JP2001124024A - Fixing strucrure of case member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a case member fixing structure including an engaging piece unlikely to slip off from an engaging projection and capable of being embodied at low cost through simplification of a die structure. SOLUTION: A facing plate 3 made of synthetic resin is installed at the front face opening of a lower case 1, and the front of surface of the facing plate 3 is covered with a colorless, transparent see-through plate 4. An engaging projection 7 approximately in a wedge from having a first engagement surface 6 is formed on the vertical wall 5 of the see-through plate 4. With possibility of elastic deformation, a frame-shaped engaging piece 9 is protrusively installed on that flat portion 8 of the facing plate 3 mating with the projection 7, and a through hole 14 is provided in that place on the flat portion 8 opposing to the second engaging surface 12 corresponding to the undersurface of the upper frame 11 and the place on the engaging piece 9 located opposite the see-through plate 4 (back position on the piece 9). The lower case 1 is furnished upright with a first wall 15 on the bark of the piece 9 in such a way as penetrating the through hole 14, and a second wall 16 is installed along the rear surface of the plate 3 in such a way as blocking the through hole 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case in which a case member provided with an engagement protrusion and a case member provided with an elastically deformable locking piece are locked to fix both case members. The present invention relates to a member fixing structure.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a schematic configuration diagram of a case member having a lower case, a return plate, and a see-through plate. FIG. 6 is a partial perspective view showing a fixing structure of the case member, and FIG. FIG. In both figures, 1 is a lower case with an open front surface, and 2 is a peripheral wall thereof. Reference numeral 3 denotes a synthetic resin facing plate disposed on the front opening side of the lower case 1, and reference numeral 4 denotes a transparent plate made of a colorless and transparent resin that covers the front side of the facing plate 3. A first locking surface 6 is provided on the vertical wall 5 of the transparent plate 4.
And a substantially wedge-shaped engaging projection 7 having Further, a frame-shaped locking piece 9 is provided on the flat portion 8 of the dial plate 3 corresponding to the engagement projection 7.
Are elastically deformable.

[0003] Such a case member is placed and fixed on the front opening side of the lower case 1 and then the return plate 3
Is covered with the see-through plate 4 at this time. At this time, the tip of the upper frame 11 of the locking piece 9 comes into contact with the inclined surface 10 of the engaging projection 7 and
Is inserted while bending outward. When the upper frame 11 of the locking piece 9 is disengaged from the engaging projection 7, the locking piece 9 returns to its original state, and the second locking surface 12 of the locking piece 9 becomes the first engagement surface of the engaging projection 7. The see-through plate 4 is fixed to the return plate 3 by being locked to the stop surface 6. Although not shown, the return plate 3 and the lower case 1 are fixed by an appropriate method.

[0004]

However, in the case of the prior art, when an external force is applied to the locking piece 9 in the direction of releasing the locking with the engaging projection 7, the locking piece 9 can be elastically deformed. Because of the shape, it was easy to come off from the engagement projection 7 in some cases. The locking piece 9 is formed in a frame shape having a hole 13 in order to obtain the second locking surface 12. That is, it is undercut. Therefore, when the return plate 3 is formed by injection molding, the hole 13 must use a slide mold, and the mold structure is complicated and the cost is high.

The present invention has been made in view of the above points, and provides a case member fixing structure in which a locking piece is hard to be disengaged from an engaging projection, and a mold structure is simplified to reduce costs. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a lower case having an open front surface, a first case member disposed on the front opening side of the lower case, and a first case member. A second case member that covers a front side of the member, wherein the second case member is provided with an engagement projection having a first locking surface, and the first case member is provided with the first engagement member. An elastically deformable locking piece having a second locking surface for locking to the locking surface is projected, and a through-hole is provided at a position facing the second locking surface and around the lower locking case; A first wall portion is erected behind the locking piece.

In addition, a peripheral wall of the lower case is provided outside the through hole, and a second wall for closing the through hole is provided in the lower case.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on each embodiment, and the same or corresponding parts as those in the conventional example will be denoted by the same reference numerals. The first case member will be described as a return plate, and the second case member will be described as a see-through plate.

FIG. 1 is a partial perspective view showing a first embodiment of the present invention, and FIG. 2 is a sectional view thereof. In both figures, reference numeral 1 denotes a lower case having an open front surface, and 2 denotes a peripheral wall constituting the lower case 1, which is provided outside a through hole 14 provided in a return plate 3 described later. For example, a display is housed in the lower case 1. Reference numeral 3 denotes a synthetic resin facing plate disposed on the front opening side of the lower case 1 and covers the periphery of the lower case 1 on the front side. Reference numeral 4 denotes a see-through plate made of a colorless and transparent resin that covers the front side of the dial plate 3. A substantially wedge-shaped engaging projection 7 having a first locking surface 6 is provided on the vertical wall portion 5 of the see-through plate 4.

A frame-shaped locking piece 9 is elastically deformable and protrudes from the flat portion 8 of the return plate 3 corresponding to the engagement projection 7 in the same manner as in the conventional example. 2
And the flat portion 8 opposite to the see-through plate 4 of the locking piece 9 (the portion behind the locking piece 9), that is, the second locking surface 12 of the facing plate 3. A through hole 14 is provided at the opposing location and at the periphery thereof. Further, the lower case 1 passes through the through hole 14 of the return plate 3 and the first
The two wall portions 15 are provided upright, and the second wall portion 16 is provided along the back surface of the return plate 3 so as to cover the through holes 14.

In such a case member, first, the see-through plate 4 is fixed to the return plate 3. The tip of the upper frame 11 of the locking piece 9 provided on the return plate 3 abuts against the inclined surface 10 of the engagement projection 7 provided on the see-through plate 4, and the locking piece 9 is inserted while flexing outward. When the upper frame 11 of the locking piece 9 is disengaged from the engaging projection 7, the locking piece 9 returns to its original state, and the second locking surface 12 of the locking piece 9 becomes the first engagement surface of the engaging projection 7. The see-through plate 4 is fixed to the return plate 3 by being locked to the stop surface 6. Next, the return plate 3 to which the see-through plate 4 is fixed is fixed to the lower case 1 by an appropriate method. Then, as described above, the first wall portion 15 erected on the lower case 1 is located behind the locking piece 9, and the second wall portion 16 provided on the lower case 1 penetrates the dial plate 3. The hole 14 will be closed.

According to the first embodiment of the present invention constructed as described above, an external force is applied to the locking piece 9 in the direction of releasing the locking with the engaging projection 7 so that the locking piece 9 bends outward. Also, the first wall portion 15 erected on the lower case 1 suppresses the bending, and prevents the locking piece 9 from coming off the engagement projection 7. In addition, since the through-hole 14 is provided at least in the portion of the locking piece 9 facing the second locking surface 12, there is a hole 13 in the center of the locking piece 9, and this portion is undercut. Also, when the return plate 3 is formed by injection molding, the hole 13 does not need to use a slide mold, and the mold structure can be simplified. Furthermore, since the through hole 14 provided in the return plate 3 can be closed by the second wall portion 16 provided in the lower case 1, even if the through hole 14 is located inside the peripheral wall 2 of the lower case 1, Intrusion of dust into the lower case 1 can be suppressed, and even if the see-through plate 4 is colorless and transparent as in the present embodiment, it does not affect the visibility of a display or the like.

FIG. 3 and FIG. 4 show a second embodiment of the present invention. The see-through plate 4 is provided with a convex engaging projection 7 having a first locking surface 6. In addition, a locking piece 9 having a locking claw 17 on the distal end side is provided on the flat portion 8 of the dial plate 3 corresponding to the engagement protrusion 7. The upper surface of the locking claw 17 is the inclined surface 10, and the lower surface is the second locking surface 12. Then, eight flat portions facing the second locking surface 12 and portions behind the locking pieces 9, that is, the second portions of the facing plate 3.
And its surroundings (the locking pieces 9
(A side opposite to the see-through plate 4). The lower case 1 has a through hole 14 provided behind the locking piece 9.
And the first wall 15 is erected behind the locking piece 9, and the second wall 16 is closed so as to cover both the through holes 14.
Are provided along the back surface of the return plate 3.

