Patent US2761816A successfully refreshed from Google Patents.
US3932104A
Expired / Lapsed
US
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Blow forming apparatus for producing double-walled vessels
Assignee: Individual
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Filing: 1974-04-29
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Granted: 1976-01-13
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Expires: 1994-04-29
Abstract
Abstract Apparatus is disclosed herein for blow forming a double-walled container or body using either injection or extrusion molding techniques. A mold is provided having a movable sleeve which separates and defines a pair of coaxial wall cavities in parallel relation for receiving a parison during injection molding. A mold is further provided for movably positioning its halves about a pair of coaxial cylindrical parisons so as to close the opposite ends of a predetermined length, this latter procedure being an extrusion molding technique.
Inventors
- 👤 Robert F. Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/04; B29C49/04102; B29C49/0031; B29C49/04104; B29C49/06; B29C2049/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
An apparatus for blow forming of hollow bodies so as to produce a double-walled vessel, the combination comprising: a mold including a pair of mated halves having an open cavity defined by the shape of opposing internal wall surfaces; sleeve means disposed over said open cavity for separating supplied parison within said mold cavity into coaxial inner and outer tubes; means forming a portion of said mold at its extreme opposite ends for joining the opposite ends of said coaxial inner and outer tubes to seal said circular space between said inner and outer tubes so as to constitute the double walls of said vessel; an extrusion die for extruding the parison into said cavity; said sleeve comprising a part of said die whereby parison is divided into a pair of downwardly depending coaxial tubes into said mold cavity; said joining means comprises cut-off portions at opposite ends of said mold cavity for severing said parisons and engaging the terminating ends of said tubes together in an integral joint; means for trapping air between the opposing surfaces of said inner and outer tubes comprising; air means for introducing pressurized air into the center of said coaxial tubular parisons urging the parisons into the form of said cavity.
Claim 2
Independent Claim
207 words
An apparatus for blow forming of hollow bodies so as to produce a double-walled vessel, the combination comprising: a mold including a pair of mated halves having an open cavity defined by the shape of opposing internal wall surfaces; sleeve means disposed over said open cavity for separating supplied parison within said mold cavity into coaxial inner and outer tubes; means forming a portion of said mold at its extreme opposite ends for joining the opposite ends of said coaxial inner and outer tubes to seal said circular space between said inner and outer tubes so as to constitute the double walls of said vessel; an extrusion die for extruding the parison into said cavity; said sleeve comprising a part of said die whereby parison is divided into a pair of downwardly depending coaxial tubes into said mold cavity; said joining means comprises cut-off portions at opposite ends of said mold cavity for severing said parisons and engaging the terminating ends of said tubes together in an integral joint; means for trapping air between the opposing surfaces of said inner and outer tubes comprising; air means for introducing pressurized air into the center of said coaxial tubular parisons urging the parisons into the form of said cavity.
References Cited (Backward Citations)
US3023461A
Cited
US3809517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |