Abstract: A contact-breaker device that can be miniaturized, realize low power consumption and low cost, and generate an irregular pulse current by causing irregular electrical conduction and insulation of a circuit. The contact-breaker device comprises: fixed terminals 12A and 12B secured at positions spaced apart from each other; and a movable member 11 capable of moving relative to the fixed terminals 12A and 12B and coming into or avoiding contact with the fixed terminals 12A and 12B based on its movement, thereby causing electrical conduction or insulation between the fixed terminals 12A and 12B; wherein the movable member 11 irregularly moves in accordance with externally applied vibration, thereby causing irregular electrical conduction or insulation between the fixed terminals 12A and 12B.

Abstract: A contact-breaker device that can be miniaturized, realize low power consumption and low cost, and generate an irregular pulse current by causing irregular electrical conduction and insulation of a circuit. The contact-breaker device comprises: fixed terminals 12A and 12B secured at positions spaced apart from each other; and a movable member 11 capable of moving relative to the fixed terminals 12A and 12B and coming into or avoiding contact with the fixed terminals 12A and 12B based on its movement, thereby causing electrical conduction or insulation between the fixed terminals 12A and 12B; wherein the movable member 11 irregularly moves in accordance with externally applied vibration, thereby causing irregular electrical conduction or insulation between the fixed terminals 12A and 12B.

Abstract: A resistance welding electrode for supplying a current to metal workpieces to weld the workpieces to each other includes an electrode body as an electrode matrix of a copper alloy and a plurality of filamentary members embedded in the electrode matrix parallel to the direction in which a current flows therethrough. The filamentary members have respective tip ends exposed as lands on a surface of a tip end of the electrode body. The filamentary members are made of a material having an electric conductivity different from that of the electrode matrix. The exposed tip ends of the filamentary members having a total area which is in the range of 0.5 to 40% of the entire area of the tip end of the electrode body.

Abstract: A method of producing a molded ceramic article comprises the first step mixing powdery raw materials and a liquid additive, thereby obtaining a mixed raw material, the second step press-molding the mixed raw material obtained in the first step in a hydrostatically applied condition of pressure, thereby removing an excess of the liquid additive to obtain a preform, and the third step calcining the preform obtained in the second step to obtain a molded ceramic article. The molded ceramic article comprises, as a principal component, copper and, as essential components, Cr and Ni within composition ranges of 0.1.ltoreq.Cr<2 wt. % and 0.1.ltoreq.Ni<10 wt. % and further at least one additive component selected from the group consisting of the following composition ratios: the following composition ratios: 0<Fe<5 wt. %, 0.ltoreq.Co<5 wt. %, 0.ltoreq.Al<10 wt. %, 0.ltoreq.Ti<20 wt. %, 0.ltoreq.Mo<3 wt. %, 0.ltoreq.Si<3 wt. %, 0.ltoreq.V<3 wt. %, 0.ltoreq.Mg<1 wt. %, and 0.ltoreq.

Abstract: A method of producing a molded ceramic article comprises the first step mixing powdery raw materials and a liquid additive, thereby obtaining a mixed raw material, the second step press-molding the mixed raw material obtained in the first step in a hydrostatically applied condition of pressure, thereby removing an excess of the liquid additive to obtain a preform, and the third step calcining the preform obtained in the second step to obtain a molded ceramic article. The molded ceramic article comprises, as a principal component, copper and, as essential components, Cr and Ni within composition ranges of 0.1.ltoreq.Cr<2 wt. % and 0.1.ltoreq.Ni<10 wt. % and further at least one additive component selected from the group consisting of the following composition ratios: the following composition ratios: 0<Fe<5 wt. %, 0.ltoreq.Co<5 wt. %, 0.ltoreq.Al<10 wt. % 0.ltoreq.Ti<20 wt. %, 0.ltoreq.Mo<3 wt. %, 0.ltoreq.Si<3 wt. % 0.ltoreq.V<3 wt. % 0.ltoreq.Mg<1 wt. % and 0.ltoreq.

Abstract: A method of producing a molded ceramic article comprises the first step mixing powdery raw materials and a liquid additive, thereby obtaining a mixed raw material, the second step press-molding the mixed raw material obtained in the first step in a hydrostatically applied condition of pressure, thereby removing an excess of the liquid additive to obtain a preform, and the third step calcining the preform obtained in the second step to obtain a molded ceramic article. The molded ceramic article comprises, as a principal component, copper and, as essential components, Cr and Ni within composition ranges of 0.1.ltoreq. Cr< 2 wt. % and 0.1.ltoreq. Ni< 10 wt. % and further at least one additive component selected from the group consisting of the following composition ratios: the following composition ratios: O<Fe< 5 wt. %, O.ltoreq.Co< 5 wt. %, O.ltoreq.Al< 10 wt. %, O.ltoreq.Ti< 20 wt. %, O.ltoreq.Mo< 3 wt. %, O.ltoreq.Si< 3 wt. %, O.ltoreq.V< 3 wt. %, O.ltoreq.Mg< 1 wt. % and O.

Abstract: For resistance-welding workpieces of metal, an electrode is pressed against superposed regions of the workpieces and an electric current is supplied to the superposed regions to heat the same due to an electric resistance of the workpieces. The electrode has a body having a tip end for pressed engagement with one of the workpieces, and a matrix of tapered teeth disposed on the tip end of the body except for a center of the tip end. The teeth define recesses therebetween. One of the recesses is positioned at the center of the tip end, and the teeth are progressively higher from an outer circumferential edge of the tip end toward the center thereof.