
Dependent Claim
33 words
The spring defined in claim 1 wherein the belt is formed of a single unitary band wrapped in a multiplicity of turns around the core and having an outer end fastened to itself.
Claim 4
Dependent Claim
16 words
The spring defined in claim 1 wherein the belt is formed as a single unitary ring.
Claim 5
Dependent Claim
29 words
The spring defined in claim 1 wherein the belt is formed of a plurality of independent layers having ends and is provided with means for securing the ends together.
Claim 6
Dependent Claim
34 words
The spring defined in claim 2 wherein the belt is corrugated and has peaks engaging the core and valleys normally not engaging the core, whereby the initial spring characteristic of the spring is low.
Claim 7
Dependent Claim
32 words
The spring defined in claim 1 wherein the belt has a radially outwardly directed surface engaging the belt in surface contact and having a formation axially linking the belt to the core.
Claim 8
Dependent Claim
23 words
The spring defined in claim 6 wherein the formation is a radially outwardly projecting ridge and the belt is generally of complementary U-section.
Claim 9
Dependent Claim
23 words
The spring defined in claim 6 wherein the formation is a radially outwardly concave groove and the belt is generally of complementary U-section.
Claim 10
Dependent Claim
17 words
The spring defined in claim 1 wherein the belt has an inner surface bonded to the core.
Claim 11
Dependent Claim
24 words
The spring defined in claim 1 wherein the core is axially longer than the belt so that its end surfaces project past the belt.
Claim 12
Dependent Claim
33 words
The spring defined in claim 1 wherein the belt has end surfaces having radially inner portions coterminous with the end surfaces of the core and radially outer portions tapering toward each other therefrom.
Claim 13
Dependent Claim
44 words
The spring defined in claim 1 wherein the belt has an inner edge at the core and the core has an outer edge, one of the edges being chamfered, whereby the core and belt can be fitted together with the chamfered edge fitting first.
Claim 14
Dependent Claim
42 words
The spring defined in claim 1, further comprising: a housing having an end wall engaging one of the end surfaces and a side wall annularly surrounding the belt and core; and a radially compressible guide between the belt and the side wall.
Claim 15
Dependent Claim
26 words
The spring defined in claim 13 wherein the radially compressible guide is integrally formed with the belt and is itself formed with axially throughgoing empty passages.
Claim 16
Dependent Claim
19 words
The spring defined in claim 13, further comprising a low-friction guide sleeve between the guide and the side wall.
Claim 17
Dependent Claim
18 words
The spring defined in claim 13 wherein the guide is integral with and axially shorter than the belt.
Claim 18
Dependent Claim
61 words
The spring defined in claim 1 wherein the core is annular and formed with an axially throughgoing passage, the spring further comprising: a housing having an end plate flatly axially engaging one of the end surfaces of the core and a post projecting axially through the passage of the core; and a radially compressible guide between the core and the post.
Claim 19
Dependent Claim
46 words
The spring defined in claim 1 wherein a plurality of such springs axially operatively abut one another and are formed with an axially throughgoing passage, the spring further comprising: a post axially traversing the passages of the springs; and rigid washers engaged axially between the cores.
Claim 20
Dependent Claim
30 words
The spring defined in claim 18 wherein the washers have surfaces with low coefficients of friction and the end surfaces of the springs have collars axially abutting through the washers.
Claim 21
Dependent Claim
124 words
A compression spring comprising: a core of an elastically deformable but substantially incompressible material and having two axially spaced end faces operatively engageable with objects to be relatively resiliently mounted and a radially outwardly directed outer surface, whereby when the two bodies engaging the end surfaces move toward each other the core swells radially; an annular belt snugly surrounding the core between its end faces, having a radially inwardly directed inner surface radially engaging the outer surface of the core, and formed of an elastic synthetic resin; and a radially projecting formation on one of the surfaces, the other surface being formed with a complementary radially open recess receiving the formation, whereby the interfitting projection and recess axially lock the core and belt together.
Claim 22
Dependent Claim
124 words
A compression spring comprising: a core of an elastically deformable but substantially incompressible material and having two axially spaced end faces operatively engageable with objects to be relatively resiliently mounted and a radially outwardly directed outer surface, whereby when the two bodies engaging the end surfaces move toward each other the core swells radially; an annular belt snugly surrounding the core between its end faces, having a radially inwardly directed inner surface radially engaging the outer surface of the core, and formed of an elastic synthetic resin; and a radially projecting formation on one of the surfaces, the other surface being formed with a complementary radially open recess receiving the formation, whereby the interfitting projection and recess axially lock the core and belt together.
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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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |