Patents by Inventor Mauno K. Koivusalo

Mauno K. Koivusalo 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: 4190925
    Abstract: A door-closer and hinge combination includes a pair of hinge plates adapted respectively to be fixed to a door and door frame, these plates respectively carrying a pair of extensions which are situated along a predetermined hinge axis and which are formed with coaxial bores, the axis of which coincides with the hinge axis, these bores receiving a hinge pin for hingedly connecting the hinge plates to each other. An elongated force-transmittingrod extends parallel to the hinge axis and is guided by a pair of guide sleeves carried by one of the hinge plates for movement parallel to the hinge axis. The force-transmitting rod carries a helical cam-follower which cooperates with a cam slot formed in the other hinge plate, which does not carry the guide sleeves, this other hinge plate preferably being fixed to a door so that upon opening the door the rod is vertically displaced.
    Type: Grant
    Filed: April 4, 1978
    Date of Patent: March 4, 1980
    Inventor: Mauno K. Koivusalo