Abstract: An arc quenching device, which is highly reliable, small-sized, and inexpensive, includes: a semiconductor switch connected in parallel to a first switch which is mechanical; a constant voltage circuit configured to use a voltage which is generated between both contact points of the first switch to output a voltage which causes the semiconductor switch to turn on; and a second timer circuit configured to cause the semiconductor switch to turn off after a predetermined time has elapsed since the semiconductor switch turned on.

Abstract: An arc quenching device, which prevents a load device from displaying an unnecessary behavior during starting of a power supply, includes: a semiconductor switch connected in parallel to a first switch which is mechanical; a power supply circuit configured to use a voltage which is generated between both contact points of the first switch to output a voltage which causes the semiconductor switch to turn on; and a second switch configured to cause its open state to prevent the semiconductor switch from turning on.

Abstract: A trigger switch has a switch housing fixed inside a tool housing of an electric power tool and internally having a holder, an operation unit provided outside the switch housing and connected to the switch housing so as to be approachable to and separable from the switch housing, a fixed contact provided in the holder, and a movable contact provided so as to face the fixed contact in the holder and configured to come into contact with and separate from the fixed contact in conjunction with an approaching motion and a separating motion of the operation unit with respect to the switch housing. A vibration damping elastic body is provided integrally on an outer surface of the switch housing.

Abstract: An arc quenching device, which prevents a load device from displaying an unnecessary behavior during starting of a power supply, includes: a semiconductor switch connected in parallel to a first switch which is mechanical; a power supply circuit configured to use a voltage which is generated between both contact points of the first switch to output a voltage which causes the semiconductor switch to turn on; and a second switch configured to cause its open state to prevent the semiconductor switch from turning on.

Abstract: An arc quenching device, which is highly reliable, small-sized, and inexpensive, includes: a semiconductor switch connected in parallel to a first switch which is mechanical; a constant voltage circuit configured to use a voltage which is generated between both contact points of the first switch to output a voltage which causes the semiconductor switch to turn on; and a second timer circuit configured to cause the semiconductor switch to turn off after a predetermined time has elapsed since the semiconductor switch turned on.

Abstract: A surface layer including a base material made of a conductor and dispersed particles dispersed in the base material is formed on a surface of a fixed contact, and the dispersed particles each include a base particle that is metal oxide and a coating layer formed on an outer surface of the base particle.

Abstract: A trigger switch has a switch housing fixed inside a tool housing of an electric power tool and internally having a holder, an operation unit provided outside the switch housing and connected to the switch housing so as to be approachable to and separable from the switch housing, a fixed contact provided in the holder, and a movable contact provided so as to face the fixed contact in the holder and configured to come into contact with and separate from the fixed contact in conjunction with an approaching motion and a separating motion of the operation unit with respect to the switch housing. A vibration damping elastic body is provided integrally on an outer surface of the switch housing.

Abstract: An electric power tool has a tool housing, and a trigger switch fixed inside the tool housing. The tool housing internally has a trigger switch fixing unit configured to fix the trigger switch. The trigger switch fixing unit is provided with a vibration damping elastic body interposed between the trigger switch fixing unit and the trigger switch.

Abstract: A surface layer including a base material made of a conductor and dispersed particles dispersed in the base material is formed on a surface of a fixed contact, and the dispersed particles each include a base particle that is metal oxide and a coating layer formed on an outer surface of the base particle.

Abstract: A limit switch device is placed at an intended stop position, without the need to move the actuator additionally from the position at which the on/off state is switched. A first movable portion (211) causes a first contact to slide on a second contact in a switch mechanism (103) included in a microswitch by applying a force (F?) via an actuator (102a) and a plunger (102b).

Abstract: Provided is a switching device with both high durability and high contact reliability. The switching device includes a movable contact and a fixed contact mutually slide to switch a switching mechanism. In the switching device, on a surface of the fixed contact, a contact portion to come into contact with the movable contact is coated with hard plating having a Martens hardness of 132 mgf/?m2 or more.

Abstract: It is an object of the present invention to provide a switch with which heat resistance and cold resistance can both be increased inexpensively. This switch comprises a bearing member, a shaft, a manipulation member, and a switch main body. The shaft is slidably supported by the bearing member. The manipulation member is linked to the shaft. The switch main body switches a contact according to displacement of the shaft. The shaft or the bearing member includes a sliding face having a groove.

Abstract: A key switch which could, for example, be used to switch a power supply for a machine tool on and off, has a locking mechanism on a rotating element of a key disengages the locking mechanism on the rotating element. The key also engages the guide on the rotating element, thereby initiating the rotation of that element and activating the switching element. If an object other than the key is inserted, the lock on the rotating element will not be released, and the rotating element will be prevented from moving, so that the switching element cannot be activated. Furthermore in another embodiment, a machine stop detection signal is fed to an internal solenoid which prevents removal of the key until the machine stops completely.