Motors: spring – weight – or animal powered – Spring – With winding means
Patent
1975-10-23
1978-05-23
Herrmann, Allan D.
Motors: spring, weight, or animal powered
Spring
With winding means
74 2, 92 136, 92136, 92143, 188304, 188317, 251 54, 251 69, 251 71, F16D 1302, G05G 1700, F03G 100
Patent
active
040905896
ABSTRACT:
A valve actuator employs a torsion spring type clutch to engage and disengage a drive motor and an output shaft. The torsion spring normally engages and is connected to a gear which may be engaged by a dog to cause disengagement of the clutch. The output shaft carries a pinion which is engaged with a rack carried on a piston which is slidable in a closed fluid containing cylinder. The piston includes an axial passageway with a metering orifice therein which smoothes the operation of the actuator and provides positive stops for the output shaft with a minimization of impact between the piston and the ends of the cylinder.
REFERENCES:
patent: 238551 (1881-03-01), Barlow
patent: 718037 (1903-01-01), Toennes
patent: 1493884 (1924-05-01), Kreider
patent: 1944689 (1934-01-01), Heverly
patent: 2015758 (1935-10-01), Moulton
patent: 2723013 (1955-11-01), Rogers et al.
patent: 2883022 (1959-04-01), Clausing et al.
patent: 3028726 (1962-04-01), Jenkins et al.
patent: 3104745 (1963-09-01), Wipke
patent: 3156160 (1964-11-01), Meyer et al.
patent: 3225875 (1965-12-01), Thomas et al.
patent: 3808895 (1974-05-01), Fitzwater
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