JPS6241044Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a concrete cutting bit used for cutting a concrete surface such as a paved road surface or an asphalt surface into a circular shape.

Traditionally, we have installed road facilities, collected soil samples,
Alternatively, for engraving patterns on road surfaces, a method has been adopted in which a cylindrical bit with a cutting edge at the lower end of the cylinder is rotated around its central axis and fed in the direction of the cutting edge to cut the paved road surface into a circular shape. . When cutting concrete or asphalt surfaces using such a cylindrical bit, it is generally necessary to supply water, that is, cutting water, to the cutting area for cooling, lubrication, or cleaning of cutting waste. In general, cutting water is supplied into the center of the cylindrical bit through a hollow rotating shaft, and flows from the center of the road surface to be cut to the surrounding cutting location. However, this type of cutting water supply structure does not pose any particular problem when the diameter of the cylindrical bit is relatively small, but this is not particularly problematic when the diameter of the cylindrical bit is relatively small. When this becomes large, the influence of uneven supply water amount due to direction at the cutting water supply port and the influence of the slope and unevenness of the road surface to be cut becomes noticeable, resulting in a situation where cutting water is not uniformly and sufficiently supplied all around the cutting area. There were problems such as.

The concrete cutting bit according to the present invention effectively supplies cutting water to the entire circumference of the cutting area by using the centrifugal force generated by the rotation of the cylindrical bit.
A cylindrical bit that has a cutting edge at the lower end of the cylinder and cuts a workpiece in a circular shape by rotating around the center axis and feeding in the direction of the cutting edge. It is characterized by having a communication hole that forms a water receptacle and introduces the cutting water into the inside of the cylindrical portion.

To explain the present invention based on the drawings, Fig. 1 is a sectional view of an embodiment of the present invention, in which a cylindrical bit 1 has a cylindrical part 2, a cutting edge 3, a donut plate-shaped upper plate part 4, and an upper plate part. The upper plate part 4 is composed of a removable weir 6 that forms a horizontal U-shaped cutting water receiver 5 together with the upper plate part 4, and a plurality of communication holes 7 are bored in the periphery of the upper plate part 4.
The cylindrical bit 1 is connected to a rotating shaft 8, rotated by a motor 9, and sent by an elevating mechanism (not shown) to cut a paved road surface 10 into a circular shape. Further, cutting water is supplied from the cutting water supply pipe 11 to the upper plate portion 4 of the rotating cylindrical bit 1, but this flows toward the circumference due to centrifugal force and is received by the cutting water receiver 5. At the same time, it flows down from the communication hole 7 into the inside of the cylindrical part 2, and is effectively supplied to the cutting location along or not along the inner wall of the cylindrical part 2.

FIG. 2 is a cross-sectional view of another embodiment of the present invention;
The basic structure and effects of the cylindrical bit 1a are the same as those of the cylindrical bit 1 described above, but the weir 6a in this case is a horizontal V-shaped cutting water receiver 5 together with the upper plate 4.
The cylindrical bit 1a is pivotally attached via a sleeve 12 to a shaft 14 vertically installed in the center of a manhole cover 13 so as to be able to rotate and move up and down. The sleeve 12 is driven by a motor 9a via a driven gear 15 and a driving gear 16 meshed with the driven gear 15.
The cylindrical bit 1a is rotated by the shaft 14 and fed along the shaft 14 by a lifting mechanism (not shown) together with the sleeve 12, driven gear 15, driving gear 16 and motor 9a, thereby cutting the paved road surface 10 around the manhole cover 13 into a circular shape.

In the present invention, there are no restrictions on the shape or structure of the cutting water receiver, and it does not matter whether it is closed or open. Further, the cutting water receiver can be formed independently of the upper plate part, instead of using the upper plate part of the cylindrical bit and providing a weir thereon as in the above embodiment. Furthermore, in addition to providing an independent cutting water supply pipe as in the above embodiment, the cutting water may be supplied from a hollow part formed by using the rotary shaft or shaft in the above embodiment, for example. Good too.

As described above, according to the concrete cutting bit according to the present invention, it is possible to effectively supply cutting water to the cutting location, and the effect becomes particularly pronounced as the diameter of the cylindrical bit increases. .

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of an embodiment of the present invention. 1, 1a... Cylindrical bit, 2... Cylindrical part, 3
... Cutting edge, 4 ... Upper plate part, 5, 5a ... Cutting water receiver, 6, 6a ... Weir, 7 ... Communication hole, 10 ... Paved road surface, 11 ... Cutting water supply pipe.

Claims (1)

[Scope of utility model registration request] A cylindrical bit that has a cutting edge at the lower end of the cylinder and rotates around the center axis and feeds in the direction of the cutting edge to cut the workpiece in a circular shape. A concrete cutting bit characterized by forming a water receptacle and having a communication hole for introducing the cutting water into the inside of the cylindrical part.