US3812666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-twist stranding or cabling machine
Assignee: Pirelli and C SpA
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Filing: 1973-06-15
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Granted: 1974-05-28
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Expires: 1993-06-15
Abstract
Abstract A double-twist stranding or cabling machine in which wires to be twisted pass through a hollow shaft to a pulley on a rotating arm to be twisted, then over a flexible transfer track to a second arm to be returned to a central take-up reel on a rocking cradle while being twisted again. The flexible transfer tracks can be formed by steel ropes which are pulley mounted and spring tensioned to extend from a flat state to a curved state during operation of the machine. This flexibility of the tracks avoids the undesirable bending stresses which affect prior art transfer tracks or arcs, which are relatively rigid and inflexible.
Inventors
- 👤 M Sarracino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:48
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/02; D; D07; D07B; D07B3/00; D07B3/08; D07B3/10; D07B3/103; D07B7/00; D07B7/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
In a wire stranding machine having a twisting unit comprising a pair of twisting means rotatable about a predetermined axis for receiving and twisting a plurality of wires, said twisting means being spaced from each other in the direction of said axis, and means for supplying said wires to and receiving stranded wires from said pair of twisting means, the combination therewith of at least a pair of flexible track means extending between said twisting means, one of said track means being disposed to guide said wires from one of said twisting means to the other thereof and being disposed at one side of and in spaced relation to said axis and the other of said track means being disposed at the opposite side and in spaced relation to said axis, means for securing one end of each of said tracks at one end to one of said twisting means, means for securing the opposite end of each of said tracks to the other of said twisting means for rotation of said tracks around said axis, said tracks being free intermediate their ends to move outwardly with respect to said axis under the centrifugal forces to which they are subjected during said rotation thereof, and elastic means urging said tracks inwardly and toward said axis and limiting the outward movement of said tracks.
Claim 2
Dependent Claim
223 words
In a wire stranding machine having a twisting unit comprising a pair of twisting means rotatable about a predetermined axis for receiving and twisting a plurality of wires, said twisting means being spaced from each other in the direction of said axis, and means for supplying said wires to and receiving stranded wires from said pair of twisting means, the combination therewith of at least a pair of flexible track means extending between said twisting means, one of said track means being disposed to guide said wires from one of said twisting means to the other thereof and being disposed at one side of and in spaced relation to said axis and the other of said track means being disposed at the opposite side and in spaced relation to said axis, means for securing one end of each of said tracks at one end to one of said twisting means, means for securing the opposite end of each of said tracks to the other of said twisting means for rotation of said tracks around said axis, said tracks being free intermediate their ends to move outwardly with respect to said axis under the centrifugal forces to which they are subjected during said rotation thereof, and elastic means urging said tracks inwardly and toward said axis and limiting the outward movement of said tracks.
Claim 3
Dependent Claim
48 words
A wire stranding machine as set forth in claim 1, wherein at least one of said tracks comprises a pair of metal ropes in side-by-side relation and further comprising means for guiding said wires along said ropes and for maintaining said ropes in spaced relation to each other.
Claim 4
Dependent Claim
41 words
A wire stranding machine as set forth in claim 2, wherein said last-mentioned means comprises a plurality of bushes extending around each of said ropes, said bushes being spaced lengthwise of said ropes and having openings therethrough for receiving said wires.
Claim 5
Dependent Claim
91 words
A wire stranding machine as set forth in claim 1, wherein said elastic means comprises at one end of each track means, a tension applying member movably mounted on one of said twisting means and means for securing the track means to said member, an elastic member acting between said tension applying member and said one twisting means to urge said tension applying member in a first direction which tends to elongate the track means and stop means for limiting movement of said tension applying member in a second opposite direction.
Claim 6
Dependent Claim
80 words
A wire stranding machine as set forth in claim 4, wherein said tension applying member comprises a pulley rotatably mounted on the twisting means and having a race receiving the track means, said elastic member is spring means acting between the twisting means and said pulley to urge said pulley to rotate in a direction which tends to elongate the track means and said stop means comprises an abutment on said pulley engageable with a portion of the twisting means.
Claim 7
Dependent Claim
171 words
A wire stranding machine as set forth in claim 1, wherein said twisting means comprises a pair of rotatable shafts mounted with their axes co-axial with said axis and spaced from each other in the direction of said axis, at least one of said shafts having an opening therein at least a portion of which extends axially thereof for feeding said wires therethrough and outwardly thereof, first guide means mounted on said one shaft and spaced outwardly from said axis for receiving said wires from said opening and supplying said wires to one end of one of said track means, said first guide means being rotatable around said axis by said one shaft, second guide means mounted on the other of said shafts and spaced outwardly from said axis for receiving said wires from the other end of said last-mentioned one of said track means, said second guide means being rotable around said axis by said other shaft and further comprising means for receiving said wires from said second guide means.
Claim 8
Dependent Claim
48 words
A wire stranding machine as set forth in claim 6, wherein at least one of said tracks comprises a pair of metal ropes in side-by-side relation and further comprising means for guiding said wires along said ropes and for maintaining said ropes in spaced relation to each other.
Claim 9
Dependent Claim
72 words
A wire stranding machine as set forth in claim 7, wherein said elastic means comprises a tension applying member movably mounted on one of said shafts for rotation therewith, means for securing the ends of said ropes nearer said one shaft to said member, spring means acting on said member in a direction which tends to elongate said ropes and stop means for limiting movement of said member in the opposite direction.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |