US3571848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High exhaust needle
Assignee: Continental Can Co Inc
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Filing: 1969-01-14
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Granted: 1971-03-23
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Expires: 1989-01-14
Abstract
Abstract A blow mold is provided with a needle actuable to puncture a parison captured in the mold and to admit air into the parison for blowing a hollow article having the configuration of the mold. The needle is positioned to puncture the parison in a waste portion thereof. The barrel of the needle is substantially larger than the tip, beginning a short distance back of the point, the tip being sized to form a small initial puncture opening in the parison. The needle slides in a bore closely fitting the barrel. When the parison is blown, that portion surrounding the tip of the needle expands along the barrel, enlarging the puncture opening. After the parison is blown and the needle retracted, the air rapidly exhausts from the parison through the enlarged puncture opening, which communicates with atmosphere through a passage intersecting the needle bore.
Inventors
- 👤 John L Szajna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:56
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/02; B29C49/04; B29C49/58; B29C49/60; B29C2049/6054
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
178 words
In blow molding apparatus of the type having a mold with a cavity for housing a tubular, plastic parison; a bore in said mold communicating with said cavity; a blow needle reciprocable in said bore between a retracted position and a blow position, for piercing said parison and forming therein a puncture opening of predetermined initial size and for insertion into said parison, upon movement of said needle toward said blow position, for blowing said parison with pressure fluid to expand said parison to fill said cavity, for registering said opening with said bore, and for blocking said opening, with said needle in said blow position, and for unblocking said opening, upon movement of said needle from said blow position toward said retracted position; and a passage so disposed relative to said bore as to establish communication between said opening and atmosphere, for exhaust of said pressure fluid from said parison, upon said unblocking; the improvement comprising means for enlarging said opening to a size greater than said initial size, upon said blowing, whereby to facilitate said exhaust.
Claim 2
Dependent Claim
178 words
In blow molding apparatus of the type having a mold with a cavity for housing a tubular, plastic parison; a bore in said mold communicating with said cavity; a blow needle reciprocable in said bore between a retracted position and a blow position, for piercing said parison and forming therein a puncture opening of predetermined initial size and for insertion into said parison, upon movement of said needle toward said blow position, for blowing said parison with pressure fluid to expand said parison to fill said cavity, for registering said opening with said bore, and for blocking said opening, with said needle in said blow position, and for unblocking said opening, upon movement of said needle from said blow position toward said retracted position; and a passage so disposed relative to said bore as to establish communication between said opening and atmosphere, for exhaust of said pressure fluid from said parison, upon said unblocking; the improvement comprising means for enlarging said opening to a size greater than said initial size, upon said blowing, whereby to facilitate said exhaust.
Claim 3
Dependent Claim
141 words
In blow molding apparatus, the improvement according to claim 1, characterized by said needle having a tip for forming said puncture opening of said initial size corresponding to the cross section size of said tip, upon said insertion, said means being a needle barrel of larger cross section than said tip, said barrel being concentric with said bore and joined to said tip at a setback distance such as for a portion of said barrel to be extended into said cavity upon said insertion, and for telescoping of said barrel in said opening to enlarge said opening to the cross section size of said barrel, to register said opening with said bore, and to block said opening, upon said blowing, said distance also being such as for said barrel to unblock said opening, upon said needle movement toward said retracted position.
Claim 4
Dependent Claim
65 words
In blow molding apparatus, the improvement according to claim 2, further characterized in that said bore communicates with a pocket in a wall of said cavity, said barrel portion extending into said pocket, upon said insertion, said pocket being disposed and sized for formation of a boss on said parison, with said enlarged puncture opening in said boss, outwardly of said wall, upon said blowing.
Claim 5
Dependent Claim
74 words
In blow molding apparatus, the improvement according to claim 3, further characteriZed in that said passage intersects said bore near said pocket, said pocket being so disposed as to form said boss with a chamber in said parison defined by said boss at said opening, and with said chamber and said opening generally opposite to said passage, whereby to mitigate friction loss in fluid flow from said parison to said passage, upon said exhaust.
Claim 6
Dependent Claim
57 words
In blow molding apparatus, the improvement according to claim 3, further characterized in that said cavity wall is curved, said pocket having a planar wall outward of said curved wall and transverse to said barrel, for formation of said boss with a planar wall having said puncture opening through said boss wall, clear of said curved wall.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |