JP2000326197A - Dry surfacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide dry surfacer capable of facilitating work operations and of enabling operators to safely perform the operations without being adversely affected physically. SOLUTION: A cup wheel 3 is provided, capable of being detachably mounted to the driving shaft 2 of a power revolving tool. The cup wheel 3 has a mounting non-circular shaped hole 4 at its axial core position, and also has a wheel main body 6 with a grinding edge 5 on its lower surface side. The cup wheel has also a non-circular shaped inserting projection 7 to be engaged with the non-circular shaped hole 4 of the wheel main body 6, and is provided with a cushion ring 11 formed out of a metallic part 9 having an outer brim part 8 faced to the upper surface of the wheel main body 6, and of cushion material 10 to be fitted in an annular recessed circumferential groove 9a formed at the lower surface of the outer brim part 8 of the metallic part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a dry surfacer.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional dry surfacer includes a cup wheel 32 which is detachably attached to a drive shaft 31 of an electric rotary tool (not shown). Wheel body 35 having a non-circular hole 33 at the axial center position and a grinding blade 34 on the lower surface side
And an inner flange 36 provided so that the lower surface thereof is in contact with the upper surface of the wheel main body 35, and a lock nut 37 provided on the lower surface side of the wheel main body 35.

[0003]

However, when performing leveling, chamfering, repairing a building wall surface, peeling off a painted surface, etc., of concrete, building materials, stone materials, etc., a very large impact is generally applied. In a conventional dry surfacer, this impact is transmitted to the construction worker as it is, making the construction work difficult and causing physical damage to the construction worker due to vibration.

Accordingly, an object of the present invention is to provide a dry surfacer which facilitates construction work and allows a construction worker to perform construction work safely without suffering any physical adverse effects.

[0005]

In order to achieve the above-mentioned object, a dry surfacer according to the present invention is a dry surfacer having a cup wheel detachably mounted on a drive shaft of an electric rotating tool; A cup wheel having a non-circular hole for mounting at an axial position and having a grinding blade on a lower surface side; and a non-circular insertion projection fitted into the non-circular hole of the wheel body; A metal portion having an outer flange facing the upper surface of the wheel body, and a cushion fitted into an annular concave circumferential groove formed on the lower surface of the outer flange of the metal portion and pressed against the upper surface of the wheel body And a buffer ring made of a material.

Further, a cushioning material, At a cushion ring of a non-mounted state of fitting the concave peripheral groove of the metal part, the depth of the concave peripheral groove and H _1, of the metal portion of the cushion material when the protruding dimension from the outer flange lower surface was H _2, 1.0 × H
It is set so that ₁ ≦ H ₂ ≦ 3.0 × H ₁ .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a use state of the present invention (a protective cover is not shown). The dry surfacer is detachably attached to a drive shaft 2 (see FIG. 4) of an electric rotary tool 1. A cup wheel 3 is provided.

As shown in FIGS. 2 to 4, the cup wheel 3 has a wheel body 6 having a non-circular hole 4 for mounting at an axial center position and a grinding blade 5 on the lower surface side. A metal portion 9 having a non-circular insertion protrusion 7 fitted vertically into the non-circular hole 4 and having an outer flange 8 opposed to the upper surface of the wheel body 6; And a cushion member (10) fitted into an annular concave circumferential groove (9a) formed on the lower surface and pressed against the upper surface of the wheel body (6).

The grinding blade 5 contains a large number of diamond abrasive grains 12 on the ground surface. The diamond abrasive grains 12 can grind hard materials such as concrete, building materials, and stone materials. The cushion material 10 is made of an elastic member such as rubber or plastic.

Reference numeral 13 denotes a donut-shaped inner flange having a hole 13a, and reference numeral 14 denotes a lock nut having a female screw portion 14a. Drive shaft 2 with hole 13 of inner flange 13
a, hole 11a of buffer ring 11, female thread of lock nut 14
The male screw 2a formed at the tip of the drive shaft 2 is screwed into the female screw 14a of the lock nut 14 by inserting the male screw 2a in the order of 14a.

The cushion member 10 is provided with a concave peripheral groove 9a of the metal part 9.
In the non-attached buffer ring 11 fitted to the
When the depth of a and H _1, the projection dimension from the outer brim portion 8 the lower surface of the metal part 9 of the cushion material 10 was H _2, 1.0 ×
H ₁ ≦ H ₂ ≦ 3.0 × H ₁ is set.

When 1.0 × H ₁ > H ₂ , cushion material
10 can only absorb small impacts. Also, H ₂ > 3.0 ×
When the H _1, the cushion material 10 (the vertical direction) spreads in the circumferential direction by compression, can hardly absorb the vertical impact.

FIG. 5 shows how the cushioning material 10 absorbs a vertical shock. That is, FIG. 5A shows a state where no impact is applied, and FIG. 5B shows a state where the impact is absorbed when an impact is applied. At this time, the cushion material 10 is compressed and deformed by receiving a compressive load in the vertical direction, but the deformation is restricted by the concave peripheral groove 9a. In other words, the reaction force against the compressive load acts in the vertical direction without excessively expanding the cushion material 10 in the circumferential direction, so that the impact is reduced.

It should be noted that the design of the present invention can be changed,
For example, the cross-sectional shape of the non-circular hole 4 and the non-circular insertion protrusion 7 is not limited to the quadrangle in the illustrated example, but may be a hexagon, a shape in which a chord is cut out in a part of a circle, a spline shape, or the like. There may be. The shape of the grinding blades 5 and the position on the lower surface of the wheel body 6 may be any shape.

[0016]

Since the present invention is configured as described above, the following effects can be obtained.

[0017] According to the first aspect, the impact during construction work can be reduced and absorbed. That is, the construction work can be facilitated, and the construction worker can safely perform the construction work without being physically affected by the vibration. According to the second aspect, the impact can be efficiently reduced and absorbed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of the present invention.

FIG. 2 is a bottom view.

FIG. 3 is an exploded view.

FIG. 4 is an assembly view.

FIG. 5 is an explanatory diagram.

FIG. 6 is a cross-sectional front view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electric rotary tool 2 Drive shaft 3 Cup wheel 4 Non-circular hole 5 Grinding blade 6 Wheel main body 7 Non-circular insertion projection 8 Outer flange 9 Metal part 9a Concave peripheral groove 10 Cushion material 11 Buffer ring H ₁ depth dimension H ₂ Projection dimensions

Continued on the front page F term (reference) 3C043 BB01 BB16 CC04 CC13 EE01 3C058 AA04 AA09 AA14 CA01 CB06 CB10

Claims (2)

[Claims] 1. A dry surfacer having a cup wheel 3 detachably attached to a drive shaft 2 of an electric rotary tool 1. The cup wheel 3 has a non-circular hole 4 for attachment at an axial position. A wheel body 6 having a grinding blade 5 on the lower surface side thereof; and a non-circular insertion projection 7 fitted into the non-circular hole 4 of the wheel body 6 and an outer flange opposed to the upper surface of the wheel body 6. A metal portion 9 having a portion 8, a cushion member 10 fitted into an annular concave circumferential groove 9 a formed on the lower surface of the outer flange portion 8 of the metal portion 9 and pressed against the upper surface of the wheel body 6. And a buffer ring 11 comprising: 2. The cushion member 10 is provided with a concave peripheral groove 9 of the metal part 9.
At a cushion ring 11 of the non-attached state of being fitted to a, the depth of the concave peripheral groove 9a and H _1, the projection dimension from the outer brim portion 8 lower surface of the metal part 9 of the cushion material 10 when set to _{H 2, 1.0 × H 1 ≦} H 2 ≦ 3.0 × dry surfacer according to claim 1, wherein the set so that H _1.