For Timing Period Mold Is Closed Or Period Molding Pressure Is Maintained Patents (Class 425/156)
  • Patent number: 11648719
    Abstract: A plasticization device includes: a cylinder having a supply port through which a material is supplied; a spiral screw configured to rotate inside the cylinder; a nozzle configured to discharge the material plasticized inside the cylinder; a heating unit provided between the supply port in the cylinder and the nozzle; a screw drive unit including a motor configured to rotate the screw; and a case configured to accommodate at least a part of the screw drive unit and having a first refrigerant flow path.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: May 16, 2023
    Assignee: Seiko Epson Corporation
    Inventor: Seiichiro Yamashita
  • Patent number: 10940634
    Abstract: A blow mold clamping apparatus and a blow molding system are disclosed.
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: March 9, 2021
    Assignee: UNILOY, INC.
    Inventor: John Scott Rosenbeck
  • Patent number: 10596745
    Abstract: The present invention relates to a mold for molding hollow bodies from parisons. It is the object of the invention to provide such a mold having a closing mechanism, which allows the mold to be securely held closed even under high pressure and which is in addition easy to clean. The object is achieved according to the invention by a two-part mold (1a, 1b) for molding hollow bodies, in particular containers, from parisons by way of a gaseous or liquid pressure medium introduced under pressure into the parison, in which at least a part of the mold (1a, 1b) is supported so it is rotatable about an axis of rotation (3), and therefore the two parts are transferable from an open position into a closed position, and wherein each mold part (1a, 1b) is connected to one end of a toggle lever (4a, 4b) so it is rotatable about an axis (5a, 5b) parallel to the axis of rotation (3).
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: March 24, 2020
    Assignee: KHS Corpoplast GmbH
    Inventors: Rolf Baumgarte, Michael Linke
  • Patent number: 10052805
    Abstract: A two-stages hydraulic booster device for mold functional components includes a first hydraulic control one-way valve serially connected between the solenoid directional control valve and the pumping chamber of the supercharger via a first oil passage; a second hydraulic control one-way valve serially connected between the solenoid directional control valve and the pressure accumulating chamber of the supercharger via a second oil passage. The solenoid directional control valve simultaneously supplying oil to the first and second hydraulic control one-way valves via the first and second oil passages, respectively, and the pressure for opening the second hydraulic control one-way valve is larger than that of the first hydraulic control one-way valve, thereby moving the back pressure formed in the first oil passage to open the second hydraulic control one-way valve to drive the piston to transform the low pressure oil into high pressure oil to move the mold functional components.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: August 21, 2018
    Assignee: HYDR-AUTO (YT) CO., LTD.
    Inventor: Shao-Yang Hung
  • Patent number: 9949492
    Abstract: An apparatus for making patties with a ground food product includes a housing including an inlet for receiving the ground food product. A mold plate is positioned at least partially within the housing and includes first and second mold cavities. The mold plate is rotatable about an axis to first and second mold positions. In the first mold position, the first mold cavity is positioned within the housing for receiving the ground food product and the second mold cavity is positioned outside the housing for removing a patty formed therein. In the second mold position, the second mold cavity is positioned within the housing for receiving the ground food product and the first mold cavity is positioned outside the housing for removing a patty formed therein.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: April 24, 2018
    Assignee: Blue Sky Innovation Group
    Inventor: Jeffrey W. Palese
  • Publication number: 20150008608
    Abstract: A method and apparatus for injection molding a foamed product. A short shot of formable resin is injected into a cavity (124) defined by respective inner surfaces (134,136) of a plurality of molding plates (120,122) at an amount less than a volume of the cavity (124), the resin comprising a chemical foaming agent. The injected resin is allowed to foam for a predetermined period of time, during which the injected foamable resin foams and expands to substantially fill the cavity (124) and a portion of an outer surface face of the foamable resin contacts the respective inner surfaces (134,136) of the molding plates (120,122). Pressurized gas is injected into the cavity (124) after the predetermined time has elapsed to urge the skinned outer surface of the foamed resin against the inner surfaces (134,136) of the molding plates (120,122).
    Type: Application
    Filed: January 25, 2013
    Publication date: January 8, 2015
    Inventor: Kevin Bradley AINE
  • Patent number: 8556504
    Abstract: A micro-structured reference element for use in a sensor having a substrate and a dielectric membrane. The reference element has an electrical property which changes its value on the basis of temperature. The reference element is arranged with respect to the substrate so that the reference element is (i) electrically insulated from the substrate, and (ii) thermally coupled to the substrate. The reference element is arranged on the underside of the dielectric membrane. The reference element and side walls of the substrate define a circumferential cavern therebetween, which is also bounded by the dielectric membrane, arranged between them. The dielectric membrane is connected to the substrate. A surface area of the reference element which is covered by the dielectric membrane is greater than or equal to 10% and less than or equal to 100% of the possible coverable surface area.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: October 15, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Ingo Herrmann, Daniel Herrmann, Frank Freund, Ando Feyh, Martin Eckardt
  • Publication number: 20130221574
    Abstract: A plastic injection mold which allows extracting the air from inside it during the injection process, and an extraction method, where the mold includes closing means, one or more injection cavities provided with at least one injection nozzle for introducing the hot material in a liquid state and at least one ejector device formed by a housing for an ejector pin responsible for extracting the part already molded, where an air duct connected to a vacuum pump or a suction device intercepts the housings of the ejector pins causing a suction of the air from inside the mold.
    Type: Application
    Filed: September 29, 2011
    Publication date: August 29, 2013
    Inventors: Alberto Navarra Pruna, Jorge De Fortuny Pala
  • Patent number: 7431870
    Abstract: A method for the automated setting-up of an injection molding machine, the machine for manufacturing injection molded parts and including an injection screw and a configurable injection velocity, including the steps of: manufacturing one of more parts with the machine; determining an injection pressure profile by measuring injection pressure as a function of elapsed injection time with the machine configured with a substantially constant, desired injection velocity; measuring injection velocity as a function of elapsed injection time and determining a profile of the measured injection velocity; defining a mean pressure profile from the pressure profile in a regime of substantially constant measured injection velocity profile; adjusting the velocity profile over at least a portion of an injection velocity phase in response to the pressure profile to reduce differences between the pressure profile and the mean pressure profile, thereby tending to lessen irregularities in the pressure profile.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: October 7, 2008
    Assignee: Moldflow Pty. Ltd
    Inventor: Russell Gordon Speight
  • Patent number: 6780354
    Abstract: A method employing a casting head having a variably displaceable cavity surface. The casting head comprises a cavity, at least partially formed by plurality of surfaces, including a carrier surface adjacent the cavity, and a variably displaceable drive surface for controlling a pressure of a viscous casting material in a region proximate the carrier surface. In one embodiment of the invention, the casting head further comprises a doctor blade, disposed proximate the carrier surface, forming a gap therebetween for egress of the casting material. In another embodiment of the casting head, the variably displaceable drive surface is comprised of a piston. The piston is actuated by a driver-controlled motor according to a pre-determined displacement program, or according to the level of the casting material in the cavity.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: August 24, 2004
    Assignee: The DirectTV Group, Inc.
    Inventors: Klaus Robinson, Matthew T. Sinnott, Elena Sherman
  • Publication number: 20040115296
    Abstract: An insert retention apparatus for use with an insert mold tool includes an actuator having a power system, a drive assembly and a control unit. The retention apparatus also includes an insert mold tool and a retention post operably connected to the drive assembly of the actuator. The retention post is preferably configured for movement through the insert mold tool between a first position wherein the retention post engages and maintains a stamping in fixed position within the insert mold tool while a liquid resin is injected into the insert mold tool to a second position wherein the retention post is disengaged and moved relative to the stamping prior to the resin completely curing. The invention also relates to a method of forming an overmold on a stamping.
    Type: Application
    Filed: September 29, 2003
    Publication date: June 17, 2004
    Inventor: Terry M. Duffin
  • Patent number: 6589038
    Abstract: A casting head having a variably displaceable cavity surface. The casting head comprises a cavity, at least partially formed by plurality of surfaces, including a carrier surface adjacent the cavity, and a variably displaceable drive surface for controlling a pressure of a viscous casting material in a region proximate the carrier surface. In one embodiment of the invention, the casting head further comprises a doctor blade, disposed proximate the carrier surface, forming a gap therebetween for egress of the casting material. In another embodiment of the casting head, the variably displaceable drive surface is comprised of a piston. The piston is actuated by a driver-controlled motor according to a pre-determined displacement program, or according to the level of the casting material in the cavity.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: July 8, 2003
    Assignee: Hughes Electronics Corporation
    Inventors: Klaus Robinson, Matthew T. Sinnott, Elena Sherman
  • Patent number: 6267577
    Abstract: A transfer molding apparatus, wherein a top-half mold and a bottom-half mold form a plurality of cavities interconnected, and wherein a pressure adjuster reduces the pressure of the cavities every time a specified amount of resin is supplied into any of the plurality of cavities.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: July 31, 2001
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hiroyuki Nishi, Akira Sugai
  • Patent number: 5850107
    Abstract: An apparatus for separating individual contact lens mold assemblies, the assemblies each being a front curve mold half and a back curve mold half, each mold half having annular circumferential flanges, is included. The apparatus includes a device for applying steam to the back curve mold half to form a temperature gradient from the front mold half to the back mold half. The apparatus also includes a second device to pry the mold halves apart.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: December 15, 1998
    Assignee: Johnson & Johnson Vision Products, Inc.
    Inventors: Ture Kindt-Larsen, Stephen Robert Beaton, Wallace Anthony Martin, Stephen Craig Pegram, Craig William Walker
  • Patent number: 5811037
    Abstract: A method is disclosed of operating an injection molding machine including a hydraulic device (1) which has an asynchronous main drive motor (10) driving a hydraulic pump (2). The injection molding machine is operated in an injection molding cycle with a cooling phase and a phase in which an injection molding tool is opened following the cooling phase. It is determined before commencement of the injection molding cycle if the duration of the cooling phase is above a minimum duration. If the duration of the cooling phase is above the minimum duration the asynchronous main drive motor (10) is switched off after or at commencement of the cooling phase and is switched on again before commencement of the phase in which the injection molding tool is opened. Electrical energy is saved by switching off the main drive motor in dependence on the cycle.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: September 22, 1998
    Assignee: Dr. Boy GmbH
    Inventor: Franz Josef Ludwig
  • Patent number: 5667192
    Abstract: A mold especially adapted for forming precast, waffle-shaped concrete panels employs a one-piece mold body of flexible plastic sheet material to which rigid side rails are secured by tongue and groove longitudinal joints. The mold may be rapidly stripped and reset due to a hinge action provided by partial sides of the flexible body to which the rigid side rails are joined. The side rails and other structural features provide a simple mold structure that may be readily and efficiently employed for on-site production of panels. The configuration of the side rails and associated joints facilitates the replacement of a wornout mold body. A cover may be placed over the mold body while the concrete cures and automatically lifted therefrom after a predetermined time to allow the concrete to cool. Recess formers and connector covers for the panels are provided for appearance and security.
    Type: Grant
    Filed: January 10, 1995
    Date of Patent: September 16, 1997
    Assignee: Waffle-Crete International, Inc.
    Inventor: David A. Van Doren
  • Patent number: 5176859
    Abstract: An apparatus and method for controlling an injection molding device having a mold cavity therein use of periodically generated signals representative of the mold cavity pressure and mold cavity volume. These signals are used to control the magnitude of the clamping force imposed on a movable mold member. During a first time period following closure of the gate, in response to the signals representative of cavity pressure and cavity volume, the clamping force imposed on the movable mold member is adjusted to maintain, in closed loop fashion, cavity pressure constant. During a second time period following closure of the gate, in response to the signal representative of the cavity volume, the clamping force imposed on the movable mold member is adjusted to maintain, in closed loop fashion, cavity volume constant.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: January 5, 1993
    Assignee: Philips and Du Pont Optical Company
    Inventor: Kenneth W. Leffew
  • Patent number: 5119866
    Abstract: A method and apparatus for controlling a casting process for obtaining a cast product from a cast substance injected into a die cavity of a pair of casting dies by a fluid-operated injecting plunger and pressurized by a fluid operated squeezing plunger after the completion of an injecting process. Actual movement of the squeezing plunger is controlled to copy a desired curve with respect to a desired movement of the squeezing plunger versus an elapse of time from the start of the actual movement of the squeezing plunger.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: June 9, 1992
    Assignee: UBE Industries, Ltd.
    Inventor: Takeshi Mihara
  • Patent number: 5030395
    Abstract: A method and an apparatus for pressure control of a motor-operated injection-molding machine, which are capable of effecting various modes of multi-stage pressure control smoothly without mounting a special servomotor on the injection-molding machine or replacing servomotor with another servomotor. When a shift is made from an injection process into a first pressure hole stage of a pressure hold process, or from each pressure hold stage to a pressure hold stage subsequent thereto, a central processing unit for numerical control calculates a modification amount. This modification amount is obtained by dividing a value, obtained by subtracting a maximum injection pressure or a torque limit value for a preceding pressure hold stage from a torque limit value for a subsequent pressure hold stage, by a required modification frequency. The modification frequency is obtained by dividing a predetermined switching time for the subsequent pressure hold stage by a hold pressure control operation execution period (S7).
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: July 9, 1991
    Assignee: Fanuc Ltd.
    Inventors: Masao Kamiguchi, Minoru Kobayashi, Noriaki Neko
  • Patent number: 4954063
    Abstract: This invention relates to an injection pressure control apparatus for a die cast machine and an injection mold machine. In the injection pressure control apparatus, it detects whether the pressure increase state of the instance when the pressure of the injection cylinder is increased through a pressure increasing circuit is normal or not. When detecting the above state, the pressure change obtained at the instance when the pressure increasing circuit is operated is detected between two points, of which it is determined whether the time spent therebetween is within an allowable time or not and the result is indicated. Moreover, the pressure detected after the pressure increasing circuit was operated and a predetermined period of time has passed is determined whether it is within a predetermined allowable range or not and the result thereof is indicated.
    Type: Grant
    Filed: March 29, 1989
    Date of Patent: September 4, 1990
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventor: Norihiro Iwamoto
  • Patent number: 4720364
    Abstract: A technique directed to a process for injection molding fiber-reinforced thermoset plastic articles is disclosed. The technique includes forming a mixture of short lengths of reinforcing fibers with a thermosetting resin in a predetermined fiber-to-resin ratio and introducing the mixture to an injection molding cylinder. The volume of mixture introduced is at least a multiple of two of the volume of the mold chamber so that the injection plunger traverses the intersection between the molding cylinder and a stuffer cylinder a single time for a multiplicity of molding shots to minimize fiber breakage and balling. The injection plunger is adapted to precompact the mixture by being forced forward until a predetermined high pressure is sensed, indicating a hydraulically locked condition of the plunger wherein substantially all entrapped gases have been expressed from the mixture and there exists no substantial forward movement of the plunger.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: January 19, 1988
    Assignee: Trans Plastics, Inc.
    Inventors: Abe J. Kauffman, Robert S. Black, Arthur J. Stanley
  • Patent number: 4714579
    Abstract: Plastics-forming materials are shaped in a mold tool sealed by an associated closing unit. Lifting elements the stroke of which can be limited and controlled are associated with the mold tool. Shaping is accomplished by filling the mold cavity with reaction mixture while the mold tool halves are not completely sealed, sealing the filled mold and keeping the mold sealed until the article is completely cured. This method and apparatus are particularly useful in the production of dimensionally accurate geometrically complicated shaped articles.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: December 22, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinrich Boden, Walter Schneider
  • Patent number: 4690629
    Abstract: An injection molding machine for small-sized articles of thermoplastic synthetic resin comprises a hydraulically pressurizable injection head cylinder operable on an injection cylinder of an injection unit for injecting molding material into a mold, a hydraulically pressurizable clamping cylinder operable on one of a pair of mold members of the mold for opening and closing the mold, and a booster operatively connected to both the injection head cylinder and the clamping cylinder for converting pneumatic pressure into high hydraulic pressure to actuate the two cylinders in timed relation to each other.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: September 1, 1987
    Assignee: Yoshida Kogyo K. K.
    Inventor: Yoichi Horikawa
  • Patent number: 4439127
    Abstract: A machine for the blow molding of synthetic resin hollow workpieces with a unit for shutting parted blow molds and with a turntable moved in steps, with a number of rests evenly spaced round the axis of the turntable for blown hollow workpieces. The rests may be moved into a handing over position in the parting plane (E) of the blow mold shutting unit and into at least one after-processing station. There is a blow stick which is supported by a blow stick carriage moved horizontally in this parting plane between the blow position at the blow mold shutting unit and this handing over position. The blow stick carriage is indexed in the blow position in a machine bed. The blow mold shutting unit has horizontal guides for the blow mold supports only at the side furthest from the blow stick carriage.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: March 27, 1984
    Inventor: Walter Frohn
  • Patent number: 4427355
    Abstract: This core puller assembly includes a bank of interconnected core puller units each having a cylinder, and a piston mounted within the cylinder and having a rearwardly extending connecting rod. Each core puller unit includes a core puller bar disposed in side-by-side relation below the cylinder and connected to the piston connecting rod for movement with said connecting rod. Each cylinder carries front and rear guide units receiving the core puller bar in sliding relation to guide the core puller bars into the mold assembly.The cylinders are operated by a pneumatic air supply which includes a surge tank and a control system for controlling the supply of pressurized air to the cylinders.
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: January 24, 1984
    Assignee: MCIBS, Inc.
