Patents Assigned to Keystone Friction Hinge Co.
  • Patent number: 7275283
    Abstract: The present invention is a hinge assembly for engaging an appliance door to an appliance, such that rotational forces generated by the door as a function of the door position are balanced against a rotation force exerted about an axis of rotation for the door. The hinge assembly may be engaged to an interface using a locking bar to prevent translation of the adapter plate relative to the interface. The hinge assembly may further have a plunger incorporating an ovoid shaped retention pin bore for retaining an elastic element to the plunger.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: October 2, 2007
    Assignee: Keystone Friction Hinge Co.
    Inventors: Adam Kistner, James Alexander Witter
  • Patent number: 5341542
    Abstract: An anti-tip hinge device for a door or a shelf, which is pivotally moved to obtain a horizontal cantilever position. The hinge device has a channel which fits into a sheath of and is connected to the door or shelf. A lever arm carries cam followers which engage a cam in the channel. The cam is supported in the channel by a pin and a spring located on opposite ends of the cam. The cam has a recess and a ramp disposed adjacent to the recess. When an overload is applied to the cantilever end of the door or shelf, the cam followers are disengaged from the recess of the cam, and push the cam inwardly within the channel at an angle to allow the door or shelf to be titled downwardly below the horizontal. This action interrupts the counterbalance spring effect on the door. A pin-hole arrangement resets the hinge device, and a lug-slot arrangement prevents the door from disengaging the hinge device.
    Type: Grant
    Filed: October 5, 1992
    Date of Patent: August 30, 1994
    Assignee: Keystone Friction Hinge Co.
    Inventors: Edward J. Hannan, George H. Schneider