JPS6128683Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc grinder.

In general, this type of disc grinder is mainly used for flat grinding of metal materials, but when cutting work materials such as tiles or stones, it is used for normal grinding work. A diamond grindstone, etc. was attached in place of the grindstone used, and the worker held the grinder body upright against the workpiece.
The working conditions became extremely unstable and involved a great deal of danger, making it impossible to perform the cutting work satisfactorily.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, the present invention aims to provide a disc grinder equipped with a cutting attachment that allows the disc grinder to perform cutting operations in a stable, extremely safe and smooth manner.

Hereinafter, the illustrated embodiment embodying the present invention will be described in detail. In the figure, reference numeral 1 indicates the main body of the disc grinder, and a motor case 2 has a built-in motor (not shown) and also serves as a gripping portion of the main body 1.
and a gear case 3 which is attached to the motor case 2 by screws 22 and has a reduction gear described below built therein, and a motor shaft 4 of the motor is rotatably supported by a bearing 5 with respect to the gear case 3. A bevel gear 6 is fixed facing inside the case 3, and a reduction bevel gear 7 meshed with the bevel gear 6 is fixed to a grindstone shaft 8 rotatably supported by the gear case 3. One end of the grindstone shaft 8 protrudes from the gear case 3 to form a threaded part, and the grinding wheel g
and a diamond grindstone g' for cutting are exchangeably attached to the grindstone shaft 8. Of the upper and lower clamping members 9, 10, the clamping member 9 on the upper side in the figure, that is, on the side of the gear case 3, has a vibration isolating member 9a made of rubber or the like on one surface, as shown in FIGS. 1 and 5A and 5B. The vibration isolating member 9a is attached to the end face of the grindstone g when the grinding wheel g is attached (see FIG. 5B), and when the diamond grindstone g' for cutting is attached When replacing the grinding wheels, they are reversed so that the other metal surface is in contact with the end face of the diamond grinding wheel g' (see Figure 5 A). This is to prevent transmission to the side, motor, etc. Further, as shown in FIG. 1, a fixing plate 11 is interposed at the joint portion between the motor case 2 and the gear case 3, and this plate 11 is attached to the outer ring 5 of the bearing 5 that supports the motor shaft 4 in the gear case 3.
The structure is such that the bearing 5 is prevented from coming off by being brought into contact with the bearing 5. In addition, the inner ring 5b of the bearing 5
is positioned at the stepped portion of the motor shaft 4.

The semicircular grindstone cover 12 is attached to the gear case 3.
The wheel cover 12 is rotatably fitted onto the boss portion 3a of the grinding wheel g or diamond grinding wheel g' and elastically fastened by a screw 13, and its arc-shaped outer periphery is bent into an approximately U-shape in cross section so as to cover one end face (the upper surface in FIG. 1) of the grinding wheel g or diamond grinding wheel g' and approximately half of the outer periphery. A square hole 14 is formed in part of this grinding wheel cover 12 for mounting and fixing a cutting attachment, which will be described later.

As shown in FIG. 4, the cutting attachment 15 includes a flat contact plate 16 that comes into contact with the workpiece W;
A board 1 bent integrally from one end of this plate
7 and is formed into a substantially L-shape in plan view, both ends of the contact plate 16 are curved upward, and a long mounting hole 18 is provided in the base plate 17 in the longitudinal direction thereof. The cutting attachment 15 is shown in FIGS. 2 and 3.
As shown in the figure, a part of the substrate 17 and the contact plate 16
The substrate 17 is placed on the upper surface of the grindstone cover 12, and the long mounting hole 18 of the substrate 17 is placed so that it extends parallel to the end surface of the grindstone g or diamond grindstone g' exposed from the grindstone cover 12. A headed set screw 19 having a square shaft portion 19a that matches and fits into the square hole 14 of the grindstone cover 12.
It is removably fastened to the grindstone cover 12 with a wing nut 20 and a wing nut 20. Therefore, the cutting attachment 15 can adjust the distance between the lower surface of the contact plate 16 and the outer periphery of the grinding wheel g or the diamond grinding wheel g', that is, the length of the cutting depth h, by using its tightening means and the structure of the long mounting hole 18. is possible. In addition, the cutting attachment 15 is configured to prevent wobbling during use by tightening a wing nut 20 and a head set screw 19 having a square shaft portion 19a, which is a means for preventing rotation of the shaft itself. In order to do this, as shown in FIGS. 2 and 3, the engagement piece 21 cut and raised from the linear end face of the whetstone cover 12 is fitted into the long mounting hole 18 of the base plate 17, so that the base plate 17 is attached to the whetstone cover. 1
2, it is supported at two points.

This embodiment is constructed as described above, and when used for normal grinding work, the grinding wheel g is fixed to the grinding wheel shaft 8 by the upper and lower clamping members 9 and 10 as shown in FIG. 1 is in a normal state, that is, the end face of the grindstone g is directed toward the workpiece W side, and a desired grinding operation is performed. When cutting a workpiece W such as a tile or stone using a disc grinder, as shown in FIG. and the lower clamping member 10, a diamond grindstone g' is fixed to the grindstone shaft 8 instead of the above-mentioned grindstone g, and a cutting attachment 15 is fixed to the grindstone cover 12 as shown. That is, substrate 1
7 is placed on the upper surface of the whetstone cover 12, and the locking piece 21 is fitted into the long mounting hole 18 thereof, and the long mounting hole 18 is aligned with the square hole 14, and the set screw 19 with head and the wing nut 20 are tightened. It is fixed to the grindstone cover 12. At this time of fixing, the lower surface of the contact plate 16 and the diamond grinding wheel are cut according to the thickness of the workpiece W to be cut.
This is to set the distance from the outer periphery of the grindstone cover 12, that is, the cutting depth h, and loosen the screw 13 for attaching the cover 12 so that one end surface of the grindstone cover 12 does not come into contact with the workpiece W. The position is set by rotating it. The distance between the lower surface of the contact plate 16 of the cutting attachment 15 and the outer periphery of the diamond grindstone g' is also determined by the rotating state of the grindstone cover 12. Then, the main body 1 is erected so that the diamond grindstone g' is perpendicular to the workpiece W, and in this state, the lower surface of the contact plate 16 of the cutting attachment 15 is placed on the workpiece W.
The cutting operation is carried out by holding the main body in contact with the upper surface and supporting it by the operator, and using this contact plate 16 as a guide, the main body is sequentially moved in the two arrow directions shown in the figure. (See Figures 2 and 3) In this embodiment, as shown in Figure 1, the main body 1
A fixing plate 11 is interposed between the motor case 2 and the gear case 3 and is fixed with screws 22 when the two are connected to support the motor shaft 4 which receives the force in the thrust direction from the bevel gear 6. Since the outer ring 5a of the bearing 5 is supported to prevent it from falling out, conventionally, for example, a box-shaped support member has been assembled around the bearing as a member for fixing the bearing so that it does not fall out, or The bearing 5 is different from the one in which the support of the ring is configured in the front-rear direction opposite to that shown in the figure, and the bevel gear retaining circlip, which also serves as a retainer for the outer ring, is assembled from inside the gear case. It has the advantage of making the support structure extremely simple and compact, as well as making the assembly work extremely easy, and as shown in Figure 5 A and B, the grinding wheel g and tile stone used for normal grinding work can be easily assembled. When attaching and fixing a diamond grindstone g' used for cutting operations such as the like to the grindstone shaft 8 according to each task, in particular, when attaching and fixing the usual grindstone g, the upper clamping member 9 having the vibration isolating member 9a and the Since it is clamped to the lower clamping member 10, it has the advantage that the vibration isolating member 9a can provide vibration isolation during work.

In addition to the description of this embodiment, the following technical means are expected. (A), Cutting attachment 15
Alternatively, the grinding wheel cover 12 may be provided with a scale so that the cutting depth h can be read, and (b) the contact plate 16 of the cutting attachment 15 may be provided with a roller slightly protruding from its lower surface to allow contact with the workpiece. (c) The attachment state of the cutting attachment 15 to the whetstone cover 12 is set at an angle other than that shown, that is, the angle with respect to the straight edge of the whetstone cover 12 is arbitrarily set. For example, the configuration should be such that it is possible to do so.

As described above, the present invention provides a disc grinder equipped with a disk-shaped grinding wheel supported on a grinding wheel shaft in a gear case of a grinding body so as to be capable of positive rotation, and a grinding wheel cover which covers approximately half of the grinding wheel and is rotatably attached to the gear case, a base plate which extends parallel to the side surface of the grinding wheel exposed from the grinding wheel cover and is attached to the grinding wheel cover so that the length of protrusion from the cover can be adjusted, a contact plate which extends in a direction perpendicular to the lower end of the base plate and parallel to the side surface of the grinding wheel and has a flat surface which follows the workpiece, and a contact plate which supports the base plate and protrudes from the grinding wheel cover. This type of cutting attachment is equipped with a fastening means that allows the length to be adjusted and is detachably fixed, and the cutting attachment that can be detached from the grinding wheel cover of this type of disc grinder body can be used to hold the disc grinder body in an optimal position without impeding the normal working function of the disc grinder, and the cutting operation can be performed while moving the cutting attachment's contact plate along the workpiece as a guide, and the cutting depth can be adjusted very easily because the protruding length of the attachment's base plate relative to the grinding wheel cover can be adjusted. This makes it possible to perform cutting operations using the disc grinder safely and smoothly in a very stable state without the wobble of the disc grinder body, and also has the effect of eliminating the problems specific to this type of disc grinder and diversifying the processing operations.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway side view showing the entire disc grinder, Fig. 2 is a side view showing the disc grinder in an upright state, and Fig. 3 is Fig. 2. A-A cross-sectional view of 4th
The figure is a perspective view showing the cutting attachment, and FIGS. 5A and 5B are sectional views showing how each grindstone is attached to the grindstone shaft. 12: grindstone cover, 15: cutting attachment, 16: contact plate, 17: substrate, g: grindstone, g': diamond grindstone.

Claims (1)

[Scope of utility model registration request] The grinder includes a disc-shaped grindstone that is positively rotatably supported on a grindstone shaft in a gear case of a grinder main body, and a grindstone cover that covers approximately half of the grindstone and is rotatably fastened to the gear case. The disc grinder includes a base plate extending parallel to the side surface of the whetstone exposed from the whetstone cover and attached to the whetstone cover so that a protruding length from the cover can be adjusted; and a lower end of the base plate. a contact plate extending in a direction perpendicular to the grinding wheel and parallel to the side surface of the grinding wheel and having an oblique plane along the workpiece; A disc grinder characterized in that it is equipped with a cutting attachment consisting of a fastening means that is removably fixed.