Patent ID: 6969208

Claim:
A slider for holding a stick of a solid paste for use in a solid paste dispenser, said solid paste dispenser comprising a cylindrical casing and a screw rod for engaging in threaded manner with said slider and forming an integral part of a tail plug fitted in one end of the casing for rotating the screw rod and for moving the slider so that the paste may be protruded out of the casing at the distal end thereof or retracted thereinto, said slider including a planar base portion and a tubular portion projecting from a center of the base portion into the paste, said screw rod being adapted to extend through the base and tubular portions for engaging therewith in threaded manner, the tubular portion having as an integral part thereof a radially outwardly extending protrusion which is formed so as to satisfy the following equation (1): S 0 âˆ’S M â‰§S (1) where S 0 stands for the area (cm 2 ) of the upper surface of the base portion; S stands for the area (cm 2 ) of the lower surface of said protrusion; S M stands for a maximum area (cm 2 ) of S; each of S 0 and S excludes the area occupied by the tubular portion; wherein said protrusion is formed so as to further satisfy the following equation (2): CaP ( S h )/{( h+d )} =Naâ‰§ 20â€ƒâ€ƒ(2) where h stands for the distance (cm) between the base portion and the protrusion; d stands for the thickness (cm) of the protrusion; P stands for the hardness (N/cm 2 ) of the paste; Ca is a constant; Na stands for the falling force (N) of the paste.