JP3008160B2 - Case structure of wall-mounted instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case structure of a wall-mounted appliance such as a water heater.

[0002]

2. Description of the Related Art Conventionally, a case of a wall-mounted water heater has a back plate fixed to a member to be mounted on the wall via a fixing bracket,
And a front cover that covers the interior components (heat exchanger, burner, etc.) of the water heater. In such a case, the back plate is press-formed into a dish shape, an outer bent flange is formed on a side edge thereof, an inner bent flange is formed on an edge of a side plate portion of the front cover, and an inner bent flange is formed on the outer bent flange. Is also known in which a front cover is attached to a back plate in a state where the front cover is joined from the front.

[0003]

The inner bending flange of the front cover is formed by bending, and the bending angle of the inner bending flange tends to be out of order due to the influence of springback or the like. Then, when the inner bending flange is joined to the outer bending flange of the back plate, the two flanges do not make surface contact, and the free end of the inner bending flange hits the inner edge portion of the outer bending flange, and the base end of the inner bending flange. The part floats from the outer edge portion of the outer bending flange, and a gap visible from the side between the back plate and the front cover is evident, which may impair the appearance.

[0004] Conventionally, both the rear plate and the front cover are formed of a steel plate and each is coated. However, even if it is unavoidable to apply the coating to the front cover, it is necessary to reduce the cost. It is desired that the face plate be formed of a color steel plate and the coating be omitted. However, even if the back plate is formed of a color steel plate, the outer edge of the outer bent flange of the back plate is cut by trimming to expose the metal, and the outer edge of the outer bent flange is the inner bent flange of the front cover. Since the water heater is not covered, when the water heater is viewed from the side, an uncolored cut at the outer edge of the outer bent flange appears in the appearance and impairs the appearance, so that the cut must be painted.

SUMMARY OF THE INVENTION In view of the above, the present invention has been made so that the inner bent flange of the front cover can be joined to the outer bent flange of the back plate without forming a gap, and the back plate is formed of a color steel plate. It is an object of the present invention to make it possible to significantly reduce costs by eliminating the need for painting of the cut end.

[0006]

Means for Solving the Problems In order to solve the above section,
The present invention relates to a case of a wall-mounted device comprising a back plate and a front cover, wherein the back plate is press-formed into a dish shape, and at the side edge of the back plate, at the edge of the side plate portion of the front cover. An outer bending flange for joining the formed inner bending flange from the front, wherein a hemming portion is formed at an outer edge portion of the outer bending flange by folding a free end to a front side of the outer bending flange. .

According to this configuration, the outer edge portion of the outer bending flange rises forward by the hemming portion, and the base end portion of the inner bending flange contacts the front surface of the hemming portion. Therefore,
Even if the bending angle of the inner bending flange is misaligned, the free end of the inner bending flange does not hit the inner edge portion of the outer bending flange, so that a gap visible from the side between the two flanges does not appear. In addition, since the cut end at the free end of the outer bending flange is folded inward of the flange, the cut end does not appear in the appearance, and if the back plate is formed of a color steel plate, no painting is required.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, reference numeral 1 denotes a case of a wall-mounted water heater. The case 1 includes a gas burner 2 and a heat exchanger 3 using the burner 2 as a heat source. And a water-based valve unit 5 connected to the lower water pipe joint 4 and a gas valve unit 7 connected to the lower gas pipe joint 6.

A heat exchange water passage 8 passing through the heat exchanger 3 and a bypass water passage 9 are connected to the downstream side of the water system valve unit 5, and a downstream end of the heat exchange water passage 8 and a downstream end of the bypass water passage 9 are connected to each other. The merging was performed at a mixing section 10 provided at the center of the lower end of the case 1, and a tapping head 11 was connected to the mixing section 10 via a flexible tube 12.

The case 1 includes a pair of upper and lower fixing brackets 13 and 1.
Back plate 15 fixed to a member to be mounted on the wall side via the base plate 4
And a front cover 16 that covers the water heater from the front to the side.
It is composed of The fixing brackets 13 and 14 are fixed to the back plate 15 by screws 13a and 14a.

The back plate 15 is made of a color steel plate as shown in FIGS.
It is formed by pressing into a dish as shown in
Outer bending flange 15a bent outward on left and right side edges of 5
And three upper and lower claw pieces 15b, 15c, 15d extending forward are formed on each outer bending flange 15a. The upper claw piece 15b is obliquely upward.

As shown in FIG. 5, an inwardly bending flange 16a which is bent inward is formed at the edge of each of the left and right side plates of the front cover 16, and the upper and lower slits are formed in the flange 16a. (Not shown), and the upper claw piece 15b is formed in the upper slit in a state where the front cover 16 is inclined backward.
Then, the front cover 1 is set with the claw piece 15b as a fulcrum.
6 is tilted to the vertical position, and the middle and lower claw pieces 15c and 15d are engaged with the middle and lower slits, thereby positioning the front cover 16 up, down, left and right, and engaging with the back plate 15. I got it. In this engaged state,
The inner bending flange 16a is joined to the outer bending flange 15a on each of the left and right sides of the back plate 15 from the front. The front cover 1
6 is made of sheet metal and painted.

A hemming portion 15e is formed at the outer edge of each outer bending flange 15a of the back plate 15 by folding a free end toward the front side of the outer bending flange 15a. Therefore, the inner bending flange 16a of the front cover 16 has a hemming portion 15e of the outer bending flange 15a at its base end.
Abut. Therefore, even if the bending angle of the inner bending flange 16a is deviated due to springback or the like, the free end of the inner bending flange 16a hits the inner edge portion of the outer bending flange 15a, and the base end of the inner bending flange 16a is moved. There is no floating from the outer edge portion of the outer bending flange 15a, and a gap visible from the side between the back plate 15 and the front cover 16 is not clear.

Also, the cutout 15e at the free end of the outer bending flange 15a is folded back inside the flange 15a, so that the cutout 15e does not appear in the external appearance. Painting is not required.

When the back plate 15 is press-formed into a dish shape, it is necessary to secure a relatively wide press allowance at the peripheral portion of the blank used as the material of the back plate 15. An excess portion of the presser allowance is trimmed, and an outer bent flange is formed by the remaining portion of the presser allowance. On the other hand, according to the present embodiment, the surplus portion of the presser allowance can be effectively used as a bending allowance for hemming, and the hemming portion 15e
The material cost does not increase even if it is formed.

Further, in the present embodiment, outer bending flanges 15f are also formed on both upper and lower edges of the back plate 15, and
A hemming portion 15g similar to the above is formed at the outer edge portion of 5f, in order to prevent the operator from injuring the fingertip by the cuts at the upper and lower edges of the back plate 15 during the assembling stage. Not essential.

Although the embodiment in which the present invention is applied to the case of the wall-mounted water heater has been described, the present invention can be similarly applied to other wall-mounted appliances other than the water heater.

[0018]

As is apparent from the above description, according to the present invention, there is no visible gap between the back plate and the front cover, which can be seen from the side, and the appearance is improved. ,
If the cut edge of the free end of the outer bending flange of the back plate does not appear in the appearance, and if the back plate is formed of a color steel plate, no painting is required and the cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a water heater having a case according to the present invention, with a front cover removed.

FIG. 2 is a right side view of FIG.

FIG. 3 is a front view of a back plate of the water heater of FIG. 1;

FIG. 4 is a left side view of FIG. 3;

5 is an enlarged sectional view taken along line VV of FIG.

[Explanation of symbols]

15 Back plate 15a Outer bending flange 15e Hemming part 16 Front cover 16a Inner bending flange

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-179324 (JP, A) JP-A-4-43765 (JP, U) JP-A-63-104948 (JP, U) 39403 (JP, Y2) Jiko 61-8740 (JP, Y2) Jiko 35-6667 (JP, Y1)

Claims (2)

(57) [Claims] 1. A case of a wall-mounted device comprising a back plate and a front cover, wherein the back plate is press-formed into a dish shape, and an edge of a side plate portion of the front cover is provided on a side edge of the back plate. Forming an outer bending flange which joins the inner bending flange formed from the front to the front, wherein a hemming portion formed by folding a free end to the front side of the outer bending flange is formed at an outer edge portion of the outer bending flange. Case structure of a wall-mounted appliance. 2. The case structure of a wall-mounted device according to claim 1, wherein the back plate is formed of a color steel plate.