Patents by Inventor Karl Mangel

Karl Mangel 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).

  • Master operator for vertically moving elevator car doors
    Patent number: 4108283
    Abstract: A master door operator employs gate mounted driving clutch members which are locked in the clutching position by linkage arms, and a plurality of driven clutches are respectively mounted on the landing doors and each includes a rotatable cam carrying a pair of clutch rollers.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: August 22, 1978
    Inventor: Karl Mangel
  • Optical control system for elevators
    Patent number: 4034275
    Abstract: A reduction in speed of a movable member is sensed by an R. C. time delay circuit including light activated silicon controlled rectifiers which are respectively activated by light beams sequentially applied thereto at the rate of movement of said movable member.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: July 5, 1977
    Inventor: Karl Mangel
  • Master door operator for vertically movable elevator gates and landing doors
    Patent number: 4015688
    Abstract: A drive motor on an elevator car is connected by a pivotally driven arm to a clutch mechanism on the front of a vertically movable gate which upon operation of the drive motor engages a clutch mechanism on one of the landing doors to lift the gate and landing door in synchronism.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: April 5, 1977
    Inventor: Karl Mangel