US3984513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous injection-blow molding method
Assignee: Individual
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Filing: 1975-02-13
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Granted: 1976-10-05
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Expires: 1995-02-13
Abstract
Abstract The novel method comprises sequential and repetitive steps in which a series of core rods are moved into parison molds, plastic is injected into the molds to form a sheath of plastic about the rods, the plastic-sheathed rods are transferred to blow molds, and pneumatic means close onto the blow molds to cause the parison sheaths to conform to the configuration of the blow molds. Follow this sequence of steps, both the core rod and the blow-formed product are removed from the blow mold; the core rod is re-cycled for a repetition of process, and the product is placed into storage or supply. Too, re-supplies of plastic are timely introduced during the process sequence following the injection use of a last provisioned supply or charge, in order that the cycling might proceed without halt.
Inventors
- 👤 David T. Mulraney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:53
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/28; B29C49/30; B29C49/36; B29C49/02; B29C49/06; B29C49/061; B29C2049/023
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
151 words
A continuous injection-blow molding method, comprising the steps of: moving a plurality of core rods in a closed path; receiving said core rods within parison molds during travel of said rods along a first portion of said path; injecting plastic into said parison molds, and in envelopment of said core rods, while said rods are within said parison molds; transferring said core rods, with the enveloping, injected plastic, to blow molds; blow-forming the injected, enveloping plastic while the latter, rods, and blow molds travel along said second portion of said path; and removing the blow-formed plastic and core rods from the blow molds; wherein said moving step comprises moving said core rods about two rotary axes; and further including moving said parison molds in a first circle about one of said two rotary axes; and moving said blow molds in a second circle about the other of said two rotary axes.
Claim 2
Dependent Claim
151 words
A continuous injection-blow molding method, comprising the steps of: moving a plurality of core rods in a closed path; receiving said core rods within parison molds during travel of said rods along a first portion of said path; injecting plastic into said parison molds, and in envelopment of said core rods, while said rods are within said parison molds; transferring said core rods, with the enveloping, injected plastic, to blow molds; blow-forming the injected, enveloping plastic while the latter, rods, and blow molds travel along said second portion of said path; and removing the blow-formed plastic and core rods from the blow molds; wherein said moving step comprises moving said core rods about two rotary axes; and further including moving said parison molds in a first circle about one of said two rotary axes; and moving said blow molds in a second circle about the other of said two rotary axes.
Claim 3
Dependent Claim
23 words
A continuous injection-blow molding method, according to claim 1, wherein: said injecting step comprises injecting the plastic while said rods are circularly moved.
Claim 4
Dependent Claim
47 words
A continuous injection-blow molding method, according to claim 1, wherein: said injecting step comprises injecting plastic into the parison molds by means of a powered injection cylinder and piston; and further including charging the injection cylinder with plastic, for subsequent injection, intermediate said injecting and transferring steps.
Claim 5
Dependent Claim
25 words
A continuous injection-blow molding method, according to claim 3, wherein: said charging step comprises charging the injection cylinder by means of a pressurized, plastic extruder.
Claim 6
Dependent Claim
36 words
A continuous injection-blow molding method, according to claim 3, wherein: said charging step comprises charging the injection cylinder by means of a pressurized, plastic extruder, and further includes moving the extruder into engagement with the cylinder.
Claim 7
Dependent Claim
69 words
A continuous injection-blow molding method, according to claim 3, wherein: said injecting step comprises injecting each parison mold by means of its own, discrete powered injection cylinder and piston; and further including moving the injection cylinders and pistons about said one rotary axis; and charging each injection cylinder with plastic by means of a pressurized, plastic extruder, while said injection cylinders and pistons move about said one rotary axis.
Claim 8
Dependent Claim
52 words
A continuous injection-blow molding method, according to claim 6, wherein: said charging step comprises charging said cylinders by means of a plurality of plastic extruders; and including moving a first of said extruders into engagement with a given cylinder, and moving a second of said extruders into engagement with a rotationally-following cylinder.
Claim 9
Dependent Claim
40 words
A continuous injection-blow molding method, according to claim 1, further including: moving said parison molds radially of said one axis, as said core rods commence travel along said first portion of said path, thereby to receive said core rods therewithin.
References Cited (Backward Citations)
US3881855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |