An electric tool is provided with a second switch that is actuated in order for the tool to be used. The second switch is on a second handle that is grasped by the operator with a different hand than the hand that actuates the main trigger switch. Communication between the second switch and the tool occurs with a wireless signal indicating that the second switch has been actuated.

An electric tool is provided with a second switch that is actuated in order for the tool to be used. The second switch is on a second handle that is grasped by the operator with a different hand than the hand that actuates the main trigger switch. Communication between the second switch and the tool occurs with a wireless signal indicating that the second switch has been actuated.

A holding plate is positioned on an opposite side of a contact member to a surface of a base in an operation direction. When no external force acts on a movable joint, the holding plate places, with the contact member in-between, a load on a movable member in a direction in which a first movable contact and a second movable contact are pressed, respectively, against a first fixture contact and a second fixture contact. The contact member is disposed between the holding plate and a member in the operation direction.

A keyswitch structure includes a keycap, a base plate, a first support, and a second support. The first support and the second support are pivotally connected with each other and are connected to and between the keycap and the base plate. The first support includes a shaft socket, a shaft portion, and a protruding interference portion which are adjacently arranged. Correspondingly, the second support includes a shaft portion, a shaft socket, and a recess interference portion which are adjacently arranged. The recess interference portion has a relief space and a block beside the relief space. The first support and the second support are pivotally connected by engaging the shaft sockets with the corresponding shaft portions; therein, the protruding interference portion is located in the relief space, and the block obstructs the protruding interference portion moving out of the relief space.

A keyswitch structure includes a keycap, a base plate, a first support, and a second support. The first support and the second support are pivotally connected with each other and are connected to and between the keycap and the base plate. The first support includes a shaft socket, a shaft portion, and a protruding interference portion which are adjacently arranged. Correspondingly, the second support includes a shaft portion, a shaft socket, and a recess interference portion which are adjacently arranged. The recess interference portion has a relief space and a block beside the relief space. The first support and the second support are pivotally connected by engaging the shaft sockets with the corresponding shaft portions; therein, the protruding interference portion is located in the relief space, and the block obstructs the protruding interference portion moving out of the relief space.

Devices comprising at least two electrodes with a layer disposed therebetween are disclosed. In some embodiments, the layer disposed therebetween may be an insulator. In some embodiments, the layer may be capable of being deformed. Deforming the layer may cause a change in one or more materials properties of the device, such as the electrical properties and/or the optical properties of the device.

Devices comprising at least two electrodes with a layer disposed therebetween are disclosed. In some embodiments, the layer disposed therebetween may be an insulator. In some embodiments, the layer may be capable of being deformed. Deforming the layer may cause a change in one or more materials properties of the device, such as the electrical properties and/or the optical properties of the device.

A keyboard includes a backlight module, a base plate, a membrane circuit disposed on the base plate, and a plurality of key structures disposed on the membrane circuit. The backlight module includes a light source, a reflective layer, a light guide layer, and a shielding layer. The light source is disposed corresponding to the light guide layer. The light guide layer is located between the shielding layer and the reflective layer. The light guide layer has a through-hole. The shielding layer and the reflective layer are in contact with each other in the through-hole of the light guide layer. The base plate is disposed on the shielding layer. The base plate has a positioning portion disposed corresponding to the through-hole of the light guide layer, which protrudes toward the reflective layer or the membrane circuit.

An irreversible power switch which is operational from the outside after lamination of laminated communication device and the like, includes a substrate, electrodes disposed on the substrate, a brittle member disposed so as to face the electrodes and apart from the electrodes and a conductive adhesive portion disposed on the brittle member at a side to face the electrodes thereof. The electrodes and the conductive adhesive portion are irreversibly and electrically bonded by brittle fracture of the brittle member under the external pressing force in the thickness direction of the laminated communication device.

An irreversible power switch which is operational from the outside after lamination of laminated communication device and the like, includes a substrate, electrodes disposed on the substrate, a brittle member disposed so as to face the electrodes and apart from the electrodes and a conductive adhesive portion disposed on the brittle member at a side to face the electrodes thereof. The electrodes and the conductive adhesive portion are irreversibly and electrically bonded by brittle fracture of the brittle member under the external pressing force in the thickness direction of the laminated communication device.