Flexible Fluid Pressure Patents (Class 425/DIG19)
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Patent number: 5798070Abstract: A molding machine comprises a mold composed of lower and upper mold sections. A recess is defined in the lower mold section to receive a lead frame or other objects. The lead frame is sandwiched between the upper and lower mold sections. A mold cavity is defined in the lower mold section below the recess so as to receive a thermosetting resin or encapsulant. A gasket groove is defined adjacent to the mold cavity to receive a gasket. The gasket is subject to plastic deformation upon application of force. An oil chamber is communicated with the gasket groove and contains hydraulic oil. The hydraulic oil is pressurized to urge the gasket against the lead frame. As a result, the gasket is so deformed as to closely contact the surface of the lead frame and seal the mold cavity. The hydraulic oil is preferably mixed with thermoplastic resin in powder form.Type: GrantFiled: March 4, 1996Date of Patent: August 25, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kunito Sakai, Kazuharu Oshio, Hirozoh Kanegae
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Patent number: 5693277Abstract: A novelty candle having flat sides incorporating a plurality of defined shapes located at the outer surface of the flat sides of the candle and a method of making same are provided. The method has the steps of: forming a sheet of wax to a desired thickness; heating the sheet of wax to below the melting temperature of the wax; cutting a plurality of shapes from the heated sheet of wax; arranging the plurality of shapes in a mold having an interior defined by flat sidewalls flush against the flat sidewalls and filling the interior of the mold with wax. In another embodiment, a novelty candle having a tree-like wax ornamentation on the surface thereof and a method of making same are also provided.Type: GrantFiled: June 21, 1995Date of Patent: December 2, 1997Inventor: Michael R. Widmer
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Patent number: 5656051Abstract: The invention relates to a cooling method and a mold arrangement for the manufacture of glass articles or similar materials. The mold arrangement of this type includes a plurality of cooling passageways distributed independently and longitudinally around of the periphery of said mold, for the flow of a cooling fluid. A fluid distribution chamber coupled in coincidence with the cooling passageways, for the flow of the cooling flow, independently for each one of said passageway of the mold. A fluid regulating plate is coupled with the fluid distribution means, to regulate independently the flow of cooling in each one of the passageways of the mold, to regulate and control the cooling curve of said mold.Type: GrantFiled: September 5, 1996Date of Patent: August 12, 1997Assignee: Vidriera Monterrey, S.A.Inventor: Rafael Mares-Benavides
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Patent number: 5545026Abstract: A platen for applying pressure during hydroforming of polycarbonate and similar sheet material includes a flexible diaphragm for applying pressure in response to hydraulic fluid under pressure within a platen cavity and a diaphragm circumscribing sealing member for inhibiting seepage of hydraulic fluid and for preventing outward migration of the material of the diaphragm during a hydroforming operation. The junction between the sealing member and the diaphragm is conforming and void free to prevent hydraulic fluid flow therebetween. To help contain the hydraulic fluid within the platen cavity, a circumscribing inwardly extending foot of the diaphragm provides a mechanical and dynamic seal against an adjacent surface of the platen cavity.Type: GrantFiled: May 26, 1995Date of Patent: August 13, 1996Inventors: Michael L. Fritz, Alton L. Fritz
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Patent number: 5492664Abstract: A primary outer shell includes, in its most preferred embodiment, a base and a wall which includes at least one embedded foreign object and defines openings into an inner cavity containing a burnable candle member which causes the outer shell to glow and cast shadows without melting. The outer shell is constructed according to a unique molding method which includes at least partially immersing a swollen distensible mold, such as a water-filled balloon, into a reservoir of molding material, such as wax, to allow the molding material to form a molded shell around the distensible mold. After the distensible mold with the attached molded shell is removed from the reservoir of molding material, it is placed upon a flat surface to form a flat bottom into the molded shell.Type: GrantFiled: January 14, 1994Date of Patent: February 20, 1996Inventor: Creighton Cutts
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Patent number: 5466146Abstract: A platen for applying pressure during hydroforming of polycarbonate and similar sheet material includes a flexible diaphragm for applying pressure in response to hydraulic fluid under pressure within a platen cavity and a diaphragm circumscribing sealing member for inhibiting seepage of hydraulic fluid and for preventing outward migration of the material of the diaphragm during a hydroforming operation. The junction between the sealing member and the diaphragm is conforming and void free to prevent hydraulic fluid flow therebetween. To help contain the hydraulic fluid within the platen cavity, a circumscribing inwardly extending foot of the diaphragm provides a mechanical and dynamic seal against an adjacent surface of the platen cavity.Type: GrantFiled: May 6, 1994Date of Patent: November 14, 1995Inventors: Michael L. Fritz, Alton L. Fritz
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Patent number: 5427518Abstract: In order to produce multilayer structures of composite materials by draping recut elementary layers on a shaping mold, an installation is proposed which comprises, apart from the mold, a gripping tool which can e.g. be fitted on the articulated arm of a robot. The shaping mold comprises a flexible membrane equipped with suction cups ensuring the gripping of the elementary precut layers. A vacuum circuit makes it possible to engage the membrane on a countermold placed behind the latter in order to shape the grasped elementary layer. When the tool is brought onto the mold, a pressure source acts on the membrane in order to compact the elementary later on the mold. A suction system keeps the layer on the mold following the release of the suction by the cups.Type: GrantFiled: June 23, 1993Date of Patent: June 27, 1995Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation SNECMAInventors: Richard A. P. Morizot, Jean-Yves M. Nioche
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Patent number: 5299926Abstract: A novel spinning apparatus is provided with a tubular coagulating liquid flow control valve body made of an elastomeric material and whose inner diameter is changeable according to external pressure. The valve body has a simple structure and is easy to retrofit to a conventional spinning apparatus. When dope is extruded, a mass of dope with gelled skin can pass easily and quickly through the opened valve body so that the spinning workability at the start of spinning is high. Further, since the coagulating liquid flows smoothly, the spinning speed can be increased without damaging the filaments.Type: GrantFiled: October 23, 1992Date of Patent: April 5, 1994Assignee: Sumika-Hercules Co., Ltd.Inventors: Shigeru Nakajima, Tadao Marui
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Patent number: 5023042Abstract: Sailboards having a tucked rail are made from a flexible, resilient mold so that the seam of the board is along its bottom edge instead of at its point of greatest breadth. A flexible mold part having the contour of the sailboard to be produced has an opening smaller than the greatest breadth of the board. The mold is first flexed so that its opening is sufficiently wide to receive the blank that forms the body of the sailboard. Secondly, the blank is inserted into the flexed mold, and thirdly, the mold is released and its resiliency returns it to its original shape. A conventional rigid mold part closes the open end, and a vacuum is applied to form the final product. The flexible mold part is flexed a second time to remove the product.Type: GrantFiled: June 29, 1989Date of Patent: June 11, 1991Inventor: Gary Efferding
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Patent number: 4946640Abstract: A method for the shaping of a sheet of preform material. A flat planar (heated) sheet of preform material is held tightly between two elastomeric sheets, the sheets and preform material forming a laminate assembly. The laminate assembly is then formed about a mold having the desired contours. The elastomeric sheets maintain the preform material parallel to the surface contours of the mold as the molding process proceeds. A fluid such as air is flowed between the mold surface and the laminate assembly during the forming process to prevent the elastomeric sheets from binding on the mold surface. Wrinkles are eliminated in the final shape of the preform material, and fiber distortion of tears or rips in the material are minimized due to the fluid lubrication between the mold surface and the laminate assembly.Type: GrantFiled: April 17, 1989Date of Patent: August 7, 1990Assignee: Shell Oil CompanyInventor: Nazim S. Nathoo
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Patent number: 4943222Abstract: An apparatus is disclosed for the shaping of a sheet of preform material. A flat planar (heated) sheet of preform material is held tightly between two elastomeric sheets of the apparatus, the sheets and preform material forming a laminate assembly. The laminate assembly is then formed about a mold having the desired contours. The elastomeric sheets maintain the preform material parallel to the surface contours of the mold as the molding process proceeds. A fluid such as air is flowed between the mold surface and the laminate assembly during the forming process to prevent the elastomeric sheets from binding on the mold surface. Wrinkles are eliminated in the final shape of the preform material, and fiber distortion or tears or rips in the material are minimized due to the fluid lubrication between the mold surface and the laminate assembly.Type: GrantFiled: April 17, 1989Date of Patent: July 24, 1990Assignee: Shell Oil CompanyInventor: Nazim S. Nathoo
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Patent number: 4898705Abstract: A method for producing a synthetic resin union joint, the method including the steps of forming a union nut having a screw portion and a union sleeve of an elastically softenable material, the union sleeve having a union swivel end and a connecting end, heating a length of the union nut at least equal to a thickness dimension of the flange part but not extending to the screw portion so as to elastically soften the length of the union nut, abutting one end of a truncated cone-shaped expansion guide with an end face of the union swivel end, shifting and enlarging the length of the union nut along the expansion guide so as to pass over the union swivel end and so that the union nut passes over the guide, and returning the length of the union nut to its original configuration due to a restoring force of the elastically softenable material so as to be positioned within the union swivel end and the connecting end.Type: GrantFiled: May 16, 1988Date of Patent: February 6, 1990Assignee: Kubotatekko Kabushiki KaishaInventors: Junsuke Kyomen, Masayuki Sakaguchi, Hiroto Fujii
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Patent number: 4891179Abstract: A method of consolidating a tubular composite article of polymeric matrix material and fibrous reinforcing material, comprising enclosing a length of the tubular composite article in a tubular protective member and advancing the protective member to carry the length of the article thus enclosed through a consolidation zone wherein the article is progressively subjected to consolidating temperature and pressure. The method enables the composite to be pulled through the consolidation zone without the distortion which tends to occur in standard "pultrusion" methods owing to surface friction and longitudinal tension on the composite.Type: GrantFiled: November 6, 1987Date of Patent: January 2, 1990Assignee: Textilver S.A.Inventors: Donald G. Peacock, Stanley W. Kirkham
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Patent number: 4886442Abstract: An apparatus for forming composite members has a frame assembly which is lowered onto a table. A sheet of vacuum bagging material, supported by the frame, covers a tooling surface on the table. Attached to the sheet is a downwardly depending seal which continuously extends around the sheet's periphery. This seal inserts into an upwardly opening channel that surrounds the perimeter of the table's tooling surface as the frame is lowered. The seal is inflated while in the channel and this provides in airtight seal between the sheet and tooling surface.Type: GrantFiled: May 26, 1988Date of Patent: December 12, 1989Assignee: The Boeing CompanyInventors: Peter D. McCowin, Paul E. Nelson
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Patent number: 4879073Abstract: A method of molding a polymeric containing article by exposing the article to ultraviolet radiation and a substantially uniform pressure. The method includes placing the precursor article within a pressure vessel and substantially filling the vessel with a solid, flowable, polymer medium that is substantially ultraviolet transparent under pressure. The polymer medium is pressurized so as to produce a substantially, uniform predetermined pressure on the surface of the article and the article is exposed to ultraviolet radiation that passes through the polymer medium to cure the article. Alternatively, the polymeric article may be passed through the medium containing vessel during exposure to ultraviolet radiation and a substantially uniform pressure.Type: GrantFiled: April 22, 1988Date of Patent: November 7, 1989Assignee: United Technologies CorporationInventor: Robert V. Kromrey
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Patent number: 4765166Abstract: A press for shaping a sheet metal blank in a cavity with a forming tool which determines the shape of the finished product. The sheet is pressed against the tool by a diaphragm which is influenced by a pressure medium on the side facing away from the cavity. The forming tool consists of an inexpensive casting material supported in a cup-shaped container. The space between the bottom and sides of the container and the bottom and sides of the cavity is filled with an elastic material.Type: GrantFiled: June 15, 1987Date of Patent: August 23, 1988Assignee: ASEA AktiebolagInventors: Carl Bergman, Lennart Svensson
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Patent number: 4755341Abstract: A method particularly adapted for making a complex shaped composite component that has reduced bridging defects. The method comprises disposing a composite prepreg on to a substantially flat tool. The composite prepreg has a substantially flat section and at least one prepreg member extending from and substantially perpendicular to said flat section. A layer, at least about 125% of said composite prepreg height, of a said flowable particulate silicone rubber is disposed in substantially complete contact with the composite prepreg surface. The particulate silicone rubber has a flow rate of at least 0.6 gram/second through a 1.1 cm diameter pipe 7.6 cm long under applied pressure of 10.34 MPa at room temperature. The layer of solid flowable rubber is covered with a bag to effect a gas tight seal. The bag is exposed to pressures which are transferred to said prepreg by said solid flowable polymer. The composite prepreg is exposed to temperatures to form a composite component.Type: GrantFiled: September 10, 1986Date of Patent: July 5, 1988Assignee: United Technologies CorporationInventors: Richard T. Reavely, Peter C. Ogle, Robert V. Kromrey
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Patent number: 4748837Abstract: A process for manufacturing a spherical shell from a blank utilizing dies, comprising the steps of forming and clamping a flange portion of the blank by pressing with the dies and applying fluid pressure to an elastic diaphragm or flat metal sheet to cause the diaphragm or sheet to bulge the blank so as to form a curved shell surface.Type: GrantFiled: December 10, 1986Date of Patent: June 7, 1988Assignee: Hitachi, Ltd.Inventors: Hiroshi Kurosawa, Izumi Ochiai, Yoshio Asahino
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Patent number: 4732639Abstract: A bonding apparatus for vacuum bagging is disclosed comprising a base having a top surface provided with an outer peripheral vacuum manifold, a diaphragm having a top member and side walls adapted for placement on the base and in conjunction therewith defining a chamber encompassing a work piece; one or more evacuation ports formed in the base or the diaphragm adapted for connection to a vacuum source whereby the chamber may be evacuated of ambient atmosphere to form a vacuum therein; and an edge member associated with the side walls, including a solid, conformable seal adapted to seal the vacuum manifold and to provide at least a primary seal thereagainst. In one embodiment, intended for autoclaving applications, a seal providing both primary and secondary sealing is disclosed. The diaphragm, edge member and seal preferably comprise an elastomeric material.Type: GrantFiled: August 25, 1986Date of Patent: March 22, 1988Inventor: Cosby M. Newsom
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Patent number: 4715805Abstract: A laminate consisting of a number of air-permeable sheets of a material is placed on the supporting surface of a table, and a major portion of the periphery of the laminate, inclusive of a lower surface thereof, is covered with a sheet impermeable to air. A suction pipe is arranged on the supporting surface along at least one side surface of the laminate and has a suction port faced toward the one side surface. A periheral portion of the suction port is covered with the air-impermeable sheet, and the laminate is compressed in the direction of its thickness by evacuating air from within a space defined by the air-impermeable sheet by vacuum producing means connected to the suction pipe. The air-impermeable sheet and laminate can be moved together with the suction pipe in parallel relation to the supporting surface, and they can be stopped at a desired position, during the evacuation process.Type: GrantFiled: March 23, 1987Date of Patent: December 29, 1987Assignee: Kabushiki Kaisha Kawakami SeisakushoInventor: Nobuo Nasu
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Patent number: 4715923Abstract: Fiber-reinforced resin deposits or other materials are consolidated in a noncontact-frictionless manner through the use of a pressurized plenum chamber (20) of a fluid bearing (10). The fluid bearing (10) is flexible and floats relative to the material (16) to be consolidated so that ply drop-offs and other variations in the thickness or surface contour of the material are easily accommodated. While within the plenum chamber, the material is locally heated by radiant energy from a source (30) positioned within the chamber. This localized heating enables the material to solidify in cooler zones of the plenum chamber under a uniform pressure.Type: GrantFiled: December 26, 1985Date of Patent: December 29, 1987Assignee: The Boeing CompanyInventor: Frederick L. Knoll
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Patent number: 4704082Abstract: The invention concerns an isostatic press mold for producing moldings from powdery ceramic material. The mold comprises two mold parts which are movable relative to one another between a mold-closed position and a mold-open position and which, in the mold-closed position, define between them a mold cavity. On at least one of the mold parts, there is a press diaphragm which on one side defines part of the limiting surface of the mold cavity and on the other side is subjected to a pressure fluid. On its said other side, that is to say on its side facing away from the mold cavity, the press diaphragm is designed with a plurality of recess spaces so that the press mold can be deformed, while at the same time reducing the internal stresses occurring in it.Type: GrantFiled: April 30, 1986Date of Patent: November 3, 1987Assignees: Hutschenreuther AG, Eugen BuhlerInventors: Eugen Buhler, Klaus Strobel, Karl Schwarzmeier
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Patent number: 4704240Abstract: A method of fabricating a fiber reinforced resin composite article having tubular structures that has improved density and fewer voids. The method comprises laying up a prepreg that has at least two tubular structures and disposing a thermally conductive metallic support structure within and in contact with the tubular structures. The prepreg is disposed within and in substantially complete contact with a tool which has at least one hole. An expandable bag having at least one opening in communication with a tube is inserted within each tubular structure thereby forming a void space between the bag and the tubular structure. The void space is substantially filled with a solid flowable particulate silicone rubber that contacts the prepreg and the tube is sealed to edge of hole in the tool. The solid flowable rubber is caused to transfer a substantially uniform predetermined pressure to the surface of the prepreg by pressurizing the expandable bag.Type: GrantFiled: September 10, 1986Date of Patent: November 3, 1987Assignee: United Technologies CorporationInventors: Richard T. Reavely, Peter C. Ogle, Robert V. Kromrey
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Patent number: 4702870Abstract: Methods and apparatus for producing three-dimensional structural members having one flat side from wood fibers utilizing flow deposition of the fibers onto a support. The support includes resilient deformable mold inserts. The mold inserts are formed of silicone rubber and may be blocks of the material, or may be a membrane which can be inflated to form the mold inserts. Pressing is done with a force normal to the support, and the mold inserts create response forces at varying directions to thus shape and hold the three-dimensional finished part. Heat drying also may be used.Type: GrantFiled: May 20, 1986Date of Patent: October 27, 1987Assignee: The United States of America as represented by the Secretary of AgricultureInventors: Vance C. Setterholm, John F. Hunt
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Patent number: 4676086Abstract: A press of pressure cell type comprises a press stand with two opposing force-absorbing elements between which a space is formed. In this space there is located a plate with a recess in which an elastic diaphragm is arranged. The diaphragm forms, together with the plate, a pressure cell. Elongated side supports for the diaphragm are provided at the sides of the said space. A tray insertable into the space forms, together with the plate and the diaphragm, a closed press space. The pressure cell is connected to a pressure medium source. Each side support is formed with an elongated recess, in which there is arranged an expansible membr of elastic material. Each expansible member forms a side support for a press tool located in the tray.Type: GrantFiled: April 16, 1986Date of Patent: June 30, 1987Assignee: ASEA AktiebolagInventor: Keijo Hellgren
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Patent number: 4632027Abstract: An apparatus and method are disclosed for a continuous compressing operation involving receiving pliable articles, compressing them along a single axis, and releasing them once compresssed. The apparatus and method each involve the use of a pair of disks arranged in a V-shaped configuration, with their opposing surfaces contoured to form opposing recesses which, together with a flexible barrier spanning the space between the disks, define a pocket opening toward the rims of the disks for receiving the article and retaining it during compression. The disks are rotated while maintaining the V shape, thereby causing the pocket and hence the retained article to become compressed. Once the narrowest point of the V is passed, the compressed article is released by gravitational force.Type: GrantFiled: March 18, 1985Date of Patent: December 30, 1986Assignee: Sunsweet Growers, Inc.Inventor: Robert E. Gunnerson
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Patent number: 4626183Abstract: Apparatus including an extruder, a die member and a vacuum device connected in series. The vacuum device includes a chamber and a device at at least the outlet thereof to air-tightly seal the chamber around the extruded mass of foamed thermoplastic resin. The air-shielding or sealing device is an annular tube which is inflatable radially inwardly having a flexible inner face which seals around the extruded mass. A durable, abrasion-resistant, flexible protective sheet can be interposed between the mass and the tube.Type: GrantFiled: February 28, 1984Date of Patent: December 2, 1986Assignee: Sekisui Kaseihin Kogyo Kabushiki KaishaInventors: Hideharu Shirai, Yoshifumi Nakahara
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Patent number: 4616987Abstract: A tool (10) for taking an impression of an area of the internal bore of a tubular member (16) or a joint between two such members comprising means for directing a casting compound between two flexible membranes (20, 22) which are then forced outwardly so that the outer membrane (22) engages the area to be inspected within a bore where the compound forms a resilient mold (cast). When the force against the membranes and mold is removed, the membranes and mold collapse allowing the mold and tool (10) to be retrieved out the bore.The tool (10) carries casting compound in two parts unmixed to the area to be inspected where a selected amount of working fluid (60) under preselected pressure from a fluid source (18) of a selected volume will open a valve (42) then force the two parts to be mixed and directed between two flexible membranes (20, 22).Type: GrantFiled: June 17, 1985Date of Patent: October 14, 1986Assignee: Vetco Offshore Industries, Inc.Inventors: Charles L. Boyers, John W. Finlayson
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Patent number: 4588368Abstract: In an apparatus for producing molded articles from a pourable compound, such as an oxide-ceramic compound, for example a porcelain compound, an injection chamber is formed between an isostatic compression molding tool and an injection chamber. A suction opening is connected to the injection chamber. The pourable compound is supplied through an inlet opening. A fluidizing air inlet line is positioned in the compound inlet opening and it is movable relative to the inlet opening so that it can be placed in an open or closed position for admitting or blocking flow of the compound into the injection chamber.Type: GrantFiled: May 9, 1984Date of Patent: May 13, 1986Assignees: Eugen Buhler, Hutschenreuther AGInventors: Eugen Buhler, Klaus Strobel, Karl Schwarzmeier
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Patent number: 4496299Abstract: A moulding tool unit for semi-isostatic compaction of a powder has a mould cavity (14) defined by an elastomeric jacket (121). The jacket (121) is surrounded with clearance by an elastomeric sleeve (122) which is sealingly joined to the jacket (121). The space (123) between the sleeve (122) and jacket (121 ) is filled with an isostatic pressure translating medium such as a hydraulic liquid (127). The jacket (121) may be supported in a direction towards the sleeve (122) by a stiff jacket (125) having perforations (126) through which the hydraulic liquid (127) can flow. The unit is adapted such that for a pressing operation it can be inserted with a small clearance and pressurized in the dry pressing chamber of a hydraulic press.Type: GrantFiled: November 2, 1983Date of Patent: January 29, 1985Assignee: KB Cold Isostatic Press Systems CIPSInventor: Ola Pettersson
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Patent number: 4477399Abstract: A method for insulating a water heater with foamed insulation comprises inflating a tube in the cavity between the shell and the tank to define a boundary for the cavity into which the insulating material is injected. The device is deflated after the foamed insulation has set in the cavity. Apparatus for carrying out such method is provided.Type: GrantFiled: June 16, 1982Date of Patent: October 16, 1984Assignee: GSW Inc.Inventor: Robert W. Tilton
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Patent number: 4352647Abstract: A tire press bag well is insulated with at least one envelope. The envelope extends substantially around the bag well within the bag well housing and can be inflated. The envelope, in addition to its insulating properties, can have insulation thereon and the ends of the envelope can be fastened to itself. The configuration of the envelope, once installed, desirably conforms to the shape of the bag well housing. Since heat is applied to a tire press via the bag well, insulation thereof considerably reduces heat loss as well as reduces cure time.Type: GrantFiled: December 19, 1980Date of Patent: October 5, 1982Inventor: Harold S. Rocco
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Patent number: 4330247Abstract: The invention provides an apparatus for forming moulded articles such as removable insoles for shoes. A blank is placed between a rigid plate corresponding to the peripheral base contour of the finished article on one side thereof and a mould bed corresponding to the shape of the article on the other side thereof. Peripheral areas of the blank are exposed by the plate and a flexible diaphragm is applied over the plate under pressure or with the aid of a vacuum after heating the blank to the softening point, to define said peripheral base contour, and to conform the other side and the exposed areas of the blank to the shape of the mould bed. In the case of shoe insoles, a range of sizes can be made with the same mould bed, using only different sizes of plate.Type: GrantFiled: June 9, 1980Date of Patent: May 18, 1982Inventor: Serge L. Folschweiler
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Patent number: 4330250Abstract: A press diaphragm for pressing china plates etc. has an edge part designed to be forced inwards on pressing and then to be moved back outwards on letting off the pressure clear of the plate edge. To this end the diaphragm has an edge part, acted upon by a downwardly moving keeper, and has a groove in its upper face. Under the groove the diaphragm is acted upon by hydraulic pressure more than at other positions.Type: GrantFiled: August 4, 1980Date of Patent: May 18, 1982Assignee: Dorst-Keramikmaschinen-BauInventor: Peter Pinkas
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Patent number: 4280804Abstract: A vacuum tool for a vacuum bagging curing operation comprising a base on which is placed a one piece vacuum bag comprising a top sheet with a peripheral sealing means attached thereto which cooperate to seal the bag in a zipper-like fashion, thus enclosing workpiece therein for the vacuum curing operation. A vacuum manifold is attached to the base to connect the tool to a vacuum pump to create a vacuum between the base and bag.Type: GrantFiled: October 1, 1979Date of Patent: July 28, 1981Assignee: General DynamicsInventor: Charles L. Holland
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Patent number: 4227673Abstract: A gasket for a lens casting cell designed to accommodate for casting material shrinkage during curing in the cell.Type: GrantFiled: August 10, 1979Date of Patent: October 14, 1980Assignee: American Optical CorporationInventors: Bertram R. Goodwin, Bradford Canterbury
