JPH09210024A - Locking mechanism for resin molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a bridge piece which deflects at the time of locking easier to deflect. SOLUTION: This locking mechanism 10c is constituted of an inserting type locking protrusion 7 which is formed at one member 3 and a locking hole 4 which is formed at the other member 2 and receives the locking protrusion 7. An engaged protrusion part 7a which protrudes in an orthogonal direction to an inserting direction A and a guide slope 7b which continues forward in the inserting direction A are formed on the side surface of the lock protrusion 7. At least one edge of a circumferential wall of the locking hole 4 deflects in the orthogonal direction to the inserting direction A by means of an action of the guide slope 7b by inserting the locking protrusion 7 and is constituted of a bridge piece 23 which engages with the engaged protrusion part 7a after passing the engaged protrusion part 7a. The middle part of the bridge piece 23 is curved into a U-shape or a V-shape in the inserting direction A of the locking protrusion 7, and an extension length between both ends of the bridge piece 23 is set longer than a straight distance between both ends of the bridge piece 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for resin molded products such as protectors for wire harnesses.

[0002]

2. Description of the Related Art A protector (molded resin product) 1A for a wire harness shown in FIG. 4 includes a bottom wall 2a and both side walls 2a.
2 g, a gutter-shaped main body 2 and a flat plate-shaped lid 3 that closes the upper opening of the main body 2.
An appropriate number of lock mechanisms 10A that lock each other in the closed state are provided.

Each lock mechanism 10A comprises a lock hole 4 on the main body 2 side and an insertion lock projection 7 on the lid 3 side.
The lock hole 4 is formed by integrating a bridge piece 5 having a U-shaped cross section on the outer surface of the upper end of the side wall 2b of the main body 2.
Further, the lock projection 7 is provided so as to project downward on the side edge of the lid 3 in the width direction, and is locked in the lock hole 4 by inserting the lock projection 7 downward. Arrow A indicates the insertion direction. The lock projection 7 has an engagement convex portion 7a protruding on the outer side surface in a direction orthogonal to the insertion direction A, and a guide slope 7b continuous to the front in the insertion direction.

In this protector 1A, when the lock protrusion 7 is inserted into the lock hole 4 when the main body 2 is closed by the lid 3, the guide slope 7b of the lock protrusion 7 slides on the bridge piece 5, thereby causing the bridge to move. The piece 5 is flexibly deformed in a direction orthogonal to the insertion direction A, and allows the engagement protrusion 7a to pass therethrough. Then, after passing through the engaging protrusion 7a, the bridge piece 5 returns to the original position to engage with the engaging protrusion 7a, and the lock mechanism 10A enters the locked state.

FIG. 5 shows an example in which a bridge piece cannot be provided on the outer surface due to layout restrictions or the like. In the lock mechanism 10B of the protector 1B, the lock holes 4 arranged on one side of the protector body 2 are formed by providing bridge pieces 13 in a bridging manner in the concave groove 12 formed on the outer surface of the side wall 2b of the body 2. . Groove 1
2, the lock protrusion 7 can be inserted, and the side wall 2
It is formed inward from the outer surface of b. And the side wall 2b
By providing the bridge piece 13 on the same surface as the outer surface of
A lock hole 4 into which the lock protrusion 7 can be inserted is formed.

Also in the case of this protector 1B, when the lock projection 7 is inserted into the lock hole 4 when closing the main body 2 with the lid 3, the guide slope 7b of the lock projection 7 is made into the bridge piece 13.
Slides in the direction A, which causes the bridge piece 13 to move in the insertion direction A
It bends and deforms in a direction orthogonal to the above, and allows the engagement convex portion 7a to pass therethrough. Then, after passing through the engaging convex portion 7a, the bridge piece 13
Returns to its original position, engages with the engaging protrusion 7a,
The lock mechanism 10B is locked.

[0007]

The former lock mechanism 10A (see FIG. 4) in which the lock hole 4 is formed by the bridge piece 5 having a U-shaped cross section is shown in FIGS. 6 (a) and 6 (b). As described above, since the extension length L1 of the bending portion of the bridge piece 5 is long, it can be easily bent, but the lock hole 4
In the case of the latter lock mechanism 10B (see FIG. 5) in which the lock is formed inward from the outer surface of the side wall 2b, as shown in FIG.
As shown in (a) and (b), since the length L2 of the bending portion of the bridge piece 13 becomes short, there is a problem that it is difficult to bend. Therefore, there is a possibility that the bridge piece 13 may be deteriorated due to repeated deformation during locking.

In view of the above circumstances, it is an object of the present invention to provide a locking mechanism for a resin molded product, which can make the bridge piece easy to bend and consequently prevent the deterioration of the bridge piece.

[0009]

According to a first aspect of the present invention, there is provided a lock projection provided on one member and a lock hole provided on the other member for receiving the lock projection. Is provided with an engaging protrusion protruding in a direction orthogonal to the inserting direction and a guide slope continuous to the front in the inserting direction, and at least one side of the peripheral wall of the lock hole is guided by inserting the lock protrusion. In a lock mechanism for a resin molded product, which is formed by a bridge piece that bends in the direction orthogonal to the insertion direction by the action of the inclined surface and that engages with the engagement protrusion after passing through the engagement protrusion, the bridge piece is curved. The extension length between both ends of the bridge piece is set to be longer than the linear distance between both ends of the bridge piece.

In this lock mechanism, since the length of the bridge piece is increased by bending the bridge piece, the bridge piece is more easily bent. Further, when the lock protrusion is inserted into the lock hole, the inclined portion of the curved bridge piece guides the guide slope.

A second aspect of the present invention is the lock mechanism for a resin molded product according to the first aspect, wherein the middle portion of the bridge piece is curved in a U-shape or a V-shape in the inserting direction of the lock protrusion. It is characterized by

In this lock mechanism, since the length of the bridge piece is increased by bending the bridge piece in a U-shape or a V-shape, the bridge piece is more easily bent. Further, when the lock protrusion is inserted into the lock hole, the inclined portion of the curved bridge piece guides the guide slope.

According to a third aspect of the present invention, there is provided a lock mechanism for a resin molded product according to the first or second aspect, wherein a recessed groove into which a lock projection can be inserted is provided on an outer surface of a side wall of the other member. The lock hole is formed by providing the bridge piece in a bridge shape.

In this locking mechanism, the bridge piece is simply bridged in the groove, and although the transverse length itself is short, the bridge piece is curved in a U-shape or a V-shape. The length of the flexible portion becomes long.

According to a fourth aspect of the present invention, there is provided the lock mechanism for a resin molded product according to the first or second aspect, wherein the bridge member having a U-shaped cross section is provided on the outer surface of the side wall of the other member. It is characterized in that holes are formed.

In this lock mechanism, since the bridge piece has a U-shaped cross section, the length of the bridge piece is long, but the bridge piece is further curved in a U shape or a V shape. Therefore, the substantial length of the bridge piece becomes longer, and the bridge piece becomes easier to bend.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall perspective view of a protector (resin molded product) 1C shown as an embodiment of the present invention, and FIG. 2 is a perspective view of a lock hole 4 portion on a main body 2 side which constitutes the lock mechanism 10C. This protector 1C is configured as an improved product of the protector 1B of the type shown in FIG.

In this protector 1C, the recessed groove 12 into which the lock projection 7 can be inserted is formed on the outer surface of the side wall 2b of the main body 2, and the bridge piece 23 bridges between the ends of the recessed groove 12. And the lock hole 4 is formed thereby. The bridge piece 23 has a lock hole 4
It constitutes one side of the peripheral wall and is arranged in the same plane as the side wall 2b. The middle portion of the bridge piece 23 is curved in a V-shape (or U-shape) in the insertion direction A of the lock protrusion 7, and the extension length L3 between the both ends 23a of the bridge piece 23, 23a is Both ends 23a, 23a of the bridge piece 23
It is set longer than the straight line distance between them.

In this case, the bridge piece 23, as shown in the front view in FIG. 3, is formed at the center in the length direction and is flat in a direction orthogonal to the inserting direction A for engaging with the engaging projection 7 of the lock projection 7. The portion 23b and the inclined portions 23c and 23c on both sides thereof are formed in a V shape.

In this lock mechanism 10C, the bridge piece 2
By bending 3 into a V-shape (or U-shape), the extension length of the bridge piece 23 is increased, so that the bridge piece 23 is more easily bent. Therefore, even when the lock protrusion 7 is inserted, no undue deformation occurs, and damage due to the deformation is prevented. Further, when the lock protrusion 7 is inserted into the lock hole 4, the inclined portions 23c and 23c of the bridge piece 23 curved in a V-shape (or a U-shape) are locked by the lock protrusion 7.
Since it guides the guide slope 7b, the assembly workability is improved.

In the present embodiment, the case where the present invention is applied to the lock mechanism in which the lock hole 4 is retracted inward from the outer surface of the side wall 2b is shown. However, as shown in FIG. The present invention can also be applied to the lock mechanism 10A in which the lock hole 4 is configured by the U-shaped bridge piece 5 protruding outward from the outer surface. In that case, since the bridge piece has a U-shaped cross-section, the length of the bridge piece is long, but the bridge piece is further curved into a U-shape or a V-shape so that the bridge piece is substantially formed. The length is longer, and the more flexible it is. As a result, the width of the lock hole 4 can be reduced.

The lock mechanism of the present invention can be applied to lock mechanisms for various purposes other than the protector.

[0024]

As described above, according to the invention of claim 1, since the bridge piece forming at least one side of the peripheral wall of the lock hole is curved in the inserting direction of the lock projection, the extension length of the bridge piece is increased. Becomes longer, and the bridge piece is more easily bent. Therefore, the bridge piece is not unduly deformed when locked, and damage due to the deformation is prevented.
Further, when the lock projection is inserted into the lock hole, the inclined portion of the curved bridge piece guides the guide slope, so that the assembling workability is improved.

According to the invention of claim 2, since the bridge piece forming at least one side of the peripheral wall of the lock hole is curved in a U-shape or a V-shape in the inserting direction of the lock protrusion,
The extension length of the bridge piece is increased, and the bridge piece is more easily bent. Therefore, the bridge piece is not unduly deformed when locked, and damage due to the deformation is prevented. Further, when the lock protrusion is inserted into the lock hole, the sloped portion of the bridge piece curved in a U shape or a V shape guides the guide slope, so that the assembling workability is improved.

According to the invention of claim 3, since the bridge piece is only bridged to the groove, the cross-sectional length itself is short, but the bridge piece is curved in a U shape or a V shape. As a result, the length of the extension is substantially increased, which facilitates bending. As a result, the same effect as the invention of claim 1 is obtained.

According to the fourth aspect of the present invention, since the bridge piece has a U-shaped cross section, the extension length of itself is long, but the bridge piece is further U-shaped or V-shaped. Since it is curved, the substantial length of the bridge piece becomes long, and the bridge piece becomes more flexible. Therefore, in addition to the same effect as the first aspect, the width of the lock hole can be reduced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a protector including a lock mechanism according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the protector including the lock mechanism according to the embodiment of the present invention on the main body side.

FIG. 3 is a front view showing the shape of a bridge piece on the lock hole side in the lock mechanism according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a first conventional example.

FIG. 5 is a perspective view showing a second conventional example.

FIG. 6 is a block diagram of the lock hole side of the first conventional example, (a)
Is a perspective view and (b) is a view seen from above.

FIG. 7 is a block diagram of a lock hole side of a second conventional example, (a)
Is a perspective view and (b) is a view seen from above.

[Explanation of symbols]

 1C protector (resin molded product) 2 main body (other member) 2b side wall 3 lid (one member) 4 lock hole 7 lock protrusion 7a engaging protrusion 7b guide slope 10C locking mechanism 12 concave groove 23 bridge piece

Claims (4)

[Claims] 1. A plug-type locking protrusion provided on one member, and a lock hole provided on the other member for receiving the locking protrusion, the side surface of the locking protrusion being in a direction orthogonal to the inserting direction. A protruding engagement protrusion and a guide slope that is continuous forward in the insertion direction are provided, and at least one side of the peripheral wall of the lock hole is a direction orthogonal to the insertion direction due to the action of the guide slope by inserting the lock protrusion. In a lock mechanism for a resin molded product, which is formed by a bridge piece that bends to the end and engages with the engagement protrusion after passing through the engagement protrusion, the bridge piece is curved, and an extension length between both ends of the bridge piece is provided. Is set longer than the straight line distance between both ends of the bridge piece. 2. The lock mechanism for a resin molded product according to claim 1, wherein an intermediate portion of the bridge piece is curved in a U-shape or a V-shape in the inserting direction of the lock protrusion. Locking mechanism for resin molded products. 3. The lock mechanism for a resin molded product according to claim 1, wherein a recessed groove into which a lock projection can be inserted is provided on an outer surface of a side wall of the other member, and the recessed groove is bridge-shaped. A lock mechanism for a resin molded product, wherein the lock hole is formed by providing a bridge piece. 4. The lock mechanism for a resin molded product according to claim 1 or 2, wherein the lock hole is formed by providing the bridge piece having a U-shaped cross section on an outer surface of a side wall of the other member. A locking mechanism for resin molded products that is characterized by