US6170808B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring core for mattress or cushion
Assignee: Individual
•
Filing: 1998-09-21
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Granted: 2001-01-09
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Expires: 2018-09-21
Abstract
Abstract The invention relates to a spring core for mattresses and seat cushions with leaf springs. The spring core consists of a plurality of spring elements bent up out of passages punched in a plate, with each spring element having an upper and a lower spring clip, with the upper spring clip bent up out of a passage punched in the lower spring clip. The spring elements can also be coated with extruded foam.
Inventors
- 👤 Franz Kutschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:12
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/04; A47C27/06; A47C27/065; A47C27/14; A47C27/142; A47C27/144; A47C27/146; A47C27/16; A47C27/20; F; F16; F16F; F16F1/00; F16F1/02; F16F1/18; F16F1/185; F16F3/00; F16F3/02; F16F3/08; F16F3/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
A leaf spring core for mattresses and seat cushions comprising: a plurality of spring elements bent up out of passages punched in a plate, including a plurality of lower spring clips bent up out of first pairs of said passages punched in said plate and a plurality of upper spring clips bent up out of second pairs of said passages punched in said lower spring clips, and a coating of foam, wherein said plurality of spring elements contain interior portions which are free of said foam and said plurality of lower spring clips and said plate define a plurality of lower exterior spaces that are also free of said foam.
Claim 2
Dependent Claim
110 words
A leaf spring core for mattresses and seat cushions comprising: a plurality of spring elements bent up out of passages punched in a plate, including a plurality of lower spring clips bent up out of first pairs of said passages punched in said plate and a plurality of upper spring clips bent up out of second pairs of said passages punched in said lower spring clips, and a coating of foam, wherein said plurality of spring elements contain interior portions which are free of said foam and said plurality of lower spring clips and said plate define a plurality of lower exterior spaces that are also free of said foam.
Claim 3
Dependent Claim
22 words
The leaf spring core of claim 1 , wherein: said spring elements are spaced apart on said plate in a linear arrangement.
Claim 4
Independent Claim
122 words
A method of forming a leaf spring core, comprising the steps of: producing a plate with at least one set of passages, each set defining first and second portions of said plate; forming a lower spring clip by bending said first portion; forming an upper spring clip by bending said second portion attached to said first portion, wherein said lower spring clip and said upper spring clip form a spring element; defining an interior space formed between said lower spring clip and said upper spring clip; defining an exterior space formed between said lower spring clip and said plate; coating said spring element with foam; leaving said interior space essentially free of foam; and leaving said exterior space essentially free of foam.
Claim 5
Independent Claim
122 words
A method of forming a leaf spring core, comprising the steps of: producing a plate with at least one set of passages, each set defining first and second portions of said plate; forming a lower spring clip by bending said first portion; forming an upper spring clip by bending said second portion attached to said first portion, wherein said lower spring clip and said upper spring clip form a spring element; defining an interior space formed between said lower spring clip and said upper spring clip; defining an exterior space formed between said lower spring clip and said plate; coating said spring element with foam; leaving said interior space essentially free of foam; and leaving said exterior space essentially free of foam.
Claim 6
Dependent Claim
20 words
The method of claim 3 , wherein the step of producing a plate includes punching said passages from said plate.
Claim 7
Dependent Claim
118 words
A spring core for mattresses and cushions, comprising: a plurality of separate spring elements arranged on a plate in a planar configuration and separated from each other by a space, each of said spring elements including: a lower spring clip approximately shaped as a leaf spring; an upper spring clip approximately shaped as an inverted leaf spring and attached to said lower spring clip; a coating of foam; an interior formed between said lower spring clip and said upper spring clip and an exterior space between said lower spring clip and said plate being substantially free of said foam, wherein said upper spring clip and said lower spring clip are formed from a single planar piece of material.
Claim 8
Dependent Claim
118 words
A spring core for mattresses and cushions, comprising: a plurality of separate spring elements arranged on a plate in a planar configuration and separated from each other by a space, each of said spring elements including: a lower spring clip approximately shaped as a leaf spring; an upper spring clip approximately shaped as an inverted leaf spring and attached to said lower spring clip; a coating of foam; an interior formed between said lower spring clip and said upper spring clip and an exterior space between said lower spring clip and said plate being substantially free of said foam, wherein said upper spring clip and said lower spring clip are formed from a single planar piece of material.
Claim 9
Independent Claim
105 words
A method of forming a spring core, comprising the steps of: producing a plate with at least one set of passages, each set of passages defining a spring-producing area; forming a lower spring clip by bending a first portion of said spring-producing area; forming an upper spring clip by bending a second portion of said spring-producing area attached to said first portion; defining an interior formed between said lower spring clip and said upper spring clip; surrounding said spring element with foam; leaving said interior essentially free of foam; and leaving an area between said lower spring clip and said plate essentially free of foam.
Claim 10
Independent Claim
105 words
A method of forming a spring core, comprising the steps of: producing a plate with at least one set of passages, each set of passages defining a spring-producing area; forming a lower spring clip by bending a first portion of said spring-producing area; forming an upper spring clip by bending a second portion of said spring-producing area attached to said first portion; defining an interior formed between said lower spring clip and said upper spring clip; surrounding said spring element with foam; leaving said interior essentially free of foam; and leaving an area between said lower spring clip and said plate essentially free of foam.
Claim 11
Dependent Claim
32 words
The method of claim 6 , wherein the step of forming a lower spring clip further includes the step of bending a first portion of said spring-producing area attached to said plate.
Claim 12
Dependent Claim
20 words
The method of claim 6 , wherein the step of producing a plate includes punching said passages from said plate.
References Cited (Backward Citations)
US88070A
Cited
US147247A
Cited
US1630459A
Cited
US2277853A
Cited
US2313171A
Cited
US2433012A
Cited
US3506295A
Cited
US3633228A
Cited
US3765038A
Cited
US3879025A
Cited
US3974532A
Cited
US4154786A
Cited
GB2055173A
Cited
US4713854A
Cited
US4935977A
Cited
US5409200A
Cited
US5632473A
Cited
AT399994B
Cited
GB2287187A
Cited
US5785303A
Cited
US5747140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-09 | 2004-07-10 | 2005-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-09 | 2008-07-10 | 2009-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-09 | 2012-07-10 | 2013-01-09 | $7700.00 | Window Closed / Lapsed |