JP3077136B2 - Lock structure for assembled parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock structure for an assembled part, and more particularly to a lock structure for an assembled part which is not disengaged even when a load is applied to the assembled part.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a lock structure of a conventional assembled part has an engagement projection 3 provided on a first wall 2 of a bottomed case 1 made of a synthetic resin. And
The cover 4 assembled to the case 1 has an inclined surface 7 between the bottom surface 5 and the second wall 6. Further, an engagement piece 9 having a hole 8 with which the engagement protrusion 3 is engaged is provided on the second wall portion 6.

When the cover 4 is assembled to the case 1, the engagement projection 3 engages with the hole 8 to complete the assembly and fixation of the cover.

[0004]

The locking structure of such an assembled part is such that when a force as shown by an arrow A is applied to the inclined surface 7 of the cover 4, the second wall 6 bends outward, whereby There has been a problem that the engaging piece 9 comes off from the engaging projection 3. Therefore, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a lock structure of an assembled part which cannot be easily removed.

[0005]

According to the present invention, in order to achieve the above object, an engaging projection is provided on a first wall of one part, and the engaging projection is provided on a second wall of the other part. In addition to providing engagement pieces each having a hole to be fitted , the first wall portion
A notch portion corresponding to the engagement piece is provided;
Position Then together inside the first wall portion and the second wall portion before <br/> SL when but where the part engaging is assembled into the hole
Further, the engagement piece is located in the notch .

Further, the engaging projections to the first wall portion of one part, the inclined surface between the second wall portion and the bottom surface of the other part Yes
The engaging projection is provided with respective engagement pieces provided with a hole to be engaged with and the second wall portion, before the first wall portion
A notch corresponding to the engagement piece is provided, and the engagement protrusion is
Position Then together inside the second wall portion of the first wall portion when said parts are assembled engaged with the hole
Further, the engagement piece is located in the notch .

[0007]

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the lock structure of an assembled part according to the present invention, an engaging projection 3 is provided on a first wall 2 of a case 1 as one part, and a second part of a cover 4 as the other part. An engaging piece 9 having a hole 8 with which the engaging projection 3 engages is provided on the wall 6, and a notch 10 corresponding to the engaging piece 9 is provided on the first wall 2.
The case 1 and the cover
4 is assembled, the second wall portion 6 is located inside the first wall portion 2 and the engagement piece 9 is notched.
10 is located .

An engaging projection 3 is provided on the first wall portion 2 of the case 1, and has an inclined surface 7 between the second wall portion 6 and the bottom surface 5 of the cover 4. An engaging piece 9 having a hole 8 with which the engaging projection 3 engages is provided on the first wall 2.
A notch 10 corresponding to the mating piece 9 is provided, and the engaging projection 3 is
The case 1 and the cover 4 were assembled by engaging with the holes 8.
When the second wall portion 6 is located inside the first wall portion 2
At the same time, the engagement piece 9 is located in the notch 10 .

[0011]

[0012]

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In addition, the same reference numerals are given to the same and corresponding parts as those in the embodiment, and the detailed description thereof will be omitted.

A notch 10 is formed in a first wall 2 of a bottomed case 1 (one part) made of a synthetic resin. An engagement projection 3 is provided at a lower end of the notch 10. The cover 4 (the other part) assembled to the case 1 is provided with an inclined surface 7 between the bottom surface 5 and the second wall 6. Further, an engagement piece 9 having a hole 8 with which the engagement protrusion 3 is engaged is provided on the second wall portion 6. The engagement piece 9 is located in the notch 10 when the cover 4 is assembled to the case 1.

When the cover 4 is assembled to the case 1, the engagement projection 3 engages with the hole 8 to complete the assembly of the cover. At this time, the second
The wall portion 6 may be the entire wall portion of the cover 4 or the wall portion only in the engagement range may be located inside.

According to the above configuration, even if a force as shown by an arrow A is applied to the inclined surface 7 of the cover 4 and the second wall 6 bends outward, the second wall 6 abuts on the inside of the first wall 2. Second
The deformation of the wall portion 6 can be suppressed, and the engagement piece 9 can be prevented from coming off the engagement protrusion 3. Further, even when a force is applied to the first wall portion 2 of the case 1 and the first wall portion 2 is bent inward, the first wall portion 2 abuts on the second wall portion 6 to suppress deformation, and the engagement piece 9 Can be prevented from being disengaged from the engagement projections 3.

Further, since the notch 10 is provided in the first wall portion 2, the notch 10 serves as a guide member for the engaging piece 9, so that the case 1 and the cover 4 can be easily assembled. it can.

In this embodiment, the notch 10
The circuit board 11 is received by
Is placed. The end 13 of the second wall 6 of the cover 4 contacts the circuit board 11. The circuit board 11 is fixed between the receiving portion 12 and the end portion 13. With the above configuration, the circuit board 11 can be fixed.

When the circuit board 11 is not required, it is preferable that the second wall 6 is formed so as to extend and the end 13 is brought into contact with the receiving portion 12.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same and corresponding parts as those in the conventional example and the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The cover 4 of this embodiment does not have the inclined surface 7 of the first embodiment, and the second wall 6 of the cover 4 has an engaging piece 9 having a hole 8 with which the engaging projection 3 engages. Is provided. Engagement piece 9
Is formed so as to protrude from the same plane as the bottom surface 5 to the side of the cover 4 and extend downward. Reference numeral 14 denotes a rib provided to reinforce the engagement piece 9 so as not to bend.

When the cover 4 is assembled to the case 1 as in the first embodiment, the engagement of the engaging projections 3 with the holes 8 completes the assembly and fixing of the cover.

With the above structure, even if a force as shown by arrow B is applied to the bottom surface 5 and the second wall portion 6 is bent outward,
By contacting the inside of the first wall portion 2, the deformation of the second wall portion 6 is suppressed, and the engagement piece 9 can be prevented from coming off the engagement protrusion 3. Further, even when a force is applied to the first wall portion 2 of the case 1 and the first wall portion 2 is bent inward, the first wall portion 2 abuts on the second wall portion 6 to suppress deformation, and the engagement piece 9 Can be prevented from being disengaged from the engagement projections 3.

In this embodiment, a columnar projecting portion 12 is used as a receiving portion for mounting the circuit board 11 on the case 1.
Is provided. The positioning pin 1 is provided on the upper end of the protrusion 12.
5 is provided. The circuit board 11 has a through hole 16 corresponding to the positioning pin 15. Also,
The end 13 of the second wall 6 of the cover 4 contacts the circuit board 11. Then, the positioning pins 15 are inserted into the through holes 16, and the circuit board 11 is placed on the case 1, and
And the end portion 13 with the circuit board 11 sandwiched therebetween. With the above configuration, the circuit board 11 can be fixed.

When the circuit board 11 is not required, the cover 4 may be provided with a columnar member (not shown) corresponding to the projecting portion 12. Also, a second wall is provided inside the first wall 2.
A receiving portion that contacts the end portion 13 of the wall portion 6 may be formed to receive the end portion 13.

[0026]

As described above, according to the present invention, even if a force is applied to the component and the second wall portion is bent outward, the second wall portion is brought into contact with the inside of the first wall portion. Deformation is suppressed,
The engagement piece can be prevented from coming off the engagement protrusion.

Further, even if a force is applied to the inclined surface provided between the second wall and the bottom surface of the other part and the second wall is bent outward, the second wall is bent inside the first wall. The contact makes it possible to suppress the deformation of the second wall portion and prevent the engagement piece from coming off the engagement protrusion.

In addition, since the notch is provided in the first wall, the notch serves as a guide member for the engaging piece, and the components can be easily assembled.

Further, a receiving portion for mounting the circuit board on one of the components is provided, and the other component abuts on the circuit board at an end of the second wall portion, and the receiving portion and the end are connected to each other by the receiving portion and the end. The circuit board can also be securely fixed by sandwiching and fixing the circuit board.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a first embodiment of the present invention before assembly.

FIG. 2 is a perspective view of a main part after assembly of the embodiment.

FIG. 3 is a sectional view of the same embodiment.

FIG. 4 is a perspective view of a main part before assembling of a second embodiment of the present invention.

FIG. 5 is a perspective view of a main part after assembly of the embodiment.

FIG. 6 is a sectional view of the embodiment.

FIG. 7 is a perspective view of a main part of a conventional example before assembly.

FIG. 8 is a sectional view of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 1st wall part 3 Engagement protrusion 4 Cover 5 Bottom surface 6 Second wall part 7 Inclined surface 8 Hole 9 Engagement piece 10 Notch part 11 Circuit board 12 Receiving part (projection part) 13 End part

Claims (2)

(57) [Claims] An engaging projection is provided on a first wall of one of the components .
An engaging piece provided with a hole with which the engaging projection engages is provided on a second wall portion of the other part , and the first wall is
A notch portion corresponding to the engagement piece,
When the projection is engaged with the hole and the part is assembled
Position Then the second wall portion on the inner side of the first wall portion
In both cases, the engagement piece is located within the cutout portion, and the lock structure of the assembled component is provided. 2. An engaging projection on a first wall of one of the components .
Providing engaging piece of the engaging projection is provided with a hole for engaging the second wall portion before <br/> SL have a sloped surface between the second wall portion and the bottom surface of the other part, respectively With the first wall portion
A notch corresponding to the mating piece is provided, and the engagement protrusion is
When the part is assembled by engaging the hole, the second
Is located inside the first wall , and
A lock structure for an assembled part, wherein the engagement piece is located in the notch .