Patents Assigned to Retsch GmbH
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Patent number: 11719605Abstract: The invention shows and describes a vibration mill for at least two grinding beakers performing vibrations in the horizontal position, with at least one multi-part pendulum drive, wherein the pendulum drive has at least one eccentric shaft mounted to rotate about a vertical eccentric axis, and at least two rockers each mounted so as to be capable of vibrating about a vertical vibration axis and connected by means of couplers to the eccentric shaft, said rockers holding the grinding beakers. The pendulum drive further has a motor unit coupled to the eccentric shaft as a drive for the eccentric shaft and optionally further components, wherein a rotary movement of the eccentric shaft via the couplers can be converted into a vibrating movement of the rockers. According to the invention, the centre of gravity of the pendulum drive in a horizontal centre of gravity plane is substantially equidistant from both vibration axes.Type: GrantFiled: May 7, 2019Date of Patent: August 8, 2023Assignee: Retsch GmbHInventors: Uwe Orth, Stefan Drechsler, Frank Janetta, Alexander Mühlig
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Publication number: 20230065817Abstract: A device module for a laboratory device is shown and described. The device module has at least one temperature control medium connection for connecting the device module, as required, to a temperature control medium supply of, in particular, a liquid or gaseous temperature control medium, at least one line connection for connecting, as required, to at least one supply line of the laboratory device for the temperature control medium, and at least one actuator of a control process and/or control loop for controlling and/or regulating at least one temperature in the laboratory device.Type: ApplicationFiled: February 3, 2021Publication date: March 2, 2023Applicant: Retsch GmbHInventors: Zilan Orhan, Uwe Orth
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Publication number: 20220347692Abstract: The invention illustrates and describes a laboratory vibratory mill with at least one milling beaker holder which is mounted so as to be capable of oscillating, for at least one milling beaker, and with a temperature control device for controlling the temperature of the milling beaker by feeding in and/or carrying away a liquid or gaseous temperature control medium via at least one temperature control line to the milling beaker holder. According to the invention there is provision that the milling beaker holder has at least one heat transfer element which is connected to the temperature control line, wherein the heat transfer element has at least one medium duct for feeding through the temperature control medium, and wherein the temperature control of a milling beaker which is secured to and/or in the milling beaker holder is carried out by transferring heat between the temperature control medium conducted in the medium duct and the milling beaker via a wall of the heat transfer element.Type: ApplicationFiled: September 3, 2020Publication date: November 3, 2022Applicant: Retsch GmbHInventor: Zilan Orhan
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Publication number: 20220113226Abstract: A laboratory mill is shown and described with at least one oscillatably mounted grinding bowl holder for at least one grinding bowl and with at least one line for transporting a liquid or gaseous medium, the line having at least one compensating element for compensating relative movements between the grinding bowl holder and/or the grinding bowl and a stationary part of the laboratory mill. In accordance with the invention, a rigid compensating element is provided for compensating relative movements, wherein the compensating element is elastically deformed at least in regions during an oscillating movement of the grinding bowl holder and wherein the compensation of relative movements is effected free of parts of the compensating element connected to one another so as to be movable, in particular rotatable and/or pivotable, relative to one another and only by elastic deformation of the compensating element.Type: ApplicationFiled: September 1, 2020Publication date: April 14, 2022Applicant: Retsch GmbHInventors: Uwe Orth, Zilan Orhan, Stefan Mähler, Alexander Mühlig
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Patent number: 10974252Abstract: A comminution device for laboratory operation is described. More specifically, a laboratory mill, particularly a centrifugal mill, is provided that includes a milling tool arranged in a milling chamber, a housing assembly, and a milling material channel running through the housing assembly. The milling material channel opens into the milling chamber and is configured to supply, for supplying milling material to the milling chamber or to discharge milled material from the milling chamber. The milling material channel may be open to the environment and/or can be opened for successively supplying milling material to the milling chamber during the milling operation. At least one system for passively reducing noise emissions is provided and situated in the region of the milling material channel.Type: GrantFiled: March 24, 2017Date of Patent: April 13, 2021Assignee: RETSCH GMBHInventors: Frank Janetta, Ralf Eisenbach, Alexander Hoehne
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Publication number: 20200333219Abstract: The invention shows and describes a vibration mill for at least two grinding beakers performing vibrations in the horizontal position, with at least one multi-part pendulum drive, wherein the pendulum drive has at least one eccentric shaft mounted to rotate about a vertical eccentric axis, and at least two rockers each mounted so as to be capable of vibrating about a vertical vibration axis and connected by means of couplers to the eccentric shaft, said rockers holding the grinding beakers. The pendulum drive further has a motor unit coupled to the eccentric shaft as a drive for the eccentric shaft and optionally further components, wherein a rotary movement of the eccentric shaft via the couplers can be converted into a vibrating movement of the rockers. According to the invention, the centre of gravity of the pendulum drive in a horizontal centre of gravity plane is substantially equidistant from both vibration axes.Type: ApplicationFiled: May 7, 2019Publication date: October 22, 2020Applicant: Retsch GmbHInventors: Uwe Orth, Stefan Drechsler, Frank Janetta, Alexander Mühlig
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Patent number: 10639644Abstract: The invention relates to a laboratory mill comprising at least one counter-vibration device (27) which has at least one control unit (29a) for providing a counter-vibration signal (29b) and at least one controllable vibration generation unit (29) for converting the counter-vibration signal (29b) into counter-vibrations (30), wherein the vibration-generation unit (29) counteracts a device- and/or housing part (31) of the laboratory mill (1) and the counter-vibrations (30) lead to an active reduction in the vibrations of the device- and/or housing part (31) and/or an at least partial suppression of noise-inducing vibrations of the device- and/or housing part (31), by means of destructive interference.Type: GrantFiled: April 3, 2017Date of Patent: May 5, 2020Assignee: Retsch GmbHInventor: Frank Janetta
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Patent number: 10058871Abstract: A ball mill is provided comprising at least two milling cup retainers arranged on a machine base plate, each milling cup retainer being designed for a milling cup clamped in the milling cup retainer in a lying position, each milling cup having end-face milling cup ends and a filling of balls as milling bodies and comprising a drive that causes an out-of-phase rotational motion between the milling cup retainers.Type: GrantFiled: June 14, 2013Date of Patent: August 28, 2018Assignee: RETSCH GMBHInventors: Jürgen Pankratz, Stefan Mähler, Matthias Niewind, Frank Janetta
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Patent number: 8720806Abstract: A laboratory grinding mill having at least one grinding bowl configured to carry out a rotary movement about its central axis, and designed for conveying a liquid or gaseous medium therethrough. A rotary lead-through device having a stationary part and a movable part is coupled to the movement of the grinding bowl. The stationary part is provided with at least one connection for a stationary conduit, and the movable part is provided with at least one connection with a conduit that leads to the grinding bowl.Type: GrantFiled: January 26, 2010Date of Patent: May 13, 2014Assignee: Retsch GmbHInventor: Stefan Reinhold Mahler
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Patent number: 8042754Abstract: A laboratory vibration grinding mill comprising a circular oscillating drive that operates in at least two dimensions, at least one support, and a respective elongated grinding bowl held in each support. The grinding bowl has a filling of grinding bodies and is provided with frontal grinding bowl bases. The support for a grinding bowl is configured such that a longitudinal axis of the grinding bowl forms an angle of less than 90° with a plane of movement of the circular oscillating drive such that due to movement paths of the grinding bodies in the grinding bowl caused by the inclined position of the grinding bowl relative to the plane of movement of the circular oscillating drive, the frontal grinding bowl bases are incorporated into a size-reduction process as abutment and grinding surfaces.Type: GrantFiled: July 12, 2008Date of Patent: October 25, 2011Assignee: Retsch GmbHInventors: Stefan Mähler, Jürgen Pankratz
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Publication number: 20100181402Abstract: A laboratory vibration grinding mill comprising a circular oscillating drive that operates in at least two dimensions, at least one support, and a respective elongated grinding bowl held in each support. The grinding bowl has a filling of grinding bodies and is provided with frontal grinding bowl bases. The support for a grinding bowl is configured such that a longitudinal axis of the grinding bowl forms an angle of less than 90° with a plane of movement of the circular oscillating drive such that due to movement paths of the grinding bodies in the grinding bowl caused by the inclined position of the grinding bowl relative to the plane of movement of the circular oscillating drive, the frontal grinding bowl bases are incorporated into a size-reduction process as abutment and grinding surfaces.Type: ApplicationFiled: July 12, 2008Publication date: July 22, 2010Applicant: Retsch GmbHInventors: Stefan Mähler, Jürgen Pankratz
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Publication number: 20050006506Abstract: A laboratory appliance having a working apparatus that is driven by a drive and that during operation produces an imbalance is provided. The appliance includes at least one sliding device that permits movements only in a horizontal plane that extends parallel to the surface on which the laboratory appliance stands. The sliding device is disposed between the drive of the working apparatus, and the surface on which the laboratory appliance stands.Type: ApplicationFiled: July 9, 2004Publication date: January 13, 2005Applicant: Retsch GmbH & Co. KGInventors: Kenneth McCartney, Hans-Jurgen Meyer
