Abstract: A sold prop rod for a folding-type seat includes a prop rod body having an end portion, a lock nut coupled to the end portion, a housing engaged with the lock nut, and a rotating member disposed between the end portion of the rod body and the lock nut to permit the rod body to be rotated with respect to the housing.

Abstract: A ball joint of a gas spring and a method for manufacturing the ball joint are disclosed. A gap preventing member is mounted to a support ball of a ball stud inserted into a ball insertion recess of an end socket and an adhering member which adheres the gap preventing member is provided, so that the ball joint maintains the operational force normally even after the generation of wear due to a long time use. Further, by manufacturing the ball joint by pressing and welding, the manufacturing cost is reduced and the manufacturing process is simplified.