Abstract: This invention relates to the construction of a pantograph jack and, in particular, to an improvement in the construction of a pantograph jack wherein the pins connecting the arms to the base and load rest of the jack are replaced with extrusions emanating from those parts. In particular, the pantograph jack of this invention has four arms, including two lower arms, and two upper arms. Each of the lower arms has a gear end to rotate with respective gear ends mounted in a base, meshing to control the rotation of one lower arm with respect to the other lower arm. Each of the upper arms has a gear end mounted in a load rest to rotate with the gear ends of both upper arms meshing to control the rotation of one upper arm with respect to the other upper arm. The improvement comprises axles extruded at positions on axes of rotation of one or more of the gear ends, and the axles providing means to mount the arms in the base or the load rest.

Abstract: A jack configuration, which may be characterized as a half scissor jack, which achieves the objects of simplifying manufacture by reducing component parts and limiting overall size of the jack while providing the requisite load bearing and height variation characteristics appropriate to the intended vehicle lifting and which furthermore reduces the potential for a torsional deflection in the base channel. Torsional deflection is reduced by creating a box section in the base channel, preferably by providing a channel bracket structure that spans the base channel to maintain the spacing of the side walls of that component.

Abstract: This invention relates to the construction of pantograph jacks and, in particular, relates to the construction of an improved trunnion for connecting the pantograph jack arms to the drive shaft. In particular, a pantograph jack is disclosed that has at least one joint including an end of an upper arm, an end of a lower arm, and a drive screw shaft all connected by a trunnion means. The improved trunnion comprises a rectangular plate having a length extending from a first end to a second end, and including a substantially flat first section, a curved second section folded back over the first section to juxtapose the second end to the first end, and the first section and the second section having first and second holes, respectively, aligned and sized to receive the drive screw shaft for sliding movement.

Abstract: This invention relates to the construction of a pantograph jack and, in particular, to an improvement in the construction of a pantograph jack wherein the pins connecting the arms to the base and load rest of the jack are replaced with extrusions emanating from those parts. In particular, the pantograph jack of this invention has four arms, including two lower arms, and two upper arms. Each of the lower arms has a gear end to rotate with respective gear ends mounted in a base, meshing to control the rotation of one lower arm with respect to the other lower arm. Each of the upper arms has a gear end mounted in a load rest to rotate with the gear ends of both upper arms meshing to control the rotation of one upper arm with respect to the other upper arm. The improvement comprises axles extruded at positions on axes of rotation of one or more of the gear ends, and the axles providing means to mount the arms in the base or the load rest.

Abstract: A lifting jack for automobiles has an extension arm with a particular fastener which may be used to connect longitudinally elongated tubular sections. A series of interlocking sections are provided which need not be identical (e.g. in particular having different ends). The sections are linked in a positive lock (snap fit) by a fastener having one or more resilient legs biasing a lug.

Abstract: A lifting jack for automobiles has an extension arm with a particular fastener which may be used to connect longitudinally elongated tubular sections. A series of interlocking sections are provided which need not be identical (e.g. in particular having different ends). The sections are linked in a positive lock (snap fit) by a fastener having one or more resilient legs biasing a lug.