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Patent number: 4212621Abstract: A molding system for large-scale containers using closely-spaced bladders, one inside the other, to contain a resinous material that will harden to form a rigid container. The bladders float in a liquid of the same specific gravity as that of the resinous material, and the inner bladder is filled with a liquid of the same specific gravity. The inner bladder may be filled first to establish the size or volume of the container, and then the resinous material may be filled between the inner and outer bladder layers whereat it will harden to form the container.Type: GrantFiled: June 21, 1979Date of Patent: July 15, 1980Inventor: Paul E. Michelotti
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Patent number: 4184822Abstract: The apparatus utilizes a mandrel in a substantially ring or cylindrical shape about which is disposed inwardly pressure supplying means, an annular cavity disposed between the mandrel and pressure means, and means for supplying heat to the mandrel to initiate its thermal growth during curing of the belting. The metal of the mandrel has a high coefficient of thermal expansion which during use applies radial outward pressure against the belt body being cured.Type: GrantFiled: August 24, 1977Date of Patent: January 22, 1980Assignee: The Gates Rubber CompanyInventor: Nile L. Schwabauer
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Patent number: 4157887Abstract: A press tool for production of moulded ceramic articles from powder material includes a lower tool part adapted to be supported on a press table and carrying a lower die. A matrix shell encircles the lower die and is mounted to move up and down relatively to it. An upper tool part is adapted to be connected to the plunger of the press and carries an upper die which on lowering of the plunger of the press projects into the matrix shell. To fill the powder material into the cavity defined by the lower die and the matrix shell, an annular hopper in the form of an funnel encircles the upper die and is mounted to slide axially thereon. The hopper has an annular outlet facing radially inwards and opening into the cavity when the hopper is in its lower position with respect to the upper die but closed by the upper die when the hopper is in a raised position relatively to the upper die.Type: GrantFiled: February 24, 1978Date of Patent: June 12, 1979Assignee: Gebruder Netzsch, Maschinenfabrik GmbH & Co.Inventor: Gunther Sothje
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Patent number: 4148597Abstract: An apparatus and method for molding structural parts from fiber reinforced plastic composite. The apparatus is comprised of a rigid container, one or more pads of silicone rubber housed inside the container to exert pressure on the part, and one or more expandable diaphragms housed inside the container to control the pressure exerted on the part by the pads. The method used to mold a complex-shaped part from fiber reinforced plastic composite material is to lay up the part on the pads and place the pads, together with the part, between the diaphragms which are housed in the container. The container is then closed and placed in a temperature control chamber and the diaphragms connected to an external pressure control system, after which the part is cured by increasing the temperature of the chamber to the curing temperature of the part, while at the same time controlling the pressure exerted on the part by controlling the pressure in the diaphragms.Type: GrantFiled: September 1, 1977Date of Patent: April 10, 1979Assignee: Northrop CorporationInventor: George E. Larsen
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Patent number: 4128375Abstract: The rigid top pressing punch of a press for producing plates or the like is haped in accordance with the inner shape of the plate or the like to be produced. An elastic membrane, which establishes the top boundary, i.e., closes the cavity of a mold, is held at its edge shaped to the dimensions of the eventual plate, and is provided with an annular groove corresponding to the foot of the plate. Pulverulent porcelain composition is distributed on the membrane in the area determined by the edge having the holding action structure. The cavity defined by the membrane is filled with a pressure medium. After lowering the pressing punch, pressure can be applied through the pressure medium to the pulverulent porcelain composition distributed on the membrane in a pressing position. The elastic membrane in its relaxed position corresponds to the shape of the lower surface of the plate or the like, is made with an even, minimum thickness over substantially its whole area and has sufficient inherent strength.Type: GrantFiled: June 6, 1977Date of Patent: December 5, 1978Assignee: Dorst-Keramikmaschinen-Bau Otto Dorst u. Dipl.-Ing. Walter SchlegelInventor: Rolf E. R. Schubart
