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 contact mechanism includes an opening/closing fixed contact, an opening/closing movable contact opposed to the opening/closing fixed contact, and a permanent magnet configured to extend an arc that occurs between the opening/closing fixed contact and the opening/closing movable contact in a predetermined direction. In particular, an arc that occurs from contact surface regions where the opening/closing fixed contact and the opening/closing movable contact make contact with each other is extended by a magnetic force of the permanent magnet and moved to non-contact surface regions where the opening/closing fixed contact and the opening/closing movable contact make no contact with each other.

Abstract: A pair of open/close and current-passing movable contact pieces is supported on a movable contact terminal such that the pair is rotatable along with the reciprocation of an operating element. An open/close movable contact is mounted on the open/close movable contact piece and is rotatably biased by a spring member. A current-passing movable contact is mounted on the current-passing movable contact piece. By moving the operating element, a restriction imposed on a position of the operating element is released so that the open/close movable contact piece is rotated by a spring force of the spring member whereby the open/close movable contact is brought into pressure contact with an open/close fixed contact mounted on a fixed contact terminal. The current-passing movable contact piece is rotated by the operating element so that the current-passing movable contact is brought into pressure contact with a current-passing fixed contact mounted on the fixed contact terminal.

Abstract: A contact mechanism includes an opening/closing fixed contact, an opening/closing movable contact opposed to the opening/closing fixed contact, and a permanent magnet configured to extend an arc that occurs between the opening/closing fixed contact and the opening/closing movable contact in a predetermined direction. In particular, an arc that occurs from contact surface regions where the opening/closing fixed contact and the opening/closing movable contact make contact with each other is extended by a magnetic force of the permanent magnet and moved to non-contact surface regions where the opening/closing fixed contact and the opening/closing movable contact make no contact with each other.

Abstract: A terminal connection structure has a housing, a base housed in the housing, and a terminal unit having a pair of tab terminals disposed on the base, a pair of terminal portions disposed in the tab terminals in parallel, each of which is exposed from the housing and configured to be connected to an external terminal, and a terminal plate sandwiched between the pair of tab terminals.

Abstract: A terminal connection structure has a housing, a base housed in the housing, and a terminal unit having a pair of tab terminals disposed on the base, a pair of terminal portions disposed in the tab terminals in parallel, each of which is exposed from the housing and configured to be connected to an external terminal, and a terminal plate sandwiched between the pair of tab terminals.

Abstract: A terminal connection structure has a housing, a base housed in the housing, and a terminal unit having a pair of tab terminals disposed on the base, a pair of terminal portions disposed in the tab terminals in parallel, each of which is exposed from the housing and configured to be connected to an external terminal, and a terminal plate sandwiched between the pair of tab terminals.

Abstract: A pair of open/close and current-passing movable contact pieces is supported on a movable contact terminal such that the pair is rotatable along with the reciprocation of an operating element. An open/close movable contact is mounted on the open/close movable contact piece and is rotatably biased by a spring member. A current-passing movable contact is mounted on the current-passing movable contact piece. By moving the operating element, a restriction imposed on a position of the operating element is released so that the open/close movable contact piece is rotated by a spring force of the spring member whereby the open/close movable contact is brought into pressure contact with an open/close fixed contact mounted on a fixed contact terminal. The current-passing movable contact piece is rotated by the operating element so that the current-passing movable contact is brought into pressure contact with a current-passing fixed contact mounted on the fixed contact terminal.

Abstract: An operating-lever sealing structure has an operating lever turnably attached to a housing of a switch, a shaft portion projected immediately below a guard portion of the operating lever that is turnably supported in an operation hole made in a bottom surface of a fitting recess of the housing, and a sealing ring that is sandwiched between the bottom surface of the fitting recess and a ceiling surface of the guard portion of the operating lever.

Abstract: A terminal connection structure has a housing, a base housed in the housing, and a terminal unit having a pair of tab terminals disposed on the base, a pair of terminal portions disposed in the tab terminals in parallel, each of which is exposed from the housing and configured to be connected to an external terminal, and a terminal plate sandwiched between the pair of tab terminals.

Abstract: A switch designed for dustproof performance by minimizing a route of entry of dust from a terminal portion, includes a plurality of terminals, a movable contact piece that is supported in a manner allowing displacement between a non-conduction position and a conduction position, and a contact actuating member that displaces the movable contact piece in response to an externally applied pressing force. A main body of the switch includes an opening communicating with the outside, partition walls formed between the opening and the movable contact piece, barrier walls formed between the opening and the movable contact piece, and passages formed by ends of the barrier walls and walls that are opposite the ends of the barrier walls. Each partition wall extends across the corresponding passage and each terminal includes a connection portion and a blocking portion that is bent from the connection portion and blocks the corresponding passage.

Abstract: An operating-lever sealing structure has an operating lever turnably attached to a housing of a switch, a shaft portion projected immediately below a guard portion of the operating lever that is turnably supported in an operation hole made in a bottom surface of a fitting recess of the housing, and a sealing ring that is sandwiched between the bottom surface of the fitting recess and a ceiling surface of the guard portion of the operating lever.

Abstract: A long-life cover is provided whose outer circumferential edge is not warped upward and not easily damaged even when an operation shaft is pushed down to a final position. Therefore, the cover is to cover the operation shaft protruding from a housing of an electric device and is operable in the axis direction. Particularly, the cover includes a tubular pressing portion to which a pressing force is applied by operating the operation shaft, and a tubular elastic deformation portion continuous to a lower edge of an outer circumference of the tubular pressing portion, the tubular elastic deformation portion being thinner than the tubular pressing portion.

Abstract: A switch designed for dustproof performance by minimizing a route of entry of dust from a terminal portion, includes a plurality of terminals, a movable contact piece that is supported in a manner allowing displacement between a non-conduction position and a conduction position, and a contact actuating member that displaces the movable contact piece in response to an externally applied pressing force. A main body of the switch includes an opening communicating with the outside, partition walls formed between the opening and the movable contact piece, barrier walls formed between the opening and the movable contact piece, and passages formed by ends of the barrier walls and walls that are opposite the ends of the barrier walls. Each partition wall extends across the corresponding passage and each terminal includes a connection portion and a blocking portion that is bent from the connection portion and blocks the corresponding passage.