Abstract: A bidirectional driving mechanism 10 has a drive-side linkage rod 11, a driven-side linkage rod 13, two levers 12 that link the drive-side linkage rod with the driven-side linkage rod, and a guide 14 that regulates the operation of the drive-side linkage rod 11 and the driven-side linkage rod 13. A moveable pin 18 is passed through a first groove cam 16 of the drive-side linkage rod 11, a second groove cam 17 of the guide 14, and third groove cams 19 of the levers 12, and by operation of the drive-side rod 13, the moveable pin 18 moves within the respective groove cams 16, 17, 19, causing the levers 12 to rotate, the driven-side linkage rod 13 to be driven in a direction opposite to the drive-side linkage rod 11, and a driven-side arc electrode 5 to be driven in a direction opposite to a drive-side arc electrode 4.

Abstract: A method for controlling a power switching apparatus to solve problems including: setting a target time reaching a predetermined position immediately before a target phase by a time calculator during an opening and closing operation of a movable arc contact with respect to a fixed arc contact in a target phase at a predetermined average switching speed; and controlling an electric motor at a speed equal to or less than an average switching speed immediately before the target phase from an operation start time to the target time by a motor controller.

Abstract: The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.

Abstract: A bidirectional driving mechanism 10 has a drive-side linkage rod 11, a driven-side linkage rod 13, two levers 12 that link the drive-side linkage rod with the driven-side linkage rod, and a guide 14 that regulates the operation of the drive-side linkage rod 11 and the driven-side linkage rod 13. A moveable pin 18 is passed through a first groove cam 16 of the drive-side linkage rod 11, a second groove cam 17 of the guide 14, and third groove cams 19 of the levers 12, and by operation of the drive-side rod 13, the moveable pin 18 moves within the respective groove cams 16, 17, 19, causing the levers 12 to rotate, the driven-side linkage rod 13 to be driven in a direction opposite to the drive-side linkage rod 11, and a driven-side arc electrode 5 to be driven in a direction opposite to a drive-side arc electrode 4.

Abstract: A gas circuit breaker includes a driving side electrode having a driving side main contact and a driving side arc contact, and a driven side electrode having a driven side main contact and a driven side arc contact in a sealed tank. The driving side electrode is connected to an operation device. The driven side electrode is coupled to a bidirectional driving mechanism unit. A sliding guide, on which the driven side main contact slides, is provided on an inner periphery side of the driven side main contact. The driven side main contact is energized by a coil spring in a direction of the sliding guide and has two contact surfaces. Only during normal conduction, one of the contact surfaces contacts a projected portion of the sliding guide and the other of the contact surfaces contacts the driving side main contact.

Abstract: Provided is a gas circuit breaker that can reduce control energy smaller than that in previous double motion systems and an excessive force applied to a moveable pin to achieve a highly reliable double motion system. A gas circuit breaker has a double motion mechanism unit including a driving-side connecting rod, a driven-side connecting rod, a lever to connect the rods, and a guide to define the motion of the driving-side and driven-side connecting rods. A moveable pin extends through a first grooved cam of the driving-side conencting rod, a second grooved cam of the guide, and a third grooved cam of the lever. The driving-side connecting rod operates to move the moveable pin inside the grooved cams. Thus, the lever is rotated, the driven-side connecting rod is driven opposite to the driving-side connecting rod, and the driven-side arcing contact is driven opposite to the driving-side arcing contact.

Abstract: A gas circuit breaker includes a driving side electrode having a driving side main contact and a driving side arc contact, and a driven side electrode having a driven side main contact and a driven side arc contact in a sealed tank. The driving side electrode is connected to an operation device. The driven side electrode is coupled to a bidirectional driving mechanism unit. A sliding guide, on which the driven side main contact slides, is provided on an inner periphery side of the driven side main contact. The driven side main contact is energized by a coil spring in a direction of the sliding guide and has two contact surfaces. Only during normal conduction, one of the contact surfaces contacts a projected portion of the sliding guide and the other of the contact surfaces contacts the driving side main contact.

Abstract: A method for controlling a power switching apparatus to solve problems including: setting a target time reaching a predetermined position immediately before a target phase by a time calculator during an opening and closing operation of a movable arc contact with respect to a fixed arc contact in a target phase at a predetermined average switching speed; and controlling an electric motor at a speed equal to or less than an average switching speed immediately before the target phase from an operation start time to the target time by a motor controller.

Abstract: Provided is a gas circuit breaker that can reduce control energy smaller than that in previous double motion systems and an excessive force applied to a moveable pin to achieve a highly reliable double motion system. A gas circuit breaker has a double motion mechanism unit including a driving-side connecting rod, a driven-side connecting rod, a lever to connect the rods, and a guide to define the motion of the driving-side and driven-side connecting rods. A moveable pin extends through a first grooved cam of the driving-side conencting rod, a second grooved cam of the guide, and a third grooved cam of the lever. The driving-side connecting rod operates to move the moveable pin inside the grooved cams. Thus, the lever is rotated, the driven-side connecting rod is driven opposite to the driving-side connecting rod, and the driven-side arcing contact is driven opposite to the driving-side arcing contact.

Abstract: An object is to provide a gas circuit breaker having improved reliability. To solve the above-described problem, a gas circuit breaker is characterized by having a fixed contact, a movable contact configured to come into contact with or separate from the fixed contact, an insulating enclosure internally having the fixed contact and the movable contact, the inside of the insulating enclosure being filled with an insulating gas, and an operating mechanism configured to allow drive force for movement of the movable contact to be generated, wherein the operating mechanism includes a mover including permanent magnets or magnetic bodies disposed in a direction along which the operating mechanism allows the drive force to be generated, and a magnetic pole disposed to be opposed to the mover, and having a winding.

Abstract: The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.

Abstract: A linear motor armature according to an embodiment includes an armature coil and a cooling jacket. The cooling jacket is provided to surround the armature coil and has an internal space into which a refrigerant is supplied. The cooling jacket is formed in a thin plate shape having a structure in which a channel for supplying the refrigerant is provided in a multiple manner in its thickness direction.

Abstract: An electromagnetic contactor includes a fixed core into which a bobbin of an electromagnetic coil is inserted and fitted, a movable core, a movable insulating base, a retracting spring, a fixed insulating base, and a supporting mechanism. The supporting mechanism is inserted into a through-hole formed in a thickness direction of the fixed core, and is configured in such a manner that a buffer spring is arranged between both ends of a supporting member that is arranged so as to protrude from the through-hole and a lower surface of the coil bobbin. An elastic member is provided between the fixed insulating base and a lower surface of the fixed core.

Abstract: A linear motor armature according to an embodiment includes an armature coil and a cooling jacket. The cooling jacket is provided to surround the armature coil and has an internal space into which a refrigerant is supplied. The cooling jacket is formed in a thin plate shape having a structure in which a channel for supplying the refrigerant is provided in a multiple manner in its thickness direction.

Abstract: The present invention is to provide an electromagnetic contactor in which the collision velocity of both of a movable core and a fixed core is effectively reduced to improve mechanical endurance of an electromagnet. The combined load of a buffer spring before actuation is set smaller than that of a retracting spring and a contact spring in a conduction state, so that the fixed core is actively moved towards the movable core side when being actuated by an electromagnetic coil, and a relative collision velocity can be accordingly decreased, thus improving mechanical endurance of the movable core and the fixed core.

Abstract: A water based ink composition for a writing instrument comprising at least a colorant, water and a liquid medium, wherein reduced maltooligosaccharide and/or reduced isomaltooligosaccharide are added in a proportion of 0.5 to 20% by weight based on the total amount of the ink composition.

Abstract: The present invention relates to an ink follower for a water-base ballpoint pen, which has strong pseudoplasticity by causing HO(C2H4O)m.(C3H6O)nH to interfere with hydrophobic silica which is likely to disperse stably in silicone oil. Moreover, this ink follower for a water-base ballpoint pen keeps its stable performance of little long-term change of its viscosity. In order to improve long-term stability of the water-base ballpoint pen using this ink follower, the ink follower is made to comprise silicone oil, hydrophobic silica and HO(C2H4O)m.(C3H6O)nH (in which each of m and n shows 0 or a positive integer, provided that m+n is not equal to 0).

Abstract: Dispersibility of thickener is constant for every lot and viscosity difference is little. Fine bubbles existing in the thicker in ink follower are removed. A step of homogenizing the thickener at any temperature within a range of 40° C. to 130° C. is included. Preferably, a step of homogenizing the thickener at any temperature within a range of 100° C. to 130° C. is included.

Abstract: This invention relates to ink follower for a water-base ballpoint pen with its bubbles removed, time-dependent stability, less oil separation, and greatly reduced lot-to-lot viscosity difference and associated performance difference, and a method for manufacturing the same. After addition of thickener, the follower is made depressurized preferably at 0.2 atm or lower. Simultaneous heating and stirring are preferable. When the ink follower is solely debubbled in advance, fine bubbles contained in particulate silica, clay thickener, etc. can be very highly removed even if the centrifugal debubbling is not so strong and there is no bad affection to the writing property of the pen. It is also possible that, after adding the thickener, a centrifugal force greater than or equal to 200-fold of the gravitational acceleration is applied to debubble.

Abstract: Lot-to-lot or time-dependent instability in quality of the known ink follower for water-base ballpoint pens is overcome. Particulate silica, or organic-treated clay is kneaded as thickener with base oil to prepare gel matter. The gel matter is pressurized to eliminate fine bubbles to yield ink follower for water-base ballpoint pens. The pressurization is preferably performed at 2 atm or higher. The elimination of the bubbles is more effective when the ink follower is, under pressurization, stirred and/or heated.