When the second member is rotated as a driving member, {HEAD ~ a recess defining wall} contacts {TAIL ~ an arm} of the third member and drives the first member through the frictional contact of the third member therewith 
contacts
When the second member is rotated as a driving member , { HEAD ~ a recess defining wall } contacts { TAIL ~ an arm } of the third member and drives the first member through the frictional contact of the third member therewith
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH