JP7049873B2 - Dust collection bit and rotary striking tool - Google Patents

Description

The present invention relates to a dust suction bit used when forming a pilot hole for driving an anchor bolt using an electric tool, and a rotary striking tool such as a hammer drill equipped with the dust suction bit.

When driving an anchor bolt using an electric tool, after forming a pilot hole at the driving position with a drill bit attached to an electric drill or the like, insert a punch (holder for anchor driving) into the electric hammer or the like. It is a procedure to install and hit the anchor bolt to drive. In this case, it takes time and effort to replace the drill bit with the punch, and the work efficiency deteriorates. Therefore, in Patent Document 1, a tubular portion capable of accommodating the drill bit from the tip is formed in the punch, and the drill bit is lowered in the drill mode. Disclosed is an invention of an anchor attachment that enables a drill bit to be mounted after the hole is formed by covering the mounted drill bit with a punch so that the drill bit can be driven as it is in the hammer mode.

Jitsukaisho 62-22803 Gazette

However, in the actual driving work, when the pilot hole is formed, the dust generated during drilling remains in the pilot hole and cannot be driven as it is, so the work is temporarily interrupted and accumulated in the pilot hole using a dust collector or the like. Dust needs to be removed. Therefore, even in the invention of Patent Document 1 in which the drill bit is covered with a punch, it is necessary to clean the prepared hole, and there is a limit to the improvement of the work efficiency.

Therefore, it is an object of the present invention to provide a dust collecting bit and a rotary striking tool capable of efficiently performing the driving work of anchor bolts including cleaning of pilot holes.

In order to achieve the above object, the invention according to claim 1 is a dust suction bit that is provided with a blade at the tip and has a dust suction path having a suction port on the outer surface thereof and can be attached to an electric tool. ,
While it has a mounting part to which a holder for driving anchors can be mounted,
A butt portion for setting a fixed dimension depth is provided behind the blade portion, and the butt portion is characterized in that it is also used as a mounting portion for an anchor driving holder .
According to a second aspect of the present invention, in the configuration of the first aspect, the anchor driving holder has a rod portion at the front end and a tubular portion coaxially formed behind the rod portion, and the tubular portion is thrust. It is characterized by having a small diameter portion on the front side capable of accommodating the blade portion in the mounted state and a large diameter portion on the rear side in which the abutting portion can be fitted in the mounted state .
According to a third aspect of the present invention, in the configuration of the first or second aspect, a guide groove formed from the front end to the rear on the peripheral surface of the abutting portion and a guide groove communicating with the rear end of the guide groove in the circumferential direction. A retaining groove composed of a locking groove is formed, and the bottom surface of the guide groove has an inclination that gradually becomes shallower from the front end to the rear end, and the bottom surface of the guide groove and the guide groove are formed. The deepest valley is formed in the communication part of the anchor, and the anchor driving holder enters the retaining groove from the guide groove when it is attached to the abutting part and engages with the valley of the locking groove. It is characterized by being provided with a lock body that can be stopped .
The invention according to claim 4 is characterized in that, in any of the configurations of claims 1 to 3 , the suction port is formed on the front end surface of the blade portion.
The invention according to claim 5 is provided with a dust collecting adapter attachment portion to which an external dust collecting hose can be connected at a position communicating with the dust collecting path in the configuration according to any one of claims 1 to 4 . It is characterized by that.
In order to achieve the above object, the invention according to claim 6 is a rotary hammering tool, which is equipped with the dust collecting bit according to any one of claims 1 to 5 , and has a drill mode for rotating the dust collecting bit. Alternatively, it is characterized in that a hammer drill mode and a hammer mode for striking a dust suction bit can be selected.

According to the inventions of claims 1 and 6 , since the dust suction bit can be equipped with the anchor driving holder, the dust can be sucked at the same time as the pilot hole is formed by the dust suction bit, and the anchor driving holder can be directly attached to the dust suction bit. Once installed, it will be possible to continue driving anchor bolts. Therefore, it is possible to efficiently perform the work of driving the anchor bolts, including cleaning the pilot holes.
In particular , since the abutting portion for setting the fixed size depth is also used as the mounting portion of the anchor driving holder, the mounting portion of the anchor driving holder can be easily obtained, which is a rational configuration.
According to the fourth aspect of the present invention, in addition to the above effect, since the suction port is formed on the front end surface of the blade portion, dust can be efficiently collected when the pilot hole is formed.
According to the fifth aspect of the present invention, in addition to the above effect, a dust collecting adapter mounting portion capable of connecting an external dust collecting hose at a position communicating with the dust collecting path is provided, so that the dust collecting bit is provided. It is possible to collect dust in a dust collector or the like without scattering the dust sucked in.

It is a perspective view of a dust suction bit (with a holder for driving an anchor). It is a perspective view of the dust suction bit and the holder for driving an anchor. (A) is a horizontal sectional view of a dust suction bit (with an anchor driving holder), and (B) is a central vertical sectional view. It is a side view of a hammer drill equipped with a dust suction bit. It is a central vertical sectional view of a hammer drill equipped with a dust suction bit (with a holder for driving an anchor).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a dust suction bit 1 with an anchor driving holder 30, and FIG. 2 is a perspective view of both. Here, for convenience, the anchor driving holder 30 side will be described as the front, the dust suction bit 1 side as the rear, and the dust collecting adapter 3 as the protruding side as the bottom.
The dust collecting bit 1 includes a metal bit body 2 and a resin dust collecting adapter 3 mounted on the bit body 2. The bit body 2 has a shaft-shaped blade portion 4 having a cutting edge 5 at the front end, a butt portion 7 having a larger diameter than the blade portion 4 formed coaxially to the rear of the blade portion 4, and a butt portion. It is composed of a shank portion 8 having a diameter smaller than that of the abutting portion 7 formed coaxially to the rear of the 7. The dust collecting adapter 3 is mounted orthogonally to the abutting portion 7.

The blade portion 4 is formed so that the length from the tip of the cutting edge 5 to the front end surface of the abutting portion 7 is a fixed size of the pilot hole depth of the anchor bolt, and the blade portion 4 and the abutting portion 7 are formed. As shown in FIG. 3, a dust suction path 9 is formed at the center of the axis so as to straddle both of them. The front end of the dust suction path 9 in the blade portion 4 is bifurcated and extends forward, and a pair of suction ports 10 and 10 are opened in the front end surface of the blade portion 4. The rear end of the dust suction path 9 is bent downward in the abutting portion 7 and extends downward, and the outlet 11 is opened on the lower surface of the abutting portion 7.
The abutting portion 7 has a front flange 12 and a rear flange 13 for positioning the front and rear end faces of the dust collecting adapter 3 on the outer periphery near both front and rear ends, and is mounted on the outer peripheral surface in front of the front flange 12. An escape including a guide groove 15 formed from the front end to the rear and a locking groove 16 formed in the circumferential direction in communication with the rear end of the guide groove 15 in order to prevent the anchor driving holder 30 from coming off. A stop groove 14 is formed. Of these, the bottom surface of the guide groove 15 is inclined so as to gradually become shallower from the front end to the rear end, and on the bottom surface of the locking groove 16, the valley portion 17 which is the deepest in the communication portion with the guide groove 15 is formed. It is formed.

At the rear end of the shank portion 8, a pair of left and right retaining recesses 18 and 18 for inserting and mounting into the tool holder 59 of the hammer drill 50 described later, and a pair of upper and lower detent grooves 19 and 19, respectively, are formed. ing.
The dust collecting adapter 3 has a tubular outer portion 20 that is externally rotatable relative to the abutting portion 7 between the front flange 12 and the rear flange 13, and a tubular outer portion 20 that is connected to the outer portion 20 and projects downward. It is composed of a tubular portion 21 having an open lower surface. The lower surface of the exterior portion 20 is opened to communicate with the tubular portion 21, and the outlet 11 of the abutting portion 7 is opened in the tubular portion 21.

The anchor driving holder 30 has a rod portion 31 positioned at the end of the anchor bolt and a tubular portion 32 coaxially formed behind the rod portion 31 at the front end. The tubular portion 32 has an inner diameter slightly larger than that of the blade portion 4 of the dust absorbing bit 1 and is formed to be slightly longer than the total length of the blade portion 4. The inner diameter is a two-step diameter consisting of a large diameter portion 34 on the rear side formed by the length from the front end surface of the abutting portion 7 to the front end surface of the front flange 12. A stepped portion 35 that abuts on the front end surface of the abutting portion 7 is provided on the inner circumference of the tubular portion 32.
Further, a pair of through holes 36, 36 are formed through the upper and lower through holes 36, 36 in the intermediate portion in the front-rear direction in the small diameter portion 33, and the retaining groove 14 is formed in the large diameter portion 34 in the fitted state of the abutting portion 7. A through hole 37 corresponding to the position of the locking groove 16 and a ring-shaped groove 38 communicating with the through hole 37 are formed. In the through hole 37, a lock body 39 that can be engaged with the retaining groove 14 is accommodated so as to be able to appear and disappear on the inner surface side, and is urged to a protruding position by a spring ring 40 exteriorized in the groove 38.

In the anchor driving holder 30, the phase of the lock body 39 is aligned with the guide groove 15 of the retaining groove 14 of the bit body 2, and the cylinder portion 32 is placed on the bit body 2 from the front. Then, the lock body 39 reaches the valley portion 17 of the locking groove 16 from the guide groove 15, and the blade portion 4 of the bit body 2 enters the small diameter portion 33 of the tubular portion 32, and the abutting portion 7 abuts on the large diameter portion 34. Is fitted, and the step portion 35 is positioned in the front-rear direction at a position where the step portion 35 abuts on the front end surface of the abutting portion 7 and the rear end of the large-diameter portion 34 abuts on the front flange 12. In this state, the lock body 39 located in the deep valley portion 17 is locked in the locking groove 16 to restrict the forward movement, so that the anchor driving holder 30 is prevented from coming off. When removing the anchor driving holder 30, when the anchor driving holder 30 is rotated so that the lock body 39 moves from the valley portion 17 to the end of the shallow bottom of the locking groove 16, the anchor body 39 is moved to the front of the lock body 39. Since it is allowed to move, it can be removed by pulling the anchor driving holder 30 forward as it is.

FIG. 4 shows a side surface of a hammer drill 50, which is an example of a rotary striking tool, equipped with a dust suction bit 1 in a state where the anchor driving holder 30 is not covered, and FIG. 5 shows a side surface in which the anchor driving holder 30 is covered. The central vertical cross section to which the dust suction bit 1 of the state is attached is shown.

The hammer drill 50 houses a motor (brushless motor) 52 in a lower front side of a housing 51 in which a pair of left and right half-split housings are assembled, with the output shaft 53 facing upward. An intermediate shaft 55 to which torque is transmitted via the bevel gears 54 and 54 is supported in the front-rear direction above the motor 52, and the intermediate shaft 55 is provided with a first gear 56, a clutch 57, and a boss sleeve 58 from the front. ing. Above the intermediate shaft 55, a tool holder 59 into which a bit can be inserted into the tip is pivotally supported in parallel with the intermediate shaft 55, and at the rear end of the piston cylinder 60 loosely inserted behind the tool holder 59, a boss sleeve 58 is used. An external arm 62 is connected via a swash bearing 61. Inside the piston cylinder 60, a striker 64 is externally movable back and forth via an air chamber 63 so that an impact bolt 65 provided in front of the striker cylinder 60 can be hit. The first gear 56 meshes with the second gear 66 mounted on the tool holder 59. The front end of the tool holder 59 projects forward from the housing 51, and the bit can be attached and detached by the operation sleeve 67 externally attached to the front end.

On the other hand, a handle 68 provided with a switch 69 and a switch lever 70 is formed on the upper rear side of the housing 51, and a battery mounting a battery pack 72 as a power source is slidly mounted below the handle 68. A section 71 is provided. A terminal block 73 that is electrically connected to the mounted battery pack 72 is provided in the battery mounting portion 71.
Further, on the front side of the housing 51 and on the lower side of the motor 52, a controller 74 electrically connected to the motor 52, a switch 69, a terminal block 73, etc. Contained in the direction.

Further, a switching knob 75 for switching the operation mode is provided on the side surface of the housing 51, and a side handle 76 is attached to the front end of the housing 51 in front of the switching knob 75. Here, by operating the switching knob 75, the clutch 57 is slid, and the forward position that engages only with the first gear 56, the backward position that engages only with the boss sleeve 58, and at the same time as the first gear 56 and the boss sleeve 58. By selecting one of the intermediate positions to be engaged, the tool holder 59 rotates via the second gear 66 to rotate the bit, and the piston cylinder 60 is reciprocated and interlocked by the swing of the arm 62. The striker 64 makes it possible to select a hammer mode in which the bit is hit through the impact bolt 65 and a hammer drill mode in which the rotation of the tool holder 59 and the hitting of the impact bolt 65 are performed at the same time.

In the dust suction bit 1 and the hammer drill 50 configured as described above, when the anchor bolt is driven, as shown in FIG. 4, the shank portion of the dust suction bit 1 is not attached with the anchor driving holder 30. 8 is inserted from the front end of the tool holder 59 and attached by the operation sleeve 67. Further, a flexible hose 22 as a dust collecting hose connected to the dust collector is connected to the tubular portion 21 of the dust collecting adapter 3.
Then, with the hammer drill mode (or drill mode) selected, the tip of the blade portion 4 is set at the anchor bolt driving position on the floor, ceiling, or the like, and the switch lever 70 of the hammer drill 50 is pushed in. Then, the switch 69 is turned on, the motor 52 is driven, the intermediate shaft 55 is rotated, and the tool holder 59 is rotated, so that the bit body 2 is rotated and drilling by the blade portion 4 is possible. If this drilling is performed until the abutting portion 7 abuts on the driving surface, a pilot hole having a fixed depth is formed.

When the dust collector is operated during the drilling work, the generated dust is sucked together with the outside air from the suction ports 10 and 10 on the front end surface of the blade portion 4, and as it is, it passes through the dust suction hose 9 and is cylindrical from the outlet 11 to the dust collection adapter 3. It reaches the section 21 and collects dust from the flexible hose 22 to the dust collector. Therefore, the drilling work is completed without leaving dust in the formed pilot hole.
Next, while inserting the anchor bolts into the prepared holes, as shown in FIG. 5, the anchor driving holder 30 is attached to the dust suction bit 1 and the hammer mode is selected. Then, the rod portion 31 is positioned at the end of the anchor bolt, and the switch lever 70 of the hammer drill 50 is pushed in to operate. Then, the motor 52 is driven to rotate the intermediate shaft 55, the arm 62 swings, the shank portion 8 is hit by the striker 64 via the impact bolt 65, and the anchor bolt is driven into the prepared hole. At the time of this driving operation, the flexible hose 22 may be removed from the tubular portion 21 of the dust collecting adapter 3.

As described above, according to the dust suction bit 1 and the hammer drill 50 of the above-described embodiment, the dust suction bit 1 is provided with a mounting portion (butting portion 7) to which the anchor driving holder 30 can be mounted, so that the dust suction bit 1 can be used to lower the dust suction bit 1. Dust can be sucked at the same time as the hole is formed, and if the anchor driving holder 30 is attached to the dust sucking bit 1 as it is, the anchor bolt can be continuously driven. Therefore, it is possible to efficiently perform the work of driving the anchor bolts, including cleaning the pilot holes.
In particular, here, an abutting portion 7 for setting a fixed dimension depth is provided behind the blade portion 4, and the abutting portion 7 is also used as a mounting portion for the anchor driving holder 30, so that the anchor driving holder 30 is used. It is a rational configuration that can easily obtain the mounting part of.

Further, since the suction port 10 is formed on the front end surface of the blade portion 4, dust can be efficiently sucked when the pilot hole is formed.
Further, since a mounting portion (butting portion 7 between the front flange 12 and the rear flange 13) of the dust collecting adapter 3 to which an external flexible hose 22 can be connected at a position communicating with the dust suction path 9 is provided. The dust collected by the dust suction bit 1 can be collected in a dust collector or the like without scattering the dust.
Then, according to the hammer drill 50 in which the dust suction bit 1 is attached and the hammer drill mode (or drill mode) and the hammer mode can be selected, the process from the formation of the pilot hole to the driving of the anchor bolt can be performed with one tool. Can be done.

In the above embodiment, the abutting portion for setting the fixed dimension depth is also used as the mounting portion of the anchor driving holder, but if there is no abutting portion, the mounting portion may be formed independently or the thrusting portion may be formed. A mounting portion may be formed separately from the contact portion. The length and shape of the blade and shank can be changed as appropriate.
Further, the structure of the dust suction path is not limited to the above-mentioned form, and the suction port may be one or may be formed other than the front end surface of the blade portion.
Furthermore, the dust collection adapter is not limited to the one made entirely of resin, but a metal coupler for connecting a dust collection hose may be provided on the resin exterior part that covers the bit body, or for dust collection. It does not matter if the adapter is removable from the bit body.

In addition, the form of the hammer drill can be changed as appropriate, such as the direction and type of the motor and the arrangement of the battery pack. It may be an AC machine equipped with a power cord instead of a battery pack.
Further, the hammer drill may be provided with a C-shaped holder portion or a storage portion such as a pocket on the outer surface of the housing so that the holder for driving the anchor can be held or stored.
Furthermore, the work of driving anchor bolts is not limited to using only a rotary striking tool such as a hammer drill. For example, pilot holes are formed by attaching a dust suction bit to an electric drill, and anchor bolts are driven into an electric hammer. It can also be used by attaching a dust suction bit with a holder. In this case as well, the dust suction bit enables dust to be sucked at the same time as the pilot hole is formed.

1 ... Dust suction bit, 2 ... Bit body, 3 ... Dust collection adapter, 4 ... Blade part, 7 ... Butt part, 8 ... Shank part, 9 ... Dust suction hose, 10 ... Suction port , 12 ... Front flange, 13 ... Rear flange, 14 ... Retaining groove, 20 ... Exterior part, 21 ... Cylindrical part, 22 ... Flexible hose, 30 ... Holder for hammering anchor, 31 ... Rod part, 32 ... Cylinder part, 33 ... Small diameter part, 34 ... Large diameter part, 35 ... Step part, 50 ... Hammer drill, 51 ... Housing, 52 ... Motor, 53 ... Output shaft, 55 ... Intermediate shaft, 59 ... Tool holder, 67 ... Operation sleeve.

Claims (6)

It is a dust suction bit that can be attached to a power tool by forming a dust suction path inside with a blade at the tip and a suction port on the outer surface.
While it has a mounting part to which a holder for driving anchors can be mounted,
A dust-absorbing bit characterized in that a butt portion for setting a fixed dimension depth is provided behind the blade portion, and the butt portion is also used as a mounting portion of the anchor driving holder . The anchor driving holder has a rod portion at the front end and a tubular portion coaxially formed behind the rod portion, and the tubular portion accommodates the blade portion in a state of being mounted on the abutting portion. The dust suction bit according to claim 1, further comprising a possible front small diameter portion and a rear large diameter portion to which the abutting portion can be fitted in the mounted state. On the peripheral surface of the abutting portion, a retaining groove including a guide groove formed from the front end to the rear and a locking groove formed in the circumferential direction communicating with the rear end of the guide groove is formed. At the same time, the bottom surface of the guide groove has an inclination that gradually becomes shallower from the front end to the rear end, and the deepest valley portion is formed in the communication portion with the guide groove on the bottom surface of the locking groove. Being done
The anchor driving holder is provided with a lock body that can enter the retaining groove from the guide groove and lock in the valley portion of the locking groove when the anchor is mounted on the abutting portion. The dust collecting bit according to claim 1 or 2, wherein the dust collecting bit is characterized in that. The dust suction bit according to any one of claims 1 to 3 , wherein the suction port is formed on the front end surface of the blade portion. The dust collecting bit according to any one of claims 1 to 4 , wherein a mounting portion of a dust collecting adapter to which an external dust collecting hose can be connected is provided at a position communicating with the dust collecting path. A rotary striking tool equipped with the dust-absorbing bit according to any one of claims 1 to 5 , wherein a drill mode or a hammer drill mode for rotating the dust-absorbing bit and a hammer mode for striking the dust-absorbing bit can be selected.

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