US3767180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil spring lock
Assignee: Individual
•
Filing: 1971-06-17
•
Granted: 1973-10-23
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Expires: 1991-06-17
Abstract
Abstract An upholstery spring is disclosed, consisting of a length of wire helically coiled with the end convolutions closed to define two circles. The wire ends are wrapped about the adjacent turn at points where an obtuse elbow is located. The wire end crosses inwardly against the elbow and then wraps around the wire immediately adjacent the bend, to trap one leg of the elbow between the wrapped end and the portion crossing inwardly against the elbow, thereby preventing the wire end from slipping on the adjacent turn.
Inventors
- 👤 M Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:29
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; A; A47; A47C; A47C27/00; A47C27/04; A47C27/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
An upholstery spring comprising a single length of wire having two ends and configured to define a substantially helical spring, the helical spring including a plurality of convolutions, of which an end convolution is closed to define an end coil of substantially circular shape lying substantially in a single plane, the end coil being closed by having the respective end of the wire wrapped about the wire where the end coil merges with the adjacent convolution, the portion of the wire which links the end coil with the adjacent convolution being bent obliquely away from the plane of the end coil to define an obtuse angle at the point of merging, one arm of the obtuse angle lying in said plane, the portion of the wire immediately adjacent said respective end of the wire being bent inwardly in said plane so as to abut said obtuse angle, the end of the wire being wrapped tightly in a helix of the opposite sense from the helix of the spring at least two full turns around the wire in the end coil immediately adjacent said obtuse angle.
Claim 2
Dependent Claim
185 words
An upholstery spring comprising a single length of wire having two ends and configured to define a substantially helical spring, the helical spring including a plurality of convolutions, of which an end convolution is closed to define an end coil of substantially circular shape lying substantially in a single plane, the end coil being closed by having the respective end of the wire wrapped about the wire where the end coil merges with the adjacent convolution, the portion of the wire which links the end coil with the adjacent convolution being bent obliquely away from the plane of the end coil to define an obtuse angle at the point of merging, one arm of the obtuse angle lying in said plane, the portion of the wire immediately adjacent said respective end of the wire being bent inwardly in said plane so as to abut said obtuse angle, the end of the wire being wrapped tightly in a helix of the opposite sense from the helix of the spring at least two full turns around the wire in the end coil immediately adjacent said obtuse angle.
Claim 3
Dependent Claim
27 words
An upholstery spring as claimed in claim 1, in which both end convolutions are closed to define end coils, the end coils lying in spaced parallel planes.
Claim 4
Dependent Claim
24 words
An upholstery spring as claimed in claim 2, in which the convolutions intermediate the end coils are of smaller diameter than the end coils.
Claim 5
Dependent Claim
31 words
An upholstery spring as claimed in claim 1, in which the helix of the spring is a clockwise helix while the helix of the wrapped wire end is a counter-clockwise helix.
Claim 6
Dependent Claim
32 words
An upholstery spring as claimed in claim 1, in which the portion of the end coil immediately adjacent the obtuse angle is bent slightly inwardly away from circularity and is substantially straight.
Claim 7
Dependent Claim
44 words
An upholstery spring as claimed in claim 3, in which the helix of the spring is a clockwise helix, and in which the portion of the end coil immediately adjacent the obtuse angle is bent slightly inwardly away from circularity and is substantially straight.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |