Abstract: A fire grate assembly for stoker incinerators. A plurality of stationary and movable grate members are alternately arranged in the assembly. The assembly also has a preventing member, such as a liner plate, which is detachably mounted to an end of each of the movable grate members for preventing the stationary grate members and the movable grate members from directly contacting each other, while allowing the movable grate members to be linearly movable relative to the stationary grate members. The preventing member is replaceable and can have a countersunk hole, thus being adapted for bolting the end of each of the movable grate members.

Abstract: A method of manufacturing an ultrasonic generator adapted to ultrasonic sterilizers, for minimizing the heat input of a magnetostrictive element, comprises the steps of: forming, on a wave guide, melting layers constructed of joining materials such as Al--Si alloy and Sn--Ag alloy which melt within a temperature range of 575.about.590.degree. C. and 230.about.250.degree. C., respectively, and have tensile strength of 17.about.25 kg/mm.sup.2 and 10.about.15 kg/mm.sup.2, respectively; and joining the wave guide with the magnetostrictive element.

Abstract: A twin-fluid atomizer including upper and lower plates connected to each other by the use of bolts; gas supply pipes each provided to the side of the upper plate; a liquid delivery tube defining an orifice and fixed to the top of the upper plate by the use of a bolt; and a connector body fixed to the lower plate and the outer wall of the orifice of the liquid delivery tube, thus defining an annular gas supply channel. The lower plate has an interchangeable connector stem attachable to the connector body and rotatable via cogs formed on the connector stem. The orifice of the liquid delivery tube and connector forming an annular gas flow passage have outlets with a plane or oblique cross section respectively, and the plane or oblique cross section of each outlet is adjusted and/or rotated to provide a symmetric or asymmetric spray pattern. A bushing interposed between the liquid delivery tube and the upper plate to adjust the length of a protrusion of the liquid delivery tube.

Abstract: Provided is a circuit for driving a magnetostrictive device including: a high voltage interrupting circuit section for interrupting an instantaneously leaking high voltage depending on the switching operation of a power switch; a voltage storage section for rectifying an input voltage for a half of the positive cycle and storing it; a switching circuit section for supplying the voltage stored in the voltage storage section to the magnetostrictive device; and a voltage discharging circuit section for discharge the voltage remaining in the voltage storage section when the power is interrupted.

Abstract: Lead-free alloys for use as solders for copper and copper alloys. In the alloys, tin (Sn) and bismuth are the basic components and either one or both of antimony (Sb) and zinc (Zn) may be added as major elements to yield a low melting temperature alloy, and small quantities of one or more of aluminum (Al), magnesium (Mg) and tellurium (Te) may be added as elements capable of improving a soldering characteristics and properties of alloy. In preferred embodiments, the alloys contain bismuth (Bi) in a range of 1.0-20 wt %, and one or more of antimony (Sb) in the range of 0.1-8.0 wt %, more preferably 0.1-3.0 wt %, zinc (Zn) in a range of 0.01-3.0 wt %, aluminum (Al) in a range of 0.01-3.0 wt %, magnesium (Mg) in a range of 0.01-3.0 wt %, and tellurium (Te) in a range of 0.01-3.0 wt %, the balance being tin (Sn).

Abstract: A fire extinguishing apparatus can quickly extinguish a fire in the early stages by ejecting a pressurized liquid in the form of a fine spray, and can effectively extinguish a fire even when an extensive fire occurs. The apparatus has a frame, a cap member assembled into the upper portion of the frame, and a spraying nozzle assembly coupled to the underside of the frame. The spraying nozzle assembly has a plurality of nozzle sections. The nozzle section includes a hollow nozzle body, a swirler accommodated in the hollow nozzle body in order to apply centrifugal force to the highly pressurized liquid passing therethrough, a swirler holder which is inserted in the upper portion of hollow nozzle body and contacts with the upper surface of the swirler so as to prevent the swirler from moving, and a nozzle tip having an orifice for spraying the pressurized liquid to the fire. The nozzle tip is inserted in the lower portion of the hollow nozzle body.

Abstract: A two-stage speed change mechanism for a swash plate hydraulic motor, in which a swash plate is moved even during the revolution of the swash type hydraulic motor, thereby making it possible to vary the exclusion volume. An accommodating bore for accommodating a fixing pin is formed on a side wall of a housing. Piston for shifting the swash plate is provided, and control valves 14,15 and 16 each including a pilot line 14, a spool 15 and a compression spring 16 are installed for the actuation of the swash plate shifting piston 3. Thus the exclusion volume can be safely varied even during the rotating of the hydraulic motor.

Abstract: A variable displacement mechanism for a swash plate hydraulic pump or motor, in which a swash plate, a swash plate guiding wall, a tilting control piston, and a swash plate tilting guiding and swash plate rotation preventing pin are included for varying the requiring flow rate (volumetric displacement) per revolution without the rotation of the swash plate even during the tilting of the swash plate angle and during the rotation of the hydraulic pump or motor. The periphery of the swash plate is spherical for smoothing the tilting of the swash plate, and a securing pin accommodating slot is formed on the lower portion of the swash plate. Further, there are provided a securing pin for preventing rotation of the swash plate, and a bore formed on the bottom of a front cover for installing the securing pin.

Abstract: A method for improving the tip and nozzle of a gas welder in which a conventional or new surface oxidation chemical treatment was applied to improve the surface properties of the tip and nozzle of a gas welder made of copper or copper alloys. Continuous welding operation could then be possible for extended periods of time. If a black copper oxide layer is formed by chemical conversion coating treatment on the surface of the nozzle which is made of copper or copper alloys, then the splatters do not easily stick to the surface. Further, even if the splatters stick, they are more easily removed. In the case of the tip, a black copper oxide layer formed by chemical conversion coating treatment in the small hole of the tip makes the supply of the filler metal wire flow smoothly without troubles. Further, the black copper oxide layer formed by chemical conversion coating treatment also inhibits the sticking of splatters, so that the supply of the filler metal wire is smooth.

Abstract: A tool steel powder added with a vanadium carbide powder by a milling process, and a method for manufacturing parts therewith are disclosed. Particularly, a method for adding a vanadium carbide (VC) powder to a tool steel powder by a ball milling or an attrition milling, and a method for manufacturing a part by using the milled tool steel powder are disclosed. The method for manufacturing a vanadium carbide added tool steel powder and for manufacturing parts using the powder, includes the steps of: mixing a tool steel powder with vanadium carbide powder in an amount of 5.about.15 wt %; ball-milling the mixture powder under wet atmosphere; carrying out an annealing in a vacuum; carrying out a cold die compaction or cold isostatic pressing to near net dimension and carrying out a vacuum sintering and then a hot isotropic pressing without canning.

Abstract: A vibration isolator for lateral and axial isolation, as the case may be, of vibrations between inner and outer elements, such elements having a space therebetween with leaf spring packs and hydraulic fluid therein and hydraulic fluid passages for moving hydraulic fluid opposite sides of such leaf spring packs for dampening vibration between such elements.

Abstract: This invention relates to a scavenging shroud mechanism for improving scavenging of a 2-stroke engine, and more particularly to a scavenging shroud mechanism for improving scavenging of a 2-stroke engine which is constructed such that a scavenging shroud mechanism is provided to a scavenging valve whereby compressed air sucked into an interior of a combustion chamber makes a tumble phenomenon along with cylinder wall surface and thereby pushes out already burned burnt gas and simultaneously is capable of efficiently feeding new air so that efficient reverse loop scavenging system is made. The scavenging shroud mechanism has a baffle 2, shroud guide notch 3 and a shroud neck 4, and a fixed supporting pin 6 and a supporting guide 5 provided on the inner side of the intake manifold 9. A shroud guide notch 3 is provided in the baffle 2 so as to permit the scavenging shroud mechanism 1 to up and down-ward movement but not right and left rotational movement.

Abstract: The autoclave cure process is the representative composite fabrication technique for high quality composite materials for the aerospace and defense industry application. After lay up and vacuum-bagging in a complicated sequence, the several composite material needed in autoclave curing are cured under controlled temperature and pressure. The autoclave curing, in which the total cure process requires at least 4-6 hours, is a very expensive process. Therefore, the determination of an optimal cure process for composite prepregs is very important for guaranteed quality as well as being important economically. Theoretical models cannot be proved because of the lack of experimental methods. The experimenter must run many batches of autoclave curing trial and error at the different curing temperatures and pressures to obtain a sufficient amount of data which can experimentally determine the optimal cure process.