US4882101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a reinforced rubber hose by using a plastic mandrel
Assignee: Sumitomo Riko Co Ltd
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Filing: 1988-05-26
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Granted: 1989-11-21
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Expires: 2008-05-26
Abstract
Abstract A method of producing a reinforced rubber hose, including the steps of continuously extruding a long plastic mandrel from a plastic material and feeding the extruded plastic mandrel, extruding an unvulcanized inner rubber tube on the long plastic mandrel, forming a tubular reinforcing layer on the unvulcanized inner rubber tube, extruding an unvulcanized outer rubber tube on the tubular reinforcing layer, vulcanizing the unvulcanized rubber tubes, thereby preparing a long rubber hose formed on the long plastic mandrel, cutting the long rubber hose into short rubber hoses having a predetermined length, while concurrently cutting the long plastic mandrel into short plastic mandrels, removing the short plastic mandrels from the short rubber hoses, and crushing the short plastic mandrels into a starting form of the plastic material, and returning the starting form of the plastic material to an extruder for continuously extruding the long plastic mandrel.
Inventors
- 👤 Katsuhiko Ohkita
- 👤 Kazuhiro Ogata
- 👤 Ken Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:52
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29C; B29C33/00; B29C33/44; B29C33/448; B29C48/00; B29C48/03; B29C48/06; B29C48/15; B29C48/151; B29C48/152; B29C48/153; B29C2793/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/0018; B29C48/002; B29C48/0021; B29C48/0022; B29C48/09; B29C48/13; B29C48/16; B29C48/18; B29C48/21; B29K; B29K2021/00; B29K2105/00; B29K2105/26; B29L; B29L2023/00; B29L2023/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
A method of producing a reinforced rubber hose by using a plastic mandrel, comprising the steps of: continuously extruding a long plastic mandrel from a plastic material and feeding the extruded plastic mandrel; extruding an unvulcanized inner rubber tube on an outer surface of said long plastic mandrel; forming a tubular reinforcing layer on an outer surface of said unvulcanized inner rubber tube; extruding an unvulcanized outer rubber tube on an outer surface of said tubular reinforcing layer; vulcanizing said unvulcanized inner and outer rubber tubes, thereby preparing a long rubber hose formed on said long plastic mandrel; cutting the prepared long rubber hose into short rubber hoses having a predetermined length, and concurrently cutting said log plastic mandrel into short plastic mandrels having said predetermined length; removing said short plastic mandrels from the respective short rubber hoses; and crushing the removed short plastic mandrels into a starting form of said plastic material, and returning said starting form of the plastic material to an extruder for continuously extruding said long plastic mandrel, so that said short plastic mandrels are reclaimed as said plastic material.
Claim 2
Dependent Claim
14 words
A method according to claim 1, wherein said plastic material consists of polymethyl pentene.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein said long plastic mandrel is extruded and fed at a rate of 10-15 m/min.
Claim 4
Dependent Claim
28 words
A method according to claim 1, wherein said starting form of said plastic material consists of a batch of fragments produced by crushing of said short plastic mandrels.
Claim 5
Dependent Claim
28 words
A method according to claim 1, further comprising microwave-heating said unvulcanized inner and outer rubber tubes to soften said rubber tubes, before said unvulcanized rubber tubes ar vulcanized.
Claim 6
Dependent Claim
42 words
A method according to claim 5, further comprising extruding a plastic cover tube of a resin on an outer surface of said unvulcanized outer rubber tube, and cooling said plastic cover tube before said unvulcanized inner and outer rubber tubes are microwave-heated.
Claim 7
Dependent Claim
82 words
A method according to claim 1, further comprising the steps of: winding as a roll a predetermined length of a prepared intermediate product which consists of said long plastic mandrel, said unvulcanized inner and outer tubes and said tubular reinforcing layer; and introducing said roll into a vulcanizing device, to vulcanize said unvulcanized inner and outer rubber tubes of said intermediate product, to thereby prepare said long rubber hose, before the prepared long rubber hose is cut into said short rubber hoses.
Claim 8
Dependent Claim
35 words
A method according to claim 7, further comprising forming a lead covering layer on an outer surface of said unvulcanized outer rubber tube of said intermediate product, before introducing said roll into said vulcanizing device.
Claim 9
Dependent Claim
24 words
A method according to claim 1, wherein said predetermined length of said short rubber hoses falls in a range of 100 to 300 mm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |