Automatic stop device with sliding yoke for electric motor
AssigneeSomfy SAS
InventorsKazuo Itoh, Kazuo Saegusa, Hiroshi Uchida
Life of this patent
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Abstract
The device comprises at least one lead screw (2) driving a sliding yoke (23) whose guide bar (22) is mounted on a rocker arm (19). The lead screw actuates a switch (27) by means of a cam (28) via the sliding yoke. A deliberate action on the rocker arm moves away the sliding yoke (23) which is brought instantaneously into initial position by a spring (25). The lead screw (2) is for preference disengageable by means of an arm (29) driven by the axle of the sliding yoke. This arm provides an angular positioning of the lead screw by acting on a heart-shaped cam (10). The device permits rapid, sure and precise setting of the stopping points of a motor.
Claims8
An automatic stop device for an electric motor after a certain number of revolutions, comprising a shaft (2) driven in rotation by the motor and exhibiting on the circumference of the shaft a helical profile linearly driving a sliding yoke (23) mounted so as to slide on a guide bar (22) parallel to an axle of the said shaft and actuating a switch (27) at a defined point in travel of the sliding yoke over said helical profile, wherein the said shaft is constituted by a lead screw (2), and wherein the sliding yoke (23) comprises a part which is shaped in profile (24) engaged into the lead screw, and wherein the guide bar (22) of the sliding yoke is mounted on a rocker arm (19) making it possible to move the sliding yoke away from the lead screw and comprises a spring (25) acting axially on the sliding yoke so as to instantaneously bring the sliding yoke into the position in which it actuates the said switch during movement of the sliding yoke away from the lead screw.
Dependencies are inferred from the claim text.