Makita Corporation

Makita Electric Works, Ltd.

Katsumi Tozawa

Masaki Kondo

Tomonobu Nashimoto

Masayoshi Okumi

Fusao Fushiya

Naohiro Hayakawa

Tetsuya Hasegawa

Norifumi Niwa

Masaki Sugiyama

Masamichi Miyazawa

Youichi Kato

Takashi Yamazaki

Masayoshi Kondo

Takahide Kawakami

Zenichi Oda

Shigeru Takeda

Norio Isogai

Kouji Haneda

Mitsunori Watanabe

Hiroshi Fujimoto

A handheld engine-driven cutter is provided with a disk blade and a main body that drives the disk blade. The main body comprises a four-stroke engine, an oil supplying opening from which engine oil is supplied, and an oil exhausting opening from which the engine oil is exhausted. In this engine cutter, the oil supplying opening and the oil exhausting opening are both disposed on one side of the main body where one end of a driving axis of the four-stroke engine is located.

Engine-driven cutter

A cultivator may include at least one rechargeable battery for an electrical power tool as a power source. The at least one rechargeable battery may include a plurality of rechargeable batteries. Further, the plurality of rechargeable batteries may be switched in sequence, so as to be used as the power source.

Electric-power cultivator

A handheld engine-driven cutter is provided with a disk blade and an engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, at least one operation member that is operated by a user and connected to the carburetor via a link, and a shaft that is connected to the casing and supports the operation member in a swingable manner. A shaft receiving groove that supports the shaft is formed in the casing.

A cutting tool is provided for preventing dust intrusion into a guide member effectively as well as cooling a housing, thereby maintaining an excellent operability. A cutting tool has a body housing including an upper housing and a lower housing. In front of a flange portion of the lower housing, right-and-left air outlets are provided. At the front end of the lower housing, right-and-left second guiding ports are provided. Further, between an insulating cover and the lower housing, clearances which allow the outlets and the second guiding ports to communicate with each other are provided. Therefore, when the insulating cover is placed, an air passage is formed in which cooling air discharged from the air outlets moves to the front passing through the clearances, and flows into a space as the junction through the second guiding ports to be discharged to the front.

Cutting tool

A lock washer (,) presses balls (,) and pins (,) against a clutch cam (,) with protrusions (,) formed on its front face. A rear end (,) of a spring holder (,) abuts on the inner edge of the front face of the lock washer (,) while the half of the front end surface of each pin (,) abuts on the rear face of the outer edge of the lock washer (,). Furthermore, the compression spring (,) also abuts on the lock washer (,) with its outer edge approximately aligned with the outer edge of the lock washer (,). Therefore, if a large load is instantaneously applied to a spindle (,) at the end of screw tightening, the outer edge of the lock washer (,) deforms forward. This in turn causes the balls (,) to ride over the protrusions (,) of the clutch face, thus allowing a slight rotation of the internal gear (,). This clutch operation lessens the impact that occurs at the end of screw tightening, serving to protect the tool mechanism and to reduce the shock to the operator's hand.

Clutch mechanism for use in a power-driven tool

A simple attachment structure of the present invention ensures favorable connection of a battery pack with a battery holder in a power-driven tool over a long time period without causing any defective contact. A pair of side slots (47a,47b) as well as a pair of insertion slots (48a,48b) are formed in a connection surface (49) of an upper battery case (20) of a battery pack (10). Electrode terminal assemblies (41a,41b) are set in the side slots (47a,47b) and the insertion slots (48a,48b) to be exposed on the two side faces thereof. A positive spring terminal (64a) and a negative spring terminal (64b) are integrally joined with and supported by a terminal base 61 of a battery holder (60). Each spring terminal (64a,64b) has an insertion element (66a,66b) formed to have a width a little greater than the width of the insertion slot (48a,48b). When the spring terminals (64a,64b) are inserted into the insertion slots (48a,48b), the elasticity of the spring terminals (64a,64b) presses the insertion elements (66a,66b) thereof against the electrode terminal assemblies (41a,41b). This realizes electrical connection of the spring terminals (64a,64b) with the electrode terminal assemblies (41a,41b) and enables the battery pack (10) to be integrally joined with the battery holder (60) of the power-driven tool.

Attachment structure of battery pack to power-driven tools

Portable electric screwdriver

Cordless driver drill

Electric sprayer

Growing community of inventors

Anjo, Japan

Katsumi Tozawa