Referring to FIG 5, when pushing the slidable member 70 toward the longitudinal plate 60, the hook portion 721 slidably presses the first sheet 50 tilt {HEAD ~ the slidable member} 70 is stopped by {TAIL ~ the contacting flange} 74 contacting the first flange 63 
is stopped by
Referring to FIG 5 , when pushing the slidable member 70 toward the longitudinal plate 60 , the hook portion 721 slidably presses the first sheet 50 tilt { HEAD ~ the slidable member } 70 is stopped by { TAIL ~ the contacting flange } 74 contacting the first flange 63
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH