Abstract: A high-frequency induction hardening apparatus used for metal objects, including a heating coil holder (4) carrying a heating coil (40) for hardening a metal object (2), an eccentric rotor assemble housing a cam mechanism for allowing the heating coil to eccentrically rotate through the heating coil holder (4); and a pair of supporters (11), (12) for keeping the heating coil holder (4) in a desired position, the supporters (11), (12) limiting the movement of the heating coil holder (4) to a plane intersecting the axis (21) of the cam carried in an eccentric rotor mount (13).

Abstract: A high-frequency induction hardening apparatus used for metal objects, including a heating coil holder (4) carrying a heating coil (40) for hardening a metal object (2), an eccentric rotor assemble housing a cam mechanism for allowing the heating coil to eccentrically rotate through the heating coil holder (4); and a pair of supporters (11), (12) for keeping the heating coil holder (4) in a desired position, the supporters (11), (12) limiting the movement of the heating coil holder (4) to a plane intersecting the axis (21) of the cam carried in an eccentric rotor mount (13).

Abstract: The present invention provides a thermal insulation coating material for a carbon-containing refractory that prevents surface oxidation of the carbon-containing refractory and that can form a thermal insulation layer when heated at a high temperature. The thermal insulation coating material for a carbon-containing refractory according to the present invention is characterized by including a refractory material containing hollow refractory particles whose content is 50 to 97% by weight and a part or the whole of the balance being clay with the content of the clay being 30% by weight or less and a liquid binder added to the refractory material in an amount of 20 to 170% by weight in outer percentage.

Abstract: A refractory block for continuous casting comprising: a unitary assembly comprising: a plate brick having a top, a bottom, sides and a passageway therethrough, and a submerged nozzle having a top, a bottom, sides and a passageway therethrough, the sides of the submerged nozzle having a shoulder portion, the bottom of the plate brick joining the top of the submerged nozzle; a metal casing surrounding the unitary assembly such that the metal casing surrounds and supports a portion of the sides of the plate brick, a portion of the bottom of the plate brick and a portion of the sides of the submerged nozzle including the shoulder portion, and an air cooling jacket surrounding the metal casing.

Abstract: In an air flow rate control apparatus having an idle revolution speed control apparatus, in order to prevent the measuring part from freezing by water drops in the idle revolution speed control apparatus, and in order to layout an engine room easily and freely, a perpendicular cavity 9 of cylinder type is formed in a base part 2B of a throttle body 2, in which a bottom part of the cavity 9 is closed by a seal plug 7 and an upper part of the cavity 9 is led to a boa 3 of a cylinder portion 2A, and a bottom par of the perpendicular cavity 9 is arranged lower than a bottom end of aperture part 10 of an air passage and a water pool portion 9B is formed thereunder. Furthermore, a passage section lower part of an air-outlet passage 22a, 22b of a ISC valve 5 is arranged lower than the measuring part 39a, 39b of the bottom end.

Abstract: A refractory block for continuous casting is disclosed comprising a unitary assembly including a plate brick having a top, bottom, sides and a passageway therethrough; a gas permeable porous brick having a top, bottom, sides and a passageway therethrough, where the top of the porous brick is attached to the bottom of the plate brick, a gas pool for containing gas surrounds the sides of the porous brick, and a submerged nozzle having a top, bottom and sides, where the sides have shoulder portions, has the top of the submerged nozzle attached to the bottom of the porous brick. A metal casing surrounds the unitary assembly so that the metal casing surrounds and supports a portion of the sides of the plate brick, a portion of the bottom of the plate brick, the sides of porous brick, and a portion of the sides of the submerged nozzle, including the shoulder portions. The metal casing further includes gas feed and discharge pipes therethrough in communication with the gas pool.

Abstract: A carbon-containing refractory is formed by mixing 1-10 weight % of silicon nitride, 1-35 weight % of carbon, and a remainder of a refractory raw material, molding the mixture into a molded body, and burning the molded body such that fine whiskers of silicon carbide are uniformly distributed within the matrix.

Abstract: A carbon containing refractory comprising, by weight: 5 to 60% of AZT clinker mainly constituted by ZrO.sub.2, Al.sub.2 O.sub.3, TiO.sub.2 and SiO.sub.2 ; 3 to 40% of a carbon source; and the balance being at least one or two refractories selected from a group consisting of alumina, magnesia, zirconia, mullite, spinel, calcia, and fused quartz.

Abstract: Disclosed herein is a porous nozzle which is made up of an upper porous brick, a dense brick, and a lower porous brick arranged vertically in layer and a casing surrounding them. The casing is provided with an inert gas supply pipe which leads to the peripheral space of the upper porous brick. The casing is also provided with another inert gas supply pipe which leads to the peripheral space of the lower porous brick.Disclosed also herein is another porous nozzle which is made up of an upper porous brick, a dense brick, and a lower porous brick arranged vertically in layer and a casing surrounding them. The casing is provided with an inert gas supply pipe which leads to the peripheral space of the lower porous brick which communicates with the peripheral space of the upper porous brick.