Hitachi Koki Co., Ltd.

Shouichi Hirai

Hiroki Kitagawa

Yasuki Ohmori

Masashi Nishida

Yoshiichi Komazaki

Tetsuhito Shige

Norikazu Baba

Masaya Nagao

Kousuke Akutsu

Michio Wakabayashi

Yoshimitsu Iijima

Takashi Mori

Akiyuki Miyazaki

The nailing machine () comprises an air passage () allowing communication between a cylinder () and a return air chamber () in which compressed air for returning a piston () to the initial position is accumulated. The air passage () is provided with a control valve () controlling entry of compressed air into the return air chamber () from the cylinder (). The control valve () opens the air passage () and allows entry of compressed air into the return air chamber () in the case wherein the nailed object produces a small reaction force upon driving the nail, namely when the upward moving distance of the body () relative to the push lever () is smaller than a predetermined distance. The compressed air that has entered the return air chamber () further enters a below-the-piston chamber and serves as air damper, reducing the driving force.

Pneumatic driving machine

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

The nailing machine () comprises an air passage () allowing communication between a cylinder () and a return air chamber () in which compressed air for returning a piston () to the initial position is accumulated. The air passage () is provided with a control valve () controlling entry of compressed air into the return air chamber () from the cylinder (). The control valve () opens the air passageand allows entry of compressed air into the return air chamber () in the case wherein the nailed object produces a small reaction force upon driving the nail, namely when the upward moving distance of the body () relative to the push lever () is smaller than a predetermined distance. The compressed air that has entered the return air chamber () further enters a below-the-piston chamber and serves as air damper, reducing excess energy absorbed by a piston bumper ().

A pneumatically operated power tool includes an outer frame, a driving components, a pressure reduction valve, and a switching valve. The outer frame has a compressed air intake portion and defines therein a compressed air chamber. The driving components are disposed in the outer frame and are driven by a compressed air in the compressed air chamber. The pressure reduction valve defines a pressure receiving space and allows a compressed air to flow from the air intake portion to the compressed air chamber and to the pressure receiving space. The switching valve is movable between a first position where the compressed air flows from the compressed air intake portion to the pressure receiving space, and a second position where a communication between the compressed air intake portion and the pressure receiving space is blocked. The pressure reduction valve is configured to set a compressed air pressure in the compressed air chamber to a first pressure level if the switching valve is located at the first position and to set the compressed air pressure to a second pressure level lower than the first pressure level if the switching valve is located at the second position.

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Hitachinaka, Japan

Shouichi Hirai