Patent US3971081A successfully refreshed from Google Patents.
US3971081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Box spring unit with metal slats
Assignee: Sealy Inc
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Filing: 1974-11-25
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Granted: 1976-07-27
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Expires: 1994-11-25
Abstract
Abstract A frame for a box spring unit utilizing torsion bar springs comprises a generally rectangular wood frame member and a plurality of parallel transverse metal slats secured to the frame member, the metal slats being adapted to precisely position and firmly secure the base of the torsion bar spring to the metal slat.
Inventors
- 👤 Richard C. Roe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:42
CPC Classifications
A; A47; A47C; A47C23/00; A47C23/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A frame for a box spring unit utilizing torsion bar springs comprising a generally rectangular wood frame member and a plurality of parallel transverse metal slats secured to said frame member, said slats having means to precisely position and firmly secure a torsion bar spring thereto, said metal slats providing the sole means of support for said torsion bar springs on said frame, said metal slats having an inverted U-shaped cross-section with leg portions extending downwardly, said leg portions having roll-back flanges extending upwardly along a part of said leg portions, said metal slats having a built-in crown.
Claim 2
Dependent Claim
98 words
A frame for a box spring unit utilizing torsion bar springs comprising a generally rectangular wood frame member and a plurality of parallel transverse metal slats secured to said frame member, said slats having means to precisely position and firmly secure a torsion bar spring thereto, said metal slats providing the sole means of support for said torsion bar springs on said frame, said metal slats having an inverted U-shaped cross-section with leg portions extending downwardly, said leg portions having roll-back flanges extending upwardly along a part of said leg portions, said metal slats having a built-in crown.
Claim 3
Dependent Claim
29 words
The frame of claim 1 wherein the ratio of height of the metal slats to height of the roll-back flanges is in the range of about 3.0 to 3.2.
Claim 4
Dependent Claim
98 words
A box spring unit comprising a generally rectangular wood frame member, a plurality of parallel transverse metal slats secured to said frame member and a plurality of torsion bar springs, said metal slats having means to precisely position and firmly secure a torsion bar spring thereto, said metal slats providing the sole means of support for said torsion bar springs on said frame, said metal slats having an inverted U-shaped cross-section with leg portions extending downwardly, said leg portions having roll-back flanges extending upwardly along a part of said leg portions, said metal slats having a built-in crown.
Claim 5
Dependent Claim
98 words
A box spring unit comprising a generally rectangular wood frame member, a plurality of parallel transverse metal slats secured to said frame member and a plurality of torsion bar springs, said metal slats having means to precisely position and firmly secure a torsion bar spring thereto, said metal slats providing the sole means of support for said torsion bar springs on said frame, said metal slats having an inverted U-shaped cross-section with leg portions extending downwardly, said leg portions having roll-back flanges extending upwardly along a part of said leg portions, said metal slats having a built-in crown.
Claim 6
Dependent Claim
31 words
The box spring unit of claim 3 wherein the ratio of height of the metal slats to height of the roll-back flanges is in the range of about 3.0 to 3.2.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |