US4056596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous method for making hose with destruction of mandrel
Assignee: Pahlsche Gummi-und Asbest-Gesellschaft (Paguag)
•
Filing: 1976-05-07
•
Granted: 1977-11-01
•
Expires: 1996-05-07
Abstract
Abstract A process for the continuous production of a hose formed and vulcanized on a mandrel, comprising continuously forming and advancing a hollow mandrel, continuously forming said hose about said mandrel and continuously vulcanizing said hose while advancing said hose in axial direction with said mandrel, after said mandrel arrives at a predetermined location continuously destroying said mandrel within said hose, and removing the remnants of said mandrel from said hose. The mandrel may be formed of a brittle material such as sintered metal or of a relatively low melting material and its destruction can be effected by longitudinal severance into strips and/or melting by induced current and/or fragmentation by ultrasound. Alternatively the mandrel may be made of soluble material and subsequently dissolved away. Endless reinforcements may also be circulated and the mandrel formed so as to partially embed said reinforcements. Corresponding apparatus is provided.
Inventors
- 👤 Karl-Heinz Pahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:42
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29C; B29C33/00; B29C33/44; B29C33/448; B29C33/52; B29C33/34; B29C33/36; B29C33/76; B29C48/00; B29C48/001; B29C48/0011; B29C48/0018; B29C48/0022; B29C48/03; B29C48/09; B29C48/15; B29C48/151; B29C48/16; B29C48/18; B29C48/21; B29K; B29K2021/00; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
In a method in which a hose of vulcanizable material is continuously formed on a hollow, destructible mandrel, the improvement comprising: continuously forming and advancing said mandrel and continuously vulcanizing said hose while advancing said hose in an axial direction with said mandrel; after a portion of said hose has been vulcanized on a portion of said mandrel, continuously destroying said portion of said mandrel within said hose and removing remnants of said mandrel from said hose, the destroying and removing steps including longitudinally severing said mandrel into a plurality of strips, flexing said strips and carrying said strips back within the hollow mandrel, breaking down said strips into their components and recycling the components of the mandrel strips to the mandrel forming stage.
Claim 2
Dependent Claim
124 words
In a method in which a hose of vulcanizable material is continuously formed on a hollow, destructible mandrel, the improvement comprising: continuously forming and advancing said mandrel and continuously vulcanizing said hose while advancing said hose in an axial direction with said mandrel; after a portion of said hose has been vulcanized on a portion of said mandrel, continuously destroying said portion of said mandrel within said hose and removing remnants of said mandrel from said hose, the destroying and removing steps including longitudinally severing said mandrel into a plurality of strips, flexing said strips and carrying said strips back within the hollow mandrel, breaking down said strips into their components and recycling the components of the mandrel strips to the mandrel forming stage.
Claim 3
Dependent Claim
15 words
The process according to claim 1, wherein said mandrel comprises a material which is brittle.
Claim 4
Dependent Claim
12 words
The process according to claim 1, wherein said material is sintered metal.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein said breaking down is accomplished by induction heating and the components of the mandrel strips so produced are carried away by means of a fluid.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein said breaking down is accomplished by ultrasonic means and the components of the mandrel strips so produced are carried away by means of a fluid.
Claim 7
Dependent Claim
40 words
The process according to claim 1, including the additional steps of continuously applying a heat-resistant overcoating to the outer surface of the hose prior to vulcanization, and shrinking said overcoating, whereby pressure is produced on the hose to facilitate vulcanization.
Claim 8
Dependent Claim
43 words
The process according to claim 6, wherein the application of the overcoating to the hose prior to the vulcanization is effected with the aid of a continuously operating seal against the high internal pressure in an autoclave in which vulcanization is subsequently effected.
Claim 9
Dependent Claim
30 words
The process according to claim 6, including the further steps of continuously removing the overcoating after vulcanization and continuously returning the components of the overcoating to the coating application stage.
Claim 10
Dependent Claim
49 words
The process according to claim 8, including the further step of continuously advancing and returning a plurality of deformable endless tension reinforcements, the mandrel being formed about said reinforcements which become embedded therein, at the destruction stage said reinforcements being separated and returned within the hollow mandrel for re-use.
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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |