1983-11-03
1988-10-18
Smith, Leonard E.
Pumps
Processes
310 34, 318127, 417417, F04B 1704, H02K 3310
Patent
active
047783532
ABSTRACT:
An electromagnetic fluid pump having a magnet attached to a reciprocating piston and a hall effect switch detecting the magnetic field generated by the moving magnet. In a first position of the magnet, the magnetic field through the hall effect switch is in a first direction causing the hall effect switch to generate a signal having a first polarity. In a second position of the magnet the magnetic field through the hall effect switch is reversed, reversing the polarity of the signal generated by the hall effect switch. An electronic switch circuit responsive to the signal generated by the hall effect having the first polarity to energize the solenoid coil to retract the piston from the first position to the second position against the force of a spring and further responsive to the signal having a reversed polarity to deenergize the solenoid coil when the piston is in the second position.
REFERENCES:
patent: 3293516 (1966-12-01), Maier et al.
patent: 3364361 (1968-01-01), Burger
patent: 3515966 (1970-06-01), De Valroger et al.
patent: 4086518 (1978-04-01), Wilkinson
patent: 4107604 (1978-08-01), Bernier
patent: 4413950 (1983-11-01), Wiernicki
M. Oppenheimer, "I IC Form, Hall-Effect Devices Can Take on Many New Applications", Electronics, pp. 46-49, Aug. 2, 1971.
J. L. Di Filippo, "A Silicon Hall Effect Latching Switch", Conference Proc., 30th Electronic Components Conference (28-30 Apr. 1980), IEEE.
Facet Enterprises Inc.
Smith Leonard E.
VanOphem Remy J.
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