Further, at least one embodiment provides {HEAD ~ an assist mechanism} that includes a pressing device, a stopper mechanism, an engagement member, {TAIL ~ a catch portion}, and a release member 
Further , at least one embodiment provides { HEAD ~ an assist mechanism } that includes a pressing device , a stopper mechanism , an engagement member , { TAIL ~ a catch portion } , and a release member
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH