JP2013154844A - Wooden wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a conventional wooden wheel formed of the laminate lumber of single boards that uneven wear arises since many single boards are exposed to its tread, and stable travelling becomes impossible after long traveling.SOLUTION: A wooden wheel has a body where layers (laminated plates) composed of a plurality of single boards are laminated and joined, and a tread which is formed at an equal distance from the center of the body. The body is formed of an uppermost layer, a lowermost layer, and an intermediate which is sandwiched between the uppermost layer and the lowermost layer and composed of a plurality of intermediate layers where the direction of its lamination is the vertical direction. The uppermost layer and the lowermost layer are thicker than the thickness of each intermediate layer which constitutes an intermediate part. The wooden wheel allows stable traveling even after long traveling because uneven wear is hardly generated since the tread is worn away uniformly.

Description

  The present invention relates to wooden wheels used for floats dedicated at festivals represented by Danjiri, and more particularly to wooden wheels for ground vehicles.

  Floats are known as offerings for festivals. In particular, those with a gable roof and decorated with sculptures are called local cars, and local cars used in the “Danjiri Festival” in Kishiwada City, Osaka Prefecture are famous. This ground car still uses a lot of wooden parts basically from the meaning of dedication to the festival, and wooden wheels are used. Such a wheel is usually called “frame”.

  Since the total weight of the ground vehicle reaches several tons, the top must be strong. Therefore, the conventional top was manufactured by cutting out from a single material. Specifically, solid wood obtained from raw wood with a thickness that can cut out a piece with a predetermined diameter is cut into a ring, a bearing is provided at the center, and a ground contact surface is formed so as to be equidistant from the center of the bearing It was processed into a wheel shape.

  However, in recent years it has become difficult to obtain raw wood from which solid wood can be taken to cut out the tops. For example, the diameter of a local frame used in the “Danjiri Festival” in Kishiwada City, Osaka Prefecture is about 70 cm or less. Therefore, in order to produce a top by cutting, a log having a diameter larger than that is necessary, but it is more than 400 years old. The number of such trees is decreasing year by year. Therefore, it has been proposed to collect small pieces of wood to make laminated wood and to produce wheels with it.

  Patent Document 1 discloses a polymerization type wooden wheel characterized in that, when collecting wood and forming a wooden wheel, the bark appearing on the outer peripheral surface is perpendicular to the grain. FIG. 6 shows the appearance of this wheel from the side. The superposition type wooden wheel 100 is comprised from the ring materials 101, 102a, 102b, 105a, 105b. Each ring material has a mortise applied to the joining portion to increase the joining force. Moreover, the grain of each ring material is represented by reference numerals 111, 112a, 112b, 115a, 115b.

  When the joints 110 of the wood to be used are placed horizontally, the wood 115a, 115b used for the upper and lower ends (the rings 105a, 105b) is the wood used between them (the rings 101, 102a). , 102b) and cut out to be perpendicular to the grain (111, 112a, 112b). An arrow 130 in FIG. 6 represents the vertical direction.

  By doing so, the grain forming the outer peripheral surface of the ground contact surface 120 becomes perpendicular to the ground and has a significant resistance to abrasion. In addition, since there is no seam line parallel to the rotation direction of the wheel on the ground contact surface 120, it is said that there is an effect that the earth and sand do not fit into the seam and are not torn off.

  In patent document 2, the wooden wheel of the shape similar to the wheel of a motor vehicle is disclosed. FIG. 7 shows this wooden wheel. In the wooden wheel 200, a portion corresponding to the wheel (core member 203) is formed by cutting out a disc-like one to which a wooden board material is bonded, and overlapping the discs. Further, a portion corresponding to the tire (tread member 204) is formed by arranging and bonding strip-shaped pieces of wood 209 in the axial direction of the core member 203.

  Patent Document 3 is a wheel obtained by collecting and fixing a single plate having a rectangular cross section, and then machining it into a cylindrical wheel shape.

Japanese Utility Model Publication No. 16-19446 Utility Model No. 3156080 JP 2006-231599 A (Patent No. 4231487)

  The ground vehicle has no vibration absorbing means such as a suspension or rubber tire. Therefore, the contact state between the top and the ground is directly transmitted to the ground vehicle itself. Therefore, when uneven wear occurs on the top, there is a problem that the ground vehicle vibrates greatly when traveling. In addition, when the tops are unevenly worn, the straightness of the ground vehicle itself is lost, and there is a high risk that the steering control cannot be performed when the traveling speed increases.

  In patent document 1, although the point which strengthens the resistance with respect to the abrasion of the ground-contact surface of a wheel is considered, the point which a wheel wears unevenly is not considered. In addition, when the stacking direction of the ring material is set to the vertical direction (reference numeral 130 in FIG. 6), the wood grain (115a, 115b) corresponding to the upper and lower ends is made perpendicular to the ground. This means that the ground contact surface 120 is formed with a small edge surface. Here, the facet means a surface cut in a direction crossing the wood direction of the lumber (longitudinal direction of the raw wood).

  In this way, if the ground contact surface is configured to have a small edge surface, it is surely strong against abrasion, but on the contrary, it is difficult to wear, and therefore, uneven wear tends to occur. This is because chipping is likely to occur at the portion of the ground contact surface 120 of the wheel when the small edge surface is grounded. In addition, at least a wood having the width of the rings (105a, 105b) corresponding to the upper and lower ends (reference numeral 105w in FIG. 6) is required, and the problem that it is difficult to obtain a thick raw wood in recent years cannot be solved. Moreover, even if a thick log is available and a ring having a sufficient width is obtained, the thick ring has a problem that it is likely to be cracked.

  Patent Document 2 describes that when uneven wear occurs, the straight movement of the dipper is lost and a safety problem occurs. However, as a countermeasure, it is characterized in that the worn part can be easily repaired. That is, the core member 203 and the tread member 204 are configured as separate members, and when the tread member 204 is worn or unevenly worn, the core member 203 remains unchanged and only the tread member 204 is replaced.

  That is, Patent Document 2 does not consider the point of suppressing uneven wear. Therefore, when the ground vehicle is run continuously for a long time, there is still a problem that the straightness of the ground vehicle becomes unstable due to uneven wear unless the frames are replaced.

  In Patent Document 3, there is a description that a non-small edge surface is arranged on the ground contact surface of a wheel because a chip occurs on the ground contact surface when there is a small edge surface. However, even in Patent Document 3, no consideration is given to how to deal with the point of uneven wear of the top.

  In view of the above problems, the inventor of the present invention, in order to make it difficult for uneven wear to occur especially on a wooden wheel, it is important that the entire circumference of the frame is worn relatively uniformly. A certain point was conceived and the present invention was completed.

More specifically,
A wooden wheel having a main body formed by laminating and joining a plurality of single-plate layers (layer board), and a ground plane formed at an equal distance from the center of the main body,
When the main body has the stacking direction as a vertical direction,
The top layer, the bottom layer,
It is sandwiched between the uppermost layer and the lowermost layer, and is formed from an intermediate portion consisting of a plurality of intermediate layers,
The uppermost layer and the lowermost layer are wooden wheels characterized by being thicker than the thickness of the intermediate layer constituting the intermediate portion.

  In the wooden wheel, the uppermost layer and the lowermost layer are configured by sandwiching a vertically long piece of a cross section with a pair of cross-sectional sector pieces. In the wooden wheel, there are four longitudinal pieces.

  In the wooden wheel, the uppermost layer and the lowermost layer have a thickness of 1.5 to 3.5 times the thickness of the intermediate layer. In the wooden wheel, the ground contact surface may be formed by a mesh or a memorial mesh. Further, the above-described wooden wheel has a side plate on at least one side surface of the main body.

  Since the present invention has the above-described configuration, the coma wears relatively uniformly over the entire circumference. For this reason, even if the ground vehicle travels continuously for a long time, there is no adverse effect such as strong vibration or loss of straightness.

  In addition, since the top according to the present invention can be composed of only a single plate cut out from a relatively small diameter wood, material procurement is possible regardless of the thickness of the original wood.

  In addition, the use of a relatively small veneer can sufficiently dry each veneer, and thus there is no possibility that the completed frame will crack.

  In addition, the use of a plurality of veneers increases the possibility of using a material made of a plurality of raw timbers and absorbs variations in mechanical properties due to the individual timbers of the individual veneers. Moreover, even if it is the single board cut out from the same raw wood, the dispersion | variation in the mechanical strength resulting from the difference in the cut-out place is also absorbed. Therefore, when a plurality of frames are produced, it is possible to reduce the variation in strength between individual frames. That is, a high strength frame can be manufactured stably.

It is a perspective view which shows the external appearance of the wooden wheel which concerns on this invention. It is a figure explaining a single plate and a layer board. It is a figure which shows the outermost layer. It is a figure which shows the state which comprised the laminated material before carving out a wooden wheel. It is a figure which shows the position of a volt | bolt. It is a figure which shows the structure of the conventional wooden wheel. It is a figure which shows the structure of the conventional wooden wheel.

  The present invention will be described below with reference to the drawings. However, the following description will describe one embodiment of the present invention, and the present invention is not limited to the following embodiment. The following embodiments can be modified without departing from the spirit of the present invention.

  FIG. 1 shows a perspective view of a wooden wheel of the present invention (hereinafter also referred to as “frame”). Referring to FIG. 1, a wooden wheel 1 according to the present invention includes a main body 2 and a ground plane 3. The main body is composed of a plurality of layers 11. A shaft hole 6 is formed in the center of the side surface 4 of the main body. The grounding surface 3 is formed at a position equidistant from the center of the shaft hole 6. When the layers 11 of the main body 2 are horizontal, the stacking direction 9 of the layers 11 is the vertical direction. In the following description of the frames, the description will be made with the stacking direction 9 set as the vertical direction. A direction parallel to each layer 11 is defined as a width direction 8 and a ground contact surface width is defined as 3w. Some of the grain is omitted. The same applies to the subsequent drawings.

  The wooden wheel 1 according to the present invention has three parts of an uppermost layer 21u, a lowermost layer 21d, and an intermediate part 22 with the stacking direction 9 as a vertical direction. The intermediate part 22 is configured by laminating a plurality of intermediate layers 23. A single plate 10 constituting the intermediate layer 23 is shown in FIG. The single plate 10 constituting the intermediate layer 23 is a single plate formed into a rectangular shape having a width of 10 w, a length of 10 L, and a thickness of 10 t. The surface 10a is a part which forms the side surface 4 (refer FIG. 1) of the wooden wheel 1. FIG. The surface 10b is a joining surface when joining with the other single plate 10 within one layer. Further, the surface 10c and the surface 10d serve as a bonding surface when the other layer 11 is laminated.

  One intermediate layer 23 is configured by arranging a plurality of single plates 10. The plurality of single plates 10 are joined to each other by the surfaces 10b. Since the bonded single plates 10 form one intermediate layer 23, it is desirable that the single plates 10 are firmly bonded to each other. For example, as shown in FIG. 2B, a joint portion 11j may be provided on each joint surface. A plate-like plate that can be formed by joining a plurality of single plates 10 together to form one intermediate layer 23 is called a layer plate 14.

  The surface of the layer plate 14 constituting one intermediate layer 23 is preferably flush. In other words, it is preferable that all the single plates 10 constituting the layer plate 14 have the same thickness 10t. This is because if there is a portion having a different thickness 10t in one intermediate layer 23, a gap is likely to occur between the layer 11 to be laminated next. The wooden wheel 1 must secure the strength to support the weight of the ground vehicle by strengthening the adhesion of the layers 11.

  Therefore, when collecting the single plate 10 and making it a laminated material, it is for making a gap as little as possible in the laminated material. For this purpose, after connecting the single plates 10 to form the layer plate 14, it is preferable to perform cutting so that the surface (the surface constituted by the surface 10 c and the surface 10 d of the single plate 10) is flush.

  FIG. 2C shows a layer plate 14 that joins three single plates 10x, 10y, and 10z to form one intermediate layer 23. FIG. Among the single layer plates 14, at least the single plate (in FIG. 2C, the single plate 10x and the single plate 10z) forming the ground plane 3 is a plane 14r that serves as the ground plane 3 (see FIG. 1). The arrangement of the single plates 10x and 10z is determined so that the non-small facet appears on the surface 14p. Arranging the non-small edge surface in the portion corresponding to the ground contact surface 3 means arranging the small edge surface on the side surface 4 side (surface 10za and surface 10xa, respectively) of the wooden wheel 1. As described above, when the small facet is disposed on the ground contact surface 3, the resistance to wear increases, but cracking is likely to occur. Also, since the resistance to wear is high, uneven wear tends to occur.

  Qualitatively, the reason why uneven wear tends to occur when the resistance to abrasion is high is considered to be as follows. In the case of a wooden wheel such as a frame, considering the entire circumference of the ground contact surface 3, the ease of wear (referred to as the wear rate) varies depending on the location. That is, some parts wear faster than other parts. Then, a partial wear state occurs. However, if the ground contact surface 3 as a whole is easily worn to a certain extent, a portion with a small amount of wear is subjected to a greater pressure and is immediately worn, so that the wear rate of the ground contact surface as a whole is easily maintained constant.

  On the other hand, if it is difficult for the ground contact surface 3 to be worn, pressure is applied to a portion with little wear, and more easily worn portions are worn before the same amount of wear as the other portions. That is, the state where the wear rate of a certain part is higher than that of the other part is not solved, and the uneven wear becomes larger and larger. Therefore, it is necessary that the entire ground surface 3 is resistant to wear, but uneven wear can be avoided if the ground surface 3 is easily worn to some extent.

  For the above reasons, it is desirable to provide a non-small edge surface on the ground contact surface 3. Furthermore, it is more desirable that the non-small facet is a grid. The grain is a portion where the layers of the annual rings are stacked in the thickness direction, and is strong against a compressive load in the thickness direction. However, this is because one or several layers of the annual rings on the surface may be peeled off due to repeated compressive loads. In such a state, large wear occurs locally, and uneven wear tends to occur.

  On the other hand, if the meshes are exposed on the ground contact surface 3 as non-small facets, there will be no chipping as with the small facets, and the layers of the annual rings will not be peeled off at the same time as the flat faces. Here, the mesh includes the memory. This is because, in the case of memorial eyes, there is less possibility of peeling between the layers of the annual rings as the plate eyes. In FIG. 2C, the surface 10xa of the single plate 10x is a fore edge surface. In addition, since the center of the annual ring is in the direction 13x on the surface 10xa, the surface 14r of the layer plate 14 becomes a grid. Also, for the single plate 10z, since the center of the annual ring is in the direction 13z, the surface 14p of the layer plate 14 becomes a grid surface.

  As long as the intermediate layer 23 is not exposed to the ground contact surface 3, the facet may be directed to either side. In FIG. 2C, it is a single plate 10y. This is because there is no possibility of chipping because it is not related to friction with the road surface.

  Further, the single plate (single plate 10x and 10z in FIG. 2C) exposed to the ground plane 3 in the intermediate layer 23 is at least 5% or more, preferably 10% or more, of the width 14w of the layer plate 14. Preferably it is 15% or more. In other words, the width of the single plate 10x and the single plate 10z (respectively 10xw and 10zw) should be at least 5% or more, preferably 10% or more, more preferably 15% or more of the width 14w of the layer plate 14. . The top after use forms a new ground plane 3 by re-grinding “rewinding” several times, so that the surface of the mesh can be regenerated in that case as well. This is also for securing the strength of the ground plane 3.

  FIG. 3 shows the uppermost layer 21u. The uppermost layer 21u and the lowermost layer 21d have the same configuration, except that they are upside down. Therefore, the uppermost layer 21u and the lowermost layer 21d are also called the outermost layer 21. Further, the thickness 21t of the outermost layer 21 is configured to be thicker than the thickness 10t (see FIG. 2) of the intermediate layer 23. Note that the thickness 21t of the outermost layer 21 refers to the distance that is the farthest between the joint surface 21b with the intermediate layer 23 and the grounding surface 3.

  Since the outermost layer 21 is formed of a single layer at the top of the arc, a cross-sectional sectoral piece 24 having a sectoral cross section is formed. Therefore, when the single plate 10 having the same thickness as the intermediate layer 23 is laminated and the cylindrical wheel is cut out, the corner portion 24a of the cross-sectional sector piece 24 becomes thin. In such a state, a step is likely to occur between the intermediate layer 23 adjacent to the outermost layer 21 and this causes uneven wear. Therefore, by making the thickness 21t of the outermost layer 21 thicker than the thickness 10t of the intermediate layer 23, uneven wear is less likely to occur.

  Further, when the outermost layer 21 is completed as a wheel, the pair of cross-sectional sector pieces 24 are formed so as to sandwich the cross-sectional vertical piece 25 having a vertically long cross section. The thicker the timber, the more difficult it is to dry and the greater the risk of cracking during use. Therefore, it is preferable to form a single plate having a cross section as small as possible. Therefore, the endmost layer 21 is formed by a pair of cross-sectional sector pieces 24, and the single plate of the cross-sectional vertically long piece 25 is sandwiched between the cross-sectional sector pieces 24 so that each single plate has a reduced cross-sectional area and is dried. Reduce the possibility of cracking.

  The width 25w of the vertically long piece 25 is preferably set to the same thickness as the thickness 10t of the intermediate layer 23. A plurality of vertically long pieces 25 may be arranged. This is because bringing the state of the grounding surface 3 as close as possible to the entire circumference of the grounding surface 3 is effective in reducing uneven wear. On the other hand, if the cross-section vertically long pieces 25 are arranged too much, the thickness of the corner 24b of the cross-section fan-shaped piece 24 becomes thin.

  As described above, the size of the cross-sectional sector piece 24 of the outermost layer 21 has an appropriate range. First, it is assumed that the width of the vertically long piece 25 in the cross section (here, width 25 w × 4 sheets) is formed to be about one third of the width 21 w of the outermost layer 21. According to the inventors' experiment, the thickness 21t of the outermost layer 21 is 1.5 to 3.5 times, preferably 2.0 to 3.0 times, more preferably 2.2 times the thickness of the intermediate layer 23. It is preferable to set the thickness to double to 2.7 times.

  If the thickness 21t is too thick, the risk of cracking increases. Moreover, it is because uneven wear will generate | occur | produce if it is too thin. The diameter of the wooden wheel 1 is assumed to be approximately 40 cm to 100 cm. Therefore, when the diameter of the wooden wheel 1 is smaller than 40 cm or larger than 100 cm, the above ratio changes. It should be noted that it is desirable that the portion that becomes the ground contact surface 3 of the outermost layer 21 is arranged so as to have a mesh (or a memorial mesh) as in the case of the intermediate layer 23.

  In the endmost layer 21 configured as described above, a portion having a long ground plane length 24R due to the cross-sectional sector piece 24 and a portion having a short ground plane length 25R due to the cross-sectional vertical strip 25 appear on the ground plane 3.

  FIG. 3B shows a layer plate 14 </ b> T constituting the outermost layer 21. The layer plate 14 </ b> T of the outermost layer 21 is configured by aligning and bonding a single plate 110 a serving as a cross-sectional sectoral piece 24 and a single plate 110 b serving as a cross-sectional vertically long piece 25. Between the single plates 110a and 110b and between the single plates 110b, reinforcing means such as making holes in adjacent surfaces and inserting dowels may be provided.

  In FIG. 4, the laminated material of the state which laminated | stacked the layer board 14 which comprises the intermediate | middle layer 23 demonstrated above and the layer board 14T which comprises the endmost layer 21 is shown. Layer plates 14 and 14T made of single plates joined in the width direction 8 are stacked in the stacking direction 9. An epoxy adhesive is applied between the layers so that peeling does not occur even when wet with some water. After lamination, drying is performed while applying pressure with a mechanical press. The dried laminated wood is formed with a shaft hole 6 at the center, and the periphery is cut like a two-dot chain line to form a wooden wheel 1. It is preferable that the layer plates 14 are adjusted to have substantially the same thickness, and the layer plates 14T are also adjusted to have substantially the same thickness. This is for achieving uniform wear.

  In order to bond the bonding strength of each layer more firmly, after cutting into a wheel shape, a hole penetrating the cross-sectional sector piece 24 and the intermediate layer 23 from the ground contact surface 3 may be drilled and fixed. The fixing means may be a metal bar, but a wooden bar such as a pine bar is preferably used as a nail. This is for making the material and wear characteristics of the ground contact surface 3 as uniform as possible. By taking such a fastening means, even if the adhesion between the layers is peeled off, the top is not disassembled. FIG. 5 is a view of the wooden wheel 1 as viewed from the side surface 4 and a view of the upper and lowermost end layers 21 as viewed from the vertical direction. In one layer, the boundary between the single plates is omitted.

  Here, the hole 40 is represented by a dotted line. The holes 40 are provided in the uppermost layer 21u and the lowermost layer 21d so as to be in alternate positions at portions shifted from the center of the width 3w of the ground surface 3 to the side surface side. Two holes 40 are formed on each of the uppermost layer 21u side and the lowermost layer 21d side. This is because these holes are formed to a depth of more than half of the outer diameter of the wooden wheel 1 and therefore need to be provided alternately up and down so as not to interfere with each other. Needless to say, after the pin 40 or the like is driven into the hole 40, the ground contact surface is finished again. Moreover, you may change suitably the installation location of the hole 40, the number of installation, etc. FIG.

  Referring to FIG. 1 again, a chamfering process may be performed on the boundary 5 between the ground surface 3 and the side surface 4. By forming the chamfer at the boundary 5, even when the wooden wheel 1 is inclined and comes into contact with the ground, chipping and cracking are less likely to occur.

  In the wooden wheel 1 (frame) according to the present invention configured as described above, a non-small edge surface (grid) having a ground contact surface length of 23R is exposed on the ground contact surface 3 at substantially the same pitch as the thickness 10t of the intermediate layer 23. The non-edge surface of the ground contact surface length 24R (see FIG. 3) of the cross-sectional sector piece 24 thicker than the thickness 10t of the intermediate layer 23 is exposed at four locations. Further, between the cross-section fan-shaped pieces 24, the non-edge surface of the cross-section vertical long piece 25 having the ground contact surface length 25R is exposed.

  The wooden wheel 1 of the present invention is provided with a shaft hole 6 for receiving the axle at the center of the main body 2 formed in this way. The shaft hole 6 may have a shape in which a square or round recess 6a is provided around the through hole. Currently, metal axles are used as axles. When the wooden wheel 1 is directly attached to the metal axle, the wooden wheel 1 side is worn at the contact portion. Therefore, it is for inserting the "dobi" 42 for receiving a metal axle.

  “Dobi” 42 is a cylindrical tube 42 a formed with a square or round flange 42 b. The tube 42 a is inserted into the shaft hole 6, and a flange 6 a provided on the side surface 4 of the wooden wheel 1 is flanged. 42b is fitted. Sliding between the metal axles takes place between the inner surface of this “dobi” 42. This is because wear of the shaft hole 6 of the wooden wheel 1 can be prevented, and a suitable lubricant can be used in abundant manner as long as the metal slides.

  Further, a side plate 44 may be joined to at least one side of the wooden wheel 1 as a decorative plate. The side plate 44 may use plywood. The bonding can be more firmly fixed by using an adhesive and driving wooden wedges at a plurality of locations.

  Next, the Example of the wooden wheel of this invention is shown. The wood used was a veneer cut from a plurality of logs. These veneers were used for 2 to 3 years after being dried and sufficiently dried.

  As the single plate of the vertically long piece in cross section used for the outermost layer, four sheets each having a width of about 3.3 cm, a height of about 7.6 cm, and a length of about 20 cm were used. These four single plates were arranged in the width direction, coated with adhesive on the side surfaces, and cured for 24 hours while applying a pressure of 1 ton on both side surfaces. As a result, a member having a width of about 13.2 cm, a height of about 7.6 cm, and a length of about 20 cm was obtained. Here, the length (20 cm) is the width of the ground plane.

  Next, a pair of members that are formed into a wheel shape after being formed in a wheel state are arranged on both ends of the uppermost sandwich material. Adhesive was applied between each part. Their height was about 7.6 cm and the length was about 20 cm. The bottom layer is formed by these three parts.

  On this lowermost layer, a single plate having a width of about 5 cm to 10 cm, a height of about 3.3 cm, and a length of about 20 cm is appropriately disposed. At this time, the single plate serving as the ground plane was arranged so that the ground plane had a grid. The single plates constituting one layer were joined in the width direction and then ground so that the stacked surfaces (both vertically) were flush with each other to form a layer plate. When laminating the layer plates in order, an adhesive was applied between the respective layer plates. Each layer board is an intermediate layer. A total of 16 intermediate layers were laminated to form an intermediate part.

  An uppermost layer similar to the lowermost layer was disposed above the intermediate portion. And the load of 5 tons was applied from the uppermost layer side, and it was left to stand for 24 hours, and the whole was used as the integrated laminated material. In the finished laminated material, a through hole was formed in the vicinity of the center, and a surface serving as a ground contact surface was formed by cutting processing with the through hole as a center. Also, chamfering was performed on the boundary line between the ground surface and the side surface. Thereafter, holes were drilled in the ground contact surface, and two φ24 mm pine rods were driven in each of the uppermost layer and the lowermost layer in order to fix the space between the uppermost layer and the intermediate layer.

  A square recess was formed around the central through hole. Thereafter, the ground contact surface was finished by final cutting. Finally, the diameter of the top was adjusted to 69 cm. Also, white Japanese paper was attached to the sides. The white Japanese paper is designed to emphasize that it is a sacred thing.

  In this way, a wooden wheel according to the present invention was obtained. This wooden wheel supported a ground vehicle weighing about 4 tons with four frames, and even when the ground vehicle was used for 3 days, the ground vehicle could be stably run without causing large uneven wear.

  The wooden wheel of the present invention can be used effectively as a wooden wheel of a float used for festivals such as nebuta and yam, as well as a ground car used for the Danjiri Festival in Kishiwada City, Osaka.

DESCRIPTION OF SYMBOLS 1 Wooden wheel 2 Main body 3 Grounding surface 3w Grounding surface width 4 Side surface 5 Boundary of side surface and grounding surface 6 Axle hole 6a Recess 8 Width direction 9 Stacking direction 10, 10x, 10y, 10z Single plate 10a Surface which becomes side surface of wooden wheel 10b 10c, 10d Surfaces joined to adjacent single plates or free surfaces 10w Surfaces joined to upper and lower layers 10w (Single plate) Width 10t (Single plate) Thickness 10L (Single plate) Length 11 Layer 11j Joint portion 14, 14T Laminate plate 21 Endmost layer 21b Joint surface (with intermediate layer) 21u Uppermost layer 21d Lowermost layer 22 Intermediate portion 23 Intermediate layer 23R Intermediate layer ground plane length 24 Cross sectional sector piece 24R Cross sectional sector piece ground plane length 25 Longitudinal section 25R Grounding section length of section longitudinal section 40 hole 42 side 44 side plate

Claims (6)

A wooden wheel having a grounding surface formed at an equal distance from the center of the main body, and a main body formed by laminating and joining a plurality of laminar plates made of a single plate,
When the main body has the stacking direction as a vertical direction,
The top layer, the bottom layer,
It is sandwiched between the uppermost layer and the lowermost layer, and is formed from an intermediate portion consisting of a plurality of intermediate layers,
The wooden wheel, wherein the uppermost layer and the lowermost layer are thicker than a thickness of the intermediate layer constituting the intermediate portion.   2. The wooden wheel according to claim 1, wherein the uppermost layer and the lowermost layer are configured such that a pair of cross-sectional fan-shaped pieces are sandwiched between vertically long pieces of cross-section.   3. The wooden wheel according to claim 1, wherein four pieces of the vertically long pieces are provided on each of the uppermost layer and the lowermost layer. 4.   4. The wooden wheel according to claim 1, wherein the uppermost layer and the lowermost layer have a thickness of 1.5 to 3.5 times the thickness of the intermediate layer.   The wooden wheel according to any one of claims 1 to 4, wherein the ground contact surface is formed by a mesh or a memorial mesh. The wooden wheel according to any one of claims 1 to 5, further comprising a side plate on at least one side surface of the main body.