US3688320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring units for furniture
Assignee: SILIENTNIGHT Ltd
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Filing: 1971-01-19
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Granted: 1972-09-05
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Expires: 1991-01-19
Abstract
Abstract A spring unit for furniture in which a plurality of helical springs are disposed on parallel axes in which adjacent upper and lower helices are integrated by channel elements having opposed legs of the spring into tangential, gripping relation to the helices; the channel elements having free ends isolating the spring effect, and in which the channel elements are produced from an extruded plastic material.
Inventors
- 👤 Roderick James Hartley
- 👤 George Charters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:38
CPC Classifications
A; A47; A47C; A47C23/00; A47C23/007; A47C23/04; A47C23/05; A47C27/00; A47C27/04; A47C27/06; A47C27/066; A47C27/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A spring unit for use in an article of furniture comprising an array of helical springs disposed on spaced, vertical, parallel axes, the upper and lower helices of said springs normally being disposed in the same upper and lower plane, the improvement consisting of elongated channel elements having opposed upper and lower integral webs normally urged together, said channel element webs embracingly enagaging in tangential relation adjacent upper and lower helices whereby said springs are retained in operative relation as a unit.
Claim 2
Dependent Claim
82 words
A spring unit for use in an article of furniture comprising an array of helical springs disposed on spaced, vertical, parallel axes, the upper and lower helices of said springs normally being disposed in the same upper and lower plane, the improvement consisting of elongated channel elements having opposed upper and lower integral webs normally urged together, said channel element webs embracingly enagaging in tangential relation adjacent upper and lower helices whereby said springs are retained in operative relation as a unit.
Claim 3
Dependent Claim
46 words
The structure as claimed in claim 1 in which said helical springs are disposed in a rectangular array comprising parallel rows of said springs, said array of springs being assembled by means of eight of said elongated channel elements, said channel elements terminating in free ends.
Claim 4
Dependent Claim
18 words
The structure as claimed in claim 1 in which said channel elements comprise an extruded, synthetic plastic material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |