Abstract: A process and apparatus for dry lens generation of a plastic optical lens includes a chamber structure in which the lens grinding tool and the lens blank holder are positioned. The chamber is provided with a large unobstructed inlet and an outlet connected in communicating relation to a vacuum system so that the high volume, high velocity stream of ambient air is directed across the interface between the grinding tool and the lens blank to thereby entrain the cut plastic material in the stream for evacuation through the outlet. The grinding tool is diamond plated and the spacing between the diamond elements is of a sufficient magnitude to permit single point cutting of the material to thereby eliminate any tendency of the material to adhere to the grinding tool. A misting nozzle discharges a fine lubricating mist across the lens blank grinding tool interface when a lens is being formed from polycarbonate.

Abstract: This tool defines an inner opening (2) having a polygonal inscribed profile having six or twelve angles, said profile comprising grooves (3) at the place of said angles for the purpose of clearing the edges of the nut or bolt body to be driven, these grooves (3) being disposed between bearing surfaces (4) adapted to come into contact with the flat surfaces of said body so as to transmit the tightening or untightening torque.

Abstract: The present invention relates to a tool which can be used to securely hold a multiplicity of nails for hammering into a vertical wall or against a ceiling in addition to hammering nails downward against a horizontal surface. The same tool can also be effectively used as a shield to protect the surface being hammered against a blow from the hammer if the worker should miss the nail. Additionally, the same tool can be used as a finishing nail set and is useful in this application for both left-handed and right-handed people.

Abstract: A small hand tool such as a carpenter's hammer is disclosed as having a head which is pivotally connected crosswise to its handle. The head is provided with abutment faces which at different inclinations of the head to the handle are selectively aligned with the blunt end of a latch rod threadedly connected to the handle within a provided axially extending bore. Rotation of a larger-sized operating knob at the rearward end of the handle effectively advances and retracts the latch rod to releasably lock the hammer head to the handle in the selected position to which it is adjustable thereon.