Abstract: A power plug with overloaded display providing users with a function of a warning display for protecting the power plug from over-heated melting and from shorting and catching on fire. The plug includes an embedded positioned block arranged on a periphery of electric metal-pins of the power plug, and a thermochromic film is coated on the surface of the embedded positioned block, and warning characters are printed on the embedded positioned block. The external body of the power plug is made by injection modeling with mixed transparent PVC and thermochromic materials, or the embedded positioned block may be directly injected with thermochromic materials, or connected with a detecting transistor linked by a light emitting diode (LED). When the power plug is over-heated and the temperature of the power plug generally increases, the thermochromic materials or the LED will display a warning message.

Abstract: The present invention discloses an automatic water pressure control valve balancing the temperature of mixed water, eliminating a cylinder enclosing the pressure control piston and multiple seal rings, to reduce the number of parts and to minimize the production costs of the automatic water pressure control valve, and a second automatic water pressure control valve simplifying the structure of the piston within the cylinder to enhance productivity of the automatic water pressure control valve, and comprising additionally the backflow cutoff valves in each of the hot water outlet and the cold water outlet to prevent back flows of water. Therefore, initial control of water pressure is easy because the piston is always placed in the center of the cylinder while water doesn't flow.

Abstract: Disclosed is a method for manufacturing a disintegrative core for use in high pressure casting. The disintegrative core can be applied where a light metal such as an aluminum alloy or magnesium alloy is subjected to high pressure casting, such as die casting or squeeze casting and is manufactured from a water-soluble salt which is high in latent heat and ranges, in melting point, from 280 to 520° C. and, in heat transfer coefficient (&kgr;), from 9.8×10−2 to 1.2×10 W/m·° C. The water-soluble salt, alone or in combination with a fine hard powder, is melted and solidified in a core mold. Alternatively, the melt is processed into a fine powder which is then molded in a core mold. The method can be applied for the manufacture of complex shapes of cores. Also, disclosed is a method for extracting such a core from a high pressure molded product.

Abstract: A water hammer cleaning machine has a cleaning liquid supply piping line with a pump to press cleaning liquid therethrough and an air piping line with compressor to press air therethrough to a piping line to be cleaned. An automatic opening-closing valve on the air piping line opens or closes the air piping line to clean alien substances inside of the piping line with the cleaning liquid and with a shock wave of resulting oscillation.

Abstract: A water hammer cleaning machine has a cleaning liquid supply piping line with a pump to press cleaning liquid therethrough and an air piping line with compressor to press air therethrough to a piping line to be cleaned. An automatic opening-closing valve on the air piping line opens or closes the air piping line to clean alien substances inside of the piping line with the cleaning liquid and with a shock wave of resulting oscillation.

Abstract: A hardened skin care instrument having a file tooth portion formed by an electroplating process is disclosed. The instrument including a handle part with a recessed portion formed thereon, and a head part comprises an abrasive piece attached to the head part. The abrasive piece includes a plurality of release grooves that are produced by corroding a selected portion of a copper film laid on one surface of a base made of synthetic resin, and a plurality of file tooth portions that are formed by adhering abrasive powder to the remaining portion of the copper film by an electroplating. The release grooves and file tooth portions are arranged to cross over each other.

Abstract: A hardened skin care instrument having a file tooth portion formed by an electroplating process is disclosed. The instrument including a handle part with a recessed portion formed thereon, and a head part comprises an abrasive piece attached to the head part. The abrasive piece includes a plurality of release grooves that are produced by corroding a selected portion of a copper film laid on one surface of a base made of synthetic resin, and a plurality of file tooth portions that are formed by adhering abrasive powder to the remaining portion of the copper film by an electroplating. The release grooves and file tooth portions are arranged to cross over each other.

Abstract: A nail care instrument has abrasive portions formed by an electroplating process. The instrument comprises a base of synthetic resin, a copper film coated on one surface of the base and having a plurality of release recesses formed by corroding selected portions of the copper film. The abrasive portions formed on non-corroded portions of the copper film, wherein the abrasive portions are formed by electroplating an abrasive substance on the non-corroded portions of the copper film in a solution containing white alumina or the abrasive powder.