Patent US3834257A successfully refreshed from Google Patents.
US3834257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radially expandable and contractible mandrel
Assignee: Uniroyal GmbH
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Filing: 1973-04-12
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Granted: 1974-09-10
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Expires: 1993-04-12
Abstract
Abstract A mandrel or work-piece holder for a tubular blank. The tubular blank may be penetrated by cutting means to provide endless annular elements such as belts for drive or power transmission uses. The mandrel comprises a supporting core having a concentrically arranged radially expandable layer formed by a spirally wound hose. The hose is connected to a source of an inflating medium. Concentric with the hose layer and firmly connected thereto is an intermediate layer of an elastic material. Concentric with the intermediate layer and removable connected thereto is an outer layer of an elastic material. The elasticity of the several layers varies such as to radially decrease.
Inventors
- 👤 W Ganser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:06
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/80; B29C53/82; B29C53/821; B29C53/824; B29C53/56; B29C53/58; B29C53/78; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/24; B65H75/242; B65H75/243; B65H75/2437; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1021; Y10T279/1024; Y10T279/1029; Y10T82/00; Y10T82/26; Y10T82/266; Y10T82/268
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
187 words
A mandrel for supporting a tubuLar blank during penetration by cutting means to form endless annular elements comprising a cylindrical supporting core; a first layer of a radially expandable annular core concentric with and radially outward of the supporting core; a second layer of an elastic material concentric with and radially outward of the first layer, the first layer being firmly connected to the second layer; the second layer being radially expandable by the first layer to form a uniform nonundulating outer surface; and a third layer of an elastic material concentric with and radially outward from the second layer, said third layer having non-undulating inner and outer surface, the third layer inner surface in contact with the second layer outer surface, the third layer outer surface in contact with the tubular blank, the third layer being removably secured throughout its contacting length to the second layer; the elasticity of the second layer being less than that of the first layer, the elasticity of the third layer being less than that of the second layer, the third layer being a wear resistant surface for the cutting means.
Claim 2
Dependent Claim
187 words
A mandrel for supporting a tubuLar blank during penetration by cutting means to form endless annular elements comprising a cylindrical supporting core; a first layer of a radially expandable annular core concentric with and radially outward of the supporting core; a second layer of an elastic material concentric with and radially outward of the first layer, the first layer being firmly connected to the second layer; the second layer being radially expandable by the first layer to form a uniform nonundulating outer surface; and a third layer of an elastic material concentric with and radially outward from the second layer, said third layer having non-undulating inner and outer surface, the third layer inner surface in contact with the second layer outer surface, the third layer outer surface in contact with the tubular blank, the third layer being removably secured throughout its contacting length to the second layer; the elasticity of the second layer being less than that of the first layer, the elasticity of the third layer being less than that of the second layer, the third layer being a wear resistant surface for the cutting means.
Claim 3
Dependent Claim
22 words
A mandrel according to claim 1 wherein the first layer comprises at least one annular chamber extending helically along the supporting core.
Claim 4
Dependent Claim
19 words
A mandrel according to claim 1 wherein the first layer comprises a hose helically wound about the supporting core.
Claim 5
Dependent Claim
15 words
A mandrel according to claim 2 wherein the annular chamber is formed by a hose.
Claim 6
Dependent Claim
24 words
A mandrel according to claim 1 wherein the elasticity of the second layer has a degree of hardness between Shore A20 and Shore A40.
Claim 7
Dependent Claim
23 words
A mandrel according to claim 1 wherein the elasticity of the third layer has a degree of hardness between Shore A45 and A50.
Claim 8
Dependent Claim
36 words
A mandrel according to claim 1 wherein a radially non-expandable insert is located adjacent the respective axial extremities of the mandrel and extends axial inward for a distance less than the axial length of the mandrel.
Claim 9
Dependent Claim
19 words
A mandrel according to claim 7 wherein the radially non-expandable insert is located between the first and third layers.
Claim 10
Dependent Claim
17 words
A mandrel according to claim 7 wherein the radially non-expandable insert is embedded in the second layer.
Claim 11
Dependent Claim
22 words
A mandrel according to claim 7 wherein the radially non-expandable insert comprises a cylindrical layer structure arranged concentrically with the supporting core.
Claim 12
Dependent Claim
19 words
A mandrel according to claim 1 wherein the first layer is connecting to a source of an inflating medium.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |