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 the straight side of {HEAD ~ the peripheral wall} of {TAIL ~ the casing} 
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 the straight side of { HEAD ~ the peripheral wall } of { TAIL ~ the casing }
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