Connecting member, rotating body set, and concrete finishing apparatus

Abstract

To provide a connecting member and a rotary body set capable of realizing a concrete finishing device having convenience at a low cost, and the concrete finishing device having them.SOLUTION: This connecting member for connecting the body part of the concrete finishing device having a structure joinable by a screw in an end part and a rotary body, has at least a body joining part having a through-hole fitted to the body part in the end part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a connecting member used for a concrete finishing device used to flatten and level the surface of concrete, a rotating body set including the connecting member, and a concrete finishing device equipped with them. [Background technology]

[0002] At civil engineering and construction sites, concrete pouring work involves pouring ready-mixed concrete (concrete before it hardens) into forms to create the foundation of a building. This work involves leveling the surface of the poured concrete to make it flat and smooth (hereinafter referred to as "concrete leveling work"). Traditionally, concrete leveling work has been done manually by craftsmen using trowels, but manual work is inefficient and requires a lot of man-hours, so craftsmen must have considerable skill to maintain a certain level of quality. Meanwhile, the construction industry is currently facing a labor shortage, which is affecting concrete leveling work as well, resulting in an even greater shortage of skilled craftsmen.

[0003] In this situation, concrete leveling work using dedicated equipment (machines) is becoming common at sites with large pouring areas, and is also being carried out at sites with smaller pouring areas. Trowels, which are used to finish concrete floors to a flat surface, are used for concrete leveling work.

[0004] Concrete leveling work using equipment such as a trowel (concrete finishing equipment) typically involves two steps: (1) using a flat rotating disk to press down on the concrete surface to remove air bubbles from inside the poured concrete and smooth out any unevenness on the surface (hereinafter referred to as "rough leveling"), and (2) using a rotary trowel with multiple blades to level the concrete surface evenly (hereinafter referred to as "finish leveling"). In concrete leveling work, the finish leveling usually follows the rough leveling step. Some concrete finishing equipment can perform both tasks by incorporating a structure that allows the rotary disk used for the rough leveling step to be attached to the rotary trowel used for the finish leveling step. There are various types of concrete finishing equipment, including hand-operated models that can be pushed by the worker and mounted models that the worker rides on. However, even hand-operated models are heavy, difficult to transport and store, and expensive. Even if an attempt is made to reduce the price by making it possible to perform both rough leveling and finish leveling as described above, the unit price tends to be high to begin with, and the weight tends to be heavy.

[0005] Proposals have been made to solve these problems with concrete finishing equipment. For example, Japanese Patent Application Laid-Open Publication No. 2011-230497 (Patent Document 1) proposes a ready-mixed concrete leveler equipped with a rotary trowel assembly consisting of a rotary trowel and a rotary stay. In the ready-mixed concrete leveler described in Patent Document 1, the grass-cutting rotary blade assembly attached to a conventional shoulder-mounted grass cutter can be removed, and a rotary trowel assembly can be detachably attached to it, allowing it to be used as a leveler. The rotary trowel assembly is composed of a rotary trowel and a rotary stay, and can be removed by loosening a locking nut. This simple configuration and features contribute to weight reduction and cost reduction.

[0006] Japanese Patent Publication No. 7132666 (Patent Document 2) proposes a concrete leveling machine that can level concrete on walls and ceilings as well as floors by lifting the main body by hand. In the concrete leveling machine described in Patent Document 2, a connecting member connects the drive shaft of a motor that rotates a rotating disk that is circular in plan view to the rotating shaft of the rotating disk, and the connecting member is connected to the rotating disk by engaging the tip of a retaining member provided on the driven shaft of a universal joint that constitutes the connecting member with a horizontal hole in a connector attached to the rotating disk. With this configuration, the concrete leveling machine described in Patent Document 2 is smaller and lighter than general concrete finishing devices such as trowels, making it easy to operate while held by hand. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-230497 [Patent Document 2] Patent No. 7132666 Summary of the Invention [Problem to be solved by the invention]

[0008] The ready-mixed concrete leveling machine described in Patent Document 1 has a rotary trowel assembly, in which the rotary trowel and rotary stay are integrated, fastened to the bolt shaft with a locking nut, making it possible to perform finish leveling work using the rotary trowel. However, if an assembly with a rotating plate instead of the rotary trowel is to be installed for rough leveling work, the locking nut must be tightened through the gap between the rotating stay and the rotating plate, making the installation extremely difficult and possibly impossible. Even if a structure were used that allows the rotating plate to be attached to the rotary trowel, the increased weight would make work difficult and could result in insufficient power. Furthermore, installing the rotary trowel assembly is not easy, as it is installed using the same method as installing the grass-cutting rotary blade assembly.

[0009] In the concrete unevenness control machine described in Patent Document 2, the rotating disk is attached by inserting the driven shaft of the connecting member into the connecting fixture attached to the top, so the installation work is not difficult. However, unlike the ready-mixed concrete leveling machine described in Patent Document 1, the concrete unevenness control machine described in Patent Document 2 is not configured using a shoulder-mounted grass cutter, but has a unique configuration, including the structure for attaching the rotating disk, making it difficult to reduce costs.

[0010] The present invention has been made in light of the above-mentioned circumstances, and an object of the present invention is to provide a connecting member and rotating body set that can realize a low-cost, convenient concrete finishing device, and a concrete finishing device equipped with them. [Means for solving the problem]

[0011] The present invention relates to a connecting member that connects a main body of a concrete finishing device having a structure at its end that allows it to be joined with a screw to a rotating body, and the above-mentioned object of the present invention is achieved by providing at least a main body joint portion at the end that has a through hole that fits into the main body portion.

[0012] The above-mentioned object of the present invention can be more effectively achieved by further providing a rotating body joint portion that is parallel to the main body joint portion, has an opening in the center, and is joined to the rotating body, and a cylindrical side portion that is fixed to the main body joint portion and the rotating body joint portion, or by having a plurality of drilled holes in the rotating body joint portion for joining to the rotating body with screws, or by having a plurality of drilled holes in the main body joint portion for connecting to the rotating body with screws, or by having all but one of the drilled holes have a predetermined length in the circumferential direction of the connecting member and are shaped so that a screw can be inserted by moving it in the circumferential direction.

[0013] The present invention also relates to a rotating body set, and the above-mentioned object of the present invention is achieved by including the connecting member and the rotating body, and is more effectively achieved when the rotating body is a turntable. Alternatively, the present invention relates to a rotating body set including the connecting member and the rotating body, and the above-mentioned object of the present invention is achieved when the rotating body is a turntable, and a plurality of male screws are provided on a surface of the turntable that does not come into contact with concrete, and the male screws are inserted into drilled holes in the connecting member so that the turntable is connected to the connecting member.

[0014] The present invention also relates to a concrete finishing device comprising the above-mentioned connecting member, the rotating body, and the main body, and the above-mentioned object of the present invention is achieved by connecting the rotating body at the end of the main body via the connecting member.

[0015] The above object of the present invention is more effectively achieved by the main body having a structure that allows it to be used as a brush cutter by attaching a cutting blade to the end portion. [Effects of the Invention]

[0016] The connecting member of the present invention connects the main body and rotor of the concrete finishing device via the connecting member, so the connection between the main body and the connecting member and the connection between the connecting member and the rotor can be performed separately, and each connection can be easily performed. Therefore, even for rough leveling work, a concrete finishing device that uses the main body of a brush cutter with a blade connected by screws can be used, resulting in a low-cost, convenient concrete finishing device. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing an example (first embodiment) of a connecting member according to the present invention. [Figure 2] FIG. 2 is a perspective view illustrating an example of a configuration for attaching a cutting blade to a mounting portion of a brush cutter. [Figure 3]3A and 3B are diagrams showing a connecting member in the first embodiment, in which FIG. 3A is a plan view and FIG. 3B is a front cross-sectional view. [Figure 4] FIG. 2 is a perspective view for explaining an example (first embodiment) of a configuration for attaching a connecting member to an attachment part of a brush cutter. [Figure 5] FIG. 1 is a perspective view showing an example of a rotating disk. [Figure 6] FIG. 10 is a perspective view showing an example (first embodiment) in which a rotating disk is connected to an attachment portion using a connecting member. [Figure 7] FIG. 10 is a perspective view showing an example (second embodiment) of a connecting member according to the present invention. [Figure 8] FIG. 10 is a side view showing an example (second embodiment) in which a rotating disk is connected to an attachment portion using a connecting member. [Figure 9] FIG. 10 is a plan view showing an example (third embodiment) of a connecting member according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] The connecting member according to the present invention connects the main body of a concrete finishing machine to a rotating body such as a turntable. The connecting member according to the present invention has a structure that enables the main body of a brush cutter to be used as the main body of the concrete finishing machine. A brush cutter is a machine that cuts weeds, undergrowth, etc. by rotating an attached blade (cutting blade), and is typically used in relatively narrow spaces and has a lightweight structure. In a brush cutter, the cutting blade is typically joined to the main body with a screw, so the connecting member according to the present invention is designed to connect the main body, which has a structure at its end that allows for joining with a screw, to the rotating body.

[0019] By making it possible to use the main body of a brush cutter as the main body of the concrete finishing device, the cost of the concrete finishing device can be reduced. Furthermore, it can be used for concrete leveling work at small-scale sites, is lightweight, and even workers who are not sufficiently skilled in concrete leveling work can perform the work while maintaining quality. Brush cutters come in a variety of types, including electric types using batteries or power cords and engine-powered types, and the handle shapes of the handle part include two-handed handles, loop handles, and two-grip handles. By using the connecting member of the present invention, it is possible to realize a concrete finishing device that takes advantage of the characteristics of these types and is suited to the application and function.

[0020] In the present invention, as described above, the main body and the rotating body of the concrete finishing device are connected via a connecting member. In other words, the main body and the rotating body are connected by connecting the main body and the connecting member, and then connecting the connecting member to the rotating body. Since both connections can be made separately in this way, even when connecting the turntable used for rough leveling work to the main body, the connecting member can be easily connected to the main body with screws. This makes it possible to use the present invention for rough leveling work. Note that it is also possible to connect a rotary trowel to the main body instead of the turntable via the connecting member, making it possible to use the present invention for finish leveling work.

[0021] In a brush cutter, the blade is usually joined to the main body by fitting a protrusion on the blade holder attached to the end of the main body into a hole (mounting hole) drilled in the center of the blade, so the connecting member of the present invention has a main body connecting part with a through hole that fits into the main body, allowing the connecting member to be stably connected to the main body of the concrete finishing device.

[0022] The connecting member of the present invention can be, for example, shaped to have a main body joint that joins with the main body of the concrete finishing device, a rotor joint that joins with the rotor, and a side portion that is fixed to the main body joint and the rotor joint (hereinafter referred to as a "cup type"), or it can be shaped to have only a main body joint (hereinafter referred to as a "disc type").

[0023] The connecting member and the rotating body can be connected using, for example, screws. When connecting with screws, a plurality of drill holes for inserting the screws are drilled in the connecting member. The drill holes can be drilled at the connecting portion of the rotating body in the case of a cup-shaped connecting member, and at the connecting portion of the main body in the case of a disk-shaped connecting member.

[0024] In the connecting member according to the present invention, all or all but one of the drilled holes can be shaped to have a predetermined length in the circumferential direction of the connecting member and to allow screws to be inserted by moving them circumferentially. By shaping the drilled holes in this way, the turntable can be connected in a position where its central axis is offset from the central axis of the connecting member during rough leveling work, and when the turntable is rotated in this state, the turntable can be vibrated and rotated.

[0025] The present invention may be realized as the above-mentioned connecting member, or as a rotating body set including the connecting member and the rotating body. When the rotating body included in the rotating body set is a rotating disk, for example, the rotating disk can be connected to the connecting member by providing a plurality of male screws on a surface that does not contact concrete and inserting the male screws into the drilled holes in the connecting member.

[0026] The present invention may be realized as a concrete finishing machine comprising a connecting member, a rotor, and a main body. In this case, the rotor can be connected to the end of the main body via the connecting member. Also, by attaching a cutting blade to the end of the main body, it can be used as a brush cutter.

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same components are given the same reference numerals, and their description may be omitted. Furthermore, the numerical values, shapes, etc. in the following description are examples, and the present invention is not limited to these.

[0028] Fig. 1 shows an example (first embodiment) of a connecting member according to the present invention. Fig. 1 is a perspective view of the connecting member 1. The connecting member 1 has a cup-like shape and is designed so that the main body of a brush cutter can be used as the main body of a concrete finishing device.

[0029] Here, we will explain the location where the cutting blade is attached to the brush cutter (hereinafter referred to as the "attachment part"). Note that the brush cutter used in this embodiment is different from brush cutters that have an operator riding on them to cut grass, and is used by the operator by hanging it over the shoulder or carrying it on the back.

[0030] A brush cutter typically consists of a motor, a shaft, and a blade. The circular blade is attached to the end (end) of the rod-shaped shaft, and the blade is rotated at high speed by the power of the motor. The blade is operated with a handle attached to the shaft to cut grass. The parts excluding the blade (motor, shaft, handle, etc.) form the main body of the brush cutter, and the end of the shaft where the blade is attached is the mounting part. The blade is joined to the mounting part with screws. Specifically, the blade is attached to the mounting part using a blade holder, a blade retainer (sometimes called a "clamp washer"), and screws.

[0031] An example of the structure for attaching the cutting blade to the attachment part is shown in Figure 2. Figure 2 is a perspective view showing the components required for attaching the cutting blade 80 to the attachment part 40 of the brush cutter 2, with the components separated, with the surface of the cutting blade 80 facing the ground facing downwards. Note that Figure 2 shows some of the structure in a simplified form.

[0032] A male screw (bolt) 61 paired with a female screw (nut) 62 is joined to the mounting part 40 of the brush cutter 2. The blade receiving bracket 50 has a cylindrical protrusion 51 in its center, and a hole for inserting the male screw 61 is drilled in the center of the protrusion 51. The cutting blade 80 has a mounting hole 81 drilled in its center, the same size as the outer periphery of the protrusion 51 of the blade receiving bracket 50. The mounting holes 81 have a uniform size, for example, a diameter of 25.4 mm. The blade presser bracket 70 is shaped like a truncated cone, and has a recessed recess in the center of the top surface (the surface with the smaller area of ​​the truncated cone), and like the blade receiving bracket 50, has a hole in its center for inserting the male screw 61.

[0033] The blade receiving bracket 50 is attached to the mounting portion 40 by inserting the male screw 61 into a drilled hole. The cutting blade 80 is attached to the mounting portion 40 by fitting the protrusion 51 of the blade receiving bracket 50 into the mounting hole 81 to attach the cutting blade 80, inserting the male screw 61 into a drilled hole in the blade holder bracket 70 to attach the blade holder bracket 70, and then screwing the female screw 62 into the male screw 61. When attaching the cutting blade 80, the cutting blade 80 is fixed to prevent rotation using a dedicated metal rod or the like, and since the male screw 61 and the female screw 62 are usually reverse-threaded, the male screw 61 and the female screw 62 are screwed into each other counterclockwise (left-handed), opposite to how ordinary screws are threaded. The cutting blade 80 is removed by reversing the procedure of attachment.

[0034] In the brush cutter 2, the male screw 61 is joined to the mounting part 40, but some brush cutters have a screw hole with a spiral groove attached to the inside of a female screw provided in the mounting part, and the male screw is screwed into the screw hole to attach the cutting blade 80, or a brush cutter that uses a stabilizer plate together with a blade holder. The connecting member 1 of this embodiment is designed so that the main body of any brush cutter can be used as the main body of a concrete finishing device.

[0035] The connecting member 1 connects a rotating body such as a rotating disk to the mounting part 40 instead of the cutting blade 80, so that the device in which the main body of the brush cutter 2 and the rotating body are connected can be used as a concrete finishing device.

[0036] The connecting member 1 is composed of a main body joint 10, a rotary body joint 20, and a side portion 30. Fig. 3(A) shows a plan view of the connecting member 1, and Fig. 3(B) shows a cross-sectional view of the connecting member 1 shown in Fig. 3(A) taken along line AA. As shown in Fig. 3(B), the connecting member 1 has a shape with an internal space.

[0037] The main body joint 10 is disk-shaped and is joined to the main body of the brush cutter 2 used as the main body of the concrete finishing equipment. The connecting member 1 is connected to the mounting part 40 of the main body, which is joined with the male screw 61, using the blade receiving bracket 50, the blade presser bracket 70, and the female screw 62, just like the cutting blade 80. Therefore, a through hole 11 is drilled in the center of the main body joint 10, the same size as the outer periphery of the protrusion 51, into which the protrusion 51 of the blade receiving bracket 50 is fitted, just like the cutting blade 80. The diameter of the through hole 11 is, for example, 25.4 mm, just like the mounting hole 81 of the cutting blade 80.

[0038] Since the main body joint 10 joins with the bottom surface of the blade presser fitting 70 (the surface with the larger area of ​​the truncated cone), the size (outer circumference) of the main body joint 10 is larger than the bottom surface of the blade presser fitting 70, for example, the outer diameter is 58 mm. The thickness of the main body joint 10 (the length in the vertical direction in Figure 3(B)) is set so that the connecting member 1 has an appropriate strength and is not too heavy, for example, 2 to 3 mm.

[0039] The rotor joint 20 is disk-shaped and is joined to the rotor. The rotor joint 20 is annular with a circular opening 21 that is approximately the same size as the outer periphery of the main body joint 10. The opening 21 and the outer periphery of the main body joint 10 may be different sizes.

[0040] The connecting member 1 is connected to the rotating body using a screw. As described below, the connecting member 1 is connected using a male screw provided on the rotating body, and therefore, holes (drilled holes) 22 into which the male screw is inserted are drilled in the rotating body joint 20. Therefore, the size (outer circumference) of the rotating body joint 20 is set to a size that allows the drilled holes 22 to be drilled and that ensures a stable connection between the connecting member 1 and the rotating body. For example, the outer diameter of the rotating body joint 20 is 100 mm. In this embodiment, three drilled holes 22a, 22b, and 22c are drilled in the rotating body joint 20 at equally spaced intervals in the circumferential direction, at the center positions in the radial direction (left-right direction in FIG. 3(B)) of the outer and inner circumferences (outer circumference of the opening 21) of the rotating body joint 20. Note that the number of drilled holes 22 does not have to be three, and may be two, four, or more. However, three is preferable in consideration of stability and the number of steps required for drilling.

[0041] The thickness of the rotary body joint 20 (the length in the vertical direction in FIG. 3(B)) is the same as the thickness of the main body joint 10. However, the thickness of the rotary body joint 20 may be different from that of the main body joint 10.

[0042] In the connecting member 1, the rotor joint 20 is parallel to the main body joint 10. The distance between the rotor joint 20 and the main body joint 10 (the vertical distance in FIG. 3(B)) is, for example, 42 mm so that the blade holder 70 is completely stored in the internal space of the connecting member 1 when the connecting member 1 is connected to the mounting part 40. Furthermore, the center of the rotor joint 20 and the center of the main body joint 10 are aligned in a plan view (when viewed from above in FIG. 3(B)). In other words, the connecting member 1 attached to the mounting part 40 rotates with the central axis of the rotor joint 20 and the central axis of the main body joint 10 aligned.

[0043] The side surface portion 30 is fixed to the outer peripheral edge of the main body joint portion 10 and the inner peripheral edge of the rotor joint portion 20, forming a cylindrical shape. As described above, the outer periphery of the main body joint portion 10 and the opening 21 of the rotor joint portion 20 are approximately the same size. Therefore, the inner periphery of the surface where the side surface portion 30 is fixed to the main body joint portion 10 (the upper surface in FIG. 3(B)) is smaller than the inner periphery of the surface where the side surface portion 30 is fixed to the rotor joint portion 20 (the lower surface in FIG. 3(B)) by approximately the thickness of the side surface portion 30, resulting in a truncated cone shape. The thickness of the side surface portion 30 is the same as the thickness of the main body joint portion 10 and / or the rotor joint portion 20. Note that the inner peripheries of both sides of the side surface portion 30 may be the same size, and the thickness of the side surface portion 30 may be different from the thickness of the main body joint portion 10 and the rotor joint portion 20.

[0044] The connecting member 1 is made of a material that takes into consideration lightness, strength, corrosion resistance, etc., and is made of aluminum, for example. Note that the connecting member 1 may also be made of a material other than aluminum.

[0045] The connecting member 1 is attached to the mounting portion 40 in the same manner as when attaching the cutting blade 80 to the mounting portion 40. Figure 4 shows an example of the configuration when attaching the connecting member 1 to the mounting portion 40, with the components separated. The connecting member 1 is attached to the mounting portion 40 by fitting the protrusion 51 of the blade receiving metal fitting 50 into the through-hole 11 drilled in the main body joint 10 of the connecting member 1, inserting the male screw 61 into the hole drilled in the blade holding metal fitting 70 to attach the blade holding metal fitting 70, and then screwing the female screw 62 into the male screw 61.

[0046] A description will be given of the rotating body connected to the attachment portion 40 by the connecting member 1. In this embodiment, a rotating disk used in rough leveling work and the like is used as the rotating body.

[0047] An example of a turntable is shown in Figure 5. Figure 5 is a perspective view of a turntable 90. The turntable 90 is disk-shaped, and the surface that comes into contact with the concrete (the lower surface in Figure 5) is flat to level the surface of the concrete. The size of the turntable 90 can be set according to the scale of the rough leveling work, as with turntables used in general concrete finishing equipment. However, if it is too large, it may become heavy and make the work difficult, so an appropriate size (e.g., 28 cm in diameter) is set with workability in mind. The thickness of the turntable 90 (the length in the vertical direction in Figure 5) is also set with workability in mind, and is, for example, 2 to 3 mm. The turntable 90 is made of the same material as turntables used in general concrete finishing equipment. For example, the turntable 90 is made of iron, resin, etc.

[0048] The turntable 90 is connected to the connecting member 1 using screws, and male screws 91 for connecting to the connecting member 1 are provided on the surface that does not come into contact with concrete (the upper surface in FIG. 5 ). The male screws 91 are inserted into drilled holes 22 drilled in the rotating body joint 20 of the joint 1. Three drilled holes 22a, 22b, and 22c are drilled in the rotating body joint 20, and therefore three male screws 91a, 91b, and 91c are provided on the turntable 90. The turntable 90 is joined so that its central axis coincides with the central axis of the rotating body joint 20, and therefore the male screws 91a, 91b, and 91c are provided at equal intervals in the circumferential direction at positions that are the same distance from the center of the turntable 90 as the distance from the center of the rotating body joint 20 to the drilled holes 22a, 22b, and 22c.

[0049] The rotating disk 90 is connected to the connecting member 1 by inserting the erected male screw 91 into the drilled hole 22 drilled in the rotating body joint 20 and screwing in the female screw paired with the male screw 91.

[0050] An example of connecting the turntable 90 to the mounting part 40 using the connecting member 1 is shown in Figure 6. Figure 6 is a perspective view of the connected state. To connect the turntable 90 to the mounting part 40, first the connecting member 1 is attached to the mounting part 40, and then the turntable 90 is connected to the connecting member 1. Therefore, when attaching the connecting member 1 to the mounting part 40, the turntable 90 does not get in the way, and the blade holder 70 can be attached and the female thread 62 can be screwed into place. Furthermore, when removing the turntable 90, for example to replace it, it is removed from the connecting member 1, which is easier than removing the cutting blade 80 from the brush cutter 2.

[0051] Although the side surface portion 30 of the connecting member 1 is shaped like a truncated cone, the side surface portion 30 may also be shaped like a cylinder, a rectangular prism, a truncated pyramid, or the like. In this case, the shape of the main body joint portion 10 may be changed to match the shape of the side surface portion 30, or it does not have to match the shape of the side surface portion 30 as long as the side surface portion 30 is fixed to the main body joint portion 10. The rotating body joint portion 20 is shaped like a disk, but may be other shapes, such as a square, as long as it has an opening 21 and can be drilled with a drilling hole 22. Furthermore, the rotating disk 90 is connected to the connecting member 1 using screws, but connection by methods other than screws is also possible. For example, the rotating disk 90 may be connected to the connecting member 1 by placing members that clamp a portion of the outer periphery of the rotating body joint portion 20 of the connecting member 1 from above and below on the surface of the rotating disk 90 that does not come into contact with concrete.

[0052] Another embodiment of the present invention will now be described. The connecting member 1 in the first embodiment is cup-shaped and made up of a main body joint 10, a rotary body joint 20, and a side surface 30, but it can also be disk-shaped and only includes a main body joint.

[0053] FIG. 7 shows an example of a disk-shaped connecting member (second embodiment). FIG. 7 is a perspective view of the connecting member 3. The connecting member 3 is composed only of a disk-shaped main body joint portion that is joined to the main body portion of the brush cutter 2. Similar to the main body joint portion 10 of the first embodiment, a through hole 111 for fitting the protrusion 51 of the blade receiving bracket 50 is drilled in the center with the same size as the outer periphery of the protrusion 51. Furthermore, since the connecting member 3 is connected to the rotating disk 90 using a screw, the connecting member 3 is drilled with drilled holes 112 (drilled holes 112a, 112b, and 112c) for inserting the male screw 91 provided on the rotating disk 90, similar to the rotating body joint portion 20 of the connecting member 1. The thickness and / or material of the connecting member 3 may be the same as or different from those of the connecting member 1.

[0054] Similar to the connecting member 1, the connecting member 3 is connected to the mounting portion 40 of the main body portion to which the male screw 61 is joined, using the blade receiving fitting 50, the blade pressing fitting 70, and the female screw 62. Then, the blade pressing fitting 70 is sandwiched between the connecting member 3 and the rotating disk 90, and the rotating disk 90 is connected to the connecting member 3.

[0055] An example of connecting the turntable 90 to the mounting portion 40 using the connecting member 3 is shown in Figure 8. Figure 8 is a side view of the connected state. The connecting member 3 is attached to the mounting portion 40 by fitting the protrusion 51 of the blade receiving bracket 50 into the through hole 111, inserting the male screw 61 into the hole drilled in the blade holder bracket 70 to attach the blade holder bracket 70, and screwing the female screw 62 into the male screw 61. Then, the male screw 91 provided on the turntable 90 is inserted into the drilled hole 112 drilled in the connecting member 3, and the female screw is screwed into the male screw, so that the blade holder bracket 70 is sandwiched between the connecting member 3 and the turntable 90, and the turntable 90 is connected to the connecting member 3.

[0056] Like the rotary joint 20 of the connecting member 1, the connecting member 3 does not have to be disk-shaped, and may be in other shapes such as a square.

[0057] In the first embodiment, the turntable 90 is connected to the connecting member 1 so that its central axis coincides with the central axis of the rotary joint 20 of the connecting member 1; however, it is also possible to shift the central axis so that the turntable 90 can be connected to the connecting member 1. By shifting the central axis (hereinafter referred to as "central axis shift"), the turntable 90 vibrates when rotated. By adding vibration to the movement of the turntable 90, it becomes easier to adjust unevenness in the surface of hardened concrete than with normal rotation alone. Adding vibration to the movement of the turntable 90 normally requires a motor or the like to generate vibration, but vibration can be added using the simple method of central axis shift.

[0058] An example (third embodiment) of a connecting member that enables central axis shifting is shown in Fig. 9. Fig. 9 is a plan view of a connecting member 4. In this embodiment, the central axis shifting is enabled by forming a hole drilled in the connecting member 4 in a shape that allows a male screw 91 provided on a rotating disk 90 to be inserted by moving it in the circumferential direction.

[0059] 3, the connecting member 4 has a rotating body joint 120 instead of the rotating body joint 20. In other words, the connecting member 4 is composed of the main body joint 10, the rotating body joint 120, and the side surface portion 30.

[0060] Three drilled holes 122a, 122b, and 22c are drilled in the rotor joint 120, and the drilled hole 22c is a circular drilled hole similar to that in the first embodiment. The drilled holes 122a and 122b are curved so that the connecting member 4 can move circumferentially around the drilled hole 22c when a male screw 91 is inserted into each drilled hole. When the male screws 91a and 91b inserted into the drilled holes 122a and 122b, respectively, are inserted into the positions indicated by arrow P1 in FIG. 9, the central axis of the turntable 90 coincides with the central axis of the rotor joint 120. However, when the insertion positions of the male screws 91a and 91b approach the position indicated by arrow P2, the central axis of the turntable 90 deviates from the central axis of the rotor joint 120. The closer the insertion positions of the male screws 91a and 91b are to the position indicated by arrow P2, the greater the deviation of the central axis, and the greater the deviation, the greater the vibration of the turntable 90. Therefore, by adjusting the insertion positions of the male screws 91a and 91b, the magnitude of the vibration of the turntable 90 can be adjusted.

[0061] Although the drilled hole 22c of the connecting member 4 is circular, it may be curved, similar to the drilled holes 122a and 122b. It is sufficient that at most one of the drilled holes has a curved shape. Furthermore, although the drilled holes of the connecting member 4 are curved to enable the central axis shift, other methods may be used to enable the central axis shift. For example, circular drilled holes may be drilled at the positions indicated by arrows P1 and P2 in FIG. 9 , and male screws 91a and 91b may be inserted into the drilled holes drilled at the position indicated by arrow P2, respectively, to shift the central axis. The drilled hole shapes of this embodiment are also applicable to the connecting member 3 of the second embodiment.

[0062] In the above embodiment, the rotating body is a turntable 90, but a rotary trowel used in finish leveling work may also be used as the rotating body. Furthermore, the main body of the brush cutter 2 is used as the main body of the concrete finishing device, but it does not have to be the main body of a brush cutter, and a dedicated device may be manufactured as the main body as long as it has a structure similar to that of the attachment part 40 of the brush cutter 2.

[0063] The present invention can be realized not only as the connecting member in the above-described embodiment, but also as a rotating body set including the connecting member and a rotating body such as a turntable, or as a concrete finishing device including the connecting member, the rotating body, and a main body. The rotating body set may also include a blade holder, a replacement rotating body (turntable, rotary trowel), etc.

[0064] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the present invention. Furthermore, matters not explicitly disclosed in the above embodiments, such as the weight of the connecting member, do not deviate from the range of ordinary practice by a person skilled in the art, and values ​​that can be easily assumed by a person skilled in the art can be adopted. [Explanation of symbols]

[0065] 1, 3, 4 Connecting members 2 Brush cutters 10 Main body joint 11, 111 through holes 20, 120 Rotary joint 21 Opening 22, 112, 122a, 122b drilling holes 30 Side part 40 Mounting part 50 Blade holder 51 Convex part 61, 91 male thread 62 Female thread 70 Blade holder 80 cutting blade 81 Mounting holes 90 Turntable

Claims

1. A connecting member that connects a main body of a concrete finishing device and a rotating body, the connecting member having a structure at an end that can be joined by a screw, A connecting member comprising at least a body joint portion having a through hole at the end portion that fits into the body portion.

2. a rotating body joint portion that is parallel to the main body joint portion, has an opening at the center, and is joined to the rotating body; The connecting member according to claim 1 , further comprising a cylindrical side portion fixed to the main body joint portion and the rotary body joint portion.

3. 3. The connecting member according to claim 2, wherein the rotating body joint portion has a plurality of drill holes formed therein for joining to the rotating body with screws.

4. 2. The connecting member according to claim 1, wherein the body joint portion has a plurality of drill holes formed therein for connecting the body to the rotating body with screws.

5. 5. A connecting member according to claim 3 or 4, wherein all but one of the drilled holes have a predetermined length in the circumferential direction of the connecting member and are shaped so that a screw can be inserted by moving it in the circumferential direction.

6. A rotating body set comprising: the connecting member according to claim 1 or 2; and the rotating body.

7. 7. The rotating body set according to claim 6, wherein the rotating body is a rotating disk.

8. A rotating body set including the connecting member according to claim 3 or 4 and the rotating body, the rotating body is a rotating disk, A plurality of male screws are provided on a surface of the rotating disk that does not come into contact with concrete, The rotating body set is characterized in that the male screw is inserted into a drilled hole of the connecting member, and the rotating disk is connected to the connecting member.

9. A concrete finishing device comprising the connecting member according to any one of claims 1 to 4, the rotating body, and the main body, A concrete finishing device characterized in that the rotating body is connected to the end of the main body via the connecting member.

10. 10. The concrete finishing device according to claim 9, wherein the main body is configured so that it can be used as a brush cutter by attaching a cutting blade to the end portion.

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