Indicator

Abstract

The objective is to provide a display device with superior handling performance without significantly changing the shape from conventional displays. [Solution] The present invention, which solves the above problems, comprises a cylindrical body 1 and a through portion 2 which is a hole that penetrates the inside and outside of the body 1, wherein the through portion 2 has a peripheral edge portion 21 that forms the periphery of the hole and a projection portion 22 that protrudes from the peripheral edge portion 21 toward the center of the hole, the peripheral edge portion 21 includes a straight or curved peripheral edge 211, and the projection portion 22 protrudes away from both ends of the peripheral edge 221, the display X

Description

Technical Field

[0004] , ,

[0005] , , ,

[0001] The present invention relates to a so-called load cone type display with improved performance.

Background Art

[0002] A load cone is a highly visible colored conical material used for safety and traffic guidance at construction sites, parking lots, etc., and is placed to prompt attention to vehicles and pedestrians. When using load cones to divide sections, a cone bar is mainly used. To attach it, it is necessary to stack the rings provided at both ends of the long bar in alignment with the upper end of the cone, which is heavy labor when there are many.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In contrast, Patent Document 1 provides holes on the surface of the load cone and enables connection of load cones by inserting a rope through the holes. On the other hand, in the invention described in Patent Document 1, to connect multiple load cones, it is necessary to pass a single rope through each cone, which is difficult to handle. In Patent Document 2, although the upper end is hook-shaped and a rope or chain can be hung, since the shape of the upper end is different from normal, it is difficult to stack the cones well, and there may be cases where expansion parts cannot be attached.

[0005] In view of the above problems, an object of the present invention is to provide a display with excellent handling performance without significantly changing the shape from conventional displays.

Means for Solving the Problems

[0006] The present invention, which solves the above problems, is a display device comprising a cylindrical body and a through portion which is a hole that penetrates the inside and outside of the body, wherein the through portion has a peripheral portion which forms the periphery of the hole and a projection which protrudes from the peripheral portion toward the center of the hole, the peripheral portion includes a straight or curved peripheral edge, and the projection protrudes away from both ends of the peripheral edge. This configuration allows for improved handling by enabling the attachment of chains or ropes to the protruding parts, while maintaining almost the same contour shape as conventional displays. [Effects of the Invention]

[0007] The present invention, which solves the above problems, can provide a display device with superior handling performance without significantly changing the shape from conventional displays. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the entire display unit according to an embodiment of the present invention. [Figure 2] This is an enlarged perspective view showing the area around the through-hole of a display according to an embodiment of the present invention. [Figure 3] These are a front view and a top view showing the area around the through-hole of a display unit according to an embodiment of the present invention. [Figure 4] This is a cross-sectional view showing the area around the through-hole of a display according to an embodiment of the present invention. [Figure 5] This is an explanatory diagram illustrating a method of using a display device according to an embodiment of the present invention. [Figure 6] This is an explanatory diagram illustrating a method of using a display device according to an embodiment of the present invention. [Figure 7] This is an explanatory diagram illustrating a method of using a display device according to an embodiment of the present invention. [Figure 8] These are a front view of the area around the through-hole of the display unit and a cross-sectional view of the display unit in use, according to a modified example of the present invention. [Figure 9] This is a front view showing the area around the through-hole of a display unit according to a modified example of the present invention. [Figure 10] This is an explanatory diagram showing the area around the through-hole of a display unit, according to another modification of the present invention. [Modes for carrying out the invention]

[0009] 《First Embodiment》 The following description will explain an embodiment of the display device X of the present invention with reference to the drawings. The explanation will detail the configuration of the embodiment, the method of implementation, and modifications. The embodiments described below are examples of the present invention and are not limited to these embodiments. Furthermore, the term "abbreviated" in the application documents is a concept that includes shapes that have been chamfered or rounded, and shapes in which the elements constituting the shape have been deformed or altered in length to the extent that it does not impede the purpose or effect of the configuration.

[0010] As shown in Figures 1 and 2, the present invention comprises a cylindrical body 1 and a through-hole 2 that penetrates the inside and outside of the body 1, wherein the through-hole 2 has a peripheral edge 21 that forms the periphery of the hole and a projection 22 that protrudes from the peripheral edge 21 toward the center of the hole, the peripheral edge 21 includes a straight or curved peripheral edge 211, and the projection 22 protrudes away from both ends of the peripheral edge 211, forming a display X.

[0011] The display unit X comprises a main body 1 erected on the ground, a through-hole 2 on the side surface of the main body 1 that penetrates the inside and outside of the main body 1, a secondary through-hole 3 that penetrates the inside and outside of the main body 1 away from the through-hole 2, a reflector 4 provided on the side surface of the main body 1, an upper end opening 5 provided at the upper end, a vent 6 provided below the through-hole 2 on the main body 1 that allows air to pass through the inside of the main body 1, and a bottom surface 7 that supports the main body 1 at its bottom. Multiple display units X can be connected using auxiliary elements such as chains C, ropes R, and rods S to partition areas.

[0012] The main body 1 is a cylindrical member with a substantially conical outer appearance, standing upright with the upper end facing upward in the direction of gravity. By making it conical, the weight at the lower part is increased to stabilize the whole. The height of the main body 1 is assumed to be 600 mm to 800 mm, but it may be a large size of 1200 mm or more, or a small size of about 300 mm. Even with such a size of the configuration of the present invention, it is preferable because a chain or a rope can be hung on the protrusion 22 as described later.

[0013] As shown in FIGS. 3 and 4, the through-hole 2 is a hole portion provided so as to communicate the inside and outside of the main body 1. In the embodiment, the first through-hole 2A and the second through-hole 2B are provided opposite to each other. More specifically, the first through-hole 2A and the second through-hole 2B are arranged so as to overlap in a front view or a rear view, making it easier to penetrate a rope or the like. Further, the through-hole 2 has a peripheral portion 21 provided as a peripheral edge of the hole, and the peripheral portion 21 includes a plurality of straight or curved peripheral sides 211. Furthermore, the through-hole 2 has protrusions 22 protruding away from both ends of the peripheral side 211, and is provided so that a rope, a chain, or the like can be hung. Here, FIG. 3(a) is a front view extracted near the through-hole 2 of the display X, and FIG. 3(b) is a similar plan view. Also, FIG. 4(a) is a schematic diagram of a U-U cross-section, and FIG. 4(b) is a schematic diagram of a V-V cross-section.

[0014] The auxiliary through-hole 3 is a hole portion provided so as to communicate the inside and outside of the main body 1 at a position away from the through-hole 2. The auxiliary through-hole 3 has a first auxiliary through-hole 3A and a second auxiliary through-hole 3B provided opposite to each other. More specifically, the first auxiliary through-hole 3A and the second auxiliary through-hole 3B are arranged so as to overlap in a side view, making it easier to penetrate and arrange a rope R, a rod S, or the like.

[0015] The reflecting portion 4 is a member that reflects light and is provided on the surface of the main body 1. In the embodiment, the upper reflecting portion 41 and the lower reflecting portion 42 provided below the upper reflecting portion 41 are wound around the outside of the main body 1 with a space therebetween.

[0016] The upper opening 5 is an opening provided at the upper end of the main body 1, and is a portion with a horizontal top surface provided at the center of the upper end in a plan view. As shown in Fig. 4(a), the upper opening 5 projects inward from the periphery to increase the thickness compared to the entire main body 1 and enhance the strength. Further, the inner peripheral edge of the upper opening 5 has a portion protruding downward, and this portion is provided with a gap from the inner peripheral surface of the main body 1, allowing for some deformation, making it easier for members such as indicator lights to penetrate from above.

[0017] The air vent portions 6 are a plurality of holes provided at a position closer to the bottom surface 7 than the upper opening 5 of the main body 1. In the embodiment, triangular holes with the direction of the bottom surface 7 as the base are arranged at equal intervals. These holes are provided so that air (wind) can pass through.

[0018] The air vent portions 6 are provided in a plurality at equal intervals on a plane parallel to the bottom surface 7 in the main body 1, and an even number of holes are provided at equal intervals on this plane. In the embodiment, three planes parallel to the bottom surface 7 are provided at intervals, and six holes are arranged at equal intervals such that the base of the triangle is located on this plane. This allows air to pass through from three directions on the plane. Further, on adjacent planes, the positions of the holes in a plan view are shifted, enabling air to pass through from planes in various directions. Also, the sizes of the holes for each of the above-mentioned planes are arranged such that the holes on the bottom surface 7 side with a longer outer circumference length are larger than the holes on the upper opening 5 side, thereby equalizing the air flow rate received on the same plane and making it difficult to generate a moment in the height direction when receiving wind, preventing the display X from tipping over.

[0019] The air vent portions 6 are provided at a position closer to the bottom surface 7, which has a relatively larger projected area with respect to the wind than the upper opening 5, thereby suppressing the influence of the wind. Also, the holes of the air vent portions ⑥ are triangular with the base facing the bottom surface 7, increasing the length of the periphery with respect to the opening area, making it easier to have holes and enhancing the strength. Furthermore, the air vent section 6 is rounded from the outside inward, making it easier to grip and allowing air to pass through from the outside to the inside. The wind-venting section 6 has at least one hole located directly below the first penetration section 2A in a front view, making it less likely to tip over in the direction in which it is attached to the member. Similarly, the wind-venting section 6 has at least one hole located directly below the first secondary penetration section 3A, making it less likely to tip over in the direction in which it is attached to the member. Furthermore, the wind-venting section 6 has at least one hole positioned perpendicular to the penetration section 2 in a plan view, reducing the effect of wind in this direction and making it less likely for the attached chain or the like to tip over due to the action of wind.

[0020] The bottom portion 7 is made of a material having an opening facing the ground, and its density is at least greater than that of the main body 1. The bottom portion 7 has a bowl-shaped bottom portion body 70 and a plurality of ribs 71 provided on the inside of the bottom portion body 70, so that its shape does not easily change. Some of the ribs 71 are provided to protrude towards the ground from the lower end of the bottom portion body 70, and their end faces are provided to abut the ground. As a result, the bottom portion body 70 is less likely to be dragged on the ground, and its durability can be increased.

[0021] Here, the main body 1 and the bottom portion 7 are separate components and made of different materials, but they are attached in a way that prevents them from being removed. To describe the manufacturing method in detail, first the main body 1 is molded by injection molding or blow molding. This main body 1 has a flange portion at its lower end. Next, the flange portion of the main body 1 is placed in a mold that forms the bottom portion 7, and in this state, resin is poured into the mold to form the bottom portion 7.

[0022] The peripheral portion 21 is a polygonal part enclosed by a plurality of peripheral edges 211, and in this embodiment, it is provided in a substantially trapezoidal shape by four straight peripheral edges 211 when viewed from the front. The ends of the peripheral edges 211 are connected with fillets, and the overall shape is rectangular. Here, the peripheral edges 211 are straight or curved, and both ends of each are connected to the other peripheral edges 211.

[0023] The peripheral portion 21 is provided to have a generatrix peripheral edge 212 which is an edge that includes (or is parallel to) the generatrix of the main body 1. Two generatrix peripheral edges 212 are provided facing each other, and the peripheral portion 21 has an upper peripheral edge 213 that connects the two generatrix peripheral edges 212 on the upper end opening 5 side, and a lower peripheral edge 214 that connects them on the bottom surface 7 side.

[0024] The busbar edge 212 facilitates movement between the upper edge 213 and the lower edge 214 while a rope R or the like is in contact with it. In particular, fillets are provided at the ends where adjacent edges 211 connect, allowing the rope R to be easily moved from the busbar edge 212 to the height where the upper edge 213 is located, thereby facilitating operations such as winding the rope R and attaching it to the projection 22. Furthermore, the peripheral edge 21 is provided with rounded or chamfered corners that face outward as a whole, which reduces friction between the rope R and chain C and allows for smooth movement along the outer edge, thereby improving usability. On the peripheral edge 21, the top surfaces of the upper peripheral edge 213 and the lower peripheral edge 214 are provided horizontally to the bottom surface 7 (ground), which prevents the rope R that passes through from sagging inside the main body 1. In addition, the rounding or chamfering applied to the inward-facing corners of these edges is smaller than or absent than that applied to the outward-facing corners, which further enhances this effect.

[0025] The projection 22 is a projection that protrudes from a position away from both ends of the lower peripheral edge 214. In this embodiment, it protrudes from near the center of the lower peripheral edge 214, making it less likely to interfere with the generatrix peripheral edge 212. The protrusion height of the projection 22 is in the range of at least 1 / 3 to 2 / 3 of the distance between the upper peripheral edge 213 and the lower peripheral edge 214, and in this embodiment it is 1 / 2, specifically protruding about 3 cm to 4 cm from the lower peripheral edge 214.

[0026] The projection 22 is a flat plate member extending parallel to the generatrix direction, and extends so as to be inclined toward the central axis with respect to the central axis of the main body 1. This makes it less likely for the chain C or rope R to come off accidentally when attached to the projection 22. In addition, the thickness of the projection 22 is approximately the same as the thickness of the lower peripheral edge 214, which increases its strength. In other words, the through-hole 2 is provided so as to be cut out in a direction perpendicular to the generatrix direction. The projection 22 is provided at intervals from the extension line of the upper end opening 5. This prevents interference with the member inserted into the upper end opening 5, and also allows the chain C or rope R to be attached even when it is inserted.

[0027] The lower peripheral edge 214 is continuous with the projection 22 via a fillet, facilitating smooth operations such as sliding and attaching a chain C or rope R from the lower peripheral edge 214. The size of this fillet preferably occupies about one-third of the total height of the projection 22, and the connection is gentle. On the projection 22, the surface facing the central axis direction of the main body 1 is designed to have less rounding than the surface facing outwards. This allows the projection 22 to act as an anti-slip mechanism for the rope in the axial direction when the rope R is gripped by it. In this embodiment, this surface is not rounded. As an example of modification, the side of the projection 22 may be provided with an inverted triangular notch to support the rope R in a predetermined position.

[0028] The secondary penetration section 3 is a hole provided adjacent to the penetration section 2, and the shape and size of its peripheral edge, the secondary peripheral edge 31, are provided to be approximately the same as those of the peripheral edge 21. That is, the secondary peripheral edge 31 has two opposing peripheral edges parallel to the generatrix direction and two peripheral edges connecting these two peripheral edges at the end, and is processed with the same filleting and rounding as the peripheral edge 21. On the other hand, the secondary peripheral edge 31 is provided smoothly, and there are no protrusions or the like directed toward its center. As a result, the chain C and rope R can slide smoothly inside the secondary penetration section 3, making it easy to use the hole without using the protrusion 22. Also, a rigid rod S can be inserted directly into the secondary penetration section 3 to create a simple partition. Because the secondary peripheral edge 31 is smooth, smooth insertion and position adjustment are possible, and there is no rattling when inserted.

[0029] The first through-hole 2A and the second through-hole 2B each have a peripheral edge 21 and a projection 22 of the same shape and are provided at the same height. The first secondary through-hole 3A and the second secondary through-hole 3B each have a secondary peripheral edge 31 of the same shape. (Hereafter, these four holes will be referred to as through-holes.) The through-holes are provided such that the side closest to the upper opening 5 lies on the same plane perpendicular to the axial direction of the main body 1, and the side closest to the bottom surface 7 lies on the same plane parallel to this plane. In other words, the height at which each through-hole is provided is the same, allowing the rope R or chain C to be supported in various ways.

[0030] Furthermore, by having edges parallel to the generatrix direction on the periphery of each through-hole, the distance between the through-holes can be kept constant regardless of height, thereby increasing strength. As shown in Figure 4(b), the through-holes occupy 75% to 85% of the periphery shown in the AA cross-section, making it easy to insert chain C or rope R into the holes. Specifically, it is preferable to set the width between the through-holes to 10 mm to 20 mm so that the presence of the holes can be reliably perceived by touching the area around the through-holes with the palm of the hand.

[0031] Furthermore, as shown in Figure 4(a), the thickness of the main body 1 around the through-hole is approximately 1.2 to 2.0 times thicker in the inward direction of the cylinder compared to the area where the reflective portion 4 is provided. This increases strength without creating a step on the outside, even though a hole is provided. In this embodiment, the area where the main body 1 is relatively thicker extends from the upper end opening 5 to the area about 1 cm to 2 cm away from the surface including the lower edge of the through-hole towards the bottom surface 7. At least 1 cm around the through-hole or the portion between adjacent through-holes is thicker than the rest of the main body 1, resulting in higher strength.

[0032] The reflective section 4 is provided between the through-hole 2 and the air-venting section 6 and is made of a material with a reflectivity at least higher than that of the main body 1. In this embodiment, the reflective material is attached to the circumferential surface of the main body 1 with the heights aligned so that it wraps around the circumferential surface of the main body 1. The upper reflective section 41 and the lower reflective section 42 are spaced apart in the height direction, and the distance between the two materials is approximately equal to the distance between the upper reflective section 41 and the bottom edge of the through-hole. This makes it easier to locate the holes even in dark environments, thereby improving usability.

[0033] Instructions for use The following describes examples of how the present invention can be used, with reference to the drawings. The present invention is implemented by users who partition areas using chains C or ropes R. The following describes a method for attaching chains C or ropes to a single indicator X, but it is obvious that multiple indicators X can be partitioned by connecting them in the same manner. Furthermore, the following examples of use are just examples, and the methods of implementation are not limited to these; these methods may be combined as appropriate.

[0034] (Example of use 1) As shown in Figure 5, the user attaches the chain C to the projection 22. Then, with the chain in this position, the user inserts the indicator light P (extension part) into the upper opening 5. Due to the positional relationship between the projection 22 and the upper opening 5, the indicator light P and the chain C do not interfere with each other, making it easy to remove and replace as needed. The indicator light P may be changed to a sign, flag, security camera, etc., as needed.

[0035] (Example of use 2) As shown in Figure 6, the user can attach a loop to the end of the rope R and fasten it to the projection 22. In addition, the user can easily partition the direction perpendicular to the penetration 2 by inserting a rigid rod S through the first sub-penetration 3A and the second sub-penetration 3B.

[0036] (Example of use 3) As shown in Figure 7(a), the user inserts the rope R through the projection 22 into the first penetration 2A and the second penetration 2B. The user then makes a loop in the rope R and places it over the projection 22. By supporting the rope R at the corner of the projection 22, the position of the rope R relative to the display unit X is fixed to some extent, and bending of the rope R between the display units X can be prevented.

[0037] (Example of use 4) As shown in Figure 7(b), the user can fix the relative position of a single rope R by inserting it through the adjacent through-holes 2 and sub-through-holes 3 and tying it together, and can also bend the rope with a single display unit X. The user can also tie the rope R at a height higher than the projection 22 by inserting it through the upper end opening 5 and the through-hole. Here, since the upper end edge of the peripheral portion 21 is provided in a straight line, the angle of the rope R relative to the display unit X can be easily changed.

[0038] Example of changes The following describes in detail a modified display unit X of the present invention. Components similar to those in the embodiment are described using the same reference numerals and their explanations are omitted. As shown in Figure 8, the modified display unit X has a projection hole 221 in the projection 22 in addition to the configuration of the embodiment.

[0039] As shown in Figure 8(a), the projection hole 221 is provided near the upper end of the projection 22 and is a hole that penetrates the surface of the projection 22. The opening of the projection hole 221 is positioned toward the axis, and its outer diameter is approximately 3 mm to 10 mm, allowing a bolt B of a typical diameter to be inserted. The projection hole 221 may have an internal thread on its inner surface to allow the bolt to be fixed in the inserted state.

[0040] When in use, as shown in Figure 8(b), a bolt B is inserted into the projection hole 221, forming a protrusion near the upper end of the projection 22 that extends from its surface. The chain C or rope R can be caught on this protrusion formed by the bolt B, preventing them from coming loose unintentionally and improving usability. Furthermore, since the bolt B is removable, the indicator X can be handled in the same way as a normal road cone if it is removed. Figure 7(b) is a schematic cross-sectional view obtained by cutting Figure 7(a) in the WW section.

[0041] Another example of modification is that the edges connecting the periphery edges 212 of the busbar may be curved. For example, as shown in Figure 9(a), by making the upper periphery edge 213 an upward-convex curve and positioning the point of maximum height directly above the projection 22, it becomes easier to guide the rope R, etc., directly above the projection 22, thereby improving handling performance. Also, by making the lower periphery edge 214 a curve that rises above where the projection 22 is provided at the upper end, the strength of the connection part with the projection 22 is increased, and the effective height of the projection 22 is raised, preventing unintended detachment of the rope, etc. The periphery up to the projection 22 becomes smoother, improving rope handling performance.

[0042] On the other hand, by making the lower peripheral edge 214 a downward-convex curve as shown in Figure 9(b), the rope R, etc., is supported at the corner between the lower end of the projection 22 and the lower peripheral edge 214, fixing the mounting position and making it less likely to come off unintentionally. Furthermore, by adopting this configuration for the sub-peripheral edge 31, the mounting position of the rod S can be temporarily fixed to the lower end of the lower edge, improving usability.

[0043] Another example of modification is the presence of an upper end opening 5 corresponding to an indicator light P having a locking projection P1, as shown in Figure 10. In this modification, the upper end opening 5 protrudes inward from the main body 1 and has a notch 51 in part that corresponds to the locking projection P1. Figure 10(a) is a schematic perspective view when attempting to insert the indicator light P, and Figure 10(b) is a cross-sectional view of the SS section.

[0044] In this modified example, the inner circumferential surface of the upper end opening 5 protrudes inward from the main body 1 by at least the height of the locking projection P1, within a range of a predetermined distance (4 mm to 8 mm in this embodiment) from the upper end. The notch 51 is the area of ​​the upper end opening 5 that appears notched because no protrusion is provided, and it is at least wider than the width of the locking projection P1, allowing the locking projection P1 to be inserted from here. The user inserts the indicator light P by aligning the notch 51 with the locking projection P1, and then rotates it until the two are no longer aligned. This causes the protrusion and the locking projection P1 to interfere with each other, making it difficult for the indicator light P to come out unintentionally.

[0045] Furthermore, the penetration section 2 has a first penetration section 2A provided on the main body 1 and a second penetration section 2B opposite the first penetration section 2A. Each penetration section 2 has a projection 22, which allows multiple projections 22 to be used simultaneously, thereby improving usability. In particular, the first penetration section 2A and the second penetration section 2B are opposite each other and are provided so as to overlap when viewed from the front, making it easy to use ropes R, etc., to pass through the main body 1.

[0046] Furthermore, the projection 22 is integrally provided with the main body 1 and is a flat plate extending parallel to the generatrix direction of the main body 1 from the peripheral edge 211, thereby increasing the strength without creating steps in the contour of the main body 1.

[0047] Furthermore, the projection 22 is positioned at an angle to the central axis of the main body 1, making it less likely for ropes R or other items attached to the projection 22 to come off unintentionally.

[0048] Furthermore, the main body 1 is further equipped with a secondary penetration section 3 adjacent to the main penetration section 2, which penetrates both the inside and outside of the main body 1. The secondary penetration section 3 has a smooth inner periphery around its entire circumference, allowing ropes R and the like to move freely within the secondary penetration section 3. This allows for use in various configurations in combination with the main penetration section 2.

[0049] Furthermore, the peripheral portion 21 is composed of four or more peripheral edges 211, and a pair of opposing edges among the peripheral edges 211 are provided parallel to the generatrix of the main body 1. This allows the strength around the through portion 2 to be maintained without changing the ratio of the hole to the main body 1 in the cross-section depending on the height of the main body 1. This effect is particularly advantageous when multiple through portions 2 and sub-through portions 3 are provided.

[0050] Furthermore, a reflective portion 4 is provided on the surface of the main body 1, and the reflective portion 4 is positioned below the through portion 2 in the axial direction of the main body 1. By positioning the reflective portion 4 so as not to overlap with the through portion 2 in this way, visibility can be improved. [Explanation of symbols]

[0051] X indicator 1 Main unit 2 Penetration 2A First penetration part 2B Second penetration part 21 Peripheral area 211 Periphery 212 Perimeter of busbar 213 Upper peripheral edge 214 Lower peripheral edge 22 Protrusion 221 Projection hole 3. Sub-penetration section 3A First sub-penetration part 3B Second sub-penetration part 31 Sub-periphery 4 Reflector 41 Upper reflector 42 Lower reflector 5 Top opening 51 Notches 6. Ventilation section 7 Bottom part 70 Bottom section of the main body 71 Rib P indicator light P1 Locking protrusion C chain R Rope S bar B bolt

Claims

1. It comprises a cylindrical body and a through-hole that penetrates the inside and outside of the body, The through portion has a peripheral portion that forms the periphery of the hole, and a projection that protrudes from the peripheral portion toward the center of the hole. The aforementioned peripheral portion includes a straight or curved peripheral edge, The aforementioned projection is a display unit that protrudes away from both ends of the peripheral edge.

2. The aforementioned through portion has a first through portion provided on the main body and a second through portion opposite to the first through portion. Each of the aforementioned through-holes has the aforementioned projection, as described in claim 1.

3. The display device according to claim 1, wherein the projection is integrally provided with the main body and is a flat plate extending parallel to the generatrix direction of the main body from the peripheral edge.

4. The display device according to claim 1, wherein the projection is provided at an inclination with respect to the central axis of the main body.

5. The main body further comprises a secondary penetration portion adjacent to the aforementioned penetration portion, which penetrates both the inside and outside of the main body. The indicator according to claim 1, wherein the secondary penetrating portion has an inner periphery that is smooth around its entire circumference.

6. The aforementioned peripheral portion is composed of four or more peripheral edges, The display device according to claim 1, wherein a pair of opposing edges among the peripheral edges are provided parallel to the generatrix of the main body.

7. A reflective surface is provided on the surface of the main body. The display device according to claim 1, wherein the reflective portion is provided below the through portion in the axial direction of the main body.

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