Spiral orifice dashpot timer

Details Spiral orifice dashpot timer Spiral orifice dashpot timer

1977-05-26

1978-08-29

Brown, David H.

Brakes

Wheel

Transversely movable

188266, 188322, 102277, G04F 1300

Patent

active

041094557

ABSTRACT:
The present invention relates to a fluid controlled timer comprising a cydrical 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.

REFERENCES:
patent: 2994271 (1961-08-01), Silver et al.
patent: 3171245 (1965-03-01), Breed
patent: 3553959 (1971-01-01), Young et al.
patent: 3563022 (1971-02-01), Breed
patent: 3712421 (1973-01-01), Hadfield
patent: 3998164 (1976-12-01), Hadfield

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