Indicator Lights

Abstract

To provide an indicator light that prevents damage to the indicator light and a bolt even if an inner wall of an insertion hole is deformed toward the bolt due to thermal expansion.SOLUTION: An indicator light 1 is attached to a disaster prevention device by inserting a stud provided in a mounted portion on the disaster prevention device side into an insertion hole 4a provided in a mounting portion 4 on the indicator light 1 side, and an inner wall 4b of the insertion hole 4a is provided with a convex portion 4c that is convex inwardly. The inner wall 4b of the insertion hole 4a is provided with a concave portion 4d in an arrangement adjacent to a convex portion 4c in the circumferential direction of the insertion hole 4a.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] This invention relates to an indicator lamp for position indication provided in disaster prevention equipment.

Background Art

[0002] For example, various disaster prevention equipment such as emergency warning equipment, automatic fire alarm equipment, and fire hydrant equipment are provided with indicator lamps for position indication. The indicator lamp is often fixed and attached to the front surface of the housing of the disaster prevention equipment or the like by bolts or nuts (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a fixing structure using bolts and nuts, there is a structure in which the bolts provided on the disaster prevention equipment side are inserted into the insertion holes provided on the indicator lamp side and fixed with nuts. In that case, the bolts on the disaster prevention equipment side may be made of metal, and the insertion holes on the indicator lamp side may be made of resin.

[0005] The indicator lamp is also attached to disaster prevention equipment provided under conditions where the fluctuation range of the environmental temperature is large, such as a fire hydrant device installed in a road tunnel. After fastening and fixing with nuts, due to the rise in environmental temperature, the bolts and the insertion holes may thermally expand. At that time, if the bolts are made of metal and the insertion holes are made of resin, due to the difference in the thermal expansion coefficients of the metal bolts and the resin insertion holes, the resin insertion holes will deform more greatly. When the inner wall portion of the insertion hole facing the bolt side deforms toward the bolt side, it will strongly contact the bolt. Therefore, there is a possibility that damage such as deformation or cracking may occur in the peripheral portion of the insertion hole of the main body or cover of the indicator lamp, or damage such as breakage may occur in the bolts.

[0006] In view of the above circumstances, this invention aims to provide an indicator light that can prevent damage to the indicator light and bolt even if the inner wall of the insertion hole deforms toward the bolt due to thermal expansion. [Means for solving the problem]

[0007] This invention relates to the mounting portion on the disaster prevention equipment side. Welded to be established Stud An indicator light that is attached to a disaster prevention device by inserting a bolt through an insertion hole provided in the mounting part on the indicator light side, wherein the inner wall of the insertion hole is provided with an inwardly convex protrusion. The protrusion, together with the inner wall, deforms due to thermal expansion and, when it comes into contact with the stud bolt, deforms in a way that allows it to move away from the stud bolt. This is an indicator light characterized by the following:

[0008] In this invention, the inner wall of the through hole may be provided with recesses arranged adjacent to the protrusions in the circumferential direction of the through hole. Furthermore, the inner wall of the through hole may be provided with recesses arranged adjacent to the protrusions in the axial direction of the through hole. In addition, the protrusions may include at least two protrusions located above the left-right centerline and separated by the up-down centerline when viewed from the front of the through hole. Furthermore, the protrusions and recesses may form continuous convex and concave ridges in the circumferential direction of the through hole. Furthermore, the portion of the mounting part that faces the mounting part may be provided with annular protrusions that are continuous or discontinuous in an annular shape and convex toward the mounting part. [Effects of the Invention]

[0009] In this invention, even if the inner wall of the through-hole deforms toward the bolt due to thermal expansion, the protrusions on the inner wall will deform to move away from the bolt when they come into contact with it. Therefore, the contact pressure of the inner wall on the bolt can be reduced, and strong contact between the inner wall and the bolt can be prevented. This prevents damage to the body and cover of the indicator light around the through-hole, and also prevents damage to the bolt.

[0010] Therefore, according to this invention, an indicator light can be obtained that prevents damage to the indicator light and bolt even if the inner wall of the insertion hole deforms toward the bolt due to thermal expansion. [Brief explanation of the drawing]

[0011] [Figure 1] This is an example of an embodiment of the indicator light of the present invention, and is a front view of the front side of the indicator light unit when the convex and concave portions provided on the inner wall of the insertion hole are arranged alternately in the circumferential direction of the insertion hole. [Figure 2] This is a magnified view of section A in Figure 1, showing a magnified view of the front side of the insertion hole. [Figure 3] This is a front view of the mounting area of ​​the disaster prevention equipment to which the indicator light shown in Figure 1 is attached. [Figure 4] Figure 1 is a rear view of the indicator light and the mounting part of the disaster prevention equipment, showing the indicator light attached to the mounting part of the disaster prevention equipment, with the stud on the disaster prevention equipment side inserted into the insertion hole on the indicator light side. [Figure 5] Figure 4 shows a magnified view of section B, specifically the back side of the insertion hole. [Figure 6] Figure 4 shows a cross-sectional view along the CC line, in the direction of the arrow. [Figure 7] This is a magnified view of section D in Figure 6, showing the insertion hole and stud portions in detail. [Figure 8] This is another example of an embodiment of the indicator light of the present invention, showing a cross-sectional view of the insertion hole portion when the convex and concave portions provided on the inner wall of the insertion hole are arranged alternately in the axial direction of the insertion hole. [Modes for carrying out the invention]

[0012] Hereinafter, an example of an embodiment of the indicator light of this invention will be described as indicator light 1 with reference to the drawings.

[0013] In addition, the terms indicating positions and directions such as front, rear (back), top, bottom, left, and right used to describe this invention are in accordance with the positions and directions when the indicator lamp 1 is in the installed state, including those used in the drawings.

[0014] [Overall equipment] The indicator lamp 1 has a cover 2 that emits light using a light-emitting element such as an LED as a light source, and a main body 3 to which the cover 2 is attached at the front and in which various components such as the light-emitting element and circuit board are incorporated (see FIGS. 1, 3, and 6).

[0015] And the indicator lamp 1 is provided, for example, on the front surface of the housing of various disaster prevention equipment and disaster prevention devices such as emergency warning equipment, automatic fire alarm equipment, fire hydrant equipment, transmitters, etc., in a state where the cover 2 faces forward and is exposed. The cover 2 is constantly lit to indicate the positions of various disaster prevention devices.

[0016] [Mounting part (indicator lamp side)] On the main body 3, a mounting part 4 that is plate-shaped and has a flange shape is provided on the outer peripheral part (see FIGS. 1, 4, and 6). The mounting part 4 is formed of a resin material together with the main body 3 (for example, formed by injection molding).

[0017] [Insertion hole] In the mounting part 4, an insertion hole 4a through which a stud 11 (an example of a bolt) provided on the back surface side of the mounting part 10 on the disaster prevention equipment side to which the indicator lamp 1 is attached is inserted is provided (see FIGS. 1, 2, 4, and 5). The insertion hole 4a is circular in a front view (see FIGS. 1, 2, 4, and 5) and is provided so as to penetrate in the thickness direction (front-rear direction) of the mounting part 4 (see FIGS. 6 and 7). Note that the shape of the insertion hole 4a in a front view is not limited to a circular shape and can be other shapes.

[0018] [Mounting part (disaster prevention equipment side)] The mounting portion 10 to which the indicator light 1 is attached is provided with an opening 12 that exposes the cover 2 of the indicator light 1 to the outside (see Figure 3), and the aforementioned stud 11 is provided on the back side (see Figures 4 to 7). The mounting portion 10 and the stud 11 are made of metal material, and the stud 11 is provided upright on the back side of the mounting portion 10 by welding (see Figures 6 and 7). As the mounting portion 10, for example, if the disaster prevention equipment is a fire hydrant device, it can be a plate body such as a door provided on the front of its housing.

[0019] [Mounting structure] The indicator light 1 is attached to the disaster prevention equipment by inserting the stud 11 on the back side of the mounting part 10 into the insertion hole 4a from the front side of the mounting part 4, with the front side of the indicator light 1, i.e., the cover 2 side, facing the back side of the mounting part 10 on the disaster prevention equipment side, and while exposing the cover 2 to the outside through the opening 12 provided in the mounting part 10, a nut (not shown) is screwed onto the stud 11 that has penetrated the back side of the mounting part 4 from the back side of the mounting part 4, and the mounting part 4 is sandwiched between the back side of the mounting part 10, and then tightened and fixed with the nut (see Figures 6 and 7).

[0020] [Protrusions on the inner wall of the insertion hole] The insertion hole 4a is provided with a convex portion 4c on the inner wall 4b that is convex on the inner circumference side (see Figures 1, 2, 4, and 5).

[0021] In the indicator light 1, by providing a protrusion 4c, even if the inner wall 4b of the resin insertion hole 4a expands due to heat, including the protrusion 4c, and deforms significantly toward the inner stud 11, when the protrusion 4c comes into contact with the stud 11, the protrusion 4c of the thermally expanded resin insertion hole 4a will deform so as to move away from the stud 11. Therefore, the contact pressure of the protrusion 4c on the stud 11 can be reduced, and the protrusion 4c can not come into strong contact with the stud 11. As a result, damage to the area around the insertion hole 4a of the main body 3 and cover 2 can be prevented, and damage to the stud 11 can also be prevented. In other words, damage to the indicator light 1 and the stud 11 can be prevented.

[0022] [Recess in the inner wall of the insertion hole] By providing the aforementioned protrusion 4c, a recess 4d is formed on the inner wall 4b of the through hole 4a at a position adjacent to the protrusion 4c (see Figures 1, 2, 4, and 5). Specifically, when the protrusion 4c deforms to move away from the stud 11, it deforms to move towards the adjacent recess 4d.

[0023] [Specific examples of irregularities on the inner wall of the insertion hole (Examples in Figures 1, 2, 4 to 7)] ·Alternate circumferential arrangement Multiple protrusions 4c can be provided at intervals in the circumferential direction of the insertion hole 4a, and multiple recesses 4d can be provided adjacent to each protrusion 4c on either side in the circumferential direction. In other words, multiple protrusions 4c and recesses 4d can be provided on the inner wall 4b in an alternating arrangement in the circumferential direction of the insertion hole 4a.

[0024] The convex portion 4c and concave portion 4d shown in Figures 1, 2, 4 to 7 are examples of how they may be provided.

[0025] • Number of protrusions and recesses Even if at least one protrusion 4c is provided, it can prevent it from making strong contact with the stud 11 even if it deforms due to thermal expansion, thus functioning to prevent damage to the area around the insertion hole 4a and the stud 11. However, it is preferable to have multiple protrusions and recesses 4d.

[0026] The illustrated example shows a case where there are four protrusions 4c and four recesses 4d, but the number can be increased or decreased as appropriate depending on the size and shape of the through hole 4a.

[0027] • Opening width of the recess (distance between protrusions) The opening width (circumferential width) of the inner (stud 11 side) opening of the recess 4d is preferably such that the stud 11 does not enter the recess 4d and the inner wall 4b does not come into direct contact with the stud 11.

[0028] • Shape, size, and arrangement of the protrusions, etc. The shape, size, and arrangement of the protrusions 4c can be uniform. In the illustrated example, the multiple protrusions 4c are all the same shape and size, protruding radially from the insertion hole 4a, and are arranged at equal angular intervals in the circumferential direction.

[0029] • Thickness of the protrusion The thickness of the protrusion 4c can be the same as the total height of the inner wall 4b of the through hole 4a (the total depth of the through hole 4a) (see Figures 6 and 7). It can also be smaller than the total height of the inner wall 4b of the through hole 4a. In that case, the protrusion 4c will have a recess provided adjacent to it in the axial direction of the through hole 4a (see, for example, the protrusion 4g and recess 4h in Figure 8).

[0030] • Bolt positioning function using protrusions The multiple protrusions 4c can also be used as positioning members for the stud 11 when mounting the indicator light 1, by bringing their tip surfaces 4e into contact with the outer circumferential surface of the stud 11.

[0031] By determining the position of the stud 11 within the insertion hole 4a, the positional relationship between the cover 2 of the indicator light 1 and the opening 12 of the mounting part 10 can be standardized, reducing individual differences. As a result, the dimensions of the two can be made closer, reducing the gap between them and preventing water, dust, etc. from entering through the gap.

[0032] • Shape of the tip surface of the protrusion The tip surface 4e of the protrusion 4c is preferably shaped to facilitate the insertion of the stud 11, at least on the inlet side of the insertion of the stud 11. In the illustrated example, the inlet side of the insertion is given a radius (see Figure 2), thereby facilitating the insertion of the stud 11.

[0033] Furthermore, the tip surface 4e of the protrusion 4c can be shaped to incline toward the stud 11 as it progresses in the insertion direction of the stud 11 (from the entrance side to the exit side of insertion) (see Figures 6 and 7). More specifically, for example, the tip surface 4e can be shaped to incline toward the stud 11 as it progresses in the insertion direction of the stud 11, moving from a state of being separated from the outer surface of the stud 11 to a state of being in contact with it. By doing so, at the entrance side of insertion, the space between the tip surface 4e and the stud 11 can be widened to facilitate the insertion of the stud 11 into the insertion hole 4a, while at the exit side of insertion, the tip surface 4e and the stud 11 can be brought into contact to determine the position of the stud 11.

[0034] Furthermore, the inclined shape of the tip surface 4e can be used as a draft angle during molding of the indicator light body 3, which is made of resin including the mounting portion 4, but it can be made to be more inclined than other inclined portions that are provided as draft angles. By doing so, the contact area between the tip surface 4e and the stud 11 can be reduced. It is thought that the protrusion 4c and the stud 11 may get caught due to mounting errors of the stud 11, positional errors of the insertion hole 4a, molding dimensional errors of the protrusion 4c, etc. Originally, the resin protrusion 4c is more easily worn down than the metal stud 11 due to the difference in strength, but by reducing the contact area between the tip surface 4e and the stud 11, it can be made even easier to wear down. Therefore, even if there are mounting errors of the stud 11, positional errors of the insertion hole 4a, molding dimensional errors of the protrusion 4c, etc. as described above, it is possible to easily insert the stud 11 into the insertion hole 4a.

[0035] • Upper left and right arrangement of the protrusions The multiple protrusions 4c may include at least two protrusions 4c that are located above the horizontal center line HL in the left-right direction and on the left and right sides of the vertical center line VL in the up-down direction, i.e., located on the upper left and right sides of the through hole 4a (see Figure 2).

[0036] Here, for example, when attaching the indicator light 1 to a fire hydrant system, if the indicator light 1 is attached to the door while it is still mounted on the fire hydrant system housing, the position of the stud 11 in the insertion hole 4a will be biased upward due to the weight of the indicator light 1. Therefore, if the multiple protrusions 4c are made up of two upper left and right protrusions 4c as described above, only those two protrusions 4c can be made to contact the stud 11. In other words, even if the multiple protrusions 4c are made up of only two upper left and right protrusions 4c as described above, it is possible to prevent damage to the insertion hole 4a and the stud 11.

[0037] Furthermore, as a method for attaching the indicator light 1 to the fire hydrant system, it is also conceivable to attach the indicator light 1 to the door when it is not attached to the fire hydrant system housing. In this case, if the indicator light 1 is attached from above to the door with the back side where the studs 11 are erected facing upwards, the position of the studs 11 within the insertion hole 4a will not be biased by the weight of the indicator light 1.

[0038] [Protrusions around the insertion hole] On the front side of the mounting portion 4 (the side facing the back side of the mounting portion 10 when mounted), around the insertion hole 4a, an annular projection 4f can be provided, which forms an annular shape when viewed from the front and is convex on the back side of the mounting portion 10 (see Figures 1, 2, and 7).

[0039] Here, for example, if the mounting target of the indicator light 1 is a fire hydrant device, and the part to which it is mounted 10 is the door of the fire hydrant device housing, then the distortion of the door itself that occurs when the door is opened and closed may put a load on the indicator light 1, potentially causing damage.

[0040] By providing the aforementioned annular protrusion 4f, the contact surface between the mounting portion 4 and the portion to be mounted 10 can be reduced. This reduces the load caused by the distortion of the door itself when the door of the fire hydrant housing on which the portion to be mounted 10 is installed is opened and closed, thereby reducing the transmission of the load to the mounting portion 4 of the indicator light 1 and preventing damage to the indicator light 1.

[0041] The annular shape of the annular protrusion 4f can be a single protrusion that continues in an annular shape, as shown in the illustrated example, or it can be a configuration in which multiple divided protrusions are arranged intermittently in an annular shape. In the illustrated example, it is shown as an annular shape, but it is not limited to this, and other shapes are acceptable as long as they form an annular shape.

[0042] The protrusion of the annular projection 4f can be, for example, about 1 mm or less. When the annular projection 4f is provided, a gap is formed between the back surface of the mounting part 10 and the front surface of the mounting part 4 by the width of the protrusion (see Figure 7). This gap becomes a passage for water, dust, etc. to enter the interior, so it is preferable that it be narrow. By making the protrusion of the annular projection 4f about 1 mm or less, the gap can be narrowed accordingly, and water, dust, etc. can be prevented from entering the interior.

[0043] More specifically, the protrusion of the annular projection 4f can be, for example, about 0.25 mm. The annular projection 4f will be molded from resin material together with the mounting part 4, etc., but when molded by injection molding, for example, if the wall thickness is constant, the fluidity of the resin is better and molding defects (such as appearance defects) are less likely to occur. If the protrusion of the annular projection 4f is small, about 0.25 mm, the fluidity of the resin can be prevented from becoming so poor that it causes molding defects. In other words, molding defects can be prevented.

[0044] [Another example of irregularities on the inner wall of the insertion hole (Example in Figure 8)] ·Axis alternating arrangement Instead of having convex portions 4c and concave portions 4d arranged adjacently in the circumferential direction as the irregularities on the inner wall 4b of the insertion hole 4a, the irregularities can also be arranged adjacently in the axial direction (front-to-back direction) of the insertion hole 4a.

[0045] Figure 8 shows a longitudinal cross-section of the insertion hole 4a, illustrating an example of how the irregularities of the inner wall 4b can be arranged.

[0046] As shown in the figure, the inner wall 4b of the through hole 4a is provided with a protrusion 4g and a recess 4h arranged adjacent to each other in the axial direction of the through hole 4a.

[0047] As a result, even if the protrusion 4g deforms due to thermal expansion and comes into contact with the stud 11, the protrusion 4g will deform to escape toward the adjacent recess 4h, thereby reducing the contact pressure of the protrusion 4g on the stud 11 and preventing the protrusion 4g from making strong contact with the stud 11. In other words, the protrusion 4g and recess 4h prevent damage to the area around the insertion hole 4a of the main body 3 and cover 2, and also prevent damage to the stud 11.

[0048] Although not shown in the illustration, the circumferential shapes of the convex portion 4g and concave portion 4h can be continuous or intermittent convex and concave ridges extending around the entire circumference.

[0049] Furthermore, the shape of the protrusion 4g is preferably such that it facilitates the insertion of the stud 11. In the illustrated example, the end edge portion 4ga on the insertion side is given a rounded shape, thereby facilitating the insertion of the stud 11.

[0050] In the example shown in Figure 8, there is one protrusion 4g in the middle of the axial direction of the insertion hole 4a, and one recess 4h on both the front and rear sides of the protrusion 4g in the axial direction, with recesses 4h located on both the inlet and outlet sides of the insertion. The number and arrangement of the protrusions 4g and recesses 4h arranged alternately in the axial direction are not limited to the example shown.

[0051] For example, the number of recesses can be more or fewer. Also, regarding the arrangement, the recesses 4h may be located on either the inlet side or the outlet side of the insertion. If the recesses 4h are located on one side, it is advantageous to have the recesses 4h on the inlet side of the insertion. That is, on the inlet side of the insertion, the presence of the recesses 4h is advantageous because it facilitates the insertion of the stud 11, and on the outlet side of the insertion, the absence of the recesses 4h is advantageous because it allows for better seating of the nut.

[0052] [Example of configuration changes] While embodiments of this invention have been described above with reference to Figures 1 to 8, the specific configuration is not limited to the embodiments described above, and may include design modifications and the like that do not depart from the spirit of this invention.

[0053] For example, the tip surface 4e of the protrusion 4c of the through hole 4a has a slightly curved, rounded shape, but it may be chamfered instead. [Explanation of symbols]

[0054] 1: Indicator light 2: Cover 3: Main body 4: Mounting part 4a: Through hole 4b: Inner wall 4c: Protrusion 4d: Recess 4e: Tip surface 4f: Annular protrusion 4g: protruding part 4ga: edge part 4h: recessed part 10: mounting part 11: stud 12:Aperture

Claims

1. An indicator light is attached to a disaster prevention device by inserting a stud bolt, which is welded to the mounting part on the disaster prevention device side, into an insertion hole provided in the mounting part on the indicator light side, The inner wall of the aforementioned insertion hole is provided with a protrusion that is convex inward, The indicator light is characterized in that the protrusion, together with the inner wall, deforms due to thermal expansion and comes into contact with the stud bolt, and then deforms to move away from the stud bolt.

2. The indicator light according to claim 1, characterized in that a recess is provided on the inner wall of the insertion hole in an arrangement adjacent to the protrusion in the circumferential direction of the insertion hole.

3. The indicator light according to claim 1, characterized in that a recess is provided on the inner wall of the insertion hole in an arrangement adjacent to the protrusion in the axial direction of the insertion hole.

4. The indicator light according to claim 2, characterized in that the protrusion is located above the left-right center line in a front view of the insertion hole and includes at least two protrusions located to the left and right with the up-down center line in between.

5. The indicator light according to any one of claims 1 to 4, characterized in that the portion of the mounting portion that faces the portion to be mounted has an annular projection that is continuous or discontinuous in an annular shape and is convex toward the portion to be mounted.

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