Abstract: A rocking seat for children's amusement generally consisting of a seat assembly mounted on a base assembly securable to a support surface. The base assembly includes a body of resilient rubber material and has an overhanging portion that enhances the rocking motion of the seat assembly when a child seated in the seat assembly rocks back and forth. The body further has upper and lower flanges and a web portion interconnecting the flanges providing for a 360.degree. rocking movement.

Abstract: In a power shovel having a main support unit, a front end assembly operatively connected to the main support unit and a rope crowd system mounted on the main support unit and operatively connected to the front end assembly, a crowd drive assembly for the rope crowd system comprising a rope drum mounted on a support frame supported on the main support unit, a drive shaft journaled in the support frame adjacent the tangential point of the crowd rope wound on the rope drum, transversely spaced means disposed on the drive shaft for transmitting torque to the rope drum and an appropriate motor and gear arrangement supported on the main support unit for driving the drive shaft.

Abstract: Disclosed is a method for manufacturing an object of silicon nitride. In the method, a body preformed from silicon nitride is surrounded with a casing which is permeable to gas. Upon heating, the casing is transformed into a layer which is impermeable to a pressure medium which is used during isostatic pressing of the preformed body while a pressure outside the casing is maintained which is at least as high as the pressure of the gas which is present in the pores of the preformed product. After the casing has been made impermeable to the pressure medium and the preformed body has been enclosed therein, the isostatic pressing is carried out while the body is simultaneously sintered.

Abstract: The disclosure relates to a process and apparatus for the treatment of sodium-nitrate-containing electrolytes during the electrochemical machining of the surfaces of iron-containing workpieces. By adding an oxidizing agent, more particularly ozone, increased production of nitrite in the electrolyte is prevented and, thereby, premature passivation of the surface of the workpiece during the electrochemical metal removal. An apparatus for the oxidation of the electrolyte is comprised of a processing station inserted into the electrolyte circuit, an ozone generator, and a reactor.

Abstract: A device for mounting an aircraft engine and a propeller on a longitudinal member or fuselage of a lightweight aircraft. A sleeve is disposed about the longitudinal member and securing devices which prevent longitudinal movement of the sleeve relative to the longitudinal member are positioned at either end of the sleeve. Vibration dampening rings are disposed between the securing devices and cups which can be threaded along the sleeve placing the rings in the desired compression. The engine and the propeller are mounted on the sleeve. A driving sleeve is rotatably mounted on the sleeve and is drivingly attached at one end to the output of the engine and is mounted at the other end to the propeller. The propeller is rotatable about the longitudinal axis of the longitudinal member and the wing structure and tail structure can be mounted on the longitudinal member as well with the propeller positioned between them. The mounting device can also be used for biplanes.

Abstract: A children's climber for parks and playgrounds generally consisting of a first arcuately shaped rail member having end portions supportable on the ground, a second arcuately-shaped rail member having end portions supportable on the ground, such rail members lying in intersecting planes, and a plurality of rungs interconnecting the rail members providing a helical climbing course.

Abstract: A composition for treating dental infections, e.g. dental caries caused by Strep. mutans, comprises a varnish containing an antimicrobial agent such as chlorhexidine acetate and benzoin gum in an orally acceptable liquid. The composition can be painted on teeth, allowed to dry thereon to give a transparent, translucent or tooth colored film which is effectively invisible but provides sustained release of the antimicrobial agent to the site of infection over a period of at least four days. The film can be removed at will, e.g. by application of the liquid varnish base.

Abstract: Disclosed are a method and an apparatus for filling bottles with liquid to a predetermined fill height. A suction pipe is positioned relative to the bottle so that the pipe extends through the mouth of the bottle and the lower edge of the pipe is disposed at a fixed distance from the upper edge of the bottle and at a level slightly above the level of the predetermined fill height. Liquid is delivered by gravity into the bottle until the liquid level reaches the lower edge of the slightly elevated suction pipe. Then the suction pipe is lowered to the predetermined fill height and the supply of liquid is interrupted. The space above the liquid level in the bottle is connected with the outer atmosphere and excess liquid is drawn off by suction through the suction pipe until the liquid level in the bottle has dropped to the lower edge of the suction pipe.

Abstract: A tying device for shoelaces which can be attached to the shoe and serves to maintain tied laces in their disposition. The device includes a body portion which remains exposed for viewing by the public and an eyelet member which receives the laces for securing the device to the shoe. An elastic band is integrated with the body portion and eyelet member for stretching over a shoelace knot to lock the device in place and prevent the shoelaces from becoming untied.

Abstract: A machine for transferring pipe between the floor of a drilling rig and a pipe rack including a stationary trough positioned below the drilling rig floor and a movable trough aligned with the stationary trough and having one end resting on the drilling rig floor and the other end movable vertically relative to the end of the stationary trough nearest the drilling rig. An operator's cab is attached to and supported by the end of the stationary trough distant the drilling rig floor. The cab has a housing which is pivotally attached at its forward edge to the stationary trough whereby the housing may be pivoted forward 90.degree. onto the stationary trough for ease of transporting the machine. The operator's cab further includes a control panel mounted to the stationary trough and not pivotal with the housing. A lifting device attached underneath the stationary trough can cam the stationary trough up off of its support surface until it rests on rollers.

Abstract: The invention relates to a method and an apparatus for the treatment of surfaces of a workpiece of carbon-containing cast iron, and in particular of blind holes in gray iron cast workpieces, by electrochemical stock removal and mechanical reaming-and-plating. Electrochemical stock removal and mechanical reaming and plating are carried out in separate steps whose operating parameters are independently adjustable, the mechanical stock removal being essentially confined to a reaming-and-plating of the surface which does not entail a closing of graphite flakes. A cylinder bore produced by the method of the invention with desired roughness will have a dark, lustrous surface.

Abstract: In a tufting needle for tufting machines comprising an operative shank portion of oblong cross-section and containing a thread guide and eye and an anchoring shank portion by which the needle is embedded in a needle module, said anchoring portion is of elliptical or rhombic cross-section and the major axes of the cross-sections of both portions are disposed in substantially the same plane.

Abstract: An object of ceramic or metallic material is manufactured by isostatic pressing of a body preformed from a powder of the metallic or ceramic material, the preformed body (10) then being embedded in glass, for example in a mass of glass particles (16) in a vessel (15) which is resistant to the temperature at which the sintering of the metallic or ceramic material is carried out, the material embedding the preformed body being transferred to a melt having a surface limited by the walls of the vessel, below which surface the preformed body is located, and a pressure necessary for the isostatic pressing of the preformed body then being applied on the melt by a gaseous pressure medium.

Abstract: A multi-purpose welding power supply to provide different modes of welding from a single unit. Two positive output terminals are provided, one for low amperage welding up to about 300 amp which includes an inductor and slope resistor and one for high amperage output up to about 600 amp which bypasses the inductor and slope resistor in the low amperage circuit. A pulsing circuit is provided to impose on the 300 amp output either 60 pps or 120 pps pulses on a standard direct current background. A variable pulse width control circuit is integrated with the pulsing circuit to vary the pulse width. A "hot start" feature is included with the 60 pps welding mode to provide 120 pps pulses for an initial pre-selected time period.

Abstract: An apparatus for transferring pipe between pipe racks and the drilling rig floor including a stationary trough located below and extending towards the drilling rig and a movable, inclined trough aligned with the stationary trough having one end supported on the drilling floor and the other end powered to move between a lower position for transferring pipe to and from the stationary trough and an upper position for transferring pipe to and from the drilling floor. Two pair of racking legs extending between the pipe racks and the fixed trough are provided. Each leg has a cradling lug which moves up and down the leg powered by a hydraulic cylinder, thereby lifting the pipe along the leg. Further, each leg is able to pivot in two directions about a pivoting structure. The pipe when moving in the troughs is held at one end by a shovel member which is engageable by the buggy traveling along the stationary trough and is also engageable by the carriage in the inclined trough.

Abstract: The container for photographs of the same size comprises a housing from which a slide can be pulled out. In the housing there is a spring arrangement which presses the photographs against a viewing window of the housing. The spring arrangement comprises leaf springs which, when the slide is pulled out, are pressed away from the viewing window by control edges moulded to the slide, directly at the start of pulling out of the viewing window, and remain pressed away during further pulling out of the slide.

Abstract: New semi-synthetic antibiotic derivative are formed from N-methanesulfonic acid derivatives of 3-O-demethylistamycin B which are less toxic than the parent 3-O-demethylistamycin B and retain usefully high antibacterial activity of the parent antibiotic. The new derivatives are produced by a method of N-sulfomethylation where 3-O-demethylistamycin B is reacted with an aldehyde such as paraformaldehyde and sulfurous acid or sulfite reagent.