JPH0452012Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a core bit that is attached to the tip of a rotating tool such as an electric drill and used for drilling holes in concrete and other processed materials. relates to a water injection device for core bits that cools the cutting edge portion located at the tip of the core bit.

[Conventional technology]

Prior to explaining the present invention, the procedure for supplying water to the water storage section of the water injection device for core bits that has been put into practical use will be explained based on FIG. 4.

In Fig. 4, in order to supply water to the water storage part of the core bit, with the diamond core bit 2 held upward, water 9 is poured directly into the core bit through its opening, and then a guide pin 8 is inserted at the tip of the opening. That is, a guide pin 8 for making it easier to pour water 9 into the cutting edge portion located at the tip of the core bit.
Furthermore, a water-containing elastic body 11 having a pressing plate 12 is inserted.

The conventional technology related to this type of water injection device is
For example, it is described in Public Relations Publication No. 61-16008.

[Problem that the invention attempts to solve]

However, with the conventional water injection device for core bits shown in Fig. 4, each time water is supplied into the diamond core bit 2, the tedious task of holding the rotary tool 1 or the core bit 2 upward with one hand is required. In addition to being forced to do so, there was a drawback that the water 9 could get into the rotary tool 1 unless the water supply was done carefully. In addition, as a measure to prevent water sprinkling, a waterproof cover 1 is attached to the tip of the rotary tool 1.
0, but according to this method, the bulky and large waterproof cover 10 must be provided as an accessory to the rotary tool 1, and moreover, it is not directly related to the core bit. Attaching and detaching the waterproof cover 10 to the rotary tool 1 is troublesome.

In addition, in the conventional water injection device for core bits shown in FIG. There is a problem that the water injector is worn out or chipped, and in such a case, there is also a drawback that the water injecting function of the water injecting device for the core bit is significantly reduced.

The present invention has been developed in consideration of the above points, and its purpose is to make it possible to use a rotary tool or a core bit in an upward direction with one hand every time water is supplied into the core bit, unlike the conventional method. There is no need for the troublesome work of holding the core bit, or the need to attach or remove the waterproof cover on parts of the rotating tool that are not directly related to the core bit, making it easier to supply water to the core bit, and further extending the service life of the water injection member The object of the present invention is to provide a water injection device for core bits that can be greatly improved in terms of ease of use and reliability as a tool.

[Means for solving problems]

The purpose is to provide a core bit which is attached to the tip of a rotary tool and rotates to drill holes in processed materials such as concrete, in which a water tank is removably disposed within the body of the core bit, and the water tank is configured to: It is a cylindrical member with bottoms at both ends, and the outer surface in the longitudinal direction has a bellows shape that can be expanded and contracted, and has a water injection hole for the core bit cutting edge and a tank water supply hole, and the tank water supply hole is provided with a hole closing member that can be attached and detached. This is achieved by

In other words, the present invention focuses on the fact that if the water tank is removably inserted into the core bit, water can be supplied independently of the rotating tool, and the shape and structure of the water tank has been devised. It has been given.

[Effect]

According to the present invention having the above configuration,
The water tank is removably installed inside the body of the core bit, making it easier to supply water to the core bit.
The water tank can be taken out of the core bit and used independently, eliminating the tedious task of holding the rotary tool or core bit upward with one hand every time water is supplied into the core bit, which was the case in the past. Also, there is no need to attach or remove a waterproof cover on a rotary tool part that is not directly related to the core bit, and the workability of supplying water to the core bit is excellent.

Furthermore, according to the present invention, the water in the core bit can be
Since the water is stored in the core bit through a water tank, a measure to prevent excess water from leaking inside the core bit is to use a press plate equipped with a water-containing elastic body 11, as in the conventional core bit water injection device shown in FIG. It is not necessary to make the outer diameter of the water tank almost the same as the inner diameter of the tip attached to the tip of the core bit 2, but the outer diameter of the water tank can be made smaller than the inner diameter of the tip attached to the tip of the core bit. This prevents the outer edge of the water tank from being worn out prematurely by the chips and concrete powder, and as a result, the life of the water injection member can be greatly improved.

〔Example〕

Hereinafter, the present invention will be explained based on an embodiment shown in FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view showing the overall configuration of the water injection device for core bits according to the present invention;
FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a longitudinal cross-sectional view showing how the diamond core bit shown by reference numeral 2 in FIG. 1 is used. The same reference numerals as in the figure indicate the same parts.

1 to 3, numeral 3 indicates a water tank, and the water tank 3 is made of a thin plastic material. Further, the water tank 3 has a cylindrical shape with bottoms at both ends, and has a bellows portion 4 on its outer periphery that is freely expandable and retractable in the longitudinal direction. The outer diameter of the bellows part 4 is predetermined to a size that allows it to be inserted into and removed from the body of the diamond core bit 2, and the bellows shape of the bellows part 4 is determined in accordance with the drilling depth in the workpiece. Capacity, and even water tank 3
An appropriate number of bellows and wall thickness are determined in advance based on the amount of storage inside the container.

As shown in FIG. 2, at the bottom of the tip side of the water tank 3, there is one tank water supply hole 6 in the center, which is large enough to relatively easily supply water 9, and around the tank water supply hole 6. The holes 5 are smaller than the tank water supply holes 6, and there are many water injection holes 5 that do not allow water to fall out just by turning the water tank 3 downward, and that the water 9 spews out in the form of a mist only when the internal pressure becomes high. It is formed. Further, a hole closing member 7 is embedded in the tank water supply hole 6 and is detachable using the elastic force of rubber or the like. Furthermore, a guide pin 8 is provided approximately at the center of the hole closing member 7, as shown in FIG. 3, and as shown in FIG. At the same time, an appropriate gap is provided between the two, and at the same time when the bellows part 4 is compressed, the pressure causes mist water 9 to flow from the water injection hole 5.
A guide pin 8 is inserted to make it easier to pour water 9 into the cutting edge portion located at the tip of the diamond core bit 2 along the path shown by the arrow in FIG. 3.

In the above configuration, before the diamond core bit 2 performs drilling work on the workpiece, the water tank 3 is first taken out from the body of the diamond core bit 2, and the hole closing member 7 is inserted through the tank water supply hole 6 of the water tank 3. pull out. After that, water is poured into the water tank 3 from the tank water supply hole 6 until it is almost full, and the hole closing member 7 is pushed into the tank water supply hole 6 to close the lid. Note that during this time, the diamond core bit 2 only needs to be left in a predetermined position. Then, the filled water tank 3 is inserted into the diamond core bit 2 again to complete the water supply operation.

Regarding the work of injecting water into the cutting edge located at the tip of the diamond core bit 2, as the drilling work progresses, the bellows part 4 contracts and its internal pressure increases, causing the water 9 in the tank 3 to be injected. Water is gradually poured into the cutting edge portion located at the tip of the diamond core bit 2 from the hole 5 in the form of a mist. The water poured into the cutting edge portion located at the tip of the diamond core bit 2 moistens and cools the cutting edge portion of the core bit 2 and the cutting surface of the workpiece.

[Effect of idea]

The present invention is as described above, and as is clear from the description of the illustrated embodiments, according to the present invention, the water tank is removably installed in the body of the core bit, so that water supply work to the core bit can be performed easily. The water tank can be taken out of the core bit and used independently, eliminating the tedious task of holding the rotary tool or core bit upward with one hand every time water is supplied into the core bit, which was the case in the past. Also, there is no need to attach or remove a waterproof cover on a rotary tool part that is not directly related to the core bit, and the workability of supplying water to the core bit is excellent.

Furthermore, according to the present invention, since the water in the core bit is contained in the core bit via the water tank, there is no need to take measures to prevent excess water from leaking inside the core bit, that is, the conventional type core bit water injection device shown in Fig. 4. As shown in FIG. By making the inner diameter smaller than the inner diameter of the tip attached to the tip of the water tank, it is possible to prevent the outer edge of the water tank from being prematurely worn out by the tip and concrete powder, and as a result, the life of the water injection member can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an embodiment of the water injection device for core bits according to the present invention, Fig. 2 is a partially enlarged view of Fig. 1, and Fig. 3 is a diamond core bit shown by reference numeral 2 in Fig. 1. Vertical cross-sectional view showing the state of use, No. 4
The figure is a partial vertical sectional view showing a specific example of a water injection device for core bits that has been put into practical use in the past. 1 is a rotating tool, 2 is a diamond core bit,
3 is a water tank, 4 is a bellows part, 5 is a core bit cutting edge water injection hole, 6 is a tank water supply hole, 7 is a hole closing member, 8
is the guide pin, and 9 is the water.

Claims (1)

[Scope of utility model registration request] In a core bit that is attached to the tip of a rotary tool and rotates to drill holes in processed materials such as concrete, a water tank is removably disposed inside the body of the core bit, and the water tank is a cylindrical cylinder with bottoms at both ends. The member has a bellows-shaped outer surface in the longitudinal direction that is expandable and retractable, and has a water injection hole for the core bit cutting edge and a tank water supply hole, and the tank water supply hole is provided with a hole-closing member that can be attached and detached. Characteristic water injection device for COAVIT.