Abstract: A plurality of resistance-imparting portions (34A to 34E) are disposed adjacent to each other. A first contraction flow portion forming one of the resistance-imparting portions (34A to 34E) adjacent to each other is in communication with an enlarged diameter portion forming another resistance-imparting portion. First contraction flow portions (32AH to 32DH) forming the resistance-imparting portions (34A to 34E) adjacent to each other are disposed at different positions in a direction in which an outer frame member (31) extends.

Abstract: A chainsaw includes a body housing, an elongated guide bar projecting forward from the body housing, a saw-chain mounted on the periphery of the guide bar for rotation, an electric motor mounted within the body housing for rotating, and a top handle provided on an upper portion of the body housing above the guide bar and extending in a fore-and-aft direction. A plurality of rechargeable battery packs is mounted on the body housing as a source of power supply for the electric motor. The battery packs are mounted to the body housing in such a manner that a center of gravity of the chainsaw observed from the back side is positioned in a two times extent of lateral width of a gripe portion of the top handle at both sides of a vertical centerline of the gripe portion.

Abstract: A chainsaw includes a body housing, an elongated guide bar projecting forward from the body housing, a saw-chain mounted on the periphery of the guide bar for rotation, an electric motor mounted within the body housing for rotating, and a top handle provided on an upper portion of the body housing above the guide bar and extending in a fore-and-aft direction. A plurality of rechargeable battery packs is mounted on the body housing as a source of power supply for the electric motor. The battery packs are mounted to the body housing in such a manner that a center of gravity of the chainsaw observed from the back side is positioned in a two times extent of lateral width of a gripe portion of the top handle at both sides of a vertical centerline of the gripe portion.

Abstract: The present invention includes a portable tool including a tool body having a handle, a hook including a hook body, and a mounting device. The mounting device enables the hook body to be mounted to the handle with the hook body oriented in any one of a plurality of different directions and positioned at any one of a plurality of different positions along the oriented direction.

Abstract: A fan switch and an ignition switch are arranged such that the moving directions of operating buttons thereof cross the moving directions of a contact lever and the moving direction of a switch lever, respectively.

Abstract: A drive tool includes an ejector, a press member, a press detection switch, an operation member, an operation detection switch, a control unit, an operation state detector, and a report unit. The control unit makes the ejector carry out ejection of a fastening tool when the press detection switch and the operation detection switch are turned on. The operation state detector detects a case where the drive tool comes into one of a plurality of kinds of preset operation states which include at least one operation state other than a state of a battery. Report patterns different for each of the plurality of kinds of operation states are set in the report unit. When one of the operation states is detected by the operation state detector, the report unit reports the detection using the report pattern set corresponding to the detected operation state.

Abstract: A magazine in a fastener driving tool includes a magazine body, a pusher, a biasing device and a pusher holding device. The magazine body defines a fastener receiving space for storing a plurality of fasteners therein. The pusher is mounted to the magazine body and is movable in a fastener feeding direction toward a fastener driving channel defined in a tool body of the fastener driving tool. The biasing device biases the pusher in the fastener feeding direction. The pusher holding device can hold the pusher at a midway position within a movable range of the pusher in the fastener feeding direction. The pusher holding device may include no insertion hole or only one insertion hole formed in the magazine body.

Abstract: A driving tool that has a driver support base. The driver support base includes a transmitting portion having a V-shape in cross section. The driver support base can be pressed by a press member to cause the transmitting portion to wedge between a pair of left and right drive wheels, so that a friction force is produced to move the driver support base.

Abstract: A drive tool includes an ejector, a press member, a press detection switch, an operation member, an operation detection switch, a control unit, an operation state detector, and a report unit. The control unit makes the ejector carry out ejection of a fastening tool when the press detection switch and the operation detection switch are turned on. The operation state detector detects a case where the drive tool comes into one of a plurality of kinds of preset operation states which include at least one operation state other than a state of a battery. Report patterns different for each of the plurality of kinds of operation states are set in the report unit. When one of the operation states is detected by the operation state detector, the report unit reports the detection using the report pattern set corresponding to the detected operation state.

Abstract: A fan switch and an ignition switch are arranged such that the moving directions of operating buttons thereof cross the moving directions of a contact lever and the moving direction of a switch lever, respectively.

Abstract: A driving tool that has a driver support base. The driver support base includes a transmitting portion having a V-shape in cross section. The driver support base can be pressed by a press member to cause the transmitting portion to wedge between a pair of left and right drive wheels, so that a friction force is produced to move the driver support base.

Abstract: The present invention includes a portable tool including a tool body having a handle, a hook including a hook body, and a mounting device. The mounting device enables the hook body to be mounted to the handle with the hook body oriented in any one of a plurality of different directions and positioned at any one of a plurality of different positions along the oriented direction.

Abstract: A magazine in a fastener driving tool includes a magazine body, a pusher, a biasing device and a pusher holding device. The magazine body defines a fastener receiving space for storing a plurality of fasteners therein. The pusher is mounted to the magazine body and is movable in a fattener feeding direction toward a fastener driving channel defined in a tool body of the fastener driving tool. The biasing device biases the pusher in the fastener feeding direction. The pusher holding device can hold the pusher at a midway position within a movable range of the pusher in the fastener feeding direction. The pusher holding device may include no insertion hole or only one insertion hole formed in the magazine body.

Abstract: It is an object of the present invention to provide a combustion power tool having a rational construction. A representative combustion power tool according to the invention may include a combustion chamber, a fuel supplier to supply fuel into the combustion chamber, an igniter disposed in the combustion chamber, a driving mechanism actuated to perform a predetermined operation by utilizing a combustion pressure generated when the fuel is burned in the combustion chamber and an actuator that operates the fuel supplier and the igniter in one operation. Based on the operation of the actuator, fuel is supplied into the combustion chamber via the fuel supplier and the igniter performs ignition in relation to the pressure of the fuel supplied into the combustion chamber changes. According to the invention, because the fuel supplying and ignition can be done by the actuator in one operation, ignition can be performed in constant timing after fuel is supplied via the fuel supplying means.

Abstract: A combustion power tool having a first combustion chamber, a second combustion chamber, an igniter, a partition, and a driving mechanism. Flammable gas is introduced or charged into the first and second combustion chamber. The igniter is disposed in the first combustion chamber. The partition separates the first combustion chamber from the second combustion chamber. Communication holes are formed in the partition at different angles with respect to the longitudinal direction of the first combustion chamber. The communication holes communicate the first combustion chamber with the second combustion chamber. The driving mechanism performs a predetermined processing work by utilizing an explosive combustion pressure.

Abstract: It is an object of the present invention to provide a combustion power tool having a rational construction. A representative combustion power tool according to the invention may include a combustion chamber, a fuel supplier to supply fuel into the combustion chamber, an igniter disposed in the combustion chamber, a driving mechanism actuated to perform a predetermined operation by utilizing a combustion pressure generated when the fuel is burned in the combustion chamber and an actuator that operates the fuel supplier and the igniter in one operation. Based on the operation of the actuator, fuel is supplied into the combustion chamber via the fuel supplier and the igniter performs ignition in relation to the pressure of the fuel supplied into the combustion chamber changes. According to the invention, because the fuel supplying and ignition can be done by the actuator in one operation, ignition can be performed in constant timing after fuel is supplied via the fuel supplying means.

Abstract: A combustion power tool having a first combustion chamber, a second combustion chamber, an igniter, a partition, and a driving mechanism. Flammable gas is introduced or charged into the first and second combustion chamber. The igniter is disposed in the first combustion chamber. The partition separates the first combustion chamber from the second combustion chamber. Communication holes are formed in the partition at different angles with respect to the longitudinal direction of the first combustion chamber. The communication holes communicate the first combustion chamber with the second combustion chamber. The driving mechanism performs a predetermined processing work by utilizing an explosive combustion pressure.

Abstract: A nail gun includes a contact arm that is movable relative to a nail gun body between an upper first stroke end position and a lower second stroke end position. The contact arm may prevent the nails from being driven when it is in the first stroke end position. A nail driving prevention device includes an engaging member that is movable to enter the moving path of the contact arm so as to prevent the contact arm from moving from the first stroke end position toward the second stroke end position when the number of the nails in a nail magazine has been reduced to a predetermined number. A deviating device is operable to change the moving course of the engaging member away from the moving path of the contact arm when the contact arm is positioned above the first stroke end position.

Abstract: A fastener driving tool includes a cylinder and a drive piston reciprocally movable within the cylinder. A driver is connected to the drive piston and is operable to drive fasteners when the drive piston is moved in a driving direction. The drive piston defines a gas chamber in the cylinder for accommodating a gas. A drive mechanism is provided for moving the drive piston from a first position to a second position in a direction opposite to the driving direction for compressing the gas within the gas chamber. The drive mechanism is operable to permit movement of the drive piston in the driving direction by the pressure of the gas compressed within the gas chamber when the drive piston reaches the second position.

Abstract: A fastener feeding mechanism in a fastener driving device is provided for feeding fasteners from a fastener support rail formed in a magazine to a fastener drive track formed in a driver guide for reciprocal movement of a driver and connected to a forward portion of the fastener support rail. The fastener feeding mechanism includes an operation member operable by an operator and slidably movable in a longitudinal direction of the fastener support rail. A biasing mechanism biases the operation member in the forward direction of the fastener support rail. A pusher is movable in the longitudinal direction of the fastener support rail and includes an abutting portion for abutting on the rear end of a row of the fasteners. The abutting portion is movable between a first position within the fastener support rail and a second position away from the fastener support rail.