JPH07231535A - Locking structure for case - Google Patents

Abstract

PURPOSE:To prevent unlocking even in the lateral direction by forming recesses and protrusions for second locking in the inner face of the peripheral wall of an outside case and on the outer face of the peripheral wall of an inner case. CONSTITUTION:When an upper case 12 is applied to a lower case 11 and the recess and protrusion 11b, 12b for first lock are engaged vertically each other, both cases 11, 12 are locked vertically so that they are not removed in the direction B(upper direction) opposite to the applying direction while at the same time recess and protrusion 11d, 12d for second lock are also engaged each other. The peripheral walls 11a, 12a of lower and upper cases 11, 12 are prevented from being bent outward and inward, respectively, in the lateral direction A through engagement of the recess and protrusion 11d, 12d for second lock in the lateral direction. In other words, the recess and protrusion 11b, 12b for first lock are locked not to be removed in the lateral direction A and thereby both cases 11, 12 are locked not to be removed in the direction A (lateral direction) and direction B (vertical direction).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case lock structure, and more particularly, to a pair of case locks whose peripheral walls are overlapped with each other so that they cannot be disengaged in the opposite direction or the lateral direction. It is a thing.

[0002]

2. Description of the Related Art An electrical connection box used for branching and connecting a wire harness for an automobile to various electric components, for example,
As shown in FIG. 5, the joint box J / B is assembled by covering the lower case 1 with the upper case 2. In the joint box J / B, lower case 1
The protrusion 1d is provided on the inner surface of the upper end of the peripheral wall 1a of the
The lower part of d is formed as a locking recess 1b, while a locking projection 2b is provided on the outer surface of the peripheral wall 2a of the upper case 2, and the locking projection 2b is vertically aligned with the locking recess 1b on the lower case 1 side. The two cases 1 and 2 are locked so as not to come off in the opposite direction B. That is,
In the figure, the upper case 2 is prevented from coming off in the upward direction in the vertical direction.

However, as shown by the alternate long and two short dashes line in FIG. 5, when the peripheral wall 1a of the lower case 1 is bent in the lateral direction A orthogonal to the vertical engaging direction, the locking recess 1b is used for locking the upper case 2. There is a possibility that the upper case 2 may come off from the convex portion 2b and come off in the anti-covering direction B. For this reason, a plurality of welding jigs 2c are provided in advance in the upper case 2, the welding shaft 2c is passed through the hole 1c provided in the lower case 1, and the tip thereof is welded from the outside. The upper case 2 may be fixed to the.

[0004]

However, if the upper case 2 is fixed to the lower case 1 by welding, there is a problem that the welding work increases and the cost increases, and the upper case 2 cannot be removed during maintenance.

The present invention has been made in order to solve the above problems, and in the case where the upper case and the lower case are locked vertically, the lock is not easily disengaged even in the lateral direction orthogonal to the top and bottom, and the cost is low. It is intended to provide a case locking structure.

[0006]

In order to achieve the above object, the present invention according to claim 1 covers the peripheral wall of the lower case and the peripheral wall of the upper case so as to overlap each other,
In a case in which a first locking concave-convex portion that locks in the vertical direction is formed on the inner surface of the outer peripheral wall of the case and the outer surface of the inner peripheral wall of the case, the inner surface of the outer peripheral wall of the outer case On the outer surface of the peripheral wall of the case,
A lock structure for a case, characterized in that a second locking concave-convex portion is formed so as to prevent the first locking concave-convex portion from being disengaged in a lateral direction that is orthogonal to the vertical direction.

Further, in the second aspect of the present invention, the second locking concave-convex portion is formed on both sides of the first locking concave-convex portion that engage with the upper and lower sides of the first locking concave-convex portion. It provides a lock structure. Also, in claim 3, the second
The above-mentioned recesses for locking are formed as semi-circular, quarter-circular, and saw-tooth-shaped recesses while the second locking projections are formed as semi-circular, quarter-circular, and saw-tooth-shaped projections. There is provided a case locking structure according to any one of items.
The most preferable shape of the second locking concavo-convex portion is such that the inner locking portion in the left-right direction is brought into contact with the vertical locking surface.

[0008]

According to the first aspect of the present invention, when the peripheral wall of the lower case and the peripheral wall of the upper case are covered so as to overlap each other, both cases are locked in the vertical direction (opposite direction) by the first locking concave and convex portion. At the same time, the first locking concave-convex portion is locked by the second locking concave-convex portion so as not to come off in the lateral direction. As a result, both cases are locked in two stages so as not to come off in two different directions.

As with the first locking concave / convex portion, the second locking concave / convex portion can be molded at the same time when molding each case, so that the cost is low. Further, the second locking concave-convex portion is the first
Similar to the lock concavo-convex portion, it can be removed by applying force, so it is possible to remove both locks and remove the case during maintenance.

According to the second aspect of the present invention, the first lock portion and the second lock portion can be integrated in one place in both the upper case and the lower case, and the lock portion can be molded. Easy and first
The lock and the second lock can be performed with one touch by one lock operation. Further, if the shape of the second locking concavo-convex portion is formed in a semicircular shape, a quarter-circular shape, or a sawtooth shape as described in claim 3, and if the outer side of the locking side is a curved surface or an inclined surface, Can be done easily. In addition, if the opposite inner side is formed as a vertical straight surface, it can be easily prevented from coming off after being locked.

[0011]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. As shown in FIG. 1 (A), the joint box J / B for automobiles of the first embodiment is made of a synthetic resin in the shape of a rectangular box from the inside of the peripheral wall 11a of the synthetic resin lower case 11 in the shape of a rectangular box. The peripheral wall 12a of the upper case 12 is covered so as to overlap each other.

From the inner surface of the upper end of the peripheral wall 11a of the lower case 11, a protrusion 11x is provided so as to protrude toward the opening side, and the protrusion 11 is formed.
While forming the first locking recess 11b in the lower part of x,
On the outer surface of the peripheral wall 12a of the upper case 12, a first locking protrusion 12b is formed by an outwardly protruding portion. The engagement lower surface 11c of the first locking concave portion 11b and the engagement upper surface 12c of the second locking convex portion 12b are formed into a flat surface.

Therefore, when the lower case 11 is covered with the upper case 12, the first locking concave-convex portions 11b, 1 are formed.
When the two walls 11c and 12c are engaged with each other by facing each other while the peripheral walls 11a and 12a are flexed, the two cases 11 and 12 are locked so as not to come off in the anti-overturning direction B. It

The engaging upper surface 12c of the first locking projection 12b of the upper case 12 is integrally formed with a second locking projection 12d having an upward semicircular cross section, and the first lock of the lower case 11 is formed. Lower surface 11 of the concave portion 11b for engagement
A second locking recess 11d having a downward semi-circular cross section is integrally formed with c so that the second locking projection 12d is engaged.

With the above structure, the lower case 11 is covered with the upper case 12, and the first locking concave-convex portions 11 are formed.
By engaging b and 12b in the vertical direction, both cases 11 and
12 is locked up and down so as not to be disengaged in the anti-covering direction (upward direction) B. At the same time, the second locking concave-convex portions 11d and 12d are also engaged.

Due to the engagement of the second locking concave-convex portions 11d and 12d, the peripheral wall 11a of the lower case 11 bends outward in the lateral direction A, and the peripheral wall 12A of the upper case 12 flexes inward in the lateral direction A. Even if it tries, the second locking concave-convex portions 11d and 12d cannot be bent by the lateral engagement. That is, the second locking concave-convex portions 11d, 1
In 2d, the first locking concavo-convex portions 11b and 12b are locked so as not to come off in the lateral direction A.
1 and 12 are locked so as not to come off in two different directions A (horizontal direction) and B (vertical direction).

When the upper case 12 is detached from the lower case 11 for maintenance, the peripheral wall 11a of the lower case 11 is forced to exert an outward lateral direction A.
When bent, the second lock is released due to the engagement of the second locking concavo-convex portions 11d and 12d. Therefore, the lower case 11 may be lifted in the anti-covering direction B in the same manner as in the conventional case.

Further, the second locking concave-convex portions 11d, 1
2d is similar to the first locking concave-convex portions 11b and 12b,
Since the cases 11 and 12 can be simultaneously molded at the time of molding, the cost is low.

In FIG. 1A, the second case is provided on the lower case 11 side.
Although the locking recess 11d and the second locking projection 12d are formed on the upper case 12 side, respectively, as shown in FIG. 1B, the second locking projection 11d is formed on the lower case 11 side.
e on the upper case 12 side for the second locking recess 12e
May be formed respectively.

In the first embodiment described above, the second locking recess 11d of the lower case 11 and the second locking projection 12d of the upper case 12 are formed in a semicircular cross section.
As in the second embodiment shown in (A), the upper case 12
The second locking convex portion 12f is formed in a circular shape having an upward cross section of ¼, that is, a quadrant shape, and the second case of the lower case 11 is formed.
The locking recess 11f may be formed in a semicircular shape with a downward cross section so that the second locking projection 12f engages. As shown in FIG. 2B, the lower case 11
The second locking protrusion 11g may be formed on the side and the second locking recess 12g may be formed on the upper case 12 side.

Also, as in the third embodiment shown in FIG. 3, the second locking projection 12h of the upper case 12 is formed in a sawtooth shape with an upward cross section, and the second locking recess 11h of the lower case 11 is formed. The cross section may be formed in a downward sawtooth shape so that the second locking recess 12h is engaged. In addition, as shown in FIG. 3B, the second case is provided on the lower case 11 side.
You may form the locking convex part 11i and the 2nd locking concave part 12i in the upper case 12 side.

In each of the above-described embodiments, the inner peripheral wall 1a of the lower case 11 is provided inwardly from the inner peripheral wall 11a of the lower case 11 from above.
Although the structure is such that the peripheral wall 2a is covered, as shown in FIG. 4, the peripheral wall 11a of the lower case 11 may be covered with the peripheral wall 12a of the upper case 12 from above. In this case, for example, the peripheral wall 1 of the upper case 12 is
The first locking projection 12k is formed on the inner surface of the lower case 2a, and the first locking recess 11k is formed on the outer surface of the peripheral wall 11a of the lower case 11.
To form. Further, a flange portion 11j for contacting the lower surface of the peripheral wall 12a of the upper case 12 is provided on the outer surface of the peripheral wall 11a of the lower case 11, and a second locking convex portion 11l is formed on the upper surface of the flange portion 11j. The second locking recess 12l may be formed on the lower surface of the peripheral wall 12a of the groove 12.

[0023]

As is apparent from the above description, in the lock structure for a case according to the present invention as defined in claim 1, the peripheral wall of the lower case and the peripheral wall of the upper case are covered so as to overlap each other, and the first lock is provided. Lock both cases in the opposite direction with the projection-depression section, and at the same time, lock the first locking projection-depression section in the second locking projection-depression section so that it does not come off in the lateral direction. It is a two-stage lock.

Therefore, the second locking concavo-convex portion is the first
Similar to the lock concavo-convex portion, the cost can be reduced because the molding can be performed simultaneously when molding each case, and the cost does not increase unlike the conventional welding shaft. Further, the second locking concave-convex portion is
As with the first locking concavo-convex portion, it can be removed by applying force, so it is possible to remove both locks and remove the case at the time of maintenance, and the disadvantage that the upper case cannot be removed like the conventional welding shaft. Disappear.

Further, according to the structure of claim 2, in both the upper case and the lower case,
The first lock portion and the second lock portion can be molded together in one place, and the shape of the molding die can be simplified. Further, despite the two-stage lock structure, the first lock and the second lock can be performed with one touch by a single lock operation. Further, the shape of the second locking concave-convex portion is as defined in claim 3.
As described in, it is formed in a semicircular shape, a quarter semicircular shape, and a sawtooth shape,
If the outside of the locking side is curved or inclined, locking can be done easily. In addition, if the opposite inner side is formed as a vertical straight surface, there is an advantage that it cannot be easily removed after locking.

[Brief description of drawings]

1A is a cross-sectional view of a case having a lock structure according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view of a modified example of the lock structure of FIG.

2A is a cross-sectional view of a case having a lock structure according to a second embodiment, and FIG. 2B is a cross-sectional view of a modified example of the lock structure of FIG.

3A is a cross-sectional view of a case having a lock structure according to a third embodiment, and FIG. 3B is a cross-sectional view of a modified example of the lock structure of FIG.

FIG. 4 is a sectional view of a case in which the upper case is covered on the outer side of the lower case.

FIG. 5 is a cross-sectional view of a case having a conventional lock structure.

[Explanation of symbols]

 11 Lower Case 11a Peripheral Walls 11b, 11k First Lock Recesses 11d, 11f, 11h Second Lock Recesses 11e, 11g, 11i, 11l Second Lock Protrusions 11x Projection 12 Upper Case 12a Peripheral Walls 12b, 12k First Lock Projections 12d, 12f, 12h Second locking projections 12e, 12g, 12i, 12l Second locking recesses

Claims (3)

[Claims] 1. A peripheral wall of a lower case and a peripheral wall of an upper case are covered so as to overlap each other, and vertically locked to an inner surface of the outer peripheral wall of the case and an outer surface of the inner peripheral wall of the case. In the case where the first locking concave-convex portion is formed, the first locking concave-convex portion is locked to the inner surface of the outer case and the outer surface of the inner peripheral wall of the case so that the first locking concave-convex portion does not come out in the lateral direction. A lock structure for a case, characterized in that a second locking concave-convex portion is formed. 2. The lock structure for a case according to claim 1, wherein the second locking concavo-convex portion is formed on both sides of the first locking concavo-convex portion which are engaged with each other above and below. 3. The second locking recess is formed as a recess having a semicircular shape, a semicircular shape, or a sawtooth cross section, while the second locking projection is a semicircular shape or a semicircular shape in cross section. The lock structure for a case according to any one of the preceding claims, wherein the lock structure is formed as a protrusion having any one of a sawtooth shape.