| 摘要 |
<p>The present invention relates to a device suitable for mechanisms comprising a speed reducer unit with a gear wheel geared with the motor, comprising a support plate for supporting the motor, which can rotate in both directions about a shaft integral with the speed reducer unit, and movement means for moving the support plate comprising an angular lever the resistance arm of which comprises a first end portion, provided with a bar articulated thereto and to a point of the support plate, and a side appendage defining a second end portion, this end portion being subjected to the action of elastic means tending to move the lever towards a stable position of gearing between the gear wheel and the shaft of the motor.
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