US3681486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of bottles or the like by blow molding
Assignee: Conduco AG
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Filing: 1969-08-04
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Granted: 1972-08-01
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Expires: 1989-08-04
Abstract
Abstract The sections of an open-and-shut mold in a blow molding apparatus carry clamping elements which engage the parison during closing of the mold to form in the parison a constriction and to support the blank which is obtained on severing of the parison. The blowing mandrel thereupon expands the blank directly below the constriction so that the blank engages the jaws at the upper end of the mold before the blank is fully expanded in response to admission of gas through the mandrel. The mandrel can pivot the clamping elements away from engagement with the blank or the apparatus comprises separate motors which move the clamping elements in synchronism with movements of the mold sections. The clamping elements can move the blank away from the die of the extruder prior to or during closing of the mold.
Inventors
- 👤 Gottfried Mehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:57
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/4205; B29C49/42073; B29C49/02; B29C49/04; B29C49/04102; B29C49/0411; B29C49/04112
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
256 words
A method of blow molding bottles or similar hollow articles of the type having an open-ended part of predetermined internal and external dimensions, comprising the steps of extruding through an extruder thermoplastic material in the form of a hollow parison having an end into the space between the sections of an open mold spaced from the extruder; closing the mold to clamp the end of the parison between the mold sections and clamping the parison at a point between the extruder and the mold to form in The parison a constriction external of the mold; severing the parison at a point between the constriction and the extruder to separate from the parison a hollow blank with a hollow end portion located at one side of said constriction; moving the extruder and the closed mold with the blank relative to each other to move the mold with the blank out of the path of thermoplastic material extruded by the extruder; radially expanding the blank against the closed mold to form in a portion of the blank between the constriction and that portion of the mold which accommodates the open end of the finished article a bulbous enlargement and to expand an intermediate portion of said blank in said portion of the mold into engagement with said mold portion; mechanically calibrating said intermediate portion of said blank; and converting the blank into an article by blowing a gas through said hollow end portion and said constriction so that the remainder of the blank expands in the closed mold.
Claim 2
Independent Claim
256 words
A method of blow molding bottles or similar hollow articles of the type having an open-ended part of predetermined internal and external dimensions, comprising the steps of extruding through an extruder thermoplastic material in the form of a hollow parison having an end into the space between the sections of an open mold spaced from the extruder; closing the mold to clamp the end of the parison between the mold sections and clamping the parison at a point between the extruder and the mold to form in The parison a constriction external of the mold; severing the parison at a point between the constriction and the extruder to separate from the parison a hollow blank with a hollow end portion located at one side of said constriction; moving the extruder and the closed mold with the blank relative to each other to move the mold with the blank out of the path of thermoplastic material extruded by the extruder; radially expanding the blank against the closed mold to form in a portion of the blank between the constriction and that portion of the mold which accommodates the open end of the finished article a bulbous enlargement and to expand an intermediate portion of said blank in said portion of the mold into engagement with said mold portion; mechanically calibrating said intermediate portion of said blank; and converting the blank into an article by blowing a gas through said hollow end portion and said constriction so that the remainder of the blank expands in the closed mold.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1, further comprising the step of terminating the clamping action prior to said converting step.
Claim 4
Dependent Claim
18 words
A method as defined in claim 1, wherein said expanding step includes blowing a gas into the blank.
Claim 5
Dependent Claim
73 words
A method as defined in claim 1, wherein the thermoplastic material is extruded downwardly so that said end is the lower end of the parison and wherein said clamping step comprises deforming the parison radially inwardly to provide said constriction with a narrow passage at a level above the mold, said severing step comprising imparting to said hollow end portion the shape of a funnel which diverges upwardly and away from said constriction.
Claim 6
Dependent Claim
30 words
A method as defined in claim 1, wherein said converting step comprises severing said hollow end portion and part of said expanded intermediate portion from the remainder of the blank.
Claim 7
Dependent Claim
61 words
A method as defined in claim 1, wherein said expanding step comprises admitting into the blank a gas by way of said hollow end portion and said constriction whereby the thus admitted gas effects radial expansion of the blank against that portion of the mold which accommodates the open-ended part of the finished article and limited radial expansion of said constriction.
Claim 8
Dependent Claim
35 words
A method as defined in claim 1, wherein said calibrating step comprises inserting a calibrated blow mandrel into the free end of said blank and moving said blow mandrel into said portion of the mold.
Claim 9
Dependent Claim
30 words
A method as defined in claim 1, wherein said expanding step comprises moving the constriction toward said portion of the mold which accommodates the open-ended part of the finished article.
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |