| 摘要 |
PROBLEM TO BE SOLVED: To provide a door opener, by which a door open-close unit is miniaturized and lightened and a door can be opened efficiently by only one of the operation of a touch switch and which is silent. SOLUTION: In the door opener 1 opening the rotary type door in which one end section is supported rotatably by a hinge, the door opener 1 has a motor 2 housed in a bottomed cylindrical housing 3, a screw shaft 4, to which the rotation of the motor 2 is transmitted, a nut 5 screwed to the screw shaft 4 and internally inserted into the housing 3, the first spring 6 housed between the nut 5 and the shoulder section 3a of the housing 3 and the second spring 7 housed between the bottom section 3b of the housing 3 and the motor 2, and the rotation of the motor 2 is converted into the linear motion of the nut 5. The nut 5 is formed to the housing 3 retractively and irrotationally and the screw shaft 4 is formed integrally with an output shaft for the motor 2.
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