Wooden wheel

Abstract

To provide a wheel capable of firmly mounting a tread material on the outer peripheral surface side of a core body, easily removing and replacing the tread material, and quickly and easily replacing the tread material with an optimum tread material (with or without a waterproof coat) according to the weather at a site outside a factory.SOLUTION: The wooden wheel (1) includes a wooden core body (2) provided with a shaft part (20), and a plurality of wooden tread materials (3) provided along a circumferential direction on an outer circumferential side of the core body (2), wherein a plurality of bolts (41) are erected in a radial direction on an outer circumferential surface of the core body (2), the tread material (3) has a through hole (30) through which the bolt (41) is inserted, and the tread material (3) is detachably attached to the outer circumferential side of the core body (2) by screwing a nut (40) to the bolt (41) penetrating a through hole (31) of the tread material (3).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to wooden wheels used on floats, such as those used in Danjiri festivals. [Background technology]

[0002] Traditionally, wooden wheels for these types of floats have been made by cutting large diameter pieces of solid wood such as pine. In recent years, it has become more difficult to obtain such wood, but the number of wheels required is increasing because the floats are pulled around roughly during festivals, which causes the wheels to wear out easily.

[0003] Under these circumstances, it has been proposed to make wheels using laminated wood instead of solid wood (see, for example, Patent Document 1). Furthermore, it has also been proposed to have a wooden core body on which an axle is provided and a plurality of wooden tread materials provided circumferentially on the outer periphery of the core body, allowing the tread material to be replaced (see, for example, Patent Document 2).

[0004] However, because the tread material is subject to strong forces from the road surface, it must be firmly fixed, and in Patent Document 2, it is firmly fixed with adhesive and wooden nails, which cannot be easily removed. The wooden nails must be removed and the adhesive must be removed by hitting it with a hammer or the like, and when installing new tread material, the outer peripheral surface of the core body must be thoroughly primed and then reattached with adhesive and wooden nails, so this reattachment work must be done in a factory, taking time and effort. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-231599 [Patent Document 2] Utility Model Registration No. 3156080 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned situation, the present invention aims to solve the problem by providing a wheel in which the tread material can be firmly attached to the outer peripheral surface of the core body, and can be easily removed and replaced, and in which the tread material can be quickly and easily replaced with the most suitable tread material (with or without a waterproof coating, for example) depending on the weather, for example, at a site outside the factory. [Means for solving the problem]

[0007] The present invention includes the following inventions. (1) A wooden wheel comprising a wooden core body on which an axle portion is provided, and a plurality of wooden tread materials provided along the circumferential direction on the outer periphery of the core body, wherein a plurality of bolts are provided radially on the outer periphery of the core body, the tread material has through holes for inserting the bolts, and nuts are threaded onto the bolts that pass through the through holes of the tread material, thereby detachably attaching the tread material to the outer periphery of the core body.

[0008] (2) A wooden wheel according to (1), wherein the core body is formed by coaxially assembling a plurality of wooden flat pillars, and a plurality of radially arranged grooves for holding the base end side of the bolt are formed on the assembly surface of the flat pillars, and the bolt is sandwiched between the flat pillars with its base end side fitted into the groove of the flat pillars.

[0009] (3) A wooden wheel as described in (2), in which an annular engagement groove is formed on the assembly surface of the flat columnar body so as to communicate with the center end of each groove, and in which the head of a bolt inserted into each groove is locked so as not to move in the bolt axial direction.

[0010] (4) A wooden wheel as described in (1), wherein the outer peripheral surface of the core body is an uneven surface whose outer diameter changes along the axial direction, and the inner surface of the tread material facing the outer peripheral surface is provided with uneven portions that fit into the uneven surface, the bolts are erected in small-diameter areas that constitute the uneven surface of the core body, and the through holes for inserting the bolts are formed in the convex portions that constitute the uneven portion of the tread material.

[0011] (5) A wooden wheel as described in (4), wherein the uneven surface on the outer peripheral surface of the core body has areas at both axial ends and in the central area that are larger in diameter than the small-diameter area therebetween, the uneven portion of the tread material has two protrusions that fit into the small-diameter areas and a recess between them, the bolts are erected in the small-diameter areas of the core body, and the through holes for inserting the bolts are formed in the two protrusions of the tread material.

[0012] (6) The wooden wheel according to (1), wherein an elastic member is interposed between the core body and the tread material.

[0013] (7) A wooden wheel according to (6), wherein the elastic member is an elastic sheet interposed between the core body and the opposing surfaces of the tread material that intersect with the radial direction. [Effects of the Invention]

[0014] According to the present invention, the tread material can be firmly fixed with bolts and nuts installed radially on the outer peripheral surface of the core body, eliminating the need for adhesives. It can be easily removed on-site and quickly and easily replaced with the optimal tread material (with or without a waterproof coating, for example) depending on the weather. In other words, the present invention allows for easy on-site replacement of the tread material by simply loosening the nuts. Simply replacing damaged tread material allows the core body and other tread materials to continue being used, thereby extending their lifespan. It also makes it easy to prepare multiple types of tread material suited to different road surfaces and weather conditions and replace them with the optimal tread material at the last moment.

[0015] Here, the core body is constructed by coaxially assembling a plurality of wooden flat pillars, and a plurality of grooves that hold the base end of the bolt are formed radially on the assembly surface of the flat pillars, and the bolt is sandwiched between the flat pillars with its base end fitted into the grooves of the flat pillars.In this case, the bolt can be set upright more firmly and securely, and the tread material can be held in a stable position even when subjected to strong force from the road surface.

[0016] Furthermore, if the assembly surface of the flat column is provided with an annular engagement groove that is formed in communication with the central end of each groove and that locks the head of the bolt inserted into each groove so that it cannot move in the axial direction of the bolt, the bolt can be firmly fixed without coming loose, the protruding length of the bolt can be maintained constant, and workability during manufacturing is also good.

[0017] In a tire where the outer peripheral surface of the core body is an uneven surface whose outer diameter changes along the axial direction, the tread material has an inner surface facing the outer peripheral surface that is provided with uneven portions that fit onto the uneven surface, the bolts are erected in small-diameter regions that make up the uneven surface of the core body, and the through-holes for inserting the bolts are formed in convex portions that make up the uneven portion of the tread material, even if a large force acts from the road surface when turning, the force can be absorbed by the engagement between the uneven surface and the uneven portions, thereby preventing the bolts from being damaged by the large force applied to them or the tread material from peeling off. Also, by erecting the bolts in the small-diameter regions, the bolts can be passed through a longer distance into the tread material, ensuring a large contact area, maintaining a stable posture, and preventing damage to the through-holes in the tread material.

[0018] Furthermore, if the uneven surface on the outer peripheral surface of the core body has areas at both axial ends and the central area that are larger in diameter than the small-diameter area between them, the uneven portion of the tread material has two convex portions that fit into the small-diameter areas and a concave portion between them, the bolts are erected in the small-diameter areas of the core body, and the two convex portions of the tread material have through holes for inserting the bolts, it is possible to more reliably prevent large forces from being applied to the bolts, and even if the tread material dries, shrinks, and deforms, causing it to rattle, it is possible to more reliably maintain a stable posture without the bolts coming off.

[0019] Furthermore, in tires in which an elastic member is interposed between the core body and the tread material, when each tread material receives force from the road surface, it can move closer to the outer circumferential surface of the core body along the bolt axis while compressing the elastic member, thereby efficiently absorbing the impact that the wheel receives from the road surface through each tread material, improving ride comfort. Also, because the elastic member absorbs the impact when the brake rod and tread material collide, the brake rod is less likely to bounce off, improving braking performance. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view of a wooden wheel according to an exemplary embodiment of the present invention; [Figure 2] FIG. [Figure 3] A cross-sectional view of the wheel cut at a plane perpendicular to the axial direction. [Figure 4] This is a cross-sectional view of the wheel cut along a plane parallel to the axial direction. [Figure 5] FIG. [Figure 6] 1(a) and 1(b) are perspective views showing the flattened columnar body that constitutes the core body. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a partially exploded perspective view showing a state in which an elastic member is attached to a core body. [Figure 10]FIG. 4 is a perspective view showing a tread material through which a bolt is inserted. [Figure 11] (a) is a side view of the tread material seen from the circumferential direction, and (b) is a side view seen from the end in the axial direction. [Figure 12] FIG. 10 is a perspective view showing a tread material without a bolt inserted therethrough. [Figure 13] (a) is a side view of the tread material seen from the circumferential direction, and (b) is a side view seen from the end in the axial direction. [Figure 14] 10(a) and 10(b) are explanatory diagrams showing modified examples of the tread material. DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0022] As shown in Figures 1 to 4, the wooden wheel 1 of the present invention comprises a wooden core body 2 on which an axle portion 20 is provided, and a plurality of wooden tread materials 3 provided circumferentially on the outer periphery of the core body 2. A plurality of bolts 41 are provided radially upright on the outer periphery 2a of the core body 2, and nuts 40 are threaded onto the bolts 41 that pass through the through holes 30 of the tread material 3, thereby detachably attaching the tread material 3 to the outer periphery of the core body 2.

[0023] Such a wheel 1 allows for easy replacement of only the tread material 3, which wears due to friction with the road surface, reducing the frequency of replacement of the entire wheel and contributing to cost reduction.In addition, since the tread material 3 can be attached with bolts and nuts so that it can move relatively in the radial direction, it is also possible to improve ride comfort by interposing other members, such as elastic members, between the tread material 3 and the core body 3.

[0024] Pine or other wood materials traditionally used for the wheels of local floats can be used for the core body 2 and tread material 3. The bolts 41 and nuts 40 can also be made of various materials other than metal, such as synthetic resin, carbon, or wood.

[0025] All of the tread materials 3 may have through holes for inserting the bolts 41, but as can be seen from Fig. 3, the tread materials 3 of this embodiment are a mixture of those (3A) that have through holes 30 for inserting the bolts 41 and those (3B) that do not. In other words, the tread materials 3 that have through holes 30 for inserting the bolts 41 are provided only on some of the tread materials 3A, and the other tread materials 3B are supported on the outer peripheral surface 2a of the core body 2 by the tread materials 3A by engaging with the some of the tread materials 3A attached to the outer peripheral surface 2a of the core body 2 with the bolts 41 so as not to move in the radial direction.

[0026] More specifically, as shown in Figures 10 and 11, the tread material 3A is a wooden member having a length in the longitudinal direction that is the same as the axial length of the outer peripheral surface 2a of the core body 2, i.e., the width of the wheel 1, and having an inner surface 3b facing the outer peripheral surface 2a of the core body 2, an outer surface 3a consisting of a curved surface on the opposite side of the inner surface 3b that becomes the contact surface of the wheel, both end surfaces 3c and 3d in the longitudinal direction, and both side surfaces 3e and 3f facing the circumferential direction of the wheel 1 that become the opposing surfaces of adjacent tread materials.

[0027] The outer peripheral surface 2a of the core body 2 to which the tread material 3A is attached is an uneven surface whose outer diameter changes along the axial direction as shown in Figure 4, and the inner surface 3b of the tread material 3A facing the outer peripheral surface 2a is provided with an uneven portion 31 that fits into the uneven surface. This stabilizes the position of the float in the axial direction, where a strong force acts from the road surface, particularly when changing direction, and further ensures stable holding even if the tread material dries, shrinks, and deforms, causing it to become loose.

[0028] More specifically, the uneven surface of the outer peripheral surface 2a of the core body 2 has, as a surface extending in the circumferential direction, regions R1 and R5 at both axial end portions and a central region R3, regions that are larger in diameter than the small-diameter regions R2 and R4 between them, and the rest has connecting surfaces that extend in the radial direction connecting these regions.In contrast, the uneven portion 31 of the tread material 3A has two protruding portions 311, 311 that fit into the small-diameter regions R2 and R4, a recessed portion 312 between them, and open, notched recessed portions 310, 310 on both outer side sides of the protruding portions.

[0029] The structure of the tread material 3A described above is similar to that of the tread material 3B, and the same structures are denoted by the same reference numerals and will not be described again, as shown in Figures 12 and 13. The tread materials 3A and 3B differ in the structures of the side surfaces 3e and 3f, and also in the presence or absence of through holes 30 through which the bolts 41 are inserted.

[0030] The bolts 41 that detachably attach the tread material 3A are erected in the small-diameter regions R2 and R4 of the core body 2, and the tread material 3A corresponding to these bolts has through-holes 30 formed in two protrusions 311, 311, through which the bolts 41 are inserted. As a result, the bolts can be passed through the tread material over a long distance, and the contact area increases, resulting in a structure that can maintain a stable posture.

[0031] On the outer surface 3a side of the through hole 30, there is provided a mounting hole 32, which is formed coaxially with and continuous with the through hole 30, has a larger diameter than the through hole 30, opens to the outer surface 3a, and is used to insert a nut to be threaded onto a bolt 41. With the bolt 41 inserted into the through hole 30 of the tread material 3A and the tread material 3A positioned on the outer peripheral surface 2a, a nut 40 is inserted through the mounting hole 32 and threaded onto the bolt 41, whereby a step surface 33 between the through hole 30 and the mounting hole 32 serves as a seating surface for the nut 40, and the tread material 3A is removably fixed to the outer peripheral surface 2a. After fixing, a wooden plug 42 is inserted into the mounting hole 32 to prevent dust and the like from entering and making it difficult to fix or remove the tread material 3A.

[0032] The sides 3e, 3f of the tread material 3A and the corresponding sides 3f, 3e of the tread material 3B are each provided with a hooking structure that hooks the sides 3f, 3e of the tread material 3B onto the sides 3e, 3f of the tread material 3A so that they cannot move toward the outer surface 3a. Specifically, notched surfaces 34 that are continuous with the inner surface 3b are formed on the side surfaces 3e, 3f of the tread material 3A that are fixed by the bolts 41, and bulging surfaces 35 that fit into the notched surfaces 34 are formed at corresponding positions on the side surfaces 3f, 3e of the tread material 3B that face these. As a result, the bulging surfaces 35 engage with the notched surfaces 34, and the tread material 3B is held on the outer peripheral surface 2a so as to be locked against relative movement toward the outer surface 3a.

[0033] In this way, by providing through holes 30 for inserting bolts 41 only in some of the tread materials 3A and configuring the remaining tread materials 3B to be held by the tread materials 3A, the number of bolts 41 used can be reduced, which also reduces the overall weight. Of course, it is also possible to provide through holes 30 in all of the tread materials 3 and attach all of the tread materials 3 with bolts 41. In this embodiment, the number of tread materials 3A that have through holes 30 for inserting bolts 41 and the number of tread materials 3B that do not have through holes 30 are the same, and the tread materials 3A and 3B are arranged alternately in the circumferential direction, so that the tread material 3B can be stably engaged and supported by the tread materials 3A on both sides.

[0034] In this example, one tread material 3B is sandwiched between tread materials 3A for engagement and support, but as shown in Figure 14, two or more tread materials 3B, 3C can also be sandwiched and engaged for support. This allows for a further reduction in the number of tread materials 3A, which in turn reduces the number of bolts 41 used and enables a further reduction in total weight. In this case, stable support can be maintained by engaging adjacent tread materials 3B with each other.

[0035] In this embodiment, the tread material 3 is detachably connected around the entire outer peripheral surface 2a of the core body 2, but it is not necessary for all of the tread materials 3 to be detachably attached, and some of the tread materials may be fixed with an adhesive or the like so that they cannot be easily detached. In this case, it is preferable to directly adhere the tread material to the outer peripheral surface 2a without interposing an elastic member 5, which will be described later. Also, some of the tread materials may be omitted, and instead a tread portion may be integrally provided to protrude from the outer peripheral surface 2a of the core body 2.

[0036] The tread material 3 is made of wood that has been dried in advance to prevent cracking, but if the road surface is wet or it rains and the wood absorbs moisture, it expands, making it less flexible and causing rapid wear. Therefore, it is preferable that the tread material 3 be waterproof coated by coating or impregnating it with a waterproofing agent. It is also possible to prepare tread material with a waterproof coating in advance and then switch from tread material without a waterproof coating to tread material with a waterproof coating as needed depending on the weather forecast and the weather of the day.

[0037] 4 to 8, the core body 2 is configured by coaxially assembling a plurality of wooden flat columnar bodies 21A, 22A, 22B, and 21B. A plurality of recessed grooves 211 / 221 for holding the base end side of the bolt 41 are formed radially on the assembly surfaces 210 / 220 of the flat columnar bodies 21A, 22A, 22B, and 21B.

[0038] The bolt 41 is sandwiched between the flat columnar bodies 21A, 22A (22B, 21B) with its base end fitted into the recessed grooves 211, 221 of the flat columnar bodies 21A, 22A (22B, 21B). In addition, the assembly surfaces 210 / 220 of the flat columnar bodies 21A, 22A, 22B, 21B are provided with annular engagement grooves 212 / 222 which are formed in communication with the center-side ends of the recessed grooves 211 / 221 and in which the head 410 of the bolt inserted into each recessed groove 211 / 221 is locked so as not to move in the bolt axial direction.

[0039] In this way, by forming grooves for holding bolts 41 in the assembly surfaces 210 and 220 and sandwiching the bolts between the assembly surfaces, it becomes possible to assemble bolts 41 without dividing the core body 2 in the circumferential direction. Therefore, it is possible to maintain the strength of the core body 2 in the direction perpendicular to its axis, and also to easily assemble bolts 41.

[0040] In this embodiment, grooves 211, 221 are provided on the assembly surfaces 210, 220 of the flat columnar bodies 21A, 22A to be joined together, respectively, and the bolt 41 is sandwiched between the grooves 211, 221. However, it is also possible to provide a groove on only one of the assembly surfaces 210, 220, and sandwich the bolt 41 between the groove and the flat surface or convex portion of the other. The same applies to the assembly surfaces 210, 220 of the flat columnar bodies 21B, 22B.

[0041] Alternatively, the bolt 41 may be one without a head, with a nut or double nut provided in place of the head, and similarly engaged in the engagement groove 212 / 222. The engagement groove 212 / 222 is formed in an annular shape around the entire circumference, but it may also be provided intermittently only at positions corresponding to the positions of each bolt. In this example, a hexagonal head bolt is shown, but other bolts such as square head bolts may also be used. A headless bolt may be used, omitting the engagement groove 212 / 222, and instead fixing the end corresponding to the head with adhesive or the like.

[0042] As in this embodiment, bolts 41 are erected at positions between the flat columnar bodies 21A, 22A and between the flat columnar bodies 22B, 21B on both ends of the axial center, and one tread material 3A can be fixed in a stable position with a total of two bolts 41 positioned apart on both axial ends. No bolts are attached to the assembly surface between the flat columnar bodies 22A, 22B, but it is also possible to attach them in a similar manner and fix one tread material with three bolts.

[0043] It is preferable that at least a portion of the axial region of the outer peripheral surface 2a of the core body 2 has an outer peripheral surface that is polygonal in cross section, with a plurality of flat surfaces formed corresponding to the opposing tread materials 3 being connected all around. This allows the tread materials to be held in a stable position on the outer peripheral surface 2a of the core body 2 without shifting in the circumferential direction, for example, when braking the wheel. In this embodiment, the above-mentioned small-diameter regions R2, R4 and central region R3 of the outer peripheral surface 2a of the core body 2 have an outer peripheral surface that is polygonal in cross section (24-sided in this example) with flat surfaces 25 that face the tread materials 3A, 3B lined up in the circumferential direction in the same number as the number of tread materials.

[0044] In this embodiment, the structure is formed by assembling four flat cylinders 21A, 22A, 22B, and 21B, but the number is not particularly limited, and for example, two flat cylinders may be combined with a bolt attached between them, or instead of forming the flat cylinders 22A and 22B from a combination of two parts, these may be integrated into one flat cylinder, or five or more flat cylinders may be assembled together.

[0045] Reference numeral 23 denotes a plurality of dowel holes provided at positions between the recessed grooves 211 (221) for inserting and clamping the bolts 41, and reference numeral 24 denotes dowels that are inserted by applying adhesive to the dowel holes 23. By firmly adhering the assembly surfaces between the recessed grooves 211 (221) with the dowels 24 in this way, the bolts 41 can be held firmly and stably.

[0046] An elastic member 5 is interposed between the core body 2 and the tread material 3. As a result, although the tread materials 3 (3A, 3B) are constrained with respect to the core body 2 by the bolts 41 and nuts 40, they are able to move relatively in the radial direction of the wheel along the axis of the bolts 41 by the amount of elastic compression of the elastic members 5. As described above, the bolts 41 are firmly fixed in the radial direction by the recessed grooves 211 / 221 and the engaging grooves 212 / 222, and therefore the relative movement of each tread material 3 in the radial direction can be supported and guided in a stable posture.

[0047] In this way, when pressure is applied from the road surface, each tread material 3 can move closer to the outer peripheral surface 2a of the core body 2 while compressing the elastic members 5, thereby enabling the wheel 1 to efficiently absorb the impact from the road surface through each tread material 3. In terms of ride comfort, it is effective to use a wheel 1 to which each tread material 3 is attached via such elastic members 5 as a wheel in the front where passengers ride, i.e., a front wheel.

[0048] In addition, particularly with front wheels, a brake rod may be inserted when braking, but if the wheel's contact surface is hard, the brake rod will bounce off and the brakes will not work easily. However, by using wheels 1 with the above-mentioned elastic member 5 installed on the front wheels, the impact when the brake rod collides with the tread material 3 is absorbed by the elastic member 5, making it less likely that the brake rod will bounce off, and improving braking performance.

[0049] The elastic member 5 is an elastic sheet interposed between the opposing surfaces of the core body 2 and the tread material 3 that intersect in the radial direction, and is provided on the entire opposing surface between the outer peripheral surface 2a of the core body 2 and the inner surface 3b of the tread material 3. Various materials such as natural rubber, synthetic rubber, and elastomer can be used as the material for the elastic sheet.

[0050] When such elastic members 5 are installed, although the bolts 41 are firmly fixed, the tread material 3 is more likely to become unstable than when it is in direct contact with the outer peripheral surface 2a of the core body 2. In particular, when changing the direction of the platform, the wheel is forced to slide to change direction, and at this time, a strong force acts in the axial direction of the wheel on the contact surface of the wheel, in this case the tread material 3, and it becomes difficult to maintain a stable position if the bolts 41 are used alone to support the wheel, unless the bolts are made very strong. In this example, the outer peripheral surface 2a of the core body 2 is an uneven surface whose outer diameter changes along the axial direction, and the inner surface 3b of the tread material 3 is provided with uneven portions 31 that fit into this uneven surface, so that a stable position can be maintained without any problems even when the above-mentioned strong force is applied.

[0051] 7, in the uneven surface of the outer peripheral surface 2a of the core body 2, a single long rubber sheet 50 is wrapped around each of the regions R1 and R5 which are circular in cross section and fixed with nails or the like, and in the regions R2 to R4 which are 24-sided in cross section, one rubber sheet piece 51 is prepared for each flat surface 25 and fixed with nails or the like. For the flat surface 25 from which the bolt 41 protrudes, a rubber sheet piece 51 having a through hole 51a formed in advance for the bolt 41 to pass through is used.

[0052] The shaft portion 20 comprises an axial hole 2c drilled in the central shaft portion of the core body 2, and a metal bearing member 6 is inserted into the shaft portion 20. As shown in Figure 2, the bearing member 6 constituting the shaft portion 20 integrally comprises a sleeve 60 fitted into the axial hole 2c and a flange 61 fixed to the side surface of the core body 2 with a screw, and has a bearing hole 6a in the center that passes through the flange 61 and the sleeve 60. The structure of the shaft portion 20 is not limited to this example, and a wide variety of known bearing members can be used in addition to those used in this example.

[0053] Although the embodiments of the present invention have been described above, the present invention is not limited to these examples, and it goes without saying that the present invention can be embodied in various forms without departing from the spirit of the present invention. [Explanation of symbols]

[0054] 1 wheel 2 Core body 2a Outer surface 2c shaft hole 3A, 3B, 3C tread material 3a Exterior 3b Inner surface 3c, 3d end face 3e, 3f side 5 Elastic member 6 Bearing materials 6a Bearing hole 20 Shaft 21A, 22A flat columnar body 21B, 22B squamous columnar body 23 Dowel holes 24 Dowel 25 flat surface 30 through hole 31 Uneven part 32 mounting holes 33 Step surface 34 Notched surface 35 Bulging surface 40 nuts 41 volts 42 Wood plug 50 rubber sheets 51 Rubber sheet piece 51a Through hole 60 sleeves 61 flange 210, 220 assembly surface 211,221 groove 212, 222 engagement groove 310 Recess 311 Convex part 312 recess 410 Head R1~R5 area

Claims

1. a wooden core body on which a shaft portion is provided; A wooden wheel having a plurality of wooden tread materials provided along a circumferential direction on an outer circumferential side of the core body, A plurality of bolts are provided radially on the outer peripheral surface of the core body, the tread material has a through-hole through which the bolt is inserted, The wooden wheel has a tread material detachably attached to the outer periphery of the core body by threading nuts onto the bolts that pass through the through holes of the tread material.

2. The core body is configured by assembling a plurality of wooden flat pillars coaxially, A plurality of recessed grooves for holding the base end side of the bolt are formed radially on the assembly surface of the flat columnar body, The bolt is sandwiched between the flat columnar bodies with the base end side fitted into the recessed groove of the flat columnar body.

2. The wooden wheel of claim 1.

3. An annular engagement groove is formed on the assembly surface of the flat column body so as to communicate with the end of each groove on the center side, and the head of a bolt inserted into each groove is locked so as not to move in the bolt axial direction.

3. The wooden wheel of claim 2.

4. The outer peripheral surface of the core body is an uneven surface whose outer diameter changes along the axial direction, an uneven portion that fits into the uneven surface is provided on an inner surface side of the tread material that faces the outer peripheral surface, The bolt is provided upright in a small diameter region that constitutes the concave-convex surface of the core body, The through-hole through which the bolt is inserted is formed in a convex portion constituting the uneven portion of the tread material.

2. The wooden wheel of claim 1.

5. the concave-convex surface of the outer peripheral surface of the core body has regions at both axial ends and a central region, the regions having a larger diameter than a small-diameter region therebetween, the uneven portion of the tread material has two protruding portions that fit into the small diameter region and a recessed portion therebetween, The bolts are provided upright in the small diameter regions of the core body, the through-holes through which the bolts are inserted are formed in the two protruding portions of the tread material; 5. The wooden wheel of claim 4.

6. An elastic member is interposed between the core body and the tread material.

2. The wooden wheel of claim 1.

7. the elastic member is an elastic sheet interposed between the core body and an opposing surface of the tread material that intersects with the radial direction, 7. The wooden wheel of claim 6.

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