Hitachi Koki Co., Ltd.

Junichi Kamimura

Shinki Ohtsu

Hiroto Inagawa

Takuhiro Murakami

Satsuo Sato

Kenichirou Yoshida

Toshinori Yasutomi

Yoshikazu Yokoyama

Mitsuyuki Ishikawa

Naoya Eto

Yoshimitsu Kawasaki

Katsuhiro Oomori

Yukihiro Shima

Mizuho Nakamura

Naoto Ichihashi

Mitsuo Ogura

Takashi Kawamata

Juurou Kobayashi

Yoshio Osada

Shigetoshi Ishida

Kenji Niwa

Mitsuhiro Sunaoshi

The motorized cutter with wheels () comprises a motorized cutter () and a carriage (). The motorized cutter () is equipped with an engine (), a blade () rotatably driven by the engine (), and a light-emitting unit () that generates laser light () in the same plane as the plane of rotation of the blade (). A roadbed () is then cut along a line (X) drawn on the roadbed () by operating the motorized cutter with wheels () so that the line (X) is irradiated with the laser light (). It is possible to remove the motorized cutter () from the carriage () together with the light-emitting unit ().

Motorized cutter, motorized cutter with wheels, and cutting method

The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston.

Two cycle engine and two cycle engine tool

A two cycle engine has an exhaust port provided in a side portion of a cylinder, and a scavenge air port provided in the side portion of the cylinder so as to be symmetrical with a plane passing through a center in a cylinder circumference direction of the exhaust port and an axis extending to inside of the cylinder, the scavenge air port is structured such that an axis extending to inside of the cylinder from an opening of the scavenge air port extends in such a direction as to be away from the exhaust port of the cylinder, and is divided in a cylinder axis direction by a dividing portion.

Two cycle engine and tool

The electric tool includes a base having an opening portion and a bottom face; a blade being projected downward from the bottom face of the base through the opening portion of the base, the blade being capable of cutting while sliding the bottom face of the base on an upper face of a work piece; a motor driving the blade; a housing accommodating the motor. The bottom face of the base is at least partially coated with a resin including fluorine.

Electric tool

An impact tool comprising a motor, a hammerthat is rotated and axially moved by a drive force of the motor, an anvilthat repeats engagement/disengagement from the hammeraccompanying rotation and axial movements of the hammer, and a tip toolmounted to the anvil, the anvilcomprising a first split pieceA, which includes pawls(first concave-convex part) on an opposite side to the hammer and repeats engagement/disengagement from the hammer, a second split pieceB, which includes pawls(second concave-convex part) engageable with the pawls (first concave-convex part)of the first split pieceA in a direction of rotation, and to which the tip toolis mounted, and a rubber damper (elastic body)interposed between the first and second split piecesA,B to prevent direct contact between the pawls (first concave-convex part)and the pawls (second concave-convex part)in the direction of rotation and in an axial direction.

Impact tool

A power tool including a gear unit provided with a load moderating mechanism capable of reducing noise and prolonging service life. A coupling is force fitted with a spindle at a predetermined pressure allowing the spindle and the coupling to rotate relative to each other when a load exceeding a predetermined load is applied therebetween. A gear has a surround section having a convex and surrounding the coupling. The coupling has an abutment projection abutable against the convex and a damper projection. An elastic member is interposed between the damper projection and the surround section. Rotation of the gear is transmitted to the spindle through the elastic member and the coupling.

Power tool and gear unit assembled therein

Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission keycomposed of high-strength plastic is provided between an output shaftand a gearand a plane or a V-groove is formed on each of the output shaftand the gearcontacting the power transmission key

Electric power tool

Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key composed of high-strength plastic is provided between an output shaft and a gear , and a plane or a V-groove is formed on each of the output shaft and the gear contacting the power transmission key

Growing community of inventors

Ibaraki, Japan

Junichi Kamimura