Flowswitch having O-ring pairs arranged in corresponding...

Details Flowswitch having O-ring pairs arranged in corresponding... Flowswitch having O-ring pairs arranged in corresponding...

2007-04-20

2010-11-09

Gushi, Ross N (Department: 2833)

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

Reexamination Certificate

active

07829806

ABSTRACT:
The present invention provides a flowswitch for installing in piping, featuring a flowswitch base having an inner cavity; a pivot rod being arranged for rotating in the flowswitch base, the pivot rod having a pair of O-ring grooves; a paddle arm being coupled to the pivot rod inside the cavity, for moving in response to fluid flowing in the piping and rotating the pivot arm; lubricating O-rings being installed onto the pivot rod with each O-ring arranged in a respective O-ring groove for providing a respective seal between fluid being sensed and the outside environment and acting as a bearing on which the pivot rod rotates when the paddle arm moves, the grooves acting to holding the O-rings in place on the pivot arm in response to pressurized fluid flowing in the piping; and an actuating arm being coupled between the pivot arm and the pivot rod for actuating a switch when the pivot arm rotates.

REFERENCES:
patent: 2203331 (1940-04-01), Hinsch
patent: 3065316 (1962-11-01), Olson
patent: 3188421 (1965-06-01), Rowell
patent: 3452169 (1969-06-01), Ruxton
patent: 3501605 (1970-03-01), Hutchinson et al.
patent: 4110575 (1978-08-01), Meisenheimer, Jr.
patent: 4926903 (1990-05-01), Kawai
patent: 4955785 (1990-09-01), Cohen
International Search Report dated Aug. 14, 2008 (3 pages).

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