Retainer Utilizes Or Abuts Plural Plates Patents (Class 403/168)
  • Supporting bolt
    Patent number: 4373309
    Abstract: A supporting bolt structure for connecting the ends of steps of a fabricated stairway including an elongated middle part having both internal and external threads at the ends thereof, a pair of internally threaded retainers mating with the external threads on the middle part and a pair of externally threaded headed portions mating with the internal threads of the middle part.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: February 15, 1983
    Assignee: Gelu Reutlinger Steinwerk Gerhard Lutz GmbH
    Inventor: Gerhard Lutz
  • Device for joining two structural parts
    Patent number: 4098555
    Abstract: A device for joining the frames of structural units which are structural units having undercut grooves. The device is provided engages itself in these grooves, and is preferably in the form of a spindle consisting of two parts which rotate with respect to each other on a common threaded shaft or axis. By rotating the defice each of the two parts anchors itself firmly into the undercut grooves in the frames which may be metal sections thus holding the frames together.
    Type: Grant
    Filed: March 2, 1976
    Date of Patent: July 4, 1978
    Assignee: Swiss Aluminium Ltd.
    Inventor: Karl Vollenweider