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 {HEAD ~ its neutral pivoted position}, toward {TAIL ~ the straight side} of the peripheral wall of the casing 
toward
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 { HEAD ~ its neutral pivoted position } , toward { TAIL ~ the straight side } of the peripheral wall of the casing
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