Patents by Inventor Dieter Pretzel

Dieter Pretzel 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: 4667793
    Abstract: A friction clutch wherein the prongs of the diaphragm spring are formed with half spoon-shaped vanes each of which is adjacent to one edge face of the respective prong and serves to circulate air when the spring rotates. Each prong is further formed with a reinforcing rib which extends radially outwardly from the respective vane and into the ring-shaped main section of the spring. The ribs stiffen the prongs and prevent them from bending during actuation of the clutch, namely while the tips of the prongs are pushed or pulled in a direction to relax the bias of the spring upon the pressure plate of the clutch.
    Type: Grant
    Filed: February 13, 1986
    Date of Patent: May 26, 1987
    Assignee: Luk Lamellen und Kupplungsbau GmbH
    Inventors: Martin Kunz, Dieter Pretzel
  • Patent number: 4368811
    Abstract: In a friction clutch having a housing and levers mounted on the housing for actuating at least one pressure plate, the levers engaging the pressure plate through a connecting linkage, the levers being formed of at least two sheet metal members and at least two connecting members firmly linking the sheetmetal members to one another, the levers being disposed radially to the housing and carrying, in vicinity of the inner radial end thereof and between the sheetmetal members thereat, a run-up member responsive to the action of an actuating member for actuating the pressure plate.
    Type: Grant
    Filed: December 1, 1980
    Date of Patent: January 18, 1983
    Assignee: Luk Lamellen und Kupplungsbau GmbH
    Inventors: Oswald Dubiel, Dieter Pretzel
  • Patent number: 4368810
    Abstract: A wet friction clutch for automotive vehicles wherein the clutch plate between the flywheel and the pressure plate is assembled of two spaced-apart friction discs and a spacer disc therebetween. The friction discs are coupled to each other by leaf springs which prevent relative angular but allow relative axial movements of the two friction discs. Additional leaf springs connect the spacer disc and the pressure plate to the cover, and elastic lamellae are used to couple the two friction discs to the flywheel and the pressure plate, respectively. The clutch plate drives the input shaft of the transmission and carries a distributor for lubricating coolant which is supplied by a tubular guide for the disengaging unit and serves to cool the friction discs.
    Type: Grant
    Filed: August 6, 1980
    Date of Patent: January 18, 1983
    Assignee: Luk Lamellen und Kupplungsbau GmbH
    Inventors: Paul Maucher, Karl Keck, Dieter Pretzel
  • Patent number: 4256210
    Abstract: In a friction clutch having a housing and levers mounted on the housing for actuating at least one pressure plate, the levers engaging the pressure plate through a connecting linkage, the levers being formed of at least two sheet metal members and at least two connecting members firmly linking the sheetmetal members to one another, the levers being disposed radially to the housing and carrying, in vicinity of the inner radial end thereof and between the sheetmetal members thereat, a run-up member responsive to the action of an actuating member for actuating the pressure plate.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: March 17, 1981
    Assignee: Luk Lamellen und Kupplungsbau GmbH
    Inventors: Oswald Dubiel, Dieter Pretzel
  • Patent number: 4162002
    Abstract: In a friction clutch having a housing and levers mounted on the housing for actuating at least one pressure plate, the levers engaging the pressure plate through a connecting linkage, the levers being formed of at least two sheet metal members and at least two connecting members firmly linking the sheetmetal members to one another, the levers being disposed radially to the housing and carrying, in vicinity of the inner radial end thereof and between the sheetmetal members thereat, a run-up member responsive to the action of an actuating member for actuating the pressure plate.
    Type: Grant
    Filed: September 27, 1977
    Date of Patent: July 24, 1979
    Assignee: LuK Lammen und Kupplungsbau GmbH
    Inventors: Oswald Dubiel, Dieter Pretzel