JP2003125515A - Structure for preventing wrong insertion of grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple structure that can prevent misinsertion of a grommet and that can improve ease of assembling the grommet. SOLUTION: In a structure for preventing misinsertion of the grommet 1, which is inserted and mounted from an opening side of an opening 22 into the opening 2 formed at an end part 21B of a fixing member 21A, another structure 25, in which the grommet 1 is inserted wrongly and mounted, when the position of starting the insertion of the grommet 1 moves in the direction that crosses perpendicular to the opening surface 21, is provided on the grommet 1 and/or the fixing member 21. Members for preventing misinsertion of the grommet 1, at least in the midst of the insertion, are provided on the grommet 1 and/or the fixing member 21. Projections 11, 12, 31, 32 provided on the fixing member 21, into which the grommet 1 is misinserted, and/or grommet 1 function as misinsertion preventing members, and a plurality of these projections are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in an opening formed at an end of a fixing member, and allows wiring to pass through the opening while protecting wiring to prevent moisture and dust from entering through the opening. It is about grommets.

[0002]

2. Description of the Related Art In recent years, in vehicles such as passenger cars, not only environmental protection, fuel consumption improvement and running performance improvement, but also
Various electronic technologies are used to improve the comfort and convenience of the vehicle, as well as crime prevention, and various electronic components are mounted to realize this control. Therefore, the electronic parts mounted on the vehicle are mounted not only around the driver's seat in the passenger compartment but also in the rear seats and doors. Along with this, there is a tendency that wiring paths for connecting electronic components to each other also become complicated, and wiring such as a harness is stretched around in detail in the vehicle body.

Depending on the arrangement of electronic components in the above-mentioned wiring path, there is a case where the frame has to be penetrated from the inside of the vehicle to be wired to another frame. In such a case, the wiring such as the harness is exposed between the frames, and the exposed wiring may be disconnected due to sharp burrs left uncorrected in the through holes of the frame. was there. Also, because the frame has a through hole, it becomes easy for moisture and dust to enter through the through hole, and the equipment and parts protected by the frame are directly affected by the poor environment outside the frame. I will end up.

Therefore, when a wiring is passed through by providing a through hole in a frame or the like, a part called a grommet is generally used, and the grommet is used to protect the wiring while ensuring waterproof and dustproof properties. ing.

That is, most of the grommets are formed of an elastically deformable material such as rubber or synthetic resin, and are formed in a circular hollow donut shape corresponding to the shape of the through hole. Depending on the installation location, a large number of grommets having a rectangular shape and an L-shaped cross section or a bellows-shaped portion are also used.

The grommet is mounted in the through hole of the frame, and the wiring passes through the through hole through the grommet to protect the wiring such as the harness between the frames and maintain the waterproof and dustproof property of the frame. I am trying.

As a kind of the above-mentioned grommet, a grommet used for a storage box accommodating a device composed of electric parts and the like is known.

That is, as shown in FIG. 10, a part of this storage box is a box body 21 having an upper opening for accommodating the apparatus.
And an upper lid (not shown) that closes the opening of the box body 21.

The side wall 21A of the box body 21 is provided with an opening 22 cut out from the opening end 21B above the side wall 21A. The opening 22 is slid from the end 21B side to form a grommet. It is configured to mount 51. Further, the grommet 51 includes an insertion portion 53 that seals between the wiring 30 and the grommet 51.

In addition, when the grommet 51 is mounted with an upper lid, which is a lid, on the storage box 20 after mounting, the upper lid prevents the grommet 51 from coming off from the opening 22 and opens. It is adapted to be fixed to the portion 22.

That is, in this grommet 51, the distal end portion in the insertion direction is formed into a curved shape in accordance with the shape of the opening 22, and the base end portion continuous to the distal end portion is removed from the end portion 20B after the assembling. It has a rectangular shape with a slightly protruding length. Also, on the side surface of the grommet 51, the box body 2
A recess 55 that fits around the periphery of the first opening 22 is provided.

Therefore, the grommet 51 is attached to the opening 22.
Then, when the upper lid is attached to the storage box 20, the base end side of the grommet 51 is closed by the upper lid, and the grommet 51 slides in the opposite direction to the insertion direction and is removed from the opening 22. Is prevented. Along with this, since the base end side of the grommet 51 is pressed in the insertion direction by the upper lid body, the curved portion on the tip end side of the grommet 51 is pressed toward the opening 22 side, the gap between the two is eliminated, and the grommet 51 and the opening 22 are formed. Waterproof and dustproof between and.

