| 摘要 |
PURPOSE:To ensure positioning of a lever in an axial direction by providing a projecting piece at a part abutting on a contact support of a lever, and providing a lever support face opposing to a receiving groove for the contact support to meet with this projecting piece. CONSTITUTION:A projecting piece 16b extending laterally from a lever 16 is arranged at a part abutting on a contact support 17 of the lever 16, while a lever support face 17b to meet with the projecting piece 16b is arranged adjacent to a part 17 abutting on the lever 16. The face 17b is formed opposing to a receiving groove 6a of an upper case 6. The lever 16 positioned in an axial direction being sandwiched by the groove 6a and the face 17b has a small rotary radius from the groove 6a to the piece 16b, and therefore only small looseness is needed between the groove 6a and the face 17b so that fluctuation in an arm having a length from the part 16a to a projection 16c is reduced. It is thus possible to improve the contacting reliability and stabilize the movement. |
