US3872893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-reinforced plastic hose and method for molding same
Assignee: Fred T Roberts and Co
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Filing: 1974-02-07
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Granted: 1975-03-25
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Expires: 1994-02-07
Abstract
Abstract The hose of the present invention comprises an all plastic multilayer hose having a reinforcement therein which is of a material which is flexible and stiff under normal working conditions and which has a flow temperature less than the flow temperature of the cover and liner layers and which forms spaced reinforcing elements incident to the manufacture of the hose. The present invention contemplates use of an apparatus and simplified method which permits the reinforced hose to be readily manufactured in predetermined lengths or continuously so as to provide a hose of indefinite lengths.
Inventors
- 👤 Robert E Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:54
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/13; B29C48/16; B29C48/18; B29C48/21; B29C48/0017; B29K; B29K2021/00; B29K2023/00; B29K2023/18; B29K2023/22; B29K2027/00; B29K2027/06; B29L; B29L2023/00; B29L2023/18; B29L2031/00; B29L2031/772; B29L2031/7732; Y; Y10; Y10S; Y10S264/00; Y10S264/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
256 words
The method of making a self-reinforced corrugated hose of thermoformable elastomeric material without the necessity of incorporating non-elastomeric reinforcement materials comprising the steps of forming a tubular member by extruding an inner tubular layer consisting essentially of elastomeric material, extruding a tubular reinforcing layer consisting essentially of elastomeric material over said inner layer, and extruding a tubular cover layer consisting essentially of elastomeric material over said reinforcing layer, the material of the reinforcing layer having a flow temperature lower than the material of the inner layer and the cover layer, inserting said tubular member into a mold having a cavity provided with a corrugated wall, heating said tubular member to a molding temperature above the flow temperature of the reinforcing layer and lower than the flowtemperature of the inner layer and the cover layer, applying internal pressure to the tubular member to force the cover layer of the tubular member into conforming engagement with the corrugated mold wall to mold the exterior of the hose, said pressure being sufficient to cause portions of the flowable reinforcing layer to be displaced into the troughs in the cover layer produced by the corrugations of the mold, and to cause the cover layer and inner layer to engage and adhere together over the crests of the corrugations of the mold, and setting the hose as molded in a single mold operation, said reinforcing layer forming accurately and uniformly spaced resilient reinforcing portions conforming to the corrugations of the mold and disposed between said inner layer and said cover layer.
Claim 2
Independent Claim
256 words
The method of making a self-reinforced corrugated hose of thermoformable elastomeric material without the necessity of incorporating non-elastomeric reinforcement materials comprising the steps of forming a tubular member by extruding an inner tubular layer consisting essentially of elastomeric material, extruding a tubular reinforcing layer consisting essentially of elastomeric material over said inner layer, and extruding a tubular cover layer consisting essentially of elastomeric material over said reinforcing layer, the material of the reinforcing layer having a flow temperature lower than the material of the inner layer and the cover layer, inserting said tubular member into a mold having a cavity provided with a corrugated wall, heating said tubular member to a molding temperature above the flow temperature of the reinforcing layer and lower than the flowtemperature of the inner layer and the cover layer, applying internal pressure to the tubular member to force the cover layer of the tubular member into conforming engagement with the corrugated mold wall to mold the exterior of the hose, said pressure being sufficient to cause portions of the flowable reinforcing layer to be displaced into the troughs in the cover layer produced by the corrugations of the mold, and to cause the cover layer and inner layer to engage and adhere together over the crests of the corrugations of the mold, and setting the hose as molded in a single mold operation, said reinforcing layer forming accurately and uniformly spaced resilient reinforcing portions conforming to the corrugations of the mold and disposed between said inner layer and said cover layer.
Claim 3
Dependent Claim
32 words
The method according to claim 1 in which said tubular member is formed by extruding said inner tubular layer, said tubular reinforcing layer and said tubular cover layer in a triple extruder.
Claim 4
Dependent Claim
19 words
The method according to claim 1 in which each of said layers consists essentially of a polyvinyl chloride elastomer.
Claim 5
Dependent Claim
15 words
The method according to claim 3 in which said molding temperature is about 370* F.
Claim 6
Dependent Claim
27 words
A continuous molding method according to claim 1 in which reinforced corrugated hose of continuous length is molded and subsequently cut into hoses having the desired lengths.
Claim 7
Dependent Claim
13 words
A self-reinforced, extruded, corrugated hose produced according to the method of claim 1.
Claim 8
Dependent Claim
13 words
A self-reinforced, extruded, corrugated hose produced according to the method of claim 2.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |