JP2020133370A - Mounting structure of bench-cut cutter - Google Patents

Abstract

To provide mounting structure of a bench-cut cutter, in which the bench-cut cutter can be detachably mounted to an outer periphery of a circle cutter firmly and rapidly.SOLUTION: In mounting structure used in an installation method of a manhole frame and for mounting a bench-cut cutter 2 locating a cutter bit 22 on a large diameter circumference than the prescribed diameter to an outer periphery of a cylindrical body of a circle cutter 1 having the cylindrical body provided with a cutter bit 12 on an opening end surface of a prescribed diameter opening, the mounting structure comprises a fixture 3 provided with a base plate 31, a plurality of fitting bolts 33 erected on one surface of the base plate 31 and being inserted respectively into plural fitting holes 13 disposed on the peripheral surface of the cylindrical body, and a holding part 32 disposed on the other surface of the base plate 31. The bench-cut cutter 2 is mounted on the circle cutter 1 by nuts screwed at the fitting bolts 33.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mounting structure in which a step cutting cutter is attached to a circular cutting cutter used in a method for installing a manhole frame.

Patent Document 1 provides a circular cutting cutter having a cylindrical body having a cutter bit on the open end surface, and a step cutting cutter on the outer periphery of the cylindrical body in which a cutter bit is positioned on a circumference having a larger diameter. A cutter structure is shown in which concentric double grooves of different depths are cut and formed on the paved road surface around the manhole.

JP-A-2017-203329

By the way, when cutting a paved road surface with a cutter bit, a large load is also applied to the step cutting cutter, so it is necessary to firmly fix the step cutting cutter to the outer circumference of the circular cutting cutter. In this case, the step cutting cutter needs to be attached with removable bolts to enable replacement and height adjustment, but it needs to be attached with multiple bolts for strong fixing, while construction workability It was required to carry out this installation promptly in order to improve the performance.

Therefore, the present invention solves such a problem, and an object of the present invention is to provide a step-cutting cutter mounting structure that allows the step-cutting cutter to be attached to and detached from the outer circumference of the circular cutting cutter in a strong and fast manner. And.

In order to achieve the above object, in the first invention, the circular cutting cutter (1) having a cylindrical body provided with a cutter bit (12) on the opening end face of an opening having a predetermined diameter, which is used in a method for installing a manhole frame, is described above. It is a mounting structure for mounting a step cutting cutter (2) in which a cutter bit (22) is positioned on a circumference having a diameter larger than the predetermined diameter on the outer circumference of the cylindrical body, and is a mounting structure for mounting the substrate (31) and the said. A plurality of mounting bolts (33) erected on one surface of the substrate (31) and inserted into a plurality of mounting holes (13) provided on the peripheral surface of the cylindrical body, and the substrate (31). The step cutting cutter (2) has the mounting tool (3) provided with a grip portion (32) provided on the other surface, and the step cutting cutter (2) is the circular cutting cutter by a nut screwed into the mounting bolt (33). It is attached to (1).

In the first invention, a plurality of mounting bolts are quickly and surely installed on the peripheral surface of the circular cutting cutter by grasping the gripping portion of the mounting tool, and the step cutting cutter is firmly mounted on the peripheral surface of the circular cutting cutter. Can be mounted on a surface.

In the second invention, when the mounting bolt (33) is inserted into the mounting hole (31), the magnet body (34) that attracts the substrate (31) of the mounting tool (3) to the peripheral surface of the cylindrical body. ) Is provided.

In the second invention, since the mounting tool can be reliably positioned on the peripheral surface of the cylindrical body, the mounting bolt does not displace and the nut can be easily screwed.

In the third invention, both side edges of the step cutting cutter (2) are connected to the peripheral surface of the cylindrical body by mounting bolts (33) of the mounting tool (3), respectively, and the step cutting cutter (2) is used. Another mounting bolt (24) provided at the center thereof is connected to the peripheral surface of the cylindrical body.

According to the third invention, the step cutting cutter can be firmly and surely attached to the peripheral surface of the cylindrical body of the circular cutting cutter at the center and both side edges thereof.

In the fourth invention, a plurality of the mounting holes (13) are provided so that the mounting position of the step cutting cutter (2) can be changed in the vertical direction, and the plurality of mounting holes (13) are the step cutting. It is formed on the peripheral surface of the cylindrical body so that a part of the cutter (2) can be shared at different mounting positions.

According to the fourth invention, the mounting position of the step cutting cutter can be changed in the vertical direction, and the labor of forming a plurality of mounting holes that can be changed can be reduced.

The reference numerals in parentheses indicate the correspondence with the specific means described in the embodiments described later for reference.

As described above, according to the mounting structure of the step cutting cutter of the present invention, the step cutting cutter can be attached to and detached from the outer circumference of the circular cutting cutter, and can be firmly and quickly mounted.

It is the whole perspective view of the circular cutting cutter with the step cutting cutter attached. It is a front view and a side view of a step cutting cutter. It is a side view of the fixture. It is a front view of the fixture seen from the direction of the X arrow of FIG. It is the whole perspective view of the circular cutting cutter with the step cutting cutter removed. It is a side view of the circular cutting cutter with the step cutting cutter removed. It is a perspective view seen from the inside of a cylinder of a circular cutting cutter when a step cutting cutter is attached. It is a partially enlarged perspective view of the circular cutting cutter with the step cutting cutter attached. It is a perspective view which shows the state which formed the concentric double groove on the paved road surface by the circular cutting cutter with the step cutting cutter attached.

It should be noted that the embodiments described below are merely examples, and various design improvements made by those skilled in the art within the scope of the present invention are also included in the scope of the present invention.

FIG. 1 shows the appearance of a circular cutting cutter 1 provided with a step cutting cutter 2. The circular cutting cutter 1 is entirely cylindrical, and the opening edge 11 is left in a flange shape with a constant width at the upper opening thereof, and is connected to a plurality of locations in the circumferential direction of the opening edge 11 to be connected to the rotating device (not shown). The bolt 111 is projected. On the other hand, the cutter bit 12 is fixed to the entire circumference of the opening end surface of the lower opening of the circular cutting cutter 1. Then, the step cutting cutter 2 is attached to the outer periphery of the cylindrical body of the circular cutting cutter 1 at the upper and lower intermediate positions of three equidistant positions in the circumferential direction by the attachment structure described later.

2 (1) and 2 (2) show a front view and a side view of the step cutting cutter 2, respectively. The step cutting cutter 2 includes a plate-shaped main body 21 that is curved along the peripheral surface of the circular cutting cutter 1. The upper half portion 211 of the plate-shaped main body 21 is rectangular, and the lower half portion 212 is gradually narrowed downward. It is molded into a trapezoidal shape. A cutter bit 22 is provided along the lower end surface of the trapezoidal lower portion 212 of the lower half portion 212 of the step cutting cutter 2.

Behind the upper half 211 of the plate-shaped main body 21, a rectangular box-shaped base 23 curved along the plate-shaped main body 21 is connected by six bolts 213, and both side edges of the back surface of the base 23 protruding to the left and right. Notches 231 for inserting bolts are formed in the upper and lower positions, respectively. Further, a mounting bolt 24 is provided so as to project rearward at the center of the back surface of the base 23.

FIG. 3 shows a side view of the fixture 3 used when attaching the step cutting cutter 2 to the circular cutter 1, and FIG. 4 shows a front view of the fixture 3 as viewed from the direction of the X arrow in FIG. The fixture 3 includes a thick-walled vertically long substrate 31, and a plate material having a constant width bent in a U shape is erected between both ends thereof to serve as a grip portion 32 for an operator to grip. Mounting bolts 33 are fixed to both ends of the substrate 31 so as to project to the side opposite to the grip portion 32, and a columnar magnet body 34 projects from the center of the substrate 31. It is buried so as to be exposed on the side surface (Fig. 4).

As shown in FIG. 5, a large number of mounting holes 13 for mounting the step cutting cutter 2 are formed on the peripheral surface of the cylindrical body of the circular cutting cutter 1. Since the step cutting cutter 2 is mounted at three locations in the circumferential direction of the cylinder as described above, a group of mounting holes having the same arrangement is formed at three locations in the circumferential direction of the cylinder, and each mounting hole of the group of the mounting holes is formed. The arrangement of 13 is shown in FIG.

In FIG. 6, the mounting hole 13 for mounting the step cutting cutter 2 is provided in the center of the back surface of the base 23 of the step cutting cutter 2 as shown by the shaded portion in FIG. 6 as an example of the formation region of a set of mounting holes. Five mounting holes 13e for inserting the mounting bolts (see FIG. 2) and mounting holes 13a to 13d provided at positions corresponding to the notches 231 formed at the upper and lower positions of the back side edges of the base 23. A set of mounting holes is provided so that the mounting position can be changed in the vertical direction of the peripheral surface of the circular cutting cutter 1 by the dimension d, and a part of the mounting holes 13 can be shared by each adjacent set. In this way, the labor of forming the mounting hole 13 is reduced.

The mounting position of the step cutting cutter 2 can be changed in the vertical direction because the lower end of the cylinder is raised to a constant height each time in order to provide a new cutter bit as the cutter bit 12 of the circular cutting cutter 1 wears. It is excised at d. Therefore, the step cutting cutter 2 can be replaced upward by the dimension d according to this.

When attaching the step cutting cutter 2 to the peripheral surface of the circular cutting cutter 1, a pair of attachments 3 (see FIG. 3) are used, and each grip portion 32 is grasped from the inner peripheral surface side of the circular cutting cutter 1. The mounting bolts 33 at both ends of the board 31 of each mounting tool 3 are inserted into the mounting holes 13a, 13b and 13c, 13d (see FIG. 6) on both sides of the set of mounting holes, respectively. In this state, each attachment 3 is attracted and fixed to the inner peripheral surface of the circular cutting cutter 1 by the magnet body 34 at the center of the substrate 31 as shown in FIG.

With the mounting bolt 33 protruding outward from the mounting hole 13 on the peripheral surface of the circular cutting cutter 1, the mounting bolt 24 at the center of the back surface of the base 23 of the step cutting cutter 2 is inserted into the above set of mounting holes. It is inserted into the central mounting hole 13e, and at the same time, notches 231 above and below both side edges on the back surface of the base 23 are fitted into the protruding mounting bolts 33 (FIGS. 1 and 8). Subsequently, nuts are screwed into the mounting bolts 24 (FIG. 7) protruding from the inner peripheral surface of the circular cutting cutter 1 and the mounting bolts 33 protruding from the outer peripheral surface, respectively, and the stepped cutter 2 is rotated around the circular cutting cutter 1. Fix it in place on the surface.

According to such a mounting structure, a plurality of mounting bolts 33 can be quickly and surely installed on the peripheral surface of the circular cutting cutter 1 by grasping the grip portion 32 of the mounting tool 3, and the base of the step cutting cutter 2. The center of the base 23 and the five locations above and below the edges on both sides can be firmly and detachably fastened and fixed to the outer peripheral surface of the circular cutting cutter 1 with the mounting bolts 24 and 33. As a result, by rotating the circular cutting cutter 1 and the step cutting cutter 2 integrated with the circular cutting cutter 1 with the rotating device, as shown in FIG. 9, concentric double grooves L1 having different depths on the paved road surface around the manhole. L2 can be easily formed by cutting.

(Other embodiments)
The mounting bolt 24 provided at the center of the base of the step cutting cutter is not essential. Further, the number of mounting bolts provided on the mounting tool is not limited to two.

1 ... circular cutter, 12 ... cutter bit, 13 ... mounting hole, 2 ... step cutting cutter, 22 ... cutter bit, 24 ... mounting bolt, 3 ... mounting tool, 31 ... board, 32 ... gripping part, 33 ... mounting bolt , 34 ... Magnet body.

Claims (4)

A circular cutting cutter having a cylindrical body provided with a cutter bit on the opening end face of an opening having a predetermined diameter, which is used in a method of installing a manhole frame, has a cutter bit on the outer circumference of the cylindrical body and on a circumference having a diameter larger than the predetermined diameter. It is a mounting structure for mounting a step cutting cutter in which a cylinder is positioned, and is inserted into a plurality of mounting holes which are erected on one surface of the substrate and provided on the peripheral surface of the cylinder. A step in which the step cutting cutter is mounted on the circular cutting cutter by a nut screwed into the mounting bolt, which has a mounting tool provided with a mounting bolt of the above and a grip portion provided on the other surface of the board. Mounting structure of cutting cutter. The mounting structure for a step-cutting cutter according to claim 1, wherein a magnet body is provided that attracts the substrate of the mounting tool to the peripheral surface of the cylindrical body when the mounting bolt is inserted into the mounting hole. Both side edges of the step cutting cutter are connected to the peripheral surface of the cylinder by mounting bolts of the fitting, and the center of the step cutting cutter is connected to the peripheral surface of the cylindrical body by other mounting bolts provided therein. The mounting structure for the combined step-cutting cutter according to claim 1 or 2. A plurality of the mounting holes are provided so that the mounting position of the step cutting cutter can be changed in the vertical direction, and the plurality of mounting holes can be partially shared at different mounting positions of the step cutting cutter. The mounting structure for a step cutting cutter according to any one of claims 1 to 3, which is formed on the peripheral surface of a cylindrical body.