Patent US5917810A successfully refreshed from Google Patents.
Patent US3645523A successfully refreshed from Google Patents.
US3645523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seat spring unit
Assignee: Hoover Group Inc
•
Filing: 1970-01-27
•
Granted: 1972-02-29
•
Expires: 1990-01-27
Abstract
Abstract A seat spring unit mounted on horizontally spaced frame rails and consisting of upper and lower connected spring members. The upper spring member forms the primary load support section for the spring unit and includes a return bent upon itself section at its rear end which is supported on the lower spring member. This construction thus adapts the spring unit for supporting light loads wherein the entire resistance to the load is taken up by the upper spring member, the return bent section of which provides increased comfort for the seat occupant in the occupant''s tail bone area where principal support is necessary for comfort. When heavier loads are applied to the spring unit, the lower spring member provides additional resilient resistance to load after the upper spring member has been deflected, thus enabling construction of seating units capable of comfortably supporting occupants whose weights vary over a wide range.
Inventors
- 👤 Harold I Mcmahon
- 👤 Albin J Niewulis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:01
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/28; A47C7/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
159 words
In a seating structure which includes a pair of frame rails, a spring unit supported on and extending between said rails, said spring unit having vertically spaced primary and secondary loadsupporting sections, each of said supporting sections including a plurality of connected torsion bars, said primary section having an end portion supported on and disposed above said secondary section, said end portion being return bent upon itself so that it is inclined downwardly toward said secondary section in a direction away from the adjacent frame rail, said end portion terminating in a plurality of torsion bars positioned adjacent to and connected to torsion bars in said secondary section the ends of said secondary section being connected to said frame rails and a main portion thereof being arranged in a supporting relation with said end portion of said primary section, said secondary section including an upwardly inclined end portion located between said primary end portion and said adjacent frame rail.
Claim 2
Dependent Claim
159 words
In a seating structure which includes a pair of frame rails, a spring unit supported on and extending between said rails, said spring unit having vertically spaced primary and secondary loadsupporting sections, each of said supporting sections including a plurality of connected torsion bars, said primary section having an end portion supported on and disposed above said secondary section, said end portion being return bent upon itself so that it is inclined downwardly toward said secondary section in a direction away from the adjacent frame rail, said end portion terminating in a plurality of torsion bars positioned adjacent to and connected to torsion bars in said secondary section the ends of said secondary section being connected to said frame rails and a main portion thereof being arranged in a supporting relation with said end portion of said primary section, said secondary section including an upwardly inclined end portion located between said primary end portion and said adjacent frame rail.
Claim 3
Dependent Claim
45 words
A seating structure according to claim 1 wherein said secondary section includes a second upwardly extending end portion terminating in a foot supported on the other one of said frame rails, and wherein said primary section has a second end portion supported on said foot.
Claim 4
Dependent Claim
100 words
A spring unit comprising upper and lower vertically spaced spring members, said upper spring member having a main load support section and being return bent downwardly upon itself at one end of said section so as to have an inclined portion extended under said load support section, said upper member being secured at its ends to said lower member, said lower spring member having a main section engaged with said inclined portion of said upper spring member and upwardly extending end sections one of which is adjacent to and spaced horizontally from said inclined portion of said upper spring member.
Claim 5
Dependent Claim
100 words
A spring unit comprising upper and lower vertically spaced spring members, said upper spring member having a main load support section and being return bent downwardly upon itself at one end of said section so as to have an inclined portion extended under said load support section, said upper member being secured at its ends to said lower member, said lower spring member having a main section engaged with said inclined portion of said upper spring member and upwardly extending end sections one of which is adjacent to and spaced horizontally from said inclined portion of said upper spring member.
Claim 6
Dependent Claim
58 words
A spring unit according to claim 3 wherein the other one of said lower spring member end sections terminates in a foot, means securing one end of said upper spring member to said foot, and means securing the opposite end of said upper spring member to said lower spring member main section adjacent to said one end section.
Claim 7
Dependent Claim
58 words
A spring unit according to claim 4 wherein said upper and lower spring members include horizontally spaced torsion bars, the torsion bars at the ends of said upper spring member being engaged with disposed in a side-by-side relation with some of the torsion bars in said lower spring member, and clip means securing said side-by-side torsion bars together.
Claim 8
Dependent Claim
30 words
A spring unit according to claim 5 wherein said load-support section of said upper spring member and said main section of said lower spring member are substantially coextensive in length.
References Cited (Backward Citations)
US2591185A
Cited
US3361423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |