Patents by Inventor Robert L. Wahlstedt

Robert L. Wahlstedt 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).

  • Electromagnetic spring clutch
    Patent number: 4263995
    Abstract: Spring clutch is actuated by magnetic field applied radially between non-rotatable source and rotative clutch hub and spring-contracting ring.
    Type: Grant
    Filed: March 3, 1978
    Date of Patent: April 28, 1981
    Assignee: Reell Precision Manufacturing Corporation
    Inventor: Robert L. Wahlstedt
  • Magnetic spring grip device
    Patent number: 3974902
    Abstract: An electromagnetically actuated clutch or the like having a helical spring disposed about the surface of a relatively rotatable drum, and an electromagnet with a fixed annular pole piece closely adjacent the free end coil of the spring. The spring is induced to grip the drum surface by the action of magnetic flux passing from the drum to the spring and thence directly to the polepiece.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: August 17, 1976
    Assignee: Reel Precision Maufacturing Corporation
    Inventors: Robert L. Wahlstedt, Robert F. Rasmussen, Lee W. Johnson