US Patent 7891735 Hook member and latch structure of upholstery material

A hook member is provided and includes a pinching portion that pinches a plate body of a seat frame, a fixing portion that can fix an upholstery material, and an introduction portion defining an opening into the fixing portion, wherein the fixing portion faces an outer side of the plate body and is pinched by the pinching portion, and includes the introduction portion having a curved shape and defining an opening for the upholstery material to enter and be fixed therein.