Patent US2359885A successfully refreshed from Google Patents.
US3834852A
Expired / Lapsed
US
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Apparatus for forming blow molded container of oriented thermoplastic polymers
Assignee: Metal Box Enterprises Inc
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Filing: 1973-07-16
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Granted: 1974-09-10
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Expires: 1993-07-16
Abstract
Abstract In a continuously operated blow molding machine utilizing a pair of molding units, each mold unit having two mold halves, said mold units being closed at a backward position and movable to a forward position so as to orient a preformed tube in the forward position, the tube being blown into a container, said mold unit opening and moving to the backward position without any interference with the other mold unit. Each mold half consists of a neck forming and a body forming component slidably connected to each other by a sliding guide means for forcing axially the tube inside of the mold cavity so as to relieve longitudinal orienting stresses and provide fully formed threads in the threaded neck portion of the container.
Inventors
- 👤 J Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/76; B29C49/761
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
221 words
An apparatus for forming blow molded containers from a continuous tube of oriented thermoplastic polymers, comprising: at least two mold units each having two mold halves, each of said halves having first and second forming portions, said portions being slideably connected to each other by a sliding guide means; hydraulic cylinder means directly connecting said two forming portions so as to move said forming portions axially through a limited axial distance with respect to each other for introducing and eliminating a predetermined amount of clearance between opposed end faces on said two forming portions, said first forming portion having a part protuding beyond its end face, and said second forming portion having a complementary end bore slightly larger in diameter than said protruding part, said second forming portion having an internal thread forming bore next to said end bore, whereby the first forming portion can be moved by said hydraulic cylinder means to eliminate said clearance and said protruding part is received in said complementary end bore while a portion of a continuous polymer tube is kept inflated within the mold unit, so that part of tube wall in the thread forming bore is partially relieved of axial stresses to allow internal air pressure within the tube to force the tube into the thread forming bore and form a complete thread.
Claim 2
Independent Claim
221 words
An apparatus for forming blow molded containers from a continuous tube of oriented thermoplastic polymers, comprising: at least two mold units each having two mold halves, each of said halves having first and second forming portions, said portions being slideably connected to each other by a sliding guide means; hydraulic cylinder means directly connecting said two forming portions so as to move said forming portions axially through a limited axial distance with respect to each other for introducing and eliminating a predetermined amount of clearance between opposed end faces on said two forming portions, said first forming portion having a part protuding beyond its end face, and said second forming portion having a complementary end bore slightly larger in diameter than said protruding part, said second forming portion having an internal thread forming bore next to said end bore, whereby the first forming portion can be moved by said hydraulic cylinder means to eliminate said clearance and said protruding part is received in said complementary end bore while a portion of a continuous polymer tube is kept inflated within the mold unit, so that part of tube wall in the thread forming bore is partially relieved of axial stresses to allow internal air pressure within the tube to force the tube into the thread forming bore and form a complete thread.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |