Water heater

Abstract

To provide a water heater that can prevent an indicator portion from coming off from a body part of an operation dial.SOLUTION: An indicator pin 20 is pushed into an engagement hole 15 provided in a body part 10 of an operation dial 5 from the side of leg part 22, 23. In turn, external surfaces 331, 431 of enlarged diameter parts 33, 42 of bulge parts 32, 43 of the leg parts 22, 23 abut on an inner edge part of an inner flange part 55. Along with this, the leg parts 22, 23 are elastically displaced in inner directions P1, P2. When the bulge parts 32, 42 pass a through hole 56 and a rear face 211 of a head part 21 abuts on a step part 52 of the engagement hole 15, the leg parts 22, 23 are restored so as to separate from each other in outer directions P3, P4, and contracted diameter parts 34, 44 of the bulge parts 32, 42 are locked to the rear face of the inner flange part 55.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a water heater. [Background technology]

[0002] Conventionally, small water heaters have been known in which the flow rate of hot and cold water can be adjusted by rotating an operating dial (see, for example, Patent Document 1). The outer periphery of the front part of the operating dial has a recess to indicate the rotation position, and the user adjusts the flow rate using this recess as an index. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-74761 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned operation dial has a problem in that the recess is hidden in the shadow, making it difficult to see. To solve this problem, it is possible to make the operation dial a two-part structure consisting of a main body of the operation dial and a colored display part, and to fix the display part to the main body of the operation dial, but there is a possibility that the display part will fall off the main body.

[0005] An object of the present invention is to provide a water heater that can prevent a display unit from falling off from a main body of an operating dial. [Means for solving the problem]

[0006] The water heater of claim 1 is a water heater equipped with an operation dial that adjusts the water flow rate by being rotated, wherein the operation dial comprises a main body and a display fixed to the main body, and the display comprises a plate-shaped head having a front surface visible to a user, and a pair of legs extending rearward from a rear surface of the head in parallel and spaced apart relation to each other, the legs being configured to be elastically displaceable inward in a direction in which the pair of legs approach each other, and a rear end of the leg body the bulging portion has an enlarged diameter portion in which the outer surface, which is the surface opposite to the inward direction, gradually widens outward as it moves from the rear end to the front side, and a reduced diameter portion that narrows toward the leg main body side on the front side of the widest part of the enlarged diameter portion, which is the widest part of the enlarged diameter portion; the main body is provided with a fitting hole into which the display unit fits from the front, the fitting hole having a large diameter portion extending rearward from the front surface of the main body, and a large diameter portion extending from the rear end of the large diameter portion toward the inside in the radial direction of the large diameter portion and a step portion that abuts against the rear surface of the head portion from the rear, a small diameter portion that extends rearward from the inner end of the step portion, and an inner flange portion that extends from the rear end of the small diameter portion toward the inside in the radial direction of the small diameter portion and has a through hole formed in its center, and the inner diameter R of the through hole is larger than the distance L1 between the outer surfaces of the rear ends of the enlarged diameter portions of the pair of legs and smaller than the distance L2 between the outer surfaces of the most enlarged portions, while the length L3 of the leg body is When the display unit is pushed into the fitting hole from the leg side, the outer surface of the enlarged diameter portion abuts against the inner edge of the inner flange portion, causing the pair of legs to elastically displace inward, so that the bulge passes through the through hole, and when the rear surface of the head abuts against the step portion, the pair of legs return to their original position so that they move apart in the outward direction opposite to the inward direction, and the reduced diameter portion of the bulge engages with the rear surface of the inner flange portion.

[0007] The outer surface of the pair of legs of the water heater of claim 2 may have a protrusion that protrudes outward, or a protruding portion that protrudes outward and extends circumferentially around the through hole, formed on the portion that faces the through hole when the display unit is fitted into the fitting hole portion. [Effects of the Invention]

[0008] According to the water heater of claim 1, the above configuration allows the display unit to be easily fitted into the fitting hole. Also, since the rear surface of the head abuts the step portion while the reduced diameter portion of the display unit engages with the inner flange portion, the water heater can prevent the display unit from falling out of the fitting hole.

[0009] According to the water heater of claim 2, when the display unit is fitted into the fitting hole, the protrusions or protruding portions on the outer surfaces of the pair of legs are positioned in opposing positions within the through-hole and come into contact with the inner edge of the inner flange. As a result, the leg bodies of the pair of legs are slightly biased inward, and the elastic restoring force of each of these leg bodies presses the leg bodies against the inner edge of the inner flange. This prevents the display unit from rattling in the fitting hole, more effectively preventing the display unit from falling out of the fitting hole. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a water heater 1. [Figure 2] FIG. [Figure 3] FIG. 2 is an exploded perspective view of the operation dial 5. [Figure 4] FIG. 2 is a perspective view of the indicator pin 20. [Figure 5] FIG. 2 is a side view of the indicator pin 20. [Figure 6] 1 is a side view of the indicator pin 20 as seen from the leg 22 side. [Figure 7] FIG. 2 is a cross-sectional view of the periphery of a fitting hole 15. [Figure 8] 10 is a cross-sectional view of the display pin 20 and the fitting hole 15 and its surroundings. FIG. [Figure 9] FIG. 10 is a side view of the indicator pin 200 (modified example) as viewed from the leg portion 22 side. [Figure 10] 10 is a cross-sectional view of the display pin 300 (modified example) and the fitting hole 15 and its surroundings. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described below. Unless otherwise specified, the devices, component configurations, etc. described below are not intended to be limiting and are merely illustrative examples. The drawings are used to explain technical features that may be adopted by the present invention. In this embodiment, the front-to-back, left-to-right, and up-to-down directions shown in the drawings will be used for explanation. Furthermore, the scales of the drawings do not necessarily match each other, and the drawings are enlarged or reduced as appropriate depending on the objects shown.

[0012] The configuration of a water heater 1 will be described with reference to Figure 1. The water heater 1 shown in Figure 1 is attached to, for example, a wall at the back front of a kitchen sink. The water heater 1 comprises a main body 2. A main burner (not shown) is provided inside the main body 2. A shower head 4 is connected to the bottom of the main body 2 via a flexible hot water outlet pipe 3. A seesaw-operated selector switch 7 is provided on the front of the shower head 4. Either straight water or shower water is sprayed from the shower head 4 by operating the selector switch 7.

[0013] An operation dial 5 is provided in the center of the lower front of the main body 2. Pressing the operation dial 5 causes hot water to dispense from the shower head 4 and the main burner to ignite, and pressing it again stops hot water from dispensing from the shower head 4 and extinguishes the main burner. The temperature of the hot water that is dispensed can also be adjusted by rotating the operation dial 5. A separate indicator pin 20 is fixed to the front of the operation dial 5. The user can determine the temperature of the hot water that is dispensed by checking the rotation position of the operation dial 5 using the position of the indicator pin 20 as an indicator.

[0014] The configuration of the operation dial 5 will be described with reference to Figures 2 and 3. In this embodiment, for the sake of convenience, the configuration of the operation dial 5 will be described in the orientation in which it is attached to the main body 2 of the water heater 1. The operation dial 5 includes a main body 10 and a display pin 20.

[0015] As shown in FIG. 3, the main body 10 is made of, for example, white resin, and is a short-axis, approximately cylindrical shape with a bottom. The main body 10 includes a front plate 11 and a peripheral wall 12. The front plate 11 is approximately circular when viewed from the front. The front surface of the front plate 11 gently bulges forward in an approximately arc-shaped cross section. A circular fitting hole 15 is provided at a predetermined position on the outer periphery of the front surface of the front plate 11. An indicator pin 20 is fitted into and fixed in the fitting hole 15. A plurality of anti-slip portions 13 are provided at equal intervals in the circumferential direction on the outer periphery of the peripheral wall 12. The anti-slip portions 13 are, for example, composed of three linear ribs lined up, and have the function of preventing slippage when the operation dial 5 is turned.

[0016] The structure of the indicator pin 20 will be described with reference to Figures 4 and 5. The indicator pin 20 is made of, for example, gray resin, and is preferably a color different from the color of the main body 10 of the operation dial 5. The indicator pin 20 has a head 21 and a pair of legs 22, 23. The head 21 is disk-shaped with a predetermined thickness and has a front surface 210 that is visible to the user. The front surface 210 is flat.

[0017] The pair of legs 22, 23 extend parallel to and spaced apart from each other rearward from the rear surface 211 of the head 21. The legs 22, 23 are symmetrical to each other with respect to the center line O of the indicator pin 20.

[0018] One leg 22 has a leg main body 31 and a bulge 32. A flat surface 26 is provided on the portion of the leg 22 facing the leg 23. The flat surface 26 is parallel to the center line O. The leg main body 31 extends rearward from the rear surface 211 of the head 21. A cross section perpendicular to the longitudinal direction of the leg main body 31 is approximately semicircular. The leg main body 31 can be elastically displaced in an inward direction P1 (see Figure 5) when subjected to an external force. The inward direction P1 is the direction approaching the leg 23 side.

[0019] The bulging portion 32 is provided at the rear end of the leg main body 31 and bulges outward opposite the leg 23 side. The bulging portion 32 has an expanded diameter portion 33 and a reduced diameter portion 34. The expanded diameter portion 33 is a portion where the outer surface 331 gradually expands outward from the rear end toward the front. The outer surface 331 is a surface excluding the flat surface 26. The rear end of the expanded diameter portion 33 is the most expanded portion 332. The most expanded portion 332 is the portion of the expanded diameter portion 33 that expands most in the outward direction P3. The reduced diameter portion 34 is a portion that is forward of the most expanded portion 332 and narrows toward the leg main body 31.

[0020] In such a leg 22, a protrusion 35 is provided at the rear end of the outer surface 311 of the leg main body 31. The protrusion 35 protrudes outward and is provided along the circumferential direction of the outer surface 311 (see FIG. 6). The outer peripheral surface of the protrusion 35 is parallel to the center line O. Also, as shown in FIG. 6, when the indicator pin 20 is viewed from the leg 22 side, a pair of flat surfaces 36, 37 are provided on both sides in the width direction of the leg 22, respectively, from the front end of the leg main body 31 to the rear end side of the expanded diameter portion 33 of the bulge portion 32. The flat surfaces 36, 37 are parallel to the front-to-rear direction.

[0021] The other leg 23 has a symmetrical shape to the leg 22 with respect to the center line O. The leg 23 comprises a leg main body 41 and a bulge 42. A flat surface 27 is provided on the portion of the leg 23 facing the leg 22. The flat surface 27 is also parallel to the center line O. The leg main body 41 extends rearward from the rear surface 211 of the head 21. The leg main body 41 can be elastically displaced in an inward direction P2 (see Figure 5) when subjected to an external force. The inward direction P2 is a direction approaching the leg 22 side.

[0022] The bulging portion 42 is provided at the rear end of the leg main body 41 and bulges outward opposite the leg 22 side. The bulging portion 42 has an expanded diameter portion 43 and a reduced diameter portion 44. The expanded diameter portion 43 is a portion where the outer surface 431 gradually expands outward as it moves from the rear end to the front. The outer surface 431 is a surface excluding the flat surface 27. The rear end of the expanded diameter portion 43 is the most expanded portion 432. The most expanded portion 432 is the portion of the expanded diameter portion 43 that expands most outward. The reduced diameter portion 44 is a portion that is forward of the most expanded portion 432 and narrows toward the leg main body 41.

[0023] In this leg 23, as in the leg 22, a protrusion 45 is provided at the rear end of the outer surface 411 of the leg main body 41. The protrusion 45 protrudes outward and is provided along the circumferential direction of the leg main body 41. The outer peripheral surface of the protrusion 45 is also parallel to the center line O. When the indicator pin 20 is viewed from the leg 23 side, a pair of flat surfaces 46 (only one flat surface 46 is shown) is provided on both sides in the width direction of the leg 23, extending from the front end of the leg main body 41 to the rear end side of the expanded diameter portion 43 of the bulge portion 42. The pair of flat surfaces 46 are also parallel to the front-to-rear direction.

[0024] In this embodiment, in the indicator pin 20 having the above configuration, the distance between the outer surfaces 331, 431 of the expanded diameter portions 33, 43 of the pair of legs 22, 23 that are closer to the rear end than the most expanded portions 332, 432 is defined as L1. The distance between the outer surfaces 331, 431 at the most expanded portions 332, 432 is defined as L2. The length of the leg main bodies 31, 41 is defined as L3.

[0025] The structure of the fitting hole 15 will be described with reference to Figure 7. The fitting hole 15 includes, in order from the front plate 11 side of the main body 10 to the rear side, a large diameter portion 51, a step portion 52, a small diameter portion 53, and an inner flange portion 55. The large diameter portion 51 is generally cylindrical and extends rearward from the front surface of the front plate 11. The step portion 52 is generally ring-shaped in front view and extends radially inward from the rear end of the large diameter portion 51. The small diameter portion 53 is generally cylindrical and extends rearward from the inner end of the step portion 52, and has a smaller diameter than the large diameter portion 51.

[0026] The inner flange portion 55 protrudes radially inward from the rear end of the small diameter portion 53 and has a through hole 56 in its center. The through hole 56 is circular in front view. A tapered portion 54 is provided at the front corner of the inner edge of the inner flange portion 55 that forms the through hole 56. The tapered portion 54 slopes radially inward from the small diameter portion 53 toward the rear. In this embodiment, in the fitting hole portion 15 having the above structure, the inner diameter of the through hole 56 is defined as R. The distance from the rear end of the large diameter portion 51 to the rear end of the inner flange portion 55 is defined as D.

[0027] 5, 7, and 8, an example of a method for fitting the indicator pin 20 into the fitting hole 15 will be described. First, the indicator pin 20 shown in FIG. 5 is inserted into the fitting hole 15 shown in FIG. 7, starting with the pair of legs 22, 23, and the front surface of the head 21 is pressed in. Then, the outer surfaces 331, 431 of the enlarged diameter portions 33, 43 of the legs 22, 23 come into contact with the tapered portion 54 of the inner flange 55 and slide rearward relative to the inner edge of the inner flange 55. As a result, the bulges 32, 42 are subjected to external forces inwardly from the outside P1, P2. As a result, the leg body 31 of the leg 22 is elastically displaced inwardly in the P1 direction, and the leg body 41 of the leg 23 is elastically displaced inwardly in the P2 direction. Therefore, the bulges 32, 42 can pass through the through hole 56 rearward.

[0028] Next, as the reduced diameter portions 34, 44 slide against the rear end of the inner edge of the inner flange portion 55, the leg body 31 of the leg portion 22 elastically displaces in the outward direction P3, and the leg body 41 of the leg portion 23 elastically displaces in the outward direction P4. Then, as the reduced diameter portions 34, 44 pass rearward through the through hole 56 of the inner flange portion 55, the leg bodies 31, 41 of the legs 22, 23 simultaneously return to their original shapes. At this time, the rear ends of the reduced diameter portions 34, 44 engage with the rear surface of the inner flange portion 55. At the same time, the rear surface 211 of the head portion 21 of the indicator pin 20 abuts against the stepped portion 52 of the fitting hole 15. The outer peripheral surface 212 of the head portion 21 of the indicator pin 20 contacts the inner peripheral surface of the large diameter portion 51. In this way, the indicator pin 20 is fitted into and fixed in the fitting hole 15.

[0029] As shown in FIG. 8, the inner diameter R of the through hole 56 is larger than the distance L1 between the outer surfaces of the rear ends of the enlarged diameter portions 33, 43 of the pair of legs 22, 23. This allows the bulging portions 32, 42 of the pair of legs 22, 23 to be inserted from the rear end side. Meanwhile, the inner diameter R is smaller than the distance L2 between the outer surfaces of the most enlarged portions 332, 432. This allows the leg bodies 31, 41 to elastically displace inward in the inward directions P1, P2, and the bulging portions 32, 42 to pass rearward through the through hole 56, thereby engaging the bulging portions 32, 42 with the rear end of the inner flange portion 55. This prevents the indicator pin 20 from falling out of the fitting hole 15 of the operation dial 5 in the water heater 1.

[0030] On the other hand, the length L3 of the leg bodies 31, 41 is longer than the distance D from the rear end of the large diameter portion 51 to the rear end of the inner flange portion 55. This allows the bulging portions 32, 42 to be easily locked to the inner flange portion 55 when the indicator pin 20 is inserted and pushed into the fitting hole portion 15.

[0031] Furthermore, when the indicator pin 20 is fitted into the fitting hole 15, the protrusion 35 provided at the rear end of the leg body 31 of the leg 22 is positioned in a corresponding position within the through hole 56 and contacts the rear end portion of the inner edge of the inner flange 55. On the other hand, the protrusion 45 provided at the rear end of the leg body 41 of the leg 23 is also positioned in a corresponding position within the through hole 56 and contacts the rear end portion of the inner edge of the inner flange 55. As a result, the leg body 31 is slightly biased toward the inward direction P1, and the leg body 41 is slightly biased toward the inward direction P2. Therefore, the leg bodies 31, 41 are pressed against the inner edge of the inner flange 55 due to the respective elastic restoring forces of the leg bodies 31, 41. This prevents the indicator pin 20 from rattling relative to the fitting hole 15, more effectively preventing the indicator pin 20 from falling out of the fitting hole 15.

[0032] Furthermore, when the indicator pin 20 is fitted into the fitting hole 15, the main body 10 of the operation dial 5 is white and the indicator pin 20 is gray, making the indicator pin 20 stand out. Furthermore, because the head 21 of the indicator pin 20 is located at the back of the fitting hole 15, it is possible to cast a shadow on the inside of the fitting hole 15 and place the gray head 21 of the indicator pin 20 at the back of the shadow. This further improves the identifiability of the indicator pin 20 as an indicator through the combination of the fitting hole 15 and the indicator pin 20. Furthermore, because the head 21 of the indicator pin 20 does not protrude from the front surface of the front panel 11 of the main body 10, it is possible to prevent the user's finger from getting caught on the head 21 of the indicator pin 20 and causing the indicator pin 20 to fall out when operating the operation dial 5.

[0033] In the above description, the indicator pin 20 is an example of the "indicator" of the present invention.

[0034] As described above, the water heater 1 of this embodiment includes an operation dial 5 that is rotated to adjust the water flow rate. The operation dial 5 includes a main body 10 and an indicator pin 20. The indicator pin 20 is fixed to the main body 10. The indicator pin 20 includes a head 21 and a pair of legs 22, 23. The head 21 is plate-shaped and has a front surface 210 that is visible to the user.

[0035] The pair of legs 22, 23 extend parallel to and spaced apart from each other rearward from the rear surface 211 of the head 21. The leg 22 comprises a leg main body 31 and a bulge 32. The leg main body 31 is elastically displaceable in the inward direction P1. The bulge 32 is provided at the rear end of the leg main body 31. The leg 23 comprises a leg main body 41 and a bulge 42. The leg main body 41 is elastically displaceable in the inward direction P2. The bulge 42 is provided at the rear end of the leg main body 41. The inward directions P1 and P2 are directions in which the pair of legs 22, 23 approach each other.

[0036] The bulging portion 32 includes an expanded diameter portion 33 and a reduced diameter portion 34. The expanded diameter portion 33 has an outer surface 331 that gradually expands outward from the rear end of the bulging portion 32 toward the front. The outer surface 331 is the surface of the expanded diameter portion 33 opposite the inward direction P1. The reduced diameter portion 34 narrows toward the leg main body 31 forward of the most expanded portion 332. The most expanded portion 332 is the widest part of the expanded diameter portion 33.

[0037] A fitting hole 15 is provided in the main body 10 of the operation dial 5. The indicator pin 20 fits into the fitting hole 15 from the front. The fitting hole 15 has a large diameter portion 51, a step portion 52, a small diameter portion 53, and an inner flange portion 55. The large diameter portion 51 extends rearward from the front plate 11 of the main body 10. The step portion 52 extends from the rear end of the large diameter portion 51 toward the radially inner side of the large diameter portion 51. The step portion 52 abuts against the rear surface 211 of the head 21 of the indicator pin 20 from the rear. The small diameter portion 53 extends rearward from the inner end of the step portion 52. The inner flange portion 55 extends from the rear end of the small diameter portion 53 toward the radially inner side of the small diameter portion 53, and has a through hole 56 formed in its center.

[0038] The inner diameter R of the through hole 56 is larger than the distance L1 between the outer surfaces 331, 431 of the rear ends of the enlarged diameter portions 33, 43 of the pair of legs 22, 23. Furthermore, the inner diameter R of the through hole 56 is smaller than the distance L2 between the outer surfaces 331, 431 of the most enlarged portions 332, 432. Meanwhile, the length L3 of the leg bodies 31, 41 is longer than the distance D from the rear end of the enlarged diameter portion 51 to the rear end of the inner flange portion 55.

[0039] In the main body 10 and indicator pin 20 configured as described above, when the indicator pin 20 is pushed into the fitting hole 15 from the leg portions 22, 23 side, the outer surfaces 331, 431 of the enlarged diameter portions 33, 43 abut against the inner edge of the inner flange portion 55, causing the leg portions 22, 23 to elastically displace inward. As a result, when the bulges 32, 42 pass through the through hole 56 and the rear surface 211 of the head 21 abuts against the stepped portion 52, the leg portions 22, 23 return to their original state so as to move away from each other in the outward directions P3, P4, and the reduced diameter portions 34, 44 of the bulges 32, 42 engage with the rear surface of the inner flange portion 55.

[0040] This allows the indicator pin 20 to be easily fitted into the fitting hole 15 in the operation dial 5 of the water heater 1. In addition, since the reduced diameter portions 34, 44 are engaged with the inner flange portion 55, the indicator pin 20 can be prevented from falling off.

[0041] The present invention is not limited to the above embodiment, and various modifications are possible. The operation dial 5 is circular when viewed from the front, but may be other shapes, for example, polygonal. The fitting hole 15 is circular when viewed from the front, but may be other shapes, for example, polygonal, such as elliptical, oval, rhombus, triangle, or square. The shape of the head 21 of the indicator pin 20 can be changed to match the shape of the fitting hole 15.

[0042] The rear end of the outer surface of each of the leg bodies 31, 41 is formed with protrusions 35, 45 that protrude outward and extend circumferentially around the leg bodies 31, 41. However, as long as they protrude outward, they do not have to extend circumferentially around the leg bodies 31, 41. For example, as in the indicator pin 200 (variant) shown in FIG. 9, the rear end of the outer surface of each of the leg bodies 31, 41 is provided with a plurality of protrusions 65 that protrude outward. The plurality of protrusions 65 extend in the front-rear direction and are arranged at equal intervals around the circumference. The plurality of protrusions 65 can also achieve the same effect as the protrusions 35, 45. The protrusions 35, 45 may also be omitted.

[0043] Furthermore, although the outer peripheral surfaces of the protrusions 35, 45 in the above-described embodiment are parallel to the center line O (see FIG. 5), they may be tapered, for example, increasing in diameter toward the rear end. As shown in FIG. 10, protrusions 350, 450 are provided at the rear end of the outer peripheral surfaces of the leg bodies 31, 41 of the display pin 300, which is a modified example. The protrusions 350, 450 protrude outward and extend along the circumferential direction of the leg bodies 31, 41. The outer peripheral surfaces of the protrusions 350, 450 are tapered, increasing in diameter toward the rear end.

[0044] When the indicator pin 300 having such a shape is fitted into the fitting hole 15, the protrusions 350, 450 are arranged at opposing positions within the through hole 56 and come into contact with the rear end portion of the inner edge of the inner flange 55. As a result, as in the above embodiment, the leg bodies 31, 41 are pressed against the inner edge of the inner flange 55 by the elastic restoring forces of the leg bodies 31, 41, respectively.

[0045] The outer peripheral surfaces of the protrusions 350, 450 are tapered, increasing in diameter toward the rear end, so that the rear end portion of the inner edge of the inner flange 55 acts to urge the outer peripheral surfaces of the protrusions 350, 450 rearward. This causes the indicator pin 300 to be pushed rearward into the fitting hole 15, more effectively preventing it from falling out of the fitting hole 15.

[0046] The position of the operation dial 5 on the main body 2 of the water heater 1 is not limited to that in the above embodiment. The position of the fitting hole 15 on the front surface of the front plate 11 of the main body 10 is not limited to that in the above embodiment.

[0047] In the operation dial 5, the color of the main body 10 and the color of the display pin 20 are not limited to those in the above embodiment and can be freely changed. [Explanation of symbols]

[0048] 1 water heater 5 Operation dial 10 Main body 15 Fitting hole 20 display pins 21 Head 22,23 Legs 31 Leg body 32 Bulge 33 Expanded diameter part 34 Reduced diameter part 35 protrusion 41 Leg body 42 Bulge 43 Expanded diameter part 44 Reduced diameter part 45 protrusion 51 Large diameter section 52 Step 53 Small diameter section 55 Inner flange 56 through hole 65 Protrusion 210 Front 211 Rear 311 External surface 331 External surface 332 Widest part 411 External surface 431 External surface 432 Widest part

Claims

1. In a water heater having an operation dial that is rotated to adjust the water flow rate, The operation dial is a main body; a display unit fixed to the main body unit; Equipped with The display unit a head portion having a plate-like front surface that is visible to a user; a pair of legs extending rearward from the rear surface of the head in parallel with and spaced apart from each other; Equipped with The leg portion is a leg body configured to be elastically displaceable inward, i.e., in a direction in which the pair of legs approach each other; a bulge provided at the rear end of the leg body; Equipped with The bulging portion is an expanding diameter portion in which an outer surface, which is a surface opposite to the inward direction, gradually expands outward as the outer surface moves from the rear end to the front side; a reduced diameter portion that narrows toward the leg body on the front side of the widest portion, which is the widest part of the widened diameter portion; Equipped with The main body has a fitting hole into which the display unit fits from the front, The fitting hole portion is a large diameter portion extending rearward from the front surface of the main body portion; a step portion extending from a rear end of the large diameter portion toward a radially inner side of the large diameter portion and abutting against the rear surface of the head portion of the display portion from behind; a small diameter portion extending rearward from an inner end of the stepped portion; an inner flange portion extending from the rear end of the small diameter portion toward the inside in the radial direction of the small diameter portion, the inner flange portion having a through hole formed in the center thereof; Equipped with an inner diameter R of the through hole is larger than a distance L1 between outer surfaces of the rear ends of the enlarged diameter portions of the pair of legs and smaller than a distance L2 between outer surfaces of the most enlarged portions, while a length L3 of the leg body is longer than a distance D from the rear ends of the enlarged diameter portions to the rear end of the inner flange portion, When the display unit is pushed into the fitting hole from the leg side, the outer surface of the enlarged diameter portion abuts against the inner edge of the inner flange portion, causing the pair of legs to elastically displace inward, so that the bulging portion passes through the through hole, and when the rear surface of the head abuts against the step portion, the pair of legs return to their original position so as to move apart in an outward direction opposite to the inward direction, and the reduced diameter portion of the bulging portion engages with the rear surface of the inner flange portion. A water heater characterized by:

2. The outer surfaces of the pair of legs are formed with protrusions that protrude outward or protruding portions that protrude outward and extend along the circumferential direction of the through hole on portions that face the inside of the through hole when the display unit is fitted into the fitting hole portion. The water heater according to claim 1,

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