Patents by Inventor Mark J. Kramer

Mark J. Kramer 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).

  • Self-locking brake for portable stand
    Patent number: 5431254
    Abstract: A brake for a portable stand includes a bracket for attaching the brake to the stand, a sleeve attached to one edge of the bracket, and a plunger movable within the sleeve. A toggle joint, connected between the bracket and one end of the plunger, has a pivot plate as one arm of the toggle joint and a handle attached to the pivot plate for extending and retracting the plunger. A foot attached to the free end of the plunger is either a friction pad or a caster and is attached to the plunger by a leveling screw. The edge of the bracket includes a recess for receiving the toggle joint in an over-center position.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: July 11, 1995
    Inventors: Bernard L. Kramer, Theodore B. Kramer, Mark J. Kramer