Patent US3820580A successfully refreshed from Google Patents.
US3820580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siping drum and apparatus for forming siping slashes
Assignee: Bandag Licensing Corp
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Filing: 1972-07-14
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Granted: 1974-06-28
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Expires: 1992-07-14
Abstract
Abstract A drum is provided having at least two helical parallel threads and at least two knives attached thereto having cutting edges extending above the surface. Each knive is located on a different helical thread from the other knive. The drum is used to sipe predetermined lengths of tread stock or a tire.
Inventors
- 👤 F Meserve
- 👤 R Raabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/68; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4821; Y10T83/929; Y10T83/9372; Y10T83/9394
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
An apparatus for siping a continuous web or a tire having a threaded feed drum, means for contacting said web or tire under pressure on the feed drum surface and means for rotating said feed drum to advance said tire or web along the major axis of the feed drum, the improvement wherein the peripheral surface of said drum has at least two parallel helical threads and means for attaching at least two knives to said drum, when more than one knife is attached to said drum each of said knives having a cutting edge extending above said drum peripheral surface and each of said knives being located on a different helical thread from the other knives.
Claim 2
Independent Claim
117 words
An apparatus for siping a continuous web or a tire having a threaded feed drum, means for contacting said web or tire under pressure on the feed drum surface and means for rotating said feed drum to advance said tire or web along the major axis of the feed drum, the improvement wherein the peripheral surface of said drum has at least two parallel helical threads and means for attaching at least two knives to said drum, when more than one knife is attached to said drum each of said knives having a cutting edge extending above said drum peripheral surface and each of said knives being located on a different helical thread from the other knives.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said drum has two helical threads and two knives.
Claim 4
Dependent Claim
81 words
The apparatus of claim 1 wherein said drum is formed by joining two mating drum sections, the peripheral surface of each section having at least two parallel helical threads, said sections having a radial surface with exposed butt ends of each helix, said butt ends being spaced apart a peripheral distance to permit attaching a plurality of knives to the radial surface of a helix and to permit only one knife to be attached to the radial surface of each helix.
Claim 5
Dependent Claim
14 words
The apparatus of claim 3 wherein said drum sections have two parallel helical threads.
Claim 6
Dependent Claim
124 words
The apparatus of claim 1 wherein said drum is formed by joining two drum sections with a spacer thread therebetween, the surface of each section having two parallel threads, said sections having a radial surface with exposed butt ends of each helix, said butt ends being spaced apart a peripheral distance less than which permits attaching two knives between said butt ends, said spacer thread having the same circumference as said drum sections, the same thickness as one of said threads, and adapted to be attached to a butt end on each section so that when the spacer and two sections are joined, two continuous helical threads are formed and means for attaching one knife each to one radial surface of said spacer thread.
Claim 7
Dependent Claim
70 words
A feed drum for siping a continuous web or a tire having the peripheral surface with at least two parallel helical threads and means for attaching at least two knives to said drum, when more than one knife is attached to said drum, said knives having a cutting edge extending above said drum surface and each of said knives being located on a different helical thread from the other knives.
Claim 8
Dependent Claim
70 words
A feed drum for siping a continuous web or a tire having the peripheral surface with at least two parallel helical threads and means for attaching at least two knives to said drum, when more than one knife is attached to said drum, said knives having a cutting edge extending above said drum surface and each of said knives being located on a different helical thread from the other knives.
Claim 9
Dependent Claim
15 words
The apparatus of claim 6 wherein said drum has two helical threads and two knives.
Claim 10
Dependent Claim
79 words
The drum of claim 6 which is formed by joining two mating drum sections, the peripheral surface of each section having at least two parallel helical threads, said sections having a radial surface with exposed butt ends of each helix, said butt ends being spaced apart a peripheral distance to permit attaching a plurality of knives to the radial surface of a helix and to permit only one knife to be attached to the radial surface oF each helix.
Claim 11
Dependent Claim
14 words
The drum of claim 8 wherein said drum sections have two parallel helical threads.
Claim 12
Dependent Claim
127 words
The drum of claim 6 wherein said drum is formed by joining two drum sections with a spacer thread therebetween, the surface of each section having two parallel threads, said sections having a radial surface with exposed butt ends of each helix, said butt ends being spaced apart a peripheral distance so that only one knife is attached to the radial surface of each helix, said spacer thread having the same circumference as said drum sections, the same thickness as one of said threads, and adapted to be attached to a butt end on each section so that when the spacer and two sections are joined, two continuous helical threads are formed and means for attaching one knife each to one radial surface of said spacer thread.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |