Abstract: A heating apparatus (2) includes a high frequency power supply (3), a left conductive plate (4), a right conductive plate (5), a left heating coil (11), and a right heating coil (12). The left heating coil (11) includes a left conductor portion (21). The left conductor portion (21) faces a gear tooth (7a) of a helical gear (7) and extends in a direction orthogonal to the direction in which the gear tooth (7a) extends. The left heating coil (11) includes a focusing magnetic body (31) which focuses magnetic flux in the left conductor portion (21) and concentrates the magnetic flux on a surface of the gear tooth (7a). The left heating coil (11) includes an upper inducing magnetic body (32) which induces a part of the magnetic flux flowing in a tooth root of the gear tooth (7a) into a tooth tip of the gear tooth (7a).

Abstract: An object of the present invention is to provide a hardening method and a hardening device capable of successfully hardening a shaft and an inner wall of a hole of a work in which the hole is formed close to the shaft on a flat plate. A hardening device for hardening a shaft and an inner wall of a hole, the shaft extending vertically from a flat plate and the hole being formed adjacent to the shaft, includes a first heating coil that is a conductive body facing the shaft and a second heating coil that is a helical conductive body having at least a portion inserted into the hole, so that the first heating coil and the second heating coil heat the shaft and the inner wall of the hole respectively and simultaneously.

Abstract: An object of the present invention is to provide an induction heater and an induction heating method capable of heating by induction a work in which a gear portion and a shaft are integrated. An induction heater for a gear portion and a stepped shaft is arranged in such a manner that a first heating coil (annular coil) surrounds the gear portion and that a second heating coil (linear coil) faces the stepped shaft in an axial direction. Alternating currents of different frequencies are supplied to the first heating coil 1 and the second heating coil. Further, a part of the second heating coil is arranged so as to come opposite a boundary between the gear portion and the stepped shaft, thereby connecting a hardened pattern of the gear portion by the first heating coil and a hardened pattern of the stepped shaft by the second heating coil.

Abstract: A heat-sensitive switch includes a first terminal, a second terminal away from the first terminal, a reverse spring reversing at a set temperature and having an opening part and positioned between the first and second terminals, and a junction spring positioned between the reverse spring and the second terminal without being fixed, integrally having a junction part protrusively positioned and in contact with the first terminal via the opening part, and also having an outer peripheral part in contact with the second terminal. An electric connection between the first and second terminals is formed, and when the reverse spring reverses at the set temperature, a force is applied to the junction part of the junction spring in the direction away from the first terminal, whereby the electric connection is cut.

Abstract: A heat-sensitive switch, requiring welding of the junction spring, whereby the manufacturing and assembling can be facilitated, comprises, a first terminal, a second terminal away from the first terminal, a reverse spring reversing at a set temperature and having an opening part and positioned between the first and second terminals, and a junction spring between the reverse spring and the second terminal without fixed, integrally having a junction part protrusively positioned and in contact with the first terminal via the opening part, and also having an outer peripheral part in contact with the second terminal, whereby an electric connection between the first and second terminals is formed, and when the reverse spring reverses at the set temperature, a force is applied to the junction part of the junction spring in the direction away from the first terminal, whereby the electric connection is cut.

Abstract: A two-step switch, which may be minimized in radial direction and is suitable for PCB or FPC circuit board, has a first contact spring, having outer peripheral contacts in regular contact with first fixed contacts and having an inner contact inside the outer peripheral contacts and reversed by depressing, and a second contact spring, stacked on the first contact spring via an insulation sheet, having an outer peripheral contact in regular contact with a second fixed contact and having an inner contact inside of the outer peripheral contact and reversed by depressing. Through a first depressing, the inner contact of the first contact spring is reversed and in contact with the inner contact of the second contact spring, whereby a first electric circuit is actuated. Also through a second depressing, the inner contact of the second contact spring is reversed and in contact with the third fixed contact, whereby a second electric circuit is actuated.

Abstract: A two-step switch, which may be minimized in radial direction and is suitable for PCB or FPC circuit board, has a first contact spring, having outer peripheral contacts in regular contact with first fixed contacts and having an inner contact inside the outer peripheral contacts and reversed by depressing, and a second contact spring, stacked on the first contact spring via an insulation sheet, having an outer peripheral contact in regular contact with a second fixed contact and having an inner contact inside of the outer peripheral contact and reversed by depressing. Through a first depressing, the inner contact of the first contact spring is reversed and in contact with the inner contact of the second contact spring, whereby a first electric circuit is actuated. Also through a second depressing, the inner contact of the second contact spring is reversed and in contact with the third fixed contact, whereby a second electric circuit is actuated.

Abstract: Rotation of a plate cam arranged at almost the center position of a semi-open coil is performed by a motor, and induction heating of the periphery of the plate cam is performed by the semi-open coil during the rotation. The process results in uniform heating of the periphery of a workpiece of distorted shape. A detector of an angle of rotation to detect an angle of rotation of the plate cam and an electric power control part to control the electric power to be supplied to the semi-open coil according to the detection results of the detector of an angle of rotation, are provided so that the most outer end at the farthest position from the center of the plate cam is not excessively heated. A process is also provided.

Abstract: To arbitrarily adjust the diameter of revolution when revolving an object without being associated with rotation by a simple structure. A bearing 322a is mounted to a bottom surface of a supporting plate 310 for supporting an object. First rotation sleeve 322c is rotatably provided inside the bearing 322a. A second rotation sleeve 322d is provided inside the first rotation sleeve 322c. The second rotation sleeve 322d is rotated at a fixed position by means of a rotation driving shaft 321. An inner peripheral surface of the first rotation sleeve 322c is inclined at a certain angle in one direction with respect to the center line of rotation. An outer peripheral surface of the second rotation sleeve 322d is inclined at a certain angle in one direction in correspondence with the inner peripheral surface of the first rotation sleeve 322c.

Abstract: A dice game unit for playing games by casting a die having a magnet mounted therein and adapted to indicate a particular number of spot(s) on the top thereof after being cast onto a game board arranged to generate a magnetic field. The game unit comprises a plunger for casting a die onto a game board; a plate for recovering the die which has been cast on the game board; a die receiver for receiving the recovered die; and a conveyor for conveying the dice. This dice conveyor is comprised of a belt which is wound around rollers and rotatively driven by a motor. The belt has die holding plates mounted at plurality of places thereon. Each of the die holding plates is arranged to be opened and closed so that it may seize a die from the die receiver.

Abstract: A game machine with an automatic judging function according to the present invention is used to play a game in which a winner is determined according to predetermined rules of the game by moving pieces having their own characters across a game board, e.g., a checkerboard. The game machine includes classified pieces whose characters cannot be known by an opponent, a checkerboard with sensors for detecting the rank characters of the pieces disposed thereon, and a judging unit for automatically determining the winning piece on the basis of the rank characters of the pieces when they encounter on the game board. Accordingly, a game player can enjoy a game by inferring the rank characters and future moves of opponent's pieces.

Abstract: An automatic playing machine for playing dice games is provided that includes a plurality of dice, each of which is provided with an arrangement of one or more spots on at least one die surface. Each die is provided with a magnet mounted therein for directing the display of dice on a game board in accordance with the manner determined at random by a digital computing system. A magnetic field generating system positioned about the periphery of the game board ensures that dice cast onto the game board rest thereon in accordance with the manner selected by the computing system. A dice recovery and sorting system is provided to remove the dice from the game board and sort the dice for storage in accordance with the configuration of spot(s) thereon.