| 摘要 |
PROBLEM TO BE SOLVED: To provide an arm connecting structure which prevents a hanging-down under the gravity or external force in the direction orthogonal to the rotational direction when rotatably supporting a pair of arm members. SOLUTION: The second arm 22 is fixed to a shaft 30 and the first arm 21 is rotatably connected to the shaft 30. The first arm 21 is provided with a contact 41 always in contact with the shaft 30 by its own weight of the first arm 21, and the first arm 21 is prevented from hanging down under the gravity and external force. An adjustment means 42 is provided for adjusting the position where the contact 41 contacts with the shaft 30 to allow adjustment of an angle of the first arm 21 in the vertical direction, so that the accuracy in setting the first arm 21 horizontally is not required, facilitating its design and manufacturing. The shaft 30 and the first arm 21 are connected at a rotation part without using a screw or the like, causing the fastened part not be loosened through the rotation. The structure of the shaft 30 is simple and the number of parts can be reduced. COPYRIGHT: (C)2011,JPO&INPIT
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