Abstract: A machine for performing notches of controlled depth in cabinet component parts and the like. The machine consists in part of a main frame with a plurality of elongated support members of equal length. A plurality of tools are mounted to said main frame, consisting in part of a plurality of cutting blades which with the aid of a plurality of guides assist in making a plurality of predetermined notches. The operating sequences herein are preferable but not necessarily limited to manual control.

Abstract: This invention relates to a cooling and heating system which operates on the absorption and phase change heat exchange principle. More particularly it relates to a continuous heat actuated, air cooled, double effect generator cycle, absorption system. In further aspects, this invention relates to a system constructed for use with an absorption refrigeration solution pair consisting of a nonvolatile absorbent and a highly volatile refrigerant which is highly soluble in the absorbent. A disclosed refrigerant pair are ammonia as the refrigerant and sodium thiocyanate as the absorbent. An absorption cycle is disclosed using the thermo physical properties of sodium thiocyanate/ammonia, absorption/refrigerant pair.

Abstract: A concrete slab hand finishing tool is provided with, in combination, a flat floor surface working area, a lip offset surface working area joined to the flat floor surface working area, a flat lip surface working area joined to lip offset working area, and an edge surface working area joined to the flat lip surface working area.

Abstract: A metal processing furnace of the indirect arc type employing opposed electrodes projected into an ionizable atmosphere is provided with novel filter-like, vapor nucleation means which enables the furnace to be utilized for numerous different metal melting/smelting operations in a manner which precludes the presence of metals and metal oxides in their vapor or particle forms in process effluent gases delivered from the furnace. The furance achieves substantial operating advantages in the manufacture of ferroalloys, silicon and beryllium-copper metals, and comparable products including carbides such as silicon carbide.

Abstract: A metal processing furnace of the indirect arc type having opposed electrodes projected into and establishing an ionized atmosphere in the furnace crucible is provided with apparatus that introduces a finely divided charge mixture consisting essentially of silica and coke into the system for free-fall into and through the ionized atmosphere. Following reaction of the mixture's ingredients in the ionized atmosphere, silicon carbide crystals are deposited at the bottom of the furnace interior below the ionized atmosphere for subsequent collection and removal from within the furnace system. By control of charge composition and process parameters, silicon carbide crystals having predominantly either alpha or beta crystalline structures and with crystal sizes predominantly in the range of 250 to 3,000 microns are produced.

Abstract: Porous refractory shapes having sufficient strength for use as thermal insulation in metal melting furnaces at insulation service temperatures of 3,400.degree. to 3,900.degree. F are formed in place by bonding refractory particles of alumina, for instance, with aluminum hydroxide generated by the reaction of aluminum with water in the presence of a corrosion accelerator, and either with or without a reaction control agent satisfactory for eliminating or significantly suppressing the evolution of hydrogen, nitrogen dioxide, hydrogen chloride, or the like from the reacting mass or for reducing the rate of reaction corrosion.

Abstract: Compacted refractory shapes having sufficient densities for lining metal melting furnaces and use at service temperatures of 3,400.degree. to 3,900.degree. F to retain molten metal are formed in place by bonding refractory particles of alumina, for instance, with aluminum hydroxide generated by the reaction of aluminum with water in the presence of a corrosion accelerator, and either with or without a reaction control agent satisfactory for eliminating or significantly suppressing the evolution of hydrogen, nitrogen dioxide, hydrogen chloride, or the like from the reacting mass or for reducing the rate of reaction corrosion.

Abstract: An indirect arc metal melting furnace of the type having an insulated and essentially sealed or closed exterior shell is operated in a novel manner which thereby improves the electrical operating characteristics of the furnace.