JP2015075123A - Fixture structure and hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixture structure in which a cover does not drop from a main body and provide a hot water supply device.SOLUTION: A cover is fixed to a main body by using a screw 31 having a shank of which diameter is smaller than a thread hole and formed with a groove longer than its depth between an extremity end side thread part 31a and a base end side thread part 31c. In this case, spaced-apart distances F, F' between the thread holes 21f and 21g on a bracket 21e are defined as E+H'+Ftanθ, E'+H+F'tanθ'<A', where θ,θ' are angles in which the cover 22 can be inclined in respect to the bracket 21e (main body 21), A, A' are sum of a length of the base end side thread part 31c and the groove 31b of the screw 31. With this arrangement as above, even if the cover 22 is inclined in respect to the bracket 21c (main body) while the screw 31 is applied as an axis, the portion near an opening 22f at the front surface 22a of the cover 22 is not spaced apart from the thread hole 21f by more than distances A, A', so that the extremity end side thread part 31a enters the thread hole 21f and is not pulled out of it and the cover 22 is always engaged with the screw 31.

Description

  The present invention relates to a fixing structure and a hot water supply device, and more specifically, a fixing structure for fixing an object to be fixed to a fixing target, and a cover that is fixed to a box covering a pipe extending from the hot water supply device main body. The present invention relates to a water heater.

  In order to hide a plurality of pipes extending from the lower end of the water heater main body, a decorative cover (box) is provided below the water heater. A decorative cover is comprised from the casing comprised from the both sides | surfaces of a decorative cover, and the some beam which fixes these, and the cover which covers the front surface of a casing, for example. When the hot water supply device is installed outdoors, there is a risk that the cover may come off from the decorative cover (casing) and fall due to continuous vibration from wind or the like.

  Thus, for example, in the decorative cover disclosed in Patent Document 1, a protruding piece is provided upward on a beam (a bracket fixed to the beam) installed on the upper part of the casing, and the protruding piece is provided on the upper part of the cover. The cover is hooked on the casing by inserting it into the slit. In addition, a screw hole is provided in a beam (a bracket fixed to the beam) installed in the lower part of the casing. Therefore, the cover is further fixed to the casing by screwing a screw into the screw hole through an opening provided in the lower portion of the cover.

  However, in the fixing structure having the above-described configuration, when the piping cover of the hot water supply apparatus is fixed, the projecting piece provided on the beam upwards impairs the design aesthetics of the entire hot water supply apparatus. Also, once the decorative cover is assembled and the hot water supply body is placed on the cover, the cover interferes with the hot water supply body, so that even if the screw is removed, the cover will be detached from the decorative cover (casing) and will not fall. Absent. However, even if it is necessary to remove the cover for maintenance of piping, for example, it may be impossible to remove the hot water supply device main body without retreating, which causes inconvenience. In addition, it is conceivable that a construction contractor who performs maintenance of piping or the like cannot remove the cover even if the screws are removed, which may be disturbed and unnecessarily spend construction time.

  In order to cope with the above problem, it is conceivable to make the protruding piece short (for example, the same as the thickness of the cover). However, if it does in this way, a cover will remove | deviate a protrusion piece by the vibration by a wind etc. Even if a drop-off prevention screw is used as the screw, the screw may move beyond the length of the screw itself in the central axis direction, and the entire cover falls.

  In addition, for example, the fixing structure disclosed in Patent Document 2 uses a fixture without providing a fixing structure on the cover, and hooks one end of the fixture to a fixed object and locks the other end with a screw. It is.

  However, the fixing structure having the above-described structure does not have a structure for stabilizing the latching portion, and is a structure used for a fixture with small vibration due to wind or the like, and can be used for a cover with large vibration due to wind or the like. It is not a thing.

JP 2006-3000279 A Japanese Patent Application Laid-Open No. 08-042754

  The present invention provides a fixing structure in which the cover can be easily removed and the cover does not fall from the decorative cover (box), and a hot water supply device that can be used safely using this fixing structure. The task is to do.

  The present invention is a fixing structure for fixing an object to be fixed to a fixing object using a screw, and the object to be fixed includes a first surface provided with a first opening and a second surface provided with a second opening. The first surface and the second surface intersect with each other, and the fixing target has a first screw hole facing the first opening and a second screw hole facing the second opening. A fixing structure, wherein the screw is screwed into the first screw hole through the first opening, and the screw is screwed into the second screw hole through the second opening. It is.

  According to this, since it is fixed by two screws, even if one of the screws is removed, the fixed object will not be detached from the object to be fixed.

  In the fixing structure of the present invention, the screw has a shaft portion having a shaft portion in which a groove portion having a diameter smaller than the screw hole and longer than the depth is formed between the distal end side screw portion and the proximal end side screw portion. It is a screw.

  According to this, the probability that the screw will come off is reduced, and stable fixation is realized.

  In the fixing structure of the present invention, when the groove portion of the screw is engaged with the first screw hole or the second screw hole, the first screw or the second screw is the first screw hole. When the maximum angle that can be tilted with respect to the center axis of the second screw hole or the center axis of the second screw hole is θ, the first surface is inclined by θ on the surface of the fixed object of the first screw hole The length L1 of the second opening from the second screw hole and the first opening when the second surface is inclined by θ on the surface of the second screw hole to be fixed. Both the deviation length L2 from the first screw hole is shorter than the sum (A, A ′) of the lengths of the tip end side screw portion and the groove portion of the screw (L1 <A , L2 <A ′).

According to this, the base end side screw portion of the screw put in the first screw hole is pulled out, and the groove portion engages with the first screw hole, so that the object to be fixed is fixed to the object to be fixed around the screw. Even if it is inclined, the vicinity of the opening of the second surface is not separated from the second screw hole by a distance equal to or greater than the sum (A) of the lengths of the proximal-side screw portion and the groove portion in a direction parallel to the central axis. Thereby, the to-be-fixed object is fixed to the object to be fixed without the tip side screw portion of the screw put in the second screw hole entering the second screw hole and being pulled out.

  In the fixing structure of the present invention, the first surface and the second surface are each provided with a plurality of the first openings and the second openings, and the object to be fixed is the plurality of first openings and second openings. Corresponding to the above, a plurality of first screw holes and second screw holes are provided.

  According to this, a plurality of the above fixing structures can be provided, and more stable fixing is realized.

  Further, the present invention is a hot water supply device main body, the box to be fixed, a box that covers a pipe extending from the hot water supply device main body, and the object to be fixed, and is provided in at least a part of the box. And a cover for closing the opening, wherein the cover is fixed to the box by the fixing structure.

  According to this, the cover does not fall from the box and can be used safely.

  Further, in the hot water supply apparatus of the present invention, the box is disposed under the hot water supply apparatus main body, and there is a portion having a gap between the upper surface of the box body at an end of the lower surface of the hot water supply apparatus main body, The box body to be fixed has the first opening or the second opening at a location facing the gap.

  According to this, by disposing the head of the screw between the hot water supply device main body and the box, the screw can be operated without moving the hot water supply device main body. Further, the appearance of the design is rarely damaged by the head of the screw.

  According to the fixing structure of the present invention, it is possible to easily remove the object to be fixed to the object to be fixed, and the base end side screw portion of the screw placed in the first screw hole is removed, and the groove portion is the first screw. Even if the object to be fixed is tilted with respect to the object to be fixed with the screw as an axis by engaging with the hole, the tip side screw portion of the screw put in the second screw hole may be pulled out from the second screw hole. Therefore, the object to be fixed does not fall out of the object to be fixed and does not fall, and can be used safely.

  Moreover, according to the hot water supply device of the present invention, the cover can be used safely without being dropped from the box by using the fixing structure of the present invention.

Drawing 1 (A) and (B) are the front views and side views showing the whole hot water supply device composition concerning one embodiment, respectively. FIG. 2 is an exploded perspective view showing a schematic configuration of a casing (main body) and a cover constituting the decorative cover. FIG. 3 is a cross-sectional view showing screws and screw holes constituting a fixing structure for fixing the cover to a beam (bracket) provided in the casing (main body). 4A and 4B are a front view and an enlarged view, respectively, showing the overall configuration of the hot water supply apparatus according to one embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a hot water supply apparatus 1 according to this embodiment. The hot water supply device 1 includes a hot water supply device main body 10 and a decorative cover 20.

  The hot water supply device main body 10 is, for example, disposed on the ground F outside the house via the legs 23, and the upper surface of the housing 11 is fixed to a wall surface W of a house or the like using an L-shaped fixture 13. . Here, piping 15 (shown using dotted lines in FIG. 1) for supplying hot water or the like indoors from the lower end of the hot water supply apparatus body 10 extends indoors through the wall surface W.

  FIG. 2 is an exploded perspective view of the decorative cover 20. The decorative cover 20 includes a casing (main body) 21 and a cover 22. In the figure, the casing (main body) 21 and the cover 22 are shown disassembled with respect to the reference axis L.

  The main body 21 includes two flat plate-like side surfaces 21d and three beams 21a, 21c, and 21g having attachment pieces at both ends. Here, two brackets 21e are fixed to the beam 21a. The bracket 21e has two surfaces (XZ surface and XY surface) in which two screw holes 21f and 21g are respectively formed, and is fixed to the upper end of the beam 21a with the respective surfaces facing the −Y direction and the + Z direction. ing. Note that one of the screw holes 21f and 21g is a first screw hole and the other is a second screw hole. There is no functional difference between the first screw hole and the second screw hole, and it is the same regardless of which of the screw holes 21f and 21g is the first screw hole. The bracket 21e may be formed integrally with the beam 21a by bending the + Z end of the beam 21a in the -Y direction and further in the -Z direction, or by fixing another member to the beam 21a by welding or the like. It may be formed.

  The two side surfaces 21d are arranged so that the inner surfaces are opposed to one side and the other side in the X-axis direction, and the front upper side (−Y, + Z side) ends of the front side lower side by the beam 21a. The ends on the (−Y, −Z side) are connected by a beam 21c, and the ends on the lower rear side (+ Y, −Z side) are connected by a beam 21g. The beam 21a has one surface (XZ surface) on which the bracket 21e is fixed facing forward (−Y direction), and the beams 21c and 21g have one surface facing forward (−Y direction) and rearward (+ Y direction), respectively. The mounting piece is in contact with the inner surface of the side surface 21d, and is fixed to the side surface 21d using a fixing tool such as a screw or a screw or by welding. Note that the number, shape, material, and the like of the beam and the method of attaching to the side surface 21d are appropriately determined so as to obtain sufficient strength to support the side surface 21d.

  As shown in FIG. 1, the main body 21 is disposed under the hot water supply apparatus main body 10 (on the −Z side) so that the outer surfaces of the two side surfaces 21 d are substantially flush with the side surface of the housing 11 of the hot water supply apparatus main body 10. . Thereby, the piping 15 extending from the lower end of the water heater main body 10 is disposed indoors through the two side surfaces 21d vertically (Z-axis direction) and front-back (Y-axis direction). Become.

  The cover 22 includes a front surface 22a, an upper surface 22b and a lower surface 22c, and a flange 22d. The front surface 22a is formed in a convex shape in the -Y direction. In the vicinity of the upper end (+ Z end) of the front surface 22a, two openings 22f for allowing the fixture (screw 31) to pass are provided as will be described later. The upper surface 22b and the lower surface 22c are isosceles trapezoidal flat plates, and are respectively fixed to the upper end and the lower end of the front surface 22a. As will be described later, the upper surface 22b is provided with two openings 22g through which the fixing tool (screw 31) is passed. The flange 22d is formed by bending the ± X end of the front surface 22a in the + Y direction. The lower end is formed, for example, obliquely so as not to interfere with the beam 21c when the cover 22 is fixed to the main body 21.

  By fixing the cover 22 to the main body 21 and closing the opening on the front surface of the main body 21 (side surface 21d) to form the decorative cover 20, the piping 15 extending from the lower end of the hot water supply apparatus main body 10 is hidden.

  A fixing structure 30 for fixing the cover 22 to the main body 21 will be described.

  FIG. 3 is a cross-sectional view showing the configuration of the bracket 21e and the screw 31 constituting the fixing structure 30 in a state where the cover 22 is fixed to the main body 21. For the same configuration, only one of the two brackets 21e and the screw 31 inserted in the screw holes 21f and 21g provided in the bracket 21e are shown in the figure.

  The bracket 21e has two surfaces (XZ plane and XY plane) as described above, and one end thereof is connected to form an L-shaped cross section in the YZ plane. The screw hole 21 f is provided on the XZ surface facing the front surface 22 a of the cover 22. The arrangement position is a position of a distance δ downward (−Z direction) from the connection point between the XZ plane and the XY plane. The screw hole 21g is provided on the XY surface facing the upper surface 22b of the cover 22. The arrangement position is a position at a distance γ from the connection point between the XZ plane and the XY plane. It is assumed that the screw holes 21f and 21g are disposed at the same position in the X-axis direction. The diameters and depths of the screw holes 21f and 21g are D and H, respectively.

  The openings 22f and 22g of the cover 22 are provided at positions on the front surface 22a and the upper surface 22b facing the screw holes 21f and 21g provided in the bracket 21e. That is, the arrangement position of the opening 22f is a position on the front surface 22a at a distance δ downward (−Z direction) from the connection point of the front surface 22a and the upper surface 22b. The arrangement position of the opening 22g is a position on the upper surface 22b at a distance γ in the + Y direction from the connection point between the front surface 22a and the upper surface 22b. The diameters of the openings 22f and 22g are large enough to allow the screw portion of the screw 31 to be inserted.

  The screw 31 has a head portion and a shaft portion, and two screw portions, that is, a distal end side screw portion 31a and a proximal end side screw portion 31c, and a groove portion 31b therebetween are formed on the shaft portion. Yes. The screw 31 is a drop-off prevention screw. A screw groove that can be screwed into the screw holes 21f and 21g is formed in the distal end side screw portion 31a and the proximal end side screw portion 31c. The groove portion 31b is formed such that its diameter d is smaller than the diameter D of the screw holes 21f and 21g (d <D), and its length h is longer than the depth H of the screw holes 21f and 21g (h> H).

  The head of the screw 31 has a sufficiently large diameter with respect to the screw portion, and the screw portion can be screwed into the screw hole by turning with a finger without using a tool. Moreover, the recessed part which the front-end | tip of a tool (plus driver) can engage can be formed, and it can also be screwed into a screw hole using a tool.

  When fixing the cover 22 to the casing (main body) 21 using the screws 31, first, the ± X end of the cover 22 is held with both hands on the front side of the main body 21, and the upper surface 22b of the cover 22 is set to 2 of the beam 21a. It hooks on one bracket 21e. Next, the cover 22 is shifted back and forth (Y-axis direction) and right and left (X-axis direction) to position the opening 22f of the front surface 22a on the screw hole 21f and the opening 22g of the upper surface 22b on the screw hole 21g. Finally, in this state, the screw 31 is inserted into the screw hole 21f through the opening 22f and into the screw hole 21g through the opening 22g. Here, all of the distal end side screw portion 31a and the proximal end side screw portion 31c are screwed into the screw holes 21f and 21g. Thereby, the cover 22 is fixed to the main body 21.

  The cover 22 can be easily removed from the main body 21 by removing the screws 31 (all of the distal end side screw portion 31a and the proximal end side screw portion 31c) from the screw holes 21f and 21g.

  In the screw 31 having the above-described configuration, the tip side screw portion 31a serves as a stopper for preventing the entire screw from being pulled out from the screw holes 21f and 21g. The base side screw part 31c can be pulled out from the screw holes 21f and 21g, for example, when the cover 22 is continuously vibrated.

However, since the groove portion 31b is formed between the distal end side screw portion 31a and the proximal end side screw portion 31c as described above, the proximal end side, like the screw 31 inserted in the screw hole 21g shown in FIG. When the screw part 31c is pulled out from the screw hole 21g, the groove part 31b engages with the screw hole 21g, the central axis of the screw 31 is displaced from the central axis of the screw hole 21g, and the screw 31 is locked to the edge of the screw hole 21g. Is done. Thereby, the front end side screw part 31a functions as a stopper. Then, the extraction of the entire screw from the screw hole 21g is limited to the case where the screw 31 moves accurately in the direction along the central axis of the screw hole 21g.

  As shown in FIG. 3, when the proximal-side screw portion 31c is pulled out from the screw hole 21g and the groove portion 31b engages with the screw hole 21g, the cover 22 (upper surface 22b) is mounted on the bracket 21e (XY surface) with the screw 31 as an axis. ) Can be inclined. The tiltable angle θ is determined from the relationship between the diameter d and length h of the groove 31b and the diameter D and depth H of the screw hole 21g. Strictly speaking, the angle θ is related to the diameter of the opening 22g and the thickness of the cover 22 (upper surface 22b), but for the sake of simplicity, the thickness of the cover 22 is considered to be zero here. At this time, there is a deviation from the XZ surface (screw hole 21f) of the bracket in the −Y direction (the direction along the central axis of the screw hole 21f) by a dimension E (deviation amount E in FIG. 3). This deviation amount E is determined by the relationship of γ in addition to d, h, D, and H. For example, the angle θ is small but the displacement amount E is large, and the angle θ is large but the displacement amount E is small.

  When the upper surface 22b of the cover 22 is inclined with respect to the XY surface of the bracket 21e, the front surface 22a of the cover 22 is accordingly moved from the XZ surface (screw hole 21f) of the bracket to the −Y direction (the direction along the central axis of the screw hole 21f). ). The maximum value of the separation distance L1, which is the distance to the point I that may hit the head (point G) of the screw 31 in a state perpendicular to the screw hole 21f provided in the bracket 21e, of the separation distance, Using the inclination angle θ of the cover 22 (upper surface 22b), E + H ′ + Ftanθ is obtained (F = δ + the radius of the head of the screw 31). For example, when F is small, the angle θ is small but the displacement amount E is large, the separation distance L1 is likely to be maximized. Conversely, when F is large, the angle θ is large but the displacement amount E is small. The separation distance L1 tends to be maximized. The above (E + H ′ + Ftan θ ≧ L1) is based on the premise that the angle formed by the surfaces (XY plane and XZ plane) into which two screws are screwed is 90 degrees. The maximum value of L1 may vary depending on the angle formed by the surfaces into which the two screws are screwed in, the value of γ, and other conditions, but is determined based on the actual shape and is smaller than the predetermined value. The shape can be designed.

  The cover 22 is inclined, the point I at the lower end from the opening 22f of the front surface 22a collides with the point G of the screw 31, and the head of the screw 31 is pulled in the -Y direction (perpendicular to the screw hole 21f). The center axis of 31 coincides with the center axis of the screw hole 21f, and the tip side screw portion 31a is fitted into the screw hole 21f. When the maximum value of the separation distance L1 of the front surface 22a of the cover 22 from the XZ surface of the bracket is larger than the sum (A) of the lengths of the base end side screw portion 31c and the groove portion 31b of the screw 31 inserted in the screw hole 21f. By continuously vibrating the screw 31 (or the screw hole 21f) (even if the point I does not collide with the point G, the tip side screw portion 31a is once fitted in the screw hole 21f), There is a possibility that the side screw portion 31a passes through the screw hole 21f, that is, the entire screw 31 is pulled out from the screw hole 21f.

  Even if the base end side screw portion 31c of the screw 31 put in the screw hole 21f is pulled out from the screw hole 21f, the screw 31 does not come out of the screw hole 21f as long as it is not pulled out to the tip end side screw portion 31a. The cover 22 does not fall from the main body 21. Therefore, in the decorative cover 20 of the present embodiment, the maximum value E + H ′ + Ftanθ of the separation distance L1 from the XZ plane of the bracket 22 on the front surface 22a of the cover 22 is the proximal-side screw portion 31c of the screw 31 inserted in the screw hole 21f. Further, the distance F from the connection point between the XZ plane (on the surface of the bracket 21e) and the XY plane of the screw hole 21f is determined so as to be smaller than the sum A of the lengths of the groove portions 31b. With this configuration, even if the head of the screw 31 is pulled in the −Y direction due to vibration, the cover 22 does not exceed L1 and is not separated from the XZ surface of the bracket. It is not pulled out from the hole 21f.

  Similarly, the maximum value L2 = E ′ + H + F′tan θ ′ of the Z-direction separation distance from the XY plane of the bracket on the upper surface 22b of the cover 22 is set so that L2 <A ′ (L of the bracket 21e A separation distance F ′ from the connection point between the XZ plane and the XY plane (on the surface) is determined. Thereby, it is prevented by the other screw that the two screws are all pulled out from the screw hole. Here, L2, E ′, A ′, and θ ′ are not shown in FIG. 3, but the separation distance L1, the shift amount E, the length of the screw portion and the groove portion shown for the lower screw 31 in FIG. 3, respectively. Are the values obtained for the upper screw 31.

  In the present embodiment, the screw holes 21f and 21g in the bracket 21e are disposed at the same position in the X-axis direction. However, even when they are different, the distance between the two screw holes 21f and 21g can be determined similarly. That's fine. However, the separation distance is defined within a plane in which the cover 22 can tilt with respect to the bracket 21e (in a plane orthogonal to the reference axis of tilt).

  As described above in detail, using the fixing structure 30 according to the present invention, that is, between the distal end side screw portion 31a and the proximal end side screw portion 31c, the groove portion is smaller in diameter than the screw hole and longer than the depth thereof. The cover 22 is fixed to the main body 21 using a screw 31 having a shaft portion on which 31b is formed. Even if the cover 22 is inclined with respect to the bracket 21e (main body 21) about the screw 31 inserted in the screw hole 21g, the vicinity of the opening 22f of the front surface 22a of the cover 22 is parallel to the central axis from the screw hole 21f. Since the distance A or more is not separated in the (−Y direction), the tip side screw portion 31a of the screw 31 put in the screw hole 21f enters the screw hole 21f and is not pulled out. Therefore, the cover 22 is always hooked on the screw 31 and can be used safely without dropping from the casing (main body).

  In the hot water supply apparatus in which the main body of the hot water supply apparatus is placed close to the box, there may be a case where there is not enough distance between the hot water supply apparatus main body 10 and the box to place the head of the screw 31. Even in such a case, the fixing structure 30 according to the present invention can be used. As shown in FIG. 4 (A), the hot water supply device main body is not a strict rectangle in front view, but has a shape in which an end portion is cut out. An enlarged view of the end is given in FIG. There is a gap in the notched portion, and the head of the screw 31 can be arranged there. In this arrangement, screw holes can be provided in the XY plane and the YZ plane. Although F ′ is a distance in the X direction with respect to FIG. 3, it can be set to a small F ′ so that E ′ + H + F′tan θ ′ <A ′.

  In the decorative cover 20 of the hot water supply device 1 of the present embodiment, screw holes 21f and 21g are provided on each of two surfaces (XZ surface and XY surface) of the bracket 21e, and two of the front surface 22a and the upper surface 22b of the cover 22 are provided. The surface was fixed to the bracket 21e using screws 31. Instead, the bracket 21e is composed of three surfaces (XZ surface, XY surface, and YZ surface), each of which is provided with a screw hole, and the three surfaces of the cover 22 are fixed to the bracket 21e using screws 31. It is good.

  Moreover, in the decorative cover 20 of the hot water supply device 1 of the present embodiment, the two brackets 21e constituting the fixing structure 30 are adopted, but the number of the brackets 21e is appropriately determined according to the required mounting strength.

Further, the decorative cover 20 of the hot water supply apparatus 1 of the present embodiment is configured such that the entire front surface of the main body 21 is opened and the front surface is covered with the cover 22 having the same shape. A configuration may be adopted in which a front surface is provided on 21 and an opening provided in a part thereof is covered with a cover having the same shape as or larger than the opening. Further, a configuration may be adopted in which the side surface, the rear surface, or the lower surface is opened instead of the front surface, and that one surface is covered with the cover 22.
Further, the same screw 31 may not be used for fixing the two surfaces.

  In addition, the fixing structure 30 of the present embodiment is not only usable in the decorative cover 20 of the hot water supply device 1 but can be used for anything that fixes an object to be fixed to an object to be fixed.

  The fixing structure of the present invention is suitable for fixing an object to be fixed to an object to be fixed. Moreover, the hot water supply device of the present invention can be easily removed without dropping the decorative cover that hides the pipe extending from the hot water supply device body, and is suitable for safe use.

DESCRIPTION OF SYMBOLS 1 ... Hot-water supply apparatus 10 ... Hot-water supply apparatus main body 11 ... Housing 13 ... Fixture 15 ... Pipings 20 ... Cosmetic cover 21 ... Casing (main body)
21a, 21c, 21g ... Beam 21d ... Side 21e ... Bracket 21f, 21g ... Screw hole 22 (22a, 22b, 22c, 22d) ... Cover (front, top, bottom, side / flange)
22f, 22g ... opening 23 ... leg 30 ... fixing structure 31 (31a, 31b, 31c) ... screw (front end side screw part, groove part, base end side screw part)

Claims (6)

A fixing structure for fixing an object to be fixed to a fixing object using a screw,
The fixed object has a first surface provided with a first opening and a second surface provided with a second opening,
The first surface and the second surface intersect each other;
The fixing object is provided with a first screw hole facing the first opening and a second screw hole facing the second opening,
The fixing structure, wherein the screw is screwed into the first screw hole through the first opening, and the screw is screwed into the second screw hole through the second opening.   The screw is a drop-off prevention screw having a shaft portion in which a groove portion having a diameter smaller than a screw hole and longer than a depth thereof is formed between a distal end side screw portion and a proximal end side screw portion. The fixing structure according to claim 1. When the groove portion of the screw is engaged with the first screw hole or the second screw hole, the first screw or the second screw is a central axis of the first screw hole or the second screw hole. When the maximum angle that can be tilted with respect to the central axis is θ,
A deviation length L1 of the second opening from the second screw hole when the first surface is inclined by θ on the surface of the fixing target of the first screw hole, and the second screw hole The length L2 of the first opening from the first screw hole when the second surface is inclined by θ on the surface of the fixed object is the tip end side of the screw. The fixing structure according to claim 2, wherein the fixing structure is shorter than a sum (A, A ′) of a length of the screw portion and the groove portion (L1 <A, L2 <A ′). A plurality of the first openings and the second openings are provided on the first surface and the second surface, respectively.
The fixing according to claim 1, wherein the fixing object is provided with a plurality of first screw holes and a second screw hole corresponding to the plurality of first openings and second openings. Construction. A water heater main body,
A box that covers the pipe that is to be fixed and extends from the hot water supply device main body,
A cover that is the object to be fixed, and covers an opening provided in at least a part of the box;
And the cover is fixed to the box by the fixing structure according to any one of claims 1 to 4. The box is disposed under the hot water supply device body,
There is a place having a gap between the upper surface of the box at the end of the lower surface of the water heater main body,
The hot water supply apparatus according to claim 5, wherein the box body to be fixed has the first opening or the second opening at a location facing the gap.