JPH10272622A - Hand cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the collection rate of dust by adding a simple mechanism. SOLUTION: A rearward scattering prevention plate 12 disposed almost on the same straight line position of a cutter plate 3 and having the thickness of almost the same as that of the cutter plate 3 and the height almost equal to the cutting depth of the cutter plate is set on the rear of a dust suction hole 8a of a fan casing 8 storing an exhaust fan 6 rotating linked with the rotation of the cutter plate 3. The upper end of the rearward scattering prevention plate 12 is supported to be rocked on the lower section of the fan casing 8 through a pin 14 and protrudingly urged at all times in the vertical direction by the spring force of a coil spring 16 disposed around the pin 14 and also inclined to the back side by the interference with a material W to be cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand cutter, and more particularly, to a hand cutter having an enhanced dust absorbing function.

[0002]

2. Description of the Related Art Hand cutters used for hanging work are used to make cuts having a depth of about several centimeters on concrete surfaces, stone surfaces, etc., at the boundaries of the suspension. After that, hanging work has been carried out.

[0003] In this hanging work, when forming a groove-like cut with a hand cutter, considerable dust is scattered, and the working environment is deteriorated. In particular, when this kind of work is performed indoors, The effect on equipment installed in the room, for example, electronic equipment such as a telephone, a facsimile, and a computer becomes extremely large.

[0004] For this reason, such construction requires preparation work such as surrounding curing and movement of equipment, and requires a great deal of trouble for cleaning after the construction. . Therefore, in the related art, for example, an electric hand cutter having a dust suction function shown in FIG. 3 has been used for this type of construction.

The hand cutter shown in FIG.
A gearbox 2a provided at the tip of the motor 1, an output shaft 2 whose rotation direction is changed by 90 degrees by the gearbox 2a, a cutter blade 3 detachably connected to the output shaft 2, and a cutter blade. 3, a dust suction exhaust fan 6 connected to the output shaft 2 via a pair of pulleys 4 and a belt 5, and a cutter blade 3.
From the upper side to the rear side of the blade cover 7, and a fan casing 8 integrated with the rear part of the blade cover 7 and accommodating the exhaust fan 6.

In the hand cutter of this configuration, the opening of the bottom surface of the fan casing 8 is used as a dust suction port 8a, and the bottom surface is pressed against the surface of the workpiece W while the cutter blade 3 is pressed.
Is rotated, and the dust blown rearward is sucked and collected in the dust suction port 8 as shown by the arrow.

An exhaust pipe 8b protrudes from the rear side of the fan casing 8. The exhaust pipe 8b is connected to an unillustrated dust suction hose, dust collection bag, or the like via a connection attachment 9, and is collected. Prevents dust from scattering outside as much as possible.

In the drawings, reference numeral 10 denotes a handle fixed on the cover 7 for supporting the cutter by hand, and 11 denotes an electric cord connected to the rear of the motor 1.

[0009] However, even with this structure, it is not possible to collect all dust, and there are technical problems described below.

[0010]

That is, when a cut is formed by a hand cutter, as the cutting progresses, for example, the actual size is set according to the thickness and the cut depth of the cutter blade 3 as shown in the figure. A cutting groove W1 having a width of about 3 mm and a depth of about 35 mm is formed.

Most of the dust generated at this time is wound up toward the dust suction port 8a located immediately after the cutter blade 3, and is sucked into the fan casing 8 through the dust suction port 8a.

However, part of the dust travels along the gap between the cutting grooves W1 as shown by the arrow in the figure, and
In practice, the dust collection rate is not about the entire amount generated, but is about 80 to 90% at the most, since it is blown to the rear.

Therefore, conventionally, the cutter blade 3
To prevent splashing, and to follow up with a vacuum cleaner, all of which were cumbersome and time-consuming.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a hand cutter in which the dust collection rate is improved by adding a simple mechanism.

[0015]

In order to achieve the above object, the present invention provides a cutter blade that rotates in connection with a motor, a cutter blade that is disposed at a rear side of the cutter blade, rotates in connection with the cutter blade, and In a hand cutter including an exhaust fan for sucking dust generated by a cutting operation of the cutter blade and a fan casing accommodating the exhaust fan, the cutter blade is provided at a rear side of a dust suction port of the fan casing. And a rear scattering prevention plate which is vertically installed so as to protrude downward on the same line as that of the cutter blade and which fits into a cutting groove of the cutter blade. According to this configuration, a part of the dust that tends to flow rearward collides with the rearward scatter prevention plate, rebounds, and is sucked into the suction port of the fan casing. The plate also has a steering function for maintaining the straightness in the cutting direction. The rear scatter prevention plate is swingably supported, and may be attached via spring means for urging the rear scatter prevention plate to return to the vertical position when the rear scatter prevention plate oscillates. it can. According to this configuration, at the start of cutting, when the cutter blade cuts in the depth direction, the rear scattering prevention plate swings upward to smoothly cover the cutter without interfering with the bottom surface. It can be installed on the cutting surface,
If hard cutting particles or the like hit the rear-scattering prevention plate during the cutting process, it also swings upward and escapes the impact, so that the cutting process is not hindered. In the hand cutter, guide rollers may be provided on both sides of the installation surface of the cutter blade with respect to the workpiece. This configuration is suitable for maintaining the stability of the left and right tilt directions during the cutting operation. On the side of the blade cover that covers the periphery of the cutter blade,
Attaching the two outer covers together, and on the mating surface of the blade cover and the outer cover,
According to the arrangement position of the cutter blade, a packing colored differently from the cover can be interposed. According to this configuration, it is possible to prevent dust from being scattered to the outer surface of the cutter blade, and to form the cutting groove accurately by aligning the packing with the cutting mark line previously drawn on the surface of the workpiece. Can be.

[0016]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Figure 1
2 shows an embodiment of the hand cutter according to the present invention. The hand cutter shown in the figure is of an electric type, and in each figure, the same or corresponding parts are denoted by the same reference numerals, and different members or only newly added members are different. The description is given with reference numerals.

The hand cutter shown in FIG.
A gearbox 2a provided at the tip of the motor 1, an output shaft 2 whose rotation direction is changed by 90 degrees by the gearbox 2a, a cutter blade 3 detachably connected to the output shaft 2, and a cutter blade. 3, a dust suction exhaust fan 6 connected to the output shaft 2 via a pair of pulleys 4 and a belt 5, and a cutter blade 3.
From the upper side to the rear side of the blade cover 7, and a fan casing 8 integrated with the rear part of the blade cover 7 and accommodating the exhaust fan 6.

Also, on the rear side of the fan casing 8,
An exhaust pipe 8b is protruded, and a dust suction hose (not shown), a dust collection bag, and the like (not shown) are connected to the exhaust pipe 8b via a connection attachment 9.

Further, on the upper end side of the blade cover 7,
A handle 10 is fixed, and an electric cord 11
Are connected, and such a basic shape and configuration are
This is almost the same as the conventional hand cutter shown in FIG.

In addition to the above configuration, in the present embodiment, the fan blade 8 is disposed at the rear portion of the dust suction port 8a at the same linear position as the cutter blade 3 and has a thickness substantially equal to the thickness of the cutter blade 3. The rear scatter prevention plate 12 having a height substantially equal to the cutting depth is disposed.

The side surface of the rear scatter prevention plate 12 is in the form of an oval flat cam with a greatly rounded lower portion, and the upper end thereof is provided at the lower portion of the fan casing 8 with a pin 14.
, And is configured to be swingable in the same plane as the cutter blade 3.

The rear scatter prevention plate 12
1 is always urged by a spring force of a winding spring 16 arranged around the pin 14 to be in a vertical position as shown by a solid line in FIG. 1 and interferes with the workpiece W. As a result, as shown by the broken line in FIG. 1, it is rotated upward on the rear side and inclined, and when there is no interference, the spring 16 returns to the vertical position.

On the other hand, a pair of guide rollers 18 that roll in contact with the installation surface for the workpiece W are disposed on both upper side surfaces of the dust suction port 8a. This guide roller 18
It has a guide function to prevent left and right inclination during cutting.

FIG. 2 shows a side view of the blade cover 7.
As shown in the figure, the two outer covers 20 are attached together to prevent scattering of dust on the outer side surface, and at the joint between the blade cover 7 and the outer cover 20, the position of the cutter blade 3 is set. In the places corresponding to, as shown enlarged in a part of the same figure,
A red packing 22 having a thickness of about 2 mm is interposed, and the red packing 22 is aligned with a cutting mark drawn on the workpiece W, thereby forming a cutting guide.

In the above configuration, at the stage where the cutting groove has not yet been formed at the start of cutting, the rear scatter prevention plate 12 is used until the dust suction port 8a lands on the surface of the workpiece W.
Is tilted backward against the spring pressure of the winding spring 16 to prevent interference with the surface.

When the cutting groove W1 is formed to some extent, and thereafter cutting of a certain depth starts, the rear scatter prevention plate 12
It returns to the vertical position by the spring pressure, fits into the cut groove W1, cuts out almost to the cutting depth, closes the rear part of the cut groove W1, and thereafter the same posture until the target cutting position is almost reached. Hold.

In this state, a part of the wound dust tends to flow backward in the cutting groove W1 due to the cutting operation of the cutter blade 3, but the rear scattering prevention plate 1
1 and is rebounded as shown by the arrow in FIG. 1, and almost the entire amount thereof is sucked into the fan casing 8 through the dust suction port 8 a.

In this case, if there is dust accumulated on the bottom surface of the cutting groove W1 or the like, the dust is pushed toward the dust suction port 8a by the rear scattering prevention plate 12 as the cutting proceeds, so that the inside of the cutting groove W1 is removed. Dust remaining on the plate 1
Almost wiped out after 2 passes.

Further, since the rear scatter prevention plate 12 is fitted into the cutting groove W1, a steering function for maintaining the straightness of the cutting operation of the cutter blade 3 is also provided.

In particular, when hard particles such as crushed stones collide, the rear scatter prevention plate 12 tilts backward against the spring pressure due to the impact, so that interference with this can be avoided. It does not hinder cutting progress.

Further, at the same time as the above operation, the operation is performed while the left and right guide rollers 18 are in contact with the surface of the workpiece W on the left and right of the cutting groove W1, so that smooth movement can be performed, and The inclination is also restricted, and a stable cutting operation can be performed in both the traveling direction and the vertical direction.

[0032]

As is apparent from the above description, the hand cutter according to the present invention has the following effects.

Dust flowing toward the rear side of the cutting groove collides with the rear scattering prevention plate and is repelled, and almost all of the dust is sucked into the fan casing through the dust suction port. Efficiency can be improved.

The rearward scatter prevention plate has a steering function for maintaining straightness, and also improves the continuity in the cutting direction.

According to the second aspect of the present invention, it is possible to prevent the rear scattering prevention plate from interfering with the installation surface at the initial stage of cutting, and to prevent the cutting progress when hard particles collide with the rear scattering prevention plate. Inhibition can be prevented.

According to the third aspect of the present invention, the left and right inclination during the cutting operation is also restricted.

According to the configuration of the fourth aspect, it is possible to prevent the scattering of the dust in the flash report, and it is possible to perform accurate cutting by aligning the packing with the cutting mark line of the workpiece.

The various effects described above can be achieved only by adding a simple configuration without modifying the main part of the existing hand cutter.

[Brief description of the drawings]

FIG. 1 is a side view of an electric hand cutter according to the present invention.

FIG. 2 is a front view including the same enlarged portion.

FIG. 3 is a side view of a conventional hand cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Output shaft 3 Cutter blade 6 Exhaust fan 7 Blade cover 8 Fan casing 12 Rear scattering prevention plate 14 Pin 16 Winding spring (spring means) 18 Guide roller 20 Outer cover 22 Red packing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B27G 3/00 B27G 3/00 C (72) Inventor Katsunori Komura 10-12 Higashihonuracho, Minami-ku, Hiroshima-shi, Hiroshima, Japan Stock Company Inside the construction

Claims (4)

[Claims] A cutter blade that rotates in connection with a motor; and a cutter blade that is disposed at a rear side of the cutter blade, rotates in connection with the cutter blade, and sucks dust generated by a cutting operation of the cutter blade. In a hand cutter having an exhaust fan for dust suction and a fan casing containing the exhaust fan, a hand cutter is provided at a rear side of a dust inlet of the fan casing so as to be coaxial with the cutter blade and protrude downward. A hand cutter provided with a rear scatter prevention plate which is provided and fits into a cutting groove of the cutter blade. 2. The rear scatter prevention plate includes a spring means which is swingably supported, and which urges the rear scatter prevention plate to return to the vertical position when the rear scatter prevention plate oscillates. The hand cutter according to claim 1, wherein the hand cutter is attached via a hook. 3. The hand cutter according to claim 1, wherein guide rollers are provided on both sides of an installation surface of the cutter blade with respect to the workpiece. 4. An outer cover is attached to a side surface of a blade cover that covers the periphery of the cutter blade in a two-piece manner, and a mating surface of the blade cover and the outer cover corresponds to an arrangement position of the cutter blade. The hand cutter according to any one of claims 1 to 3, wherein a packing colored differently from the cover is interposed.