US3740180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core pin for plastic injection blow molding
Assignee: Package Machinery Co
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Filing: 1971-10-19
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Granted: 1973-06-19
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Expires: 1991-10-19
Abstract
Abstract A parison and core pin construction for a plastic injection blow molding machine of the type wherein a rotatable arm supports at least two such pins in diametrically opposed relationship and alternates them between a separable parison mold over the arm and a separable blow mold below the arm. The pins work in unison. That is, when plastic is injected in the parison mold on top of the pin associated with it, that pin thrusts upon and opens the pin opposed to it and in the blow mold to admit air under pressure to the parison in the said blow mold.
Inventors
- 👤 E Sidur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:54
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/72; B29C45/73; B29C45/7312; B29C49/00; B29C49/02; B29C49/06; B29C49/061; B29C49/062; B29C49/063; B29C49/071; B29C49/42; B29C49/58; B29C2049/023; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/072; B29C2949/0725; B29C2949/073; B29C2949/076; B29C2949/0768; B29C2949/0769; B29C2949/077; B29C2949/0772; B29C2949/0776; B29C2949/078; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C45/7337
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
365 words
A parison and core pin for a plastic injection blow molding machine of the type having a pin support arm adapted to carry two such pins on a common axis but projecting in opposite directions so that a parison forming mold can surround one pin while a blow mold surrounds the opposite pin, the said arm having a bore on the said common axis, the two supported pins each including a pin stem projecting outwardly from the bore, and each such pin also including a retainer sleeve secured to the arm on the said axis and receiving the stem for limited axial sliding movement in its bore and in the arm bore, a closed end shell surrounding that portion of the stem projecting outwardly from the retainer sleeve and being movable with the stem in one direction along the common axis to engage the outer end of the retainer sleeve and in the opposite direction to be spaced from the retainer sleeve, the distance separating the inner ends of the shells on the opposed stems being greater than the distance separating the outer ends of the retainer sleeves, and each shell being of such size as to cooperate with the parison mold and with the blow mold, respectively, to define the parison and blow cavities therewithin, the parison mold being adapted when surrounding the shell to provide for injection of a plastic melt against the closed end of the shell and the blow mold being adapted when surrounding the sHell to provide a plate in closely spaced relationship to the closed end of the shell, and each pin being connectible with a source of air under pressure and being adapted to provide such air under pressure in the area of engagement between its shell and sleeve, whereby when one such pin is subjected to the plastic injection pressure in the parison mold its stem is moved axially inwardly in the arm bore to thrust the stem of the opposite pin outwardly in the arm bore and thus to cause its shell to be spaced from its retainer sleeve and to admit air under pressure to blow the parison into final shape in the blow mold.
Claim 2
Dependent Claim
365 words
A parison and core pin for a plastic injection blow molding machine of the type having a pin support arm adapted to carry two such pins on a common axis but projecting in opposite directions so that a parison forming mold can surround one pin while a blow mold surrounds the opposite pin, the said arm having a bore on the said common axis, the two supported pins each including a pin stem projecting outwardly from the bore, and each such pin also including a retainer sleeve secured to the arm on the said axis and receiving the stem for limited axial sliding movement in its bore and in the arm bore, a closed end shell surrounding that portion of the stem projecting outwardly from the retainer sleeve and being movable with the stem in one direction along the common axis to engage the outer end of the retainer sleeve and in the opposite direction to be spaced from the retainer sleeve, the distance separating the inner ends of the shells on the opposed stems being greater than the distance separating the outer ends of the retainer sleeves, and each shell being of such size as to cooperate with the parison mold and with the blow mold, respectively, to define the parison and blow cavities therewithin, the parison mold being adapted when surrounding the shell to provide for injection of a plastic melt against the closed end of the shell and the blow mold being adapted when surrounding the sHell to provide a plate in closely spaced relationship to the closed end of the shell, and each pin being connectible with a source of air under pressure and being adapted to provide such air under pressure in the area of engagement between its shell and sleeve, whereby when one such pin is subjected to the plastic injection pressure in the parison mold its stem is moved axially inwardly in the arm bore to thrust the stem of the opposite pin outwardly in the arm bore and thus to cause its shell to be spaced from its retainer sleeve and to admit air under pressure to blow the parison into final shape in the blow mold.
Claim 3
Dependent Claim
49 words
The pin construction of claim 1 wherein the said arm is rotatable so as to alternate the two such pins in association with the parison and blow molds, and a spacer is slidably disposed in the arm bore in engagement with the inner ends of the two pin stems.
Claim 4
Dependent Claim
43 words
The parison and core pin construction of claim 1 wherein each pin stem is connectible with a pressurized source of a heat exchange fluid and is provided with circulating passages for such fluid to direct it through the cavity of its associated shell.
Claim 5
Dependent Claim
50 words
The pin as defined in claim 2 wherein each pin stem is connectible with a pressurized source of a heat exchange fluid and each stem and the spacer are provided with interconnecting circulating passages for such fluid to direct it through the cavity of the shell associated with each stem.
Claim 6
Dependent Claim
24 words
The pin of claim 4 wherein the said passages in each stem include helical flutes formed externally on the stem within its associated shell.
Claim 7
Dependent Claim
103 words
A parison and core pin construction as defined in claim 1 wherein the said arm is rotatable so as to alternate the two said pins in association with the parison and blow molds, and a separable neck ring is associated with each pin, the parts of each such neck ring being adapted to surround the outer projecting portion of the associated retainer sleeve to define therewith the neck and finish portion of the parison and finally blown plastic article, and the parts of each such neck ring also being adapted to cooperate with the parison and blow molds in defining their respective cavities.
Claim 8
Dependent Claim
67 words
The pin construction of claim 1 wherein the pressurized air is directed to the area of engagement of the shell and sleeve in each pin by providing an annular chamber in the arm adjacent the inner end of each sleeve and connecting it with the source of air, and by providing the wall of the sleeve bore and the inner end of the sleeve with interconnecting channels.
Claim 9
Dependent Claim
34 words
The construction defined in claimed 7 wherein means is provided for venting each said annular chamber after air under pressure has been blown into the parison on its associated pin in the blow mold.
Claim 10
Dependent Claim
66 words
The construction of claim 4 wherein the pressurized air is directed to the area of engagement of the shell and sleeve in each pin by providing an annular chamber in the arm adjacent the inner end of each sleeve and connecting it with the source of air, and by providing the wall of the sleeve bore and the inner end of the sleeve with interconnecting channels.
Claim 11
Dependent Claim
33 words
The combination in claim 9 wherein means is provided for venting each said annular chamber after air under pressure has been blown into the parison on its associated pin in the blow mold.
Claim 12
Dependent Claim
81 words
The parison and core pin construction as defined in claim 10 wherein a separable neck ring is associated with each pin, the parts of each such neck ring being adapted to surround the outer projecting portion of the associated retainer sleeve to define therewith the neck and finish portion of the parison and finally blown plastic article, and the parts of each such neck ring also being adapted to cooperate with the parison and blow molds in defining their respective cavities.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |