Patents by Inventor Earl L. Walls

Earl L. Walls 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).

  • Hand control system for power hand tools
    Patent number: 3959883
    Abstract: A hand control system for power hand tools comprises a manually operated control means for activating a low current electric signal and means for actuating an operation of the power tool. Circuit means are provided for sensing the low current electric signal when it is activated by the manually operated control means to provide a higher current operational signal to the tool actuating means. The manually operated control means may include various types of switch means. The finger-tip control means is located on a hand-piece unit of a power tool. The circuit means includes means for amplifying the low current electric signal and switching means for receiving an amplified current drive signal from the amplifying means and transmitting the higher current operational signal to the actuating means. A specific feature of this invention is the use of the manually operated control means in combination with a dental device having an air driven motor for tool members rotatably mounted in the hand-piece unit.
    Type: Grant
    Filed: July 23, 1973
    Date of Patent: June 1, 1976
    Inventors: Earl L. Walls, Verl O. Olson