JPH09174432A - Portable grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the flying of abrasive powder to a worker by openably/closably fitting a cover preventing the flying of the abrasive powder to the worker on the side face of a main body. SOLUTION: A dustproof cover 20 is provided with upper, side, and back face sections 20a, 20b, 20c, the front and bottom face sections are opened, and the upper face section 20a is fitted to the upper face of a case main body 8 via a hinge 21. The dustproof cover 20 is rotated upward and inverted on the case main body 8 while the hinge 21 serves as a fulcrum. When a grinder 4 is used, a drive wheel 9 is rotated, a tip wheel 11 is rotated and pressed to a metal material to be polished for polishing, then abrasive powder flies from a tip section, however most of the flying abrasive powder enters the gap formed by the dustproof cover 20 and the drive wheel 9 in the front of the dustproof cover 20, it is received by the front face section 20b or the back face section 20c and dropped, and its flying to a worker is prevented. The dustproof cover 20 is rotated upward and inverted, and the side face of the drive wheel 9 is opened when an abrasive belt 12 is fitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable grinder, and more particularly to a portable belt grinder which prevents abrasive powder from falling on an operator during polishing.

[0002]

2. Description of the Related Art In a conventional portable belt grinder, as shown in FIG. 5, a rubber plate 2 hanging from a lower side of a main body 1 is used.
Is installed. The rubber plate 2 is provided so as to receive the polishing powder scattered from the polishing belt 12 during the polishing work so as not to fall on the worker and to prevent the worker's clothes and the like from being soiled.

However, a considerable amount of abrasive powder comes off the rubber plate 2 and falls on the operator, and the rubber plate 2 is not so effective. In particular, the side of the rubber plate 2 (see FIG. 5)
There is a lot of abrasive powder passing through the front side. On the other hand, the other side surface of the main body (back side in FIG. 5, upper side in FIG. 6)
Has a drive unit, which obstructs the flight of the polishing powder, so that the polishing powder flying to the operator is relatively small.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above circumstances, and an object thereof is to provide a portable belt grinder capable of more reliably preventing abrasive powder from coming to an operator. .

[0005]

According to a first aspect of the present invention, a cover for preventing abrasive powder from coming to an operator is attached to a side surface of a main body so as to be openable and closable. An air outlet for ejecting air forward is formed in the handle portion of the main body.

[0006]

1, 2 to 3 show an embodiment of a portable grinder of the present invention, and in this example, an example of a portable belt grinder is shown. In these figures, 1 is a grinder main body, and 20 is a dustproof cover provided on the main body 1. The main body 1 comprises a handle portion 3 and a grinder portion 4 integrally attached to the handle portion 3. The handle portion 3 has a substantially short tubular shape as a whole and is formed in a shape that can be easily gripped by a hand.

An air intake tap 5 is provided at the base end portion 3a of the handle portion 3. Reference numeral 6 denotes a switch provided on the upper surface of the handle portion 3, and reference numeral 7 denotes a handle which is provided so as to be able to be taken in and out of the handle portion 3. A drive mechanism (not shown) is provided inside the tip portion 3b of the handle portion 3. The drive mechanism is driven by pressurized air taken in from the tap 5.

The grinder portion 4 is composed of a case 8, a drive wheel 9, a rod 10, a tip wheel 11, a polishing belt 12, etc., and a base portion 4a thereof is on one side of the tip portion 3b of the handle portion 3 (lower side in FIG. 2). Is integrally attached to. The case 8 is entirely fixed to the tip portion 3b of the handle portion 3. The drive wheel 9 is provided in the case body 8,
It is configured to be rotationally driven by the drive mechanism.
One end 10a of the rod 10 is fixed to the case body 8 and is attached so as to protrude forward. Tip wheel 1
1 is rotatably attached to the tip of a rod 10. The polishing belt 12 includes a drive wheel 9 and a tip wheel 11.
It is configured to be endlessly rotatable. Since the tip of the rod 10 is constantly pressed outward by a spring provided inside the polishing belt 12, a constant tension is always applied to the polishing belt 12.

The dustproof cover 20 is a main part of the present invention, and has an upper surface portion 20a, a side surface portion 20b and a rear surface portion 20c, and a front surface portion (left side in FIGS. 1 and 2) and a bottom surface portion are opened. There is. The upper surface portion 20a, the side surface portion 20b, and the rear surface portion 20c are connected to each other at right angles to form an integral trihedron. The side surface portion 20b is formed in a substantially square shape and is a side surface of the drive wheel 9 (front side in FIG. 1).
Cover the entire surface. The upper surface portion 20a is attached to the upper surface of the case body 8 via a hinge 21. Therefore, the dust-proof cover 20 can be rotated upward with the hinge 21 as a fulcrum and inverted on the case body 8 as shown in FIG.

