| 摘要 |
PURPOSE:To simplify and facilitate the fitting to as well as the removal from the rear cover, of the front cover by providing a taper on the fulcrum pin on the rear cover or the projection on the front cover. CONSTITUTION:A couple of tapers 40a, 40b tilted in the reverse direction are provided to the side face of the opposite side of a couple of left/right fulcrums 18a, 18b of the rear cover 5. In fitting the rear cover 5 to the front cover 4, after a couple of the fulcrum pins 18a are inserted obliquely from the direction of the arrow (f) in a pin insertion hole 20a of one projection 19a, the rear cover 5 is turned in the arrow (g) while one fulcrum pin 18b is used as a turning fulcrum, and the other fulcrum pin 18b is pushed into the pin insertion hole 20b of the other fulcrum pin 18b is pushed into the pin insertion hole 20b of the other projection 19b. In removing the rear cover 5 from the front cover 4, the other fulcrum pin 18b is used as the turning fulcrum and the rear cover 5 is turned in the direction of arrow g' and one fulcrum pin 18a is taken out from the pin insertion hole 20a of one projection 19a. Thus, the fitting and removal of the rear cover from/to the front cover is facilitated.
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