Hitachi Koki Co., Ltd.

Teruo Imai

Kenji Niwa

Hideyuki Tanimoto

Masato Sakai

Mizuho Nakamura

Tomoyoshi Yokota

Takuya Konnai

Tomomasa Nishikawa

Masanori Okada

Takeshi Taniguchi

Yoshitaka Suzuki

Kenichirou Yoshida

Shinji Takano

Hideki Watanabe

Yoshiichi Komazaki

Kimitaka Abo

Takuma Nonaka

Taiichi Kumasaka

Satoru Gunji

Shinki Otsu

Satoshi Shimada

The invention provides a reciprocating electric tool () having a brushless motor (), a plunger (), and control means (). The plunger () is driven by the brushless motor and reciprocating between two dead centers. A end bit () is mounted to one end of the plunger in a reciprocating direction. The control means () controls a rotational speed of the brushless motor based on a position of the plunger.

Reciprocating electric tool

According to an aspect of the present invention, there is provided a portable cutting machine including: a housing; a motor; a cutting blade driven by the motor; a saw cover that covers the cutting blade; a base that rotatably supports the saw cover and to be brought into contact with the to-be-processed members; and a changing mechanism capable of changing the protrusion amount of the cutting blade toward the side opposite to the saw cover, wherein the changing mechanism has an adjustment guide extending from the base in the rotation direction of the saw cover and a movement restricting part for restricting the movement of the adjustment guide, and wherein the portion of the adjustment guide on the side farther from the base with respect to the movement restricting part is arranged outside of the saw cover.

Portable cutting machine

A portable electric cutting apparatus includes a housing for housing an electric motor rotating a saw blade, a saw cover attached to the housing, the saw cover having a shape to cover an upper half of an outer periphery, the saw cover including a saw blade housing portion at least partially housing the saw blade and a cylindrical portion having a substantially cylindrical shape, the cylindrical portion connecting to the housing at an end face of the cylindrical portion a base being joined to at least one of the saw cover and the housing, the base having an opening to allow the saw blade to project downwardly from a bottom face which is slidable on a cut material and a fan being driven by the electric motor, wherein a discharge passage forming member is provided with the saw cover so as to form a discharge passage by cooperating with a wall face of the saw cover.

Portable electric cutting apparatus

A first coil includes a first inner-coil bundle and a first outer-coil bundle. The first outer-coil bundle is positioned radially outwardly of the first inner-coil bundle in a radial direction of a stator core. A second coil includes a second inner-coil bundle and a second outer-coil bundle. The second outer-coil bundle is positioned radially outwardly of the second inner-coil bundle. A first inner-coil end and a first outer-coil end form a gap and a groove. A second inner-coil end and a second outer-coil end also form a gap and a groove.

Electric tool having electric motor with first and second coils having first and second coil bundles of different innermost peripheral length

In a circular saw, an end plate provided on an end of a rotor core has a cylindrical shaft insulator and a plate extending radially from the shaft insulator. The plate is disposed at a position separated from the end of the rotor core. The plate includes slot parts, and air holes that penetrate the plate in the axial direction of the rotor shaft at areas adjacent to the rotor shaft. Protruding parts are provided on the shaft insulator on both sides of each air hole, extending in the axial direction of the rotor shaft and protruding radially outward with respect to the rotor shaft. The shaft insulator has an outer diameter Dthat is smaller than a diameter Dof the plate in the slot parts adjacent to the rotor shaft.

Electric motor and electric tool having the motor

An outer peripheral surface of a cam has an apex disposed of distance from a rotational axis, a first region adjacent the apex opposite to the direction of rotation that increases in distance from the rotational axis during rotation, and a second region adjacent the apex in the rotational direction that decreases in distance from the rotational axis of the cam with the rotation thereof. The apex is disposed where the phase &#x3b8; thereof advances by 15 degrees and 55 degrees or less in the rotational direction from a position symmetrical to the rotational axis. The rate of change between the second region and the rotational axis is greater than the rate of change between the first region and the rotational axis. A retreat amount X when a saw blade reaches an uppermost point c from a foremost point is set to 0.8 mm.

Jigsaw

A portable cutting tool includes a base and a tool main body which are inclinably connected such that a saw blade can be projected from a vicinity of an intersection between a side face of the base and a lower face of the base. A parallelism between the saw blade and the side face of the base is made to be able to be adjusted.

Portable cutting tool

A portable electric cutting apparatus includes a housing for housing an electric motor for rotating a saw blade a fan provided in the housing and driven by the electric motor, a saw cover attached to the housing and having a saw blade housing part having a shape to cover an upper half of the outer periphery of the saw blade for housing a part of the saw blade, a base formed with an opening for allowing the saw blade to project downward from a bottom face which is slidable on a cut material. A discharge passage for discharging a fan wind produced by driving the fan is formed along an outer periphery of the saw cover. The fan wind is discharged through the discharge passage toward a front side of the base in the cutting direction.

Fanned air generated by a fan to cool a motor is discharged from a housing through fanned air discharge ports toward an opening formed in a base. The fanned air discharged toward the opening is then introduced into a groove in fluid communication with the opening. The groove is formed in a bottom surface of the base and has an open side at a front side of the base. The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

Growing community of inventors

Ibaraki, Japan

Teruo Imai