Patents by Inventor Hartmuth Lotha

Hartmuth Lotha 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: 12179292
    Abstract: A method of controlling a welding cap cooling water controller having a cooling water pipe which includes a test section with a welding cap between an inlet valve in the cooling water inlet and a return valve in the cooling water return, in a first step the pressure of the cooling water in the test section is increased to an overpressure which is above a supply pressure that prevails in the test section during the welding process with the inlet valve open and the return valve open, and subsequently a pressure drop measurement is performed at overpressure. Furthermore, a welding cap cooling water controller is provided which is adapted to carry out such a method.
    Type: Grant
    Filed: September 23, 2021
    Date of Patent: December 31, 2024
    Assignee: BUERKERT WERKE GMBH & CO. KG
    Inventor: Hartmuth Lotha
  • Publication number: 20220088726
    Abstract: A method of controlling a welding cap cooling water controller having a cooling water pipe which includes a test section with a welding cap between an inlet valve in the cooling water inlet and a return valve in the cooling water return, in a first step the pressure of the cooling water in the test section is increased to an overpressure which is above a supply pressure that prevails in the test section during the welding process with the inlet valve open and the return valve open, and subsequently a pressure drop measurement is performed at overpressure. Furthermore, a welding cap cooling water controller is provided which is adapted to carry out such a method.
    Type: Application
    Filed: September 23, 2021
    Publication date: March 24, 2022
    Inventor: Hartmuth LOTHA
  • Patent number: 10866037
    Abstract: A process valve manifold comprises an inlet for a heat transfer medium, a main outlet for the heat transfer medium, a main duct extending between the inlet and the main outlet, ports for secondary circuits, a 3/2-way valve which is arranged in the main duct, and a bypass outlet. The 3/2-way valve is switchable between different positions. The positions determine a flow cross-section by which the bypass outlet and the main outlet are in communication with the main duct. The manifold further comprises control valves for determining a flow cross-section between the main duct and the ports for the secondary circuits.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: December 15, 2020
    Inventor: Hartmuth Lotha
  • Publication number: 20170144245
    Abstract: A welding cap cooling water control system has a cooling water conduit with a cooling water inflow leading in direction of the welding cap and a cooling water return flow leading away from the welding cap, in which a flow sensor and a control valve are seated. On the side of the inflow or the return flow the cooling water flow is controlled by a flow control valve which also serves for emergency shut-off in the case of pressure loss.
    Type: Application
    Filed: November 23, 2016
    Publication date: May 25, 2017
    Inventors: Hartmuth LOTHA, Juergen STRAUB
  • Publication number: 20160238327
    Abstract: A process valve manifold comprises an inlet for a heat transfer medium, a main outlet for the heat transfer medium, a main duct extending between the inlet and the main outlet, ports for secondary circuits, a 3/2-way valve which is arranged in the main duct, and a bypass outlet. The 3/2-way valve is switchable between different positions. The positions determine a flow cross-section by which the bypass outlet and the main outlet are in communication with the main duct. The manifold further comprises control valves for determining a flow cross-section between the main duct and the ports for the secondary circuits.
    Type: Application
    Filed: February 1, 2016
    Publication date: August 18, 2016
    Inventor: Hartmuth LOTHA
  • Publication number: 20140216708
    Abstract: A cooling arrangement for cooling weld caps of a welding device includes a local cooling pipe having a feed portion through which coolant can flow to the weld caps, and a return portion through which coolant can flow away from the weld caps. The cooling arrangement has at least one sensor and at least one actuator arranged at the cooling pipe. A check device is connected to the sensor and the actuator. The check device is arranged in an immediate vicinity of the sensor and/or the actuator and/or the local cooling pipe, and is adapted to receive measured values of the sensor and to check, based on pre-established criteria, whether the measured values are within a predefined desired range. In response to a negative check result, the check device can drive the actuator in a predetermined manner such that the cooling arrangement is placed in a safe condition.
    Type: Application
    Filed: February 3, 2014
    Publication date: August 7, 2014
    Applicant: Buerkert Werke GmbH
    Inventors: Thomas Hamm, Hartmuth Lotha
  • Patent number: 7598472
    Abstract: A device for cooling welding caps of a welding apparatus includes a cooling line (10). A cooling agent is kept under pressure during removal of the welding caps. An expansion device (16) including an expansion chamber (34) is connected to the cooling line (10).
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: October 6, 2009
    Assignee: Burkert Werke GmbH & Co. KG
    Inventor: Hartmuth Lotha
  • Publication number: 20060175379
    Abstract: A device for cooling welding caps of a welding apparatus includes a cooling line (10). A cooling agent is kept under pressure during removal of the welding caps. An expansion device (16) including an expansion chamber (34) is connected to the cooling line (10).
    Type: Application
    Filed: January 27, 2006
    Publication date: August 10, 2006
    Applicant: Burkert Werke GmbH & Co. KG
    Inventor: Hartmuth Lotha