Auxiliary tools for portable power tools, and processing apparatus using such auxiliary tools.

Abstract

This invention provides an auxiliary tool that enables stable machining using portable power tools. [Solution] An auxiliary device 20 for a portable power tool 10, which has a motor 11, a rotating tool 12 rotated by the motor 11, and legs 13 for maintaining the height position of the rotating tool 12, and is used by moving it forward while pressing it downward, and is equipped with a ramp section 21b for placing the legs 13 of the portable power tool 10 on. This ramp section 21b is installed on the workpiece.

Description

Technical Field

[0001] The present invention relates to an accessory for a portable power tool for cutting a welding bead, for example, by cutting, and a processing apparatus using the accessory.

Background Art

[0002] Patent Document 1 describes a welding bead surface grinding apparatus having a traveling carriage equipped with four wheels, an electric motor mounted on the traveling carriage, and a grinding wheel fixed to the electric motor, and cutting the bead surface while moving the traveling carriage on a large aluminum plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when trying to cut a welding bead, especially at the beginning of cutting, a rotating tool such as a grinding wheel may get caught on the welding bead, and a so-called kickback may occur, in which the entire apparatus is repelled in a direction opposite to the rotation direction of the rotating tool.

[0005] An object of the present invention is to provide an accessory that can stably perform processing with a portable power tool.

Means for Solving the Problems

[0006] The accessory of the present invention has a motor 11, a rotating tool 12 rotated by the motor 11, and a leg portion 13 for maintaining the height position of the rotating tool 12, and is an accessory for a portable power tool 10 that is used by moving forward while pressing downward, and is characterized by including a slope portion 21b for placing the leg portion 13 of the portable power tool 10.

[0007] In the above-described auxiliary device, it is preferable to have an extended portion 21c that cantilever outwards from the workpiece W.

[0008] Furthermore, it is preferable to have a stopper portion 21e that contacts the end portion W2 of the workpiece W and maintains a constant distance from the end portion W2 of the workpiece W to the slope portion 21b.

[0009] The processing apparatus of the present invention is characterized by comprising an auxiliary tool 20 as described above, a motor 11, a rotating tool 12 rotated by the motor 11, and legs 13 for maintaining the height position of the rotating tool 12, and a portable power tool 10 used by moving it forward while pressing it downward.

[0010] In the above-described processing apparatus, it is preferable that the portable power tool 10 has two legs 13 positioned in the left-right direction, a rotating tool 12 is located between the two legs 13, and the auxiliary tool 20 has an opening 21f for bringing the rotating tool 12 into contact with the workpiece W.

[0011] Furthermore, it is preferable that the leg portion 13 comprises a front leg 13a and a rear leg 13b, and that the length of the slope portion 21b is longer than the distance between the front leg 13a and the rear leg 13b. [Effects of the Invention]

[0012] The auxiliary tool and processing apparatus of the present invention are equipped with a ramp for placing the legs of a portable power tool. By moving the portable power tool down the ramp, the entry angle of the rotating tool can be made shallower compared to simply pushing the portable power tool down from above, thereby suppressing the occurrence of kickback.

[0013] In the above-mentioned auxiliary device, if an extended portion is provided that cantilevered outward from the workpiece, the portable power tool can be supported by the extended portion in a position that protrudes from the workpiece, thereby enabling stable machining near the end of the workpiece.

[0014] When a stopper portion that abuts against an end portion of a workpiece and keeps the distance from the end portion of the workpiece to the slope portion constant is provided, it is possible to always process only a certain range from the end portion of the workpiece.

[0015] In a processing apparatus, when a portable power tool has two legs in the left - right direction and a rotating tool is located between the two legs, and an auxiliary tool has an opening for bringing the rotating tool into contact with a workpiece, the portable power tool can be placed on the auxiliary tool in a stable state by the two legs, and processing can be performed through the opening while maintaining that state.

[0016] When the legs include a front leg and a rear leg, and the length of the slope portion is longer than the interval between the front leg and the rear leg, it is possible to perform processing with the front leg and the rear leg placed on the slope portion, and the entry angle of the rotating tool is stabilized.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1A is a plan view of a portable power tool, and FIG. 1B is a longitudinal sectional view of the portable power tool. [Figure 2] FIG. 2A is a plan view of an auxiliary tool, and FIG. 2B is a side view. [Figure 3] It is a plan view showing a state where an auxiliary tool is attached to a workpiece. [Figure 4] It is a longitudinal sectional view showing a process of moving a portable power tool so as to go down a slope portion. [Figure 5] It is a plan view of an auxiliary tool provided with a guide. [Figure 6] It is a sectional view showing a state where an auxiliary tool with an extended portion omitted is attached to a workpiece. [Figure 7] FIG. 7A is a plan view of an auxiliary tool with a laying portion omitted, and FIG. 7B is a side view. [Figure 8] It is a longitudinal sectional view showing a process of moving a portable power tool so as to go up a slope portion.

Embodiments for Carrying Out the Invention

[0018] Next, an embodiment of the processing apparatus 1 of the present invention will be described in detail based on the drawings. The processing apparatus 1 of the present invention is for cutting, for example, a welding bead W1 of a workpiece W, and as shown in FIGS. 1 to 4, includes a portable power tool 10 and an accessory 20 for this portable power tool 10.

[0019] First, the portable power tool 10 will be described. The portable power tool 10 is used by moving it forward while pressing it downward, and as shown in FIGS. 1A and 1B, includes a motor 11, a rotating tool 12 rotated by the motor 11, a leg portion 13 for maintaining the height position of the rotating tool 12, and a housing 14 for housing the motor 11.

[0020] The motor 11 is an air motor having compressed air as a driving source. However, it may be an electric motor having electricity as a driving source, not limited to an air motor. The rotational force generated by the motor 11 is transmitted to the rotating tool 12 via, for example, gears (not shown).

[0021] The rotating tool 12 is for processing the workpiece W by cutting, grinding, polishing, etc., and is, for example, a cutter provided with blades on the outer periphery of a thick disk. This cutter has tungsten carbide as a main component. The rotation axis of the rotating tool 12 is substantially orthogonal to the traveling direction of the portable power tool 10 in a plan view. The rotation direction of the rotating tool 12 is, for example, a direction for flying chips forward. However, it may be rotated in a direction for flying chips backward.

[0022] The leg portion 13 is divided into a front leg 13a and a rear leg 13b. The front leg 13a is a wheel, and one is provided on each of the left and right sides of the rotating tool 12. In this state, it can also be said that the rotating tool 12 is located between the two front legs 13a arranged in the left - right direction. The interval between the two front legs 13a is wider than the left - right width of an opening 21f (described later) of the accessory 20. Therefore, the two front legs 13a can always be placed on a placement portion 21 (described later) of the accessory 20. The rotation axis of the wheel is substantially parallel to the rotation axis of the rotating tool 12. In other words, it is substantially orthogonal to the traveling direction of the portable power tool 10 in a plan view.

[0023] The front leg 13a in the above configuration can have its protrusion length from the housing 14 adjusted by a length adjustment mechanism (not shown). The length adjustment mechanism includes, for example, a female screw and a male screw screwed into the female screw, and by turning one screw, the protrusion length of the other screw from the other screw can be changed. In other words, the protrusion length of the front leg 13a from the housing 14 can be changed. When the protrusion length of the front leg 13a is shortened, the height position of the rotating tool 12 is lowered, and when the protrusion length of the front leg 13a is lengthened, the height position of the rotating tool 12 is raised. One of the screws can be turned by turning a dial 17 that protrudes from the top of the housing 14.

[0024] A single rear leg 13b is provided at the rear of the housing 14. This rear leg 13b consists of two wheels. The distance between the two wheels in the lateral direction is wider than the width of the opening 21f in the lateral direction. Therefore, the two front legs 13a can always be placed on the mounting section 21. The axis of rotation of the wheels is substantially parallel to the axis of rotation of the rotating mechanism 12.

[0025] The housing 14 is a roughly hollow rectangular parallelepiped, housing the motor 11 at the rear and the rotating mechanism 12 at the front. A portion of the rotating mechanism 12 protrudes downward from an opening in the bottom of the housing 14. A front handle 15 and a rear handle 16 are attached to this housing 14.

[0026] The front handle 15 is positioned in front of the housing 14. In a plan view, the grip portion 15a of the front handle 15 is positioned in front of the rotating tool 12 and the front legs 13a. In a plan view, this grip portion 15a is approximately perpendicular to the direction of travel of the portable power tool 10.

[0027] The rear handle 16 is located at the rear and above the housing 14. The rear handle 16 is annular in shape and is mounted so that its opening faces left and right. The grip portion 16a is located at the rear upper part of the ring and, in a plan view, is located at the same position as or further back than the rear leg 13b.

[0028] Next, the auxiliary device 20 will be described. As shown in Figures 2A and 2B, the auxiliary device 20 includes a mounting section 21 for placing the legs 13 of the portable power tool 10 on, and a fixing means 22 for fixing the mounting section 21 to the workpiece W.

[0029] The mounting section 21 includes a laying section 21a laid on the workpiece W, a slope section 21b provided so as to be an uphill slope from the end of the laying section 21a, an extension section 21c (see Figure 3) extending from the end of the laying section 21a opposite to the slope section 21b and cantilevering out from the workpiece W, and a flat section 21d extending from the end of the slope section 21b.

[0030] The length of the slope section 21b in the front-rear direction is preferably longer than the distance between the front legs 13a and rear legs 13b of the portable power tool 10 in the front-rear direction. In this case, the front legs 13a and rear legs 13b can be placed on the slope section 21b simultaneously, and the entry angle of the rotating tool 12 to the workpiece W is stabilized when the slope section 21b is used as a downhill slope. The gradient of the slope section 21b is preferably, for example, 10 to 40 degrees.

[0031] This mounting portion 21 is formed, for example, by bending a metal plate, and its upper and lower surfaces are flat. When the laying portion 21a is laid on the upper surface of the workpiece W, the upper surface of the laying portion 21a and the upper surface of the workpiece W become substantially parallel.

[0032] The mounting section 21 is fitted with a stopper section 21e that contacts the end W2 of the workpiece W to maintain a constant distance from the end W2 of the workpiece W to the slope section 21b. This stopper section 21e is attached to the boundary between the laying section 21a and the extension section 21c. It can also be said that the stopper section 21e separates the laying section 21a and the extension section 21c.

[0033] Furthermore, the mounting section 21 is provided with an opening 21f to allow the rotating tool 12 to contact the workpiece W while avoiding contact between the rotating tool 12 and the auxiliary tool 20 when the legs 13 of the portable power tool 10 are placed on it. The opening 21f is provided from the laying section 21a to the slope section 21b. In Figure 2A, it is provided from the extended section 21c to the slope section 21b, and the mounting section 21 is bifurcated. Therefore, although it is described as an "opening," it could also be described as a notch.

[0034] Reference numeral 21g denotes a connecting member that connects the ends of the bifurcated extension portion 21c formed by the opening 21f. Note that the stopper portion 21e and the connecting member 21g may be constructed from a single component.

[0035] The fixing means 22 is fixed to the lower surface of the flat portion 21d, as shown in Figure 2B. For example, it is a magnet that can be attached and detached by lever operation. A permanent magnet is assumed, but an electromagnet may also be used. In addition to a magnet, various other fixing means can be used, such as a suction cup or a clamp that can fix the workpiece by gripping it. The fixing means 22 is equipped with a avoidance portion 22a in the center in the left-right direction so that it does not come into contact with the weld bead W1 when attached to the workpiece W (see Figure 2A).

[0036] Next, a method for grinding the weld bead W1 using the processing device 1 will be described. First, the auxiliary tool 20 is attached to the workpiece W so that the weld bead W1 is exposed from the opening 21f, in other words, so that the weld bead W1 is positioned between the bifurcated laying sections 21a (see Figure 3). At this time, the tool is attached so that the longitudinal direction of the opening 21f is approximately parallel to the weld bead W1. Also, the side surface 21e1 of the stopper section 21e is brought into contact with the end W2 of the workpiece W.

[0037] Next, as shown in Figure 4, the portable power tool 10 is placed on the slope section 21b or the flat section 21d. At this time, the rotating tool 12 is positioned in the opening 21f, but care is taken to ensure that the rotating tool 12 does not touch the welding bead W1. Then, gripping the front handle 15 and the rear handle 16 respectively, the motor 11 is used to rotate the rotating tool 12, while the portable power tool 10 is pushed downwards and moved down the slope section 21b towards the laying section 21a.

[0038] As the portable power tool 10 is moved forward (towards the laying section 21a), it can be gradually lowered to match the gradient of the slope section 21b. This suppresses the occurrence of kickback caused by the blade of the rotating tool 12 penetrating deeply into the weld bead W1. By advancing the rotating tool 12 to the extension section 21c, the weld bead W1 can be cut to its end. Furthermore, because the stopper section 21e maintains a constant distance from the end W2 of the workpiece W to the slope section 21b, the weld bead W1 can be cut to a predetermined length.

[0039] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be implemented with various modifications within the scope of the present invention. For example, as shown in Figure 5, a guide 21h may be provided on the upper surface of the mounting portion 21 to prevent the legs 13 from falling off the mounting portion 21 and to prevent the rotating tool 12 from coming into contact with the mounting portion 21. The guide 21h can be made up of, for example, grooves or protrusions along the direction of travel of the portable power tool 10.

[0040] Furthermore, as shown in Figure 6, the extension portion 21c and the stopper portion 21e are not necessarily required. Also, the position where the fixing means 22 is provided is not limited to the lower surface of the flat portion 21d, but may be, for example, the lower surface of the laying portion 21a or the slope portion 21b. In addition, the flat portion 21d may be omitted.

[0041] Furthermore, as shown in Figures 7A and 7B, the laying section 21a may be omitted. In this case, the lower end of the slope section 21b is installed so as to abut the workpiece W. In the portable power tool 10 shown in Figure 1, the lower end of the rotating tool 12 was positioned lower than the front leg 13a by, for example, the thickness of the laying section 21a, so that the rotating tool 12 would contact the weld bead W1 of the workpiece W with the leg section 13 resting on the laying section 21a. However, if the laying section 21a is omitted, it is preferable to raise the rotating tool 12 by, for example, the thickness of the laying section 21a. For example, it is preferable to align the height of the lower end of the rotating tool 12 with the height of the lower end of the front leg 13a.

[0042] Furthermore, as shown in Figure 8, the slope section 21b may be used as an uphill slope instead of a downhill slope. Specifically, the portable power tool 10 may be placed on the extension section 21c and moved toward the slope section 21b while pressing the portable power tool 10 downwards, thereby cutting the weld bead W1 from the end W2 of the workpiece W.

[0043] Once a certain amount of cutting has been done and the front leg 13a reaches the slope section 21b, the front of the portable power tool 10 lifts up, and the rotating tool 12 gradually moves upward away from the weld bead W1. As a result, the end of the weld bead W1 is cut at a roughly oblique angle.

[0044] Furthermore, it is preferable that the length of the extension 21c in the front-to-back direction is longer than the distance between the rotating tool 12 and the rear leg 13b in the front-to-back direction. In this case, the front leg 13a and the rear leg 13b can be placed simultaneously on the extension 21c without the rotating tool 12 coming into contact with the weld bead W1, and cutting can be started in a stable state with both the front leg 13a and the rear leg 13b in contact with the ground.

[0045] Furthermore, the legs 13 do not necessarily have to be wheels; they may be, for example, sled-shaped legs that make surface contact with the mounting section 21. In this case, it is possible to omit either the front legs 13a or the rear legs 13b.

[0046] The rotating tool 12 is not limited to a cutter; it may also be a grinding wheel, blade, file, brush, or various abrasive materials. The workpiece W may be a shaped steel such as a square steel pipe or an H-beam. Furthermore, the material is not limited to steel; it may be various metals such as aluminum or stainless steel. [Explanation of Symbols]

[0047] 1 Processing equipment 10 Portable Power Tools 11 Motors 12 Rotating Tools 13 Legs 13a front leg 13b Hind legs 14 cabinets 15 Front handle 15a Grip 16 Rear handle 16a Grip 17 Dials 20 assistive devices 21 Mounting section 21a Laying section 21b Slope section 21c extension part 21d flat area 21e Stopper part 21e1 Side view of the stopper section 21f opening 21g binder 21h Guide 22 Fixing means 22a Avoidance part W Workpiece W1 Weld Bead W2 End of workpiece

Claims

1. An auxiliary device for a portable power tool, comprising a motor, a rotating tool rotated by the motor, and legs for maintaining the height of the rotating tool, which is used by moving it forward while pressing it downwards, An auxiliary device equipped with a ramp for supporting the legs of portable power tools.

2. The auxiliary tool according to claim 1, comprising an extended portion that cantilevered outward from the workpiece.

3. The auxiliary tool according to claim 1, further comprising a stopper portion that contacts the end of the workpiece to maintain a constant distance from the end of the workpiece to the slope portion.

4. An auxiliary device according to any one of claims 1 to 3, A processing apparatus comprising a motor, a rotating tool rotated by the motor, and legs for maintaining the height of the rotating tool, and a portable power tool used by moving it forward while pressing it downward.

5. The portable power tool has two legs positioned to the left and right, A rotating mechanism is located between the two legs. The machining apparatus according to claim 4, wherein the auxiliary tool has an opening for bringing the rotating tool into contact with the workpiece.

6. The legs consist of front legs and hind legs. The processing apparatus according to claim 4, wherein the length of the slope section is longer than the distance between the front and rear legs.

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