Pre-form Patents (Class 425/DIG38)
  • Patent number: 6030568
    Abstract: A method for producing a fibre reinforced three-dimensional product comprises depositing of long fibers in a mould consisting of a frame in which a carrier net for the fibers is suspended. The individual layers of a formed plane laminate are positioned in such a manner that only a first end is secured at a frame side. Said first ends are secured at different frame sides. In this manner it is possible, in a pressing procedure giving the product is three-dimensional shape, to obtain a virtually even distribution of the fibres, even in areas which are subjected to the longest move away from the plane original laminate. In this manner sound well-defined properties are obtained in the three-dimensional product formed.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: February 29, 2000
    Inventor: Torben Vestergaard
  • Patent number: 5061165
    Abstract: A tool for holding threaded inserts in a rotational mold includes a stud which projects within the mold cavity and which has a diameter substantially equal to the minor diameter of the threads of the insert. A spring loaded detent on the stud is received by the internal threads of the insert for holding the insert firmly against the inner wall of the mold yet permitting simple removal of the molded part. A retractor mechanism for using the tool with threaded inserts placed across the axis of removal of the molded part, is also taught.
    Type: Grant
    Filed: November 6, 1990
    Date of Patent: October 29, 1991
    Assignee: Kelch Corporation
    Inventor: Gary R. Guzikowski
  • Patent number: 4634572
    Abstract: A system for automatically consolidating a plurality of metallic or ceramic (or mixtures thereof) powder preforms is disclosed. The system comprises an assembly container wherein a consolidation container is filled with hot consolidation particles for facilitating the consolidation, and a hot preform to be consolidated thereby. The atmosphere of the assembly container is maintained hot and inert or reducing during assembly of the consolidation charge. Further disclosed are means for automatically delivering the consolidation containers, consolidation particles and preforms to the assembly container. The system includes means for conveying the consolidation containers to a press for consolidation, for separating the containers from the consolidation particles and consolidated preform after pressing, and for recycling the consolidation particles and consolidation containers.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: January 6, 1987
    Assignee: Metal Alloys, Inc.
    Inventor: Robert D. Lichti
  • Patent number: 4470795
    Abstract: Apparatus for the manufacture of a video disc caddy sleeve comprising folding platens, an intermediate spacer plate with indentations on the leading edge, and a selective heating means. Spacer plate causes plastic sheet to bend in the middle while folding platens close to a folded up position. Indentations on the leading edge act to keep label, already adhered to plastic sheet, from tearing while sheet is being bent into a U-shaped enclosure.
    Type: Grant
    Filed: November 23, 1982
    Date of Patent: September 11, 1984
    Assignee: RCA Corporation
    Inventor: John J. Prusak
  • Patent number: 4465453
    Abstract: An apparatus for fabricating a disc record package from a flat plastic sheet, comprising a narrow intermediate section interposed between a pair of panel portions. The apparatus includes a housing, a pair of substantially rigid planar folding plates pivotally mounted for movement, a rigid spacer plate, a means for selectively heating the narrow intermediate section of the said flat plastic sheet, and a means for folding the said rigid planar folding plates. The folding plates are operable between a spreadout co-planar position and a folded up juxtaposed position. The rigid spacer plate acts to form the central portion of the folded plastic sheet during the molding operation. The means for moving the said spacer plate and folding plates are pneumatically operated cylinders.
    Type: Grant
    Filed: November 23, 1982
    Date of Patent: August 14, 1984
    Assignee: RCA Corporation
    Inventors: Robert L. Turner, John J. Prusak
  • Patent number: 4274276
    Abstract: A method for making a centrosymmetrical spider of a universal joint by extrusion molding involves pressing both end faces of a cylindrical blank the same distance towards the center of the blank to force the blank material radially outwards from the center of the cylindrical blank in a stream which is symmetrical relative to the two end faces and into a cavity of a split mold.Also disclosed is a molding apparatus for practicing the method. The apparatus includes a floating mold. One end of the apparatus can be rigidly fixed to a press for operating the punches which provide the extrusion pressure.
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: June 23, 1981
    Assignee: Etablissement Supervis
    Inventor: Karl Mettler
  • Patent number: 4138132
    Abstract: A protective cover for the bottom fork cases on the front of motorcycles is provided. The cover consists of a hollow, flexible sleeve of non-rigid plastic material which is contoured to the shape of the fork case. A longitudinal slit in the sleeve is provided to permit installation and removal of the sleeve. When made of the preferred material, plastisol, the sleeve is made by heating a form having the shape of the fork case, dipping the heated form in plastisol for a time dependent on the thickness of the coating desired, and then heat curing the coated form. The desired holes are cut in the coating with a heated gasket punch, the slit is made in the coating, and the coating is removed from the form.
    Type: Grant
    Filed: April 20, 1977
    Date of Patent: February 6, 1979
    Inventor: Keith H. Doyle
  • Patent number: 4060354
    Abstract: An energy saving and material conserving apparatus is provided for expanding and molding expandable thermoplastic polymer particles. Especially significant is the ability to produce molded objects of generally uniform density in the higher density range in the order of 4 - 15 pounds per square inch, or greater, as well as lower density molded objects due to improved control of the particle expansion.The particles are partially expanded in a vessel in a heated substantially dry atmosphere and agitated in a manner to provide uniform heating thereof. After an initial heating period to soften and partially expand the particles they are subjected to superatmospheric pressure to substantially prevent further expansion and are discharged and conveyed to a mold for further expansion therein.
    Type: Grant
    Filed: July 22, 1975
    Date of Patent: November 29, 1977
    Assignee: Foster Grant Co., Inc.
    Inventor: Stuart B. Smith