Claims
- 1. 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.
- 2. 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.
- 3. 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.
- 4. 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.
Parent Case Info
This is a continuation of application Ser. No. 451,170, filed Mar. 14, 1974 now abandoned which is in turn a continuation of application Ser. No. 216,701, filed Jan. 10, 1972 now abandoned.
US Referenced Citations (7)
Continuations (2)
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Number |
Date |
Country |
Parent |
451170 |
Mar 1974 |
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Parent |
216701 |
Jan 1972 |
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