Abstract: A mobile chair lift for raising wheelchairs from ground level to a level such as to enable rolling the wheelchair onto a porch or other flat surface providing for entrance to a home or place of business wherein there is a base frame, a platform, legs mounting the platform on the base frame, kinematic linkage for raising and lowering the platform and maintaining it horizontal during such movement, a reversible motor for actuating the linkage and switches mounted on the platform and on the base frame for controlling operation of the motor. The platform has downwardly-open channels at its opposite longitudinal sides for receiving the legs at ground level and there is a ramp transversely of the forward end of the platform for raising the wheels from the ground onto the platform.

Abstract: The combination with an electric drill of a spirit level, a foot provided with a spindle, the axis of which is at right angles to the surface of the foot by means of which the foot may be mounted in the drill chuck with its surface at right angles to the axis of the drill and a band encircling the electric drill, said band mounting the spirit level thereon such as to enable positioning the bubble in the level at a predetermined position for the angle of the shaft relative to the plane surface to be drilled such that when the foot is replaced by a drill, the drill may be positioned at said angle to said surface by positioning the bubble at said predetermined position.

Abstract: An attachment for a conventional lathe having work-supporting means for rotating a workpiece about a predetermined axis, a cross slide movable at right angles to the axis of rotation of the work supporting means and motor means for effecting rotation of the work supporting means and traversing of the cross slide, said attachment being designed to support a tool for rotation about an axis situated in a plane containing the said predetermined axis and for rectilinear movement axially at right angles to said predetermined axis. The tool is provided with one or more cutting elements such as a bit or a plurality of bits arranged at an angle of substantially 18 degrees to the axis of rotation of the tool. Other cutting devices may be substituted for the bits as, for example, grinding tools, lapidaries, twist drills, routing tools and the like. The attachment as thus described is particularly adapted to generating spherical surfaces to a high degree of accuracy and surface smoothness.