JP2001259960A - Dustproof cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dustproof cover without exposing dust inside of the dustproof cover to the outside even when a clearance between the dustproof cover is produced or when a space inside of the dustproof cover becomes small according to the process of boring work. SOLUTION: The dustproof cover is provided with a bellows body 1 flexibly arranged from the tip of a drill 3B to a base and thereof so as to cover the drill surroundings, having the opened tip 1B and the base end 1A, and a flange member 2 arranged in the opening of the base end 1A in this bellows body 1, having a through hole 2F for inserting the drill into the center. In this flange member 2, a suction port 2h with a base end connected with a suction device by a connection pipe is provided, and this suction port is also communicated with inside of the bellows body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill, an annular cutter, and the like (a "drill"
The present invention relates to a dustproof cover that is attached to cover the periphery of the drill so that dust generated by the drilling operation is not diffused around.

[0002]

2. Description of the Related Art There are many cases in which a drill is used to drill a floor, a wall or a ceiling plate. In this case, conventionally, the worker wears dust-proof glasses for work so that dust and the like do not enter the eyes, and wears a dust-proof mask or the like so as to prevent dust from entering the lungs and the like.

[0003] However, in the above-mentioned drilling work, the surroundings of the drilled portion are contaminated with dust, so that curing before the work and cleaning work after the work are necessary.

[0004] In view of such a situation, a dustproof cover made of a bellows body that covers the periphery of a drill is currently provided.

According to the provided dustproof cover,
During the drilling operation, the periphery of the drill is exclusively sealed as much as possible, and after the operation, dust accumulated in the dustproof cover is discharged to a bag or the like.

For this reason, in the case of the above-described dustproof cover, when the drilling work progresses with the passage of time and the internal space gradually narrows, the pressure inside the dustproof cover is reduced by the surrounding pressure. When it becomes higher, dust inside leaks out, or when a gap is formed between the tips of the dustproof cover that is in contact with the surface of the wall or the like that is being drilled due to vibration of a vibration drill, etc. The dust spreads from the gap to the outer peripheral area.

Further, when the dust collected in the dust cover is transferred to a bag or the like after the drilling operation, the dust is also scattered around.

Furthermore, when drilling work on the ceiling surface, the work must be performed while the electric drill is held facing the ceiling. The burden was to be imposed.

The present invention has been made in view of such a situation, and even if a gap is formed between a dustproof cover and a surface such as a wall to be drilled, or in accordance with the progress of the drilling operation. Even if the space inside the dust-proof cover is narrowed, the dust inside the dust-proof cover does not scatter outside and contributes to reducing the physical burden on the worker. The purpose is to do.

[0010]

A dustproof cover according to the present invention comprises a bellows body which is extendably and contractably arranged to cover the periphery of the drill from the tip end to the base end thereof, and has an opening at the tip end and a base end, and a base of the bellows body. And a flange member provided with a through hole for inserting a drill in the center, the base end being connected to the suction member via a connection pipe. A suction port is provided, and the suction port communicates with the inside of the bellows body.

According to the dust cover thus configured, dust generated during the drilling operation is sucked from the suction port toward the suction device, so that the space inside the dust cover is gradually narrowed. Also, even if a gap is created between the tip of the dust cover and the wall, etc. due to vibration of a vibration drill or the like, the inside of the bellows body is always at a negative pressure compared to the surroundings (atmospheric pressure). The dust can be collected from the inside of the dustproof cover to the suction device side. Therefore, it is possible to completely eliminate the possibility that dust generated by the drilling work enters or sucks into the eyes of the worker, and also completely prevents the surroundings of the drilling work from being soiled. Furthermore, according to the dustproof cover according to the present invention, since the inside of the dustproof cover is under negative pressure, when drilling work on the ceiling surface by the electric drill, the electric drill is completely hung by the dustproof cover or close to it. Because of the state, the physical burden conventionally imposed on the operator for holding the electric drill is eliminated or the physical burden is reduced. Of course, when drilling work on vertical walls,
The force for holding the electric drill will be reduced.

In the dustproof cover, the flange member has a first abutting surface at a distal end thereof, which abuts a flange portion provided at a proximal end portion of the drill from a proximal end side, and the flange member has a first abutting surface. At the base end, a second abutment surface is provided.
The contact surface is configured to abut on a locking ring fitted into a locking groove provided on a drill side portion protruding from the flange member to the base end side in a set state, By removing the locking ring, a configuration can be realized in which the dustproof cover can be easily attached to or removed from the drill side.

[0013] In the dustproof cover, the flange member may have a core body that rotates integrally with the drill side and a base part that slides on the core body, and the suction port is formed in the base part. With such a configuration, the core portion on which the external force due to rotation acts is made of a highly durable metal, and the base portion on which a relatively large external force does not act can be made of resin. In particular, if the base having a suction port and a relatively complicated shape is made of resin, by molding using a mold, etc.
This is also advantageous in that it can be mass-produced at low cost.

In the dustproof cover, one of the base end face of the core body and the tip of the base has a ring-shaped groove, and the other has a ring-shaped lip inserted into the ring-shaped groove. When one of the lip portion and the portion in contact with the lip portion is made of metal and the other is made of a bearing member that rotatably holds this metal in a low friction state, the rotation of the drill causes Since the abrasion of the sliding contact portion can be prevented, the durability is increased, and the configuration is excellent in that the generation of a gap in the sliding contact portion due to the wear can be prevented. In this manner, the ring-shaped groove and the ring-shaped lip inserted into the ring-shaped groove have one on the base end face of the core body,
The other can be provided at the tip of the base.

Further, in the dustproof cover, the outer periphery of the core body is configured to be smaller than the opening at the base end of the bellows body, so that the distal end surface of the base is exposed to the bellows body side, and this exposed surface is formed. In addition, when the end of the suction port is open, an extra space (dimension) for providing the suction port is not required, which is excellent in that it can be made as compact as a conventional dustproof cover. Configuration.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dustproof cover according to an embodiment (example) of the present invention will be described by taking an example of an annular cutter which is a kind of the "drill" generically referred to as "drill" in this specification. explain.

FIG. 1 is a partial sectional view showing the entire structure of the dustproof cover according to the present embodiment, showing an internal structure, FIG. 2 is an enlarged sectional view showing the structure of a flange member, and FIG. FIG. 4 is a plan view showing a configuration of a plane of a flange member.

1 to 3, the dustproof cover has a bellows body 1 and a flange member 2 for closing an opening on the base end side of the bellows body 1. The flange member 2 has a through hole 2F at the center for inserting a drill (in this embodiment, a shank portion 3A of the drill 3), and in this embodiment, the flange member 2 has a base 2A and a base 2A. It is constituted by a core body 2B. In this embodiment, as shown in FIG. 4, the drill 3 has a drill body 3 </ b> B contributing to drilling and a base end of the drill body 3 </ b> B attached at a distal end, and the electric power drill side is attached to the base end. And a shank 3A having a mounting portion 3n to be attached.

In this embodiment, the bellows body 1 shown in FIG. 1 is made of a substantially transparent resin so that the inside of the bellows body can be visually recognized, and is shown in FIGS. 4 and 5. Thus, it is configured to be entirely expandable and contractible in the longitudinal direction. As shown in FIG. 4, the inner diameter and length of the bellows body 1 are configured to be large enough to accommodate the drill body 3B. In particular, the length is slightly longer than the entire length of the drill body 3B in a state before contraction. As shown in FIG. 1, a base end (upper end in FIG. 1) 1A and a distal end (lower end in FIG. 1) 1B of the bellows body 1 are open. The base 1A of the bellows 1 has a ring-shaped fitting portion 1a for fitting to the base 2A of the flange member 2, and the inner periphery of the fitting portion 1a
The fitting portion 1a is configured to be equal to (accurately slightly smaller than) the cylindrical fitting portion 2a of the base 2A to which the fitting portion 1a fits.
The fitting portion 1a of the bellows body 1 is a bellows portion 1 on the tip side.
The diameter is smaller than C.

As shown in FIG. 2 in an enlarged manner, a ring-shaped groove 2b is formed on the base end surface of the core body 2B of the flange member 2, and the ring-shaped groove is formed on the front end surface of the base 2A. A ring-shaped lip portion 2c to be inserted into 2b is formed. The inner peripheral wall of the ring-shaped groove 2b of the core body 2B is dimensionally higher than the outer peripheral wall.
The inner peripheral wall of b extends toward the base end side as compared with the outer peripheral wall side, and is configured to slide on the inner peripheral surface of the ring-shaped lip portion 2c of the base 2A. That is, in the case of this embodiment, the bottom surface 2 of the ring-shaped groove 2b of the core body 2B
d is the tip surface 2e of the ring-shaped lip 2c of the base 2A.
Also, the inner peripheral surface 2f of the ring-shaped groove 2b is configured to be in sliding contact with the inner peripheral surface 2g of the ring-shaped lip portion 2c of the base 2A. The whole of the core body 2B is made of steel. Further, a portion forming the tip surface 2e and the inner peripheral surface 2g of the ring-shaped lip portion 2c of the base 2A is constituted by a ring-shaped oilless metal 2E made of a separate member. That is, most of the base 2A is made of resin (for example, “nylon resin”, “ABS resin”, “polypropylene resin”, “polyethylene resin”, or the like, or mixed with reinforcing fibers such as glass fiber or carbon fiber). The oilless metal and a ball bearing described later are provided only in the sliding contact portion where durability and low friction performance are required.

By the way, as shown in FIGS. 1 and 2,
Approximately 45 outwards from a substantially central portion of the base 2A in the height direction.
The suction port 2h is formed obliquely at an angle of degrees. The distal end 2r of the suction port 2h is open at a position where the base 2A is exposed to the distal end side with the core 2B attached to the base 2A. The planar shape of this opening is such that it forms a ring-shaped part, as shown by the broken line Q in FIG. 3, so that a sufficient opening area can be obtained. In addition, as shown in FIGS.
The cylindrical fitting portion 2a is formed at a position slightly closer to the front end side than the center in the height direction of A, that is, at the same height position as the position where the front end of the suction port 2h is formed. I have. In the outer peripheral surface of the fitting portion 2a, an inverted L-shaped engagement groove 2j (see FIG. 4) opened toward the distal end is provided at a plurality of locations (4 in this embodiment) at equal intervals on the peripheral surface. Location) is formed. Corresponding to this locking groove 2j, a rectangular locking projection 1j is formed on the inner peripheral surface of the fitting portion 1a of the bellows body 1.
(See FIG. 1). As shown in FIG. 2 on an enlarged scale, a core body 2B of the flange member 2 has a first member.
The contact surface 2k is formed so as to contact from the base end side with a contact surface 3a formed upward at the lower end of the shank portion 3A. In this embodiment, the base 2A of the flange member 2 is located at a position closer to the base end side from the contact surface 2k.
A second contact surface 2m is formed on the upper end of the second contact surface. This second
2m is formed by the upper end surface of the inner race of the ball bearing 2D disposed at the center of the upper end of the base 2A. In this ball bearing 2D, the inner race 2w abuts on the outer peripheral surface of the shank portion 3A, the outer race 2x is fitted to the base end portion made of resin of the base portion 2A, and rotatably supports the shank portion 3A. ing. That is, the shank portion 3A is connected to the ball bearing 2D,
The ring-shaped oilless metal 2E is supported so as to be able to rotate smoothly in a low friction state.

A locking groove 3b for locking the locking ring 4 is provided on the outer peripheral surface of the shank portion 3A so as to correspond to the second contact surface 2m.

A polygonal locking wall 3c is formed on the inner periphery of the abutment surface 3a of the shank portion 3A, which is provided on the base end side from the abutment surface 3a and which is polygonal in plan view. Further, a polygonal locking wall 2n is provided on the inner peripheral surface of the core body 2B corresponding to the planar shape of the locking wall 3c.

As shown in FIGS. 4 and 5, a center drill 3s constituting a part of a drill body 3B is provided at the center of the lower end of the shank 3A.
An annular cutter 3e is disposed on the outer periphery of the center drill 3s, with the distal end retreated toward the base end side from the center drill 3s. In addition, the annular cutter 3e forming a part of the drill body 3B integrally with the center drill 3s.
Is configured to be attachable to the shank portion 3A in a one-touch manner.

Thus, the present dustproof cover configured as described above operates as follows in the work of piercing concrete or the like. That is, first, prior to the operation, the first contact surface 2k of the core body 2B is brought into contact with the contact surface 3a on the shank portion 3A having the drill body 3B integrally attached to the tip thereof. Then, the core body 2B is attached (set) from the base end side. At this time, it is attached so that the locking wall 2n of the core body 2B is securely locked to the locking wall 3c of the shank portion 3A. Thereby, the core body 2B can rotate integrally with the shank portion 3A. Next, in this core body 2B,
From the base end, the base 2A of the flange member 2 is attached (set) so that the lip 2c of the base 2A is inserted into the ring-shaped groove 2b of the core body 2B. In this state, the core body 2
The base portion 2A comes into sliding contact with B through the oilless metal portion of the lip portion 2c. Next, when the flange member 2 is set on the shank portion 3A, the locking groove 3 is located at the upper end position of the flange member 2 of the shank portion 3A.
b is exposed to the outside.
By locking the locking ring 4 to the shank portion 3
A flange member 2 is fixed to A. In this embodiment, when the locking ring 4 is locked, a flat washer 8 is attached to the base 2A. Then, in this state, the bellows body 1 is inserted into the shank portion 3A from the distal end such that the fitting portion 1a is located on the base end side. Then, the protrusion 1j of the fitting portion 1a is locked in the locking groove 2j of the base 2A of the flange member 2 by an insertion operation and a rotation operation in the axial direction, and the bellows 1
Is fixed to the collar member 2. When the dustproof cover is attached to the drill side in this way, as shown in FIG.
Is in a state protruding to the tip side from the center drill 3s on the drill side.

In this state, the suction port 2h is
The proximal end connects the distal end of a connecting tube, for example a suction hose, connected to a suction device (not shown).

In this state, when a drilling operation is performed, a center hole is first drilled by a center drill 3s. At this time, the dustproof cover is in a state where the periphery of the drill body 3B is sealed. In addition, since the inside of the dust-proof cover is at a negative pressure by the suction device, all dust generated by drilling is sucked from the suction port 2h to the suction device side. Similarly,
As shown in FIG. 5, drilling proceeds and the annular cutter 3e
When the drilling is performed, all dust generated by the drilling is sucked from the suction port 2h to the suction device side, as in the case of drilling with the center drill 3s. And in the process of drilling, drilling proceeds,
As shown in FIG. 5, as the annular cutter 3 e gradually penetrates the perforated surface, the bellows body 1 shrinks and the space in the dustproof cover narrows accordingly. ,
Since the inside is always at a negative pressure due to the suction of the suction device, all the dust in the dustproof cover is suctioned to the suction device side via the suction port 2h (see arrow X in FIG. 1).

Therefore, the surrounding area where the drilling operation is being performed is not contaminated with dust generated by the drilling.

Moreover, during the drilling operation, there is a gap between the opening of the tip 1B of the bellows body 1 and the drilling surface of concrete or the like, so that the outside air side and the inside of the dustproof cover communicate. However, as described above, the inside of the dust-proof cover has a negative pressure due to suction, so that only outside air enters into the bellows body, and no dust goes out.

Further, the flange member 2 is also provided during the drilling operation.
In, the base 2A is fixed, and only the core body 2B rotates together with the drill side. Since the space between the base 2A and the core body 2B is made of a material having high wear resistance as described above, it does not wear even when used for a long time. Further, as described above, since the low friction material is used for the sliding contact portion, the rotating side can rotate smoothly.

The dustproof cover is also provided with a rubber stopper 7 at the suction port 2h as shown in FIG. 4 so that the dustproof cover can be used without a suction device. It can be used like a cover.

[0032]

According to the dustproof cover according to the present invention, even if a gap is formed between the dustproof cover and a surface such as a wall to be drilled, or as the drilling operation progresses, the inside of the dustproof cover is removed. Even if the space is reduced, dust in the dustproof cover does not scatter outside. Further, according to the dustproof cover according to the present invention, since the inside of the dustproof cover becomes negative pressure, even when drilling work on the ceiling surface with an electric drill,
Since the electric drill is suspended or close to the electric drill by the dustproof cover, the physical burden conventionally imposed on the operator for holding the electric drill is eliminated or the physical burden is reduced. . Further, by covering the suction port with a lid such as a rubber stopper, the suction port can be used similarly to a conventional dustproof cover.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing the entire structure of a dustproof cover according to the present embodiment and showing an internal structure.

FIG. 2 is an enlarged cross-sectional view showing a configuration of a flange member of the dustproof cover shown in FIG.

FIG. 3 is a plan view showing a plane configuration of a flange member shown in FIG. 1 or FIG. 2;

FIG. 4 is a side sectional view showing a state before drilling work, in which the dust cover shown in FIGS. 1 to 3 is attached to a drill side.

FIG. 5 is an immediate sectional view showing a state in which the bellows body has been contracted by the drilling operation from the state shown in FIG. 4;

[Explanation of symbols]

 1 ... bellows body 1A ... base end 1B ... tip 2 ... flange member 2F ... through hole 2h ... suction port

Claims (5)

[Claims] 1. A bellows body which is stretchably arranged to cover the periphery of the drill from a drill tip to a base end, and has a bellows body having a tip end and a base end opened. In a dustproof cover including a flange member provided with a through hole for insertion, a suction port having a base end connected to a suction device via a connection pipe is provided in the flange member, and the suction port is a bellows A dustproof cover that is in communication with the inside of the body. 2. A first flange member having a distal end abutting from a proximal end thereof to a flange portion provided at a proximal end portion of a drill at a distal end thereof.
And a second contact surface at the base end of the flange member, the second contact surface protruding from the flange member toward the base end in a set state. The dustproof cover according to claim 1, wherein the dustproof cover comes into contact with a locking ring fitted in a locking groove provided around the side portion. 3. The flange member has a core body that rotates integrally with a drill side, and a base that slides on the core body.
The dustproof cover according to claim 1, wherein the suction port is formed in the base. 4. A ring-shaped groove is formed on one of a base end face of the core body and a tip of the base, and a ring-shaped lip is formed on the other, which is inserted into the ring-shaped groove. 4. The method according to claim 3, wherein one of the lip portion and the portion in contact with the lip portion is a metal, and the other is a bearing member that rotatably holds the metal in a low friction state. Dustproof cover. 5. The outer periphery of the core body is configured to be smaller than the opening at the base end of the bellows body, so that the distal end surface of the base is exposed to the bellows body side. The dustproof cover according to claim 3 or 4, wherein a tip of the mouth is open.