Title: Magnetic spring grip device

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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Wahlstedt, Robert L. (Roseville, MN, US)
Rasmussen, Robert F. (Minneapolis, MN, US)
Johnson, Lee W. (Lake Elmo, MN, US)

Application Number: 590401
Filing Date: 1975-06-26
Publication_date: 1976-08-17
Assignee: Reel Precision Maufacturing Corporation (St. Paul, MI)
Primary Class(es): 192/84.81 192/81C
Other Classes:
US Patent Ref:

3216392	Nov, 1965	Shimanckas	192/84.
3315773	Apr, 1967	Aschauer	192/84.
3349880	Oct, 1967	Baer	192/84.

Other Refs:
Primary Examiner: Herrmann, Allan D.
Assistant Examiner:
Attorney: