JPH08281603A - Portable rotary tool - Google Patents

Abstract

PURPOSE: To reduce the dimension from the upper to the lower and from the front to the rear and improve operational properties by disposing the rear side of a plane including motor brushes and a driving axial center of a housing in a manner of inclining downward and installing a handle facing the direction of smaller length crossing orthogonally the place of the housing. CONSTITUTION: The rear side of a plane L1 including left and right brushes 11 and 12 and an axial center O of a driving shaft 8 of a motor 4 is so disposed as to incline downward to a horizontal surface L2 including the axial center O. In a housing 5, its length Y is smaller than the length X crossing orthogonally on the place L1 . A handle 6 is installed in a manner of facing the housing 5 in its length Y direction. As the handle 6 is disposed in the above- mentioned manner, the size of an opening 6a to accommodate the palm of human hand is secured sufficiently. Also, as the handle 6 is provided on a site close to the gravity of a rotary tool without being shifted to the rear, the propelling operation of the rotary tool at the time of cutting can be carried out in the stabilized state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable rotary tool such as a portable circular saw machine which is compact and has improved operability.

[0002]

2. Description of the Related Art As conventional portable rotary tools, those described in Japanese Utility Model Laid-Open Nos. 61-15101 and 64-9701 are known. The former is one in which a circular electric motor as viewed from the side of a rotary tool is wrapped in a housing, and a handle is attached to a portion near the upper rear of the housing. In the latter, as shown in FIG. 2, two brushes of an electric motor are arranged in front and rear when viewed from the side surface of the rotary tool, and the vertical dimension of the electric motor and the housing 1 enclosing the electric motor is reduced.

[0003]

The conventional portable rotary tool, however, has the drawback that the handle of the former portable rotary tool projects above the rotary tool main body. In the latter rotary tool, the height of the handle 2 is reduced due to the smaller vertical dimension of the housing 1, but the portion of the housing 1 that covers the brush portion does not narrow the hole 2a for holding the palm of the handle 2. It is necessary to shift the sorting handle 2a further rearward from the axis of the drive shaft of the electric motor, that is, the center of the housing 1, and the front-rear dimension of the rotary tool becomes larger accordingly. Further, there is a problem that the handle 2 is separated from the center of gravity of the rotary tool and the operability is deteriorated when cutting or the like.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the vertical and front and rear dimensions of a portable rotary tool to reduce the size and improve the operability.

[0005]

In order to achieve the above object, the present invention provides an electric motor 4 for driving a cutting tool 3, a housing 5 containing the electric motor 4, and a handle 6 attached to the housing 5. In the portable rotary tool provided with the base 7 for hitting a workpiece attached to the housing 5, the plane L ₁ including the brushes 11 and 12 of the electric motor 4 and the axis O of the drive shaft 8 is The electric motor 4 is arranged so that its rear side is inclined downward with respect to the horizontal plane L ₂ including the axis O, and the housing 5 is arranged in a direction orthogonal to the plane L ₁ rather than the length on the plane L ₁ . The handle 6 is formed to have a smaller length, and the handle 6 is attached to the housing 5 so as to face the direction in which the length is shorter.

[0006]

The housing 5 is formed such that the length in the direction orthogonal to the plane L ₁ including the brushes 11 and 12 of the electric motor 4 and the axis O of the drive shaft 8 is smaller than that on the plane L _1. Therefore, the height of the portable rotary tool is reduced accordingly.
Further, since the handle 6 faces the smaller-length portion of the housing 5 arranged so that the plane L ₁ is inclined downward on the rear side with respect to the horizontal plane L ₂ , the brushes 11, 12 of the electric motor 4 are exposed. The raised portion of the housing 5 corresponding to does not narrow the hole 6a for inserting the palm of the handle 6. Therefore, it is not necessary to shift the handle 6 to the rear of the housing 5 or to form the handle 6 high, and the height and the front-rear length of the rotary tool can be reduced accordingly. Further, since the handle 6 can be provided at a position close to the center of gravity of the rotary tool without being displaced further rearward, operability is improved in cutting work or the like. That is, the propulsion operation of the rotary tool during processing can be performed in a stable state.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, this portable rotary tool includes an electric motor 4 for driving a blade 3, a housing 5 containing the electric motor 4, a handle 6 attached to the housing 5, and a housing 5 attached to the housing 5. And a base 7 for hitting the processed material.

The blade 3 is specifically a circular saw blade, and is fixed to an output shaft (not shown) that is decelerated from a drive shaft 8 of an electric motor 4 arranged laterally via a gear. The upper and lower sides of the blade 3 are covered with a safety cover 9 and a lower guard 10, respectively, and the safety cover 9 is fixed to the housing 5, and the lower guard 10 is attached to the safety cover 9 so that it can move in and out of the safety cover 9. The base 7 is for restricting the positional relationship between the blade 3 and the material to be processed, and is attached to the housing 5 or the safety cover 9 in a positionally adjustable manner.

The electric motor 4 includes brushes 11 on the left and right,
12 so that the plane L ₁ including the axis O of the drive shaft 8 is inclined downward with respect to the horizontal plane L ₂ including the axis O, that is, the plane parallel to the plane including the bottom of the portable rotary tool. That is, it is arranged so as to be inclined in the clockwise direction in FIG. The intersection angle θ is preferably about 5 ° or more and 40 ° or less, and more preferably about 35 °. When the inclination angle θ is less than 5 °, the handle 6 is provided when the handle 6 is provided close to the base 7 which is the bottom surface of the portable rotary tool.
Does not protrude significantly from the housing 5 to the rear,
If it exceeds 0 °, the housing 5 corresponding to the brushes 11 and 12 hits the base 7, and the positions of the housing 5 and the handle 6 with respect to the base 7 become high, so that the height of the portable rotary tool becomes large and the size becomes large. Cause to cause.

The housing 5 is a portable rotary tool.
It is also the main body of the plane L ₁From length X above
Also the plane L₁Shape with a smaller length Y in the direction orthogonal to
Is formed in. That is, the short section corresponding to the length Y
Minutes are formed in a square shape and the long part corresponding to the length X bulges out.
It is formed in a curved shape with a plane L as a whole.₁Direction orthogonal to
It has a flat or crushed shape. Mochiro
However, other than this shape, for example, oval or flat polygon is adopted.
It is also possible to use.

The handle 6 is attached to the housing 5 so as to face the direction of the length Y, that is, to face the elongated portion. Handle 6 is housing 5
Is formed integrally with or is separately formed and then fixed to the housing 5 with a screw or the like, specifically, is formed in a substantially U-shape, and the respective free ends of the brushes 11 and 12 in the housing 5 are formed. It is connected to the place surrounding. Since the handle 6 is thus arranged so as to face the direction in which the length of the housing 5 is small, the hole 6 into which the palm is to be inserted is formed.
The protrusion of the housing 5 does not enter into a and the size of the hole 6a is sufficiently secured. Therefore, the handle 6 is arranged in the vicinity of the drive shaft 8 of the electric motor 4, which is the approximate center of gravity of the portable rotary tool, and its height can be made as low as possible.

[0012]

According to the present invention, the housing is formed so that the length in the direction orthogonal to the plane including the brush of the electric motor and the axis of the drive shaft is smaller than that on the plane.
Further, since the handle is attached to the long portion of the housing which is inclined by inclining the rear surface downward with respect to the horizontal plane including the axis center, the raised portion of the housing corresponding to the brush of the electric motor is The hole for inserting the palm of the handle is not narrowed, and it is not necessary to shift the handle rearward of the housing or form the handle high, and the height and the front-rear length of the rotary tool can be reduced accordingly. Further, since the handle can be provided at a position close to the center of gravity of the rotary tool without being displaced rearward, the propulsion operation of the rotary tool during machining can be performed in a stable state, and the operability is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a portable rotary tool according to the present invention.

FIG. 2 is a side view of a conventional portable rotary tool.

[Explanation of symbols]

3 ... blade 4 ... motor 5 ... housing 6 ... handle 7 ... base 8 ... drive shaft 11 ... brush O ... axis L ₁ ... plane L ₂ ... horizontal surface

Claims (1)

[Claims] 1. A portable rotary device comprising an electric motor for driving a blade, a housing containing the electric motor, a handle attached to the housing, and a base attached to the workpiece attached to the housing. In the tool, the electric motor is arranged such that the plane including the brush of the electric motor and the axis of the drive shaft inclines downward on the rear side with respect to the horizontal plane including the axis, and the housing has a length on the plane. The portable rotary tool is characterized in that the length thereof is smaller than the length in the direction orthogonal to the plane, and the handle is attached to the housing so as to face the direction of the smaller length.