Makita Corporation

Other

Shinichi Nakane

Yutaka Matsunaga

Kazuma Oshima

Kazuyoshi Horikawa

Hiroshi Yamaguchi

Tomoo Muramatsu

An electrical connection device includes a first connector and a second connector capable of being mechanically and electrically connected to the first connector. A lock mechanism can lock the connection between the first and second connectors. The first connector has a cover capable of covering a connecting region between the first and second connectors. The second connector has an unlock device operable to unlock the lock mechanism. The unlock device is positioned not to interact with the cover when the first and second connectors are connected to each other.

Connectors for electric cords

A power tool has a motor housing that comprises housing halves arranged in the circumferential direction of a motor. A brush holder is disposed within the motor housing and serves to support brushes. The brush holder comprises holder halves that are arranged in the circumferential direction of the motor. In order to assemble the brush holder into the housing, one of the holder halves is set onto one of the housing halves. Thereafter, the rotor and the stator are set onto the one of the housing halves. Then, the other holder half is set onto the one of the holder halves and is joined thereto so as to form the brush holder. Finally, the other housing half is set onto the one of the housing halves and are joined thereto so as to form the motor housing.

Power tools having separable brush holder segments

A pair of brush assemblies,for use in an electric power tool each includes a brush holder,in which a carbon brush is inserted, a pair of elastic strips,protruding from the outside lower edges of the brush holder,The elastic strips,are folded back inward of the brush holder,such that each of the strips has a tapering, V-shaped cross-section and has elasticity in the widthwise direction of the brush holder,A pair of brush holder mounts,are provided on a motor housing of the electric power too, on which the brush assemblies,are installed. Each brush holder mount,includes a pair of positioning slots,for receiving the elastic strips,of the brush holder,When fitted in the positioning slots,the elastic strips,securely engage the side walls of the slots so as to prevent unintended removal of the brush holders,from the brush holder mounts

Structure for attaching brush holders to an electric power tool

An improved charging system for preventing battery deterioration and for accurate indication of the remaining battery charge level includes an electric power tool (,) and a charger (,). The electric power tool (,) is provided with an internal rechargeable batteries (,) and a second controller (,). The charger (,) is provided with circuitry for charging, a microcomputer (,), and discharge circuitry which is comprised of a manually-operated battery refreshing button (,), a discharge relay (,) and a discharge resistor (,). Upon depression of the battery refreshing button (,), the microcomputer (,) causes the batteries (,) of the electric power tool (,) to be charged to a full level and discharged to a predetermined level twice. When the two-cycle operation of full charge and discharge is completed, the second controller (,) of the electric power tool (,) updates the remaining charge level of the batteries (,).

Power tool charging system having battery reconditioning and battery capacity data updating functions

There is provided a structure (17) for preventing electrical leakage for use in an electric power tool, typically a grinder (1), encased in a split aluminum housing (2, 3, 4) and provided with a commutator motor (5), a pair of brush holders (12) each including a brush (13) pressed against the commutator (6a) of the motor, and a fan (8) driven by rotation of the commutator motor for drawing air from the outside of the electric power tool through a plurality of air inlets (9) formed in the housing. The split housing includes a removable rear cover (4) that can be detachably fitted on the grinder. The structure is a shield (17) that is provided between the brush holders and the air inlets, for blocking air drawn by the fan from the air inlets to the brush holders. The shield is a substantially symmetrical element which includes a center portion (18) clamped between the removable part and the fixed part of the housing having two side edges, a pair of arm portions (19) extending outward from the side edges of the center portion, and a pair of cover portions (20) connected to the arm portions such that the cover portions are positioned close to the brush holders to block air drawn by the fan from the air inlets to the brush holders.

Growing community of inventors

Anjo, Japan

Shinichi Nakane