JPH0941319A - Blade of road surface cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the removal of chips definitely by forming a wide recessed area at the tip of a chunk from the peripheral edge toward the center side of the chunk and fitting a chip, which is wider on the base end than that on the tip side, into the recessed area from the thickness direction of the recessed area and soldering the chip. SOLUTION: An inversely tapered recessed area 6 is formed at the tip of a chunk 4. An inversely tapered chip 5 is fixedly soldered with the recessed area 6, thereby fixing the chunk 4 with the outer peripheral surface of a rotary drum. Therefore, the chip 5 is prohibited from coming off from the recessed area 6. This construction makes it possible to prevent the slip of the chip definitely and enhance the safety of work as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade of a road surface cutting device used when cutting a road surface such as a paved road for re-paving or burying a gas pipe.

[0002]

2. Description of the Related Art A cutter bit is used as a blade of a conventional road surface cutting device, and this cutter bit is disclosed in, for example, Japanese Utility Model Publication No. 62-1282. This cutter bit joins a chip having a concave back surface along a projecting cutting surface on the front surface of the chip to a chip seat surface of a shank having a projecting surface in close contact therewith. And
The shank to which this tip is joined is fixed to the cylindrical surface of the cutter drum with screws.

[0003]

However, this cutter bit has a problem in that the tip easily falls off from the tip seat surface of the shank during use, and the safety of cutting work is poor. That is, since the tip seat surface of the tip and the shank are simply concave and convex joints, for example,
If excessive force is applied to the tip during use, the tip will easily fall off the shank seat surface if the joint strength is insufficient.

As a result, the chips may be scattered during the work and hit the worker, resulting in poor work safety. In particular, in recent years, PL (product liability) has been severely questioned, and it cannot be said that the blade made of the above-mentioned cutter bit is sufficient from the viewpoint of this PL measure, and in reality, improvement is desired. Is.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a blade for a road surface cutting device, which can surely prevent chips from falling off and improve work safety. To provide the body.

[0006]

In order to achieve the above object, a blade body of a road surface cutting device according to claim 1 has a plurality of shanks each having a tip fixed to an outer peripheral surface of a cylindrical rotary drum. In a blade body of a road surface cutting device that permanently fixes and cuts a road surface by rotation of a chip by rotation of a rotating drum, a wide concave portion is formed at a tip portion of a shank from a peripheral side toward a center side, and It is characterized in that a chip whose end side is wider than the tip side is fitted and brazed from the plate thickness direction of the recess.

Further, in the blade body of the road surface cutting device according to claim 2, a tip is fixed to an outer peripheral tip end portion of the rotary disk, and the blade body of the road surface cutting device cuts the road surface by the rotation of the rotary disk. Forming a wide concave portion from the peripheral side toward the center side at the tip of the turntable, and brazing by inserting a chip whose base end side is wider than the tip side into the concave portion from the plate thickness direction of the concave portion. Is characterized by.

Further, the blade body of the road surface cutting device according to claim 3 is characterized in that the recess and the tip are formed in a substantially triangular shape.

[0009]

According to the blade of the road surface cutting device of the first aspect, an inversely tapered recess is formed at the tip of the shank, the inversely tapered tip is brazed and fixed in the recess, and the shank is rotated. Fix it on the outer surface of the drum. As a result, the chip is prevented from coming off from the recess, and the chip does not easily drop even when the brazing strength is poor, for example.

Further, according to the blade of the road surface cutting device of the second aspect, the tip formed in a reverse taper shape is fitted into the reverse taper concave portion formed in the outer peripheral tip portion of the rotating disk. , Braze and fix. The chip is prevented from coming off from the recess toward the outer peripheral side, and is prevented from falling off.

According to the blade body of the road surface cutting device of the third aspect, by forming the tip in a substantially triangular shape,
For example, the chip can be attached even when it is turned upside down.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a blade of a road surface cutting device according to the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a side view of a cutter bit, and FIG. 3 is a plan view of FIG. In the figure, a blade 1 comprises a cylindrical rotary drum 2 and a cutter bit 3 fixed to the outer peripheral surface of the rotary drum in a predetermined form.
have.

As shown in FIGS. 2 and 3, the cutter bit 3 has a shank 4 formed of a casting having a substantially prismatic shape, a steel material or the like, and a tip portion 4a of the shank 4 has a diamond, a cemented carbide or the like. The chip 5 consisting of is fixed. The tip 5 is formed in a regular triangular prism shape, and the tip 5 is brazed and fixed to a substantially triangular recess 6 of the shank 4 having a narrow width at the tip opening side. The tip 5a of the tip 5 projects a predetermined length from the tip 4a of the shank 4 to form a cutting edge.

The cutter bit 3 is inserted into the recess 6 of the shank 4 from the thickness direction thereof (the direction of arrow A in FIG. 3).
With the chip 5 positioned in the recess 6, the chip 5 is placed in the recess 6 by bringing the joining portion into contact with a silver solder or the like while inductively heating it with a high-frequency induction heating device (not shown). Fixed by brazing.

Then, the cutter bit 3 is attached to the rotary drum 2
Bit mounting portion 7 provided on the outer peripheral surface of the (see FIG. 1)
Then, the blade body 1 is configured by, for example, fixing it with a screw (not shown). When the rotary shaft 8 of the blade 1 is attached to the road surface cutting device and the rotary drum 2 is rotated, the cutter bit 3 also rotates and the road surface is cut by the tip 5 at the tip of the shank 4.

At the time of this cutting, a considerable impact force is applied to the tip 5 due to the collision with the road surface, but the tip 5 is brazed and fixed to the recess 6 of the inverse taper shape, and the tip 5 is opened to the open end side. Since the movement is completely blocked, the tip 5 does not come out of the recess 6 and the road surface is cut well.

As described above, in the above-mentioned blade 1, since the tip 5 is fitted into the recess 6 having a narrow opening side and fixed by brazing, the tip 5 moves toward the opening. Is prohibited, and, for example, even if an excessive force acts on the tip portion 5a of the tip 5 during use, the tip 5 does not drop out from the recess 6.

Therefore, for example, even if there is a portion where the brazing strength of the tip 5 is weak, the tip 5 can be prevented from being dropped off without fail, and the blade 1 can be used for a long period of time, and the tip 5 can be dropped off. Scattering is prevented, and work safety during road surface cutting work is enhanced. As a result, it is possible to provide the blade body 1 that sufficiently functions as a PL measure and is highly safe. Further, since the tip 5 has a regular triangular cross section,
The shank 4 is set in the recess 6 with no directionality, the setting work can be performed very easily, and the tip 5 and the recess 6 can be easily manufactured, so that the cost of the blade 1 can be reduced.

The shapes of the tip 5 and the recess 6 in the above embodiment are merely examples, and may be configured as shown in FIG. 4 or FIG. 5, for example. That is, the cutter bit 10 shown in FIG. 4 is formed by forming the chip 11 into a right-angled triangular cross section, and the cutter bit 15 shown in FIG. 5 is formed by forming the surface of the chip 16 on the rotation direction side flat.
The whole shape of is formed in a substantially triangular shape in cross section. Even with this structure, the tips 11 and 16 are prevented from coming off from the recess 6 at the tip of the shank 4, and the same effect as the above-described embodiment can be obtained.

6 and 7 show another embodiment of the blade body of the road surface cutting device according to the present invention. FIG. 6 is a side view thereof, and FIG. 7 is an enlarged side view of a rotary disk. Blade 21 of this embodiment
Has a substantially square-shaped rotating plate 22.
Chips 23 are fixed to the four corners, respectively.
This chip 23 is formed in an equilateral triangle shape as in the above-mentioned embodiment, and this chip 23 is fitted into the substantially triangular recesses 24 provided at the four corners of the rotary disc 22 and fixed by brazing. ing.

The concave portion 24 of the turntable 22 is formed in a reverse taper shape with a narrow width on the opening side, and the chip 23 is prohibited from coming off to the opening side. Then, the chips 23 are fitted and brazed from the plate thickness direction of the turntable 22 in the same manner as in the above-mentioned embodiment, and a large number of the turntables 22 are laminated and fixed at different mounting angles. A blade body 21 as shown in FIG. 6 is configured.

Also in this blade 21, even if an excessive force acts on the tip of the tip 23 due to its rotation, the tip 2
3 is completely prevented from coming off to the opening side, so that it does not come off easily from the depression 24. The shape of the chip 23 in this embodiment is also an example, and the same chip as that in the above embodiment can be used.

In the above blades 1 and 21, the recesses 6 and 24 and the tips 5 and 23 are formed straight in the thickness direction of the shank 4 and the turntable 22, but the present invention is not limited to this. Instead of this, for example, the side surfaces of the recesses 6 and 24 and the side surfaces of the chips 5 and 23 may be tapered in the plate thickness direction.

In this way, the shank 4 or the turntable 22 is placed in a horizontal state, and the chips 5, 23 are recessed 6,
When set to 24, the chips 5 and 23 are recessed
The blades 1 and 21 in which the positions of the chips 5 and 23 in the plate thickness direction are automatically aligned and the brazing positions of the chips 5 and 23 are made uniform are obtained while not falling from the top.

Further, the substantially triangular shape according to the present invention includes, for example, one having a slight curve on one side or having an uneven shape as a whole and presenting a triangular shape as a whole. It goes without saying that various modifications can be made without departing from the scope.

[0026]

As described above in detail, according to the blade body of the road surface cutting device of the present invention, it is possible to reliably prevent the tip from falling out of the recess of the shank or the rotary disk, and to ensure the safety of work. It is possible to improve the effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a blade body of a road surface cutting device according to the present invention.

FIG. 2 is a side view of the same cutter bit.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view showing another example of the cutter bit.

FIG. 5 is a side view showing still another example of the cutter bit.

FIG. 6 is a side view showing another embodiment of the blade body of the road surface cutting device according to the present invention.

[Fig. 7] Enlarged side view of the turntable

[Explanation of symbols]

 1, 21 Blade 2 Rotating Drum 3 Cutter Bit 4 Shank 4a Tip 5,23 Chip 6,24 Recess 22 Rotating Disk

Claims (3)

[Claims] 1. A blade of a road surface cutting device for fixing a plurality of shanks having tips fixed to the outer peripheral surface of a cylindrical rotary drum, and cutting the road surface by rotation of the chips due to rotation of the rotary drum. Forming a wide recess at the tip of the shank from the peripheral side toward the center, and fitting a chip having a base end side wider than the front end into the recess in the plate thickness direction of the recess and brazing. A blade body for a road surface cutting device, which is characterized by: 2. A blade body of a road surface cutting device, wherein a tip is fixed to a tip portion of an outer periphery of a turntable, and a road surface is cut by rotation of the tip due to rotation of the turntable. A blade body of a road surface cutting device, characterized in that a recess having a wider width toward the side is formed, and a chip having a base end side wider than the front end side is fitted into the recess from the plate thickness direction of the recess and brazed. . 3. The blade body of the road surface cutting device according to claim 1, wherein the recess and the tip are formed in a substantially triangular shape.