Disc grinder

Abstract

To provide a disc grinder including a cover which allows a polishing disc to reach a narrow portion and can protect a hand of a worker.SOLUTION: A typical structure of a disc grinder 100 according to the invention includes: a handle 120 in which a motor is incorporated; a gear box 140 attached to a tip of the handle; a driving shaft 144 which protrudes from the gear box and is attached with a polishing disc 150; and a cover 200 which is attached to an area near the driving shaft. The cover extends from the position near the driving shaft 144 to the handle 120 side and bends toward the handle 120 so as to enclose both sides of the handle 120.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a portable disc grinder having a cover for protecting the operator's hands. [Background technology]

[0002] As part of the work process for anti-rust painting work on steel towers, the old paint film and rust on the steel are manually removed using a disc grinder (portable grinder) as part of the surface preparation (scraping) work before the painting work begins.

[0003] A wire brush or a rotary grinding wheel is used as the abrasive disc attached to the disc grinder. To prevent the worker from touching the abrasive disc, a cover is usually attached to cover the abrasive disc during work. The cover is a member that covers about half of the circumference of the abrasive disc, but depending on the object being worked on and the worker's posture at the time, the cover often gets in the way.

[0004] Patent Document 1 proposes a disc grinder in which a semicircular rail frame is attached to the grinder body and the cover can be slid forward and backward. This allows the grinder to be used by either left-handed or right-handed people.

[0005] Patent Document 2 proposes a disc grinder that removes not only the front but also the left side of the grinding wheel cover, enabling horizontal and vertical grinding. It states that by using this alternately with the horizontal grinding part of the rotating grinding wheel, cross grinding can be easily performed by simply tilting the disc grinder in hand without moving the body, and cross grinding allows the grinding part to be identified and the unevenness of the grinding surface to be identified, allowing the necessary parts to be selected and ground, making it easy to perform high-precision grinding. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5013016 [Patent Document 2] JP 2014-180743 A Summary of the Invention [Problem to be solved by the invention]

[0007] In surface preparation work on steel towers, there are many narrow areas such as around steel bolts and inside L-shaped steel. In such narrow areas, the cover hits the steel and the grinding disk cannot reach the back, making it difficult to ensure the quality of the scraping. In addition, it is inefficient because it is difficult to work in and takes a lot of time and effort.

[0008] If you were to remove the cover to work at this time, there is a risk that your fingers will get caught in the abrasive disc or that you will hit your hand against other steel materials due to kickback.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a disc grinder having a cover that allows the abrasive disc to reach tight spaces and protects the hands of the operator. [Means for solving the problem]

[0010] In order to solve the above problems, a typical configuration of a disc grinder according to the present invention comprises a handle incorporating a motor, a gear box attached to the end of the handle, a drive shaft protruding from the gear box and to which an abrasive disc can be attached, and a cover attached near the drive shaft, wherein the cover extends from near the drive shaft toward the handle and is bent toward the handle so as to surround both sides of the handle.

[0011] According to the above configuration, the cover can cover the hands of the worker instead of covering the periphery of the abrasive disc, so that the worker can easily work in narrow places without covering the periphery of the abrasive disc, and the worker's hands can be protected without interfering with the work.

[0012] The cover is preferably bent towards the gearbox so as to surround the periphery of the gearbox.

[0013] This makes it possible to protect the hands of the worker when holding the gearbox with their hands, thereby improving workability.

[0014] The cover is preferably made of a flexible resin sheet, which allows the cover to flex and thus allows the abrasive disc to reach tighter areas.

[0015] The cover is preferably made of a transparent resin sheet, which allows visual confirmation of how the abrasive disc is contacting the object during operation.

[0016] It is preferable that the portion of the cover facing the handle be doubled up with the resin sheet, which makes it possible to reinforce the cover and improve its durability. Effect of the Invention

[0017] According to the present invention, it is possible to provide a disc grinder having a cover that allows the abrasive disc to reach tight spaces and protects the hands of the operator. [Brief description of the drawings]

[0018] [Figure 1] 1A to 1C are four-sided views for explaining the configuration of a disc grinder according to the present embodiment. [Diagram 2] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific values ​​shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present invention are not shown.

[0020] Fig. 1 is a four-sided view for explaining the configuration of the disc grinder according to this embodiment, where (a) is a plan view, (b) is a side view, (c) is a bottom view, and (d) is a front view. Fig. 2 is a plan view for explaining the cover.

[0021] The disc grinder 100 shown in FIG. 1 is a portable disc grinder (hereinafter referred to as a "grinder body 110") to which a cover 200 is attached.

[0022] The grinder body 110 has a motor built in a straight handle 120. A power cord 130 is connected to the rear end of the handle 120, and a gear box 140 is provided at the tip of the handle 120. The gear box 140 reduces the speed of the motor's rotation and converts the direction of rotation to an orthogonal direction before transmitting it to a drive shaft 144. The drive shaft 144 protrudes from the center of a cylindrical boss 142 that is part of the housing of the gear box 140.

[0023] The abrasive disk 150 attached to the drive shaft 144 can be replaced with various types and sizes depending on the work. For example, a wire brush or a paper sander can be suitably used for scraping work.

[0024] As shown in FIG. 2, the cover 200 is composed of an adapter 210 for mounting on the disc grinder 100, and a sheet 220 that serves as the cover body.

[0025] The adapter 210 has a split structure, and is fixed to the boss 142 of the grinder body 110 by tightening the screw 214 that is passed through the flange 212. This allows the cover to be attached near the drive shaft. The cover 200 is an attachment type, so it can be easily attached and detached.

[0026] The seat 220 is generally boat-shaped and has a bottom surface 222 extending from near the drive shaft 144 toward the handle, side surfaces 224 bent toward the handle so as to surround both sides of the handle 120, and a front surface 226 bent toward the gear box 140 so as to surround the periphery of the gear box 140.

[0027] That is, the cover 200 does not cover the handle side of the abrasive disc 150 along the grinder body 110, but covers the abrasive disc 150 side along the grinder body 110. Since there is no cover around the abrasive disc 150 and the abrasive disc 150 protrudes, it is possible to work in narrow spaces as easily as if there was no cover.

[0028] The sheet bottom surface 222 is positioned between the abrasive disc 150 and the hand gripping the handle 120. Therefore, the worker's fingers can be protected from being caught in the abrasive disc 150. In addition, dust scattered by the abrasive disc 150 can be prevented from directly hitting the hands.

[0029] The seat side surface 224 is located on the left and right sides of the handle 120, outside the hand gripping the handle 120. Therefore, even if kickback occurs (the grinder body 110 is strongly moved in reaction to the grinding disc 150 hitting a steel material), when the hand hits another steel material, it hits through the cover 200, so the hand of the operator can be protected.

[0030] The seat front surface 226 surrounds the periphery of the gear box 140. Therefore, when the worker holds the gear box 140 with his / her hands while working, the seat front surface 226 is positioned outside the hand, so the worker's hands can be protected. The seat front surface 226 is also provided with a hole 228 for inserting a screwdriver 240 for turning the screw 214 of the adapter 210. This improves the workability of attaching and removing the cover.

[0031] The sheet 220 of the cover 200 is made of a flexible, transparent resin sheet. Because it is flexible, the cover bends when pressed against the disc grinder 100, allowing the grinding disc 150 to reach narrower areas. Also, because it is transparent, it is possible to visually check how the grinding disc is contacting the target (steel material).

[0032] In addition, a reinforcing patch 230 made of a double layer of resin sheet is attached to the seat bottom surface 222 in a position facing the handle 120. This makes it possible to reinforce the seat 220 and improve its durability.

[0033] As described above, the present invention provides a disc grinder 100 equipped with a cover 200 that allows the abrasive disc 150 to reach tight spaces and protects the operator's hands.

[0034] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. [Industrial Applicability]

[0035] The present invention can be used as a portable disc grinder equipped with a cover for protecting the operator's hands. [Explanation of symbols]

[0036] 100... disc grinder, 110... grinder body, 120... handle, 130... power cord, 140... gear box, 142... boss, 144... drive shaft, 150... grinding disc, 200... cover, 210... adapter, 212... flange, 214... screw, 220... seat, 222... bottom, 224... side, 226... front, 228... hole, 230... reinforcement patch, 240... driver

Claims

1. A handle with a built-in motor, A gear box attached to the end of the handle; a drive shaft protruding from said gear box and adapted to mount an abrasive disc; a cover attached near the drive shaft between the gear box and the abrasive disc; This disc grinder is characterized in that the cover extends from near the drive shaft toward the handle, covers the abrasive disc side of the handle, is positioned outside the hand of an operator holding the handle, and is bent to surround both sides of the handle.

2. 2. The disc grinder according to claim 1, wherein the cover is bent so as to surround the periphery of the gear box.

3. 3. The disc grinder according to claim 1, wherein the cover is made of a flexible resin sheet.

4. 3. The disc grinder according to claim 1, wherein the cover is made of a transparent resin sheet.

5. 5. The disc grinder according to claim 3, wherein the resin sheet is doubled at a position of the cover facing the handle.

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