Yamabiko Corporation

Walbro Corporation

Hisato Osawa

Takahiro Yamazaki

Kenji Nakano

Hidekazu Tsunoda

Takeshi Maeno

Kosuke Matsumoto

Noriyuki Takeuchi

Yuuta Kobayashi

Ken Shirai

Takuo Yoshizaki

Atsushi Nishimura

Kazuhiro Yoneyama

Satsuki Yuzuki

Yuji Numakunai

Kunio Shimizu

Shunsuke Ueda

Hiroki Ogasawara

Tomoyoshi Kudo

Kazuya Hanada

Tadashi Ishimura

Shunsuke Nakadate

Noriyuki Takeushi

A handheld driving apparatus includes a container having a grasping member, a lock member having a protrusion, a trigger lever, and an action unit. The lock member moves between first and second positions along right and left directions. The second position is a fully pressed position. The trigger lever moves between third and fourth positions. The fourth position is a fully pressed position. The trigger lever is restricted from moving toward the fourth position by contacting the first protrusion when the lock member is in the first position. The trigger lever is free to move toward the fourth position without contacting the first protrusion when the lock member is in the second position. The action unit performs a mechanical action for mowing or cutting an object when the trigger lever is in the fourth position.

Driving apparatus

A power working machine comprises a working portion, a driving portion, a main body portion, and a blowing portion. The working portion is configured to act on a work object. The driving portion is configured to drive the working portion. The main body portion includes a bottom surface portion, an intake port, and an exhaust port, and is configured to form a storage space for storing the driving portion and an airflow path leading from the intake port to the exhaust port through the storage space. The blowing portion is configured to generate an airflow in the airflow path toward the exhaust port. The intake port is configured to open in a direction having a vertical downward component in a first state in which the power working machine is placed with the bottom surface portion facing a horizontal surface.

Power working machine

A chainsaw (electric working tool) includes a body case, a cutting part (working implement), and a motor, wherein the motor is mounted in a motor case disposed in a cooling route; an intake communicating with the cooling route is opened on the body case and communicates through the retention chamber with the cooling route; an air filter is inserted into the body case and arranged adjacent to the intake; the body case has a filter insertion/extraction hole opened thereon and the hole communicates with the retention chamber, through which hole the air filter is attachable to and removable from the retention chamber and be a cover for it.

Electric working tool

Provided is an electric power work device, which is a chain saw, including: a body case; a cutting part protruding forward from the body case; a motor to drive the cutting part, and a battery. A top handle is provided at an upside with respect to the body case, and, a side handle is provided at a left side surface of the body case. The battery is detachably mounted in a battery part formed behind the top handle. Further, interference reduction part is formed behind the top handle to reduce interference with a palm holding the top handle or a wrist.

Electric power work device

An electric power work device simplifies a mechanism of a battery attachment part and easily removes a battery from the battery attachment part. A chain saw includes a body case, a cutting part (a work tool), and the battery. A battery removal mechanism for removing the battery is provided on a rear part of the body case. The battery removal mechanism includes a lower end of the battery and a bottom surface of the body case. The lower end of the battery protrudes downward from the bottom surface of the body case, and a frontmost end of a lower part of the battery is disposed in front of a rear end of a lower part of a top handle. Another battery removal mechanism includes a protrusion on the bottom surface of the body case and in front of the lower end of the battery.

A chainsaw (electric working tool) includes a body case; a cutting part (working implement); and a motor, wherein the motor is mounted in a cooling route in the body case; an intake communicating with the cooling route is opened on the body case; an air filter is housed between the intake and the cooling route; the body case has a filter insertion/extraction hole through which the air filter can be inserted and removed; the intake is opened on the outer surface of the body case; and the filter insertion/extraction hole is arranged at a portion other than that of the intake so that the motor can be efficiently cooled, dust hardly enters the cooling route, and maintenance can be easily performed.

Provided is a hand-held working machine, including a connection receiving portion configured to connect an anchoring rope, which is configured to couple a machine body and an operator to each other, to the machine body. The connection receiving portion includes: an other-function portion provided to the machine body as a portion having other function or use; and a protrusion configured to retain the anchoring rope at a predetermined position of the other-function portion.

Hand-held working machine

Provided is an electric power work device which includes: a body case; a work tool protruding forward from a front side with respect to the body case; a motor; and a battery supplying power to the motor. The motor is accommodated in the body case and the battery is detachably attached to a rear side with respect to the body case. A top handle is extended in a longitudinal direction at an upside with respect to the body case. The top handle includes, on an upper surface of a front part thereof, a thumb rest and a power switch. The power switch is arranged on a side in a lateral direction of the thumb rest.

A chainsaw(electric-power-driven working device) comprises a body case, a cutting attachment(work tool), a motorand a battery. A front portionof the body casehouses the motorand a battery mount-and-release portionis formed on a rear portionof the body case. The batterymounted on the battery mount-and-release portionextends in an upper-lower direction across and over a middle portion in a height direction of the rear portionof the body case. The side handlearranged to a side face of the body caseextends from the front portionto the rear portionof the body case. A rear end portionof the side handle is disposed rearward of and below an output shaftof the motor

Electric-power-driven working device

The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston grooveformed in a peripheral surface of a piston includes a pressure transmission through hole, and the pressure transmission through holeconsistently communicates with a crankcase. In the course of the piston moving up, upon a pressure in the crankcase becoming negative, the negative pressure in the crankcase affects the piston groovethrough the pressure transmission through hole. Consequently, a pressure in the piston grooveis released to the crankcase through the pressure transmission through hole. Upon the piston moving up and the piston groovebeing thereby brought into communication with the air port, air enters the piston groovethrough the air port((III) of FIG.).

Air leading-type stratified scavenging two-stroke internal-combustion engine

To improve the effect of preventing contamination of an element in an air cleaner. An air cleaner includes a first inlet () through which air is fed to an intake system air passage and a second inlet () through which air is fed to an intake system air-fuel mixture passage. An extended passage () leads to the second inlet (), for example. A passage forming member () forming the extended passage () is shaped to surround a periphery of the first inlet (). The passage forming member () forms a blown-back fuel diffusion preventing region () leading to the first inlet ().

Air cleaner for stratified scavenging two-stroke internal combustion engine

To balance a 'low-temperature scavenging effect' and a 'high-temperature scavenging effect.' A scavenging system applicable to a leading-air type two-stroke air-cooled engine has a low-temperature scavenging passage and a high-temperature scavenging passage. The low-temperature scavenging passage has first and second passages and includes scavenging ports at upper end parts thereof. The high-temperature scavenging passage has first and second passages and includes scavenging ports at upper end parts thereof. An air is filled through a piston groove into the passages. The low-temperature scavenging passage has a relatively small capacity. The high-temperature scavenging passage has a relatively large capacity.

Leading-air type two-stroke air-cooled engine

An amount of air taken into an air leading type two-stroke engine is increased to enhance an engine output, and gas emission characteristic deterioration caused by blow-back is inhibited. An inhibition memberis disposed between a choke valvein a full open position and a throttle valvein a full open position. The inhibition memberincludes, for example, a mesh member like a metal mesh. Mixed fuel containing oil is supplied to the air-fuel mixture channel. Numerous pores of the inhibition member(mesh member) are occluded by a membrane of oil components of the mixed fuel. Consequently, entry of a blow-back flow of an air-fuel mixture from the air-fuel mixture channelinto the air channelthrough the numerous pores of the flow inhibition member(mesh member) can be inhibited.

Air leading type two-stroke engine and intake system for same, and carburetor

To enhance responsivity of temperature sensor detecting an engine temperature. A temperature sensor componentincludes a metal washer. The temperature sensor componenttransfers the engine temperature to a sensor bodyvia the heat transfer washer. A cylinder portionof a cylinder blockhas two bosses. The washerof the temperature sensor componentis fixed to the bosstogether with the electronic control unit

Growing community of inventors

Tokyo, Japan

Hisato Osawa