JP2001113463A - Power tool capable of selecting cutting/cutting-polishing function and dust collecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool capable of solving a problem of a power source, a problem of plural devices and economical efficiency by selectively performing cutting/cutting-polishing and dust collection by using a single device in common. SOLUTION: A general abrasive grain grinding wheel or a super abrasive grain grinding wheel and a blower 20 are detachably and selectably installed on a rotary shaft of a handy type power tool 1, and a dust collecting box 30 and a dust collecting nozzle 40 are provided on the windward side of the blower 20 via a connecting hose 50 when selectively installing the blower 20 on the rotary shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool capable of selecting a cutting / cutting / polishing function and a dust collecting function, and in particular, cutting for cutting or grinding hard and brittle materials such as concrete and stone, and other work materials. The present invention relates to a power tool capable of selecting a cutting / polishing function and a dust collecting function used for cleaning and removing dust such as cutting chips scattered in a work place during cutting / cutting / polishing.

[0002]

2. Description of the Related Art When grinding hard and brittle materials such as concrete and stone, and when working in a place with poor scaffolding such as a construction site, it is desirable from the viewpoint of safety to keep the working environment constantly clean. So, in the past, we purchased a commercial small dust collector,
Although they were brought to the site and used, there were restrictions on small work sites, scaffolds, and the environment, so there were naturally restrictions on bringing in equipment, and bringing in a dust collector with a moderate but heavy weight was shunned. there were.

[0003] In the above-mentioned work at the site, since it is necessary to replace a cutting tool such as a diamond grindstone according to the material of the work material and the type of work, several electric motors are required in consideration of work efficiency. Tools were often brought in, and bringing dust collectors was a factor that kept them away.

Conventionally, as a means for preventing dust such as chips generated during cutting or grinding work from escaping around the workplace, a dust collection bag is directly attached to the cover of the power tool, and A technique has been proposed in which the generated cutting chips and dust are captured in a dust collection bag by using the suction force generated by the rotational force of the blade associated with the driving (Japanese Patent Laid-Open No. 11-13).
No. 8435).

Further, in cutting or grinding with a diamond blade or a cup wheel, a special adapter is provided on a safety cover attached to a power tool, and a hose from a dust collection duct is connected to the adapter to suck in dust generated. Has been

However, in the case of a hand-held power tool provided with a dust suction device, it is necessary to integrate a blade for cutting and polishing with a fan, a dust collector, a connecting hose, and the like. However, the handy type was inconvenient in workability due to problems in handling and weight.

Further, for example, in the technique of attaching a dust collection bag directly to a cover of a power tool, since the dust collection bag is directly attached to the power tool, workability is poor and work is difficult in a narrow work site. There is also a problem that the above inconvenience occurs.

Further, when a special adapter is provided and a hose from a dust collection duct is connected to the adapter to suck in the generated dust, it is indispensable to provide a dust collection duct in advance. However, since the working surfaces (opening surfaces) of both safety covers are open toward the work material, problems such as insufficient dust collection effects cannot be obtained.

[0009]

On the other hand, small dust collectors are:
Due to mechanical limitations in order to reduce the size, it is relatively expensive, and it is economical for small subcontractors etc. to purchase and stock several small dust collectors to bring them to multiple sites. It was a considerable burden and pain. However, consideration of collection of cutting chips etc. not only contributes to work efficiency or quality improvement, but also environmental issues cannot be neglected. Therefore, a low-priced and compact dust collector is desired. Was.

Providing a small dust collector separately from an electric tool for cutting, cutting, and polishing not only requires an economical problem but also requires a plurality of power supplies, and also requires a plurality of power supplies at a work site. It was necessary to bring a power tool.
In particular, in the case of a handy type power tool, there is also a disadvantage that the weight of the driving part is large, and a plurality of power tools need to be moved and each of them needs maintenance.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned inconveniences. By making it possible to selectively use cutting / cutting polishing and dust collection by using one apparatus, a power supply for the power supply can be used. An object of the present invention is to provide a power tool that can solve problems, problems of a plurality of devices, and economy.

[0012]

The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, it is essential to bring them to the site, and a power tool having an excellent rotational force is required at the work site. Focusing on temporarily becoming an idle product, the present invention was completed by devising the rotational force to be diverted to a blower that sucks in dust.

[0013] The object of the present invention is to provide a power tool in which a cutting / polishing and a dust collecting function can be selected according to the first aspect of the present invention. Is detachable, and is selectively attached, and when the blower is selectively mounted on the rotating shaft, a dust collection bag disposed on the leeward side of the blower,
The problem is solved by providing a dust collecting nozzle disposed on the windward side of the blower via a connecting hose.

Further, according to the power tool capable of selecting the cutting / cutting polishing function and the dust collecting function according to the second aspect, a general abrasive grindstone or a superabrasive grindstone and a blower are provided on a rotating shaft of a handy type power tool. A dust collection box, which is detachably and selectively mounted, and which is disposed via a connecting hose on the windward side of the blower when the blower is selectively mounted on the rotating shaft; and a dust collection nozzle. Comprising:
Is solved by

A more specific blower comprises a fan for attaching to the rotary shaft of the electric tool, and a hermetically sealed lid portion which covers the fan and has a suction port and an exhaust port.

Further, the dust collecting bag is provided with a filter function to store the captured dust and prevent the dust from escaping. The dust collection bag may be mounted inside the dust collection box.

According to the present invention, the dust collecting bag or the dust collecting box has a filtering function to store the captured dust and prevent the fine chips from escaping around the work site.

The electric power tool according to the present invention, which can select the cutting / cutting / polishing function and the dust collecting function, is formed into a compact structure by substantially assembling a plurality of parts as described above. Each of them is brought to a predetermined site together with a knife such as a whetstone.

When used in an electric tool for cutting / cutting and polishing, a conventional abrasive wheel equipped with a super-abrasive wheel such as a diamond abrasive or a CBN abrasive or a general abrasive such as an Al ₂ O ₃ or SiC system is used. This is the usage mode as described above, and the work can be performed in the same manner as a power tool for cutting and cutting and polishing.

On the other hand, when collecting dust, first, a cutting and grinding tool such as a diamond grindstone used for cutting and cutting and polishing attached to the rotating shaft is removed.
Also remove the safety cover. Then, the above-mentioned blower is attached to the rotating shaft from which the cutting and grinding tool has been removed, and a dust collecting bag is provided on the leeward side of the blower, and a dust collecting nozzle is attached on the leeward side via a connecting hose, or Assembling by connecting the dust collection box and the dust collection nozzle to the windward side through a connection hose.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 4 show a power tool according to the present invention. FIG. 1 is a schematic exploded perspective view when a cutting / cutting / polishing function of the power tool is used, and FIG. 2 is a dust collecting function of the power tool. FIG. 3 is a schematic exploded perspective view of the power tool when the dust collecting function is used, FIG. 3 is a schematic exploded perspective view of the power tool when the dust collecting function is used, and FIG. FIG. 4 is a configuration explanatory view including a notch.

The electric power tool in this embodiment is configured to be capable of selecting a cutting / cutting / polishing function and a dust collecting function. A hand-held electric power tool 1 and a rotating shaft 2 of the electric power tool 1 are provided with a general abrasive grindstone or an ultra-fine grindstone. The abrasive grindstone and the blower 20 are detachably and selectively attached, and when the blower 20 is mounted on the rotating shaft 2, a connection hose 50 (flexible hose) is provided on the windward side of the blower 20. The dust collection box 30 provided, and further, the dust collection box 30
And a dust collecting nozzle 40 and the like arranged on the windward side of the vehicle.

FIG. 1 shows a power tool for cutting and polishing.
As shown in the figure, the power tool main body 1, a rotary shaft 2 which is an output shaft from an electric motor (not shown) built in the power tool main body 1, and fixed to a base 3 on the outer periphery of the rotary shaft 2. And a cutting / cutting / polishing blade 5 (for example, a diamond wheel or the like) mounted in the safety cover 4. These are the same as the prior art, and the cutting / cutting and polishing blade 5 has a mounting hole 5 in the center.
The mounting hole 5a is fixed to the rotating shaft 2 with a nut 7 via a washer 6. When the cutting / polishing blade 5 is used with the blade being flat against the work material, the pin of the claw wrench is engaged with the engaging hole of the washer 6 without using the nut. 1, a cutting / cutting and polishing blade 5 may be attached.

The safety cover 4 of the present embodiment has a semicircular dish shape, and has a mounting portion 4a formed at an end of the safety cover 4 (a screw hole is formed in the mounting portion 4a of the present embodiment). ) And the connecting member 8 (a screw hole is formed in the connecting member in this example), and the base 3 is clamped and detachable by a fixing tool 9 such as a bolt or a screw screw. Fixed to Although the example of FIG. 1 shows an example in which the safety cover 4 is disposed near the center of the power tool, the position of the safety cover 4 may be adjusted as appropriate, such as by disposing the power tool in the distal direction according to the working state. Is possible. Further, in this example, the example in which the screw holes are formed in the mounting portion 4a and the connecting member 8 has been described.
A simple fool hole may be formed and detachably connected by a bolt and nut as a connecting tool.

As a power tool for collecting dust, a blower 20 and a connecting hose 5 on the windward side of the blower 20 are used.
0 (flexible hose), and a dust collection box 30 provided with a flexible hose 41 disposed on the windward side of the dust collection box 30.

As shown in FIGS. 2 and 3, the blower 20 in this embodiment includes a back cover 21, a fan 22, and a cover 23 as main components, and the fan 22 includes the back cover 21 and the cover 23.
And sandwich it. The materials of the back cover 21, the fan 22, and the cover 23 are not particularly limited as long as they are relatively lightweight and have mechanical strength enough to withstand a certain impact. (FRP), fiber reinforced metal (FRM), etc. can be freely selected.

The back cover 21 of this embodiment has a shallow cylindrical shape with a bottom, and a mounting hole 21b is formed substantially at the center of the bottom. At the outer periphery of the hole 21b, a mounting portion 21a (a screw hole is formed at the mounting portion 4a in this example) is formed, and the mounting portion 21a is connected to the connecting member 8 (the connection of this example). Screw holes are formed in the member)
Using the above, similarly to the mounting of the safety cover 4 described above,
The base 3 is sandwiched and fixed detachably by a fixing tool 9 such as a bolt or a screw screw.

The back lid 21 has an opening on the side opposite to the bottom, and a flange 21d is provided around the outer periphery of the opening. At a predetermined position (four places in this example) of the flange 21d, a connection hole 21e (the connection hole in this example is a screw hole) for joining with a lid 23 described later is formed. An exhaust port 21c is provided at a predetermined position on a side surface of the cylindrical back cover 21 in a tangential direction of the cylindrical back cover 21.

As shown in FIGS. 2 and 3, the fan 22 of this embodiment has a bottom 22a, a propeller 22b, and a bottom 22a.
And a connection hole 22c formed substantially at the center of the frame.
The structure of the fan 22 is based on the number of rotations of the power tool 1 (about 12000).
r · p · m), and any air supply that can sufficiently suck dust typified by cuttings such as stones can be used. It is formed according to a small dust collector. Then, the fan 22 mounts the rotation shaft 2 on the connection hole 22c, and
, So that it is detachably fixed.

As shown in FIGS. 2 and 3, the lid 23 of this embodiment has a disc-shaped plate 23a which is aligned with the flange 21d of the back cover 21, and a substantially central portion of the plate 23a. At a predetermined position near the outer periphery of the plate 23a at a position matching the cylindrical suction port 23b, the reinforcing rib 23c of the plate 23a, and the connection hole 21e formed in the flange 21d. Connection hole 23d (the connection hole in this example is a screw hole).

The attachment between the back cover 21 and the cover 23 is optional as long as the joint (seal) at the joint is sufficient and can withstand vibration during use. This is achieved by tightening bolts into screw holes (female threads) provided in the flange 21d of the flange 21. At this time, the seal of the flange 21d may be provided through any packing such as a gasket.

After the back cover 21 and the blower 22 are fixed to the power tool 1, the connection holes 21e of the flange 21d of the back cover 21 and the connection holes 23d of the cover 23 are aligned and connected with screws and screws. I do.

As shown in FIG. 4, the dust collecting box 30 of this embodiment is connected to a position upstream of the blower 20. There is no particular limitation on the shape and size of the dust collection box 30 of the present example, but it is desirable that the dust collection box 30 be extremely compact for that purpose, and in order to prevent chips and dust sucked into the blower 20 from flowing into the blower 20. A filter 31 for capturing the dust in the dust collection box 30 and preventing the dust from scattering toward the blower 20.
Is provided. The aperture of the filter 31 is an arbitrary range as long as dust or the like can be sufficiently captured. The material of the filter 31 is not particularly limited as long as it has a mechanical strength enough to withstand the impact of sucked stone chips or the like.

It is desirable that the dust collecting box 30 contains a dust collecting bag (not shown) which is easy to remove. The dust collection bag is provided so that the dust collection nozzle 40 side is open, captures and collects sucked chips and dust, and is configured to be removable when filled. And
The removed dust collection bag should be discarded and replaced, or replaced with a spare. The material of the dust collection bag can be freely selected as long as it has strength and air permeability enough to capture and accumulate dust.

Since the dust collection bag itself can fulfill the role of the above-described filter 31, even if the mesh of the filter 31 is coarsened to some extent, the dust collection bag can capture fine dust. it can. On the other hand, the dust collecting box 30 may be provided with a movable caster in consideration of the efficiency and ease of the cleaning operation.

The dust collecting box 30 can be provided alone as described above, but in order to have a more compact structure, it can be directly attached to the suction port 23b of the blower 20 or a flexible hose 41 can be provided.
It is also possible to directly attach to the dust collecting nozzle 40 without using the same or to form an integral structure. With such a structure, the number of parts in the present invention can be reduced.

The structure of the dust collecting nozzle 40 in the present invention is as follows.
Any structure can be used as long as it can sufficiently inhale cuttings and dust such as stones, but it is desirable that the shape be as compact as possible to achieve the object of the present invention. The material constituting the dust collecting nozzle 40 is desirably as light as possible as long as it has sufficient strength against impact and the like, and is usually made of resin such as plastic. It is to be noted that a configuration in which the dust collection box 30 is integrally attached to the leeward side of the dust collection nozzle 40 as described above is also a desirable configuration.

Next, a power tool is specifically used at a work site or the like.
An example in which the cutting / polishing and the dust collecting function are selected will be described. Normally, the power tool 1 is used for cutting and polishing.
The safety cover 4 and the cutting /
A cutting and polishing blade 5 is attached, and performs cutting and cutting and polishing.

When collecting dust, the blower 2
Attachment to the power tool 1 is performed together with the assembly of the power tool. The assembling is performed by firstly cutting / cutting and polishing a blade 5 such as a diamond grindstone used from the rotating shaft 2 of the electric tool 1 to the other.
, And then the safety cover 4 is also removed. The connecting member 8 between the base 3 of the power tool 1 and the safety cover 4 serves as a base and a connecting member for attaching the back cover 21.
Instead, a back cover 21 is attached. The attachment of the back cover 21 is optional as long as the sealing is complete and there is no fear of falling off, but it is usually fastened and fixed using a clamp.

After the back cover 21 is attached, the fan 22 is attached to the rotary shaft 2. This attachment depends on the structure of the rotary shaft 2 in the power tool 1. After the back lid 21 and the fan 22 are attached, the lid 23 provided with the suction port 23b at the center is attached, thereby providing an electric tool having a dust collecting function.

Then, as shown in FIG.
A connection hose (flexible hose) 50 is connected to 3b, and the connection between the flexible hose 50 and the dust collection box 30 is made. On the other hand, an exhaust pipe 60 is connected to the exhaust port 21c so that the exhausted air or the like does not directly hit the cut / polished surface. The exhaust pipe 60 of the present example is formed to be bent at substantially 90 degrees so that the flow direction of exhaust gas can be adjusted. Note that the shape of the exhaust pipe can be appropriately adopted.

The outside diameters of the suction port 23 b of the blower 20, the connection port of the connection hose (flexible hose) 50, and the flexible hose connection port of the dust collection nozzle 40 are equal to the outside diameter of each connection pipe of the dust collection box 30. It must be the same as the diameter and the same as the inner diameter of the flexible hose. Flexible hose 41,
The material and shape of 51 are not particularly limited, but any commercially available flexible hose can be freely selected as long as the strength capable of withstanding the reduced pressure due to the rotation of the blower 20 is guaranteed.

In the above-described embodiment, an example is shown in which the dust collection box 30 is arranged on the windward side of the blower 20, but a dust collection bag may be used instead of the dust collection box 30. . In this case, it is preferable to arrange the dust collection bag behind the blower 20, that is, on the leeward side.
When the dust collection bag is disposed on the leeward side of the blower 20, the dust collection bag is normally directly connected to the exhaust port 21c provided on the back cover 21 of the blower 20, but the dust collection bag is separated from the dust collection bag by a predetermined distance as necessary. It can also be installed at a location and connected by means such as a flexible hose. Further, the dust collection nozzle 40 is connected to a suction port 23b provided in the lid 23 of the blower 20 via a flexible hose.

The size (capacity) of the dust collection bag can be arbitrarily selected according to the conditions of the workplace. The mesh as a filter sufficiently captures micron-order fine dust and reduces its dissipation. It is desirable that the material be in a range that can be prevented beforehand, and that the material has a mechanical strength enough to withstand the wind pressure.

As described above, the power tool capable of selecting the cutting / cutting / polishing function and the dust collecting function according to the present invention is converted into a simple dust collector by using the power tool which is temporarily idle at the work site. It is based on a completely new idea. Therefore, by replacing the dust collecting nozzle and connecting it to a conventionally known special adapter, it is easy to fulfill the function of replacing the dust collecting duct.

In the above embodiment, as shown in FIGS. 2 and 3, the blower 20 composed of the back cover 21, the fan 22, and the cover 23 is assembled at the work site or the like. Although it is configured to be sandwiched between the lid 21 and the lid 23, the fan 22 is assembled in advance so as to be sandwiched between the back lid 21 and the lid 23, and is integrated when the dust collecting function is used. The back cover 21 of the blower 20 and the base 3 of the power tool 1 are joined, and thereafter,
By connecting the rotating shaft 2 of the power tool 1 and the nut 24, the work on site may be reduced. In this case, since the nut 24 needs to be connected to the rotating shaft 2 inside the lid 23, the nut 2 is
It is preferable that a wrench is inserted through the suction port 23b while the wrench 4 is held and screwed to the rotating shaft 2.

(Specific embodiment) A more specific example will be described. Example 1 From the electric tool 1 (model number PDA-100E manufactured by Hitachi Koki Co., Ltd.) used for cutting concrete of 10 years of age,
Remove the 4-inch diamond circular saw blade and safety cover, and attach the safety cover to the base 3,
The back cover 21 was set and fixed with a clamp (not shown). In order to complete the sealing when attaching the back cover 21 to the base 3, a rubber packing is interposed. Next, a fan 22 was fitted to the rotating shaft 2 of the electric tool 1 and fixed with a nut 24 having a reverse screw. Then, the cover 2 is attached to the flange 21d of the back cover 21 via rubber packing.
3 and a screw hole (female screw) of flange 21d
By tightening the bolts 25 to the blower 21e,
Completed the assembly of.

Next, the suction port 23b of the blower 20
And a dust collection box 40 containing a predetermined dust collection bag,
The connection pipe with the blower 20 side is connected by a flexible hose, and then the dust collection nozzle 40 of the dust collection box 30 is connected.
The side connection pipe and the dust collection nozzle 40 were connected by a flexible hose.

The power tool 1 constructed as described above was turned on and operated to clean the mortar chips. Mortar chips are relatively coarse and have a maximum particle size of about 3 mm. On the other hand, fine powders are on the order of several microns, but they are sucked and collected very efficiently, and their performance is comparable to that of a commercially available small dust collector. Demonstrated. In addition, in the specific example 1, since the dust collecting box 30 having a built-in dust collecting bag having a filter function is provided on the windward side of the blower 20, damage to the fan due to cutting waste having a coarse particle diameter can be prevented. Was prevented. In this example, the total weight is about 0.5K
g and volume were also extremely compact.

Example 2 After the assembly of the blower 20 was completed in the same manner as in Example 1,
A 2-liter capacity nonwoven fabric dust collection bag was fixed to the exhaust port 21c of the blower 20, and a dust collection nozzle was connected to the suction port 23b via a flexible hose.

The power tool 1 constructed as described above was turned on and operated to clean the concrete cutting waste. Although the maximum particle size of the shavings was about 1 mm and the average particle size was several microns, the dust was suctioned and collected very efficiently, and was comparable to a commercially available compact dust collector. In this specific example 2, the total weight was about 0.3 kg, and the volume was also extremely compact.

[0053]

The power tool according to the present invention, which can select a cutting / polishing function and a dust collecting function, is lightweight and compact, so that it can be easily brought to a high place or a narrow work space. In addition, since the power tool used for operations such as cutting and grinding can be diverted from being temporarily idle at the work site as it is, without having to bring a relatively heavy, expensive and bulky small dust collector to the work place. In addition, the economic burden of preparing a plurality of units according to the work site is eliminated.

As is clear from the embodiment, in a power tool capable of selecting a cutting / cutting / polishing function and a dust collecting function according to the present invention, when collecting dust, a dust collecting bag or a dust collecting box is connected to a wind of a blower. Depending on whether it is placed on the lee or on the downwind side, it can be selectively used for cleaning only dust of fine powder and cleaning relatively coarse chips. Further, the dust collecting duct in the safety cover with a special adapter that has been put into practical use can be easily fulfilled.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view when using a cutting / cutting / polishing function of a power tool according to the present invention.

FIG. 2 is a schematic exploded perspective view when the dust collecting function of the power tool according to the present invention is used.

FIG. 3 is a schematic exploded perspective view of the power tool according to the present invention, in which the dust collecting function is used, the angle being changed from that of FIG. 2;

FIG. 4 is a configuration explanatory view including a partially cut-away portion of a power tool when a dust collecting function is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power tool 2 Rotating shaft 3 Base 4 Safety cover 4a Attachment part 5 Rotating blade 5a Attachment hole 6 Washer 7 Nut 8 Connecting member 9 Fixture 20 Blower 21 Back cover 21a Attachment part 21b Attachment hole 21c Exhaust port 21d Flange 21e Connection hole 22 Fan 22a Bottom part 22b Propeller 22c Connection hole 23 Lid 23a Plate 23b Suction port 23c Reinforcement rib 23d Connection hole 24 Nut 30 Dust collection box 31 Filter 40 Dust collection nozzle 41 Flexible hose 50 Connection hose (flexible hose)

Claims (4)

[Claims] 1. A general abrasive or superabrasive grinding wheel and a blower are detachably and selectively mounted on a rotating shaft of a handy type electric tool, and the blower is selectively mounted on the rotating shaft. A cutting / grinding machine provided with a dust collecting bag arranged on the lee side of the blower and a dust collecting nozzle arranged on the lee side of the blower via a connecting hose. A power tool with a selectable function and dust collection function. 2. A general abrasive or superabrasive grinding wheel and a blower are detachably and selectively mounted on a rotating shaft of a handy type electric tool, and the blower is selectively mounted on the rotating shaft. In this case, a dust collecting box arranged on the windward side of the blower via a connecting hose, and a dust collecting nozzle are provided, and a cutting / cutting polishing function and a dust collecting function can be selected. tool. 3. The air blower according to claim 1, wherein the blower comprises a fan for attaching to the rotating shaft of the power tool, and a closed lid which covers the fan and has a suction port and an exhaust port. An electric tool capable of selecting a cutting / cutting / polishing function and a dust collecting function according to item 1 or 2. 4. The dust collecting bag or the dust collecting box includes:
4. An electric motor capable of selecting a cutting / cutting / polishing function and a dust collecting function according to claim 1, wherein a filter function is provided to store the captured dust and prevent its escape. tool.