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).
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Patent number: 7004746Abstract: 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: GrantFiled: June 4, 2004Date of Patent: February 28, 2006Assignee: Netstal-Maschinen AGInventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
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Publication number: 20040219258Abstract: 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: ApplicationFiled: June 4, 2004Publication date: November 4, 2004Applicant: Netstal-Machinen AGInventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
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Patent number: 6796783Abstract: 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: GrantFiled: November 14, 2001Date of Patent: September 28, 2004Assignee: Netsal Maschinen AGInventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
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Publication number: 20040033141Abstract: 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: ApplicationFiled: January 10, 2003Publication date: February 19, 2004Inventors: Bruno Stillhard, Ronald Siegrist
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Patent number: 6581670Abstract: 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: GrantFiled: June 7, 2001Date of Patent: June 24, 2003Assignee: Oskar Frech GmbH & Co.Inventors: Roland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard, Ronald Siegrist
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Patent number: 6390175Abstract: 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: GrantFiled: April 13, 2000Date of Patent: May 21, 2002Assignee: Oskar Frech GmbH + Co.Inventors: Roland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard
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Patent number: 6321826Abstract: 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: GrantFiled: April 13, 2000Date of Patent: November 27, 2001Assignee: Oskar Frech GmbH + Co.Inventors: Roland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard
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Patent number: 5911924Abstract: 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: GrantFiled: November 27, 1996Date of Patent: June 15, 1999Assignee: ProControl AGInventors: Ronald Siegrist, Bruno Stillhard, Hugo Blochlinger
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Patent number: 5855829Abstract: 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: GrantFiled: December 18, 1995Date of Patent: January 5, 1999Assignee: ProControl AGInventors: Ronald Siegrist, Bruno Stillhard
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Patent number: 5792483Abstract: 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: GrantFiled: August 21, 1995Date of Patent: August 11, 1998Assignee: Vickers, Inc.Inventors: Ronald Siegrist, Bruno Stillhard, Hugo Blochlinger
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Patent number: 5348463Abstract: 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: GrantFiled: June 11, 1993Date of Patent: September 20, 1994Assignee: Klockner Ferromatik Desma GmbHInventors: Ralph Keitel, Bruno Stillhard
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Patent number: 5266874Abstract: 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: GrantFiled: November 1, 1990Date of Patent: November 30, 1993Assignee: Vickers, IncorporatedInventor: Bruno Stillhard
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Patent number: 4191726Abstract: 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: GrantFiled: March 17, 1978Date of Patent: March 4, 1980Assignee: Gebrueder Buehler AGInventors: Bruno Stillhard, Hans Naf
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Patent number: 4158540Abstract: 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: GrantFiled: June 24, 1977Date of Patent: June 19, 1979Assignee: Gebruder Buhler AGInventors: Bruno Stillhard, Hans Naf
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Patent number: 3954046Abstract: 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: GrantFiled: March 13, 1974Date of Patent: May 4, 1976Assignee: Gebrueder Buehler AGInventor: Bruno Stillhard