JPS62299304A - Feed water type core drill and auxiliary tool thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a water supply system for a water supply type electric hand drill suitable for drilling relatively large diameter holes in materials such as concrete and walls. The type drill core bit and the hole drill used therewith relate to a body attachment that supplies water to the tip of the core bit during operation.

[Technology background]

In recent years, with the diversification of lifestyles, air conditioners have been installed after construction of houses,
Relatively large holes will be drilled in concrete and walls in order to install outdoor air supply type heaters and construct water supply and drainage pipes.

In this case, conventionally the hole was made by driving with a chisel or a hammer, but nowadays an electric hand drill is used and a diamond or the like of the diameter of the hole is sintered at the tip. Construction work was carried out using a core drill with two core drills with cutting edges.

However, since the core bit of this core drill rotates at high speed, there was a risk that the diamond sintered blade at the tip would wear out, and as the drilling process progressed, the remaining materials such as concrete that had been hollowed out and became cylindrical bodies, As the core bit penetrates into the hollow cylinder, friction between the outer wall of the cylindrical body such as concrete and the inner wall of the core bit causes so-called seizure (referred to as "drill biting"). There were times when the electric drill stopped and was destroyed.

Therefore, a core drill has been proposed in which the diamond sintered blade is cooled and used as a lubricant between it and the workpiece, and water is replenished into the rotating cutting edge to prevent breakage and wear of the cutting edge. There is. FIG. 4 shows such a conventional core drill.

The structure of the type of core drill shown in Fig. 4 consists of a hollow core pit (1) with sintered diamond on the cutting edge, a sponge (2) inserted into the hollow interior with water soaked in it, and a sponge (2) that is used for processing during rotation. It consists of a ##4 oil gap warper, a seal, and a stopper 3 on the 10th stroke.

When using this type of core drill, hold the core bit 1 vertically and pour about half of the water into the core bit 1, then press the sponge 2 that has squeezed out the water, and drill holes in concrete or walls. is pushed out onto the work surface and the hole drilling work is carried out.As the drilling work progresses and the remaining concrete etc. that have been hollowed out are formed in a cylindrical shape within the core bit, the sponge 2 As it grows, it gets crushed and the water it contains gushes out and is supplied to the cutting edge.

However, in order to insert sponge 2 into core bit 1,
When the drill bit of the core bit 1 rotates at high speed, the sponge 2 comes into contact with the workpiece and becomes entangled, making the sponge 2 crumbly and unusable for a long period of time. In addition, to the extent that the sponge 2 contains water, it is difficult to say that the water supplied to a large-diameter driller is sufficient for the work, and the sponge 2 becomes unusable during the drilling work. The disadvantage is that you have to refill the water many times.

In this case, when pouring water onto the core bit 1 from above, pour an appropriate amount of water onto the sponge 2 from just above the sponge 2.
It is necessary to supply water according to the amount of water absorbed by the core bit 1, and if the amount of water supplied exceeds the water content of the sponge 2, water will overflow from the core bit 1 and the electric drill body will become wet. Therefore, there was a risk of electric shock or damage to the drill body. A similar problem also occurs when water is first poured into the core bit 1 and the squeezed sponge 2 is inserted during use, and there is a risk that water will overflow inside.

Therefore, in order to avoid such accidents and wear of the drill blade, a type of electric drill that constantly supplies water into the core bit has been proposed.

FIG. 5 shows such a type of electric drill.

In FIG. 5, reference numeral 4 denotes a water supply holder that is chucked onto a chuck portion 41 of the electric drill, and is provided with a water supply vibrator 5 for supplying water. Also, 1
2 is a drill blade that can be inserted into the water supply holder 4.

The water supply holder 4 and the drill blade 12 each have a fitting part 7.11 consisting of a male type and a female type, so that the drill blade 12 can be easily replaced. When the chuck portion 41 of the electric drill is chucked, the chuck rod 9 of the water supply holder 4 is rotationally driven by the female fitting portion 11 and the male fitting portion 7 connected thereto. Ru.

The supplied water is transferred from the water supply vibrator 5 to the water supply holder 4.
It is configured to pass through the axis of the fitting portion 7 and reach the processing surface from the tip of the drill blade 12.

The internal structure of this water supply holder 4 is shown in FIG. 6, and its outline will be explained.

In FIG. 6, 8 is a waterproof oil seal, 9 is a shaft portion, and a water hole 14 is provided extending from the approximate center of the water supply holder 4 toward the drill blade 12 and connecting to the through groove IO.

In FIG. 6, parts having the same functions as those shown in FIG. 5 are represented by the same reference numerals.

Therefore, in this type of water-fed core drill, the sixth
As is clear from the figure, water enters the water supply holder 4 from the water supply vibrator 5,
Inside the holder 4, the fitting portion 7.11 is passed through the through groove 10 from the water hole provided on the chuck rod 9 of the holder shaft.
And the water groove provided in the drill blade 12! 5 to reach the machined surface and achieve protection of the cutting edge.

[Problem that the invention seeks to solve]

However, in this type of drill, the core bit with a sintered diamond blade is not directly attached to the drill body, so in order to center the shaft portion 9 of the water supply holder 4, both sides of the holder 4 are attached with pole bearings 13. Because it needs to be supported, its structure tends to be complicated, and it also cannot be built cheaply. In addition, since the drill blade 12 is attached to the holder 4 and is not configured to be directly attached to the drill body, the rotational force of the drill is not transmitted accurately.
There is relatively no problem when the hole is machined with a small diameter, but there is a limit when it comes to machined holes with a large diameter.

Further, the drill blade 12 and the water supply holder 4 are joined by a fitting portion formed by a male mold 7 and a female mold li so that they can be inserted, and water is supplied through this fitting portion. Therefore, there is a drawback that water leakage inevitably occurs in this part, and the main body of the electric drill becomes wet, resulting in a loss of work efficiency.

[Means for solving the above problems]

The present invention overcomes these drawbacks of the prior art, is safe, can be manufactured at low cost, can be processed into large diameters, and has a sufficient water supply for precision during processing. The aim is to provide a type drill.

Therefore, the present invention has made it possible to directly attach a core bit with a sintered diamond blade to the chuck part of the original electric drill, and also to attach the water supply part to the case body of the electric drill, making it possible to easily supply water. Features.

In order to achieve these features, the present invention has devised a water supply method for the core bit, so that water is supplied not from the shaft center but from between the different diameter shafts at the rear of the core shaft of the core bit. . That is, two shafts of different diameters are provided at the rear of the core shaft of the core bit, and the shafts penetrate from the plane between the two diameter shafts in the direction of the cutting edge to enable water supply. The outer peripheries of the two diameter shafts on the back are waterproofed with two oil seals, water is supplied between these two oil seals, and the water is guided into the core bit.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to provide a detailed explanation of the present invention, an embodiment will be explained based on drawings.

FIG. 1 is a diagram schematically showing a water supply section of a water supply type drill and an associated core bit according to an embodiment of the present invention. In FIG. 1, 1 is a core bit, 5 is a water vibrator, 6 is a water tap, and 9 is a chuck part 4 of the electric drill.
This is a chuck rod that is chucked into 1. 21 has two different aperture axes at the rear of the core axis of the core bit l.

Reference numeral 22 denotes a work window for attaching the chuck rod 9 of the core bit 1 to the chuck part 41 of the electric drill, and facilitates the attachment work; 23, a water supply unit that supplies supplied water to the core bit 1; and 24, this water supply. The water supply section main body 25.2B, which is fixed to the case cover 42 of the electric drill, is the waterproof oil seal described above.

FIG. 2 shows a conventional example shown in FIG. 6 to facilitate understanding of the water supply state in the water supply section 23 of the water supply type drill according to this embodiment and the core shaft rear section 21 used integrally therewith. FIG. 3 is a schematic configuration diagram corresponding to FIG.

In FIGS. 2 and 3, 30 is a water supply hole penetrated from the water supply part 23 toward the core bit 1, and in this embodiment, the diameter is between two different diameter axes. Three holes with a diameter of 3 to 3.5 mm are provided.

Other same reference numerals indicate the same parts as shown in FIG.

To explain the water supply state in this embodiment, water from the pipe 5 passes through the water supply faucet 6 to the water supply part 23.
to go into. In the water supply section 23, oil seals 25.2 are installed on both sides.
Since the water is stopped at point B, the supplied water is guided to the inside of the core bit l through the water hole 30 provided between the two different diameter shafts of the rear part 21 of the core shaft. It reaches the cutting edge and cools it by immersing it in water, while also acting as a lubricant for the sliding surface between the cutting edge and the workpiece to prevent wear and breakage of the cutting edge.

The working process for drilling a hole using this embodiment will be explained as follows. Fix the water supply part main body 24 to the case cover part 42 of the electric drill, then loosen the chuck part 41 of the electric drill, insert the core bit 1 into the water supply part main body 24, and chuck the chuck rod 9.
is chucked with the chuck part 41 of the electric drill. On the other hand, the pipe 5 and the water tap 6 are connected to a water tank (not shown) so that water is poured into the main body 24 of the water supply section. In this case, the amount of water is adjusted and supplied using the water tap 6, but there is no need to pay special attention to the water pressure, and it is usually sufficient to apply a small amount of water pressure with a mini pump, etc. It is also possible to make it slightly higher and allow it to flow down normally.

Then, when the switch of the electric drill is squeezed, the core bit 1 rotates, and water flows from the water supply section 23 through the water hole 30 on the back surface of the core shaft, into the core bit 1, and reaches the cutting edge.

In this case, the water hole provided in the core shaft rear part 21 is
Since the hole is penetrated toward the core bit 1 at a position deviated from the axis, when the core shaft starts to rotate, water can be efficiently sent into the core bit 1 by its centripetal force.

If a spiral groove is formed on the side wall of the core pit 1, the water flowing from the water hole 00 can easily reach the cutting edge through the spiral groove.

In the embodiment according to the present invention, the cutting edge of the core bit 1 does not need to have any special shape. In other words, even if the tip of the core bit is simply sintered with diamond, there is a notch shape in the normal direction. It is possible to use a commonly used core bit with a gap or a cutting edge with an acute angle cut off at the outer edge of the cut. However, the applicant of the present application has tried various drills and found that the cutting edge having the shape shown in FIG. 7 is the most efficient in drilling when using this water-feed type core drill. To explain this shape of the cutting edge with reference to FIG. 7, it is a cutting edge consisting of about 5 to 8 pieces 1B of sintered diamond,
A gap 17 with a convergence of about 2 to 3 sm and a depth of about 3 mm is provided, and as shown in the figure, a cutting edge in the shape of an angle θ is provided with the gap slightly inclined toward the counter-rotation direction of the core axis. be.

For this reason, compared to a gap that is simply provided at right angles, there is no catch during rotation, and the adhesive area with the machined surface is large, allowing for better excavation. be guided by.

In carrying out the present embodiment, the applicant of the present invention has stated that, since the present invention is particularly for drilling relatively large-diameter holes, it is difficult to determine the positioning at the beginning of machining, and when the hole to be machined is long. Since the machine body may swing sideways and the machined hole cannot be machined perpendicularly to the machined surface, a specially shaped machining aid for use in the present invention was invented. FIG. 8 shows an embodiment of the auxiliary tool.

In FIG. 8, 31 indicates that the auxiliary tool is in front of +
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IJ+ ツ 5 〇1 ＾ し 11 j One is the part, 32 is the flange plate part that presses against the machined surface,
33 is a guide ring provided on both sides of the mounting portion 31;
A guide support rod 34 is fixed to the flange plate portion 32 and slidably attached to the guide ring 33, and is parallel to the core bit l so that the hole to be machined can be drilled vertically. It is something. 35 is a handle attached to the flange plate portion 32 and supported by the operator. After this auxiliary tool is inserted onto the water supply section main body 24, it is firmly attached with screws or the like.

When drilling a hole, an experienced worker may have a firm working position and may not need such aids, but an inexperienced worker may be unable to drill vertically due to being swayed by the drill. Therefore, in the present invention,
It can be freely removed. Note that this auxiliary tool is omitted in this example! Guide support rods 34 are provided at intervals of 40 layers, and the flange plate portion 32 is also proportional to this, but this can be made larger or smaller in proportion to the machined hole, and can be used in one workshop or If the set includes several types of auxiliary tools, they can be replaced depending on the caliber. Note that the size and shape of the flange plate portion 32 are not limited to those in this embodiment.

According to the auxiliary tool according to this embodiment, it is possible to drill relatively large-diameter holes in combination with the above-mentioned water supply type core drill, and it can also be configured integrally with this. Further, even an unskilled person can easily drill holes of any diameter.

〔Effect of the invention〕

According to the water supply drill according to the present invention, water can be constantly supplied to the tip of the diamond sintered blade through a relatively simple step, so the diamond sintered blade is cooled with this water and the cutting edge is It improves the sliding surface between the workpiece and the workpiece, preventing wear and destruction of the blade.

In this case, in this example, compared to the prior art example in which water is supplied from the central axis of the drill blade, the through hole is provided with the axis removed, so that when the core shaft starts rotating, the water is supplied by the circular force. Water is forced to the outside, and water can be supplied to the cutting edge more efficiently than in the conventional example, which is extremely effective in preventing wear and breakage of the cutting edge.

In addition, since the core bit with a sintered diamond blade can be attached directly to the drill body, it is possible to avoid water leakage at the fitting part in the middle as in the conventional case, and it is also possible to transmit the rotational force of the drill. It is also possible to drill holes with high precision, especially when drilling large-diameter holes.

Furthermore, since the drill and drill bit are directly attached, there is no need for a bearing in the water supply holder as in the conventional example, making the structure simple and easy to assemble. can.

Furthermore, by using the power drill auxiliary tool according to the present invention, even an unskilled person can easily position the hole for drilling, and can easily drill a hole perpendicular to the machined surface. It's not difficult.

Furthermore, by using the water supply type core drill and auxiliary tool according to the present invention, it can be easily applied to the collection of so-called test pieces after road paving or block wall construction, which was conventionally done using extremely large-scale equipment. This can significantly improve work efficiency in this area.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the water supply section and core bit of a water supply type drill according to an embodiment of the present invention, FIG. 2 is a schematic diagram of the water supply section main body and the rear part of the core shaft of the embodiment, and FIG. ,
4 is a schematic diagram of a conventional core drill, FIG. 5 is a schematic diagram of a conventional electric drill that continuously supplies water into the core bit, and FIG. 6 is a schematic diagram of the water supply holder of the drill. FIG. 7 is a diagram showing the cutting edge of a specially shaped core bit suitable for use in the present invention, and FIG. 8 is a schematic diagram of a specially shaped machining aid used in the present invention. 1; Core bit, 2: Sponge, 3; Resin washer and stopper, 4: Water supply holder, 5; Water pipe, 6;
Water faucet, 7; Male fitting part, 8; Oil seal, 9: Chuck rod, 10; Penetration groove, 11; Female fitting part, 12; Drill blade, 13;
Bearing, 14; water hole, 15; cutting edge, 18; diamond blade piece, 17; gap, θ; inclination angle, 21; core shaft back, 22; working window, 23; water supply part, 24; water supply part main body,
25.28; * ill seal, 3o: water hole, 31; mounting part, 32: flange plate part, 33 guide ring part,
34 Ni guide support rod, 35; handle patent applicant Takahachi Kikizai Co., Ltd. agent
Patent Attorney (9004) Hitoshi Oryu Figure 2

Claims (6)

[Claims] (1) It has at least two different diameters, and has one or more water holes penetrating in the direction of the cutting edge of the core shaft on the surface between the first diameter and the second diameter, and A core bit having a core shaft rear part connected to a small diameter to form a chuck rod chucked to a chuck part of an electric drill, and of two different diameters of the core shaft rear part, the first diameter is an inner diameter. a first waterproofing means having an inner diameter of a second diameter; a second waterproofing means having an inner diameter of a second diameter; and a second waterproofing means having an inner diameter of On the other hand, a water supply part that holds the water supply part in a rotatable and tightly fitted position; and the water supply part has a mounting part that is attached to the electric drill case cover, and a working window that chucks the chuck rod to the drill chuck part. and a water supply pipe hole is provided between the first and second waterproofing means. (2) The water-feed type core drill according to claim 1, wherein the waterproofing means is an oil seal. (3) The water-supply type core drill according to claim 1, wherein the waterproofing means is an O-ring. (4) The water-fed core drill according to claim 1, wherein the core bit has a spiral groove on its hollow inner wall. (5) The above core bit is made of sintered diamond.
Claim 1, characterized in that the cutting edge has a shape consisting of a cutting edge made up of approximately 8 pieces, and a gap provided between the pieces and inclined on the opposite rotational direction side of the core axis. Water supply type core drill (6) An attachment part for attaching to the water supply part main body, a flange plate part that presses against the processing surface, a guide ring part provided on both sides of the attachment part, and a guide ring part fixed to the flange plate part and attached to the guide ring. An auxiliary tool for an electric hand drill, comprising: a guide support rod that is slidably attached and provided in parallel to the core bit; and a handle that is attached to the flange plate.