JP3010384U - Circular pavement road cutting device and cutting blade used for the cutting device - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the structure of a paved road surface circular cutting device and to perform circular cutting work of various diameters. [Structure] Base 11 arranged on the side of the road surface circular cut portion
The column 35 is erected on the column, and the sleeve 36 is externally fitted to the column so that the sleeve 36 can be moved up and down. The axis is arranged on the same line as the center point P of the road surface circular cut portion, while the center of the arm 14 projecting in the cross direction is fixed to the lower end of the drive spindle and the cutting blades 15 are fixed to the respective tips of the arm. Then, the cutting tip 60 is fixed to the lower end edge of the cutting blade, the sleeve is lowered to lower the drive spindle, and the motor is rotated to rotate the cutting blade through the arm into a circular circumference. Move along.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pavement road surface circular cutting device for cutting a periphery of a pavement road surface occupant such as a manhole into a circle, and in particular, it makes it possible to easily cut circular shapes having different diameters and to reduce the road surface occupation area. It is easy to install at a predetermined position, and has a simple structure compared to conventional devices and can be provided at extremely low cost.

[0002]

[Prior art]

 Conventionally, the following three types of devices have been proposed as circular cutting devices for this type of paved road surface. First, as shown in FIG. 8, a column 3 is erected on the central position of the lid 1 of the manhole, an arm 4 is projected from the upper end of the column 3, and a driving unit is provided at the tip of the arm 4. The circular cutting blade 5 is attached via 6, and the arm 4 is rotated by the drive unit 6 with the support post 3 as a fulcrum, and the disc-shaped cutting blade 5 is rotated in the vertical direction shown by the arrow in the figure. The blade revolves while rotating, and the road surface R is cut into a circle C as shown by the dotted line. (JP-A-63-27519, JP-A-63-55204)

Second, as shown in FIGS. 9 (A) and 9 (B), a pillar 3 is erected on the central upper surface of the manhole cover 1 or on a reinforcing material, and a sleeve 7 is slidably attached to the pillar 3. And a cylindrical cutting blade 5 having a blade portion 5a provided on the lower edge of the sleeve 7 is fixed to the lower end of the sleeve 7, a cutting blade rotation motor 8 is mounted, and the sleeve 7 is rotated by a cylinder 9 while rotating the cutting blade 5. It descends and cuts the paved road surface into a circle. (JP-A-59-141611)

Thirdly, as shown in FIG. 10, a pillar 3 is erected on a road surface R, a first arm 4A rotated by a first motor 8A is projected from the pillar 3, and Attach the second arm 4B to the front end of the first arm 4A so as to be able to move up and down by the second motor 8B, and attach the third arm 4C that is horizontally rotated by the third motor 8C to the second arm 4B. The blade 5 is attached to the lower end of the third arm 4C. In this apparatus, the cutting blade 5 is lowered by the second motor 4B while the cutting blade 5 is horizontally rotated by the third motor, and is revolved along the circular cutting line by the first motor 4A. The road surface is cut into a circle C. (JP-A 61-277704)

[0005]

[Problems to be solved by the device]

 In all of the above-mentioned three types of cutting devices that have been proposed in the past, the columns are erected on the road surface at the center of the circular cutting part, or on the manhole cover or supporting member, and a mechanism to hold these columns is required. In addition, it takes time to position the support at a predetermined position. In addition, when cutting a small circle, there is a problem that the column holding mechanism becomes larger. Furthermore, if the stanchions are installed on the top surface of the manhole cover or on other supporting members, vibration and load of the drive unit are applied during cutting work, which easily damages the lid or supporting members and causes a large amount of noise during work. Occurs. Moreover, there was a problem that the shoulders around the manhole lid were loosened due to the vibration, and the earth and sand and Alfalto debris fell below the manhole.

[0006] Usually, there are various sizes of manhole lids with diameters of 75, 100, 125, 150, 180, 200 cm, and it is necessary to change the circular area to be cut according to them. Therefore, when using a cylindrical cutting blade as shown in the second type, it is necessary to prepare cylindrical cutting blades of various diameters. Moreover, since the cylindrical cutting blade bends a flat plate to form a cylindrical member, it is difficult to obtain roundness, and it is difficult to manufacture a blade having a large diameter.

Further, when rotating the first type disc-shaped cutting blade in the vertical direction, in order to cut a circle having a small diameter, it is necessary to reduce the diameter of the disc-shaped cutting blade. In that case, the strength of the cutting blade becomes a problem. Therefore, it is difficult to cut a small-diameter circle with the first type.

Furthermore, in the above-mentioned third type, the structure is extremely complicated, for example, three motors are required to revolve and rotate the cutting blade while descending, so that the weight of the entire apparatus becomes large. Therefore, this large weight is applied to the support member for supporting the manhole cover or the like, and there is a problem that the cutting device becomes expensive.

As described above, any of the conventionally proposed circular cutting devices has a problem, and in particular, since the pillar is erected on the road surface and there are many members other than the pillar that occupy the road surface. However, there was a problem that the area occupied by the road surface was likely to be large, which would easily obstruct traffic when cutting the road surface.

The present invention aims to solve the above-mentioned various problems of the conventionally proposed device, and it is necessary not to erect the pillar arranged at the center position of the circular cutting portion on the road surface. An object of the present invention is to provide a paved road surface circular cutting device that occupies the road surface of the cutting device as little as possible and can cut circles of various diameters from small diameters to large diameters and that can be provided at a low cost with a simple structure. I am trying.

[0011]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides a base having four legs, a plurality of wheels including one movable wheel attached to the base, and a plurality of wheels of the base according to claim 1. A pillar projecting from the upper surface, a sleeve that fits over the pillar so that the height can be adjusted, a rotation driving means such as a prime mover mounted on the sleeve, and a bearing portion extending from the sleeve and protruding from the base. A road spindle that is rotatably held by a circular road surface to be cut, and a driving spindle that is placed above with the axis aligned with the center point of the cutting portion and that is rotationally driven by the rotary driving means, and the lower end of the driving spindle. Cross-shaped arms that are detachably fixed to the drive shaft and have the same length at 90 degree intervals around the drive spindle and project horizontally. 4 cutting blades to project A cutting tip fixed to a lower end of each of the cutting blades, the driving spindle is lowered so that the cutting tip comes into contact with a road surface, and the driving motor rotates to cut the cutting blade through the arm. We provide a paved road surface circular cutting device configured to move along a circular circumference.

In the above apparatus, the bearing portion of the sleeve is projected from the front side of the base, the drive main shaft is positioned in front of the base, and a part of the arm is protruded horizontally from the lower end of the drive main shaft. It is located at the bottom of the base, and the left and right legs on the front side of the base are attached so as to be movable in the left-right direction with respect to the frame of the base, and the brackets are attached to the front of these left and right legs. It is preferable that the wheels be attached, and further that a free wheel be attached to the rear central portion of the base via a bracket so that the base can be moved in any direction by these three wheels. (Claim 2)

In the above apparatus, the main shaft of the first handle is rotatably mounted on a mounting plate fixed to the upper end of the column, and the main shaft of the first handle is a screw shaft, and a vertical direction formed on the sleeve. The second handle is rotatably attached to the side surface of the mounting plate, and a bevel gear is interposed between the main shaft of the second handle and the screw shaft. It is preferable that the handle or the second handle is rotated to rotate the screw shaft and the sleeve is moved up and down to adjust the height. (Claim 3)

In the above apparatus, a diamond tip is preferably used as the cutting tip fixed to the lower end of the cutting blade. (Claim 4)

In the above device, a fixed ground is attached to the lower ends of the legs of the base so that the height can be adjusted, and when the wheels move, the fixed ground is lifted to float above the ground, while being fixed to a required position. It is sometimes preferable to lower the ground surface so that the wheels can float above the ground. (Claim 5)

In the above apparatus, the drive main shaft has a cylindrical shape, and cooling water is supplied to the inside thereof, and a cooling tube extending to the tip of each arm is connected to a discharge hole formed at the lower end of the drive main shaft. However, it is preferable that the cooling water can be jetted from the tip of these tubes toward the lower end of the cutting blade. (Claim 6) A hollow portion may be provided in the arm, and the inside thereof may be formed as a cooling water passage. Further, each arm may be divided into two members, and the members may be slidably connected to each other so that the lengths of the arms can be adjusted so as to cope with different diameters of the cut circles.

Further, according to the present invention, in claim 7, a base having four legs, a moving wheel attached to the legs, a column protruding from an upper surface of the base, The sleeve is rotatably held by a sleeve that is height-adjustable externally fitted to the column, a rotational driving means such as a prime mover mounted on the sleeve, and a bearing portion that extends from the sleeve and projects from the base. A drive spindle that is rotationally driven by the rotary drive means while being arranged above with the axis aligned with the center point of the road surface circular cut portion to be cut, and detachably fixed to the lower end of the drive spindle. Cross-shaped arms that project horizontally in the same length at 90 degree intervals around the drive spindle, and four cutting blades that are detachably fixed to the tips of these arms and project downward. A cutting chute that is fixed to the bottom of each cutting blade. And a drive main shaft is positioned in front of the base, and a part of the arm that protrudes horizontally from the lower end of the drive base is protruded from the front side of the base. The left and right legs on the front side of the base so as to be movable in the left-right direction with respect to the frame of the base, and the wheels on the front of these left and right legs via brackets. In addition to the mounting plate, a free wheel is attached to the center of the rear side of the base via a bracket so that the base can be moved in any direction by these three wheels, and the mounting plate is fixed to the upper end of the column. The main shaft of the first handle is rotatably mounted, and the main shaft of the first handle is used as a screw shaft, screwed into a vertical screw hole formed in the sleeve, and attached to a side surface of the mounting plate. Turn the second handle The bevel gear is installed between the main shaft of the second handle and the screw shaft, and the screw shaft is rotated by operating the first handle or the second handle to rotate the sleeve. It is configured to be moved up and down to adjust the height, and the cutting tip fixed to the lower end of the cutting blade is a diamond tip, and the ground is attached to the lower end of the leg of the base so that the height is adjustable, When moving by the wheel, the fixed ground is raised to float above the ground, while when fixed to a required position, the fixed ground is lowered to float the wheel above the ground.The driving spindle is lowered so that the cutting tip comes into contact with the road surface. In addition, there is provided a paved road surface circular cutting device configured to rotate by the prime mover and move the cutting blade along the circumference of the cutting circular shape through the arm.

[0018]

[Action]

 In the paved road surface circular cutting device of the present invention, the drive spindle is rotated by the prime mover while being lowered, the arm protruding from the drive spindle rotates about the drive spindle, and the cutting blade fixed to the arm tip has a cutting circular shape. It moves along the outer circumference and cuts the road surface into a circle with a cutting tip attached to the lower end of the cutting blade.

During the above cutting work, the road surface is cut by a cutting tip, so to speak. However, since a diamond tip of superhardness is used as the cutting tip, the pavement road surface can be cut smoothly. .

When the diameter of the circular shape to be cut is changed, the length of the arm attached to the drive spindle may be changed. Alternatively, if the length of the arm is adjustable, the length of the arm may be adjusted by the adjusting mechanism. Furthermore, if the cutting tip wears due to cutting work, the cutting blade with the cutting tip attached may be replaced and fixed to the drive spindle.

During the cutting work by this device, the pillar that was conventionally installed at the center position of the circular cutting part is eliminated, the drive spindle is positioned above the center position, and the drive spindle is easily positioned at the center position. Since it can be done, it is possible to solve the conventional problem that occurs when the pillar is erected from the center of the circular cutting portion during the cutting work.

Further, since the wheel including one free wheel is attached to the base, the wheel can be easily moved in any direction, and the drive spindle can be easily positioned at the center position of the circular cutting portion. Moreover, at the time of this movement, the fixed ground provided at the lower end of the base is lifted and floated, so that it can be easily moved, and after positioning, the fixed ground is lowered and installed to lift the wheels. Therefore, the base can be easily fixed to the position where it is positioned. In this way, since this device can be easily moved, it can be easily moved to the side of the part to be circularly cut, and the base can be moved on the sidewalk or in a narrow place to move the device to the required position. Can be transported to. It can also be transported to a circular cutting location by a small truck (2-ton vehicle).

[0023]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. A circular paving road surface cutting device (hereinafter abbreviated as cutting device) 10 includes a base 11, a drive mechanism 12 installed on the base 11, and a drive spindle supported by the drive mechanism 12 so as to be vertically movable and rotatably driven. 13, a cross-shaped arm 14 attached to the lower end of the drive spindle 13, a cutting blade 15 attached to each tip of the arm 14, and three wheels 16 (16A, 16B, 16C) attached to the base 11. ) Is the main configuration.

In the present embodiment, the cutting device 10 (excluding the extending portion of the arm 14) has a length L of about 1100 mm, a width W of about 1350 mm, and a height H of about 1400 mm. Is very small and can be easily carried to the required cutting location by mounting it on the bed of a 2-ton truck, for example. After the cutting device 10 is conveyed to the cutting place, it is unloaded from the loading platform and is conveyed by wheels 16 to the side of the paved road surface to be circularly cut.

As shown in FIG. 1, the cutting device 10 vertically extends a drive spindle 13 above a center P of a circular cut portion of a peripheral edge of a manhole cover 1 installed on a road surface R. The arm 14 is projected, and the road surface R is circularly cut by the cutting blade 15 attached to the tip of the arm 14. Therefore, the base 11 is adjusted and installed on the road surface so that the drive spindle 13 is located above the center P of the circular cut portion.

The base 11 is provided with legs 20 at four corners, and upper ends of the left and right legs 20 A and 20 B on the rear side are connected by a left and right frame 21. As shown in FIG. 2 (A), the left and right leg portions 20C and 20D on the front side are bent at their upper ends, and the bent portions are formed to be slightly smaller, so that the left and right leg portions can be slidably inserted through the openings at both ends of the central frame 22. are doing. As shown in FIG. 2 (B), the bending portions 20C-1 and 20D-1 are provided with a plurality of mounting holes 20C-2 and 20D-2 at predetermined intervals, while one end is provided at each end of the central frame 22. Two mounting holes 22a and 22b are provided, and the connecting holes with the mounting holes 20C-2 and 20D-2 are adjusted and fixed to the screw 23. In this way, the distance S between the left and right leg portions 20C and 20D on the front side can be adjusted according to the circular diameter to cut.

A supporting plate 24 is fixed and mounted on the upper surfaces of the central portions of the front central frame 22 and the rear left and right frames 21. Upper plates 25A and 25B are fixed to the upper surfaces of the left and right leg portions 20C and 20D on the front side, and the rear ends of these upper plates 25A and 25B are placed on the upper surfaces of the left and right frames 21.

As shown in FIG. 3B, screw holes 26 each having a lower end opening are formed in the lower part of each of the four legs 20A to 20C, and a fixed ground 27 is fixed to the lower end thereof. The ground 28 is moved up and down by screwing the shaft 28 and rotating the screw shaft 28.

Brackets 29 are provided on the front surfaces of the front leg portions 20C and 20D, respectively, and wheels 16A and 16B are rotatably supported by bearings 30 fixed to the brackets 29. . Further, a bracket 31 is provided so as to project downward at the center of the rear left and right frames 21, a bearing 33 is rotatably attached to the bracket 31 via a shaft 32 in a horizontal direction, and a wheel 16C is attached to the bearing 33. It is attached and used as a free wheel. In this way, the pair of wheels 16A and 16B are attached to both sides on the front side, and the free wheel 16C is attached to the center on the rear side so that the base 11 can be conveyed in any direction.

The lower ends of a pair of main columns 35 are fixedly erected from the central support plate 24, a sleeve 36 is slidably fitted on these columns 35, and a mounting plate 37 is attached to the upper ends of the columns 35. Is fixed. The sleeve 36 includes two tubular portions 36a externally fitted to the support column 35, a coupling portion 36b coupling these tubular portions 36a, and a motor mounting portion 36c extending one side from the coupling portion 36b. It is configured by a bearing portion 36d for the drive main shaft extending in the other direction.

As shown in FIG. 4, a prime mover 38 is mounted on the upper surface of the prime mover mounting portion 36c, and an output shaft 38a of the prime mover 38 is attached to a drive spindle 13 rotatably supported inside the bearing portion 36d. The drive main shaft 13 is rotated by a prime mover 38 by being connected through a transmission means. The transmission means attaches a V pulley 39A to the motor output shaft, attaches a V pulley 39B to the upper end of the drive main shaft 13, and winds a belt 40 around these V pulleys for conduction.

A vertical main shaft 42 of a first handle 41 is rotatably attached to the upper mounting plate 37, and the first handle 41 is rotatably provided on the upper end surface of the mounting plate 37. Further, the horizontal main shaft 44 of the second handle 43 is rotatably attached, and the second handle 43 is rotatably provided on one side surface of the mounting plate 37. The main shaft 42 of the first handle 41 is connected to the main shaft 44 of the second handle 43 via a bevel gear 45, and the main shaft 42 is rotated by the rotation of the first handle 40 or the second handle 42. . A screw shaft below the mounting portion of the bevel gear 45 of the main shaft 42 is a screw shaft, and is screwed into a vertical screw hole 46 formed in the connecting portion 36b of the sleeve 36. Therefore, the first handle 41 or the second handle 41 The main shaft 42 is rotated by the rotation of the handle 43, and the sleeve 36 is moved up and down.

The drive main shaft 13 rotatably supported by the bearing portion 36d of the sleeve 36 is a hollow shaft, and the cooling water is circulated from the upper end opening to the lower end opening through the hollow hole, and the cooling water is supplied to the upper end opening. A supply tube 50 is attached, and as shown in FIG. 6, a tube 51 is attached to a discharge hole 13a provided at the lower end of the drive spindle 13. The drainage tubes 53A to 54D are routed to the respective tubes 51 to the respective tip positions of the cross-shaped arm 14 through the cross-shaped branching tool 52, and jetted downward from the tip openings of the respective tubes to cut the cutting blade 15. I'm trying to cool.

A horizontal flange portion 13b is projectingly provided at the lower end of the drive spindle 13, and a flange portion 14a fixed to the upper surface of the center portion of the cross-shaped arm 14 is superposed on the flange portion 13b. The arm 14 is detachably fixed to the lower end of the drive spindle 13 by a bolt 55 and a nut (not shown).

As shown in FIG. 6, the cross-shaped arm 14 has cutting blade mounting portions 14b to 14e of the same length protruding from the center position at intervals of 90 degrees. Each of these cutting blade mounting portions has a rectangular frame shape, and the tip mounting portions 56A to 56D each having a fitting portion 55 of a smaller rectangular frame shape are slidably fitted to the tip end so that the length of the arm 14 can be adjusted. It has been. While the fitting portion 55 is provided with mounting holes 55a at intervals, one mounting hole is provided at the tip of each cutting blade mounting portion 14b to 14e, and is fixed by a screw 57 at a required position. Further, a rectangular reinforcing plate 65 is welded to the cutting blade mounting portions 14b to 14e spaced by 90 degrees.

Attachment plates 58 are fixed to the tips of the tip attachment portions 56 A to 56 D in a direction orthogonal to each other, and the upper ends of the cutting blades 15 are detachably fixed to the attachment plates 58 with bolts 59. As shown in FIG. 7, when the attachment plate 58 is attached to the tips of the cutting blade attachment portions 14b to 14e of the arm 14 to adjust the arm length, the arm 14 itself may be replaced. Good.

The cutting blade 15 is made of steel, and a cutting tip composed of a diamond tip 60 is fixed to the lower end edge thereof by brazing at a predetermined interval. In this embodiment, the three diamond tips 60 of each cutting blade 15 are fixed, but the number of installations can be changed depending on the length of the cutting blade 15. Although the cutting blade 15 of this embodiment is made of a flat plate, it may be curved in an arc shape. In that case, the circumferential length of the cutting blade 15 is preferably set to 1/20 of the circumference of the cutting circle.

The mounting plate 37 fixed to the upper ends of the pair of columns 35 and the support plate 24 are connected by a pair of support rods 61 to reinforce the columns 35.

Next, the operation process of cutting the peripheral edge of the manhole into a circle using the paved road surface circular cutting device having the above-described configuration will be described. First, as shown in FIG. 1, the cutting device 10 is conveyed to the vicinity of the manhole cover 1. At that time, after transporting to a near place by a truck or the like, it is unloaded from the loading platform and moved by the three wheels 16 attached to the base 11. At this time, the ground surface 27 at the lower ends of the legs 20A to 20D is lifted from the wheels 16 and can be moved smoothly. By using one of the three wheels 16 arranged so as to be positioned at the apexes of the triangle as the free wheel 16C, the drive spindle 13 is moved in any direction so as to coincide with the center point P of the lid 1 of the manhole. it can.

When the drive spindle 13 coincides with the center point P of the manhole cover 1, the ground surface 27 of the four legs 20A to 20D is lowered from the wheel 16 and the wheel 16 is lifted from the ground to lift the ground surface 27. The base 11 is fixed by. The length of the arm 14 of the cutting device 10 and the cutting blade 15 attached to the tip of the arm 14 are set in advance corresponding to the cutting circle corresponding to the diameter of the manhole cover 1, and the circular cutting line of the peripheral edge of the manhole cover 1 is set. However, the length of the arm 14 may be adjusted after the drive spindle 13 is centered at the center point P of the manhole 1.

As shown in FIG. 5, the distance L1 between the cutting blade mounting plates 58 on the diametrical direction of the arm 14, that is, on both ends facing each other is smaller than the distance S between the leg portions 20C and 20D on both front sides. In this case, as shown in FIGS. 5 and 1, the upper ends of the left and right leg portions 20C and 20D of the base 11 are fixed by being set to the minimum distance in contact with the center frame 22. When the circular shape to be cut is large and the distance L1 is larger than the distance S, the front left and right leg portions 20C and 20D are slid in the direction away from the center frame 22, and the distance S is larger than the distance L1. Adjust so that The cutting blade mounting portion of at least one of the four cross-shaped arms 14 is located below the base 11. In other words, the base 11 is located on the upper side of one side of the circular shape to be cut, and the space occupied by the main cutting device 10 on the pavement during the circular cutting can be reduced.

Next, the first handle 41 or the second handle 43 is rotationally operated to lower the sleeve 36, lower the drive spindle 13, and the diamond tip 60 at the lower end of the cutting blade 15 comes into contact with the road surface. Descend to the position.

Next, the prime mover 38 is started, and the drive main shaft 13 is horizontally rotated via the V pulley 39A, the belt 40, and the V pulley 39B. Due to the rotation of the drive spindle 13, the arm 14 rotates around the circular center point P as a fulcrum, the cutting blade 15 moves along the circumference, and the diamond tip 60 at the lower end pushes the road surface into a circular shape.

Thus, as shown in FIG. 5, while rotating the first handle 41 or the second handle 43 to lower the cutting blade 15, the driving motor 38 moves the cutting blade 15 along the circumference. Then, the paved road surface is cut with the diamond tip 60. Depending on the cutting depth, the cutting blade 15 is moved along the entire circumference a required number of times to perform annular cutting with a predetermined depth. At the time of this cutting, the cutting blade 15 cuts the pavement in a circular shape through the lower portion of the base 11.

At the time of the above cutting operation, cooling water is supplied to the cooling water passage at the upper end opening of the drive main shaft 13, and the cooling water is sprayed from the lower end of the drive main shaft 13 toward the cutting blade 15 through the tubes 51, 53A to 53D. This jet of cooling water reduces the heat generation and wear of the diamond tip 60 and the cutting blade 15.

[0046]

[Effect of device]

 As is apparent from the above description, in the paved road surface circular cutting device of the present invention, the drive spindle is arranged above the pillar instead of standing on the road surface at the center position of the cutting circle. It is possible to prevent the supporting surface from being damaged by the vibration and load applied to the upright columns as in the past.

In addition, since the base that is provided with a drive mechanism that supports the drive spindle attached with the cutting blade and that rotates and moves up and down is a mechanism that can be easily moved by wheels, a circular center for cutting the drive spindle is used. Can be easily aligned to. The base itself is smaller than the conventional one, and it is located above a part of the circle that cuts the base, so that the area occupied by the road surface can be reduced.

Further, since the wheels including the free wheels can be attached to the base and can be moved smoothly in any direction, the drive spindle can be easily aligned with the center point of the circular cut portion.

Further, since the diamond tip of superhardness is used as the road surface cutting tip, it is possible to push down the road surface so to speak while lowering the diamond tip. Therefore, the drive mechanism can be simplified because it only has to revolve the cutting blade along the circumference of the cutting circle. Also, since the cutting blade is descended by rotating the screw shaft by rotating the handle to lower the threaded sleeve, only one motor is required to revolve the cutting blade. The structure can be made extremely simple as compared with the conventional structure, and the price, the weight, and the size can be reduced accordingly.

Further, since the arm for attaching the cutting blade has its own length adjustable and is detachably attached to the drive spindle, it is commonly used when cutting various circular shapes from small diameter to large diameter. be able to. Furthermore, by exchanging the cutting blade attached to the tip of the arm, it has various advantages such as being able to cut various circular shapes.

[Brief description of drawings]

FIG. 1 is a perspective view of a paved road surface circular cutting device according to a first embodiment of the present invention.

FIG. 2A is a partial front view of the cutting device, and FIG.
FIG. 7A is a partially enlarged cross-sectional view of (A).

FIG. 3 (A) is a schematic plan view showing a positional relationship between three wheels provided in the cutting device, and FIG. 3 (B) is a partial side view of the cutting device for showing a mounting state of the wheels on a base. is there.

FIG. 4 is an enlarged front view of a main part of a drive unit of the cutting device.

FIG. 5 is a side view showing a state where the pavement is circularly cut by the cutting device.

FIG. 6 is a perspective view of a main part of the cutting device.

7 is a perspective view of a main part showing a modified example of the part shown in FIG.

FIG. 8 is a perspective view of a conventional road surface circular cutting device.

FIG. 9A is a front view of another conventional road surface circular cutting device, and FIG. 9B is a perspective view of a cutting blade used in the cutting device.

FIG. 10 is a front view of another conventional road surface circular cutting device.

[Explanation of symbols]

 10 Cutting Device 11 Base 13 Drive Spindle 14 Arm 15 Cutting Blade 16 (16A, 16B, 16) Wheels 20A-20D Legs 27 Standard Ground 35 Struts 36 Sleeve 38 Motors 41, 43 Handle 42 Spindle Spindle 60 Diamond Tip

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[Procedure amendment]

[Submission date] December 8, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 5

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 6

[Correction method] Change

[Correction content]

Claims (7)

[Scope of utility model registration request] 1. A base having four legs, a plurality of wheels including one movable wheel attached to the base, a pillar protruding from an upper surface of the base, and the pillar. A height-adjustable outer sleeve, rotation driving means such as a prime mover mounted on the sleeve, and a bearing portion extending from the sleeve and protruding from the base are rotatably held and attempt to be cut. A drive spindle that is arranged above the center point of the road surface circular cut portion with its axis aligned and is rotatably driven by the rotary drive means, and is detachably fixed to the lower end of the drive spindle, with the drive spindle as the center. Cross-shaped arms that are 90 degrees apart and have the same length and project horizontally. Four cutting blades that are detachably fixed to each tip of the arm and project downward, and each cutting blade. Fixed at the bottom of And a cutting tip, wherein the cutting tip lowers the drive spindle so as to come into contact with the road surface and is rotated by the prime mover to move the cutting blade along the circumference of the cutting circle through the arm. Circular paving road surface cutting device. 2. A base part of an arm projecting a bearing part of the sleeve from a front side of the base to position a drive main shaft in front of the base and horizontally protruding from a lower end of the drive main shaft. The left and right legs on the front side of the base are attached to the center frame of the base so as to be movable in the left and right direction, and the wheels are attached to the front of these left and right legs via brackets. 2. The circular paving road surface cutting device according to claim 1, wherein the wheel is attached to the center of the rear side of the base through a bracket, and the base can be moved in any direction by these three wheels. . 3. The main shaft of the first handle is rotatably mounted on a mounting plate fixed to the upper end of the support column, and the main shaft of the first handle is used as a screw shaft, and the vertical screw hole is formed in the sleeve. The second handle is rotatably attached to the side surface of the mounting plate by screwing, and a bevel gear is provided between the main shaft of the second handle and the screw shaft. The pavement road surface circular cutting device according to claim 2 or 3, wherein the screw shaft is rotated by rotating the screw shaft to raise and lower the sleeve to adjust the height. 4. The cutting tip fixed to the lower end of the cutting blade is a diamond tip, and the diamond tip is used to cut the road surface by pushing and cutting the road surface. Circular paving road surface cutting device. 5. A fixed ground is attached to the lower ends of the legs of the base so that the height can be freely adjusted, and when the wheels are moved, the fixed ground is raised to float above the ground, while the fixed ground is fixed when fixed to a required position. The paved road surface circular cutting device according to any one of the preceding claims, which is configured to be lowered to float the wheels above the ground. 6. The drive main shaft has a cylindrical shape, cooling water is supplied to the inside thereof, and a cooling tube extending at the tip of each arm is connected to a discharge hole formed at the lower end of the drive main shaft, The pavement road surface circular cutting device according to claim 1, wherein cooling water can be jetted from the tips of the tubes toward the lower end of the cutting blade. 7. A base having four legs, a moving wheel attached to the legs, a pillar protruding from the upper surface of the base, and a height-adjustable external fitting to the pillar. It is rotatably held by a sleeve, a rotation driving means such as a prime mover mounted on the sleeve, and a bearing portion extending from the sleeve and protruding from a base, and is placed at a center point of a circular cutting portion of a road surface to be cut. A drive main shaft, which is arranged above with the axes aligned with each other and is rotationally driven by the rotary drive means, is detachably fixed to the lower end of the drive main shaft and has the same length at 90-degree intervals around the drive main shaft. And a cross-shaped arm that protrudes horizontally, four cutting blades that are detachably fixed to each tip of these arms and project downward, and a cutting tip that is fixed to the lower end of each cutting blade. And above the front side of the above base Is projected bearing portions of the sleeve,
The drive spindle is located in front of the base, and a part of the arm that horizontally projects from the lower end of the drive spindle is located at the lower part of the base, and the left and right legs on the front side of the base are attached to the base. It is movably attached to the base in the left-right direction, and the wheels are attached to the front surfaces of the left and right legs via brackets, and the free wheels are attached to the rear center of the base via the brackets. The three wheels make it possible to move the base in any direction, and the main shaft of the first handle is rotatably mounted on a mounting plate fixed to the upper end of the column, and the main shaft of the first handle is screwed. And a second handle is rotatably mounted on a side surface of the mounting plate by being screwed into a vertical screw hole formed in the sleeve, and a bevel gear between the main shaft of the second handle and the screw shaft. Intervening The first handle or the second handle is rotated to rotate the screw shaft to elevate and lower the sleeve to adjust the height, and the cutting tip fixed to the lower end of the cutting blade is a diamond tip, Moreover, a fixed ground is attached to the lower ends of the legs of the base so that the height can be adjusted freely, and when the wheels are used, the ground is raised to float above the ground, while the ground is lowered when fixed to a required position. As a structure for floating the wheel above the ground, a structure in which the cutting blade is moved along the circumference of the cutting circle through the arm while the driving spindle is lowered so that the cutting tip comes into contact with the road surface and is rotated by the prime mover. This is a circular cutting device for paved road surfaces.