Abstract: Box for mounting diffusers, wherein the main body of the box is made of expanded plastic or other similar material, and wherein one or more connection elements are molded within the walls of the box to provide for connection of the box to a building structure and to a duct, and to reinforce the box.

Abstract: Automatic adjustable wrench wherein one jaw is adjustable by movement of a toothed surface of the jaw along a toothed support. The movable jaw is spring biased to close against an object disposed between the jaws of the wrench, and hence is automatically adjusted.

Abstract: Pipe handling apparatus for pipe laying barges, sometimes called lay barges, wherein pipe is lifted from an incoming pipe conveyor to a transverse rack, from one rack position to another, and from the rack to the pipe line-up conveyors, by a series of pivotal lifting means which lift, move, and deposit the pipe without impact or shock, whereby the pipe and any concrete or other coating on the pipe is not damaged. In addition to the novel pipe transferring means, the invention presents a novel universally adjustable line-up conveyor apparatus.

Abstract: Steering means, particularly for use with internal pipe bending mandrels, wherein upper and lower driven wheels are mutually expanded against the pipe wall by an intermediate free-floating hydraulic cylinder, and wherein at least one of the upper and lower driven wheels are rotatably disposed to provide steering. The steering assembly is affixed as a support at one end of the mandrel and serves to keep the mandrel upright within the pipe.

Abstract: Louver fan assembly including a housing for mounting a fan at an angle in line with the slats of the louver. The invention also provides an improved design of louver for use with the housing and fan.

Abstract: Apparatus for scraping the interior sides of the walls of pipes, having ractable scraper elements at each end of a carrier body. The scraper apparatus is preferably moved in both directions through a pipe, the trailing scraper elements preferably being retracted during movement of the apparatus in each direction. The apparatus is particularly designed for removal of coating materials such as cosmoline from pipes before use of the pipes in pipelines.

Abstract: Soil stabilization methods and apparatus whereby a material such as lime is introduced to soil beneath the earth's surface. The lime or other treating material is applied to the soil in slurry form. The slurried material may be introduced at depths from just beneath the ground surface down to depths of 15 to 20 feet, or even deeper.

Abstract: Fans for use with turbine ventilators and apparatus and methods for supporting the same, wherein the fan is supported spaced from the entrance to the turbine ventilator whereby aspiration increases the air flow through the ventilator.

Abstract: Dampers operable by energization of an electrical circuit or by deenergization thereof to open or close, for control of smoke ventilation in case of a fire. The dampers are held closed, or open, either by a magnet or by a spring. The dampers may be used in ventilation systems of any other type.