JPH0129028Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dust collector for preventing dust from scattering when a hole is mainly drilled in a concrete surface using a hand-held drilling machine.

[Prior art]

As a conventional example of this type, there is a chip cleaning device for an air drill described in Japanese Utility Model Application Laid-Open No. 51-82093. This involves positioning the suction hole of the flexible tube at the tip of the drill, and connecting the rear end to a short tube configured with a jet pump.
It uses an air jet to generate suction force in the suction tube. The chips were stored in a chip receiving bag behind the short pipe.

Another prior art example is a slime discharge device for a drilling drill described in Japanese Utility Model Application No. 100901/1983. This device has a hollow part inside the drill bit along the axis of the drill bit, and the rear end is turned into an inverted L.
It was formed in the shape of a letter and had an opening on its outer circumferential surface. An annular space was formed to face the rotation trajectory plane of the opening, and a hose coupler was communicated with the space to be connected to the suction device.

〔problem〕

However, the first conventional example had a drawback in that it was not possible to remove concrete dust from the bottom of the drilled hole. Furthermore, according to the second cited example, manufacturing the drill bit, which is a consumable item, is troublesome.
That is, since the hollow part along the axis of the drill bit needs to be formed in an inverted L shape at the rear end, the hollow part needs to be formed from the center of the drill tip, and the shape of the drill tip does not have to be special. I didn't get it. Furthermore, when this drill bit is used for concrete drilling work, the inverted L-shaped bent portion at the rear end tends to become clogged with dust. However, removing such blockages is extremely troublesome. Another disadvantage is that it is relatively troublesome to attach and detach the disposable drill bit.

[Means for solving problems]

Therefore, in the present invention, in order to eliminate the above-mentioned problems, the drill part and the taper adapter are constructed separately, and the dust suction path 3 of the drill 1 is simplified, and its construction is as follows.

That is, a support member 31 is provided protrudingly on the outer periphery of the cylindrical drill holder 2, and the support member 31 is connected to the drilling machine main body 17.
be configured so that it is supported by The outer periphery of the tip end of the taper adapter 15 is rotatably supported on the inner surface of the drill holder 2 around its axis, and a long hole 16 is formed in the outer periphery of the taper adapter 15 . At the same time, a tapered hole reaching the elongated hole 16 is opened in the tip surface of the tapered adapter. The rear end of the taper adapter 15 is fitted onto the rotary drive shaft 10 installed inside the drilling machine main body 17. Further, the rear end portion of the drill 1 is detachably fitted into the tapered hole of the tapered adapter 15.
At the same time, one end of the dust suction path 3 opens at the rear end surface of the drill 1, and the other end opens at the tip. Further, an annular groove 18 is formed on the inner surface of the drill holder 2 opposite to the rotation locus plane of the opening of the elongated hole 16 of the taper adapter 15. Then, a connection opening 19 is opened on the outer surface of the drill holder 2 so as to communicate with the groove 18. The communication pipe 4 is connected to the connection opening 19.
One end thereof is connected, and the other end is connected to a dust suction means having a dust collection filter.
This dust suction means has a jet pump-like mouthpiece 6. The other end of the communication pipe 4 is connected to the dust suction side of the cap 6. This jet pump-like mouthpiece 6 is formed as a whole into a relatively short T-shaped merging joint, and an air jet flow passage is formed on the axis inside the mouthpiece. Along with that,
The dust suction passage, which is at an acute angle with respect to the axis on the upstream side of the air jet flow passage, communicates with the flow passage, thereby forming a T-shaped confluence portion 5 therein. The other end of the duct hose 28 is detachably connected to the downstream outer surface of the T-shape, and one end of the hose 28 is connected to a dust collection filter. Further, the other end of an air hose 29 is connected to the air jet suction path side of the cap 6, and one end of the hose 29 is connected to a high pressure air source. Further, the connection end of the jet pump-like mouthpiece 6 on the duct hose 28 side is configured to remove the hose 28 and close the opening of the mouthpiece 6, thereby causing high-pressure air to flow back into the dust suction path 3 in the drill 1. It is characterized in that it is formed so that dust clogging in the drill 1 can be removed.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

The dust collector according to the embodiment of the present invention has a drill 1.
As shown in FIG. 2, a tip 12 is provided protruding from the tip, and a suction opening 13 is provided at a position slightly away from the protruding position of the tip 12. At the same time, a dust suction path 3 communicating from the suction opening 13 to the base end surface of the drill is bored. The outer circumferential surface of the proximal end of the drill 1 is formed into a tapered shape, and that portion is removably fitted into the tapered hole of the taper adapter 15. A rear end portion of the tapered adapter 15 is connected to the rotary drive shaft 10. One or more elongated holes 16 are formed on the circumferential surface of the tapered adapter 15.
is bored in communication with the tapered hole of the tapered adapter 15. It goes without saying that the teeth of the drill can be extracted by driving an ejector into the elongated hole 16, as is clear from the figure. Then, this long hole 16 and drill 1
It communicates with the dust suction path 3. Further, the outer periphery of the tip end of the taper adapter 15 is rotatably supported by the drill holder 2, and a support portion 31 protruding from the outer periphery of the drill holder 2 is fixed to the drilling machine main body 17.
An annular groove 18 is formed on the inner peripheral surface of the drill holder 2 so as to face a portion where the elongated hole 16 of the taper adapter 15 rotates. A connecting opening 19 of the drill holder 2 communicates with the groove 18, and a connecting pipe portion 20 is formed therein. The connecting pipe portion 20 is provided to protrude from the outer surface of the drill holder 2.
The connecting pipe portion 20 may be inclined from the rear end of the tapered adapter 15 as shown in the figure, or may be perpendicular to the axis of the tapered adapter 15. By tilting it as described above, the communicating pipe 4 connected thereto can be guided so as not to interfere with the drilling operation. next,
One end of a communication pipe 4 made of an air hose is fitted onto the outer circumferential surface of the connecting pipe part 20 and fixed with a hose band 21. Then, the other end of the communication pipe 4 is fitted into the suction pipe connection part 22 of the jet pump-like mouthpiece 6, and fixed with the hose band 21. Next, as shown in FIG. 3, the jet pump-like mouthpiece 6 has a mouthpiece main body 23 formed in a U-shape and a merging portion 5 formed therein. Then, the inclined pipe part is used as the suction pipe connection part 22, and the nozzle 25 is connected to the upstream side of the straight pipe part 24.
is inserted and fixed. Furthermore, a duct hose fitting portion is formed on the outer peripheral surface of the mouthpiece body 23 on the downstream side of the confluence portion 5. Incidentally, since the jet pump-like mouthpiece 6 has the above-described structure, it can be manufactured to be extremely lightweight. 1, one end of the air hose 27 is connected to the inlet side of the nozzle 25 via the coupler 26, and the air hose 27 is
A construction air header (in this embodiment, the internal pressure is
Kg/ ^cm2 ). Then, one end of the duct hose 28 is fitted onto the outer periphery of the downstream side of the cap body 23,
It is fixed with a hose band 21. Further, a plug filter as the filter 8 is detachably attached to the other end of the duct hose 28 by means of a hose band 21. The filter is as shown in Fig. 1.
It has a hose attachment part 29 at one end, and a dust outlet 30 at the other end. The dust outlet 30 can be opened and closed by attaching and detaching the fastener 7. As the filter 8, a paper bag, cloth bag, or other flexible material is mainly selected. It should be noted that the present invention is of course not limited to the above embodiment, and for example, the filter 8 may be attached to the communication pipe 4. Further, the communication pipe 4 and the jet pump-like mouthpiece 6 may be integrated. Furthermore, the opening of the suction pipe connecting portion 22 of the jet pump-like mouthpiece 6 may be formed so as to surround the entire circumferential surface of the tip of the nozzle 25.

[Effect]

Next, the operation of the dust collector of this embodiment will be explained. First, this device is connected to the drilling machine main body 17 and the high pressure air source 9 as shown in FIG. Then, compressed air flows into the jet pump-like mouthpiece 6 through its nozzle 25.
The liquid is ejected from the jet pump and generates negative pressure near the tip of the nozzle 25 in the jet pump-like mouthpiece 6. Therefore, the communication pipe 4 and the dust suction path 3 become under negative pressure.
Then, during concrete drilling work, the concrete dust generated at the tip of drill 1 is transferred to drill 1.
The dust is sucked from the tip opening, and the dust is sucked into the suction path 3 and the communication pipe 4.
The dust passes through the jet pump-like mouthpiece 6, where the dust is carried by the jet air flow into a duct hose 28 and collected in a filter (bag filter) 8. Then, only the air from which dust has been removed is directly released from the outer periphery of the filter 8 to the atmosphere. In this manner, when one drilling operation is completed, the air hose 27 communicating with the high-pressure air source 9 and the drilling machine main body 17 are moved to sequentially drill new holes.
In addition, if the second drilling position is relatively far from the first drilling position, the air hose 27 communicating with the first high pressure air source 9 is removed from the high pressure air source 9 via its coupler 26. . The drilling machine main body 17 and the extremely light jet pump-like mouthpiece 6 and filter (bag filter) 8 attached thereto.
Move only. Next, the second high-pressure air source 9 may be newly connected to the jet pump-like mouthpiece 6 with an air hose 27. Furthermore, when the filter 8 is filled with concrete dust, the fastener 7 attached to the end thereof may be removed and the concrete dust may be disposed of at a predetermined location through the dust outlet 30. Next, if the dust suction passage 3 becomes clogged with concrete dust during drilling work, first remove the duct hose 28 from the jet pump-like mouthpiece 6, and close the opening with the worker's palm or with an appropriate cap. do. Then, high-pressure air flows back through the dust suction path 3 and blows away concrete dust, etc. in the dust suction path 3, thereby removing the blockage in the dust suction path 3. However, if the blockage at the rear end of the drill 1 is still not cleared, the drill 1 may be removed from the taper adapter 15 and cleaned.

[Effect of idea]

The dust collector for a hand-held drilling machine according to the present invention has the above-mentioned configuration and has the following effects.

(1) The drill 1 of this device has a dust suction path 3 opened on its rear end surface, and the outer circumferential surface of the rear end of the drill 1 is configured to be detachably fitted into a tapered hole of a tapered adapter 15. There is. The construction is such that dust is sucked through the dust suction path 3 of the drill 1, the elongated hole 16 of the taper adapter 15, the groove 18 of the drill holder 2, and the connection opening 19. Therefore, first, the drill 1 can be manufactured easily. That is, since it is sufficient for the drill 1 to have the dust suction path 3 opened at the rear end surface, the dust suction path 3 is simplified and can be easily manufactured, and as a result, the drill 1, which is a consumable item, can be provided at low cost.

(2) At the same time, since the rear end of the drill 1 is formed to be removably attached to the taper hole of the taper adapter 15, even if the curved part that communicates the dust suction path 3 and the elongated hole 16 is clogged with dust. By removing the drill 1 from the taper adapter 15, the dust clog can be easily cleaned.

(3) Furthermore, since the drill 1 can be removably fitted to the taper adapter 15, holes with various inner diameters can be drilled by simply replacing drills 1 of various external shapes with the taper adapter 15 and fitting them. I can do it. At the same time, the damaged drill 1
can be easily and quickly replaced. Furthermore, when removing the drill 1 from the taper adapter 15, it can be easily removed by driving an ejector into the elongated hole 16. That is, the elongated hole 16 has the rationality of being able to serve both as a dust suction path and a hole for extracting the teeth of a drill, making it possible to provide a trouble-free dust collector with a simple configuration.

(5) Furthermore, in this device, since the jet pump-like mouthpiece 6 is entirely formed in the shape of a relatively short T-shaped merging joint, the duct hose 28 can be easily attached and detached. Since the opening of the attachment/detachment part is configured to be able to be closed, high-pressure air is thereby circulated through the dust suction path 3 in the drill 1.
This has the effect that dust clogging in the drill 1 can be removed very easily.

(6) Furthermore, since the jet pump-like mouthpiece 6 of the present device has a merging portion 5 formed at an acute angle in a T-shape, the suction effect is high and dust can be collected reliably. Furthermore, since the cap 6 is formed as a relatively short T-shaped merging joint, it is lightweight, the ends of the duct hose 28, etc. can be easily attached and detached, and a device with easy start-up can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, FIG. 1 is an explanatory elevational view thereof, FIG. 2 is a partial sectional view of the main part of a drilling machine to which this device is applied, and FIG. 3 is a diagram showing the device. FIG. 1... Drill, 2... Drill holder, 3... Dust suction path, 4... Communication pipe, 5... Merging section, 6...
Jet pump-like mouthpiece, 7... Fastener, 8... Filter, 9... High pressure air source, 10... Rotation drive shaft, 12... Chip, 13... Suction opening, 15
... Taper adapter, 16 ... Long hole, 17 ...
Drilling body, 18... groove, 19... connection opening,
20... Connection pipe section, 21... Hose band, 22
... Suction pipe connection part, 23 ... Base body, 24 ...
Straight pipe section, 25...nozzle, 26...coupler, 2
7...Air hose, 28...Duct hose, 2
9...Hose attachment part, 30...Dust outlet, 31
...Supporting member.

Claims (1)

[Scope of utility model registration request] A cylindrical drill holder 2 is supported by a drilling machine body 17 and has a support part 31 protruding from the outer periphery, and the outer periphery of the tip part is rotatably supported on the inner surface of the holder 2 around its axis. The rotary drive shaft 10 has a long hole 16 formed therein, and a tapered hole reaching the long hole 16 opens at the tip surface, and is installed inside the main body 17.
A taper adapter 15 whose rear end fits into the taper hole, and a dust suction path 3 whose rear end removably fits into the tapered hole, one end opening at the rear end surface and the other end opening at the tip. A drill 1 extending along its axis, a groove 18 annularly formed on the inner surface of the holder 2 facing the rotation locus plane of the opening of the elongated hole 16, and a groove 18 formed in the holder 2 so as to communicate with the groove 18.
a connection opening 19 opened on the outer surface of the
One end of the communication pipe 4 is connected to the opening 19, and the other end is connected to the dust suction path side of a jet pump-shaped mouthpiece 6, and the jet pump-like mouthpiece 6 has a relatively short T-shaped merging joint shape as a whole. An air jet flow passage is formed on the axis of the air jet flow passage, and the dust suction passage, which is at an acute angle with respect to the axis on the upstream side of the air jet flow passage, communicates with the flow passage. A T-shaped merging section 5 is formed, one end of which is connected to a dust collection filter, and the other end of a duct hose 28 is detachably connected to the downstream end of the T-shape. One end of an air hose 27 is connected to a high-pressure air source, and the other end of the air hose 27 is connected to the duct hose 28 side of the jet pump-like mouthpiece 6, and the hose 28 is removed to close the opening of the mouthpiece 6. A dust collector for a hand-held drilling machine, which is configured to allow high-pressure air to flow back into the dust suction path 3 in the drill 1 to remove dust clogging in the drill 1.