Abstract: A rotary concrete surface grinding and smoothing device having a segmental diamond chip impregnated, engine-driven, rotating grinding head; a foot-operated unit for raising and lowering the grinding head with relation to the surface to be ground; a slanted front end for better visibility; and, ballast weight and adjustable axle means to incrementally vary the downward pressure of the grinding head on the to be ground surface.

Abstract: A portable apparatus for surface treatment with particulate material thrown onto the surface at high velocity is disclosed. The apparatus includes a device or features for removing from the surface the particulate material and debris generated by the treating process. The removing features include a magnetic drum for attracting ferromagnetic material, a vacuum packup for removing nonmagnetic material, and a plurality of air jets for positioning and lifting the material to increase the efficiency of the recovery process. The recovered material is separated according to content and the particulate is recycled for reuse.

Abstract: A method for removal of layers of organic material built up on a support for articles during surface coating and treating comprising applying a liquefied inert gas to the support and/or preferably to the built up layers of organic material to cause embrittlement of the organic material and lessening of the bonded relation between the support and the built up layers, and then separating the embrittled built up layers from the support by abrasion of impact.

Abstract: This invention relates to a portable upblast cleaning head which makes use of an airless centrifugal blasting wheel for throwing particulate in an upwardly direction against the underside of a horizontally disposed surface. The head includes means for effecting a sealing relation with the surface to be treated and for recovery and air wash separation of the blasting particulate from deposits and residue which are removed by the blasting process. The separating means is contained directly in the blasting head so that a completely portable and self-contained unit capable of recycling the particulate is obtained.

Abstract: A sand reclamation system is disclosed for reconditioning and sizing sand utilized in precision molding. The system includes particulate blasting wheels for breaking down the sand molds and reducing them to discrete particles. A conveyor, a first air wash for separating the particulate used for blasting from the granular sand and a second special air wash for separating undersized sand particles from those which may be reused for further molding. The second air wash utilizes a modified air wash separator employing a surge bypass arrangement to insure a constant feed rate therethrough.

Abstract: A single-slide, mechanically and electrically programmed grinding machine comprising a rigid enclosed base, a fixed workhead assembly on the base, a pair of parallel slidebars mounted on the base, and a wheelslide assembly mounted on the base for longitudinal displacement thereover. Longitudinal wheelslide displacement is mechanically controlled by a motor-driven cam bearing against a spring-biased lever pivoted to the base and connected to the wheelslide via a rod. Lateral feed is independently electrically controlled by a motor-driven nut and screw shaft assembly which angularly displaces the wheelslide assembly relative to one of the slidebars and about the centerline of the other slidebar. An eccentric and variable-position spacer is provided for reciprocating the wheelslide during a grind operation. A thermally-stable base configuration is disclosed. Part load and unload apparatus, all mechanically programmed, are also disclosed.

Abstract: Complex aspheric optical surfaces may be made reliably and relatively rapidly by a method in which one surface of a relatively thick glass block is ground and polished to the desired aspheric surface, which may be tested in a system including master optics of the remaining components. This master die block may then be used to generate reverse die plates by drawing thin glass blanks against the configured surface thereof and polishing to an optical flat. These reverse die plates are then mounted on a base die block and deformable glass blanks are drawn against the configured surface thereof and the opposite surface polished to an optical flat. Upon removal, the glass blanks assume a curvature identical to the original aspheric surface of the master die block.

Abstract: Conjugate filaments containing components located in a side-by-side or eccentric sheath/core structure are formed by directing superposed layers of the polymer components across the surface of a spinneret plate into narrow channels, the channels being contained in a member integral with the spinneret plate, to form narrow streams which are extruded through extrusion orifices located below the narrow channels in a spinneret plate.

Abstract: A valve member for abrasive blasting machine in which the valve member is formed of a valve plate of magnetic material sandwiched between plates of larger dimension than the magnetic plate but of lesser dimension that the passage through which the abrasive material passes from the supply source to the blasting wheel whereby the annular space between the valve member and the inner walls of the passage becomes filled with abrasive material attracted to the valve member in closed position to close the passage.