Spiral Orifice Dashpot Timer.
DEPARTMENT OF THE ARMY WASHINGTON D C
Pagination or Media Count:
The present invention relates to a fluid controlled timer comprising a cylindrical housing, and a close-fitting rotary shaft positioned co-axially within the housing. A spiral passageway scribed between the housing and the rotary shaft extends between the ends of the housing. The spiral passageway contains a viscous liquid and a sphere slidably disposed therein and capable of traversing the entire passageway length. An external constant torque spring connected to one end of the rotary shaft causes the rotary shaft movement while resistance to such movement results from interference of the sphere during its traverse through the spiral passageway, thus providing an extended time delay. Author
- Fluidics and Fluerics