US3692453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade and anvil pinch-off with compression sealing means
Assignee: Phillips Petroleum Co
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Filing: 1971-01-04
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Granted: 1972-09-19
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Expires: 1991-01-04
Abstract
Abstract A mold half in a blow molding apparatus has a projecting blade offset from a bottom wall forming surface thereof. This blade cooperates with a recessed area on a second mold half in a relationship similar to that of a halved or lap-spliced joint, to sever a parison and form a compression seal adjacent the severed end. In this way, a seal can be obtained on a parison which is at a temperature below that at which it is generally regarded as sealable.
Inventors
- 👤 Donald J Quigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:21
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/4802; B29C49/4817; B29C49/50; Y; Y10; Y10S; Y10S83/00; Y10S83/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
A blow molding apparatus including a mold comprising in combination: a first mold half having a wall forming surface and a blade having a pointed leading edge projecting toward a center line of said mold, said blade having a flat surface offset from said wall forming surface; a second mold half having a tendon projection disposed toward said center line, one surface of said tendon projection being a wall forming surface which cooperates with said wall forming surface of said first half, said second half further having a recessed area into which said blade fits on closing said mold halves, said pointed leading edge of said blade being coincident with said flat surface of said blade and disposed so as to slide adjacent a surface of said tendon projection within said recess which surface within said recess is opposite said wall forming surface of said tendon projection, said first and second mold halves being so contoured that in fully closed position a narrow gap exists between a leading end of said tendon projection and an end of said first half between said wall forming surface of said first half and said flat surface of said blade; means to grasp a first end of a parison preform; means to grasp a second end of said parison preform; and means to effect relative movement of said means to grasp said first and second ends.
Claim 2
Dependent Claim
232 words
A blow molding apparatus including a mold comprising in combination: a first mold half having a wall forming surface and a blade having a pointed leading edge projecting toward a center line of said mold, said blade having a flat surface offset from said wall forming surface; a second mold half having a tendon projection disposed toward said center line, one surface of said tendon projection being a wall forming surface which cooperates with said wall forming surface of said first half, said second half further having a recessed area into which said blade fits on closing said mold halves, said pointed leading edge of said blade being coincident with said flat surface of said blade and disposed so as to slide adjacent a surface of said tendon projection within said recess which surface within said recess is opposite said wall forming surface of said tendon projection, said first and second mold halves being so contoured that in fully closed position a narrow gap exists between a leading end of said tendon projection and an end of said first half between said wall forming surface of said first half and said flat surface of said blade; means to grasp a first end of a parison preform; means to grasp a second end of said parison preform; and means to effect relative movement of said means to grasp said first and second ends.
Claim 3
Dependent Claim
69 words
Apparatus according to claim 1 wherein said gap has a lateral dimension of 10 to 100 mils and said leading end of said tendon projection and said end of said first mold half have a height of 20 to 140 mils said end of said first half being a flat wall extending directly between said wall forming surface of said first half and said flat surface of said blade.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 1 wherein at least the sealing and severing portions of said mold halves are of metal hardened to a 59 to 61 Rockwell C hardness.
Claim 5
Dependent Claim
12 words
Apparatus according to claim 1 wherein said mold is a bottle mold.
Claim 6
Dependent Claim
30 words
Apparatus according to claim 1 wherein said leading end of said tendon projection and said end of said first half are so contoured as to define a shaped tab mold.
Claim 7
Dependent Claim
215 words
A blow molding apparatus including a mold comprising in combination: a first mold half having a wall forming surface and a blade having a pointed leading edge projecting toward a center line of said mold, said blade having a flat surface offset from said wall forming surface; a second mold half having a tendon projection disposed toward said center line, one sUrface of said tendon projection being a wall forming surface which cooperates with said wall forming surface of said first half, said second half further having a recessed area into which said blade fits on closing said mold halves, said pointed leading edge of said blade being coincident with said flat surface of said blade and disposed so as to slide adjacent a surface of said tendon projection within said recess which surface within said recess is opposite said wall forming surface of said tendon projection and which surface slopes toward said wall forming surface in a direction toward a leading end of said tendon projection, said first and second mold halves being so contoured that in fully closed position a narrow gap exists between said leading end of said tendon projection and an end of said half between said wall forming surface of said first half and said flat surface of said blade.
Claim 8
Dependent Claim
215 words
A blow molding apparatus including a mold comprising in combination: a first mold half having a wall forming surface and a blade having a pointed leading edge projecting toward a center line of said mold, said blade having a flat surface offset from said wall forming surface; a second mold half having a tendon projection disposed toward said center line, one sUrface of said tendon projection being a wall forming surface which cooperates with said wall forming surface of said first half, said second half further having a recessed area into which said blade fits on closing said mold halves, said pointed leading edge of said blade being coincident with said flat surface of said blade and disposed so as to slide adjacent a surface of said tendon projection within said recess which surface within said recess is opposite said wall forming surface of said tendon projection and which surface slopes toward said wall forming surface in a direction toward a leading end of said tendon projection, said first and second mold halves being so contoured that in fully closed position a narrow gap exists between said leading end of said tendon projection and an end of said half between said wall forming surface of said first half and said flat surface of said blade.
Claim 9
Dependent Claim
29 words
An apparatus according to claim 6 wherein said surface of said tendon projection opposite said wall forming surface and said flat surface of said blade having a complimentary slope.
Claim 10
Dependent Claim
39 words
An apparatus according to claim 6 wherein said flat surface of said blade has a ledge of height equal to the amount of said slope, said ledge cooperating with an edge of said leading end of said tendon projection.
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |