Abstract: A picture hanger for use with gypsum board comprises a strip of steel bent into a V to provide two legs. The first leg is arcuate and functions as an anchor upon insertion into the gypsum board. The second leg is straight, with a hook at its terminus for hanging pictures and the like. An installation tool is provided which enables the arcuate anchor leg to be driven into the gypsum board along an arcuate path corresponding to the arcuate anchor leg until the second leg is held firmly against the surface of the gypsum board.

Abstract: A method for installing a hanger in gypsum board wherein the hanger comprises a steel strip bent into a Vee to provide two legs, the first leg being arcuate with a pointed end and functioning as an anchor when installed in the board, and the second leg being straight and having a u-bend formed at its terminus to function as a hook, the method comprising: providing a tool comprising a first leaf and a second leaf formed from flexible strips, the leaves being secured to each other at their distal ends so that the faces of the leaves are urged against each other along their lengths, with the first leaf having a slot formed therein adjacent its proximal end sized to receive therethrough the u-bend at the terminus of the second leg of the hanger; inserting the u-bend of the hanger through the slot so that the u-bend is captured between the leaves; placing the tool against the wall of the board with the outer face of the second leaf in contact with the wall and with the pointed end of the first leg of the hanger in

Abstract: Method and apparatus for improving the efficiency of the rotating cutter of a tool by converting at least part of the rotational torque applied to the cutter to repeated rotational impact forces.

Abstract: In accordance with the present invention, a system is provided for circulating fluids, both gases and liquids, in a body of liquid. The system comprises a rotatable shaft having a tubular segment immersed in the body of liquid. The tubular segment of the shaft is in fluid communication with the fluid to be circulated. Means are provided for rotating the shaft. One or more tubular arms extend radially outwardly from the tubular shaft segment, and are in fluid communication with the tubular shaft segment. Each tubular arm comprises an extension spring which, under static conditions, is substantially straight but which upon rotation of the shaft is believed to be arcuately deflected by hydrodynamic force so as to impel fluid into the body of liquid. The system may be utilized for simply circulating the liquid, or for injecting a gas into the body of liquid.

Abstract: A system for aligning the bit of a hand-held tool with the surface of a workpiece wherein a laser beam essentially parallel to the axis of the bit is projected forwardly toward the workpiece and onto a mirror maintained at a preselected angle to the workpiece surface. The incident beam is reflected backwardly onto means detecting both the incident beam and the reflected beam and indicating when the beams are coincident.