US3860683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for blow molding an article having a re-entrant portion
Assignee: Individual
•
Filing: 1973-06-25
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Granted: 1975-01-14
•
Expires: 1993-06-25
Abstract
Abstract A process for blow moulding hollow articles having shapes such as re-entrant portions. During blowing a portion of the mould which is in contact with the moulding material is moved from an open position to a closed position to form the re-entrant portion. Such movable mold portions can be provided at both ends of the mould so as to form plural re-entrant portions.
Inventors
- 👤 Dennis H Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:37
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/54
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A method of making a moulded article by blow moulding a plastics material comprising the steps of extruding plastics material in the form of a tube into a mould having an open portion said open portion being in two separable parts movable between an open position and a plastics material clamping position, closing the ends of said tube including the step of moving together the separable parts of said open portion to clamp closed one end of the tube therebetween, applying gas under pressure to the closed tube, said pressure being applied continuously during the whole of the moulding operation, and during said continued application of said gas pressure closing the open portion of the mould against the expanding plastics material to form a re-entrant portion of an article being moulded.
Claim 2
Independent Claim
131 words
A method of making a moulded article by blow moulding a plastics material comprising the steps of extruding plastics material in the form of a tube into a mould having an open portion said open portion being in two separable parts movable between an open position and a plastics material clamping position, closing the ends of said tube including the step of moving together the separable parts of said open portion to clamp closed one end of the tube therebetween, applying gas under pressure to the closed tube, said pressure being applied continuously during the whole of the moulding operation, and during said continued application of said gas pressure closing the open portion of the mould against the expanding plastics material to form a re-entrant portion of an article being moulded.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 1 in which the mould is of an openable construction, and the open mould portion is withdrawn from the mould after the moulding operation and before the mould is opened to withdraw the moulded article.
Claim 4
Dependent Claim
37 words
A method as claimed in claim 1 in which the mould is also separable into two parts and the two separable parts of both the mould and the open mould portion are separable on the same plane.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 3 in which the separable parts of the mould and the open mould portion moves simultaneously and synchronously to plastics material enclosing positions.
Claim 6
Dependent Claim
35 words
A method as claimed in claim 1 in which one of said open mould portions is provided at each end of the mould to form a re-entrant portion on each end of a moulded product.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5 in which the mould and open mould portions are arranged to form a hollow body having an annular axially directed flange at each end.
Claim 8
Independent Claim
198 words
A method of forming by blow moulding a member including a tubular body and an end wall having a re-entrant portion, said method comprising the steps of providing a mould including a body moulding portion and an end moulding portion of axially split construction with the end moulding portion being movable between an open position spaced axially from the body moulding portion and a closed position cooperatiNg with the body moulding portion, with the end moulding portion in its open and axially split position extruding plastics material in the form of a tube therethrough into the body moulding portion and to a position extending between the body moulding portion and the end moulding portion, clamping the plastics material tube in end sealing relation by the end moulding portion, expanding the plastics material tube by applying gas under pressure thereto, and during the application of gas under pressure moving the end moulding portion axially of the plastics material tube to its closed position and moving that portion of the plastics material tube initially between the body moulding portion and the end moulding portion axially of the plastics material tube into the body moulding portion to form said re-entrant portion.
Claim 9
Independent Claim
198 words
A method of forming by blow moulding a member including a tubular body and an end wall having a re-entrant portion, said method comprising the steps of providing a mould including a body moulding portion and an end moulding portion of axially split construction with the end moulding portion being movable between an open position spaced axially from the body moulding portion and a closed position cooperatiNg with the body moulding portion, with the end moulding portion in its open and axially split position extruding plastics material in the form of a tube therethrough into the body moulding portion and to a position extending between the body moulding portion and the end moulding portion, clamping the plastics material tube in end sealing relation by the end moulding portion, expanding the plastics material tube by applying gas under pressure thereto, and during the application of gas under pressure moving the end moulding portion axially of the plastics material tube to its closed position and moving that portion of the plastics material tube initially between the body moulding portion and the end moulding portion axially of the plastics material tube into the body moulding portion to form said re-entrant portion.
Claim 10
Dependent Claim
28 words
The method of claim 7 wherein the end moulding portion projects into the body moulding portion and forms a re-entrant portion between the article body and end wall.
Claim 11
Dependent Claim
41 words
The method of claim 7 wherein the body moulding portion is also of an axially split construction, and the body moulding portion and the end moulding portion are simultaneously and synchronously closed from split conditions to plastics material tube enclosing positions.
Claim 12
Dependent Claim
43 words
The method of claim 7 wherein that portion of the plastics material tube disposed between the end moulding portion and the body moulding portion is transversely expanded by gaseous pressure therein prior to movement of the end moulding portion to its closed position.
Claim 13
Dependent Claim
28 words
The method of claim 10 wherein the end moulding portion projects into the body moulding portion and forms a re-entrant portion between the article body and end wall.
References Cited (Backward Citations)
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Cited
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |