Disc-type electric grinder auxiliary tool

Abstract

The present invention provides a disc-type electric grinder aid that prevents or minimizes the occurrence of steps when cutting a cylindrical handrail along its outer circumference using a disc-type electric grinder. [Solution] A disc-type electric grinder auxiliary device 2 that can be retrofitted to a disc-type electric grinder 1, comprising a contact member that can contact and press against the object to be cut, and a mounting member for attaching to the electric grinder, wherein the contact member is provided with an opening for the disc.

Description

Technical Field

[0001] The present invention relates to an accessory for a disc-type electric grinder. More specifically, the present invention relates to an accessory for a disc-type electric grinder used as a tool for an object to be cut when using a disc-type electric grinder.

Background Art

[0002] A disc-type electric grinder is a power tool that operates a motor by electricity and rotates a disc (disk) to cut an object (Patent Documents 1 and 2). Among disc-type electric grinders, hand-held types are portable and can be used in various places, so they are highly convenient and widely used. Hereinafter, when abbreviated as "electric grinder" or "grinder", it is used to refer to a disc-type electric grinder.

[0003] By the way, there is an opportunity to cut a metal handrail using a hand-held grinder. That is, on a ship, a handrail for preventing falls is provided on the outer periphery of the deck. This handrail may be partially corroded due to the adhesion of seawater or the like. Since this corroded part may lead to an accident if left unattended, it needs to be repaired. However, since this handrail cannot be disassembled, parts cannot be replaced, etc., and it is necessary to repair it as it is. At the time of this repair, an operation is performed to cut a certain range including the corroded part with a hand-held grinder and to supplement and repair it with a new metal post.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] The inventor's job involves repairing railings on automobile and other transport ships. These ships can be at sea for extended periods, ranging from several days to several months, during which time the inventor performs railing repairs as part of his duties. When repairing a handrail, a certain area including the corroded portion is removed, a replacement metal component is inserted into the removed area, and the repair is welded. In other words, it is necessary to cut both sides of the corroded area and remove a certain portion of the handrail.

[0006] On the other hand, hand-held grinders have a relatively small disc radius, making it impossible to cut a handrail in half with a single stroke. In addition, handrails are cylindrical in shape to make them easier to grip. Given these circumstances, when cutting, the disc will be applied almost perpendicularly to the outer circumference of the handrail, making partial cuts as it goes around the entire circumference. This cutting process will be carried out on both sides of the corroded section.

[0007] Naturally, grinder discs are used for cutting metal, and this is a dangerous task. Therefore, when performing cutting work, the process must be carried out slowly and carefully, rotating the disc while keeping it against the handrail. During this process, the grinder often shifts slightly from side to side due to vibration, which can cause a step to form on the cut surface. After leveling this step on the cut surface, a new metal component is applied to the cut area and welded, completing the repair work.

[0008] The inventor had a problem with this series of operations: the step in the cut surface that occurred during the aforementioned cutting process. When leveling the unevenness of a cut surface, for example, if you repair five corroded areas in a day, you will need to level 10 cut surfaces. Since leveling takes about 5 minutes, that alone will take about 50 minutes. If this is done over several days, it will amount to an enormous amount of time, several hours or even more than ten hours. The inventor believed that even simply eliminating or reducing the frequency of the smoothing process on the cut surface would result in significant time savings, as well as reduced burden on workers and lower risk, making it extremely useful.

[0009] Against the backdrop of the above circumstances, the present invention aims to develop a disc-type electric grinder auxiliary tool that prevents or minimizes the occurrence of steps when cutting a cylindrical handrail along its outer circumference using a disc-type electric grinder. [Means for solving the problem]

[0010] As a result of diligent research, the inventor conceived of a tool for cutting objects that can be retrofitted to a disc-type electric grinder, and thus completed the invention.

[0011] The present invention consists of the following configuration. [1] A disc-type electric grinder auxiliary device that can be retrofitted to a disc-type electric grinder, A contacting member that can be pressed against and into contact with the object to be cut, Mounting member for attachment to electric grinder, A disc-type electric grinder auxiliary tool characterized by being made of [a specific material]. [2] The disc-type electric grinder auxiliary tool according to [1], wherein the support member is L-shaped, U-shaped, polygonal, semicircular, semi-elliptical, or any one of these shapes. [3] The disc-type electric grinder auxiliary tool according to [1], wherein the support member has a constant width (width) in the vertical direction and a constant width (outer circumference, height) in the horizontal direction with respect to the disc plane. [4] The disc-type grinder aid described in [3], wherein the width is 10.0 to 30.0 cm. [5] The disc-type grinder aid described in [3], wherein the vertical width is 6.0 to 20.0 cm. [6] The disc-type electric grinder auxiliary tool according to [1], wherein the support member has a gripping portion. [7] The gripping portion is formed as a substantially rectangular cutout [6] Disc-type electric grinder auxiliary device [8] The auxiliary device for a disc-type electric grinder according to [1], wherein the mounting member has mounting screw holes for attaching to a grinder, and is fixed to a disc-type electric grinder by screws. [9] The disc-type electric grinder auxiliary tool according to [1], wherein the support member has an extension support screw hole for extending the vertical width of the support member.

[10] The mounting member has at least one screw hole for mounting (mounting screw hole) and is fixed to the disc-type electric grinder by screw, as described in [1].

[11] The disc-type electric grinder auxiliary tool according to any one of [1] to

[10] , wherein the support member has an opening for exposing the disc on the inner side of the support member. [Effects of the Invention]

[0012] The present invention makes it possible to provide a disc-type electric grinder auxiliary tool that prevents or minimizes the occurrence of steps when cutting a cylindrical handrail along its outer circumference using a disc-type electric grinder. [Brief explanation of the drawing]

[0013] [Figure 1] A diagram showing a disc-type electric grinder 1 equipped with a disc-type electric grinder auxiliary tool that has an opening. [Figure 2] A diagram showing an example of a disc-type electric grinder auxiliary tool 2 with an opening. [Figure 3]A figure showing, as a perspective view, the state of cutting a cylindrical handrail using a disk-type electric grinder 1 of the type having an opening. [Figure 4] A figure showing, as a cross-sectional view, the state of cutting a cylindrical handrail using a disk-type electric grinder 1 of the type having an opening. [Figure 5] A figure showing an example of a disk-type electric grinder accessory 2' of the type not having an opening. [Figure 6] A figure showing, as a perspective view, the state of cutting a cylindrical handrail using a disk-type electric grinder 1' of the type not having an opening. [Figure 7] A figure showing another example of a disk-type electric grinder accessory. [Figure 8] A figure showing the appearance etc. of a prototype example 1 of a disk-type electric grinder accessory. [Figure 9] A figure showing the appearance etc. of a prototype example 2 of a disk-type electric grinder accessory. [Figure 10] A figure showing the appearance etc. of a prototype example 3 of a disk-type electric grinder accessory. [Figure 11] A figure showing the appearance etc. of a prototype example 4 of a disk-type electric grinder accessory.

Embodiments for Carrying out the Invention

[0014] The disk-type electric grinder accessory of the present invention will be described in detail.

[0015] The disk-type electric grinder accessory of the present invention is a disk-type electric grinder accessory that can be attached to a disk-type electric grinder as a retrofit, and is characterized by comprising a contact member that can contact and press against a cutting target and a mounting member for mounting on the electric grinder. As a result, when cutting along the outer circumference of an object while pressing the grinder against it, the support member acts as a stabilizer, eliminating lateral movement of the grinder and allowing it to be held at a right angle. Consequently, it has the effect of preventing or reducing the occurrence of steps on the cut surface. Furthermore, since the disc-type electric grinder auxiliary device of the present invention can be retrofitted, it has the effect of being compatible with various models of grinders by being configured for attachment according to the specifications of commonly available grinders.

[0016] The disc-type electric grinder auxiliary tool of the present invention consists of a contact member and a mounting member. The contact member and the mounting member may be configured as an integral and inseparable unit, as shown in the prototype examples in Figures 8 and 9, or they may be configured as separable units. In the case of a separable configuration, for example, the mounting member may be configured as a separable attachment to the contact member, and the mounting member may be used depending on the type of grinder being used.

[0017] In this invention, the support member plays a role in maintaining contact with the object while stably keeping the disc in a vertical position during cutting. To fulfill this role, the support member is constructed as a member having a certain width (horizontal width) and outer circumference (vertical width) with an internal cavity, as illustrated in Figure 2. Hereafter, as illustrated in Figure 2, the width of the support member perpendicular to the disk plane will be referred to as the horizontal width, and the outer circumference of the support member horizontally will be referred to as the vertical width. The support member is not particularly limited as long as it fulfills the aforementioned role and configuration, and can take on various shapes and configurations.

[0018] The cutting tool member has a lumen to maintain a stable position while in contact with the object during cutting (for example, Figures 2 and 4; in the L-shape, the side that contacts the object is the side with the lumen). The support member does not need to be particularly limited in shape as long as it has a lumen and a certain width and length to maintain stability, and can take on various shapes. Typically, the support member can take on shapes such as L-shape (Figures 2 and 5), U-shape, polygon, semicircle, or semi-ellipse.

[0019] In the present invention, it is preferable to make the support member L-shaped. This makes it easier to accommodate objects of various sizes and has the effect of improving the convenience of the disc-type electric grinder auxiliary tool of the present invention. Regarding the L-shape, it can be as exemplified in Figure 2, but it is not limited to this. In other words, the angle in the L-shape does not need to be 90 degrees; it can be any angle within a certain range that can maintain the lumen.

[0020] The width of the support member must be sufficient to prevent the grinder from wobbling from side to side, and therefore the width must vary depending on the width, length, and disc radius of the grinder used. Thus, the width of the support member is not uniquely determined, but it is preferable that it be at least one times the width of the grinder used. There is no particular upper limit to the width of the support member, but it should be a width that takes into account not only stability during cutting, but also ease of handling and cost-effectiveness. As an example of a certain width that the support member may have, for example, it can be 1.0 to 5.0 times, more preferably 1.3 to 5.0 times, even more preferably 1.5 to 5.0 times, particularly preferably 2.0 to 5.0 times, and most preferably 2.0 to 4.0 times, relative to the width of the grinder. As an example of a certain width that the support member may have, it can be, for example, 8.0 to 30.0 cm, preferably 9.0 to 30.0 cm, more preferably 10.0 to 30.0 cm, and most preferably 10.0 to 28.0 cm.

[0021] The vertical width of the support member should preferably be sufficient to prevent the grinder from wobbling vertically, while also being wide enough not to get in the way when rotating it around the object. In other words, while a longer vertical length improves stability relative to the object, it may also impair handling, such as getting in the way when rotating it around the object. Therefore, a balanced vertical length is necessary. As a guideline for the vertical width of the protective component, it should be long enough to cover about half of the outer circumference of the object to be cut. As an example of the vertical width of the support member, it can be, for example, 6.0 to 20.0 cm, preferably 6.0 to 18.0 cm, more preferably 5.0 to 18.0 cm, and most preferably 6.0 to 18.0 cm.

[0022] The opening can be provided in the support member in any configuration. The opening serves to expose the disc without contacting it. For this purpose, the opening needs to have a width and length that is not too wide. The opening can typically be a rectangular shape with a width that follows the outer circumference of the support member, as shown in Figure 2. As an example of the width of the opening, it can be 1.2 to 5.0 times the thickness of the disk, more preferably 1.3 to 5.0 times, even more preferably 1.3 to 4.8 times, particularly preferably 1.3 to 4.6 times, and most preferably 1.3 to 4.5 times. As an example of the width of the opening, it can be, for example, 8.0 to 20.0 mm, more preferably 8.0 to 19.0 mm, even more preferably 8.0 to 18.0 mm, and most preferably 9.0 to 18.0 mm.

[0023] The support member may further have screw holes (support screw holes for mounting) for attachment purposes. This reinforces the fixing to the grinder by the mounting member described later, preventing and suppressing displacement of the auxiliary tool relative to the grinder, and has the effect of improving the convenience and functionality of the disc-type electric grinder of the present invention. The mounting screw holes can be provided, for example, near the center of the vertical width of the mounting member, near the opening that is close to the disc, or at the end closer to the disc if there is no opening, as shown in Figure 8h.

[0024] The support member may further have a gripping portion. This allows the user to perform work while holding the gripping portion without impairing the function of the support member, thereby improving the convenience of the disc-type grinder of the present invention. The gripping portion is not particularly limited as long as it can be gripped by the auxiliary tool, and can be configured in various ways. Typically, however, the gripping portion can be created by providing a notch on one end of the support member. For example, the roughly rectangular notch in prototype example 3 of Figure 10 corresponds to the gripping portion.

[0025] The support member may further have screw holes (extension support screw holes) for attaching extension members. This makes it possible to extend the outer circumference of the support member, which has the effect of improving the convenience of the disc-type grinder of the present invention. For example, when cutting a metal column placed on the ground, by providing an extension member, the metal column can be fixed and cut while the extension member portion is in contact with the ground, thereby improving work efficiency and stability and safety during cutting (for example, Figure 11x). The screw holes for the extension bracket can be provided, for example, by creating two screw holes near the outside of the long side of the bracket member, as shown in Figure 11w. Furthermore, the extension member is not particularly limited as long as it allows for the extension of the outer circumference of the support member, and can take on various shapes. Typically, the extension member can be a roughly rectangular member that allows for the extension of the support member, as shown in Figure 11w.

[0026] In this invention, the mounting member serves to fix the grinder and the auxiliary tool together using a fixing means. The mounting member is not particularly limited as long as it fulfills this fixing role, and various shapes or fixing means can be used. Examples of such fastening methods include screw fastening, clamp fastening, pin fastening, magnetic fastening, and snap-fit ​​fastening. In the present invention, the mounting member preferably has at least one screw hole (mounting screw hole) and is fixed to the grinder by a screw. This makes it possible to easily attach and fix the auxiliary tool to the grinder, and has the effect of improving the convenience and handling of the disc-type grinder auxiliary tool of the present invention.

[0027] Regarding the shape of the mounting member, various shapes can be adopted depending on the fixing means described above. For example, in the case of screw-type fastening, a simple flat plate with a roughly rectangular shape and screw holes in the center can be used, as shown in Figure 2. Alternatively, as shown in Figure 7, the mounting member can be configured to partially serve as a protective cover for the grinder. [Examples]

[0028] The disc-type electric grinder auxiliary tool of the present invention will be described in detail with reference to the drawings.

[0029] Figure 1 shows a disc-type electric grinder 1 equipped with a disc-type electric grinder attachment that has an opening. Figure 2 shows an example of a disc-type electric grinder attachment 2. Figure 3 is a perspective view showing the cutting of a cylindrical handrail using the disc-type electric grinder 1. Figure 4 is a cross-sectional view showing the cutting of a cylindrical handrail using the disc-type electric grinder 1.

[0030] The disc-type electric grinder 1 (hereinafter referred to as "Grinder 1") has a disc-type electric grinder auxiliary tool 2 (hereinafter referred to as "Auxiliary tool 2") attached to it by screwing it in place.

[0031] The auxiliary device 2 consists of an L-shaped support member 21 and a mounting member 23. The support member 21 is provided with an opening 22, and the disc of the grinder 1 is exposed to the inner side of the support member 21 through the opening 22, allowing it to contact and cut the object. Furthermore, compared to the auxiliary tool 2' described later, the support member has the advantage of having an opening inside, which significantly reduces lateral movement when using the grinder 1. The mounting member 23 is equipped with a screw hole 24 and a screw 25, and is attached and fixed through these to the screw hole of the grinder 1. Regarding the screw holes, since the position and configuration of the screw holes vary depending on the commercially available disc-type electric grinder, the mounting member can have various shapes or screw holes, and may even have multiple screw holes. Furthermore, the position of the mounting member relative to the backing member can also be changed depending on the grinder to which it is attached.

[0032] When cutting an object with Grinder 1, the following series of steps are performed. (1) Apply the disc perpendicular to the object and slowly press down to make a cut (Figure 4, A). When pressing down, the contact member 21 will come into contact with the object and make a cut to the extent that it will not advance any further even if pressed down. (2) While maintaining contact with the backing material 21, slowly advance the cut along the outer circumference (Figure 4, B). The backing material 21 prevents the grinder 1 from wobbling from side to side, thus preventing the formation of steps in the cross-section.

[0033] Figure 5 shows an example of a disc-type electric grinder auxiliary tool 2' (hereinafter abbreviated as "auxiliary tool 2'") that does not have an opening, and Figure 6 is a perspective view showing a cylindrical handrail being cut using a disc-type electric grinder 1 with auxiliary tool 2' attached. The auxiliary device 2' consists of an L-shaped support member 21' and a mounting member 23'. The support member 21' does not have an opening, but when attached to the grinder 1, it is configured so that the disc is exposed near either the left or right end of the support member 21'. Compared to the auxiliary tool 2 which has an opening, it has the advantage that the degree of cutting of the object can be visually confirmed (for example, Figure 11x). The mounting member 23' is equipped with a screw hole 24' and a screw 25', and is attached and fixed through these to the screw hole of the grinder 1.

[0034] Figure 7 shows another example of the disc-type electric grinder auxiliary device of the present invention. The auxiliary device shown in Figure 7 has two screw holes and is attached to the grinder by being secured to the grinder disc's protector cover with two screws.

[0035] <<Prototype Example 1>> Figure 8 shows prototype example 1 of a disc-type grinder auxiliary tool. Of Figure 8, a to d show the external appearance of prototype example 1, and e to h show how it is attached to a grinder.

[0036] Prototype 1 consists of a support member having a width of approximately 11 cm and a height of approximately 12 cm (of the L-shape, the side with the mounting member is approximately 7 cm and the other side is approximately 5 cm), and a mounting member having screw holes. The support member has an opening, and near the opening are screw holes (support screw holes). The opening is approximately 15 mm wide, with the side of the L-shape on which the mounting member is attached being approximately 50 mm, and the other side being approximately 35 mm. Furthermore, the mounting component also has screw holes, and it is secured to the grinder by screw fastening in two places.

[0037] <<Prototype Example 2>> Figure 9 shows prototype example 2 of a disc-type grinder auxiliary device. Prototype example 2 is a type that is attached by fixing it to the grinder's protective cover with screws. Figures i through l show the external appearance of prototype example 2, and figures m and n show it attached to the grinder. For convenience, the legally mandated protective cover has been removed from the figures shown.

[0038] <<Prototype Example 3>> Figure 10 shows prototype example 3 of a disc-type grinder auxiliary tool. Prototype example 3 is a type that has a gripping part. The part corresponding to the gripping portion has a roughly rectangular cutout in the support member, making it easy to hold. In addition, a cutout for fitting the thumb is provided on the opposite side of the roughly rectangular cutout, and this also functions as a gripping portion. Prototype Example 3 is designed for right-handed users, and a notch is provided on the right side of the support member, allowing the user to grip it. This configuration improves work stability, as it allows the user to partially press the support member against surfaces that are difficult to press against, such as the end of a handrail, while holding the grip.

[0039] <<Prototype Example 4>> Figure 11 shows prototype example 4 of a disc-type grinder auxiliary tool. Prototype example 4 is a type that does not have an opening and can be fitted with a member (extension member) to extend the vertical width of the support member. When the auxiliary tool is attached to the grinder, the disc is positioned on the outer right end of the support member, with the disc exposed on the inner side (s). Furthermore, in Figure 11u, the upper part is an L-shaped auxiliary device, and the lower part is an extension member. During normal use of the auxiliary device, the extension member is screwed in in a way that it does not function (state v), or the extension member is removed and the auxiliary device is used. On the other hand, the auxiliary device can be extended vertically by changing the screw holes so that the extension member can function when needed (w).

[0040] One advantage of using extension members is that they can be used when cutting an object placed on the ground. In other words, the assistive device needs to be set to a relatively short width for ease of handling in order to cut a fixed handrail. After cutting a certain area of ​​corroded material, a replacement member (metal column) is cut to a length corresponding to the cutting width. In this case, stability is increased if the replacement metal column is placed on the ground during cutting. When doing this, extending the vertical width using an extension member and cutting while pressing down with the lower vertical side of the assistive device touching the ground reduces the wobble of the grinder and makes it easier to fix the object, allowing for stable cutting. Furthermore, in such cases, since the metal column is rotated while cutting, being able to visually check the cutting progress is a significant advantage.

Claims

1. A disc-type electric grinder auxiliary device that can be retrofitted to a disc-type electric grinder, A contacting member that can be pressed against and into contact with the object to be cut, Mounting member for attachment to electric grinder, A disc-type electric grinder auxiliary tool characterized by being made of [a specific material].

2. The disc-type electric grinder auxiliary tool according to claim 1, wherein the support member is L-shaped, U-shaped, polygonal, semicircular, or semi-elliptical in shape.

3. The disc-type electric grinder auxiliary tool according to claim 1, wherein the support member has a certain width (width) in the vertical direction and a certain width (outer circumference, height) in the horizontal direction with respect to the disc plane.

4. The disc-type grinder auxiliary tool according to claim 3, wherein the width is 10.0 to 30.0 cm.

5. The disc-type grinder auxiliary tool according to claim 3, wherein the vertical width is 6.0 to 20.0 cm.

6. The disc-type electric grinder auxiliary tool according to claim 1, wherein the support member has a gripping portion.

7. The disc-type electric grinder auxiliary device according to claim 6, wherein the gripping portion is formed as a substantially rectangular cutout.

8. The disc-type electric grinder auxiliary device according to claim 1, wherein the mounting member has a mounting screw hole for attaching to a grinder, and is fixed to the disc-type electric grinder by screw.

9. The disc-type electric grinder auxiliary tool according to claim 1, wherein the support member has an extension support screw hole for extending the vertical width of the support member.

10. The disc-type electric grinder auxiliary device according to claim 1, wherein the mounting member has at least one screw hole for mounting (mounting screw hole) and is fixed to the disc-type electric grinder by screw.

11. The disc-type electric grinder auxiliary tool according to any one of claims 1 to 10, wherein the support member is provided with an opening on the inner side of the support member for exposing the disc.

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