Rake for grooving

Abstract

To provide a rake for grooving that can easily apply force evenly on the right and left sides regardless of worker's skill, and straighten grooves' paths of multiple grooves as a whole that are formed on concrete laid and leveled before hardening and bring them to an excellent state with uniform depth.SOLUTION: A rake for grooving 10 is to form grooves 72 onto concrete 70 that is laid and leveled before hardening. The rake for grooving 10 comprises a grip part 20 that a worker can grip with hands, a claw support member 30 provided at a lower end part of the grip part 20 and formed long in a transverse direction of the grip part 20, claws 34 that are provided side by side with a comb-shape on the claw support member 30 to form the grooves 72 onto the concrete 70, and a guide slider 40 that is provided at the grip part 20 and supports the grip part 20 so as to be capable of oscillating in a formation direction of the grooves 72 and is guided by a rail 75 placed along the formation direction of the grooves 72 above the concrete 70.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a grooving rake for forming grooves in leveled concrete before curing.

Background Art

[0002] Conventionally, since concrete pavement laid on highways and the like gradually becomes a slippery road surface due to aging wear, there is a construction method called the tining grooving method in which grooves are provided in advance with piano wire (steel tine) during construction on such concrete pavement. As a technique for providing grooves in concrete, the technique of Patent Document 1 is known.

[0003] The technique of Patent Document 1 is a concrete compaction roller rake that realizes a mortar surface layer in which coarse aggregates floating on the surface are submerged during surface compaction of an earthen slab or the like during concrete placement. A plurality of disks are attached to a single shaft with gaps to form a cylindrical shape, and it has a bearing that enables the cylindrical rotation and a handle above the bearing.

[0004] The operator holds the handle and slowly pushes and pulls several times without deliberately applying pressure in the groove formation direction. As a result, the outer ends of the plurality of disks sink the floating coarse aggregates, and the surface layer becomes a uniform mortar layer. The outer ends of the disks cause rolling and kneading during rotation, and the coarse aggregates are uniformly compacted.

[0005] Here, the grooves formed in a streak shape in leveled concrete or the like are required to be straight and have a uniform depth.

[0006] However, in the concrete roller rake of Patent Document 1, an operator holds a single handle and stands on a work board or the like arranged beside the groove being constructed, and operates the concrete roller rake from the side of the groove rather than from the front of the groove. Therefore, it is difficult to apply force evenly in the front-back, left-right directions. As a result, during construction, the handle may tilt left and right, causing the depth of the groove to be different on the left and right, or the depth to be different even within a single groove, or the groove may not be straight but curved in the forming direction of the groove, and the state of the groove is affected by the skill of the operator.

[0007] Also, since the disk is pushed and pulled several times during construction, it is difficult to accurately pass through the exact same position when passing the disk through the groove formed after the first pass for the second and subsequent times. There is a risk that the groove will be partially scraped and the groove width will be different within a single groove. Furthermore, when correction is required due to insufficient groove depth, the operator has to hold a single handle and align multiple disks with multiple grooves based on visual perception, making the correction difficult.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] In view of the above points, an object of the present invention is to provide a grooving rake that can easily apply force evenly left and right regardless of the skill of the operator, make the groove alignment of the entire plurality of grooves formed in the evenly spread pre-hardened concrete straight, and have a uniform and good depth state.

Means for Solving the Problems

[0010] According to an embodiment of the present invention, there is provided a grooving rake for forming grooves in evenly spread pre-hardened concrete, It is characterized by including a handle part that can be held by an operator's hand, a claw support member provided at an end of the handle part and formed long in the lateral direction of the handle part, claws provided in a comb shape on the claw support member for forming grooves in the concrete, and a guide slider provided on the handle part for supporting the handle part so as to be swingable in the groove forming direction and guided by a rail arranged along the groove forming direction above the concrete.

[0011] According to such a configuration, the grooving rake includes a handle part that can be held by an operator's hand, and claws arranged in a comb shape on a claw support member provided at an end of the handle part for forming grooves in the concrete. And the handle part is provided with a guide slider for supporting the handle part so as to be swingable in the groove forming direction and guided by a rail arranged along the groove forming direction above the concrete. Therefore, the grooving rake can be linearly moved along a rail spanning in the lateral direction (width direction) of the road. Further, since the handle part can be swung in the groove forming direction, a force can be evenly applied to the entire claws provided side by side on the claw support member from left and right, and the depth of the grooves can be adjusted and formed evenly. In this way, the grooving rake of the present invention can easily apply a force evenly from left and right regardless of the skill of the operator, making the grooves of the plurality of grooves formed in the laid and uncured concrete straight and having a uniform and good depth.

[0012] Preferably, the guide slider includes a guide main body part formed long in the swinging direction of the handle part for swingably supporting the handle part, upper surface casters provided on the front end side and the rear end side of the guide main body part respectively for rolling contact with the upper surface of the rail, first side surface casters provided on the front end side and the rear end side of the guide main body part respectively for rolling contact with one side surface of the rail, and second side surface casters provided on the front end side and the rear end side of the guide main body part respectively for rolling contact with the other side surface of the rail.

[0013] According to such a configuration, since the guide slider is provided with upper surface casters that rollingly contact the upper surface of the rail on the front end side and the rear end side of the guide main body portion respectively, it is possible to eliminate the vertical shaking of the grooving rake and keep it at a constant height. Further, since the guide slider is provided with a first side surface caster that rollingly contacts one side surface of the rail and a second side surface caster that rollingly contacts the other side surface of the rail on the front end side and the rear end side of the guide main body portion respectively, it is possible to eliminate the lateral shaking of the grooving rake and keep a straight track in plan view. For this reason, regardless of the skill of the operator, the grooves of the entire plurality of grooves formed in the evenly laid concrete before hardening can be made straight and the depth can be made uniform and in good condition.

[0014] Preferably, the handle portion is provided in a T shape on the claw support member and includes a vertically long claw-side vertical bar formed in the vertical direction of the handle portion, a lower horizontal bar provided intersecting in the middle of the claw-side vertical bar and supported by the guide slider, an upper horizontal bar arranged parallel to the lower horizontal bar and provided intersecting the upper portion of the claw-side vertical bar and grippable by the operator, and an operator-side vertical bar arranged parallel to the claw-side vertical bar on the opposite side of the claw-side vertical bar with reference to the guide slider and provided intersecting the lower horizontal bar and the upper horizontal bar and formed long upward.

[0015] According to such a configuration, the handle portion forms a rectangle with a vertically long claw-side vertical bar, a lower horizontal bar supported by the guide slider, an upper horizontal bar grippable by the operator, and an operator-side vertical bar formed long upward on the opposite side of the claw-side vertical bar with reference to the guide slider. Therefore, the operator can hold the operator-side vertical bar and the upper horizontal bar with each hand respectively, and while facing the handle portion forward, even though being on the side of the groove to be formed, by simply moving or swinging the handle portion in the front-rear direction, it is possible to easily apply force evenly to the left and right on the entire claws arranged in the left-right direction (lateral direction) of the claw support member, and the grooves of the entire plurality of grooves formed in the evenly laid concrete before hardening can be made straight and the depth can be made uniform and in good condition.

[0016] Preferably, the claws are piano wires or hard steel wires.

[0017] According to such a configuration, since the claws are piano wires or hard steel wires, the claws can be bent appropriately to form the groove when constructing the groove. Furthermore, by making the claws into piano wires or hard steel wires, the width of the claws and the interval between the claws can be freely set, and the groove width and the interval between the grooves can be freely formed.

[0018] Preferably, the tip of the claw is curved toward one side in the groove forming direction.

[0019] According to such a configuration, since the tip of the claw is curved toward one side in the groove forming direction, by pressing the claw against the concrete along the curve, the claw can be smoothly bitten into the concrete to form a good groove.

[0020] Preferably, the claw support member is detachably provided on the handle portion.

[0021] According to such a configuration, since the claw support member is detachably provided on the handle portion, by preparing claw support members with different claw widths and intervals in advance, grooves with different groove widths and different intervals can be formed only by replacing the claw support member.

Advantages of the Invention

[0022] It is possible to provide a grooving rake that can easily apply force evenly on both left and right sides regardless of the skill of the operator, make the groove alignment of the entire plurality of grooves formed in the evenly laid concrete before hardening straight, and have a uniform depth and good state.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

MODE FOR CARRYING OUT THE INVENTION

[0024] Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings conceptually (schematically) show a grooving rake.

EXAMPLE

[0025] The surrounding situation where the grooving rake 10 is used will be described. As shown in FIG. 7, for example, when constructing a road, curb stones 71 are arranged along the extending direction of the road at both ends of the road. Note that a square bar or a formwork may be installed instead of the curb stone 71. The upper surfaces of the curb stones 71 at both ends of the road are higher than the upper surface of the spread concrete 70, and a work board 74 on which an operator stands and moves along the lateral direction (width direction) of the road is stretched between the curb stones 71 on both sides. Further, rails 75 are stretched along the lateral direction (width direction) of the road between the curb stones 71 on the groove 72 forming side of the work board 74.

[0026] Next, the grooving rake 10 will be described. As shown in FIG. 1, the grooving rake 10 forms grooves 72 (see FIG. 7) in the leveled concrete 70 before hardening. The grooving rake 10 includes a handle part 20 that can be gripped by an operator by hand, a claw support member 30 provided at the lower end of the handle part 20 and formed long in the lateral direction of the handle part 20, claws 34 provided in a comb shape on the claw support member 30 to form the grooves 72 in the concrete 70, and a guide slider 40 provided on the handle part 20 to support the handle part 20 so as to be swingable in the groove-forming direction and guided by a rail 75 arranged along the groove-forming direction above the concrete 70. The groove 72 is a transverse groove formed in the width direction (lateral direction) of the road.

[0027] Next, the handle part 20 will be described. The handle part 20 includes a claw-side vertical bar 21 provided in a T shape on the claw support member 30 and formed long in the vertical direction of the handle part 20, a lower horizontal bar 22 provided at an intersection of 90 degrees in the middle of the claw-side vertical bar 21 and rotatably supported in the circumferential direction by the guide slider 40, an upper horizontal bar 23 arranged in parallel with the lower horizontal bar 22 and provided at an intersection of 90 degrees at the upper part of the claw-side vertical bar 21 and grippable by an operator 80 (see FIG. 7), and an operator-side vertical bar 24 arranged in parallel with the claw-side vertical bar 21 on the opposite side of the claw-side vertical bar 21 with reference to the guide slider 40 and provided at an intersection of 90 degrees with the lower horizontal bar 22 and the upper horizontal bar 23 and formed long upward.

[0028] Thereby, in the handle part 20, the claw-side vertical bar 21, the lower horizontal bar 22, the upper horizontal bar 23, and the operator-side vertical bar 24 form a rectangle in a front view. The claw-side vertical bar 21, the lower horizontal bar 22, the upper horizontal bar 23, and the operator-side vertical bar 24 are connected by welding. In the embodiment, the claw-side vertical bar 21, the lower horizontal bar 22, the upper horizontal bar 23, and the operator-side vertical bar 24 are respectively connected by welding, but it is not limited thereto, and they may be connected by fasteners, and other connection methods may be used as long as they can be connected, and further, they may be integrally formed.

[0029] Next, the guide slider 40 will be described. As shown in FIGS. 2 and 3, the guide slider 40 includes a guide main body 41 that is formed long in the swinging direction of the handle portion 20 and swingably supports the handle portion 20 (lower horizontal bar 22), upper surface casters 51 that are respectively provided on the front end side and the rear end side of the guide main body 41 and rollingly contact the upper surface of the rail 75, first side surface casters 61 that are respectively provided on the front end side and the rear end side of the guide main body 41 and rollingly contact one side surface of the rail 75, and second side surface casters 65 that are respectively provided on the front end side and the rear end side of the guide main body 41 and rollingly contact the other side surface of the rail 75.

[0030] Further, a bearing portion 42 that rotatably supports the lower horizontal bar 22 is provided on the upper surface of the guide main body 41. The lower horizontal bar 22 supported by the bearing portion 42 is held in a sandwiching manner from above by a holding member 43, and the holding member 43 is fastened to the bearing portion 42 by a fastening member 44. Note that a lateral movement restricting member for restricting the lateral (axial) movement of the lower horizontal bar 22 with respect to the bearing portion 42 may be provided.

[0031] Also, a rod-shaped fixing member 45 extending in the width direction (lateral direction) of the guide main body 41 is provided on the guide main body 41. A side plate 46 is provided on one side (operator side) of the fixing member 45, and the first side surface caster 61 is provided on the side plate 46.

[0032] The first side surface caster 61 includes a support member 62 provided on the side plate 46, a shaft 63 provided on the support member 62, and a wheel 64 rotatably provided on the shaft 63 and rollingly contacting one side surface of the rail 75.

[0033] In addition, a second side surface caster 65 is provided on the other side (groove side) of the fixing member 45. The second side surface caster 65 includes a support member 66 fastened to the other side (groove side) of the fixing member 45 by a fastening member 47, a shaft 67 provided on the support member 66, and a wheel 68 rotatably provided on the shaft 67 and rollingly contacting the other side surface of the rail 75.

[0034] Furthermore, the second side casters 65 provided on the tip side of the guide body 41 and the second side casters 65 provided on the rear end side of the guide body 41 are connected by a reinforcing bar 69. This firmly fixes the front and rear second side casters 65, enabling stable movement of the guide slider 40.

[0035] In addition, in the second side caster 65, the lateral position of the second side caster 65 may be adjustable by a fastening member 47 for the caster. This allows the position of the second side caster to be adjusted so that there is no lateral play with respect to the rail 75, and furthermore, it can easily accommodate rails 75 of different widths.

[0036] Next, the claw support member 30 and the claw 34 will be described. As shown in FIGS. 1 and 4, a claw support member 30 is provided at the lower end of the claw-side vertical bar 21 of the handle part 20 via a mounting plate 31. The mounting plate 31 is fastened to the claw-side vertical bar 21 by a fastening member 32. The claw support member 30 is fastened to the mounting plate 31 by a fastening member 33. In this way, by removing the fastening member 32 or the fastening member 33, the claw support member 30 is detachably provided on the handle part 20.

[0037] Also, the claw 34 is a piano wire. Note that the claw 34 may be made of hard steel wire. By making the claw 34 of piano wire or hard steel wire, the claw 34 can be appropriately bent to form the groove 72 during the construction of the groove 72. Furthermore, by making the claw 34 of piano wire or hard steel wire, the width of the claw 34 and the interval between the claws 34 can be freely set, and the groove width and the interval between the grooves 72 can be freely formed. In FIG. 4(B), the intervals between the claws 34 (grooves 72) are made equal, but it is not limited to this, and the intervals between the claws 34 (grooves 72) may be unequal. Since the vehicle running noise may increase when the intervals between the claws 34 (grooves 72) are equal, these intervals do not have to be equal.

[0038] In FIG. 4(A), the claw 34 is shown as straight, but it is not limited to this. The tip of the claw 34 may be curved toward one side in the formation direction of the groove 72. If the claw 34 is straight, there is a risk that the aggregate on the paving surface of the concrete 70 may hit the tip of the claw 34 and cause it to pop up. Therefore, it is preferable that the tip of the claw 34 is curved. By pressing the claw 34 against the concrete 70 along the curve, the claw 34 can be smoothly embedded in the concrete 70 to form a good groove 72.

[0039] Next, the operation of the grooving rake for Comparative Example 1, Comparative Example 2, and the Example will be described. FIG. 5(A) is an operation diagram of the grooving rake 100 of Comparative Example 1. In the grooving rake 100 of Comparative Example 1, a claw support member 102 is provided at the tip of the handle 101, and a plurality of claws 103 are provided on the claw support member 102, and it is formed in a T shape as a whole. When the grooving rake 100 of Comparative Example 1 is used, an operator 80 standing on the work plate 74 cannot hold the grooving rake 100 in front, so it is difficult to apply force evenly in the left-right width direction of the claw support member 102. For this reason, it is difficult to make the groove alignment, depth, etc. formed in the concrete 70 good, and the quality of the groove depends on the skill of the operator 80.

[0040] FIG. 5(B) is an operation diagram of the grooving rake 110 of Comparative Example 2. In the grooving rake 110 of Comparative Example 2, a claw support member 102 is provided at the tip of the handle 101, a plurality of claws 103 are provided on the claw support member 102, and the handle 101 is inclined from the connecting portion 104 toward the operator 80 with respect to the claw support member 102. Further, a guide slider 105 guided by the rail 75 is provided near the lower end of the handle 101. When the grooving rake 110 of Comparative Example 2 is used, by guiding the guide slider 105 on the rail 75 spanning in the width direction of the road, the grooving rake 110 can be made into a straight track. However, since the handle 101 is inclined, it is difficult to make the claw support member 102 horizontal, and the depth of the groove is likely to be uneven on the left and right. Furthermore, since the inclination angle of the handle 101 with respect to the claw support member 102 is fixed, it is impossible to adjust the force application according to the place where the hardening of the concrete 70 paving has progressed and the place where the hardening has not progressed.

[0041] FIG. 5(C) is an operation diagram of the grooving rake 10 of the embodiment. The handle portion 20 has a rectangular shape when viewed from the front. For this reason, the operator 80 standing on the work plate 74 can hold the grooving rake 10 in front and apply force evenly in the left-right width direction of the claw support member 30. Furthermore, by guiding the guide slider 40 on the rail 75, the grooving rake 10 can be made into a straight track and the inclination of the grooving rake 10 can be easily adjusted, so that the groove alignment, depth, etc. can be made uniform. Further, just by placing the guide slider 40 on the rail 75 from above, the setting of the grooving rake 10 to the rail 75 is completed, and the time can be shortened. In addition, it is possible to place a weight on the claw support member 30, and by placing a weight on the claw support member 30, the depth of the groove 72 to be formed can be adjusted.

[0042] Next, the state of the groove after construction according to the comparative example and the embodiment will be described. FIG. 6(A) is a plan view of the groove 72 after construction according to the comparative example, and shows the case where the grooving rake 100 of Comparative Example 1 in FIG. 5(A) is used. In the comparative example, since the grooving rake 100 is operated by the visual sensation of the operator, it is difficult to correct the groove 72 so as to be straight along the once-constructed groove 72, such as when the depth of the groove 72 is insufficient.

[0043] FIG. 6(B) is a plan view of the groove 72 after construction according to the embodiment. In the embodiment, by guiding the guide slider 40 along the rail 75 extending in the width direction of the road, it is possible to easily correct the groove 72 so as to be straight along the once-constructed groove 72, such as when the depth of the groove 72 is insufficient. Further, since the grooving rake 10 is used while being inclined in the formation direction of the groove 72, when forming the groove 72 in a place close to a structure such as the curb 71, it is necessary to once remove the grooving rake 10, change the direction, and perform construction from the vicinity of the curb 71 (a place almost in contact with the curb 71). However, by guiding the guide slider 40 along the rail 75, the distance from the rail 75 to the claw support member 30 (claw 34) can be made constant, and it is easy to align the joints of the groove 72.

[0044] Next, the operation of the grooving rake 10 according to the embodiment and the formation state of the groove 72 will be described. As shown in FIG. 7, the operator 80 can stand on the working board 74 spanned between the curbstones 71 at both ends of the road, hold the grooving rake 10 facing forward, and apply a uniform force to the entire left and right sides of the claw support member 30 to form a groove 72 in the evenly spread concrete 70. Further, by guiding the guide slider 40 along the rail 75 spanned between the curbstones 71 at both ends of the road, the distance from the rail 75 to the claw support member 30 (claw 34) can always be kept constant, and the groove 72 can be formed in a straight line. Furthermore, since the guide slider 40 is provided with an upper surface caster 51, a first side surface caster 61, and a second side surface caster 65, even if there are irregularities such as scratches on the rail 75, the guide slider 40 can be smoothly guided without being caught, and the grooving rake 10 can be pulled smoothly. As a result, the paths of the grooves 72 of the entire plurality of grooves 72 can be made straight and the depth can be made uniform and in good condition.

[0045] Next, the effects of the grooving rake 10 of the embodiment described above will be described. In the embodiment of the present invention, the grooving rake 10 includes a handle portion 20 that can be grasped by hand by the operator 80, and claws 34 that are arranged in a comb shape on the claw support member 30 provided at the end of the handle portion 20 to form grooves 72 in the concrete 70. And the handle portion 20 is provided with a guide slider 40 that supports the handle portion 20 so as to be swingable in the groove 72 forming direction and is guided by a rail 75 arranged along the groove 72 forming direction above the concrete 70. Therefore, the grooving rake 10 can be linearly moved along the rail 75 spanned in the lateral direction (width direction) of the road. Further, since the handle portion 20 can be swung in the groove 72 forming direction, a uniform force can be applied to the entire claws 34 provided side by side on the claw support member 30 from left to right, and the depth of the groove 72 can be adjusted and formed uniformly. In this way, the grooving rake 10 of the present invention can easily apply a uniform force from left to right regardless of the skill of the operator 80, making the paths of the grooves 72 of the entire plurality of grooves 72 formed in the evenly spread concrete 70 before hardening straight and the depth uniform and in good condition.

[0046] Furthermore, since the guide slider 40 is provided with upper surface casters 51 that rollingly contact the upper surface of the rail 75 on the front end side and the rear end side of the guide main body 41 respectively, it is possible to eliminate the vertical shaking of the grooving rake 10 and keep it at a constant height. Furthermore, since the guide slider 40 is provided with a first side surface caster 61 that rollingly contacts one side surface of the rail 75 and a second side surface caster 65 that rollingly contacts the other side surface of the rail 75 on the front end side and the rear end side of the guide main body 41 respectively, it is possible to eliminate the lateral shaking of the grooving rake 10 and keep a straight track in plan view. For this reason, regardless of the skill of the operator 80, the paths of the plurality of grooves 72 formed in the evenly spread pre-cured concrete 70 can be made straight and the depth can be made uniform and in good condition.

[0047] Furthermore, the handle part 20 is formed by a vertically long claw-side vertical bar 21, a lower horizontal bar 22 supported by the guide slider 40, an upper horizontal bar 23 that can be gripped by the operator 80, and an operator-side vertical bar 24 that is formed long upward on the opposite side of the claw-side vertical bar 21 with respect to the guide slider 40 to form a rectangle. Therefore, the operator 80 holds the operator-side vertical bar 24 and the upper horizontal bar 23 with each hand respectively, and while facing forward with the handle part 20 in front, even though the operator is on the side of the groove 72 to be formed, by simply moving or swinging the handle part 20 in the front-rear direction, it is possible to easily apply force evenly to the left and right to all of the claws 34 arranged in the left-right direction (lateral direction) of the claw support member 30, and the paths of the plurality of grooves 72 formed in the evenly spread pre-cured concrete 70 can be made straight and the depth can be made uniform and in good condition.

[0048] Furthermore, since the claws 34 are piano wires or hard steel wires, it is possible to form the grooves while the claws 34 flex appropriately during the construction of the grooves 72. Furthermore, by making the claws 34 into piano wires or hard steel wires, the width of the claws 34 and the interval between the claws can be freely set, and the groove width and the interval between the grooves 72 can be freely formed.

[0049] Furthermore, since the claw support member 30 is detachably provided on the handle portion 20, by preparing claw support members 30 with different claw widths and different intervals between the claws 34 in advance, it is possible to form grooves 72 with different groove widths and different intervals by simply replacing the claw support member 30.

[0050] Furthermore, since the tip of the claw 34 is curved toward one side in the groove forming direction, by pressing the claw 34 against the concrete 70 along the curve, the claw 34 can be smoothly embedded in the concrete 70 to form a good groove 72.

[0051] In the embodiment, the handle portion 20 is rectangular in a front view and composed of a claw side vertical bar 21, a lower horizontal bar 22, an upper horizontal bar 23, and an operator side vertical bar 24. However, the present invention is not limited to this, and it may be triangular or U-shaped in a front view. As long as the operator 80 can hold the handle portion 20 facing forward (extending left and right with the guide slider 40 as a boundary and also extending upward on the operator 80 side), other shapes may also be acceptable.

[0052] That is, as long as the functions and effects of the present invention are achieved, the present invention is not limited to the embodiments.

Industrial Applicability

[0053] The technology of the present invention is suitable for a grooving rake for forming grooves in evenly spread concrete before hardening.

Explanation of Reference Numerals

[0054] 10... Grooving rake (joint cutting cutter device) 20... Handle portion (handle) 21... Claw side vertical bar 22... Lower horizontal bar 23... Upper horizontal bar 24... Operator side vertical bar 30... Claw support member 34... Claw (piano wire, hard steel wire) 40... Guide slider 41... Guide main body portion 42... Bearing portion 43… Suppression member 51… Top caster 61… First side caster 65… Second side caster 70… Concrete (unevenly spread concrete before hardening) 71… Kerb (angle bar, formwork) 72… Groove (cross groove) 74… Work board 75… Rail 80… Worker

Claims

1. A raking tool for grooving that forms grooves in the evenly spread concrete before hardening, comprising: a handle portion that can be gripped by an operator by hand; a claw support member provided at an end of the handle portion and formed long in the lateral direction of the handle portion; claws provided in a comb shape on the claw support member for forming grooves in the concrete; and a guide slider provided on the handle portion for supporting the handle portion so as to be swingable in the groove forming direction and guided by a rail arranged along the groove forming direction above the concrete. A raking tool for grooving, characterized in that it has the above components.

2. The raking tool for grooving according to Claim 1, wherein the guide slider includes a guide main body portion formed long in the swinging direction of the handle portion for swingably supporting the handle portion; upper surface casters provided on the front end side and the rear end side of the guide main body portion respectively for rolling and contacting the upper surface of the rail; first side surface casters provided on the front end side and the rear end side of the guide main body portion respectively for rolling and contacting one side surface of the rail; and second side surface casters provided on the front end side and the rear end side of the guide main body portion respectively for rolling and contacting the other side surface of the rail. A raking tool for grooving, characterized in that it has the above components.

3. The raking tool for grooving according to Claim 1 or Claim 2, wherein the handle portion includes a claw side vertical bar provided in a T shape on the claw support member and formed long in the vertical direction of the handle portion; a lower horizontal bar provided intersecting in the middle of the claw side vertical bar and supported by the guide slider; an upper horizontal bar arranged parallel to the lower horizontal bar and provided intersecting the upper part of the claw side vertical bar for being grippable by an operator; and an operator side vertical bar arranged parallel to the claw side vertical bar on the opposite side of the claw side vertical bar with respect to the guide slider and provided intersecting the lower horizontal bar and the upper horizontal bar and formed long upward. A raking tool for grooving, characterized in that it has the above components.

4. The raking tool for grooving according to Claim 1 or Claim 2, wherein the claw is a piano wire or a hard steel wire. A raking tool for grooving, characterized in that it has the above component.

5. The raking tool for grooving according to Claim 1 or Claim 2, wherein the claw is characterized in that its tip portion is curved to one side in the groove forming direction. A raking tool for grooving, characterized in that it has the above component.

6. The raking tool for grooving according to Claim 1 or Claim 2, The claw support member is detachably provided on the handle portion, and the rake for grooving is characterized by this.

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