Patents by Inventor Stanley A. Christopher

Stanley A. Christopher 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 device for telescopic props
    Patent number: 3991964
    Abstract: A telescopic prop of the kind used for supporting formwork and scaffolding in building construction has a self-locking device which enables the prop to be locked at any desired extension without the use of the customary locking pins. The self-locking is effected through the action of a number of balls housed in an annular channel of downwardly tapering width, the balls jamming against the surface of the inner extension member of the prop, which may be a length of standard scaffolding tube.
    Type: Grant
    Filed: December 10, 1974
    Date of Patent: November 16, 1976
    Assignee: Evan John and Sons (Kenfig Hill) Limited
    Inventor: Stanley A. Christopher