JP2006283326A - Cutter device for road surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutter device for a road surface constructed to perform centering operation of a cut circle in a single operation to make preparation work as simple as possible and manufacturable at a low cost. <P>SOLUTION: The cutter device has a tiltable lifting means 6 of a cutter turning shaft 2 together with a cutter blade 1, and comprises retreatable traveling wheels 16, 17 and turning wheels 10, 11 used when cutting a circle. The cutter blade with a predetermined radius of curvature is replaceably provided at the cutter turning shaft 2. Connecting members 18, 19 having a plurality of engaging bearing parts A, B corresponding to a plurality of cutter blades with different radii of curvature for making an engine part 3, the cutter blade 1 and the cutter turning shaft 2 tiltable and liftable through an engine base 4 are provided to constitute a tiltable lifting mechanism KC, and a grip openable/closable center positioning means 20 is further provided to constitute a turning radius adjusting mechanism KS capable of changing and adjusting the turning radius of the cut circle by selectively changing the engaging bearing parts A, B of the connecting members 18, 19. Different diameter circles can thereby be cut in the road surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a road surface cutter device.

In recent years, while inventions related to road surface cutter devices have increased, as an invention that can cut a road surface into a circular shape with different diameters without moving a drive unit or the like with respect to a base body, The spherical blades 5 having different curvatures are configured to be replaceable, and the positions of the plurality of coupling engaging portions 9 provided in the coupling portion 8 are set so as to match the spherical center positions of the spherical blades 5 having different curvatures. When the spherical blade 5 is replaced, the connecting engagement portion 9 corresponding to the spherical center of the spherical blade 5 is selected, the connecting engagement portion 9 and the engaging portion 10 are connected, and this connecting engagement is selected. Road surface cutting having a tilting mechanism A that can be tilted and adjusted without moving the drive unit 3, the rotating shaft 4, and the spherical blade 5 with respect to the base 2, with the connecting portion 11 between the portion 9 and the engaging portion 10 as a fulcrum Device "(for example, See Patent Document 1.).
JP 2004-324232 A

  However, in the above-described conventional example, the drive adjustment unit, the spherical blade, the rotation shaft, and the substrate on which the drive unit is mounted are replaced with the bolts by changing the direction of the connection adjusting member 14 corresponding to the two kinds of large and small cutting circles. The predetermined part is fixed with a fastening member such as the above. In this configuration, the connection adjusting member 14 can be attached and detached by using a bolt to change the direction of the connection adjusting member 14, and the connection adjusting member 14 for large and small cutting circles can be combined into a large and a small size. However, it is desirable to improve the incidental work and reduce the production cost.

  In the cutting work of the road surface, in one cutting work, the cutting circle centering work, the installation work of the predetermined rotary blade (cutter blade) and the setting of the cutting radius are indispensable preparatory work, and the workability evaluation However, depending on these configurations, the ease of preparation work and the production cost, including the centering operation, are practically problematic.

  The present invention has been made paying attention to the above points, and in a road surface cutting operation, it is configured so that the centering operation of the cutting circle can be performed with one touch, and the preparation operation is simplified as much as possible and can be manufactured at a low cost. An object is to provide a cutter device.

  This invention can solve the said subject by providing the following structure.

  (1) An engine base on which an engine unit for rotating and rotating a circular arc cutter blade for circular cutting via a cutter rotation shaft is mounted, and a base body provided with wheels for circular cutting and wheels for traveling traveling The engine unit is mounted on the base via the engine base, and the engine unit is disposed inside a cutter blade which is the center side of the cutting circle, and the engine unit is mounted. The engine base has a tilting and raising means for tilting up and down the cutter rotating shaft together with the cutter blade, and the cutter rotating shaft is arranged at an intermediate position between the front and rear wheels provided at predetermined positions on the corners of the base. The front and rear wheels have a traveling wheel that can be retreated upward and a turning wheel that is used for circular cutting, and a cutter blade having a predetermined radius of curvature can be exchanged on the cutter rotation shaft. Blade and cutter A tilting elevating mechanism is configured by providing a connecting member having a plurality of engagement bearing portions corresponding to a plurality of cutter blades having different curvature radii for allowing the moving shaft to tilt up and down through the engine base. The gripper has a notch engaging portion at one side of the base body that is substantially coincident with the center of the cutting circle on the axial center of the plurality of engaging bearing portions orthogonal to the cutter rotation axis. A plurality of center positioning means are provided corresponding to the engagement bearing portions, and the center positioning means is gripped and connected to a shaft rod of a separate cutting centering jig device, and the engagement bearing portion of the connection member is provided. A road surface cutter device including a turning radius adjusting mechanism capable of changing and adjusting a turning radius of a cutting circle by selectively changing, and enabling a circular cutting of a road surface with a different diameter.

  (2) The center positioning means intersects the axis of the cutter rotation shaft orthogonal to the side of one side of the base and the center of rotation of the engaging bearing portion at the time of circular turning. A first center positioning means provided with a notch engaging portion at a substantially matching portion, the opening side of the notch engaging portion being outward, and a radius of curvature with respect to the first center positioning means. A bent arm portion with a notch engaging portion is provided at a position that matches the fulcrum of the turning radius of the cutter blade with a different distance and is separated by a predetermined distance along the axis of the cutter rotation shaft. A second center positioning means that can be flipped up and folded via a hinge with a stop function at a site separated by a predetermined distance along a side of one side, and is provided on a shaft rod of a separate cutting centering jig device Pushing the base of the road surface cutter device from the desired direction, the notch engaging part The road surface as set forth in (1) above, wherein the hook-shaped gripping member that is actuated by the urging force of the elastic member when abutting against the shaft rod comprises a plurality of center positioning means having a function of gripping the shaft rod with one touch. Cutter device.

  (3) The turning radius adjustment mechanism has two arms protruding in parallel with the cutter rotation shaft orthogonal to one side of the base, and the cutter rotation shaft with the cutter blade can be used together with the engine base. An engine that includes a first engagement portion at a base portion of the arm portion and a second engagement portion at a distal end portion as a base-side engagement bearing portion that serves as a support shaft when tilting up and down, and is engaged with the first engagement portion. The base side engagement bearing portion includes a first connection engagement portion and a second connection engagement portion having an engagement portion that engages with the second engagement portion. Select one of the first engagement bearing portion and the second engagement bearing portion of the connecting member including the engagement bearing portion and the second engagement bearing portion, and replace the detachable shaft member serving as the support shaft. The tilting elevating mechanism that can change and adjust the turning radius of the cutting circle, and the center positioning means described in the preceding item (2). Is the above (1) Surface cutter device according.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the structure which can perform centering operation of a cutting circle by one-touch in a road surface cutting operation, can simplify a preparatory operation as much as possible, and can suppress the manufacturing cost at low cost. .

  Below, embodiment of the cutter device for road surfaces concerning the present invention is described.

  FIG. 1 is a front view showing a configuration of a main part of a road surface cutter device according to the present invention, (a) is a front explanatory view showing a state during turning in a cutting operation, and (b) is a traveling traveling outside the cutting operation. FIG. 2 is a front explanatory view showing the state at the time, FIG. 2 is an explanatory view showing a main part configuration of the tilting elevating mechanism KC and the turning radius adjusting mechanism KS, (a) is a plan view, and (b) shows the configuration of the connecting member. FIG. 3D is a cross-sectional view taken along the line E-E showing the configuration of the connecting member, FIG. 3 is an explanatory side view of FIG. 2A (a cross-sectional view taken along the line C-C), and FIG. Side main part explanatory view showing a tilted state when a cutter blade having a small radius is attached, FIG. 5 is a side main part explanatory view showing a tilted state when a cutter blade having a large curvature radius is attached, FIG. 6 is an explanatory side view showing the positional relationship between the traveling wheel and the turning wheel on the front wheel side, and FIG. (B) is an explanatory side view showing the retracting mechanism for the moving traveling wheel, FIG. 7 is an explanatory side view showing the arrangement relationship between the moving traveling wheel and the rear wheel side of the turning wheel, a) is a side view of the main part configuration showing the state during traveling, (b) is an explanatory side view showing the main part configuration of the retracting mechanism of the traveling wheel, and (c) is the action of the retracting mechanism of the traveling wheel. FIG. 8 is a cross-sectional view of a main part showing the installation state of a cutter blade cover for dustproofing and soundproofing, and FIG. 9 is a plan view showing the main part of the center positioning means.

  In a circular cutting operation of a road surface, an engine base 4 on which an engine unit 3 for rotating and driving a circular arc cutter blade 1 for circular cutting through a cutter rotating shaft 2 is mounted, and wheels and movement during circular cutting. A base body 5 having wheels for traveling, and the engine unit 3 is mounted on the base body 5 via the engine base 4 and inside the cutter blade 1 on the center side of a cutting circle. An engine base 3 on which the engine unit 3 is disposed and an engine base 4 on which the engine unit 3 is mounted has tiltable lifting and lowering means 6 for tilting up and down the cutter rotating shaft 2 together with the cutter blade 1. A cutter rotating shaft 2 is arranged at an intermediate position between the front and rear wheels provided at a predetermined position, and includes a traveling wheel 17a that can be retreated upward and a turning wheel 11a that is used for circular cutting. The cutter rotating shaft 2 has a predetermined curvature. The cutter blades 1, 1-1 having a diameter can be exchanged, and the radii of curvature for making the engine unit 3, the cutter blade 1, and the cutter rotation shaft 2 tiltable up and down via the engine base 4 are different. Connecting members 18 and 19 having a plurality of engagement bearing portions A and B corresponding to the plurality of cutter blades 1 and 1-1 are provided to constitute a tiltable lifting mechanism KC, and the cutter is rotated on one side of the base 5. A center positioning means that can be opened and closed freely, having notched engaging portions 20b and 20e at portions substantially coincident with the center of the cutting circle on the axis of the plurality of engaging bearing portions A and B orthogonal to the shaft 2. 20 (20A, 20B) are provided corresponding to the engagement bearing portions A, B, and the center positioning means 20 (20A, 20B) is mounted on the shaft rod PS of a separate cutting centering jig device (not shown). And the connecting member 18 The engagement bearing part A of 19, by selectively changing B, provided with a turning radius adjustment mechanism KS capable of controlling change the turning radius R, R1 cutting circle lies as possible the different-diameter-shaped cut in the road surface.

  The center positioning means 20 is a position that serves as a pivotal point for turning at the time of circular cutting and a shaft center of the cutter rotation shaft 2 that is orthogonal to one side of the base body 5 and a shaft center of the engagement bearing portions A and B. A first center positioning means 20A provided with notch engaging portions 20b and 20e at portions substantially matching with each other, with the open sides of the notch engaging portions 20b and 20e facing outward, Cut to a position that matches the fulcrum of the turning radius of the cutter blades 1, 1-1 with different curvature radii with respect to the first center positioning means 20 A and is separated by a predetermined distance along the axis of the cutter turning shaft 2. A bent arm portion 20a in which the notch engaging portion 20b is arranged is separated by a predetermined distance L (see FIG. 2A) along one side of the base 5 via a hinge 20d with a stop function. Second center positioning means 20B that can be flipped up and folded The base 5 of the road surface cutter device is pushed forward from a desired direction onto a shaft rod PS (see FIG. 9) of a separate cutting circle centering jig device (not shown), and the notch engaging portion 20b or 20e is moved to the shaft. A hook-shaped gripping member 25 that is actuated by a biasing force of an elastic member 26 made of a coil spring when coming into contact with the hook PS is composed of a plurality of center positioning means 20A, 20B having a function of holding the shaft PS with one touch. ing.

  The turning radius adjusting mechanism KS projects two base-side arm portions 18g and 19g in parallel with the cutter rotation shaft 2 orthogonal to one side of the base 5 in parallel, and the cutter blade 1 or 1-1. As a base-side bearing engaging portion that serves as a support shaft when the cutter rotating shaft 2 having a tilt is moved up and down together with the engine base 4, the base-side arm portions 18g and 19g have first engaging portions 18a and 19a on the base side. Second engagement portions 18c and 19c are provided at the distal ends of the arm portions 18g and 19g, and the first connection engagement portions 18d and 19d are engine base side bearing engagement portions that engage with the first engagement portions 18a and 19a. And the second connecting and engaging portions 18e and 19e having engaging portions that engage with the second engaging portions 18c and 19c. The first engagement of the connecting members 18, 19 comprising the two engagement bearing portions B A tilting elevating mechanism KC capable of changing and adjusting the turning radius of the cutting circle by simply selecting either the receiving portion A or the second engagement bearing portion B and replacing the detachable shaft member 27 serving as a support shaft; And center positioning means 20 (20A, 20B) according to claim 2.

  Reference numerals 18f and 19f are connection members that are elements constituting the second engagement bearing portion B. The connection members 18f and 19f are provided with the second connecting engagement portions 18e and 19e on the distal end side, and bolts or the like are provided at the end on the base side. Through holes 21 and 22 and a spare hole 23 for fastening members are formed and connected to engine side arm portions 18b and 19b protruding from the engine base 4 side, and the second engagement bearing portion B is used. When the first engagement bearing portion A is used, the connecting members 18f and 19f fastened using the through holes 21 and 22 are used to keep the retracted state upward when the fastening members are extracted from the through holes 22. The connecting members 18f and 19f fastened using the through holes 22 and 23 are maintained upright with respect to the cutter blade rotating shaft 2 as shown in FIG. It does not get in the way when cutting operation using the joint bearing part A It is the sea urchin configuration.

  The engaging bearing portions A and B are formed of a cylindrical body, and a shaft member 27 is inserted into a through-hole of the cylindrical body to form the center of rotation, and the cutter rotating shaft 2 to which the cutter blade 1 is attached is tilted up and down. It has a free configuration.

  12 is a gripping part for moving the device when carrying, moving, and cutting the road surface cutter device, 13 is a fuel tank (for driving the engine), 14 is a water tank for cooling the cutter blade, and 15 is (for example, A water supply on / off valve 7a is a through hole for the transmission belt 7 and the driven pulley 9.

  As shown in the figure, the shaft member 27 formed of a pin or the like is connected by a chain 27a having a predetermined length, and a male screw portion (not shown) is provided at the tip of the chain 27a. The male screw portion can be screwed and held in the female screw portions 18h and 19h screwed into the connecting members 18f and 19f which are elements constituting the portion B.

  The traveling wheels 16 and 17 that can be retreated upward will be described in detail with reference to the drawings.

  1 (b), 6 (a), (b), 7 (a), (b), and (c), for example, the front wheel 16 is a caster having a structure in which the mounting shaft and the shaft of the wheel itself are eccentric. The supporting member 16b that rotatably supports the paired two wheel bodies 16a is suspended so that the two wheel bodies 16a can be turned horizontally, and the action member 16c is lowered downward via an arm 16e that connects the two wheels. Is formed in a U-shape, and a pivot 16d for rotation when the traveling wheel 16 is flipped up and folded is used as a constituent element.

  In addition, for example, the rear wheel 17 is a caster having a structure in which the mounting shaft and the shaft of the wheel itself are eccentric like the front wheel 16 described above, and the support body 17b that rotatably supports the two wheel bodies 17a as a pair. The two wheel bodies 17a are suspended so as to be able to turn horizontally, and an action member 17d is provided in a U-shape through an arm 17i connecting the two wheels, and the traveling wheel 17 is pivoted upward and retracted. Pivoting support shaft 17e, locking cylindrical member 17c mounted horizontally above support 17b, cross-sectional Ω-shaped clamping member 17f for clamping locking cylindrical member 17c, and clamping member 17f as member pieces A bracket 17g is provided as a component, and a support member 17h that supports the wheel body 17a from below when the apparatus is traveling is a constituent element.

  As shown in FIGS. 6 and 7, when the apparatus is traveling, the traveling wheels 16 and 17 have a lower ground point than the turning wheels 10 and 11 used at the time of cutting, and the turning wheels 10 and 11. Is configured to be able to move while floating in the air from the road surface.

  Further, as shown in FIG. 9, the center positioning means 20A has a U-shaped notch engaging portion 20b widening at the opening side end, and a bowl-like member 25 having a semicircular bay-shaped gripping engaging portion 25b. The elastic member 26 made of a coil spring biased in the opening direction is always kept closed and gripped. For example, when a separate centering jig device (not shown) is turned, it can be swung. When the contact portion 25a of the hook-shaped member 25 approaches and contacts the shaft rod PS as a fulcrum, the elastic member 26 once contracts so as to close the leg along the arrow in the figure, and simultaneously the shaft rod PS The elastic member 26 uses the one leg portion 26b of the coil spring as a power point when the shaft member PS is retracted so as to escape together with the contact portion 25a and then the shaft rod PS is fitted into the semi-circular bay-shaped gripping engagement portion 25b. In the direction in which one leg 26a of one coil spring is opened At the same time, the bowl-shaped member 25 is closed, and the semicircular bay-shaped gripping engagement part 25b firmly holds the shaft rod PS, and the center of the turning radius at the time of the cutting operation is reliably set by one-touch operation. .

  As shown in FIG. 8, the cutter blade cover 24 is fixedly provided at a predetermined portion of the base 5, and includes a tiltable elevation range (arrow n) of a predetermined cutter blade that can be used during traveling and cutting operations. It is laid down. Reference numeral 24a denotes an open / close lid, which can be widely opened when exchanging cutter blades or during maintenance.

  Regarding the other symbols, We in FIGS. 2 (b) and 2 (c) is a joint by welding and welding.

  The operation will be described below based on the above-described configuration and drawings.

  When moving or transporting the road surface cutter device according to the present invention to the site where the road surface cutting operation is performed, first, the tilting that matches the cutter blade having a predetermined curvature radius according to the target cutting radius is first performed. If the structure of the elevating mechanism KC is selected and determined as the first engagement bearing portion A or the second engagement bearing portion B, and the cutter blade 1 having the curvature radius R is used and the first engagement bearing portion A is adopted. The first joint engaging portions 18d and 19d which serve as bearing engaging portions of the engine side arm portions 18b and 19b projecting on the engine base side from the first engaging portions 18a and 19a which are base side bearing engaging portions. A shaft member 27 forming a pin is inserted from the lateral direction in the first engagement bearing portions A and A that are engaged and joined together. At this time, as shown in FIG. 4, the connecting members 18f and 19f are in an upright state and are retracted upward.

  When the cutter blade 1-1 having the radius of curvature R1 is used and the second engagement bearing portion B is employed, the connecting members 18f and 19f are fastened with bolts or the like to the through holes 21 and 22 of the engine side arm portions 18b and 19b, respectively. A shaft member 27 forming a pin is inserted from the lateral direction in the second engagement bearing portions B and B connected to each other through the member and connected to the second engagement portions 18c and 18e and 19c and 19e. At this time, a state as shown in FIG. 5 is exhibited.

  In a state where the cutter blade is already mounted, the handle 6a is rotated to act the male screw rod 6d to pull up the female screw cylinder 6e, whereby the engine unit 3 is provided via the engine base 4 with the support shaft 6f as a fulcrum. The drive pulley 8 connected to the drive shaft, the cutter rotation shaft 2 and the driven pulley 9 connected thereto, the drive transmission belt 7 and the like are tilted and raised, and as shown in FIG. ) As shown in FIG.

  As preparatory work before entering the cutting work, (1) with the related parts including the engine base 4 tilted up (by turning the handle 6a to the right), first, (2) a core (not shown) The alignment jig device is installed at a predetermined position such as a lid portion of a manhole, and (3) the open side of the notch engaging portion 20b of the center positioning means 20 is directed toward the shaft rod PS of the centering jig device (not shown). The apparatus is moved using the gripping part 12, and (4) the state in which the notch engaging part 20b is fitted and attached to the shaft rod PS is confirmed. (5) Next, the opening cover part 24a of the cutter blade cover 24 is opened. (6) Next, the action member 16c on the front wheel 16 side of the traveling wheel is pulled up along the arrow c and retracted upward, and the action on the rear wheel 17 side. When the member 17d is pushed down along the arrow E, the wheel 17 Is in a state of state becomes locking cylindrical member 17c retracted upward along the arrow F is clamped moving the traveling wheels 16 is held and 17 is retracted to the clamping member 17f. Then, the turning wheels 10 and 11 at the time of cutting are brought into a grounded state, and the preparation work is completed.

  Next, while driving the engine unit 3 and rotating the cutter blade 1 or 1-1, the handle 6 a of the tilting lift 6 is turned counterclockwise (to the left) to tilt down, and the cutting unit The operator lowers the cutter blade 1 or 1-1 together with the cutter rotation shaft 2 to a predetermined cutting depth, stops the lowering operation at the predetermined depth, and then rotates the cutter blade 1 or 1-1 while the operator rotates the gripping portion. 12 is used to push the cutter device main body at a predetermined speed to cut the road surface.

  When the cutting operation is completed, first, the handle 6a of the tilting lifting and lowering means 6 is turned while rotating the cutter blade, and the cutter blade is tilted upward together with the cutter rotating shaft 2 along the arrow B, so that the cutter blade is lifted from the road surface. After confirming the state of being lifted up and completely floating, the driving of the engine unit 3 is stopped.

  In addition, each of the connecting members 18 and 19 constituting the tilting lift mechanism KC is provided with two shaft members (pins) 27 in total, and the first engagement bearing portion when the cutting circle is small and the turning radius is small. When the cutting circle is large and the turning radius is large, they are inserted into the second engagement bearing portions B and B, respectively.

  In order to check the state of the cutter blade, a transparent window made of a synthetic resin that is visible from the outside is provided at a predetermined position of the opening / closing lid 24a attached to the front side of the cutter blade cover 24. The coolant nozzle for the cutter blade can remove dirt from the inside of the window as appropriate.

  After the work is completed, the operation may be performed in the reverse order of the preparatory work before the work. After the cutter blade is raised, the traveling wheels 16 and 17 are lowered to the grounded state and used for turning at the time of cutting. The device may be moved and transported with the wheels 10 and 11 floating in the air from the road surface. The moving wheels 16 and 17 can be operated with either the hand or the foot using the U-shaped action members 16c and 17d, both when retracted upward and when set in a used state.

  In addition, the front and rear wheels of the turning wheel may be fixed in the tangential direction of the respective turning circles, and both the front and rear wheels use an offset caster in which the mounting shaft and the wheel shaft are offset from each other. Or it is good also as a wheel which can carry out direction regulation.

  In the embodiment, the front and rear wheels have been described for the sake of convenience, but the road surface cutter device itself can move forward and backward, and is not limited to the front and rear wheels.

The front view which shows the principal part structure of the cutter apparatus for road surfaces which concerns on this invention, (a) Front explanatory drawing which shows the state at the time of turning in cutting operation, (b) Front explanatory drawing which shows the state at the time of the mobile travel outside cutting operation Explanatory drawing which shows the principal part structure of tilting raising / lowering mechanism KC and turning radius adjustment mechanism KS, (a) Top view, (b) DD arrow view which shows the structure of a connection member, (c) The structure of a connection member. EE sectional view Side surface explanatory drawing (CC arrow view) of Fig.2 (a) Side surface explanatory drawing showing the tilted state when a cutter blade with a small radius of curvature is attached Side surface explanatory drawing showing the tilted state when a cutter blade with a large radius of curvature is attached Side surface explanatory view showing the positional relationship between the front wheel side of the traveling wheel and the turning wheel, (a) side view of the main part configuration showing the state during traveling, (b) side view showing the retracting mechanism of the traveling wheel. Figure Side surface explanatory view showing the arrangement relationship between the rear wheel side of the traveling wheel and the turning wheel, (a) Side view of the main part configuration showing the state at the time of traveling, (b) The main part of the retracting mechanism of the traveling wheel Side explanatory view showing the configuration, (c) Side explanatory view showing the action of the retracting mechanism of the moving traveling wheel Cross-sectional view of the main part showing the installation status of the cutter blade cover for dust and soundproofing measures The top view which shows the principal part structure of a center positioning means

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter blade 2 Cutter rotation axis | shaft 3 Engine part 4 Engine base 5 Base body 6 Tilt raising / lowering means 7 Drive transmission belt 8 Drive side pulley 9 Drive side pulley 10, 11 Turning wheel 12 Grasp part 13 (For engine drive) Fuel tank 14 Cutter blade cooling water tank 15 Water supply on / off valve 16, 17 Moving traveling wheel 18, 19 Connecting member 20 Center positioning means 24 Cutter blade cover 25 Gutter-like gripping member 26 Elastic member (coil spring)
27 Shaft member (pin)
KC Tilt lifting mechanism KS Turning radius adjustment mechanism

Claims (3)

  From an engine base on which an engine unit for rotating and driving a circular arc cutter blade for circular cutting via a cutter rotation shaft is mounted, and a base body provided with wheels for circular cutting and wheels for traveling traveling The engine portion is mounted on the base via the engine base, and the engine portion is disposed on the inner side of the cutter blade which is the center side of the cutting circle, and the engine portion is mounted on the base. Has a tilting and raising means for tilting up and down the cutter rotating shaft together with the cutter blade, and the cutter rotating shaft is arranged at the middle position of the front and rear wheels provided at predetermined positions on the corners of the base. Both the rear wheel includes a traveling wheel that can be retreated upward and a turning wheel that is used for circular cutting, and a cutter blade having a predetermined curvature radius can be exchanged on the cutter rotating shaft, and the engine unit, the cutter blade, and the cutter Rotation axis Providing a connecting member having a plurality of engagement bearing portions corresponding to a plurality of cutter blades having different curvature radii for tilting and raising and lowering through the engine base to constitute a tilting and raising mechanism; Gripper opening / closing center positioning means having a notch engaging portion at a position substantially coincident with the center of the cutting circle on the axial center of the plurality of engaging bearing portions orthogonal to the cutter rotation axis on one side Corresponding to the engagement bearing portion, and the center positioning means is gripped and connected to a shaft rod of a separate cutting centering jig device, and the engagement bearing portion of the connection member is selectively selected. A road surface cutter device comprising a turning radius adjusting mechanism capable of changing and adjusting a turning radius of a cutting circle by changing the cutting radius, and enabling a circular cutting of a road surface with a different diameter.   The center positioning means is a position that serves as a pivot point of rotation when cutting the circular axis and the axis of the cutter bearing shaft orthogonal to the side of one side of the base body, and substantially coincides with the axis of the engaging bearing portion. The first center positioning means provided with a notch engaging portion at a site to be disposed, and the opening side of the notch engaging portion facing outward, and the curvature radius different from those of the first center positioning means. A bent arm portion with a notch engaging portion is provided on one side of the base at a position that matches the fulcrum of the turning radius of the cutter blade and is spaced a predetermined distance along the axis of the cutter rotation shaft. A second center positioning means that can be flipped up and folded via a hinge with a stop function at a part separated by a predetermined distance along the side, and a road surface cutter on the shaft rod of a separate cutting centering jig device The base of the apparatus is pushed forward from a desired direction, and the notch engaging portion is moved to the shaft. 2. The road surface according to claim 1, wherein the hook-shaped gripping member that is operated by the urging force of the elastic member when it comes into contact with the plurality of center positioning means has a function of gripping the shaft rod with a single touch. Cutter device.   The turning radius adjusting mechanism projects two arms parallel to each other with a cutter rotation shaft orthogonal to one side of the base, and lifts and lowers the cutter rotation shaft having a cutter blade together with the engine base. An engine base-side bearing that includes a first engaging portion at the base of the arm portion and a second engaging portion at the distal end as a base-side engaging bearing portion that serves as a support shaft, and engages with the first engaging portion The first engagement bearing includes a second connection engagement portion having a first connection engagement portion as an engagement portion and an engagement portion engaging with the second engagement portion. By simply selecting one of the first engagement bearing part and the second engagement bearing part of the connecting member consisting of a part and a second engagement bearing part and replacing the detachable shaft member that becomes the support shaft, 3. A tiltable lifting mechanism capable of changing and adjusting the turning radius of the cutting circle, and the center positioning means according to claim 2. Road cutter apparatus of claim 1, wherein the door.

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