Portable Power Tools

Abstract

A portable power tool capable of stably processing the vicinity of an end of a workpiece is provided. [Solution] The device has a motor 110, a rotating tool 120 rotated by the motor 110, and a housing 130 that protrudes the rotating tool 120 from the bottom side, and is equipped with a main body 100 that is used by pressing it downward and moving it forward, and a guide rail 10 that supports the main body 100 and guides the forward movement of the main body 100, and the guide rail 10 has a laying portion R that is laid on the workpiece W, and an extension portion E that extends in a cantilever manner from the laying portion R.

Description

[Technical field]

[0001] PORTABLE POWER TOOL FIELD OF THEINVENTION This invention relates to portable power tools, and more particularly to portable power tools for grinding or cutting weld beads. [Background technology]

[0002] Patent Document 1 describes a weld bead surface grinding device that has a traveling carriage with four wheels, an electric motor mounted on the traveling carriage, and a grinding wheel fixed to the electric motor, and cuts the bead surface while running the traveling carriage over a large aluminum plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-335850 Summary of the Invention [Problem to be solved by the invention]

[0004] The weld bead surface grinding device in Patent Document 1 is premised on cutting with all four wheels placed on the large aluminum plate, so stable cutting cannot be performed near the edge where some of the wheels protrude outside the large aluminum plate.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a portable power tool capable of stably processing the vicinity of an end of a workpiece. [Means for solving the problem]

[0006] The portable power tool of the present invention has a motor 110, a rotating tool 120 rotated by the motor 110, and a housing 130 that protrudes the rotating tool 120 from the bottom side, and is equipped with a main body 100 that is used by pressing it downward and moving it forward, and a guide rail 10 that supports the main body 100 and guides the forward movement of the main body 100, and is characterized in that the guide rail 10 has a laying portion R that is laid on the workpiece W, and an extension portion E that extends in a cantilever manner from the laying portion R.

[0007] In this portable power tool, it is preferable that the guide rail 10 has two rail members 20, and the rotating tool 120 is located between the two rail members 20 in a plan view.

[0008] It is also preferable that the guide rail 10 is provided with a clamping means 40 for attachment to the workpiece W, or is provided with a magnet 40A for attachment to the workpiece W.

[0009] In addition, it is preferable that the main body 100 has a front leg 131 and a rear leg 132 attached to the guide rail 10, the guide rail 10 has an abutment surface 421a that abuts against the rear end surface W2 of the workpiece W, and a stopper 60 that prevents the main body 100 from slipping out from the rear end of the guide rail 10, and that when the stopper 60 restricts the rearward movement of the main body 100, at least a part of the contact point (first mounting portion 131a) between the front leg 131 and the guide rail 10 is located forward of the abutment surface 421a. Effect of the Invention

[0010] The portable power tool of the present invention can support the main body in a state where it projects from the workpiece by the extension portion, and can stably perform processing near the end portion of the workpiece.

[0011] In the above-mentioned portable power tool, when the guide rail has two rail materials and the rotating tool is positioned between the two rail materials in a planar view, the force pressing the main body downward is applied approximately evenly to the two rail materials, thereby suppressing twisting of the guide rail when the main body is positioned in the extension portion.

[0012] When the guide rail is provided with a clamping means for mounting to the workpiece, or is provided with a magnet for mounting to the workpiece, the guide rail is stably mounted to the workpiece.

[0013] When the main body has front and rear legs attached to the guide rail, the guide rail has an abutment surface that abuts against the rear end surface of the workpiece and a stopper that prevents the main body from slipping out from the rear end of the guide rail, and when the rearward movement of the main body is restricted by the stopper and at least a part of the contact point of the front legs with the guide rail is located forward of the abutment surface, the downward pressing force applied to the main body during use is applied mainly to the front legs, thereby preventing the guide rail from rotating in such a way that the rear of the extension section drops and the front of the laid section rises when the main body is located in the extension section. [Brief description of the drawings]

[0014] [Figure 1] 1 is a vertical cross-sectional view showing a portable power tool according to an embodiment of the present invention attached to a workpiece. [Diagram 2] FIG. 2 is a plan view of FIG. [Diagram 3] FIG. 2 is a vertical cross-sectional view taken in a direction perpendicular to FIG. [Figure 4] FIG. 11 is a longitudinal sectional view of another portable power tool. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Next, an embodiment of the portable power tool 1 of the present invention will be described in detail with reference to the drawings. As shown in Fig. 1 and Fig. 2, the portable power tool 1 of the present invention includes a motor 110, a rotating tool 120 rotated by the motor 110, and a housing 130 from which the rotating tool 120 protrudes from the bottom side, and includes a main body 100 that is used by being pressed downward and moved forward, and a guide rail 10 that supports the main body 100 and guides the forward movement of the main body 100. Hereinafter, the components of the main body 100 will be described first.

[0016] The motor 110 is an air motor that uses compressed air as a drive source. However, it is not limited to an air motor, and may be an electric motor that uses electricity as a drive source. The rotational force generated by the motor 110 is transmitted to the rotating tool 120 via gears (not shown), for example.

[0017] The rotating tool 120 is used to process the workpiece W by cutting, grinding, polishing, etc., and is, for example, a cutter with a blade on the outer periphery of a thick disk. This cutter is mainly made of tungsten carbide. The rotation axis S120 of the rotating tool 120 is approximately perpendicular to the traveling direction of the main body 100, i.e., the extension direction of the guide rail 10, in a plan view. The rotating tool 120 rotates in a direction that throws chips forward, for example. However, it may be rotated in a direction that throws chips backward.

[0018] The housing 130 is a generally hollow rectangular parallelepiped, and houses the motor 110 in the rear and the rotating tool 120 in the front. A part of the rotating tool 120 protrudes downward from an opening in the bottom surface. Front legs 131, rear legs 132, a front handle 133, and a rear handle 134 are attached to the housing 130. The rotating tool 120 is located inside the front legs 131 and rear legs 132 in a plan view.

[0019] The front legs 131 are provided on the left and right sides of the rotating tool 120, one each. The front legs 131 include a first mounting portion 131a slidably attached to the guide rail 10, and a first leg portion 131c extending upward and rearward from the first mounting portion 131a. The first mounting portion 131a is a contact point between the front leg 131 and the guide rail 10. The center of the first mounting portion 131a in the front-rear direction is located forward of the rotation axis S120 of the rotating tool 120. It is preferable that the entire first mounting portion 131a is located forward of the rotation axis S120 of the rotating tool 120. As shown in FIG. 3, the lower part of the first mounting portion 131a has a cross-sectional shape that is roughly an inverted U-shape, and has protrusions 131b on both inner sides. By fitting these protrusions 131b into grooves 20a provided on both side sides of a rail material 20 (described later) of the guide rail 10, movement in the forward / backward direction along the rail material 20 is possible, while preventing dislodging in the upward / downward or left / right directions.

[0020] The length of the front leg 131 having the above-mentioned configuration can be adjusted by the length adjustment mechanism 150. The length adjustment mechanism 150 includes a female screw 151 and a male screw 152 screwed into the female screw 151. One of the female screw 151 or the male screw 152 (female screw 151 in FIG. 3) is rotatably fixed to the housing 130, and the other screw (male screw 152 in FIG. 3) is connected to the first leg portion 131c of the front leg 131. By turning one screw, the protruding length of the other screw from the one screw can be changed, that is, the protruding length of the front leg 131 from the housing 130 can be changed. When the protruding length of the front leg 131 is shortened, the position of the rotating tool 120 is lowered, and when the protruding length of the front leg 131 is lengthened, the position of the rotating tool 120 is raised. One screw can be rotated by turning a dial 153 protruding from the top of the housing 130.

[0021] Two rear legs 132 are provided at the rear of the housing 130. The rear legs 132 include a second mounting portion 132a slidably attached to the guide rail 10, and a second leg portion 132b extending upward from the second mounting portion 132a. The second mounting portion 132a is the contact point between the rear legs 132 and the guide rail 10. The cross-sectional shape of the second mounting portion 132a is similar to that of the first mounting portion 131a of the front leg 131. An upper portion of the second leg portion 132b is pivotally supported by an extension portion 160 extending from the rear of the housing 130, as shown in FIG.

[0022] The rotation axis S160 supported by the pivot is substantially perpendicular in plan view to the traveling direction of the main body 100. When the projection length of the front legs 131 is changed by the length adjustment mechanism 150, the main body 100 rotates about this rotation axis S160, and as a result, the rotating tool 120 moves up and down.

[0023] An engagement member 135 for restricting unintended movement of the main body 100 on the guide rail 10 is attached to the rear leg 132. By inserting the lower end of this engagement member 135 into an insertion hole 60a of a stopper 60 attached to the rear end of the guide rail 10, movement of the main body 100 on the guide rail 10 is restricted.

[0024] The front handle 133 is located forward of the housing 130. A grip portion 133a of the front handle 133 is located forward of the rotating tool 120 and the first attachment portion 131a of the front leg 131 in a plan view.

[0025] The rear handle 134 is located at the rear and upper part of the housing 130. The rear handle 134 is annular and is attached with its opening facing left and right. The grip portion 134a is located at the rear upper part of the ring and is located rearward of the center of the second mounting portion 132a of the rear leg 132 in the front-rear direction in a plan view.

[0026] Next, the guide rail 10 will be described. The guide rail 10 has a laid portion R that is laid on the workpiece W, and an extended portion E that extends in a cantilever shape from the laid portion R. This guide rail 10 includes two rail members 20, a connecting member 30 that connects the rail members 20 together, a fixing means for fixing the guide rail 10 to the workpiece W, a restricting tool 50 that restricts the main body 100 from slipping out from the front end of the guide rail 10, and a stopper 60 that restricts the main body 100 from slipping out from the rear end of the guide rail 10.

[0027] As shown in Fig. 2, the two rail materials 20 are fixed to each other by a connecting member 30 in a state where they are arranged substantially parallel to each other. When the main body 100 is attached to the rail materials 20, the rotating tool 120 is located between the two rail materials 20 in a plan view. Furthermore, the grip portion 133a of the front handle 133 is substantially perpendicular to the extension direction of the guide rail 10 in a plan view, but the center of the grip portion 133a in the left-right direction is located between the two rail materials 20 in a plan view. Furthermore, the grip portion 134a of the rear handle 134 is substantially parallel to the extension direction of the guide rail 10 in a plan view, and is located between the two rail materials 20 when the main body 100 is advanced.

[0028] The restricting device 50 is provided near the front ends of both rail members 20. The restricting device 50 protrudes above the upper surface of the rail members 20, and when the main body 100 moves forward, it comes into contact with the front ends of the first mounting portions 131a of the front legs 131, restricting further forward movement.

[0029] The stopper 60 is provided at the rear end of one of the rail members 20. This stopper 60 protrudes above the upper surface of the rail member 20, and when the main body 100 moves rearward, it abuts against the rear end of the second mounting portion 132a of the rear leg 132 to restrict further rearward movement. Since the main body 100 cannot be attached to or detached from the rail member 20 unless either the regulating tool 50 or the stopper 60 is removed, it is preferable that at least one of them is easily attached and detached. In FIG. 1, a screw is integrally provided at the lower end of the regulating tool 50 so that it can be attached and detached simply by turning the screw. The stopper 60 is fixed to the rail member 20 via a screw, and can be attached and detached simply by turning the screw.

[0030] The fixing means is a clamping means 40 that clamps the workpiece W. The clamping means 40 clamps the workpiece W from the front and rear directions, and includes a front member 41 and a rear member 42.

[0031] The front member 41 includes a first contact portion 411 that contacts the front end surface W1 of the workpiece W, and a pressing means 412 for pressing the first contact portion 411 against the front end surface W1. The workpiece W in FIG. 1 is a square steel pipe, and a weld bead W3 is continuous in the circumferential direction. In order to avoid contact with the weld bead W3, an avoidance groove 411b is provided on the pressing surface 411a of the first contact portion 411 that is pressed against the workpiece W (see FIG. 2). The pressing means 412 includes a base portion 412a fixed to the rail material 20 or the connecting material 30, a lever 412b attached to the base portion 412a, and a shaft portion 412c that is pushed out from the base portion 412a by the lever 412b. The first contact portion 411 is connected to the tip of the shaft portion 412c.

[0032] The rear member 42 is generally L-shaped in side view, and includes a second contact portion 421 that contacts the rear end surface W2 of the workpiece W, and a fixed portion 422 that extends rearward from the upper end of the second contact portion 421 and is fixed to the rail material 20 or the connecting material 30. The rear member 42 includes a reinforcing member 423 that spans the second contact portion 421 and the fixed portion 422. The front surface of the second contact portion 421 is a contact surface 421a that contacts the rear end surface W2 of the workpiece W. The portion in front of the contact surface 421a and located on the workpiece W is the laying portion R. The portion behind the contact surface 421a is an extension portion E that protrudes from the workpiece W. Note that the portion in front of the pressing surface 411a of the first contact portion 411 also protrudes from the workpiece W, so this portion can also be called the extension portion E.

[0033] Further, the distance L1 from the contact surface 421a to the front end of the stopper 60 (the surface with which the rear end of the second mounting portion 132a contacts) is shorter than the distance L2 from the front end of the first mounting portion 131a to the rear end of the second mounting portion 132a. Therefore, when the main body 100 is attached to the guide rail 10 and the rearward movement of the main body 100 is restricted by the stopper 60, at least a part of the first mounting portion 131a, which is the contact point between the front leg 131 and the guide rail 10, is located forward of the contact surface 421a. In other words, at least a part of the first mounting portion 131a is located in the laying portion R. Note that it is preferable that the entire first mounting portion 131a is located forward of the contact surface 421a.

[0034] Furthermore, distance L2 is longer than distance L3 from the lowest point P120 (the point in contact with weld bead W3) of rotating tool 120 to the rear end of second mounting portion 132a. Therefore, when main body 100 is attached to guide rail 10 and rearward movement of main body 100 is restricted by stopper 60, lowest point P120 of rotating tool 120 is located rearward of the rear end of workpiece W.

[0035] Next, a method of using the portable power tool 1 having the above-mentioned configuration will be described. First, the portable power tool 1 is attached to the workpiece W. When attaching, the workpiece W is positioned between the first abutment portion 411 and the second abutment portion 421, and the abutment surface 421a of the second abutment portion 421 is brought into contact with the rear end surface W2 of the workpiece W. In this state, the lever 412b of the pressing means 412 is tilted downward, and the shaft portion 412c pushed out by the lever 412b presses the first abutment portion 411 against the workpiece W. As a result, the workpiece W is sandwiched between the first abutment portion 411 and the second abutment portion 421, and the attachment is completed.

[0036] After the attachment is completed, the height of the rotating tool 120 is adjusted by turning the dial 153 as necessary. Then, while the rotating tool 120 is rotated by the motor 110, the main body 100 is moved forward along the guide rail 10 to cut the weld bead W3. At this time, the extension part E allows the main body 100 to be positioned behind the workpiece W, not on the workpiece W. Therefore, the rotating tool 120 can be positioned behind the rear end of the workpiece W. As a result, the weld bead W3 can be cut from the rear end of the workpiece W. In addition, since the extension part E is provided at the front, the rotating tool 120 can be positioned ahead of the front end of the workpiece W. As a result, the weld bead W3 can be cut up to the front end of the workpiece W. That is, the weld bead W3 can be cut continuously from the rear end to the front end of the workpiece W at once.

[0037] In addition, during cutting, the main body 100 is pressed downward, but since at least a part of the first mounting portion 131a is located in the laying portion R, the pressing force can be transmitted to the workpiece W via the laying portion R, and rotation of the guide rail 10 that would occur if the extended portion E were pressed down, such as the rear of the extended portion E dropping and the front of the laid portion R lifting, can be suppressed.

[0038] In addition, since the extension portion E is cantilevered, it is prone to twisting; however, since the rotating device 120 is located between the two rail materials 20 in a planar view, the force pressing the main body 100 downward is applied approximately evenly to the two rail materials 20, thereby suppressing twisting of the guide rail 10 when the main body 100 is located at the extension portion E.

[0039] To remove the portable power tool 1 from the workpiece W, the lever 412b is lifted upward to move the first contact portion 411 forward, thereby releasing the clamped state.

[0040] Next, another portable power tool 1 will be described with reference to FIG. 4. This portable power tool 1 uses a magnet 40A as a fixing means. The magnet 40A is a permanent magnet, but may be an electromagnet. The magnet 40A is preferably provided at the front or rear of the rail material 20, for example. However, it may be provided at either the front or rear. When the magnet 40A is provided at the rear, the front end surface of the magnet 40A may be an abutment surface 421a that abuts against the rear end surface W2 of the workpiece W. The magnet 40A may also be provided over the entire length of the rail material 20.

[0041] Even when the magnet 40A is used as the fixing means, the guide rail 10 can be stably attached to the workpiece W, and therefore the same effects as those of the portable power tool 1 of FIG. 1 can be achieved.

[0042] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, the first mounting portion 131a and the second mounting portion 132a slide along the rail material 20, but they may run along the rail material 20 instead of using wheels. Also, various known objects may be used as long as they are movable along the rail material 20.

[0043] Furthermore, the length adjustment mechanism 150 is not limited to adjustment by a screw, and various known length adjustment mechanisms may be used. Furthermore, since the length adjustment mechanism 150 is intended to adjust the vertical position of the rotating tool 120, it may be configured to directly change the protruding length of the rotating tool 120 from the housing 130, rather than changing the protruding length of the front legs 131. For example, by connecting the rotating tool 120 to the other screw, the vertical position of the rotating tool 120 can be directly changed.

[0044] The pressing means 412 may be one in which the shaft portion 412c is advanced and retreated by a screw, and various known pressing means may be employed. The rotating tool 120 is not limited to a cutter, and may be a grindstone, a blade, a file, a brush, or various abrasives. The workpiece W is not limited to a square steel pipe, and may be shaped steel such as H-beam or a steel plate. Also, it is not limited to steel, and may be various metals such as aluminum and stainless steel. [Explanation of symbols]

[0045] 1 Portable power tools 100 Body 110 Motor 120 Rotating Tool S120 Rotating shaft P120 lowest point 130 Case 131 Front legs 131a First mounting part 131b Protrusion 131c 1st leg 132 Hind Legs 132a Second mounting part 132b 2nd leg 133 Front Handle 133a Grip 134 Rear Handle 134a Grip 135 Engagement tool 150 Length adjustment mechanism 151 Female thread 152 Male thread 153 Dial 160 Extension S160 Rotating shaft with pivot support 10 Guide rail R laying section E extension part 20 Rail material 20a Groove 30 Connectors 40 Clamping means 40A Magnet 41 Front member 411 1st contact part 411a Pressing surface 411b Avoidance Groove 412 Pressing means 412a base 412b Lever 412c Shaft 42 Rear member 421 Second contact part 421a Contact surface 422 Fixed part 423 Reinforcement 50 Regulatory Equipment 60 Stopper 60a Insertion hole W Workpiece W1 Front end surface of workpiece W2 Rear end surface of workpiece W3 Weld Bead L1 Distance from the contact surface to the front end of the stopper L2 Distance from the front end of the first mounting part to the rear end of the second mounting part L3 Distance from the lowest point of the rotating tool to the rear end of the second mounting part

Claims

1. A main body having a motor, a rotating tool rotated by the motor, a housing from which the rotating tool protrudes from the bottom side, and a front handle, the main body being used by being pushed downward and moved forward; A guide rail that supports the main body and guides the forward movement of the main body, The guide rail has a laying portion that is laid on the workpiece and an extension portion that is extended in a cantilever manner from the laying portion, A portable power tool in which, in plan view, the grip portion of the front handle is located forward of the rotating tool.

2. The guide rail has two rail members, The portable power tool according to claim 1 , wherein the rotating tool is located between two rail members in a plan view.

3. 3. A portable power tool as claimed in claim 1 or 2, wherein the guide rail is provided with clamping means for attachment to a workpiece.

4. 3. The portable power tool of claim 1 or 2, wherein the guide rail is provided with a magnet for attachment to a workpiece.

5. A main body having a motor, a rotating tool rotated by the motor, and a housing that protrudes the rotating tool from the bottom side, and is used by pressing it downward and moving it forward; A guide rail that supports the main body and guides the forward movement of the main body, The guide rail has a laying portion that is laid on the workpiece and an extension portion that is extended in a cantilever manner from the laying portion, The main body has front and rear legs that are attached to the guide rails, the guide rail has an abutment surface that abuts against a rear end surface of the workpiece and a stopper that prevents the main body from slipping out of the rear end of the guide rail; A portable power tool in which, when the rearward movement of the main body is restricted by the stopper, at least a part of the contact point of the front leg with the guide rail is located forward of the contact surface.

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