JPH09324526A - Suction type portable grinding machine and skirt member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To grind sections up to the edges of a wall and an obstruction, to attain a labor reducing effect by sucking a grinding machine onto a surface to be ground, to move the grinding machine lightly and easily on the surface to be ground under the state, in which proper suction force is maintained, and to prevent the damage of a skirt member. SOLUTION: This suction type portable grinding machine has a cover 2 covering a discoid rotary cutter 1 and an annular skirt member 3, which is sheathed onto the peripheral side face of the cover 2 and in which a lower end 3a is abutted against a surface to be ground 4 at the time of grinding works. The cover 2 has an elastic material 5 elastically projecting the skirt member 3 against the surface to be ground 4 at the time of grinding works at that time. The skirt member 3 has hooks 6 engaged with the top face of the cover 2 and used for preventing slipping-off. The skirt member 3 is sheathed to the cover 2 vertically movably under the state, in which a space D between the lower end 3a of the skirt member 3 and the lower end 2b of the cover 2 is opened slightly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction-type portable grinder that removes a coating film or the like from a surface such as a wall or floor while sucking dust generated during grinding. More specifically, it is light and easy to operate. The present invention relates to a suction type portable grinding machine formed and a skirt member used in this grinding machine.

[0002]

2. Description of the Related Art A conventional grinding machine of this type is shown in FIG.
As shown in FIG. 0A, it includes a cover 2 for covering the dish-shaped rotary cutter 1, and an annular skirt member 3 which is mounted on the peripheral side surface of the cover 2 and whose lower end 3a abuts the surface to be ground 4 during the grinding operation. (For example, Japanese Patent Laid-Open No. 7-21
See Japanese Patent No. 7185, hereinafter referred to as Conventional Example A).

Further, conventionally, as shown in FIG. 1B, there is also known one having a cover 2 in which a brush a is planted in an annular shape (hereinafter referred to as a conventional example B).

[0004]

By the way, this type of grinding machine can improve the working environment in that dust generated during the grinding work can be removed, but the suction action causes a negative pressure in the cover. It is inevitable that a great amount of power will be needed. Therefore, it is desirable that this kind of grinding machine is formed so that it can be moved lightly and easily on the surface to be ground without lowering the suction force.

Further, in the case of this type of grinder, the rotary cutter is hidden by the cover and cannot be visually recognized directly. Therefore, if the diameter of the cover is selected large, it is possible to accurately grasp and grind the place to be ground, or to grind the wall or an obstacle. It becomes difficult to grind to the last minute. Therefore, in this kind of grinding machine, the diameter of the cover is selected to be slightly larger than the diameter of the rotary cutter, and in this case, it is desirable that the skirt member is not scraped by the rotary cutter.

However, in the case of the conventional example A, although the height of the skirt member can be adjusted by using the inclined slit and the suction state can be adjusted so that the grinding machine can be moved easily, the skirt member is fixedly formed on the cover. , As the rotary cutter bites into the surface to be ground, and the unevenness of the surface to be ground inevitably increases the contact resistance with the surface to be ground, and the skirt member sucks the surface to be ground like a suction cup. It was easy to get along.

As a result, when this conventional product is used, the suction force is increased, and a large force is required to slide the grinder, and the labor required to press the grinder against the surface to be ground by utilizing the suction action. There is a problem that the labor reducing effect of this type of grinding machine is small. Further, in the case of this conventional product, since the distance between the lower end of the skirt member and the lower end of the cover is selected to be large, it is inevitable that the skirt member bends inward, and the rotary cutter is likely to damage the skirt member. There was a point.

In the case of the conventional example B, since the brush is provided, the contact resistance with the surface to be ground is small,
In order to prevent the brush from being cut with a rotary cutter, the diameter of the cover was large and the air permeability was high, so the suction power was weak. As a result, when this conventional product is used, there is a problem that it is not possible to grind to the edge of a wall or an obstacle, and it is not possible to greatly reduce the labor required to press the grinder against the surface to be ground.

The present invention is to solve such a problem of the conventional product. Therefore, the technical problem of the present invention is that it is possible to grind to the very limit of a wall or an obstacle and to reduce the labor by adhering the grinder to the surface to be ground. A skirt used for this type of grinding machine, which can be moved lightly and effortlessly on the surface, and which can be moved up and down along the cover without falling off from the suction type portable grinding machine formed so as to prevent damage to the skirt member. It is to provide a member.

[0010]

The present invention employs the following technical means to solve the above-mentioned problems. That is, the present invention comprises a cover 2 for covering the dish-shaped rotary cutter 1, and an annular skirt member 3 which is mounted on the peripheral side surface of the cover 2 and whose lower end 3a abuts the surface 4 to be ground during a grinding operation. In the suction type portable grinding machine, the cover 2 is provided with an elastic material 5 that elastically pushes the skirt member 3 to the surface 4 to be ground during the grinding operation, and the skirt member 3 covers the cover 2
A hook 6 that is locked to the upper surface of the skirt member 3 to prevent the skirt member 3 from falling off, and a distance D between the lower end 3a of the skirt member 3 and the lower end 2b of the cover 2 is slightly opened,
It is characterized in that the skirt member 3 is mounted on the cover 2 so as to be vertically movable.

The elastic material 5 includes leaf springs, coil springs, natural rubber, synthetic rubber and the like. Of these, a leaf spring or rubber is preferable because it is relatively easy to attach and the cover 2 can be formed at low cost.

When the elastic material 5 is a leaf spring, the base end portion 5
The a is fixed to the upper surface of the cover 2, and the tip portion 5b is projected from the upper surface of the cover 2 in an eaves shape. When the elastic material 5 is made of rubber, it is provided at a position above the outer peripheral surface of the cover 2.

As the skirt member 3 used in the grinding machine of the present invention, there is one having a hook 6 which is locked to the upper surface of the cover 2 to prevent the skirt member 3 from falling off. In this case, the skirt member 3 is preferably formed of synthetic rubber or soft synthetic resin so as to absorb and relax impacts and vibrations from the surface to be ground 4.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. Reference numeral 1 is a dish-shaped rotary cutter, and 2 is a cover made of synthetic resin for covering the rotary cutter 1. Around the outer periphery of the lower surface of the rotary cutter 1, a sintered body 1a of diamond, for example, is provided at regular intervals in the circumferential direction.
Is brazed. Reference numeral 3 is an annular skirt member which is mounted on the peripheral side surface of the cover 2 and whose lower end 3a abuts the surface to be ground 4 during the grinding operation.

The cover 2 is provided with an elastic material 5 that elastically repels the skirt member 3 on the surface 4 to be ground during the grinding operation. In this embodiment, a leaf spring is used as the elastic member 5, and the base end portion 5a includes a pair of left and right bending pieces 5a ₁ as shown in FIG. The leaf spring as the elastic member 5 is fixed to the upper surface of the cover 2 after the bending piece 5a ₁ is inserted into a pair of slits 2a formed on the upper surface of the cover 2 and then bent inward, for example. It
Further, as shown in FIGS. 1 and 2, this leaf spring is arranged in a state in which the tip portion 5b is projected from the upper surface of the cover 2 in an eaves shape. As shown in FIG. 4, a total of three leaf springs serving as the elastic members 5 are arranged at equal intervals in the circumferential direction of the cover 2 in this embodiment.

The skirt member 3 is made of synthetic rubber in this embodiment, and is provided with a hook 6 which is engaged with the upper surface of the cover 2 to prevent the skirt member 3 from falling off. As shown in FIG. 6, the hook 6 is, for example, a thin metal plate whose upper portion 6 a is bent in accordance with the slope of the upper surface of the cover 2. The lower portion 6b of the hook 6 is provided with a pair of left and right bending pieces 6b ₁ .

Reference numeral 3b (see FIG. 6) is a pair of left and right slits formed in the skirt member 3. Above hook 6
The pair of left and right bent pieces 6b ₁ are formed in the slit 3b.
Is inserted from the inside of the skirt member 3 and is fixed to the skirt member 3 by being bent inward, for example.
In this embodiment, three hooks 6 are arranged at equal intervals in the circumferential direction of the skirt member 3.

As shown in FIGS. 1 and 2, the skirt member 3 is movable up and down on the cover 2 with a space D between the lower end 3a and the lower end 2b of the cover 2 being slightly opened. It will be exterior. In this embodiment, the distance D is selected as the height of the diamond sintered body 1a. In the present invention, the distance D is not limited to this, and the point is that it can be moved up and down along the peripheral side surface of the cover 2 in a state where the lower portion of the skirt member 3 does not bend inward and outward during grinding work. It should be in the range.

Reference numeral 7 (see FIG. 3 etc.) is a connecting portion of the suction hose 8, 9 (see FIG. 1) is a rotary shaft, and 10 is a nut for fixing the rotary cutter 1 to the rotary shaft 9.

Next, the operation of the present invention will be described. In the case of the present invention, the skirt member 3 is pressed against the ground surface 4 by the elastic material 5. Therefore, during grinding work, the surface to be ground 4
The force applied from the skirt member 3 to the skirt member 3 is absorbed and received by the elastic member 5.

When carrying, the hook 6 of the skirt member 3
Locks onto the upper surface of the cover 2. Therefore, the skirt member 3
Is mounted on the cover 2 so as to be vertically movable without coming off from the cover 2. When the skirt member 3 is worn down, for example, until the lower end 3a of the skirt member 3 substantially coincides with the lower end 2b of the cover 2, the worker pushes the hook 6 outward to release the engagement state with the upper surface of the cover 2. Next, the skirt member 3 is pulled down below the cover 2 and removed to replace it with a new one.

In the above process, according to the present invention, the leaf spring as the elastic member 5 is in a state in which the tip portion 5b is exposed to the outside inside the upper surface of the cover 2 as shown in FIG. It may be arranged in. In this case, since the leaf spring exposes only the tip portion 5b to the outside as compared with the above example, there is an advantage that the appearance is good and corrosion can be prevented correspondingly.

In the case of the present invention, the elastic member 5 is not limited to the leaf spring as in the above example, but may be made of rubber as shown in FIG. In this case, as shown in FIG. 2B, the rubber as the elastic member 5 is covered by the cover 2
Is provided at a position above the outer peripheral surface of the. In this case, elastic material 5
A plurality of rubbers may be provided at regular intervals as in this embodiment, or may be annularly provided over the circumferential direction of the cover 2.

Further, in the case of the present invention, the hook 6 may be integrally molded with the skirt member 3 as shown in FIG. 9 with synthetic rubber or the like.

[0025]

As described above, the present invention provides a cover,
The skirt member is provided with the elastic material and the hook formed as described above, and the skirt member is mounted on the cover so as to be movable up and down with a slight gap between the lower end of the skirt member and the lower end of the cover. It becomes.

Therefore, in the case of the present invention, it is possible to grind to the edge of a wall or to the very end of an obstacle, and it is possible to prevent the lower part of the skirt member from bending inward during the grinding work. It is possible to prevent it, and also to reduce the labor by adsorbing the grinding machine to the surface to be ground, and it is possible to slide lightly and easily on the surface to be ground while maintaining an appropriate suction force. Has an excellent effect of facilitating

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part taken along the line II of FIG.

FIG. 2 is a sectional view of an essential part of the grinding machine of the present invention.

FIG. 3 is a perspective view of a main part of the above grinding machine.

FIG. 4 is an exploded perspective view showing a cover and a skirt member.

FIG. 5 is an exploded perspective view of essential parts showing a cover and an elastic material.

FIG. 6 is an exploded perspective view of essential parts showing a skirt member and a hook.

FIG. 7 is a longitudinal sectional view of a main part showing another embodiment of the cover.

FIG. 8 shows still another embodiment of the cover, where A is a plan view and B is an enlarged cross-sectional view of a main part taken along line BB of A.

FIG. 9 is a perspective view of a main part showing another embodiment of the skirt member.

10A and 10B show a conventional example, in which A is a front view of a main part with a part cut away, and B is a longitudinal sectional view of the main part.

[Explanation of symbols]

 1 rotary cutter 2 cover 2b lower end 3 skirt member 3a lower end 4 surface to be ground 5 elastic material 6 hook D spacing

Claims (4)

[Claims] 1. A suction type portable grinding machine comprising: a cover for covering a dish-shaped rotary cutter; and a ring-shaped skirt member which is mounted on a peripheral side surface of the cover and has a lower end abutting a surface to be ground during a grinding operation. , The cover is provided with an elastic material that elastically repels the skirt member on a surface to be ground during a grinding operation,
The skirt member is provided with a hook that locks onto the upper surface of the cover to prevent the skirt member from falling off, and the skirt member is slightly spaced from the lower end of the skirt member. A suction-type portable grinding machine, characterized in that it is mounted on a cover so that it can move up and down. 2. The elastic material is a leaf spring, and the leaf spring has a base end portion fixed to an upper surface of the cover and a tip portion protruding from the upper surface of the cover in an eaves shape. The suction type portable grinding machine according to claim 1. 3. The suction type portable grinding machine according to claim 1, wherein the elastic material is made of rubber, and the rubber is provided at a position above the outer peripheral surface of the cover. 4. A skirt member for use in the suction type portable grinding machine according to claim 1, comprising a hook for locking the skirt member on the upper surface of the cover to prevent the skirt member from falling off. A skirt member.