Patents by Inventor Rolf Lehmann

Rolf Lehmann 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: 12638326
    Abstract: A gravimetric metering unit includes a metering device including a container for bulk material to be metered and a base unit with a horizontally arranged conveyor for the bulk material. The container and the base unit can be separated from each other for maintenance purposes. The metering unit also comprises a frame that is equipped with at least one scale on which the metering device is supported during operation via a mounting such that the metering unit is designed for a gravimetric metering process. The mounting is connected to the container of the metering device and supports the metering device via the container. The container is provided with a rail which protrudes away from the container, and the base unit has a supporting structure which runs on the rail such that the supporting structure can be moved back and forth between an operating position and a maintenance position.
    Type: Grant
    Filed: September 14, 2022
    Date of Patent: May 26, 2026
    Assignee: K-TRON TECHNOLOGIES INC.
    Inventors: Men Bernegger, Rolf Lehmann, Urs Helfenstein
  • Publication number: 20250326569
    Abstract: The disclosure relates to a method for metering bulk material by means of a metering device which has a conveyor container for bulk material to be metered and an elongated conveyor, which extends through the conveyor container, for the bulk material, which the conveyor transports out of the conveyor container to a dispensing line, wherein the bulk material located in the conveyor container is stirred by a stirring mechanism during the metering process and thus continuously forming bridges of bulk material are again removed, wherein the area at least lateral to the conveyor in the conveyor container is stirred, or the active area of the stirring mechanism of a metering device covers an area in the conveyor container lateral to the conveyor.
    Type: Application
    Filed: November 23, 2022
    Publication date: October 23, 2025
    Applicant: K-TRON TECHNOLOGIES, INC.
    Inventors: Men BERNEGGER, Rolf LEHMANN
  • Publication number: 20250198828
    Abstract: A gravimetric metering unit for bulk material has a metering means having a container for bulk material to be metered and a base unit. The base unit has a conveyor channel that feeds into an outlet line of the metering unit via a connection device having a flexible sealing element. Via the connection device, the conveyor channel can be operationally connected to the outlet line and detached again from same. The connection device has a magnetic securing arrangement for the operational connection of the sealing element at least to either the outlet line or the conveyor channel or to both.
    Type: Application
    Filed: November 14, 2022
    Publication date: June 19, 2025
    Applicant: K-TRON TECHNOLOGIES, INC.
    Inventors: Men BERNEGGER, Rolf LEHMANN, Urs HELFENSTEIN
  • Publication number: 20250083891
    Abstract: A gravimetric metering unit for bulk material includes a metering device, which has a container for bulk material to be metered and a base unit. The base unit has a screw conveyor, which is operably held in position and driven by means of a holder. The screw conveyor and the holder can be axially plugged together and are designed such that they can be operably fastened to each other by means of a plug-in connection. The plug-in connection is a magnetic connection.
    Type: Application
    Filed: November 14, 2022
    Publication date: March 13, 2025
    Applicant: K-TRON TECHNOLOGIES, INC.
    Inventors: Men BERNEGGER, Rolf LEHMANN, Urs HELFENSTEIN
  • Publication number: 20250035479
    Abstract: A gravimetric metering unit includes a metering device including a container for bulk material to be metered and a base unit with a horizontally arranged conveyor for the bulk material. The container and the base unit can be separated from each other for maintenance purposes. The metering unit also comprises a frame that is equipped with at least one scale on which the metering device is supported during operation via a mounting such that the metering unit is designed for a gravimetric metering process. The mounting is connected to the container of the metering device and supports the metering device via the container. The container is provided with a rail which protrudes away from the container, and the base unit has a supporting structure which runs on the rail such that the supporting structure can be moved back and forth between an operating position and a maintenance position.
    Type: Application
    Filed: September 14, 2022
    Publication date: January 30, 2025
    Applicant: K-TRON TECHNOLOGIES INC.
    Inventors: Men BERNEGGER, Rolf LEHMANN, Urs HELFENSTEIN
  • Patent number: 8397954
    Abstract: A device for metering bulk material includes a drive unit as well as a metering unit encompassing a metering module, a receptacle, and a stirring apparatus. A gear can be provided between the metering module and a wheel. The metering module is provided with an outlet. A quick coupling element is disposed on an axis in order for the metering unit to be designed as a replaceable unit. The metering unit can be swiveled about the axis when the quick coupling element is engaged such that the wheel can be non-positively contacted with driving means. A plate is used as a cover.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: March 19, 2013
    Assignee: K-Tron Technologies, Inc.
    Inventor: Rolf Lehmann
  • Patent number: 7434575
    Abstract: The invention relates to a chainsaw chain, especially for use in cutting concrete, comprising a plurality of teeth which are respectively provided with at least one cutting segment carrier and at least one cutting segment. The cutting segment comprises diamond punches which are melted into a binding material in such a way that they are embedded therein.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: October 14, 2008
    Assignee: Dolmar GmbH
    Inventor: Rolf Lehmann
  • Publication number: 20080000466
    Abstract: The invention relates to a chainsaw chain, especially for use in cutting concrete, comprising a plurality of teeth which are respectively provided with at least one cutting segment carrier and at least one cutting segment. The cutting segment comprises diamond punches which are melted into a binding material in such a way that they are embedded therein.
    Type: Application
    Filed: February 25, 2005
    Publication date: January 3, 2008
    Inventor: Rolf Lehmann
  • Publication number: 20070199132
    Abstract: A comforter is removably attached to fasteners on headwear. The comforter includes a multi-layered cushion having a first side and a second side, an outer covering is attached to the multi-layered cushion, and markers are attached to a first side of the outer covering and the liner.
    Type: Application
    Filed: February 28, 2006
    Publication date: August 30, 2007
    Inventor: Rolf Lehmann
  • Publication number: 20070170209
    Abstract: Disclosed is a device for metering bulk material. Said device substantially comprises a drive unit as well as a metering unit encompassing a metering module, a receptacle, and a stirring apparatus. A gear can be provided between the metering module and a wheel. Said metering module is provided with an outlet. A quick coupling element is disposed on an axis in order for the metering unit to be designed as a replaceable unit. The metering unit can be swiveled about said axis when the quick coupling element is engaged such that the wheel can be non-positively contacted with driving means. A plate is used as a cover.
    Type: Application
    Filed: February 8, 2005
    Publication date: July 26, 2007
    Inventor: Rolf Lehmann
  • Publication number: 20040181859
    Abstract: A protective textile material consisting of several material layers is proposed to provide protective clothing that simultaneously satisfies varying requirements, wherein at least one material layer is a flame-resistant and/or flame-retardant material (10, 30), and at least one other material layer is a cut-resistant protective material (11, 31) and/or a bullet or bayonet-proof material. Corresponding cut-resistant protective pants (20) with leg sleeves (22) forming two pant legs, wherein each leg sleeve (22) can be opened at least in part by at least one locking means (26, 27), are characterized in that the leg sleeves (22) are joined with an upper section (21), in particular for protecting the chest area of an individual, so that safety pinafore overalls are created, and the pinafore overalls (20) consist of a protective textile material.
    Type: Application
    Filed: January 29, 2004
    Publication date: September 23, 2004
    Inventor: Rolf Lehmann
  • Publication number: 20040152382
    Abstract: In order to provide a textile protective material made of multiple material layers which meets different requirements simultaneously, it is suggested that at least one material layer be a flame-resistant and/or flame-repellent material and at least one further material layer be a cut protection material, and/or a bulletproof or stabproof material.
    Type: Application
    Filed: January 12, 2004
    Publication date: August 5, 2004
    Inventor: Rolf Lehmann
  • Publication number: 20040148680
    Abstract: In order to create a glove with a sleeve (21) designed to protect the wrist and/or lower arm area, it is proposed that the sleeve (21) form a first protective surface (22) for protecting the lower arm and/or wrist.
    Type: Application
    Filed: January 14, 2004
    Publication date: August 5, 2004
    Inventor: Rolf Lehmann
  • Patent number: 6539635
    Abstract: To limit the penetration of the outer end of a chain saw into a material being cut by the saw, the chain carrying rail of the saw has a number of uniformly sized holes located at different points along its length into any selected one of which holes a limiting means can be placed, with the limiting means including two rotatable wheels located on opposite sides of the rail.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: April 1, 2003
    Assignee: Dolmar GmbH
    Inventors: Rolf Lehmann, Björn Buller
  • Publication number: 20020026716
    Abstract: To limit the penetration of the outer end of a chain saw into a material being cut by the saw, the chain carrying rail of the saw has a number of uniformly sized holes located at different points along its length into any selected one of which holes a limiting means can be placed, with the limiting means including two rotatable wheels located on opposite sides of the rail.
    Type: Application
    Filed: July 19, 2001
    Publication date: March 7, 2002
    Inventors: Rolf Lehmann, Bjorn Buller
  • Patent number: 5527422
    Abstract: A machine for the manufacture of chipboards or fibreboards comprises a pressure drum (1) and an endless steel belt (2) which wraps the pressure drum (1) around part of its periphery and forms there a compacting line (P) in which is for a sufficiently long time compacted and cured, by the action of pressure and temperature, material which is brought into it and which comprises lignocellulose or cellulose, is reduced to chips or fibres and is provided with an adhesive curable by heat. The compacting pressure and the heating are produced by extensive pressure shoes (10, 13, 14, 15) comprising a hydrostatic bearing pocket (11) supplied with hot pressurised oil. The pressure drum (1) is provided with a non-rotatable carrier (19) and a jacket (20) which is rotatable about it and is supported by supporting elements (21) supplied with hot pressurised oil, so that the jacket (20) is simultaneously heated and adjustable pressure forces without bearing loading are produced, while a uniform smooth gap is obtained.
    Type: Grant
    Filed: May 26, 1994
    Date of Patent: June 18, 1996
    Assignee: Sulzer-Escher Wyss AG
    Inventors: Rolf Lehmann, Eugen Schnyder
  • Patent number: 5513566
    Abstract: In a rotary printing machine the printing cylinder (1) is supported on a flexible band (6) under tension, printing ink being introduced into the gap (8) between the band (6) and the printing cylinder. This facilitates the hydraulic mounting of the printing cylinder (1) while reducing the load on the cylinder shaft journal mounting (2) and prevents deformation of the cylinder, and also ensures even ink coverage of the printing cylinder surface.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: May 7, 1996
    Assignee: Sulzer-Escher Wyss AG
    Inventors: Rolf Lehmann, Eugen Schnyder
  • Patent number: 5431321
    Abstract: The press guide roll (15) or web guide roll (4) comprises a fiber-reinforced plastic roll tube (20; 6) and a wire layer (7) wound on the surface of the roll tube (20; 6) in order to form substantially peripherally directed grooves (17). On either side of the roll middle (M), complementary sections (7b, 7c) of the windings (7) are inclined slightly relative to the peripheral direction and thus form a wire layer which is mirror symmetrically disposed about the roll's middle plane (M). The web guide roll (4) therefore laterally guides and automatically centers the material web.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: July 11, 1995
    Assignee: Sulzer Escher Wyss GmbH
    Inventors: Christoph Link, Rolf Lehmann
  • Patent number: 5393290
    Abstract: A roll for the thermal treatment of a web of material (4) in which the web of material (4) is cooled to a defined predetermined temperature in a gap (5) between the roll (1) and a counter-roll (2) is formed as a deflection controlled roll with a rotationally fixed carrier (8) and a rotatable roll jacket (10) which is supported relative to the latter with support elements (11). The roll jacket consists of a plurality of concentric zones, an inner soft zone (16) and a thin outer zone (17) with good thermal conductivity, for example of metal. The roll surface (22) is for example cooled with cooling gas nozzles which are regulated by a temperature sensor (20) so that the roll temperature in the gap (5) adopts a defined temperature value. A roll of this kind is for example suitable for use in a calender for the smoothing of a paper web or also for the processing or manufacture of a plastic foil.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: February 28, 1995
    Assignee: Sulzer-Escher Wyss GmbH
    Inventors: Rolf Lehmann, Eugen Schnyder
  • Patent number: 5372068
    Abstract: In a rotary printing press with a printing cylinder and a counter roller, such as an impression cylinder, for example, and a print web guided between them, faultless print quality across the entire width is attained, even with an extremely wide print web and a correspondingly slim printing cylinder. The printing cylinder is provided with a fixed support and a jacket, which is rotatable around it, and is supported by a row of support elements with a printing pressure which is controlled individually or in groups. With this arrangement, a uniform printing pressure profile across the print web width and, simultaneously, a print gap which is generally uniform are attained. Deformations and displacements of the printing cylinder jacket cross-wise to the printing plane are avoided in that additional cross-bracing elements for exerting a restoring force on the printing cylinder jacket cross-wise to the printing plane are provided.
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: December 13, 1994
    Assignee: Sulzer-Escher Wyss AG
    Inventors: Rolf Lehmann, Eugen Schnyder