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Patent number: 4105388Abstract: A press for molding large sheets around a forming surface which includes an elastic press pad, a first frame member on the side of the press pad away from the working surface thereof, the first frame member having a top wall and side walls forming a pressure cell area therebetween, an elastic diaphragm in the pressure cell area in contact with the press pad, a second frame member formed in a generally L-shaped configuration to encompass and hold an annular bead of the elastic diaphragm, a trough-shaped supporting member positioned adjacent the end walls of the first frame member and the press pad such that a gap is formed between the end walls and the supporting member, a movable seal strip positioned in the gap to prevent the press pad from being pressed out of the pressure cell area when the elastic diaphragm is expanded, and a supporting strip attached to the end walls of the first frame member at a point within the pressure cell area to secure the press pad within the pressure cell area.Type: GrantFiled: December 20, 1976Date of Patent: August 8, 1978Assignee: Asea AktiebolagInventor: Keijo Hellgren
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Patent number: 4046499Abstract: A method for avoiding cracking of the molded body during the decompression step in an isostatic pressing method of molding. The powders to be molded are housed in a shaping rubber mold, are molded under pressure, and the improvement is characterized by supplying forcibly gas between the outer peripheral surface of a molded body or a shaping thin rubber bag where the molded body is housed and the inner peripheral surface of the shaping rubber mold, the gas having a pressure higher than the isostatic pressure applied to the shaping rubber mold at the time when the shaping rubber mold begins to restore to its original state during the decompression step of the method. An apparatus for the said compression molding which is equipped with a specially designed pressure gas inletting device.Type: GrantFiled: January 14, 1976Date of Patent: September 6, 1977Assignee: Shinagawa Firebrick Co., Ltd.Inventor: Shinroku Saito
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Patent number: 4043730Abstract: An improved hydraulic press, comprising a base frame with an horizontal bed, to which two stationary heads, termed "fore head" and "rear head", respectively, are firmly secured, said heads being connected with one another by at least two cylindrical, parallel columns, whereon a movable positioning and pre-compression crosshead, operated by hydraulic jacks, is slidingly fitted, whereby to act on a movable punch, located opposite to a stationary die, acting both punch and die, on the recess of a bottom mold; being the pressure on the movable punch, working on the recess of the bottom mold, being exerted through a pad made of an elastically flexible material, interposed between said crosshead and said fore head, it being possible to have said pad filled with a pressurized liquid.Type: GrantFiled: April 28, 1976Date of Patent: August 23, 1977Inventor: Luigi Bettonica
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Patent number: 4017572Abstract: An improved molding apparatus is described for use with relatively light weight molds, particularly molds for articles having a plurality of voids therein. A light weight two-piece mold, one-half being substantially rigid and the other relatively flexible, is disposed in a jig. The two halves of the mold are held in sealing relationship by inserting a hollow inflatable bag between the exterior of the relatively flexible mold piece and the interior wall of the adjacent jig member and inflating said bag to a pressure superior to that exerted by the expanding foam mix in the mold.The use of the improved apparatus obviates the need for molds of high structural strength (and hence excessive weight) and gives molded articles, particularly those of complex configuration, which are free from flashing.Type: GrantFiled: April 15, 1975Date of Patent: April 12, 1977Assignee: The Upjohn CompanyInventors: Raymond L. Magone, Samir N. Saaty
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Patent number: 3969051Abstract: The vulcanizing apparatus of the present invention can be used for vulcanizing spliced sections of rubber belting, sheeting or the like. The apparatus includes an upper platen assembly and a lower platen assembly. The upper platen assembly includes an upper frame member and a sheet-like platen member having a relatively rigid platen surface. The platen member is affixed to an upper frame member. A heat exchanger, a heating pad and a layer of insulation are sandwiched between the sheet-like platen member and the upper frame member. The lower platen assembly includes a lower frame member and a sheet-like platen member having a relatively rigid platen surface, below which are interposed in sandwiched relationship a heat exchanger, a heating pad, and a layer of insulation. The layer of insulation rests upon a flexible diaphragm that has a flexible surface substantially co-extensive with the lower platen surface.Type: GrantFiled: June 13, 1975Date of Patent: July 13, 1976Assignee: D.G. Rung Industries, Inc.Inventor: Harry Hovila
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Patent number: 3964846Abstract: An apparatus for making transmission belts by assembling a belt sleeve or belt body in the conventional manner and placing them in a vulcanizing chamber. The belt body or sleeve is sandwiched between radially expansible and radially contractable members of the vulanizing chamber. Outward radial pressure is first applied to the belt body or sleeve and then a radial inward pressure is applied. Heat is simultaneously added to cure the body or sleeve.Type: GrantFiled: May 7, 1973Date of Patent: June 22, 1976Assignee: The Gates Rubber CompanyInventor: Robert H. Bliss