Abstract: This invention relates to a jack of a pantograph type, especially to the improvement of pivot joint mechanism of jack comprising screw nut body engaged with screw, metal body having screw bearing hole and end portions of a pair of upper and lower grooved links, and constituted by combining the upper and the lower grooved links with the screw block in which the screw block having unidiameter passes through an inserting hole formed on two side wall portions of end portions of the upper and lower grooved links to extend the two end portions of screw block for projecting outwardly. In this state, a plurality of projections for stopping are formed by plastic working with separating each other around axial periphery on the portions of screw block adjacent to inner and outer face of two side wall portions of the upper and lower grooved links respectively.

Abstract: The chargeable working light of the present invention utilizes an electrical circuit to achieve the functions of charging a storage battery from a power source, and of alternatively supplying power to a lighting element from the power source and the battery simultaneously. In addition, the structure of the chargeable working light gives facilities for being adjusted to properly provide illumination from a desired place and direction.