In such a case member, first, the see-through plate 4 is fixed to the return plate 3 as in the first embodiment. The lower end of the engaging projection 7 provided on the see-through plate 4 abuts on the inclined surface 10 of the locking claw 17 of the locking piece 9 provided on the return plate 3, and the locking piece 9 is inserted while flexing outward. When the engagement projection 7 is disengaged from the engagement claw 17, the engagement piece 9 returns to its original position, and the second engagement surface 12 of the engagement piece 9 is brought into contact with the first engagement surface 6 of the engagement protrusion 7. The see-through plate 4 is locked and fixed to the return plate 3. Next, the return plate 3 to which the see-through plate 4 is fixed is fixed to the lower case 1 by an appropriate method. Then, as described above, the first wall portion 15 erected on the lower case 1 is located behind the locking piece 9, and
The second wall 16 provided in the lower case 1 closes the through-hole 14 of the return plate 3.

According to the second embodiment of the present invention constructed as described above, an external force is applied to the locking piece 9 in the direction of releasing the locking with the engaging projection 7, and the locking piece 9 bends outward. Also, the first wall portion 15 erected on the lower case 1 suppresses the bending, and prevents the locking piece 9 from coming off the engagement projection 7. In addition, since the through-holes 14 are provided in at least the portions of the locking pieces 9 facing the second locking surfaces 12, the second locking surfaces 1
Even if there is an undercut between the portion 2 and the eight flat portions, when forming the return plate 3 by injection molding, it is not necessary to use a slide die in this portion, and the die structure can be simplified. Furthermore, since both through holes 14 provided in the return plate 3 can be closed by the second wall 16 provided in the lower case 1, even if the through holes 14 are located inside the peripheral wall 2 of the lower case 1. In addition, it is possible to prevent dust from entering the lower case 1.

In each of the above embodiments, the case where the return plate is fixed at the periphery of the see-through plate has been described.
A similar structure may be adopted, for example, near the center of the see-through plate without being limited to the peripheral edge.

[0017]

According to the first aspect of the present invention, even when an external force is applied to the locking piece in a direction to release the locking with the engagement projection, the locking piece attempts to bend outward, and the locking piece stands on the lower case. The first
The deflection of the locking piece can be prevented by the wall portion of the locking member from coming off the engagement projection. In addition, since a through hole is provided at least at a portion of the locking piece that faces the second locking surface, a slide mold does not need to be used when forming the return plate by injection molding, and the mold structure can be simplified, A case member fixing structure that is inexpensive can be obtained.

According to the second aspect of the present invention, even if there is a through hole penetrating the inside and outside of the lower case inside the peripheral wall of the lower case, it can be closed by the second wall provided in the lower case. Therefore, intrusion of dust into the lower case can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a fixing structure of a case member according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a fixing structure of the case member according to the first embodiment.

FIG. 3 is a partial perspective view showing a fixing structure of a case member according to the second embodiment.

FIG. 4 is a partial cross-sectional view illustrating a case member fixing structure according to the second embodiment.

FIG. 5 is a schematic configuration diagram showing the entire case member.

FIG. 6 is a partial perspective view showing a conventional case member fixing structure.

FIG. 7 is a partial cross-sectional view showing a conventional case member fixing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower case 2 Peripheral wall 3 Look-up board (1st case member) 4 See-through board (2nd case member) 6 First locking surface 7 Engagement protrusion 9 Locking piece 12 Second locking surface 14 Through hole 15 1st wall part 16 2nd wall part

Claims (2)

[Claims] 1. A lower case having an open front surface, a first case member disposed on the front opening side of the lower case, and a second case member covering the front side of the first case member. The second case member has an engagement projection having a first engagement surface, and the first case member has a second engagement surface engaged with the first engagement surface. An elastically deformable locking piece protrudes, and a through hole is provided at a position facing the second locking surface and in the vicinity thereof, and a first wall portion is provided in the lower case behind the locking piece. A case member fixing structure characterized by standing up. 2. The case member according to claim 1, wherein a peripheral wall of the lower case is provided outside the through hole, and a second wall portion closing the through hole is provided in the lower case. Fixed structure.