Dry-type rubber pressing apparatus
Patent 4934919 Issued on June 19, 1990. Estimated Expiration Date: 
December 21, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 21, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2838796 Method to attach the center electrode into a ceramic insulator body of spark plugs Press for pressing potlike articles from ceramic powder Apparatus for manufacturing articles by pressing and sintering Method of manufacturing dry-pressed molded articles Apparatus for compensating axial strain in an isostatic press Patent #: 4564352 InventorsAssigneeApplicationNo. 135303 filed on 12/21/1987US Classes:425/405.2, Isostatic type264/313, Utilizing a flexible, deformable, or destructable molding surface or material425/420Including provision to remove entrained gasExaminersPrimary: Woo, Jay H.Assistant: Bushey, C. Scott Attorney, Agent or FirmInternational ClassB29C 043/10Foreign Application Priority Data1987-04-27 JPAbstractPowder is filled in an axially elongate powder filling space defiined in a flexible pressure tube, and the pressure-bearing surface of the flexible pressure tube is pressurized with a pressurizing fluid, from a wall portion of the pressure tube which corresponds to a localized region of the powder filling space progressively toward another wall portion of the pressure tube which corresponds to an end of the powder filling space, until the pressure-bearing surface of the pressure tube is pressurized in its entirety, thereby compacting the powder in the powder filling space. Therefore, air in the powder is progressively squeezed toward the end of the powder filling space where the air can be discharged. Thus, no air remains trapped in the powder, and a formed product is prevented from being damaged, which enables elongate products to be produced.Field of SearchFORMING ARTICLES BY UNITING RANDOMLY ASSOCIATED PARTICLESUtilizing a flexible, deformable, or destructable molding surface or material Utilizing fluid-expansible mold Including hydrostatic or liquid pressure MEANS TO CREATE A VACUUM OR APPLY FLUID PRESSURE WITHIN A PRESS FORMING MOLD Isostatic type Male shaping member and female mold Including means to insert or remove core Including provision to remove entrained gas By means flexing or deforming the mold | |
