Air Ejection Patents (Class 425/DIG102)
  • Patent number: 5840352
    Abstract: An apparatus for producing a Fresnel plate has a mold assembly comprising movable and stationary molds coupled with each other. The mold assembly includes a Fresnel forming face formed on the inside of the movable mold. Melted resin is injected into the mold assembly for forming the Fresnel plate. At least one movable slit is formed through, and arranged inside, the movable mold along a circle concentric with the Fresnel plate and in intermittent or continuous fashion. The movable slit is used for blowing compressed air toward the Fresnel plate. The slit closely surrounds the center of the Fresnel plate. Ejector pins surround the Fresnel plate outside its Fresnel forming face.
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: November 24, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Mitsuru Shimizu, Yoshihiro Fujita
  • Patent number: 5368468
    Abstract: An air-operated knockout device for plastic molds for assisting ejection of molded plastic parts from a mold. The knockout device has a body in which is installed a knockout pin. The knockout pin is normally retained within the body, but can be axially shifted to an extended position to physically eject a molded part from a mold. The knockout pin also includes an air bypass to assist the knockout pin in the ejection of the molded part.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: November 29, 1994
    Inventor: Borislav Boskovic
  • Patent number: 5352398
    Abstract: A cap is attached to a mold core with a T-shaped connector instead of screws. The core cap has an air distribution channel and the core has cooling fluid distribution channels which are maximized by using the T-connector. The fluid distribution channels promote maximum cooling of the core, and, along with the air distribution channel, facilitates ejection of small articles from the mold.
    Type: Grant
    Filed: May 6, 1993
    Date of Patent: October 4, 1994
    Assignee: Eastman Kodak Company
    Inventor: Kevin P. Crowe
  • Patent number: 5141430
    Abstract: An injection molding apparatus creates a micro-cleanroom environment inside a mold cavity which can stay closed to airborne contaminants while ejecting and transferring the molded part out. The molded part is formed and solidified at a parting-line plane within the mold cavity, then is carried rearward on the movable mold insert to a second plane where it is stripped off and transferred out through a discharge aperture which is open when the mold cavity is in the second plane but closed off when in the first plane. The aperture faces substantially downward to prevent entry by upwelling thermal air currents. External supplied filtered gas can provide positive pressure through vents within the moldset's internal space. This maximizes mold and part cleanliness while speeding up mold-open cycle and may eliminate HEPA filters/enclosures and robots. Optical disks, lenses, food packaging and medical parts are suggested uses.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: August 25, 1992
    Assignee: Galic Maus Ventures
    Inventors: Steven M. Maus, George J. Galic
  • Patent number: 4874304
    Abstract: A porous mold for pressure slip casting, which includes: a surface porous layer having an average pore diameter of at most 20 microns and a thickness of 5 to 40 mm; an adhesive applied in a pattern to the rear surface of the surface porous layer to leave an unapplied portion on the rear surface; a coarse porous layer covering the adhesive applied and unapplied portions of the rear surface of the surface porous layer and made of a mixture of a liquid resin and a filler of a particle diameter of 0.1 to 5.0 mm at a volume ratio of 15 to 50:100, the coarse porous layer having a thickness of 5 to 30 mm; a sealing adhesive covering substantially the outer surface of the coarse porous layer; and a passage for water from and air into the coarse porous layer.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: October 17, 1989
    Assignee: Toto Ltd.
    Inventors: Haruyuki Ito, Akio Matsumoto
  • Patent number: 4719059
    Abstract: A material handling device for transferring a formed good from an injection molding machine includes a pair of spaced tracks. Inner ends of the tracks are positioned below a mold carried by the machine with the track positioned transversely to opening and closing movement of the mold by the machine. On the track is a slidable basket which may be moved from the track inner end to an outer end away from the machine. Basket movement may be effected by activation of a pneumatic drive formed as part of the track and attached to the basket. During forming of a good, the basket is moved under the mold. When forming is complete, the mold opens and the good ejected. The good falls into the basket which has a cushion-like surface to inhibit damage. Opening of the mold starts a first timing period which lapses to activate the pneumatic drive to move the basket and good to the track outer end for good removal. During this first timing period the mold closes to begin a next forming cycle.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: January 12, 1988
    Assignee: Duraco Products, Inc.
    Inventors: Robert C. Braun, Lyle L. Bigelow
  • Patent number: 4521367
    Abstract: An article having a flange is molded between a mold core and a unitary mold cavity, the flange being formed during the process as a consequence of the existence of an undercut existing in a first surface of the cavity. A ridge is provided on a second surface of the mold cavity adjacent the undercut. A fluid, i.e., air, is injected between the cavity and the molded article as the core and cavity separate in such a volume and at such a pressure as will maintain the article in substantially complete and constant contact with the core as the core and article are withdrawn from the cavity. The flange conforms to the cavity wall until the article is free from the cavity, and subsequently the molded article is separated from the mold core.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: June 4, 1985
    Inventor: J. Larry Underwood
  • Patent number: 4422998
    Abstract: A method of controlled ejection of a molded product in relation to orientation, speed of ejection and/or sterility is disclosed. The method is not dependent on auxiliary moving parts or vulnerable pins or blades. The molded product is ejected into a substantially enclosed guide conduit where the contours of the conduit substantially are regions of the parting surface and the cavity/ies. The guide conduit may be fairly holeproof, whereby a very fast ejection may be accomplished when the molded product is transported in an air stream in a manner similar to a pneumatic dispatch, not necessarily in a downward direction. The molded product may be kept sterile while it is transported in a stream of sterile air.
    Type: Grant
    Filed: April 22, 1982
    Date of Patent: December 27, 1983
    Inventor: Jens O. Sorensen
  • Patent number: 4413966
    Abstract: A fluid-release mold is disclosed. The mold includes a preformed, porous mold body having a mold face formed on a first exterior surface and a second surface. A groove is formed in the second surface. A tape covers the groove to form a conduit between the surface of the groove and the surface of the tape facing the groove. The conduit directs pressurized release fluid to the mold. A fluid impermeable backing material is disposed over the second surface of the mold body whereby egress of the fluid from the conduit is prevented except through the mold body in a direction away from the second surface.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: November 8, 1983
    Assignee: Wallace Murray Corporation
    Inventors: Walter H. Mills, Joseph T. Bilbrey, Sr.
  • Patent number: 4371329
    Abstract: The invention relates to confectionery moulding apparatus through which moulds, each containing at least one mould cavity having minute holes in its base, are traversed successively by a conveyor. After filling with confectionery and subsequently cooling the moulds pass in inverted relation beneath a demoulding unit which blows air through the holes in the bases of the mould cavities to eject the confectionery from the cavities. To reduce the force required for demoulding each mould has a backing plate spaced from the perforated base of the mould cavity or each mould cavity to define an air chamber and the demoulding unit includes an air pipe which is brought into sealing engagement with a hole in the backing plate of each mould to deliver air into the chamber and so effect demoulding.
    Type: Grant
    Filed: June 3, 1981
    Date of Patent: February 1, 1983
    Assignee: Baker Perkins Holdings Limited
    Inventor: Gordon Steels
  • Patent number: 3993727
    Abstract: A fluid-releasable mold for forming shaped ware including a porous mold body comprising at least 70% alumina, up to 15% ball clay and up to 15% talc is disclosed. A mold face is formed on one surface of the mold body and fluid-permeable conduit is provided in communication with a second surface of the mold body with means for sealing the fluid-permeable conduit to the second mold body surface to prevent the escape of fluid from the conduit other than through the mold body and out the mold face. The arrangement obviates the problem of gradual loss of porosity which has heretofore limited the service life of fluid-release molds of alumina, ball clay, and talc.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: November 23, 1976
    Assignee: Wallace-Murray Corporation
    Inventors: Rudolph A. Skriletz, Virgil D. Kendall
  • Patent number: 3952991
    Abstract: A mass of a hardenable synthetic resin such as polyurethatne is introduced into a mold cavity and is allowed to harden at least partially. Thereafter a piston having a face contiguous with an inside surface of the cavity is retracted away from the hardened mass in a bore formed in one of the mold halves. The mold is then opened and a gas is fed into the bore at a location between the retracted piston and the mass so as to pneumatically eject the hardened mass from the mold. The piston is formed with a plurality of circumferential grooves adjacent its face, these grooves filling with synthetic-resin material during use so as to form a seal around the piston. A pair of orifices open into the bore of this piston; one of the orifices is connected the source of pressurized gas, the other is connected to a passage opening into the atmosphere.
    Type: Grant
    Filed: April 12, 1974
    Date of Patent: April 27, 1976
    Assignee: Krauss-Maffei Aktiengesellschaft
    Inventor: Philipp Schneider