US5084223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold and method for molding magnetic tape cassette
Assignee: Fujifilm Holdings Corp
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Filing: 1989-03-22
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Granted: 1992-01-28
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Expires: 2009-03-22
Abstract
Abstract A mold for forming a magnetic tape cassette and a method for multi-color molding a magnetic tape cassette or the like. Sprue-runners connected to submarine gates used in making at least portions of the cassette are formed with notches near the submarine gates to reduce the cross-sectional area of the sprue-runners. As result, the sprue-runners can be easily cut off from the body of the cassette by breaking the notched portions.
Inventors
- 👤 Kiyoo Morita
- 👤 Kengo Oishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/2701; B29C45/2708; B29C45/16; B29C45/1635; B29C45/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
In a method of multi-color molding a magnetic tape cassette comprising steps of filling an initially formed opening in a mold with a first molten resin that is to form a body of the cassette, moving a plurality of cores to change the size of said opening so as to define a new opening that communicates with a submarine gate, filling said new opening with a second molten resin different from said first molten resin through said submarine gate so as to mold said cassette body in more than one color and separating said sprue-runner from said mold by pushing said sprue-runner with an ejection pin, the improvement wherein a sprue-runner connected to said submarine gate is formed with a notch near said submarine gate that reduces the cross-sectional areas of said sprue-runner, said notch being located at a position along said sprue-runner such that said sprue-runner can bend uniformly and not rebound and vibrate as said ejection pin separates said sprue-runner from said mold.
Claim 2
Dependent Claim
165 words
In a method of multi-color molding a magnetic tape cassette comprising steps of filling an initially formed opening in a mold with a first molten resin that is to form a body of the cassette, moving a plurality of cores to change the size of said opening so as to define a new opening that communicates with a submarine gate, filling said new opening with a second molten resin different from said first molten resin through said submarine gate so as to mold said cassette body in more than one color and separating said sprue-runner from said mold by pushing said sprue-runner with an ejection pin, the improvement wherein a sprue-runner connected to said submarine gate is formed with a notch near said submarine gate that reduces the cross-sectional areas of said sprue-runner, said notch being located at a position along said sprue-runner such that said sprue-runner can bend uniformly and not rebound and vibrate as said ejection pin separates said sprue-runner from said mold.
Claim 3
Dependent Claim
77 words
The multi-color molding method of claim 1, wherein said first resin is filled in said initially formed opening through a second submarine gate, a second sprue-runner connected to said second submarine gate being formed with a notch near said second submarine gate that reduces the cross-sectional area of said second sprue-runner connected to said second submarine gate, said notch in said second sprue-runner connected to said second submarine gate being larger than said notch in said sprue-runner.
Claim 4
Dependent Claim
15 words
The multi-color molding method of claim 1, wherein said second resin is a transparent resin.
Claim 5
Dependent Claim
20 words
The multi-color molding method of claim 1, wherein said second resin is fed in a lateral direction of said cassette.
Claim 6
Dependent Claim
149 words
In a molding method comprising steps of configuring a mold for providing a first space for molding a first portion of a product to be molded, filling said first space with a first resin injected through a first submarine gate, configuring said mold for providing a second space for molding a second portion of a product to molded, filling said second space with a second resin injected through a second submarine gate, and separating said sprue-runner from said mold by pushing said sprue-runner with an ejection pin, the improvement comprising a step of forming a sprue-runner, connected to at least one of said submarine gates, with a notch near said at least one of said submarine gates, said notch being located at a position along said sprue-runner such that said sprue-runner can bend uniformly and not rebound and vibrate as said ejection pin separates said sprue-runner from said mold.
Claim 7
Dependent Claim
149 words
In a molding method comprising steps of configuring a mold for providing a first space for molding a first portion of a product to be molded, filling said first space with a first resin injected through a first submarine gate, configuring said mold for providing a second space for molding a second portion of a product to molded, filling said second space with a second resin injected through a second submarine gate, and separating said sprue-runner from said mold by pushing said sprue-runner with an ejection pin, the improvement comprising a step of forming a sprue-runner, connected to at least one of said submarine gates, with a notch near said at least one of said submarine gates, said notch being located at a position along said sprue-runner such that said sprue-runner can bend uniformly and not rebound and vibrate as said ejection pin separates said sprue-runner from said mold.
Claim 8
Dependent Claim
62 words
The molding method of claim 5, wherein first and second sprue-runners connected to both said first and second submarine gates, respectively, are formed with notches near the respective ones of said submarine gates, the notch formed in said first sprue-runner connected to said first submarine gate being larger than the notch formed in said second sprue-runner connected to said second submarine gate.
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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) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |