Patents Assigned to Ing. Johann Leinweber Anstalt fur Mechanik
  • Apparatus for making friction elements such as brakeshoes and clutch plates
    Patent number: 5030075
    Abstract: An apparatus for charging a press for making brakeshoes and the like utilizes an intermediate mold carrying precompacted powder positioned on the press mold. The powder is engaged by the raised press ram and a lowered ejection ram such that the powder trapped between the rams is transferred to the press mold. The intermediate mold is then removed, a counter-pressure plate swingably mounted on a frame of the apparatus is applied into registry with the press mold and the press operation ensues.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: July 9, 1991
    Assignee: Ing. Johann Leinweber Anstalt fur Mechanik
    Inventor: Johann Leinweber
  • Method for making friction elements such as brakeshoes and clutch plates
    Patent number: 4968468
    Abstract: A method for charging a press for making brakeshoes and the like utilizes an intermediate mold to carry the precompacted powder. The intermediate mold is positioned on the press mold and the powder engaged by the raised press ram and a lowered ejection ram so that the powder trapped between the rams is transferred to the press mold. The intermediate mold is then removed, a counterpressure plate is applied and the press operation ensues.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: November 6, 1990
    Assignee: Ing. Johann Leinweber Anstalt fur Mechanik
    Inventor: Johann Leinweber
  • Apparatus for pressing curved brake linings, especially for drum-type brakes
    Patent number: 4900240
    Abstract: A precompact of flowable brake-lining composition is formed in an intermediate die by pressing the material in a direction perpendicular to the generatrices of the curved surfaces between which the material is pressed, whereupon the intermediate die is swung onto the hot-pressing die and the precompact transferred between synchronously driven rams into the hot-pressing die. A horizontal ram effects the final hot pressing of the precompact, advantageously directly bonding the same to a brakeshoe.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: February 13, 1990
    Assignee: Ing. Johann Leinweber Anstalt fur Mechanik
    Inventor: Johann Leinweber