Patents by Inventor Bruno Stillhard

Bruno Stillhard has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7004746
    Abstract: The novel solution provides a closing part comprising an electromechanical drive for a CD injection molding machine having a working stroke and a servicing stroke. The entire mold closing unit is characterized by the combination of a short-stroke crank mechanism which is operated by an electric motor and which is provided for the working stroke and of a central electromotive column-type nut drive for the servicing stroke. According to the invention, synchronous motors or asynchronous motors are used with corresponding servo boosters to realize servo axles. The central column drive is used as a control element of the closing force control, together with a force sensor for detecting the closing force, as an actual value transmitter and as a control device.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: February 28, 2006
    Assignee: Netstal-Maschinen AG
    Inventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
  • Publication number: 20040219258
    Abstract: The novel solution provides a closing part comprising an electromechanical drive for a CD injection molding machine having a working stroke and a servicing stroke. The entire mold closing unit is characterized by the combination of a short-stroke crank mechanism which is operated by an electric motor and which is provided for the working stroke and of a central electromotive column-type nut drive for the servicing stroke. According to the invention, synchronous motors or asynchronous motors are used with corresponding servo boosters to realize servo axles. The central column drive is used as a control element of the closing force control, together with a force sensor for detecting the closing force, as an actual value transmitter and as a control device.
    Type: Application
    Filed: June 4, 2004
    Publication date: November 4, 2004
    Applicant: Netstal-Machinen AG
    Inventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
  • Patent number: 6796783
    Abstract: The novel solution provides a closing part comprising an electromechanical drive for a CD injection molding machine having a working stroke and a servicing stroke. The entire mold closing unit is characterized by the combination of a short-stroke crank mechanism which is operated by an electric motor and which is provided for the working stroke and of a central electromotive column-type nut drive for the servicing stroke. According to the invention, synchronous motors or asynchronous motors are used with corresponding servo boosters to realize servo axles. The central column drive is used as a control element of the closing force control, together with a force sensor for detecting the closing force, as an actual value transmitter and as a control device.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: September 28, 2004
    Assignee: Netsal Maschinen AG
    Inventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
  • Publication number: 20040033141
    Abstract: The invention relates to a method for controlled driving of the cast axle (8) of pressure die casting machines, comprising a drive piston (15), wherein the forward and return motion of the piston (15) is carried out in a controlled manner. The invention is characterized in that the oil flow or oil pressure on the piston rod side is controlled/regulated by a pump (30) and additionally by a throttle valve (103) working in parallel at least during the filling phase, especially during the fast forward motion part.
    Type: Application
    Filed: January 10, 2003
    Publication date: February 19, 2004
    Inventors: Bruno Stillhard, Ronald Siegrist
  • Patent number: 6581670
    Abstract: A pressing-in unit for a hot-chamber pressure diecasting machine permits an electro-mechanical drive for the casting plunger. In order to absorb the moments of inertia of the drive which occur during the switch-over of the casting plunger drive from the mold filling phase to the after-pressure phase, a spring element in the form of a plastic component or a liquid spring is inserted between the casting plunger and the pusher rod moved by the electric drive, which spring element is compressed by the additional path which the pusher rod still covers after the braking of the motor. The extent of the compression is selected such that the resulting axial force which is exercised by the plastic component or by the liquid spring is sufficient for causing the desired after-pressure in the molten metal.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: June 24, 2003
    Assignee: Oskar Frech GmbH & Co.
    Inventors: Roland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard, Ronald Siegrist
  • Patent number: 6390175
    Abstract: A hot chamber die-casting machine has drive assemblies in the form of electrical servomotors instead of hydraulic cylinders for driving and pressing a feed bush to the nozzle. The feed rate of the servomotors is adjustable. In order to avoid the influence of heat from the smelter and the furnace, the rotational axes of the servomotors located above the smelter and the furnace are connected through an angle drive to the spindle drive and aligned approximately vertically. This makes it possible to achieve a time-optimized and precise feed regulation that is independent of temperatures which develop.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: May 21, 2002
    Assignee: Oskar Frech GmbH + Co.
    Inventors: Roland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard
  • Patent number: 6321826
    Abstract: A vertical adjustment device for a mold closing unit of a hot chamber die-casting machine is provided with a shear mechanism. An electrical servomotor is provided as a drive assembly for spreading the shear mechanism apart, with the axis of the servomotor being parallel to the guide surface for the shear mechanism and driving, through an angle transmission, a spindle oriented at less than 90° with respect to the drive axis of the servomotor. One end of each of the two lever pairs of the shear mechanism is connected pivotably with the closing unit or with the machine frame. The other ends are supported on the guide surface and the machine frame and on a guide surface of the closing unit.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: November 27, 2001
    Assignee: Oskar Frech GmbH + Co.
    Inventors: Roland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard
  • Patent number: 5911924
    Abstract: A method is disclosed for controlling an injection molding machine of the type having an injection screw drivable for axial movement within an extrusion cylinder by a drive-controlled servo motor through a mechanical transmission, to provide a filling phase, a dwell phase, and a plasticization phase, the servo motor having a velocity command signal input connection, and the molding machine having sensors for screw position and injection pressure. The method includes the steps of presetting desired values for at least one of the injection pressure and the screw position; sensing the respective one of the corresponding actual injection pressure and actual screw position; and transmitting non-zero velocity command signals to the drive-controlled servo motor during at least the plasticization phase, and preferably also the filling and dwell phases, to move the injection screw within the cylinder.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: June 15, 1999
    Assignee: ProControl AG
    Inventors: Ronald Siegrist, Bruno Stillhard, Hugo Blochlinger
  • Patent number: 5855829
    Abstract: So that the injection nozzle (1) in an electrically driven injection molding machine may be driven free of shock into engagement with the mold (10), a spring has been interposed until the present time. The invention now proposes to delete this spring. The injection nozzle (1) is clamped between the stationary mold (10) and the injection unit (4) by two tie bolts or shafts (9) by the electric motor drive. Initially, the injection nozzle (1) is driven into engagement free of shock, for instance by presetting a brake ramp. Thereafter, the nozzle engagement force is adjusted as a function of the injection force or the pressure of the injection material, as the case may be, by way of a corresponding control device. In this manner, a constant equilibrium of engagement pressure and the opening force in the pressure is established, with selectable initial engagement tension. The energy consumption of the drive motor is reduced.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: January 5, 1999
    Assignee: ProControl AG
    Inventors: Ronald Siegrist, Bruno Stillhard
  • Patent number: 5792483
    Abstract: A drive control apparatus for controlling a plurality of control variables of at least one electrically powered axle of a processing machine, such as an injection molding machine. Multivariable control means including internal signal processing and date storage means for an open and closed-loop control of phase angle, current input and velocity are dominating process computer means for a lag-free control of the control variables.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: August 11, 1998
    Assignee: Vickers, Inc.
    Inventors: Ronald Siegrist, Bruno Stillhard, Hugo Blochlinger
  • Patent number: 5348463
    Abstract: A device for generating nozzle contact pressure for the nozzle of a plasticizing and injection unit includes a spindle drive system and a measuring sensor to detect when an appropriate nozzle contact pressure has been achieved. The device generates nozzle contact pressure and also makes it possible to adjust and set the contact pressure of the nozzle.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: September 20, 1994
    Assignee: Klockner Ferromatik Desma GmbH
    Inventors: Ralph Keitel, Bruno Stillhard
  • Patent number: 5266874
    Abstract: A drive arrangement for an injection molding machine (1) embodies a linear drive (5,10,11) for moving and/or locking mold mounting plates (2,3), or rather the molds mounted thereon. The linear drive is provided with at least one toothed rack (5) which on the drive output side is in direct functional connection with the mold mounting plate (3), and on the drive input side presents series of teeth (12a,12b) that mesh with at least one drive gearwheel (16,17).
    Type: Grant
    Filed: November 1, 1990
    Date of Patent: November 30, 1993
    Assignee: Vickers, Incorporated
    Inventor: Bruno Stillhard
  • Patent number: 4191726
    Abstract: A process of manufacturing molded parts using a mold with relatively movable parts enclosing a mold cavity which is fed with plasticizable material, comprises directing grains of the plasticizable material into a vertically elongated vestibule having a lower end connected to the feed of the mold cavity and directing hot gases into the lower end of the vestibule and upwardly through the plasticizable material therein to make the material weldable and, thereafter, directing the weldable material into the cavity under pressure. The device for carrying out the process includes a feed conduit which is connected into the cavity which is disposed below a vertically elongated vestibule which has a closed top and a bottom opening into the conduit.
    Type: Grant
    Filed: March 17, 1978
    Date of Patent: March 4, 1980
    Assignee: Gebrueder Buehler AG
    Inventors: Bruno Stillhard, Hans Naf
  • Patent number: 4158540
    Abstract: A process of manufacturing molded parts using a mold with relatively movable parts enclosing a mold cavity which is fed with plasticizable material, comprises directing grains of the plasticizable material into a vertically elongated vestibule having a lower end connected to the feed of the mold cavity and directing hot gases into the lower end of the vestibule and upwardly through the plasticizable material therein to make the material weldable and, thereafter, directing the weldable material into the cavity under pressure. The device for carrying out the process includes a feed conduit which is connected into the cavity which is disposed below a vertically elongated vestibule which has a closed top and a bottom opening into the conduit.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: June 19, 1979
    Assignee: Gebruder Buhler AG
    Inventors: Bruno Stillhard, Hans Naf
  • Patent number: 3954046
    Abstract: The valve arrangement includes four main control valves connected in a bridge circuit connected, at one end of a first diagonal, to a source of fluid under pressure and, at the other end of the first diagonal, to a fluid reservoir. Opposite ends of a second diagonal of the bridge are connected to inlet and outlet ports of the operated device. The arrangement includes two pressure adjusting valves, each connected to a respective pair of main control valves. In one bridge circuit, the main control valves are pressure limiting valves and each pair of main control valves includes one main control valve in one branch of the bridge circuit and another main control valve in the other branch of the bridge circuit.
    Type: Grant
    Filed: March 13, 1974
    Date of Patent: May 4, 1976
    Assignee: Gebrueder Buehler AG
    Inventor: Bruno Stillhard