US3778211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic injection mold apparatus
Assignee: REDMER PLASTICS Inc
•
Filing: 1971-12-27
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Granted: 1973-12-11
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Expires: 1991-12-27
Abstract
Abstract Apparatus for injection molding of hollow plastic articles having substantially uniform wall thickness throughout. Plastic is injected into a mold cavity around an article-defining core member. Associated with the core member is a movable sleeve member which controls the disposition of the plastic material around the core and retains the core centrally located within the cavity.
Inventors
- 👤 R Moen
- 👤 E Sanelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:10
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/36; B29C45/46; B29C45/56; B29C2045/363; B29C2045/5695
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
255 words
Injection molding apparatus for molding formed plastic articles, said molding apparatus including a mold, said mold having a cylindrical cavity, a removable core member adapted for insertion into said cavity, core support means affixed to one end of said core member, said core support means having an inserted position and a retracted position whereby when said core support means is in said inserted position said core member is inserted into said cavity and when said core support means is in said retracted position said core member is retracted from said cavity, means for introducing plastic material under pressure into said cavity, a sleeve member contiguously surrounding said core member and rotatably movable relative thereto, ejector plate means affixed to one end of said sleeve member, said ejector plate means associated with said core support means so that when said core support means moves between the inserted position and the retracted position said ejector plate means also moves, said ejector plate means being movable relative to said core support means between a sleeve inserted position and a sleeve retracted position whereby when said ejector plate means is in said sleeve inserted position, said sleeve extends beyond said core support means and is inserted into said cavity, knock out pin means for placing said ejector plate means into said sleeve inserted position prior to introduction of the plastic material into said cavity for enabling the movement of said ejector plate means to the retracted position responsive to the force of the plastic material on the sleeve member.
Claim 2
Dependent Claim
255 words
Injection molding apparatus for molding formed plastic articles, said molding apparatus including a mold, said mold having a cylindrical cavity, a removable core member adapted for insertion into said cavity, core support means affixed to one end of said core member, said core support means having an inserted position and a retracted position whereby when said core support means is in said inserted position said core member is inserted into said cavity and when said core support means is in said retracted position said core member is retracted from said cavity, means for introducing plastic material under pressure into said cavity, a sleeve member contiguously surrounding said core member and rotatably movable relative thereto, ejector plate means affixed to one end of said sleeve member, said ejector plate means associated with said core support means so that when said core support means moves between the inserted position and the retracted position said ejector plate means also moves, said ejector plate means being movable relative to said core support means between a sleeve inserted position and a sleeve retracted position whereby when said ejector plate means is in said sleeve inserted position, said sleeve extends beyond said core support means and is inserted into said cavity, knock out pin means for placing said ejector plate means into said sleeve inserted position prior to introduction of the plastic material into said cavity for enabling the movement of said ejector plate means to the retracted position responsive to the force of the plastic material on the sleeve member.
Claim 3
Dependent Claim
56 words
The molding apparatus of claim 1 wherein means are provided for moving said core support means away from said mold, and means for forcing said ejector plate to the inserted position with said core support means removed from said mold to thereby cause said sleeve member to remove the formed plastic article from said core member.
Claim 4
Dependent Claim
113 words
A mold for plastic injection molding comprising a mold cavity; a core member for insertion into said cavity; means for inserting and retracting said core member; means for introducing plastic material to be molded into said cavity; and a sleeve member surrounding said core member and movable relative thereto, said sleeve member being adapted for insertion into said mold cavity prior to introduction of the plastic material when it is introduced into the mold cavity; a clamp plate, said core being permanently mounted on said clamp plate; and an ejector plate provided for movement with respect to said clamp plate and core, said sleeve member being movable with respect to said ejector plate.
Claim 5
Dependent Claim
113 words
A mold for plastic injection molding comprising a mold cavity; a core member for insertion into said cavity; means for inserting and retracting said core member; means for introducing plastic material to be molded into said cavity; and a sleeve member surrounding said core member and movable relative thereto, said sleeve member being adapted for insertion into said mold cavity prior to introduction of the plastic material when it is introduced into the mold cavity; a clamp plate, said core being permanently mounted on said clamp plate; and an ejector plate provided for movement with respect to said clamp plate and core, said sleeve member being movable with respect to said ejector plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |