US3865531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow molds for making containers having recessed bottoms
Assignee: Deacon Machinery Inc
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Filing: 1973-03-16
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Granted: 1975-02-11
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Expires: 1993-03-16
Abstract
Abstract An apparatus for blow molding containers having a closed recessed end such as a ''''champagne'''' bottle bottom. A parison is first formed in a mold cavity into a blown article of a shape comprising a tubular portion having an outwardly convex closed end. The tubular portion is then cooled while the convex end is heated and then moved into the tubular portion whereupon its curvature is reversed as it becomes a recessed outwardly concave end. The mold may comprise a tubular section, a heated, separately retractable neck section, and an end section which pinches off the parison and is movable into the tubular section after retraction of the neck section for inward movement of the convex end.
Inventors
- 👤 Lawrence A Moore
- 👤 Donald R Welty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/54; B29C49/541; B29C49/02; B29C49/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
A blow molding apparatus for forming a container having an inwardly recessed end, comprising: a blow mold having a cavity tubular in shape with an inwardly concave end, means for expanding a parison within such cavity into said shape thereof having a tubular portion and an outwardly convex end, means for establishing a temperature differential between the convex end and the tubular portion of the blown article to maintain the convex end heated and soft while the tubular portion is maintained sufficiently cooled to have at least some degree of rigidity, and means for moving at least a part of the said inwardly concave end of the blow mold into the tubular portion thereof during the existence of the temperature differential to move the outwardly convex end of the blown article into the tubular portion thereof to reverse the curvature of said end to form an essentially outwardly concave end on the blown article.
Claim 2
Dependent Claim
154 words
A blow molding apparatus for forming a container having an inwardly recessed end, comprising: a blow mold having a cavity tubular in shape with an inwardly concave end, means for expanding a parison within such cavity into said shape thereof having a tubular portion and an outwardly convex end, means for establishing a temperature differential between the convex end and the tubular portion of the blown article to maintain the convex end heated and soft while the tubular portion is maintained sufficiently cooled to have at least some degree of rigidity, and means for moving at least a part of the said inwardly concave end of the blow mold into the tubular portion thereof during the existence of the temperature differential to move the outwardly convex end of the blown article into the tubular portion thereof to reverse the curvature of said end to form an essentially outwardly concave end on the blown article.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1, said mold having an end section which includes means for pinching off the parison at the end of said outwardly convex end.
Claim 4
Dependent Claim
52 words
An apparatus according to claim 1, said mold having a tubular section forming said tubular portion and an end section for supporting the end of the outwardly convex end, said end section being movable into the tubular section for moving the outwardly convex end of the blown article into the tubular portion.
Claim 5
Dependent Claim
47 words
An apparatus according to claim 3, said mold having a neck section between the tubular section and the end section, said neck section being movable out from between the tubular section and the end section thus permitting the movement of the end section into The tubular section.
Claim 6
Dependent Claim
13 words
An apparatus according to claim 4, including means for heating the neck section.
Claim 7
Dependent Claim
23 words
An apparatus according to claim 4, said end section including means for holding the parison at the end of said outwardly convex end.
Claim 8
Dependent Claim
49 words
An apparatus according to claim 6, said end section including a portion forming the end of the mold cavity which is of smaller transverse area than the cross-section of the tubular section, and said neck section being inclined inwardly to smoothly interconnect the tubular section and the end section.
Claim 9
Dependent Claim
105 words
An apparatus according to claim 6, said end section including a recessed end portion for receiving the pinched off bead of the parison and a surrounding exterior surface located outside the mold cavity during formation of the blown article, said exterior surface increasing in transverse cross-section away from the said recessed end portion of the end section up to a maximum transverse cross-section which is smaller than a cross-section of the tubular section, said exterior surface adjoining smoothly with the near end of the tubular section to form the sides of the concave container end when the end section is moved into the tubular section.
Claim 10
Dependent Claim
29 words
An apparatus according to claim 1, said blow mold including means for forming a small outwardly convex portion within the said essentially outward concave end of the blown article.
Claim 11
Dependent Claim
27 words
An apparatus according to claim 9, said blow mold further including means for forming a thick bead at the outer end of said small outwardly convex portion.
Claim 12
Dependent Claim
36 words
An apparatus according to claim 1, said means for establishing a temperature differential including a heating means within the mold, and positioned therein for heating the said originally formed outwardly convex end of the blown article.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |