Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: A cation exchange membrane includes: a membrane body containing a fluorine-based polymer having an ion-exchange group; and two or more reinforcing core materials arranged approximately in parallel within the membrane body. The membrane body is provided with two or more elution holes formed between the reinforcing core materials adjacent to each other. A distance between the reinforcing core materials adjacent to each other is represented by a, a distance between the reinforcing core materials and the elution holes adjacent to each other is represented by b, a distance between the elution holes adjacent to each other is represented by c, and the number of the elution holes formed between the reinforcing core materials adjacent to each other is represented by n. The relationship represented by the following expression (1) or expression (2) are satisfied: b>a/(n+1)??(1); c>a/(n+1)??(2).

Abstract: An electric caulking gun may include a main body portion including a cartridge setting portion to which a cartridge containing a caulking material can be set, an electric motor disposed within the main body portion, and a push rod configured to be pressed against the cartridge for dispensing the caulking material from the cartridge. The push rod may be coupled to the electric motor so as to advance and retract along a moving path. The electric motor may extend in a right and left direction across a vertical plane including the moving path of the push rod.

Abstract: It is an object of the invention to provide a technique for enhancing the operability of a power tool. A representative screwdriver 100 is provided which has a motor 110 and a driving mechanism 120. The driving mechanism 120 has a rotation transmitting mechanism including a driving cam 137 and a driven cam 157, and a cam engagement state is switched by movement of the spindle 150 in a longitudinal direction of the spindle. The position of the spindle 150 in the longitudinal direction is detected by a detecting mechanism 162 that is disposed on the opposite side of the rotation transmitting mechanism from a front end region in the longitudinal direction of the spindle 150. A controller 180 controls the rotation speed of the motor 110 based on the detection result of the detecting mechanism 162 and drives the motor 110.

Abstract: Provided is a cation exchange membrane having excellent mechanical strength against folding and the like and capable of delivering stable electrolytic performance for a long time, an electrolysis vessel using the cation exchange membrane and a method for producing the cation exchange membrane. A cation exchange membrane 1 at least includes: a membrane body containing a fluorine-based polymer having an ion-exchange group; and two or more reinforcing core materials arranged approximately in parallel within the membrane body. The membrane body is provided with two or more elution holes 12 formed between the reinforcing core materials 10 adjacent to each other.

Abstract: A sleeve body with bearings interposed between the sleeve body and a center shaft portion is integrally coupled to an oil pulse generator. A coupling body is rotatable together with the output portion. Balls are fitted between an outer surface of the sleeve body and an inner surface of the coupling body. Cam grooves are L-shaped in plan view, and formed in a portion of the outer surface of the sleeve body at which the balls are fitted. Rotation of the output portion is transmitted from the coupling body to the sleeve body and the oil pulse generator via the balls. When rotational speed between the sleeve body and the coupling body is different, the balls relatively turn in the cam grooves to move the coupling body forward against an urging force of the coil spring so as to relieve an impact.

Abstract: An impact driver or impact tool includes a motor, a motor housing that houses the motor, a grip housing integrally provided with the motor housing, a hammer case is disposed frontward of the motor housing, a spindle rotated by the motor, a hammer housed inside the hammer case and configured to be rotated by the spindle, and an anvil housed inside the hammer case which anvil is configured to be impacted by the hammer. In this impact driver, a length from a rear end of the motor housing to a front end of the anvil (i.e., the front-rear length of a main body) is less than 128 mm.

Abstract: The cover is provided with engaging pieces that engage with a recessed groove provided on the outer peripheral surface of a hammer case and hold the cover on the hammer case to prevent the cover from being detached. The cover is also provided with bumper receiving portions extending from the front end of the cover and allowing the bumper to be externally attached to the cover, and engaging claws formed on the bumper receiving portions and engaging with engaged recessed portions formed on the inner peripheral surface of the bumper for holding the bumper to prevent the bumper from being detached from the cover. The cover with the bumper attached to the bumper receiving portions is provided to the hammer case.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: An electric caulking gun may include a main body portion including a cartridge setting portion to which a cartridge containing a caulking material can be set, an electric motor disposed within the main body portion, and a push rod configured to be pressed against the cartridge for dispensing the caulking material from the cartridge. The push rod may be coupled to the electric motor so as to advance and retract along a moving path. The electric motor may extend in a right and left direction across a vertical plane including the moving path of the push rod.

Abstract: An electric wheeled apparatus comprises a main body, a drive wheel supported by the main body in a rotatable manner, an electric motor configured to apply torque to the drive wheel, a battery holder configured to removably receive a plurality of battery packs, and a circuit unit configured to electrically connect one or more battery packs attached to the battery holder to the motor regardless of a number of battery packs attached to the battery holder.

Abstract: In an impact driver, a supporting ring, to which a carabiner and so on of a socket is connected, is provided in a shaft support portion in a front end of a hammer case so that the supporting ring is able to be attached and detached by using a screw. Further, a falling prevention element (wire) is provided in the supporting ring. The falling prevention element comes to a position adjacent to the screw which clamps the supporting ring so that the supporting ring is prevented from falling from the impact driver.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: In an impact tool, a hammer is divided into an inner-side main hammer engageable with or disengageable from an anvil and an outer-side sub hammer having a peripheral wall covering an outer periphery of the main hammer and formed as a separate member. The sub hammer is rotatably disposed in a rearward position, and the peripheral wall is engageable with the main hammer so that the main hammer and the sub hammer are unitarily rotatable. A connecting member is disposed between the main hammer and the peripheral wall in such a manner as to be movable between a connecting position and a disconnected position using a switching device. When the connecting member is moved in the connecting position, a drill mode is selected, in which retraction of the main hammer is restricted.

Abstract: An object of the present invention is to prevent a socket from falling off by means of a simple and compact configuration without impairing comfort and ease of use, regardless of model. In an impact driver, a connecting ring in which a protrusion including a through hole protrudes from an outer periphery thereof is clamped detachably to an outer periphery of a shaft support portion of a hammer case. By a carabiner passing through a ring of a socket and the through hole in the connecting ring and engaging the carabiner, a socket portion can be prevented from falling off when a bit portion is broken.

Abstract: A cation exchange membrane includes: a membrane body containing a fluorine-based polymer having an ion-exchange group; and two or more reinforcing core materials arranged approximately in parallel within the membrane body. The membrane body is provided with two or more elution holes formed between the reinforcing core materials adjacent to each other. A distance between the reinforcing core materials adjacent to each other is represented by a, a distance between the reinforcing core materials and the elution holes adjacent to each other is represented by b, a distance between the elution holes adjacent to each other is represented by c, and the number of the elution holes formed between the reinforcing core materials adjacent to each other is represented by n.

Abstract: An oil pulse rotary tool includes a motor, a speed reduction mechanism to which rotation is transmitted from the motor, and an oil pulse generator disposed in front of and coaxially with the speed reduction mechanism. The motor, the speed reduction mechanism, and the oil pulse generator are housed in a housing. A carrier portion is provided coaxially with the oil pulse generator to project from a rear portion of the oil pulse generator. Support shafts that support planetary gears provided in the speed reduction mechanism are fixed to the carrier portion. A bearing is provided between the planetary gears and the oil pulse generator to support the carrier portion.

Abstract: A sleeve body with bearings interposed between the sleeve body and a center shaft portion is integrally coupled to an oil pulse generator. A coupling body is rotatable together with the output portion. Balls are fitted between an outer surface of the sleeve body and an inner surface of the coupling body. Cam grooves are L-shaped in plan view, and formed in a portion of the outer surface of the sleeve body at which the balls are fitted. Rotation of the output portion is transmitted from the coupling body to the sleeve body and the oil pulse generator via the balls. When rotational speed between the sleeve body and the coupling body is different, the balls relatively turn in the cam grooves to move the coupling body forward against an urging force of the coil spring so as to relieve an impact.