To use the grinder of this embodiment, first, when the switch 6 is turned on, the drive wheel 9 rotates, the grinding belt 12 rotates accordingly, and the tip wheel 11 also rotates. In this state, when the tip portion (polishing belt 12 of the tip wheel 11) is pressed against the metal material body or the like to be ground, the metal material body is ground and the polishing powder is scattered from the portion toward the operator side. Most of the abrasive powder scattered here is
The front opening of the dust cover 20, that is, the dust cover 2
0 and the drive wheel 9 enter through a gap formed therebetween and are received by the side surface portion 20b or the rear surface portion 20c and fall down, and do not reach the worker.

When the polishing belt 12 is attached or replaced, the dust cover 20 is rotated upward as shown in FIG. 1 (c) to invert the side face of the drive wheel 9 to an open state. Do it. As a result, it is possible to easily attach or replace the polishing belt 12 as in the conventional case without being disturbed by the dust cover 20.

FIG. 4 shows another embodiment. In this example, the rubber plate 2 and the dustproof cover 20 are not used, and the blowout of the pressurized air for driving the drive mechanism is used to fly the powder to the worker. Prevent. That is, 30 is an air outlet, which is formed by opening in a laterally elongated slit shape at an appropriate position below the tip of the handle. From the air outlet 30, the air taken into the pipe in the handle 3 from the air intake tap 5 is partially separated by a pipe branch (not shown) to be injected, or used to drive a drive mechanism. After that, it is formed so as to eject the air.

The jetted air forms a fan-shaped so-called air curtain 31 which spreads slightly. The air curtain 3
1 intersects the grinding powder flying from the tip wheel 11 and pushes the grinding powder back in the direction of the blast air. Therefore, even in this example, the grinding powder does not fall on the operator side.

[0014]

【Example】

Example 1 (1) Standard of portable belt grinder Distance from central axis of drive wheel 9 to central axis of tip wheel 11: 200 mm Diameter of tip wheel 11: 25 mm Rotation speed of polishing belt 12 (max) 470 m / min (2) Dimension of dust cover Vertical of side part 20b ...... 100 mm Horizontal ...... 80 mm Horizontal of rear part 20 c ...... 40 mm Example 2 (1) Dimension of air outlet vertical ...... 5 mm horizontal ……… 20mm (2) Air pressure supplied to the air outlet ……… 5Kg / cm ²

[0015]

As described above, according to the first aspect of the present invention, the cover for preventing the abrasive powder from flying to the operator is attached to the side surface of the drive wheel portion of the main body, so that the abrasive powder is applied to the operator. It almost never gets down, and the clothes of workers are not soiled. Further, according to the third aspect of the invention, since the air blowout port for injecting air forward is formed in the handle portion, the flying of the polishing powder can be prevented in a wide range. Furthermore, since there is no cover as in the first aspect of the invention, replacement work of the polishing belt is easier than in the first aspect of the invention.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a portable grinder of the present invention.

FIG. 2 is a plan view of an embodiment of a portable grinder of the present invention.

FIG. 3 is a side view showing a state in which the cover of the embodiment of the portable grinder of the present invention is inverted and the side surface is opened.

FIG. 4 is a side view showing another embodiment of the present invention.

FIG. 5 is a side view of a conventional portable grinder.

FIG. 5 is a plan view of a conventional portable grinder.

[Explanation of symbols] 1 main body 2 rubber plate 3 handle portion 3a base end portion 3b tip portion 4 grinder portion 5 tap 6 switch 7 handle 8 case 9 drive wheel 10 rod 10a one end 11 tip wheel 12 polishing belt 20 dustproof cover 20a top surface Part 20b Side part 20c Side part 21 Hinge 30 Air outlet

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[Procedure amendment]

[Submission date] April 9, 1996

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a portable grinder of the invention.

FIG. 2 is a plan view of an embodiment of a portable grinder of the present invention.

FIG. 3 is a side view showing a state in which the cover of the embodiment of the portable grinder of the present invention is inverted and the side surface is opened.

FIG. 4 is a side view showing a plan view of another embodiment of the present invention.

FIG. 5 is a side view of a conventional portable grinder.

FIG. 6 is a plan view of a conventional portable grinder.

[Explanation of symbols] 1 main body 2 rubber plate 3 handle part 3a base end part 3b tip part 4 grinder part 5 tap 6 switch 7 handle 8 case 9 drive wheel 10 rod 10a one end 11 tip wheel 12 polishing belt 20 dust cover 20a top surface Part 20b Side part 20c Back part 21 Hinge 30 Air outlet

Claims (4)

[Claims] 1. A portable grinder wherein a cover for preventing polishing powder from coming to an operator is attached to a side surface of a main body so as to be openable and closable. 2. The portable belt grinder according to claim 1, wherein the cover is rotatably attached to the main body so as to cover the side surface and the rear surface of the drive wheel portion of the main body. 3. A portable grinder characterized in that an air outlet for ejecting air forward is formed in a handle portion of the main body. 4. A portable grinder characterized in that the air ejected from the air outlet uses the air for driving the drive mechanism of the main body.