US3905403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of manufacturing dual interlocked safety spring assemblies
Assignee: Kuhlman Corp
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Filing: 1974-10-29
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Granted: 1975-09-16
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Expires: 1994-10-29
Abstract
Abstract Methods for manufacturing a dual interlocked safety spring assembly for minimizing the dangers resulting from spring breakage, in which two or more springs operating primarily in parallel are interlocking along their length so that upon the breakage of one of the two springs at a point, the broken spring will interlock with the intact spring and still contribute significantly to the magnitude of the remaining total spring force, and methods and machines for the manufacture of such springs.
Inventors
- 👤 Woodrow Wilson Smith
- 👤 David Jack Youngquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:18
CPC Classifications
B; B21; B21F; B21F3/00; B21F3/12; B21F35/00; B21F35/003; B21F35/02; F; F16; F16F; F16F3/00; F16F3/02; F16F3/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
The method of forming a dual safety interlocked tension spring which comprises the steps of forming a first coil spring, forming a second coil spring of similar pitch and size to said first coil spring, positioning the springs end to end, inserting an end portion of the end turn of one of the springs under an end portion of the adjacent end turn of the other of the springs, and rotating the two springs relative to one another substantially about a longitudinal axis of one of the springs to screw the springs together the full lengths thereof.
Claim 2
Independent Claim
97 words
The method of forming a dual safety interlocked tension spring which comprises the steps of forming a first coil spring, forming a second coil spring of similar pitch and size to said first coil spring, positioning the springs end to end, inserting an end portion of the end turn of one of the springs under an end portion of the adjacent end turn of the other of the springs, and rotating the two springs relative to one another substantially about a longitudinal axis of one of the springs to screw the springs together the full lengths thereof.
Claim 3
Dependent Claim
21 words
The method of claim 1 further including the step of forming a hook on each end of each of the springs.
Claim 4
Independent Claim
131 words
The method of forming a dual safety interlock tension spring having connecting means at each end thereof and connectible between two points in an apparatus to exert tension forces therebetween which comprises the steps of positioning two substantially straight spring wires in substantial parallelism and in preselected positional relationship to each other, advancing an initial length of the wires to establish a straight length, forming the two spring wires starting at a point following the straight wire length concurrently into a substantially single-layer double-wound coil while substantially maintaining said preselected positional relationship between the wires during the coiling, and severing the wires at a point spaced from the completion end of the coil to establish a further straight length, and forming all four of the straight lengths to a connecting configuration.
Claim 5
Independent Claim
131 words
The method of forming a dual safety interlock tension spring having connecting means at each end thereof and connectible between two points in an apparatus to exert tension forces therebetween which comprises the steps of positioning two substantially straight spring wires in substantial parallelism and in preselected positional relationship to each other, advancing an initial length of the wires to establish a straight length, forming the two spring wires starting at a point following the straight wire length concurrently into a substantially single-layer double-wound coil while substantially maintaining said preselected positional relationship between the wires during the coiling, and severing the wires at a point spaced from the completion end of the coil to establish a further straight length, and forming all four of the straight lengths to a connecting configuration.
Claim 6
Dependent Claim
17 words
The method according to claim 3 in which said preselected positional relationship is in side-by-side close proximity.
Claim 7
Dependent Claim
16 words
The method according to claim 3 in which said preselected positional relationship is in side-by-side abutment.
Claim 8
Dependent Claim
93 words
The method according to claim 3 in which the straight lengths extend generally tangentially to the coil, and in which the last mentioned step of forming all four of the straight lengths to a connecting configuration includes the steps of concurrently bending the straight length at one end of both wires substantially 90* about a radius and in the region of the tangency to project those wires in the general direction of the longitudinal axes of the coils, and concurrently forming a hook at each of the ends of the bent straight length.
Claim 9
Dependent Claim
82 words
The method according to claim 6 in which the step of forming all four of the straight lengths to a connecting configuration further includes the step of concurrently bending the straight length at the other end of both wires substantially 90* about a radius and in the region of the tangency to project tHose wires in the general direction of the longitudinal axes of the coils, and concurrently forming a hook at each of the other ends of the bent straight lengths.
Claim 10
Dependent Claim
102 words
The method according to claim 3 in which the straight lengths extend generally tangentially to the coil, and in which the last mentioned step of forming all four of the straight lengths to a connecting configuration includes the steps of concurrently bending the straight length at one end of both wires substantially 90* about a radius and in the region of the tangency to project those wires in the general direction of the longitudinal axes of the coils but inclined toward the longitudinal axes of the coils, and concurrently forming a hook at each of the ends of the bent straight length.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |