Actuator

Details Actuator Actuator

1992-12-10

1995-02-28

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 23, 74 8915, H02H 504

Patent

active

053942884

ABSTRACT:
An actuator in which an output shaft can be made to stop by a simple structure and in which actuator assured restart of the output shaft can be performed. The actuator comprises a motor, an output shaft provided with an external threading, and a connecting member having an internal threading engaged with the external threading of the output shaft. The actuator further comprises a resilient member for applying a predetermined load to the output shaft when the output shaft reaches the end of its moving range. The connecting member may comprise an internal screw member having a first protrusion formed on an outer surface thereof and a gear member having a second protrusion. When the second protrusion impacts with the first protrusion, a large starting torque is obtained. Further, two PTC thermistors are provided in a protection circuit, each thermistor allows flow of a current in only one direction, so as to prevent a reduction of a starting current.

REFERENCES:
patent: 3161074 (1964-12-01), Korthaus et al.
patent: 3269199 (1966-08-01), Deehan et al.
patent: 4716486 (1987-12-01), Sobiepanek et al.

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