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Patent number: 6061130Abstract: An apparatus for determining the particle size distribution and for characterizing the particle shapes of a particle mixture has a metering device for classifying a particle mixture supplied in a particle stream to the apparatus. An optoelectronic measurement section is provided that has a light source and an image collecting device aligned with one another, wherein the particle stream is guided between the light source and the image collecting device. The image collecting device has a plurality of electrooptical image recording units directed onto the particle stream and having different image recording scales matched to one another to cover the whole measurement range of the apparatus. A computing unit converts digital image points recorded by the recording units into a size determination of the particles.Type: GrantFiled: January 22, 1999Date of Patent: May 9, 2000Assignee: F. Kurt Retsch GmbH & Co. KGInventors: Martin Plate, Jurgen Pankratz
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Patent number: 5791494Abstract: In a screening machine with a three-dimensional oscillating screening movement and a control unit for converting a given vibration level into the required energy supply for the electromagnet, the results of screening analyses are to be reproducible or comparable; to this end it is provided that the control unit (26) is designed for calculating the machine acceleration as a function of the respective determined vibration level and the simultaneously determined frequency value as a control value for the energy supply to the electromagnet and for the setpoint-actual value comparison of the calculated machine acceleration actual value with a given machine acceleration setpoint value and for compensating a determined machine acceleration deviation by adjusting the energy supply to the electromagnet (21) on the basis of the change in the vibration level calculated as a function of the given frequency.Type: GrantFiled: June 28, 1996Date of Patent: August 11, 1998Assignee: F. Kurt Retsch GmbH & Co. KGInventor: Hans Jurgen Meyer
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Patent number: 5662282Abstract: A centrifugal mill exchangeable cassette for laboratory use has a base body a drive motor, including a drive shaft, connected to the base body. A housing with cover enclosing the base body and the drive motor is provided. The housing has a milling chamber. The cover has an inlet opening for feeding materials to be milled to the milling chamber. A rotor is connected to the drive shaft of the drive motor. The rotor is positioned in the milling chamber. An exchangeable cassette with an annular receptacle and with a radially inner wall consisting of an annular sieve and connected to the annular receptacle is provided. The exchangeable cassette is positioned in the housing so as to surround the milling chamber and the rotor for catching the material milled by the rotor in the milling chamber. The exchangeable cassette has a detachable lid covering the milling chamber and the rotor.Type: GrantFiled: February 20, 1996Date of Patent: September 2, 1997Assignee: F. Kurt Retsch GmbH & Co. KGInventor: Hans-Jurgen Meyer
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Patent number: 5261540Abstract: In a screening machine with a three-dimensional screening motion, a screen carrier for at least one screen plate is provided. The screen carrier is movable relative to a housing from which it is supported by springs. The screen carrier is driven by an electromagnetic drive device. The amplitude of oscillation of the screen carrier should be accurately readable, on the one hand, and, on the other hand, made adjustable for comparative tests. For this purpose, between the housing and the screen carrier an inductive displacement pickup for determining the amplitude of oscillation of the screen carrier is provided. This pickup is connected to a control unit which represents the determined amplitude of oscillation on an optical display and/or controls the electromagnet drive device to obtain a predetermined amplitude of oscillation.Type: GrantFiled: April 23, 1991Date of Patent: November 16, 1993Assignee: F. Kurt Retsch GmbH & Co. KGInventor: Peter Sijsling
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Patent number: 4688727Abstract: An apparatus for fine grinding of, in particular, material samples for laboratory experiments. The apparatus has a fixed grinding member and a rotating grinding member, which are disposed in such a way that each has a surface facing the other and slightly spaced therefrom, with the material which is to be ground being received and passed between these surfaces. The problem faced by such an apparatus is that samples have to be introduced and discharged one by one, so that the work is carried out as a batch process. It is also difficult to accurately adjust the grinding degree. In order to solve these problems, and to carry out a continuous grinding of hard and very hard materials, as well as to be able to adjust the grain size of the grinding, the invention proposal is that the grinding members on the one hand be a fixed cylindrical body and on the other hand be a roller body which rotates coaxially therein.Type: GrantFiled: November 2, 1984Date of Patent: August 25, 1987Assignee: F. Kurt Retsch GmbH & Co. KGInventor: Dirk Sijsling
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Patent number: D420864Type: GrantFiled: October 9, 1998Date of Patent: February 22, 2000Assignee: F. Kurt Retsch GmbH & Co. KGInventors: Alan Kenney, Kenneth Oliver McCartney