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.

Abstract: Disclosed is a ball joint assembly for a gas spring. The ball joint assembly includes a ball joint provided at both ends of the gas spring. The ball joint is formed at an inner portion thereof with a ball insertion hole, into which upper and lower backup rings are sequentially accommodated so as to prevent a support ball of a ball stud from being spaced from an inner wall of the ball insertion hole when the support ball of the ball stud is inserted into the ball insertion hole. An inner nut is coupled into a lower portion of the ball insertion hole or a washer is inserted into the lower portion of the ball insertion hole through a caulking process so as to prevent the upper and lower backup rings from being separated from the ball insertion hole. The ball insertion hole of the ball joint includes an opening section, which is positioned opposite to the ball receiving section.