Coil springs are connected between the casing and lid member of pivotally urging the latter to a neutral pivoted position in which the plate portion is centered between the projecting edge portions and bodily urging the lid member, in its neutral pivoted position, toward {HEAD ~ the straight side} of {TAIL ~ the peripheral wall} of the casing 
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Coil springs are connected between the casing and lid member of pivotally urging the latter to a neutral pivoted position in which the plate portion is centered between the projecting edge portions and bodily urging the lid member , in its neutral pivoted position , toward { HEAD ~ the straight side } of { TAIL ~ the peripheral wall } of the casing
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