    Inventor: Oskar F. Vatterott
  • Patent number: 4392800
    Abstract: A press for compressing pulverulent materials into both concave and convex pieces includes a press frame, a die carying plate, upper and lower punches, holders for carrying the punches and control devices for controlling the displacement of the upper and lower punches. The press comprises also a first piston-cylinder device for controlling the displacement of the die carrying plate, a second piston-cylinder device fastened to the frame and supporting the die carrying plate, levers arranged above the die carrying plate and having one end pivoted to the frame and sliders slidable on the opposite ends are provided in the press. The first piston cylinder device acts on the other ends of the levers to exert thereon a pressure depending on the distance of the sliders from the other ends of the levers.
    Type: Grant
    Filed: February 2, 1981
    Date of Patent: July 12, 1983
    Assignee: Merisinter S.p.A.
    Inventor: Gennaro Apuzzo
  • Patent number: 4382762
    Abstract: Thermoforming equipment includes a solid state sensor adapted to determine when a sheet of thermoplastic material has been clamped between a forming mold and a heating platen. Clamping force is provided by a cutter blade carried by said mold around the periphery thereof. Electronic control circuitry responsive to the sensor maintains the thermoplastic sheet in clamped relation without being severed by the blade. After the thermoplastic sheet has been formed into an article defined by the mold, the mold and platen are permitted to continue to close beyond the point sensed by the sensor, permitting the blade to penetrate the sheet and sever the formed article therefrom.
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: May 10, 1983
    Assignee: R & G Mold Company Inc.
    Inventor: Frank Schepp
  • Patent number: 4381272
    Abstract: An extruder system has an extruder provided internally with a worm. A source of an additive fluid under pressure is connected to a conduit opening into the barrel. An upstream valve and a downstream valve are provided in this conduit and a pressurizable fluid reservoir is provided in the conduit between the valves. The extruder is continuously rotated in the barrel to plastify a resin therein. The valves are alternatively opened and closed, that is one is open when the other is closed and vice versa, so that a fluid first flows from the source through the upstream valve into the reservoir and then from the reservoir through the downstream valve into the barrel to be mixed by the worm with the plastic resin therein. The reservoir can be a cylinder having a piston advanced when the downstream valve is opened to force the charge of additive fluid in the reservoir into the barrel.
    Type: Grant
    Filed: May 21, 1981
    Date of Patent: April 26, 1983
    Assignee: Battenfeld Maschinenfabrik GmbH
    Inventor: Jurgen Ehritt
  • Patent number: 4344142
    Abstract: Rubber-molding presses, which are closed manually upon installation of pieces of rubber compound, are opened automatically by a system which continuously calculates and recalculates the correct cure time and is actuated when the calculated cure time equals the elapsed cure time. An interval timer starts running from the time of mold closure, and the temperature within the mold cavity is measured often, typically every ten seconds. The temperature is fed to a computer which also is given access to the time-temperature cure data for the compound being molded, and the computer calculates and recalculates every time the data as to temperature is presented, until the total picture of time and temperature presents to the computer the time at which the material is fully cured. Then the computer signals for automatic opening of the mold press.
    Type: Grant
    Filed: August 6, 1975
    Date of Patent: August 10, 1982
    Assignee: Federal-Mogul Corporation
    Inventors: James R. Diehr, II, Theodore A. Lutton
  • Patent number: 4313668
    Abstract: A coiled roll of film, which exhibits curling, is provided with longitudinal corrugations at its leading edge by a film processing apparatus, thereby providing a straight film edge well adapted for insertion into a film development machine without requiring the use of a separate leader. In the film processing apparatus, which comprises a pair of grooved, horizontally opposed platens which, upon insertion of a film therebetween, contact each other, impressing corrugation into the film, and then automatically retract to permit removal of the worked film edge from between the platens, a safety switch is provided to enable retraction of the platens, should automatic retraction not occur, to assure that the film end may be removed from the apparatus after it has been worked without being damaged.
    Type: Grant
    Filed: August 21, 1978
    Date of Patent: February 2, 1982
    Inventors: Henry F. Hope, Stephen F. Hope
  • Patent number: 4235833
    Abstract: A method and apparatus for forming a thermoset in-the-mold coating on a hot, cured glass fiber reinforced thermoset resin substrate by (1) separating the mold halves slightly while maintaining a seal with the shear edge, (2) injecting an in-the-mold coating resin in a stream which flows parallel from the injector onto a surface of the substrate, and (3) closing the mold and curing the coating under pressure. The separation and of the mold halves is performed by the conventional mold ram. Preferably the mold surface forming the coated surface of the substrate is roughened.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: November 25, 1980
    Assignee: The General Tire & Rubber Company
    Inventors: Sigurdur I. Arnason, Edward J. Kleese
  • Patent number: 4171940
    Abstract: Strips of photographic film are processed through a film developing machine which transports the film by means of rollers. Curling of the film around the rollers of the machine is avoided even though no separate leader is attached to the film.This is accomplished by first inserting one end of the film strip into a device which has an open slot defined by a pair of platens which face each other. At least one platen is heated and at least one platen has corrugations in its slot-defining surface. Provisions are made for responding to insertion of the strip into the slot to close the platens upon the inserted strip, and maintaining these platens so closed for a length of time sufficient to impress the platen corrugations into the film. The slot is then reopened, the strip is withdrawn, and inserted into the nip of the input rollers to the developing machine.Specific embodiments of the corrugating device are also taught.
    Type: Grant
    Filed: January 3, 1977
    Date of Patent: October 23, 1979
    Inventors: Henry F. Hope, Stephen F. Hope
  • Patent number: 4147486
    Abstract: A mechanical press includes a plurality of cylinders to provide different fluid pressures to a lower mold against an upper mold to mold plastic parts. A pair of accumulators sequentially apply a low pressure to the cylinders for a predetermined time during the initial heating period and a high pressure for a predetermined time during the final molding period. A control valve controls the rate at which the high pressure is applied.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: April 3, 1979
    Assignee: The Budd Company
    Inventor: Herbert A. Jahnle
  • Patent number: 4130385
    Abstract: The invention relates to the processing of photographic material such as photographic film which has a tendency to curl in roller type photographic processing equipment, without attaching a separate leader portion to the film. After removing the curl from an end portion of the film, it is processed in a roller type photographic processing equipment without curling around the transporting rollers.The invention also provides a method of making this leaderless processing possible. This is performed by deforming a portion of the photographic material so as to prevent the tendency to curl to allow positive self-leading through the roller type processing equipment. Another embodiment of the invention provides a one-piece, partially curled, photographic material wherein curl has been removed from a portion, thus making the film suitable for photographic processing equipment.Another embodiment provides an apparatus for preventing curl in a portion of photographic material.
    Type: Grant
    Filed: June 2, 1976
    Date of Patent: December 19, 1978
    Inventors: Henry F. Hope, Stephen F. Hope
  • Patent number: 4076475
    Abstract: A plastic injection machine injects at an initial higher pressure, with the opening of the injection nozzle valve being delayed to allow injection pressure to build up. When the mold is filled, the pressure applied by the machine is shifted to a low holding pressure which is maintained until the plastic beings to set up. A shouldered bronze thrust bearing transmits the high pressure from the hydraulic injection cylinders to the injection machine screw.
    Type: Grant
    Filed: August 27, 1976
    Date of Patent: February 28, 1978
    Assignee: Trueblood, Inc.
    Inventor: Raymond L. Trueblood
  • Patent number: 4019845
    Abstract: An injection-molding machine has a drive ram with a pressurizable chamber that can be connected either to the high-pressure side or the low-pressure side of a source of fluid under pressure. A control system operating this machine has a pressure-reducing valve with an inlet port connected to the high-pressure side of the source, an outlet port connected through a cut-off valve and a throttle to the chamber of the ram, and a pilot port pressurizable to control the pressure at this outlet port. A pressure-relief valve has an inlet port connected to the pressurizable ram chamber, an outlet port connected to the low-pressure side of the pressure source, and a pilot port pressurizable to control the pressure differential across this pressure-relief valve.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: April 26, 1977
    Assignee: Klockner-Werke AG
    Inventors: Hans Birkhofer, Arno Stohr, Werner Schrammel
  • Patent number: 3964850
    Abstract: An apparatus for forming and cutting thermoplastic sheets comprises a heater platen and base plate assembly with a toggle leverage assembly which brings the base plate assembly into and out of a closed relation with the heater platen with a sheet of thermoplastic material therebetween. The base plate assembly has a strip of elastic material mounted thereon, one or more mold (forming) sections, cutting blades defining the peripheral outline of the mold sections and a seal-off plate slidably mounted on the base plate assembly and resting on the elastic strips.
    Type: Grant
    Filed: November 27, 1974
    Date of Patent: June 22, 1976
    Assignee: Camid Intermatic
    Inventor: Frank Carnegie, Jr.