JPH0632009U - Attachment for power tools - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an attachment for an electric tool for simultaneously punching lines forming both sides of a groove having a predetermined groove width. [Structure] A first disc cutter portion 2 attached to a rotary shaft 21 and having a radius R from a central axis X of the rotary shaft, a second disc cutter portion 3 attached in the same manner as the first disc cutter portion 2, and both. A cutter support portion 4 is provided to set the distance between the outer surfaces of the disc cutter portions 2 and 3 to be the groove width B.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an attachment for a power tool, which is attached to a power tool body having a rotary drive shaft and the like and simultaneously cuts lines forming both sides of a groove having a predetermined groove width.

[0002]

[Prior art]

 In the past, in construction work, it was sometimes necessary to cut a groove on a concrete wall or the like for routing wiring such as electricity.

[0003]

[Problems to be solved by the device]

 However, in the above case, there is no normal rotating disc cutter or the like that guides for cutting lines on both sides of the groove with a predetermined width on the wall surface. It could not be excavated accurately. For this reason, conventionally, the lines to be the both sides of the groove were cut twice on the concrete wall with a rotating disk cutter, etc., but the groove width was not accurate, and the groove width was not accurate and it was not accurate. However, it was not satisfactory, and its improvement was desired. The present invention has been made to solve the above problems, and an object of the present invention is to provide an attachment for a power tool for simultaneously cutting lines forming both side surfaces of a groove having a predetermined groove width.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the attachment for a power tool according to the present invention is attached to a rotary drive shaft that is rotationally driven by a drive source, and simultaneously cuts lines forming both side surfaces of a groove having a predetermined groove width. An attachment for a power tool, which is mounted on the rotary drive shaft, has a drive center axis that is the center axis of the rotary drive shaft as a rotation center axis, and has a radius from the drive center axis that is a predetermined radius. A disk shape that is attached to the first blade part of the rotary drive shaft and the drive center shaft, which is the center shaft of the rotary drive shaft, is the rotation center shaft, and the radius from the drive center shaft is the predetermined radius. A second blade portion, and groove width setting means for setting the distance in the drive center axis direction from the outer surface of the first blade portion to the outer surface of the second blade portion to be the predetermined groove width. Prepared for.

[0005]

[Action]

 According to the attachment for an electric power tool of the present invention having the above configuration, the groove width setting means is such that the distance between the outer surface of the first blade portion and the outer surface of the second blade portion in the drive center axis direction is the predetermined groove. Since the width is set so that the worker can easily simultaneously cut the cutting lines that should form both side surfaces of the groove having a predetermined width, by merely bringing the electric tool into contact with the concrete wall surface or the like.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The construction of an attachment for an electric power tool, which is an embodiment of the present invention, is shown in FIGS. As shown in FIG. 1, this attachment 1 for a power tool is an attachment for simultaneously cutting the cutting lines L1 and L2 that should form both side surfaces of a groove of a predetermined width B on a concrete wall surface W, and is shown in FIG. A grinder having a built-in rotary drive source such as a motor. A cutter support portion 4 as groove width setting means that is attached by screwing to a rotary shaft 21 that is a rotary drive shaft of a main body portion 20 and attached to this cutter support portion 4. A first disc cutter portion 2 that is a first blade portion and a second disc cutter portion 3 that is a second blade portion are provided.

A more detailed structure of the attachment 1 for an electric power tool will be described with reference to FIGS. 2 and 3. As shown in FIG. 3, the first disc cutter portion 2 and the second disc cutter portion 3 are provided with disc connecting holes 7 and 8, and screw holes 13 and 14, respectively.

The cutter support portion 4 is composed of two disk portions and a cylindrical portion located in the middle thereof, and both ends thereof project as fitting convex portions 15, and the fitting convex portions 15 are formed as described above. It is configured to fit with the disk connection holes 7 and 8. Further, each of the disk portions of the cutter support portion 4 is also provided with four screw holes 17.

Therefore, the fitting protrusion 15 and the disk connection holes 7 and 8 are fitted to each other, and the screw holes 13 and 17 and the screw holes 14 and 17 are aligned with each other so that the screw 18 is inserted and tightened. For example, the first disc cutter portion 2 and the second disc cutter portion 3 can be fixed to the disc support portion 4.

Since a female screw portion 16 is provided at the center of the cutter support portion 4, the female screw portion 16 and the male screw portion 22 provided on the outer peripheral surface of the rotary shaft 21 are screwed to rotate. If it is fixed to the shaft 21, the rotational driving force of the rotary shaft 21 is transmitted.

In this case, as shown in FIG. 2, the radii from the drive center axis X, which is the central axis of the rotary shaft 21, to the outermost edges of the first disc cutter portion 2 and the second disc cutter portion 3 are R, respectively. Has become. In this case, since the disk portion of the cutter support portion 4 is attached to the portion from the drive central axis X to the radius r, the maximum depth of the cutting line that can be cut by this attachment 1 is shown in the figure. It becomes D as it is done.

Further, the thickness of each of the two disc cutters 2 and 3 is t 1 as shown in the figure, and from the outer surface of the first disc cutter portion 2 to the outer surface of the second disc cutter portion 3. The distance (H + 2 × t) in the drive center axis direction is set to be the groove width B.

The first disc cutter portion 2 and the second disc cutter portion 3, which are blade portions, are disc-shaped cutters having the drive center axis X as the center axis, and diamond fine powder is provided on the outer edge portion of the disc. The diamond cutters 11A and 12A are provided in a plurality of parts in which a large number of are embedded, and in the middle of each diamond cutter 11A and 12A, a plurality of radial cutter grooves 11B and 12B centering on the drive center axis are provided. There is.

The groove of the disc cutter is usually formed in a spiral shape, but the reason for making it radial as described above is that the disc cutter can be attached from either side without distinguishing between the front and back. Because it was done.

Next, the operation of the power tool including the grinder main body 20 to which the attachment 1 for a power tool is attached will be described with reference to FIG.

First, in the concrete wall W, the first disc cutter portion 2 and the second disc are formed at arbitrary portions of the cutting lines L 1 and L 2 to be cut into grooves at predetermined positions from the surface of the concrete wall W. The blades 11A and 12A of the cutter unit 3 are rotated while being applied to form a cutting groove for starting the cutter.

After that, while keeping the above state, the rotary shaft 21 is moved in parallel to the front side or the back side in FIG. 1, and two cutting lines L1 and L2 with an outer surface spacing of B are punched. Can be cut. This excavation work can be performed not only in a linear form but also in a curved form.

When the cutting lines L1 and L2 have been cut to the desired position, the inside of these two cutting lines L1 and L2 is hung with a chisel or the like to form a groove portion having a predetermined width B. .

The present invention is not limited to the above embodiment. The above-mentioned embodiment is an exemplification, and has any constitution that is substantially the same as the technical idea described in the scope of claims for utility model registration of the present invention and has the same operational effect. However, it is included in the technical scope of this proposal.

For example, in the above embodiment, as the groove width setting means, the distance (H + 2 × t) in the drive center axis X direction from the outer surface of the first disc cutter portion 2 to the outer surface of the second disc cutter portion 3 is used. Has described an example of using the cutter support portion 4 fixedly set to the groove width B. This is the first using a "combined screw mechanism" or a plurality of types of spacers (gap adjustment members). The distance (H + 2 × t) in the drive center axis X direction from the outer surface of the disc cutter portion 2 to the outer surface of the second disc cutter portion 3 may be variably set.

Further, in the above embodiment, the depth of the two cutting lines to be excavated was freely decided by the worker within the range of the maximum depth D or less, but in the case where the groove depths are all predetermined depths, etc. , The width of the two disk portions of the cutter support portion 4 may be further widened so as to serve as a kind of guide for the depth, or the upper portion of the first disc cutter portion 2 or the second disc cutter portion may be formed. It is also possible to provide a cylindrical convex groove depth guide in the lower part of 3 and the like, and set the above-mentioned D as the predetermined groove depth and drill the disc cutter until the depth becomes D. According to this structure, not only the groove width but also the groove depth can be accurately set.

Further, in the above-mentioned embodiment, the concrete wall has been taken as an example of the object of excavation, but it is of course applicable to stone wall, wood wall, plastic wall surface and the like.

[0023]

[Effect of device]

 As described above, according to the attachment for an electric power tool of the present invention having the above configuration, the groove width setting means includes the outer surface of the first blade portion and the outer surface of the second blade portion in the drive center axis direction. Since the distance is set to the above-mentioned predetermined groove width, the worker can easily make the cutting line to be formed on both side surfaces of the groove of a predetermined width by only abutting this electric tool on the concrete wall surface. Can be drilled at the same time.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration when an attachment for a power tool according to an embodiment of the present invention is used.

FIG. 2 is a side view showing a more detailed configuration of the electric tool attachment shown in FIG.

FIG. 3 is an exploded perspective view showing a more detailed configuration of the electric tool attachment shown in FIG. 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric tool attachment 2 1st disc cutter part 3 2nd disc cutter part 4 Cutter support part 7,8 Disc connection hole 11A, 12A Diamond cutter 11B, 12B Cutter groove 13,14 Screw hole 15 Fitting convex part 16 Female screw Part 17 Screw hole 18 Screw 20 Grinder body part 21 Rotating shaft 22 Male screw part B Groove width D Maximum groove depth H Support part length L1 First cutting line L2 Second cutting line R Disk radius r Support part radius t Cutter thickness W Concrete wall X drive center

Claims (1)

[Scope of utility model registration request] 1. An attachment for a power tool, which is attached to a rotary drive shaft which is rotationally driven by a drive source, for simultaneously cutting lines forming both side surfaces of a groove having a predetermined groove width, the rotary drive shaft being attached to the rotary drive shaft. A disk-shaped first blade part that is attached and has a drive center axis that is the center axis of the rotation drive shaft as a rotation center axis, and a radius from the drive center axis is a predetermined radius; and is attached to the rotation drive shaft. A disk-shaped second blade portion having a drive center axis that is the center axis of the rotary drive shaft as a rotation center axis and a radius from the drive center axis being the predetermined radius; and an outer surface of the first blade portion. And a groove width setting means for setting a distance in the drive center axis direction from the outer surface of the second blade portion to the predetermined groove width, the attachment for a power tool.