US3850562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing hollow molded articles
Assignee: Nissei Plastic Industrial Co Ltd
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Filing: 1973-01-24
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Granted: 1974-11-26
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Expires: 1993-01-24
Abstract
Abstract Apparatus for producing hollow molded articles includes means for injecting thermoplastic material into a mold cavity formed by a core, neck mold, and cavity mold to form a parison. The core is then released from the cavity mold and the parison, and the latter, while still attached to the neck mold is released from the cavity mold and moved by a transferring device to an intermittently operated rotatable carrier. This carrier moves the parison and neck mold to a station where a stretching rod is inserted into the parison. The parison is then reheated close to its melting temperature, and thereafter the parison is stretched in one direction and is blown in a blow mold to form a hollow molded article.
Inventors
- 👤 S Takeuchi
- 👤 Y Yuzawa
- 👤 N Ibe
- 👤 F Iriko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:18
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/12; B29C49/02; B29C49/06; B29C49/061; B29C49/062; B29C2049/023; B29C2949/00; B29C2949/07; B29C2949/0715; B29C49/122; B29C49/1224; B29C49/42; B29C49/4205; B29C49/42073; B29C49/42087
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
309 words
An apparatus for producing hollow molded articles by injecting thermoplastic material into an injection mold to form a parison, stretching said parison in one direction and simultaneously or thereafter blowing said stretched parison in a blow mold, which comprises: a base; an intermittently rotatable turntable mounted on the base and having a plurality of positioning portions in positions corresponding to respective operation stages, a first of said stages being provided with a vertically movable stretch-blow device having a blowing block and a vertical stretching rod; horizontally separable neck molds attached on the lower surfaces of mold supporting plates, said mold supporting plates being engaged with said positioning portions of said turntable; a hydraulic mold clamping device provided with an injection mold consisting of a cavity mold attached on a stationary plate, a neck mold fitted on said cavity mold by mold supporting plates, and a core supported by a movable plate to form a mold cavity for a parison, a horizontal injection device to inject thermoplastic material into said mold cavity; a transferring device at an injection or second one of said stages, said transferring device being vertically movable and rotatable to exchange the neck mold on the injection mold and the mold supporting plate attached to the neck mold on the injection mold with a neck mold and its attached mold supporting plate on the turntable; a heating mantle in a heating or third one of said stages, said mantle re-heating the cooled parison from the injection stage; a blow mold provided on the base, said blow mold being separable in the horizontal direction by hydraulic means so as to receive the re-heated parison; and a hydraulic cylinder in a stretch-blow or fourth one of said stages, said cylinder being actuable to stretch said parison to the bottom surface of said mold cavity by depressing said stretching rod.
Claim 2
Independent Claim
309 words
An apparatus for producing hollow molded articles by injecting thermoplastic material into an injection mold to form a parison, stretching said parison in one direction and simultaneously or thereafter blowing said stretched parison in a blow mold, which comprises: a base; an intermittently rotatable turntable mounted on the base and having a plurality of positioning portions in positions corresponding to respective operation stages, a first of said stages being provided with a vertically movable stretch-blow device having a blowing block and a vertical stretching rod; horizontally separable neck molds attached on the lower surfaces of mold supporting plates, said mold supporting plates being engaged with said positioning portions of said turntable; a hydraulic mold clamping device provided with an injection mold consisting of a cavity mold attached on a stationary plate, a neck mold fitted on said cavity mold by mold supporting plates, and a core supported by a movable plate to form a mold cavity for a parison, a horizontal injection device to inject thermoplastic material into said mold cavity; a transferring device at an injection or second one of said stages, said transferring device being vertically movable and rotatable to exchange the neck mold on the injection mold and the mold supporting plate attached to the neck mold on the injection mold with a neck mold and its attached mold supporting plate on the turntable; a heating mantle in a heating or third one of said stages, said mantle re-heating the cooled parison from the injection stage; a blow mold provided on the base, said blow mold being separable in the horizontal direction by hydraulic means so as to receive the re-heated parison; and a hydraulic cylinder in a stretch-blow or fourth one of said stages, said cylinder being actuable to stretch said parison to the bottom surface of said mold cavity by depressing said stretching rod.
Claim 3
Dependent Claim
105 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which said transferring device is interposed between said turntable and said mold clamping device, and comprises: a main portion provided with symmetric pins to hold the mold supporting plate under the seat and a pair of hydraulic cylinders to vertically move piston rods holding the lower supporting plate; a shaft on the upper portion of said main portion to guide movement of the movable plate in the mold clamping device; and a rOtating shaft under said main portion to rotate said main portion for 180* by the engagement with a rotating means.
Claim 4
Dependent Claim
68 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which the inside of said neck mold is supported on the lower surface of the mold supporting plate and separable in the horizontal direction, said inside of said neck mold being shaped so as to form the neck portion of the hollow molded article and to support said parison for producing the hollow molded article.
Claim 5
Dependent Claim
38 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which said mold supporting plate is provided at its center with an aperture to pass means defining a blowing air passage of said fourth stage.
Claim 6
Dependent Claim
95 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which the mold supporting plate supports the neck mold which comprises two mold halves engageable with each other to form a mold cavity surface for the neck portion of the hollow article to be molded, said two mold halves being normally closed by the force of coil springs provided on connecting rods for said mold halves, means defining notches having tapered surfaces on the lower surfaces of said mold halves, members engaged with said notches and operable to open the mold halves.
Claim 7
Dependent Claim
96 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which the turntable is provided with concave portions each of which is provided on its upper portion with a stretch-blow device consisting of a blowing block and a joint member, said blowing block having a vertically movable stretching rod at the center portion thereof, said stretching rod being narrower than said core and the portion around said stretching rod being connected to the air passage of the upper plate, and said joint member being positioned at the top end of said stretching rod.
Claim 8
Dependent Claim
45 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which the upper surface of the horizontall movable blow mold is provided with upward facing projections which operatively engage notches on the lower surface of the neck mold to open the latter.
Claim 9
Dependent Claim
38 words
An apparatus for producing hollow molded articles as claimed in claim 2, in which said mold supporting plate is provided at its center with an aperture to pass means defining a blowing air passage of said fourth stage.
Claim 10
Dependent Claim
95 words
An apparatus for producing hollow molded articles as claimed in claim 3, in which the mold supporting plate supports the neck mold which comprises two mold halves engageable with each other to form a mold cavity surface for the neck portion of the hollow article to be molded, said two mold halves being normally closed by the force of coil springs provided on connecting rods for said mold halves, means defining notches having tapered surfaces on the lower surfaces of said mold halves, members engaged with said notches and operable to open the mold halves.
Claim 11
Dependent Claim
95 words
An apparatus for producing hollow molded articles as claimed in claim 4, in which the mold supporting plate supports the neck mold which comprises two mold halves engageable with each other to form a mold cavity surface for the neck portion of the hollow article to be molded, said two mold halves being normally closed by the force of coil springs provided on connecting rods for said mold halves, means defining notches having tapered surfaces on the lower surfaces of said mold halves, members engaged with said notches and operable to open the mold halves.
Claim 12
Dependent Claim
94 words
An apparatus for producing hollow molded articles as claimed in claim 4, in which each of said concave portions of the turntable is provided on its upper portion with a stretch-blow device consisting of a blowing block and a joint member, said blowing block having a vertically movable stretching rod at the center portion thereof, said stretching rod being narrower than said core and the portion around said stretching rod being connected to the air passage of the upper plate, and said joInt member being positioned at the top end of said stretching rod.
Claim 13
Dependent Claim
45 words
An apparatus for producing hollow molded articles as claimed in claim 3, in which the upper surface of the horizontally movable blow mold is provided with upward facing projections which operatively engage notches on the lower surface of the neck mold to open the latter.
Claim 14
Dependent Claim
45 words
An apparatus for producing hollow molded articles as claimed in claim 5, in which the upper surface of the horizontally movable blow mold is provided with upward facing projections which operatively engage notches on the lower surface of the neck mold to open the latter.
Claim 15
Dependent Claim
30 words
An apparatus for producing hollow molded articles as claimed in claim 1, in which the mantle is mounted for vertical movement and holds the transferred cooled parison therein for reheating.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |