Road cone

Abstract

To provide a road cone which makes a once-installed security light hard to come off and is easy to lift and move regardless of whether or not the security light is installed.SOLUTION: A road cone 1 with a cone body part 3 formed in a cylindrical shape whose diameter is gradually reduced from a lower part to an upper part has: a groove 9 which is provided on an inner wall of an upper end part of the cylindrical cone body part 3 and through which a projection part 13 provided on a base end part 11 of a safety light 7 passes when the safety light 7 is installed; and an annular recessed part 17 which is formed on an outer wall of the upper end part of the cylindrical cone body part 3.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a road cone capable of installing a warning light at its upper end.

Background Art

[0002] Conventionally, a frustum-shaped road cone with a warning light installed at its top is known (see Patent Document 1). The warning light includes a base end portion and a main body portion having a light-emitting body. The base end portion of the warning light is formed in a cylindrical shape, and a key projects from the outer peripheral surface of the base end portion.

[0003] A key groove is formed in the inner wall of the top (upper end) of the road cone. The warning light is installed on the road cone by inserting the base end portion into the top of the road cone. In the state where the warning light is being installed on the road cone, the key projecting from the outer peripheral surface of the base end portion passes through the key groove formed in the inner wall of the top of the road cone.

[0004] After the base end portion of the warning light is completely inserted into the top of the road cone, the key disengages from the key groove and is positioned slightly below the lower end of the key groove. In this state, the space around the key (the space inside the road cone) is widened, and the warning light can rotate with respect to the road cone about the central axis of the cylinder of the base end portion of the warning light.

[0005] After the base end portion of the warning light is completely inserted into the inside of the top of the road cone, the warning light is rotated by an appropriate angle with respect to the road cone. As a result, even if the warning light tries to move upward with respect to the road cone, the key is caught by the wall of the road cone, preventing the warning light from coming out upward.

[0006] In addition, in the state where the warning light is installed on the road cone, the main body portion of the warning light projects upward from the upper end of the road cone.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Japanese Patent Publication No. 2020-170129 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] By the way, conventional road cones make it difficult for safety lights to come loose once they are installed. However, because road cones are formed in a truncated cone shape, there is no suitable place to grip them by hand, making it difficult to lift them when gripped, as they tend to slip.

[0009] Furthermore, if a safety light is installed, drivers may be tempted to grab the safety light instead of the road cone, but this should be avoided from a strength and other perspectives. In other words, if you grab the safety light and lift the road cone, the combined weight of the safety light and the road cone (including the combined mass of the safety light and the road cone multiplied by the acceleration during lifting) will be placed on the safety light, which is undesirable.

[0010] The present invention aims to provide a road cone that can have a safety light installed on its top, which makes it difficult to remove the safety light once it has been installed, and which is easy to lift and move regardless of whether or not a safety light is installed. [Means for solving the problem]

[0011] A road cone according to an aspect of the present invention is a road cone having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, and having a safety light mounting portion provided at the upper end of the cone body and installed in a manner that prevents the safety light from falling out, and a finger hook portion provided at the upper end of the outside of the cylinder of the cone body and allowing a person's fingers to get in and hook onto it when lifting it.

[0012] A road cone according to an aspect of the present invention is a road cone having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, and having a groove provided on the inner wall of the upper end of the cylindrical cone body through which a projection provided on the base end of the safety light passes when the safety light is installed, and an annular recess formed on the outer wall of the upper end of the cylindrical cone body.

[0013] Furthermore, in a road cone according to an aspect of the present invention, the cone body is configured to include a safety light engaging portion and a conical base cylindrical portion, the safety light engaging portion is formed in a cylindrical shape, and the base end of the safety light is inserted into the inside of the cylindrical safety light engaging portion and installed, the groove is formed in the inner wall of the cylindrical safety light engaging portion through which the protrusion provided on the base end of the safety light enters and passes, the conical base cylindrical portion is formed in a cylindrical shape in which the diameter gradually decreases as it goes upward, and the safety light engaging portion is provided at the upper end of the conical base cylindrical portion, on the inside of the conical base cylindrical portion.

[0014] Furthermore, in the road cone according to an embodiment of the present invention, a protrusion is provided on the outer circumference of the safety light engaging portion.

[0015] Furthermore, in the road cone according to an embodiment of the present invention, the width dimension of the groove is constant from the upper end to the middle part, and gradually increases from the middle part towards the lower end.

[0016] A road cone according to an aspect of the present invention is a road cone having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, wherein the cone body is composed of a safety light engaging portion and a conical base cylindrical portion, the safety light engaging portion is formed in a cylindrical shape and is configured so that the base end of a safety light is inserted into the inside of the cylindrical safety light engaging portion, a groove is formed in the inner wall of the cylindrical safety light engaging portion through which a projection provided on the base end of the safety light enters and passes, the conical base cylindrical portion is formed in a cylindrical shape with a diameter that gradually decreases from top to bottom, and the safety light engaging portion is provided at the upper end of the conical base cylindrical portion, inside the conical base cylindrical portion. [Effects of the Invention]

[0017] According to the present invention, it is possible to make it difficult to remove a safety light once it has been installed, and to provide a road cone that is easy to lift and move regardless of whether a safety light is installed or not. [Brief explanation of the drawing]

[0018] [Figure 1] This is a perspective view of a road cone according to an embodiment of the present invention. [Figure 2] This is a perspective view of a road cone according to an embodiment of the present invention, showing a cross-section taken by a plane that includes the center of the road cone and is perpendicular to the vertical direction. [Figure 3] This is an enlarged view of part III in Figure 2. [Figure 4] This is a perspective view from above of the safety light engaging portion of a road cone according to an embodiment of the present invention. [Figure 5] This is a perspective view from below of the safety light engaging portion of a road cone according to an embodiment of the present invention. [Figure 6] This is a view from arrow VI in Figure 5, with the cylindrical base added. [Figure 7]FIG. 0 is a view showing a state in which a safety lamp is installed on a road cone according to an embodiment of the present invention, and (b) is a view taken along the line VIIB-VIIB in (a). [Figure 8] FIG. 3 is a view showing a safety lamp installed on a road cone according to an embodiment of the present invention, (b) is a view taken along the line VIIIB in (a), and (c) is a view taken along the line VIIIC in (a). [Figure 9] FIG. 6 is a view showing an operation of installing a safety lamp on a road cone according to an embodiment of the present invention. [Figure 10] FIG. 9 is a view showing a road cone according to a comparative example. [Figure 11] FIG. 12 is a view showing a road cone according to a comparative example. [Figure 12] FIG. 15 is a view showing a road cone according to a comparative example. [Figure 13] FIG. 18 is a view showing a road cone according to a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION

[0019] A road cone (traffic cone) 1 according to an embodiment of the present invention is, for example, installed and used on a road, and as shown in FIGS. 1 and 2, it is configured to include a cone main body portion 3 and a pedestal portion 5. As shown in FIG. 7, a safety lamp 7 can be installed on the road cone 1.

[0020] Here, for the sake of convenience of explanation, a predetermined horizontal one direction is defined as the vertical direction, a predetermined horizontal other direction that is orthogonal to the vertical direction is defined as the horizontal direction, and a direction orthogonal to both the vertical direction and the horizontal direction is defined as the vertical and horizontal direction.

[0021] The cone main body portion 3 is formed in a cylindrical shape (for example, a frustum of a cone cylindrical shape) in which the diameter (the value of the outer diameter and the value of the inner diameter) gradually decreases from bottom to top. Although it will be described in detail later, at the upper end portion of the cone main body portion 3, the value of the inner diameter of the cone main body portion 3 is a constant value (see FIG. 7 and the like).

[0022] As shown in Figure 3, etc., a groove (for example, a keyway) 9 is provided on the inner wall of the upper end of the cylindrical cone body 3. When the safety light 7 is installed on the cone body 3 (road cone 1), as shown in Figure 7(a), a projection (for example, a key) 13 provided on the base end (for example, a cylindrical base end) 11 of the safety light 7 passes through the keyway 9.

[0023] As described above, at the upper end of the cone body 3, the inner diameter of the cone body 3 is constant over a predetermined length (for example, the minimum value of the inner diameter in the cone body 3). Below the upper end where the inner diameter is constant at a minimum value, as shown in Figure 7, the diameter (outer diameter and inner diameter) of the cylindrical cone body 3 gradually increases from top to bottom.

[0024] In the process of installing the safety light 7 onto the cone body 3 while moving it downwards relative to the cone body 3, the base end 11 of the safety light 7 is inserted into the upper end of the cone body 3. Also, in the above intermediate state, as described above, the key 13 of the safety light 7 passes through the key groove 9 provided on the inner wall of the upper end of the cone body 3.

[0025] When the safety light 7 is moved further downward, the main body of the safety light 7 (the main body which is equipped with a light-emitting element such as an LED, not shown) 15 comes into contact with the upper end of the cone body 3, and the key 13 comes out of the keyway 9 and is positioned below the keyway 9.

[0026] Next, the safety light 7 is rotated by a predetermined angle around the central axis C1, which extends vertically, causing the key 13 to separate from the keyway 9. In this separated state, even if one attempts to simply move the safety light 7 upward relative to the cone body 3, the key 13 cannot enter the keyway 9. This prevents the safety light 7 from coming out of the cone body 3.

[0027] As shown in Figures 1 to 3, an annular recess 17 is formed on the outer wall of the upper end of the cylindrical cone body 3. The base 5 is provided at the lower end of the cone body 3, as shown in Figures 1 and 2.

[0028] As shown in Figures 2 and 3, the cone body 3 is composed of a safety light engaging portion 19 and a conical base cylindrical portion 21. The safety light engaging portion 19 is formed in a cylindrical shape (for example, a cylindrical shape). The columnar (for example, cylindrical) base end 11 of the safety light 7 is inserted into the columnar space (for example, a cylindrical space) inside the cylindrical safety light engaging portion 19, so that the safety light 7 is installed in the cone body 3.

[0029] A keyway 9 is formed in the inner wall of the cylindrical safety light engaging portion 19, through which the key 13, provided on the base end 11 of the safety light 7, enters and passes. Note that the safety light engaging portion 19 is not a perfect cylinder (for example, a cylindrical shape), but rather has a protrusion 23 that gives it a roughly cylindrical shape.

[0030] The cone-shaped cylindrical portion 21 is constructed separately from the safety light engaging portion 19 and is formed in a cylindrical shape (for example) in which the diameter (outer diameter and inner diameter) gradually decreases towards the top. The safety light engaging portion 19 is integrally provided at the upper end of the cone-shaped cylindrical portion 21, on the inside of the cone-shaped cylindrical portion 21. The outer circumferential surface of the safety light engaging portion 19 is in contact with the cone-shaped cylindrical portion 21.

[0031] In a frustoconical cylinder, the frustoconical cylinder refers to the three-dimensional shape obtained by removing the second frustocone from the first frustocone. The second frustocone is slightly smaller than the first frustocone.

[0032] To explain further, the height dimension of the first frustum of a cone is equal to the height dimension of the second frustum of a cone. The diameter of the base circle of the second frustum of a cone is slightly smaller than the diameter of the base circle of the first frustum of a cone. The diameter of the top circle of the second frustum of a cone is slightly smaller than the diameter of the top circle of the first frustum of a cone. The difference between the diameter of the base circle of the first frustum of a cone and the diameter of the base circle of the second frustum of a cone is equal to the difference between the diameter of the top circle of the first frustum of a cone and the diameter of the top circle of the second frustum of a cone.

[0033] The central axis of the first frustum of cone and the central axis of the second frustum of cone coincide with each other. In the direction of extension of the central axis of the first frustum of cone and the central axis of the second frustum of cone (the height direction of the first frustum of cone and the height direction of the second frustum of cone), the position of the base of the first frustum of cone and the position of the base of the second frustum of cone coincide with each other. Also, the position of the top surface of the first frustum of cone and the position of the top surface of the second frustum of cone coincide with each other.

[0034] Note that the cone body 3 (frustum-shaped cylindrical part 21) does not necessarily have to be in the shape of a frustum-shaped cone; it may be. The frustum-shaped cylinder differs from the frustum-shaped cylinder in that its base and top surfaces are not circles but, for example, regular polygons, but in other respects, it is formed in the same way as the frustum-shaped cylinder.

[0035] The cone body portion 3 (frustum-shaped cylindrical portion 21), as described in relation to the safety light engagement portion 19, is not perfectly shaped like a frustum-shaped cylinder (for example, a truncated cone), but rather has a shape that approximates a frustum-shaped cylinder, i.e., it is frustum-shaped.

[0036] The cone body 3 (the safety light engaging portion 19 and the cone-shaped cylindrical portion 21) is made of, for example, synthetic resin. The safety light engaging portion 19 is molded in primary molding (for example, the first injection molding) (for example, injection molding using a mold). After this, the cone-shaped cylindrical portion 21, which is integrated with the safety light engaging portion 19, is molded in secondary molding (for example, the second injection molding) (for example, injection molding using a mold). The reason for separating the safety light engaging portion 19 and the cone-shaped cylindrical portion 21 (by separating them into primary and secondary molding) is to minimize the difference in wall thickness between each part of the cone body 3 so as not to hinder the molding process.

[0037] As shown in Figures 4 to 6, a protrusion (flange-shaped portion) 23 is provided on the outer circumference of the safety light engaging portion 19 to prevent the safety light engaging portion 19 from coming out of the cone-shaped cylindrical portion 21. The protrusion 23 is formed, for example, in an annular shape, and a plurality of small recesses 25 are provided on the outer circumference of the annular protrusion 23. The recesses 25 are provided to further strengthen the fixation of the safety light engaging portion 19 to the cone-shaped cylindrical portion 21. The plurality of recesses 25 are arranged at predetermined intervals in the circumferential direction on the outer circumference of the annular protrusion (flange-shaped portion) 23.

[0038] As shown in Figure 3, the width dimension of the keyway 9 (the dimension in the horizontal direction) is constant from the top to the middle in the vertical direction, and gradually increases from the middle to the bottom.

[0039] Furthermore, a recess 27 is formed on the inner wall of the cylindrical safety light engaging portion 19 to reduce friction between the safety light 7 and the safety light engaging portion 19.

[0040] The recess 27 extends in the direction of extension (up and down) of the central axis C1 of the cylindrical safety light engaging portion 19. The recess 27 extends from the lower end to near the upper end of the cylindrical safety light engaging portion 19. To explain further, since the recess 27 only extends from the lower end to near the upper end of the cylindrical safety light engaging portion 19 in the up and down direction, the recess 27 is not visible when viewing the cylindrical safety light engaging portion from above. On the other hand, as shown in Figure 6, the recess 27 is visible when viewing the cylindrical safety light engaging portion 19 from below.

[0041] Multiple recesses 27 are provided. The multiple recesses 27 are arranged at predetermined intervals along the circumferential direction of the inner wall of the cylindrical safety light engaging portion 19.

[0042] Now, let's explain Road Cone 1 in more detail.

[0043] As shown in Figures 4 to 6, the safety light engaging portion 19 is composed of a cylindrical safety light engaging portion body 22 and a protrusion 23. The central axis C1 of the cylindrical safety light engaging portion body 22 extends in the vertical direction. Furthermore, as described above, the safety light engaging portion body 22 causes the inner diameter of the cone body 3 to be constant over a predetermined length at the upper end of the cone body 3 (for example, the minimum value of the inner diameter of the cone body 3).

[0044] The protrusion 23 is formed in an annular shape, and its cross-sectional shape (the shape of the cross-section by a plane perpendicular to the circumferential direction of the annulus) is a small rectangle. Multiple protrusions 23 (for example, two) are provided. The upper protrusion 23A is located in the middle of the main body 22 of the safety light engaging part in the vertical direction. The lower protrusion 23B is located at the lower end of the main body 22 of the safety light engaging part.

[0045] The outer diameter of the upper protrusion 23A and the outer diameter of the lower protrusion 23B are, for example, the same. The thickness (vertical dimension) of the lower protrusion 23B is greater than the thickness (vertical dimension) of the upper protrusion 23A. This ensures that when the road cone 1 on which the safety light 7 is installed is lifted by gripping the safety light 7, the safety light engaging portion 19 does not come out of the conical cylindrical portion 21.

[0046] The recesses 25 of the protrusions 23A and 23B are arc-shaped indentations extending from the outer circumferential surface of the protrusion 23 toward the center of the safety light engaging portion 19. The bottom of the recesses 25 does not reach the outer circumference of the cylindrical safety light engaging portion body 22. The recesses 25 are arranged at a constant small interval in the circumferential direction of the protrusions 23A and 23B, and penetrate the protrusions 23A and 23B in the vertical direction.

[0047] The keyway 9 is formed by an upper portion 9A and a lower portion 9B. The keyway 9 has a vertical depth and a horizontal width. The keyway 9 penetrates the cylindrical safety light engaging body portion 22 in the vertical direction.

[0048] The depth dimension of the keyway 9 is constant. The width dimension of the upper portion 9A of the keyway 9 is constant. The width dimension of the lower portion 9B of the keyway 9 is the same as that of the upper portion 9A at the upper end of the lower portion 9B, but gradually increases as it goes downwards, widening equally on both sides in the lateral direction. In addition, the wall thickness (wall thickness in the radial direction) of the cylindrical safety light engaging part body 22 is thinner in the area where the keyway 9 is provided compared to other areas.

[0049] As shown in Figure 6, there are multiple recesses (for example, five). Viewed in the vertical direction, the recesses 27 are formed in a rectangular shape similar to the upper portion 9A of the keyway 9. The width dimension of the recesses 27 is equal to or slightly smaller than the width dimension of the upper portion 9A. The depth dimension of the recesses 27 is slightly smaller than the depth dimension of the keyway 9.

[0050] When viewed from below in the vertical direction, as shown in Figure 6, the keyway 9 and the multiple recesses 27 are positioned to equally distribute the inner circle of the cylindrical safety light engaging part body 22. Also, in the vertical direction, as described above, the recesses 27 do not reach the upper end of the safety light engaging part body 22.

[0051] In addition, the recess 27 may be used as an exhaust channel (an exhaust channel that discharges air from inside the road cone 1 to the outside of the road cone 1) when installing the safety light 7 on the road cone 1. In this configuration, at least one of the multiple recesses 27 penetrates the cylindrical safety light engaging part body 22 in the vertical direction.

[0052] The truncated cone-shaped cylindrical portion 21 forms the majority of the cone body portion 3. Thus, the cone body portion 3 is formed in a truncated cone shape. A safety light engaging portion 19 is installed at the upper end of the truncated cone-shaped cylindrical portion 21. As a result, the inner diameter is constant at the upper end of the truncated cone-shaped cylindrical portion 21. The safety light engaging portion 19 is located inside the truncated cone-shaped cylindrical portion 21 at its upper end. The central axis C1 of the cylindrical safety light engaging portion 19 and the central axis of the truncated cone-shaped cylindrical portion 21 coincide.

[0053] To explain further, as shown in Figure 3, the entire surface of the cylindrical side surface (outer peripheral surface) 22A of the main body portion 22 of the safety light engaging portion 19, and the entire surface of the upper convex portion 23A (including the surface of the recess 25) are in contact with the truncated base cylindrical portion 21. In addition, the entire surface of the upper surface 23Ba of the lower convex portion 23B, and the entire surface of the peripheral surface 23Bb of the lower convex portion 23B, are in contact with the fleshy part of the truncated base cylindrical portion 21.

[0054] In the vertical direction, the upper end of the safety light engaging portion 19 and the upper end of the safety light engaging portion main body 22 coincide. Also, in the vertical direction, the lower end of the safety light engaging portion 19 and the lower end of the upper end of the safety light engaging portion main body 22 coincide.

[0055] The annular recess 17 is formed around the entire circumference of the truncated cylindrical portion 21 and is circular in shape. When viewed in horizontal directions such as the lateral and vertical directions, the annular recess 17 is formed in an arc shape that is recessed towards the center of the cone body portion 3. In the vertical direction, the upper end of the annular recess 17 is located below the upper end of the cone body portion 3, and the lower end of the annular recess 17 is located slightly below the lower end of the safety light engaging portion 19.

[0056] The mass of the base portion 5 is greater than the mass of the cone body portion 3 and the mass of the safety light 7. As shown in Figures 1 and 2, the base portion 5 is formed in the shape of a rectangular plate and is integrally attached to the cone body portion 3 at its lower end. When viewed in the vertical direction, the cone body portion 3 is located inside the base portion 5, and the center of the base portion 5 and the center of the cone body portion 3 coincide with each other.

[0057] As described above and shown in Figure 8, the safety light 7 is composed of a base end 11 and a main body 15. The base end 11 protrudes downward from the lower end of the main body 15. When the safety light 7 is installed on the cone body 3, as shown in Figure 7, the central axis C1 of the cone body 3 and the central axis of the base end 11 of the safety light 7 coincide with each other. The outer diameter of the base end 11 of the safety light 7 is smaller than the inner diameter of the safety light engagement portion 19 of the cone body 3, but the outer diameter of the base end 11 of the safety light 7 may be approximately equal to the inner diameter of the safety light engagement portion 19 of the cone body 3.

[0058] There are, for example, two keys 13. The upper key 13A is located slightly below the lower end of the main body 15 of the safety light 7 in the vertical direction. The lower key 13B is located slightly above the lower end of the base end 11 of the safety light 7 in the vertical direction. In the vertical direction, the lower key 13B is positioned point-symmetrically with respect to the upper key 13A with respect to the central axis of the base end 11.

[0059] The installation procedure for the safety light 7 on the road cone 1 will be explained.

[0060] Starting from the initial state shown in Figure 9(a), the safety light 7 is moved downward relative to the road cone 1, the lower key 13B is inserted into the keyway 9, and the base end 11 of the safety light 7 is inserted into the upper end (safety light engaging portion 19) of the cone body 3. This insertion is continued until the lower key 13B comes out of the keyway 9 and is positioned slightly below the keyway 9. When this insertion is complete, the base end 11 of the safety light 7 is inserted into the upper end of the cone body 3, and the upper key 13A is positioned slightly above the upper end of the road cone 1.

[0061] Next, the safety light 7 is rotated 180° around the central axis C1 (see Figure 9(b)). After this, the safety light 7 is moved further downward relative to the road cone 1. As a result, the upper key 13A enters the keyway 9, and the main body 15 of the safety light 7 comes into contact with the upper end of the cone body 3 (see Figure 7).

[0062] With the above steps completed, the installation of the safety light 7 on the road cone 1 is finished. In this state, the safety light 7 does not rotate relative to the road cone 1, nor does the safety light 7 come loose from the road cone 1.

[0063] When removing the safety light 7 from the road cone 1, simply reverse the installation procedure described above.

[0064] The road cone 1 is provided with a keyway 9 located on the inner wall of the upper end of the cone body 3, through which a key 13 located on the base end 11 of the safety light 7 passes when the safety light 7 is installed, and an annular recess 17 formed on the outer wall of the upper end of the cone body 3.

[0065] Furthermore, the key 13 catches on the safety light engagement part 19, making it difficult for the safety light 7, once installed, to come off the road cone 1. In addition, the annular recess 17 forms a gripping part, making it easier to lift and move the road cone 1 regardless of whether the safety light 7 is installed or not.

[0066] Furthermore, in the road cone 1, the cone body portion 3 is configured to include a safety light engaging portion 19 and a conical base cylindrical portion 21. This minimizes the difference in wall thickness of the cone body portion 3, making it easier to mold the road cone 1.

[0067] To explain further, when injection molding the load cone 1, if the difference in wall thickness of the load cone 1 is too large, the local cooling rate will differ during the molding process, causing derivative shrinkage deformation. By reducing the difference in wall thickness of the cone body 3, the situation in which the yield rate of finished load cone 1 is low is improved, and the stability of the finished product dimensions is enhanced.

[0068] Here, we show a load cone 301 without a keyway, as shown in Figures 10 and 11. The difference between the wall thickness W1 of the load cone 301 at the upper end of the annular recess 303 and the wall thickness W2 of the load cone 301 at the lower end of the annular recess 303 is small. As a result, even if the load cone 301 is molded as a single piece, no particular problems occur during molding.

[0069] Next, Figures 12 and 13 show a load cone 307 provided with a keyway 305. The difference between the wall thickness W3 of the load cone 307 at the upper end of the annular recess 309 and the wall thickness W4 of the load cone 307 at the lower end of the annular recess 309 is large. As a result, problems arise during molding if the load cone 307 is molded as a single piece.

[0070] In other words, when the recess 309 and keyway 305 are installed, the slight increase in thickness causes the cooling rates of each part to be uneven after injection molding, resulting in a decrease in the yield rate of the finished product (load cone) 307.

[0071] Furthermore, in the road cone 1, a protrusion 23 is provided on the outer circumference of the upper end of the cone body 3. As a result, even if the safety light engaging portion 19, which is molded separately from the conical base cylindrical portion 21, attempts to move vertically relative to the conical base cylindrical portion 21, the protrusion 23 is in contact with the flesh of the conical base cylindrical portion 21, preventing movement. This reliably prevents the safety light engaging portion 19 from coming out of the conical base cylindrical portion 21 (moving upward). It also reliably prevents the safety light engaging portion 19 from entering the conical base cylindrical portion 21 (moving downward).

[0072] Furthermore, in the road cone 1, multiple recesses 25 are provided on the outer circumference of the annular protrusion 23. As a result, the flesh of the conical base cylindrical portion 21 fits into the multiple recesses 25. Even if the safety light engaging portion 19 attempts to rotate relative to the conical base cylindrical portion 21 around the central axis C1 of the safety light engaging portion 19, the flesh of the conical base cylindrical portion 21 that fits into the recesses 25 will get in the way. This effectively prevents the safety light engaging portion 19 from rotating relative to the conical base cylindrical portion 21.

[0073] Furthermore, in the road cone 1, the width of the keyway 9 is constant from the top to the middle, and gradually increases from the middle to the bottom. This makes it easier for the key 13 to enter the keyway 9 even if the rotation angle of the safety light 7 relative to the road cone 1 is slightly off when removing the safety light 7 from the road cone 1. This makes it easier to remove the safety light 7 from the road cone 1.

[0074] Furthermore, in the road cone 1, a recess 27 is formed in the inner wall of the cylindrical safety light engaging portion 19. This reduces the frictional force between the inner wall of the cylindrical safety light engaging portion 19 and the base end portion 11 of the safety light 7, making it easier to move and rotate the safety light 7 relative to the road cone 1.

[0075] Furthermore, in the road cone 1, when viewing the cylindrical safety light engagement portion 19 from above in the vertical direction, only the keyway 9 is visible, and the recess 27 is not visible. This makes it easier to align the key with the keyway 9 when installing the safety light 7 on the road cone 1.

[0076] Here, the aforementioned road cone 1 may be understood as the road cone shown below.

[0077] A road cone having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, wherein the cone body is composed of a safety light engaging portion and a conical base cylindrical portion, the safety light engaging portion is formed in a cylindrical shape and is configured so that the base end of the safety light is inserted into the inside of the cylindrical safety light engaging portion, a groove is formed in the inner wall of the cylindrical safety light engaging portion through which a projection provided on the base end of the safety light enters and passes, the conical base cylindrical portion is formed in a cylindrical shape with a diameter that gradually decreases from top to bottom, and the safety light engaging portion is provided inside the conical base cylindrical portion at the upper end of the conical base cylindrical portion.

[0078] Alternatively, the road cone may be understood as having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, and having a safety light mounting part provided at the upper end of the cone body, which is installed in such a manner that the safety light becomes difficult to remove and does not rotate when the base end of the safety light is inserted into the safety light, and a finger hook part provided at the upper end of the outside of the cylinder of the cone body, which is for example composed of an annular recess 17, and which allows a person's fingers to get in and hook onto the road cone when it is lifted.

[0079] In this embodiment of the road cone, as already understood, when the safety light is installed in the cone body (safety light mounting section), the safety light will not come out of the cone body simply by moving the safety light linearly upward relative to the cone body. The safety light body of the installed safety light protrudes upward from the upper end of the cone body. [Explanation of Symbols]

[0080] 1 Road cone 3. Cone body 7 Security light 9 grooves (keyways) 11 Proximal end 13. Protruding part (key) 17. Ring-shaped recess (finger hook) 19 Security light engagement part 21. Cylindrical part of the pyramidal base 23 Convex part

Claims

1. A road cone having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, It is provided on the inner wall of the upper end of the cylindrical cone body and has a groove through which a protrusion provided at the base end of the safety light passes when the safety light is installed. The width dimension of the groove is constant from the top to the middle of the road cone, and gradually increases from the middle to the bottom.

2. A road cone having a cone body that is formed in a cylindrical shape with a diameter that gradually decreases from bottom to top, A groove is provided on the inner wall of the upper end of the cylindrical cone body, through which a projection provided at the base end of the safety light passes when the safety light is installed, An annular recess formed in the outer wall of the upper end of the cylindrical cone body, It has, The cone body is composed of a safety light engaging portion and a conical base cylindrical portion. The safety light engagement portion is formed in a cylindrical shape, and the base end of the safety light is inserted into the inside of the cylindrical safety light engagement portion for installation. A groove is formed in the inner wall of the cylindrical safety light engagement portion, through which a protrusion provided on the base end of the safety light enters and passes. The aforementioned conical base cylindrical portion is formed in a cylindrical shape in which the diameter gradually decreases as it goes upward, and the safety light engaging portion is provided at the upper end of the conical base cylindrical portion, on the inside of the conical base cylindrical portion. A protrusion is provided on the outer circumference of the aforementioned safety light engaging portion. The aforementioned conical base cylindrical portion is integrally provided with the safety light engagement portion. The protrusion of the safety light engaging portion is formed by an annular flange-like portion and is located in the middle of the safety light engaging portion in the vertical direction. Multiple recesses are provided on the outer circumference of the protrusion of the safety light engaging portion, and these recesses are arranged at predetermined intervals in the circumferential direction of the outer circumference of the annular flange-shaped portion. A road cone in which the outer circumference of the safety light engaging portion, including the convex portion and the concave portion, is in contact with the conical base cylindrical portion.

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