US4094688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and molding core for making a flexible hollow molded body which is open on a number of sides
Assignee: Individual
•
Filing: 1976-04-30
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Granted: 1978-06-13
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Expires: 1996-04-30
Abstract
Abstract A method for making a flexible hollow molded body that is open on several sides, such as pipe manifolds, and particularly double-tee headers, T-headers, and Y-headers out of an elastic or a soft thermoplastic material, and a device therefor comprising a brittle one-piece molding core containing at least one predetermined breaking point which is so disposed that after breaking, the molding core may be withdrawn completely from the hollow molded body providing a passage therethrough that is always free and open even when the hollow molded body is bent or comprises geometric shapes that intersect one another. The material of the hollow molded body may be built up around the molded core by various methods, for example by molding or injection in a matrix, by immersion or by centrifugal immersion.
Inventors
- 👤 Franz-Josef Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:36
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/261; B29C45/2614; B29C33/00; B29C33/0033; B29C33/44; B29C33/448; B29C33/76; B29C45/40; B29C45/44; B29C45/4457; B29L; B29L2031/00; B29L2031/24; B29L2031/243; B29L2031/60; B29L2031/601
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
A method for making a flexible pipe manifold having a free passage therethrough comprising: injection molding a plastic material around a brittle one-piece molding core containing at least one predetermined breaking point; after the removal of the manifold from the mold bending the hollow molded body in such a way that the molding core breaks into parts at the predetermined breaking point; and finally withdrawing the parts of the molding core completely from the manifold providing a free passage therethrough.
Claim 2
Independent Claim
80 words
A method for making a flexible pipe manifold having a free passage therethrough comprising: injection molding a plastic material around a brittle one-piece molding core containing at least one predetermined breaking point; after the removal of the manifold from the mold bending the hollow molded body in such a way that the molding core breaks into parts at the predetermined breaking point; and finally withdrawing the parts of the molding core completely from the manifold providing a free passage therethrough.
Claim 3
Dependent Claim
32 words
A method as set forth in claim 1 in which the molding core breaks into parts having legs and the parts are withdrawn completely from the flexible pipe manifold by their legs.
Claim 4
Dependent Claim
25 words
The method as set forth in claim 1 wherein the flexible pipe manifold is made out of one of an elastic and soft thermoplastic material.
Claim 5
Dependent Claim
102 words
A method for making a flexible pipe manifold according to claim 1 wherein the body is built up by injecting material through a number of lateral casting openings which are symmetrically arranged about the predetermined breaking point of the molding core and have a narrow slot-like apertural cross-section disposed at right angles to the principal plane of the molding core and symmetrically thereto, and whose height is at least equal to the diameter of the molding core at this point and is at most equal at this point to the outside diameter of the hollow molded body that is to be made.
Claim 6
Dependent Claim
25 words
The method as set forth in claim 4 wherein the flexible pipe manifold is made out of one of an elastic and soft thermoplastic material.
Claim 7
Dependent Claim
58 words
A molding core for making a flexible pipe manifold characterized by the fact that the molding core is in one piece, comprises a brittle material, and has at least one predetermined breaking point which is so disposed that after breaking, the molding core may be withdrawn completely at this point from the manifold providing a free passage therethrough.
Claim 8
Dependent Claim
58 words
A molding core for making a flexible pipe manifold characterized by the fact that the molding core is in one piece, comprises a brittle material, and has at least one predetermined breaking point which is so disposed that after breaking, the molding core may be withdrawn completely at this point from the manifold providing a free passage therethrough.
Claim 9
Dependent Claim
24 words
A molding core according to claim 6, characterized by the fact that the material consists of one of a thermoplastic and a duroplastic material.
Claim 10
Dependent Claim
36 words
A molding core as set forth in claim 6 having a plurality of predetermined breaking points which are so disposed that after breaking, the molding core may be withdrawn completely at these points from the manifold.
Claim 11
Dependent Claim
34 words
A molding core as set forth in claim 6 wherein, after breaking, the molding core is in parts having legs and the molding core may be withdrawn completely from the manifold by the legs.
Claim 12
Dependent Claim
26 words
The molding core as set forth in claim 6 wherein the flexible pipe manifold is made out of one of an elastic and soft thermoplastic material.
References Cited (Backward Citations)
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Cited
US2217734A
Cited
US2343205A
Cited
US2280074A
Cited
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Cited
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Cited
US3430914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |