Abstract: A method for assembling an arc-extinguishing chamber of an electromagnetic contactor includes a step of fixing a pair of fixed contacts each including a support conductor and a C-shaped part, to a bottom plate part of the arc-extinguishing chamber having a tub-shape with one end being open, the C-shaped part defining inside of the arc-extinguishing chamber; a step of installing an insulation cover covering a part other than a contact point part of each C-shaped part of the pair of fixed contacts; and a step of disposing a movable contact to be capable of contacting to and separating from the contact point parts of the fixed contacts.

Abstract: An electromagnetic contactor includes a contact device having a contact housing case formed from an insulating material and housing a pair of fixed contacts and a movable contact disposed to be capable of contacting to and separating from the pair of fixed contacts. On an inner peripheral surface of the contact housing case along the movable contact, arc extinguishing permanent magnets magnetized so that magnetic pole faces facing each other have same polarity are disposed to be near the movable contact.

Abstract: A contact mechanism where a shape of at least one of a fixed contactor including a pair of fixed contact portions and a movable contactor including a pair of movable contact portions capable of contacting with and separating from the pair of fixed contact portions is set to a shape that generates a Lorentz force resisting electromagnetic repulsion in a contactor opening direction generated between the fixed contact portions and the movable contact portions when a current is applied, has the fixed contactor and the movable contactor being inserted in a current path. Magnetic bodies are disposed on at least one of the fixed contactor and the movable contactor for suppressing a force driving arcs, which are generated between the pair of fixed contact portions and the pair of movable contact portions, to the fixed contactor on the opposite side.

Abstract: An electromagnetic contactor has a pair of fixed contacts; a movable contact disposed to be capable of contacting with and separating from the pair of fixed contacts; and an electromagnetic unit driving the movable contact. The electromagnetic unit has a magnetic yoke having an open upper part; an upper magnetic yoke cross-linked in the open upper part of the magnetic yoke; a spool having a central opening in which an exciting coil is wound around the spool; a movable plunger movably disposed in the central opening of the spool in an axial direction and having a tip end protruding, the movable plunger urged by a return spring; and an auxiliary yoke forming a magnetic path between the movable plunger and the U-shaped magnetic yoke when the movable plunger is in an open position. The movable plunger is coupled to the movable contact through a coupling shaft.

Abstract: An electromagnetic contactor has a pair of fixed contacts disposed and fixed maintaining a predetermined interval; a movable contact disposed to be capable of contacting to and separating from the pair of fixed contacts; an electromagnet unit to drive the movable contact; and a drive circuit driving the electromagnet unit. The electromagnet unit includes at least a movable plunger urged by a return spring, a coil to move the movable plunger, and a ring-form permanent magnet magnetized in a moving direction of the movable plunger. The drive circuit includes a power source to supply power to the coil; a pulse drive circuit to output and supply to the coil an engage pulse causing the movable plunger to perform an attracting operation and a hold pulse maintaining the attracting operation when the movable plunger is subject to the attracting operation, and a flywheel circuit having a semiconductor switching element.

Abstract: An electromagnetic switch has a contact device having a pair of fixed contacts fixed thereof and maintaining a predetermined interval inside an arc-extinguishing chamber receptacle, and a movable contact disposed to be connectable with the pair of fixed contacts; and an electromagnetic device driving the movable contact. The electromagnetic device has a cylindrical exciting coil, a fixed core passing through center of the exciting coil, a magnetic yoke covering an outer side of the exciting coil, and a movable core facing the fixed core and the magnetic yoke, and armature surfaces of the fixed core and the magnetic yoke are formed on a side of the contact device than the exciting coil.

Abstract: An electromagnetic contact device has a terminal base (18) formed on one end of a coil frame around which a winding of an electromagnetic coil is wound; a terminal (20a) which can be connected to external wiring, and a winding wire binding portion (20e) which can bind an end portion of the winding, wound around the coil frame to establish connection. The coil terminal (20) is a component formed by integrating the terminal (20a), the winding wire binding portion (20e), and a portion to be engaged (20b). This coil terminal (20) is mounted by press-fitting a press-fit engaging portion (18b), which is formed in the terminal base (18), in the portion to be engaged (20b) to establish engagement.

Abstract: An electromagnetic contactor has a contact device having a pair of fixed contacts and a movable contact; and an electromagnet unit including an exciting coil driving a movable plunger connected through a connecting shaft. The contact device is configured such that L-shaped portions have a contact portion formed in the pair of fixed contacts fixed maintaining a predetermined interval, and two ends of the movable contact are disposed to be capable of contacting to and separating from the contact portions of the L-shaped portion on a side opposite to that of the electromagnet unit. The electromagnet unit includes a magnetic yoke enclosing a plunger drive portion, a movable plunger having a leading end protruding through an aperture formed in the magnetic yoke and urged by a return spring, and a ring-form permanent magnet magnetized in a movable direction of the movable plunger and fixed to enclose a peripheral flange portion.

Abstract: A reversible unit (20) has a pair of interlock plates (21, 22) detachably connected to operation indication pieces (4a, 4b) of a pair of electromagnetic contactors (1a, 1b) and moving in the same direction as the moving direction of the operation indication pieces, a lock piece (23) connecting with the pair of interlock plates (21, 22), a first normally-closed contact (24), and a second normally-closed contact (25). In a closing operation of one of the electromagnetic contactors (1a), the lock piece (23) moves one of the interlock plates (21) and prohibits the movement of the other interlock plate (22). The first normally-closed contact (24) is connected in series in a power supply circuit to an exciting coil (6b) of the other electromagnetic contactor (1b). One of the interlock plates (21) has a first opening operation engagement portion (34) releasing the first normally-closed contact (24) when the interlock plate (21) moves.

Abstract: An electromagnetic contactor has a contact device including a pair of fixed contacts disposed to maintain a predetermined distance and a movable contact disposed to be capable of contacting to and separating from the pair of fixed contacts. An insulating cover covering all except a contact portion contacting with the movable contact is mounted on the pair of fixed contacts.

Abstract: An electromagnetic contactor has a contact device having a contact housing case housing a pair of fixed contacts and a movable contact disposed to be capable of contacting to and separating from the pair of fixed contacts, and an insulating cylinder in a bottomed tubular shape disposed on an inner peripheral surface of the contact housing case to enclose the pair of fixed contacts and the movable contact. The insulating cylinder positions an arc extinguishing permanent magnet for extinguishing an arc generated between the pair of fixed contacts and the movable contact. A magnet housing portion to protect the arc extinguishing permanent magnet from the arc is formed on an inner peripheral surface of the insulating cylinder and faces a side surface of the movable contact. An arc extinguishing space is formed on an outer side of the magnet housing portion in an extending direction of the movable contact.

Abstract: A mounting unit for an electromagnetic contactor can prevent erroneous mounting of a non-mountable unit in a state in which a mountable unit is mounted on a case-side mounting portion, and a connection structure of an electromagnetic contactor uses the mounting unit. A mounting unit (3) for an electromagnetic contactor can be mounted on electromagnetic contactors (2a, 2b) having on a unit attaching portion (6b) a contactor-side mounting preventing portion (6f) that prevents mounting by engagement when a non-mountable unit, which cannot be mounted, is mounted. In the mounting unit (3), a unit main body (39) is provided with a mounting preventing transfer member (51) that forms a unit-side mounting preventing portion (54) that engages with a contactor-side mounting preventing portion (6f) when mounted on the electromagnetic contactors (2a, 2b) and prevents mounting of the non-mountable unit on a unit mounting portion (3g) onto which the non-mountable units (5a, 5b) are mounted.

Abstract: An extinction cover (5) is mounted on a case (4) thereby sealing an extinction chamber (S). This extinction cover has an engaging-force-increased portion (5c1) which strengthens the force of engagement with the case, and an engaging-force-decreased portion (5c2) which weakens the force of engagement with the case. In response to an increase in internal pressure in the extinction chamber due to arc gas generation, the engaging-force-decreased portion establishes disengagement of the case and provides a gap (27) with the case, for linking the extinction chamber to external air, and the engaging-force-increased portion maintains engagement with the case.

Abstract: Provided are a fluid conveying tube and a fluid leakage detecting system which can convey a cryogenic fluid such as LNG and which can quickly and reliably detect leakage of the fluid within the tube and the position of the leakage. An optical fiber is continuously wound over the entire length of a flexible tube. Leakage information detected by an optical fiber temperature sensor is transmitted via a terminal to an externally provided temperature measurement device. Meanwhile, when similar leakage occurs in the vicinity of a coupling section, the gas pressure inside the heat insulating layer or the like increases due to the pressure of LNG within a corrugated tube or a pressure generated as a result of evaporation of LNG. When the pressure inside the heat insulating layer increases, information representing a change in the gas pressure is transmitted to a terminal via a hollow pipe. A tube or the like is externally connected to the terminal, and is connected to a pressure meter or like.

Abstract: A reversible unit (10) is attached by being mounted over a pair of adjacently disposed electromagnetic contactors (1a) and (1b). The reversible unit (10) includes a pair of interlock plates (11) and (12), a lock piece (13), and a unit case (10b) accommodating the pair of interlock plates (11) and (12) and the lock piece (13). The lock piece (13) rotates in a first direction with the movement of one of the interlock plates (12) in a turn-on operation of one of the electromagnetic contactors (1a) to prevent the movement of the other interlock plate (11), and rotates in a second direction different from the first direction with the movement of the other interlock plate (11) in a turn-on operation of the other electromagnetic contactor (1b) to prevent the movement of one of the interlock plates (12). The unit case (10b) is provided with a lock piece display window (10g) which allows determination of the rotation of the lock piece (13) in the first direction or the second direction.

Abstract: A polarized electromagnet has a spool around which an exciting coil is wound; a movable plunger penetrating the spool; an interior yoke fixed on an outer side of the spool; an exterior yoke disposed to maintain a predetermined interval on an outer side of the interior yoke; and a permanent magnet disposed between the interior yoke and exterior yoke. The exterior yoke has a pair of end plate portions opposing two ends of the spool, and a linking plate portion linking the pair of end plate portions. The interior yoke has a first opposing plate portion opposing the linking plate portion of the exterior yoke, and second opposing plate portions opposing one end plate portion of the exterior yoke, and the first opposing plate portion and the second opposing plate portion are linked without coming close to the exterior yoke.

Abstract: Provided is an electromagnetic contactor (20) which transmits an attraction movement of a movable core (8d) of an electromagnet (8), via a drive lever (9), to a movable contact support (7a) that is movable in parallel with the movable core (8d), wherein an urging portion (21) for applying an urging force to the movable core (8d) is provided such that the movable core (8d) is held at a movable core initial position which is apart from a fixed core (8c) and does not allow engagement with the movable contact support (7a).

Abstract: A contact device includes a pair of fixed contactors fixed to one side of an insulation container with a predetermined space therebetween and having a columnar shape with a tip end contact surface protruding at lease inside the insulation container, and a movable contactor disposed to be capable of contacting with and separating from the pair of fixed contactors. Surfaces of the pair of fixed contactors facing the movable contactor are formed of annular peripheral walls having a concave part at a center thereof. An annular arc is formed between the annular peripheral wall and the movable contactor when the contact device is in an open state.

Abstract: A contact mechanism includes a fixed contact and a movable contact adapted to be inserted in a conducting path. The fixed contact includes a pair of flat plate conductive bodies disposed and fixed to maintain a predetermined interval. The movable contact includes a flat plate conductive body disposed to face the pair of flat plate conductive bodies of the fixed contact and capable of contacting with and separating from the pair of flat plate conductive bodies. Current paths wherein each of the current paths has a current flowing in a same direction are formed at least two side portions of the flat plate conductive bodies of the fixed contact and movable contact mutually facing each other in a width direction.