Machine element or mechanism – Alternate manual or power operators
Patent
1993-11-29
1996-04-02
Marmor, Charles A.
Machine element or mechanism
Alternate manual or power operators
192141, 192150, 251 80, 25112903, 2512495, 251291, 475 4, F16H 132, F16K 3105, F16K 3700
Patent
active
055030459
ABSTRACT:
A drive assembly for a valve includes a motor, a transmission which is coupled to the motor and the valve, and a manual drive unit having a shaft which is arranged to be driven by a handwheel. The shaft has a small amount of axial play and is provided with a worm. The transmission includes a hollow gear having internal teeth coupled to the motor shaft and external teeth in permanent mesh with the worm. A membranous disc is mounted on the worm shaft in such a manner that the outer margin of the disc is held against displacement in axial direction of the worm shaft while the central portion of the disc adjacent the worm shaft is fixed against axial displacement relative to the worm shaft. However, the worm shaft can rotate relative to the disc. Strain gages in the form of strips are mounted on one side of the disc and are connected to an integrated circuit on the same side of the disc. During manual operation, the worm causes the worm gear to rotate so that the torque produced by the handwheel is transmitted to the motor shaft. On the other hand, when the motor runs, the worm is stationary and holds the worm gear against rotation. If the load on the motor increases, the worm gear is urged into firmer engagement with the worm because the increased load is transmitted to the worm via the motor shaft. This causes axial shifting of the worm shaft with an accompanying deformation of the disc. The deformation of the disc is sensed by the strain gages which generate signals repesentative of the increase in load.
REFERENCES:
patent: 2452178 (1948-10-01), Brownlee
patent: 3915015 (1975-10-01), Crane
patent: 4111070 (1978-09-01), Stratienko
patent: 4474078 (1984-10-01), Denkowski et al.
patent: 4616528 (1986-10-01), Malinski
patent: 4738438 (1988-04-01), Horie et al.
patent: 4760989 (1988-08-01), Elliot
patent: 5059879 (1991-10-01), Watanabe
Grabow Troy
Marmor Charles A.
Werner Riester GmbH & Co. KG Armaturen- und Maschinenantriebe
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