Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Norikazu Baba

Yasuki Ohmori

Yoshiichi Komazaki

Shouichi Hirai

Tomomasa Nishikawa

Masanori Okada

Yoshitaka Akiba

Shingo Kosugi

Yoshimitsu Iijima

Tetsuhiro Harada

Yoshimitsu Iljima

In order to provide a driver for reducing reaction generated to a driver main body, the driverincludes a nose portionprovided in a housingand extending in a longitudinal direction, the nose portion being configured to allow a fastener to pass therethrough, a plungerconfigured to move in an impact direction parallel to the longitudinal direction to impact the fastener through the nose portion, a weight, and a coil springconfigured to be compressed by a motorin the longitudinal direction. a release of the compression causing the plungerto move in the impact direction, while causing the weightto move in a counter-impact direction which is away from the plunger. The coil springis provided between the plungerand the weight. The coil spring has one end portion urging the plunger, and another end portion urging the weight

Driver

A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing, a nose portionformed with an injection passagethrough which a fasteneris driven, a magazineaccommodating fastenersand supplying a fastenerto the nose portion, a push levermovable relative to the housingupon depression against the workpiece P, combustion chamber framesmovable in the housingin accordance with the movement of the push lever, and first and second cylindersfixed to the housing. First and second pistonsare movably disposed in the first and second cylinders, respectively, and a bitextends from the first piston. A rodformed with a rackA extends from the second piston. The rackA is engageable with a motion conversion mechanismfor converting a linear motion of the rodinto rotational motion of the bit

Fastener driving tool

A screw driving machine includes a bit that is movable to strike a screw against a workpiece and rotatable to rotate the screw to the workpiece, a combustion-type power mechanism including a spark plug that ignites combustible gas filled in a combustion chamber to apply striking force to cause the bit to strike the screw, a motor that generates a rotative force when supplied with electric force, and a power transmission mechanism that transmits the rotative force generated at the motor to the bit to cause the bit to rotate.

Screw driving machine having combustion-type power mechanism and electric power mechanism

When a push lever is brought in contact with a member to be driven, a second trigger stopper slides and a first trigger stopper slides via a second spring. After a third trigger stopper turns ON a push switchaccording to sliding of the first trigger stopper, the first trigger stopper further slides and a projecting portion and a projecting portion of a trigger are disengaged from each other, so that the trigger is made rotatable. A trigger switch is turned ON according to rotation of the trigger.

Driving machine

Portable gas nailing machine

Growing community of inventors

Hitachinaka, Japan

Norikazu Baba