EP0086253A1
Expired / Lapsed
EP
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Method of manufacturing contact rubber structure
Assignee: Polymatech Co Ltd
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Filing: 1982-10-01
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Granted: —
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Expires: 2002-10-01
Abstract
Abstract In a method of manufacturing a contact rubber structure, colored, hard, non-vulcanized rubber materials (11) are injected into cavities (15) of a mold (14) for molding key top portions (6); a mold (16, 18) for molding key sheet portions (7) is placed over the key top portions (6) formed by the foregoing molding step; and a non-vulcanized rubber material (17) softer than the material of each key top portion (6) is charged, compressed and heated, so that the key sheet portions (7) are made to be integral with the key top portions (6).
Inventors
- 👤 Nishihira Toshihiro
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:43
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H01H13/705; B; B29; B29C; B29C45/00; B29C45/02; B29L; B29L2031/00; B29L2031/46; B29L2031/466; H01H2221/00; H01H2221/002; H01H2229/00; H01H2229/044; H01H2229/046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A method of manufacturing a contact rubber .structure, comprising the steps of: injecting colored, hard, non-vulcanized rubber materials into cavities of a mold for molding key top portions; placing over said key top portions a mold for molding key sheet portions; and charging, compressing and heating a non-vulcanized rubber material having a lower hardness than that of the material of each said key top portion, thereby making the key sheet portions integral with said key top portions.
Claim 2
Independent Claim
77 words
A method of manufacturing a contact rubber .structure, comprising the steps of: injecting colored, hard, non-vulcanized rubber materials into cavities of a mold for molding key top portions; placing over said key top portions a mold for molding key sheet portions; and charging, compressing and heating a non-vulcanized rubber material having a lower hardness than that of the material of each said key top portion, thereby making the key sheet portions integral with said key top portions.
Claim 3
Dependent Claim
28 words
A method as set forth in claim 1, wherein said injecting step is carried out by using an injection apparatus including a predetermined number of rubber reservoir portions.
Claim 4
Independent Claim
165 words
A method of manufacturing a contact rubber structure comprising key top portions and key sheet portions which are integral with each other, wherein suitably colored, hard, non-vulcanized rubber materials are contained in an injection apparatus provided with a multiplicity of rubber reservoir portions each having a gate provided at the bottom thereof; subsequently, a ram provided with convex portions is downwardly moved . so that the convex portions thereof are loaded into the reservoir portions of said injection apparatus, whereby the rubber materials contained in the reservoir portions are injected, through said gates, into cavitied defined in a lower mold, so that a multiplicity of colored key top portions are molded; thereafter, said injection apparatus is replaced with a lower female mold adapted - for molding said key sheet portions, and the lower female mold is placed on said lower mold; and a soft sheet rubber material is placed on said lower female mold, compressed from above by means of a male mold and heated.
Claim 5
Independent Claim
165 words
A method of manufacturing a contact rubber structure comprising key top portions and key sheet portions which are integral with each other, wherein suitably colored, hard, non-vulcanized rubber materials are contained in an injection apparatus provided with a multiplicity of rubber reservoir portions each having a gate provided at the bottom thereof; subsequently, a ram provided with convex portions is downwardly moved . so that the convex portions thereof are loaded into the reservoir portions of said injection apparatus, whereby the rubber materials contained in the reservoir portions are injected, through said gates, into cavitied defined in a lower mold, so that a multiplicity of colored key top portions are molded; thereafter, said injection apparatus is replaced with a lower female mold adapted - for molding said key sheet portions, and the lower female mold is placed on said lower mold; and a soft sheet rubber material is placed on said lower female mold, compressed from above by means of a male mold and heated.
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