| 摘要 |
PURPOSE:To reduce the number of parts used for assembling a plate spring without spoiling the bent angle accuracy of the plate spring so as to improve the assembling property, by fitting the plate spring equipped with plural supporting pin retaining pieces extended from the edge of a pinhole toward the center of the pinhole along the plate spring holding inclined surface of a case. CONSTITUTION:A plate spring holding inclined surface 15 with a prescribed angle is provided in a lower case 5a and a plate spring 3 equipped with a supporting pin retaining piece 17 is put on two supporting pins 6 projected from the inclined surface 15, and then, the plate spring 3 is fixed to the lower case 5a by melting down the pointed end of the pin 6 by ultrasonic welding. The inclination 12b of the inclined surface 15 is basically equal to the bent angle of the plate spring. In addition, the upper limit contact 16 of the plate spring 3 with the inclined surface 15 is positioned as in the case of conventional ones. It does not matter how many pieces of plate springs are used if one or more pieces of plate springs are used.
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