[0013]

However, in the grommet 51 having the above-described structure, the grommet 51 itself has a plurality of recesses other than the recess 55 in its peripheral portion, or is orthogonal to the opening of the opening 22. In the case where an opening having a shape similar to the opening of the opening 22 is formed at a location near in the direction, the position where the insertion of the grommet 51 is started is not directly above the opening of the opening 22 and If the position shifts even slightly in the direction orthogonal to the opening, the grommet 51 may be attached to the opening having a similar shape, or a recess other than the recess 55 of the grommet 51 may be fitted into the opening 22. However, since the grommet 51 is not properly attached to the opening of the opening 22, the grommet 51 cannot provide the waterproof / dustproof property. Convenience has occurred.

That is, as an example in which an opening similar to the opening of the opening 22 is formed, for example, the protective wall 2
A configuration in which 5 is provided in the box body 21 is known. In this structure, relatively high pressure cleaning water is directly or indirectly sprayed on the contact portion between the grommet 51 exposed to the outside and the peripheral edge of the opening 22 by the cleaning operation or the like, and the grommet 51 is deformed from the peripheral edge. Therefore, the waterproof / dustproof property of the grommet 51 may be deteriorated. Therefore, in order to prevent this, the protective wall 25 is provided to protect the contact portion.

The protective wall 25 is the side wall 21 of the box body 21.
The outer surface of A has an L-shaped cross section, is formed to surround the opening peripheral edge of the opening 22 and at a predetermined distance from the opening peripheral edge, and has a shape similar to the opening shape of the opening 22. An opening peripheral edge 26 is formed.

Therefore, in the grommet 51 having the structure of the protection wall 25, as shown in FIG. 11A, the grommet 51 can be properly assembled to the opening 31, and As shown in FIG. 11B, since the grommet 51 can be erroneously inserted and assembled to the protective wall 25, when the grommet 51 is assembled to the protective wall 25, waterproofing by the grommet 51 is performed.
The dustproof property cannot be obtained.

Further, as shown in FIG. 12A, the grommet 51 is properly assembled to the opening 22, and as shown in FIG. 12B, the grommet 51 is attached to the protective wall 25. The mistakenly assembled state is confusing and tends to be difficult to distinguish. further,
Even when the grommet 51 is erroneously assembled to the protective wall 25, the base end of the grommet 51 has the opening end 2 of the box body 21.
Since it slightly protrudes upward from 1A, the upper lid can be attached to the box body 21, and the assembling of the storage box will be completed normally.

In particular, for example, when the grommet 51 having the above-mentioned configuration is used in a storage box mounted in an engine compartment of a vehicle to store electric parts, it is regarded as a finished product while the grommet 51 is erroneously inserted. There was a risk of becoming.

That is, in the work of mounting the storage box in the engine room, first, the box body 21 of the storage box is assembled and fixed in the engine room, and then the electronic unit such as electric parts is stored in the storage box. While accommodating the item, the grommet 51 with the harness inserted is assembled to the box body 21, the harness and the item are connected by a connector, and finally the storage box 20
The upper lid is attached to the box body, and the box body 21 is sealed by the upper lid.

When this work is carried out by the assembly line of a vehicle of the flow work system, it is general that this work is divided into a plurality of steps and each of these steps is carried out by an individual worker. When the assembly location of the grommet 51 is difficult for the assembly operator to visually recognize due to the installation position of the storage box in the engine compartment, the orientation of the installed storage box, the external shape of the storage box itself, etc. It is easy to cause improper assembly.

Further, it is difficult for an operator in the process after assembling the grommet 51 to find and correct such an erroneous assembly because both are confusing and the work contents are different. is there.

Further, each opening 22 of each grommet 51
Performing sufficient confirmation work to determine whether or not each product has been properly assembled will complicate the assembly work.
This is also a factor in reducing the line speed of the assembly line, which is not preferable in terms of productivity.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a grommet capable of preventing erroneous insertion of the grommet with a simple structure and improving the assembling property of the grommet. .

[0024]

In order to achieve the above-mentioned object, the invention of claim 1 inserts into the opening formed at the end of the fixing member from the opening side of the opening. In the structure that prevents the erroneous insertion of the grommet installed by
Either or both of the grommet and the fixing member are provided with another structure that is erroneously inserted and mounted when the position to start inserting the grommet moves in a direction orthogonal to the opening surface of the opening. The grommet erroneous insertion prevention structure is characterized in that at least one or both of the grommet and the fixing member are provided with a prevention member for preventing erroneous insertion of the grommet during the insertion thereof.

Therefore, according to the invention of claim 1, since the prevention member for preventing the erroneous insertion of the grommet is provided during the insertion, the erroneous insertion of the grommet is prevented, and the quality of the assembly of the grommet is guaranteed. Can be improved.

In addition, for example, when the grommet having the above-mentioned configuration is applied to a storage box for housing electrical parts and mounted in the engine room, and the work of mounting the storage box in the engine room is performed on a vehicle assembly line. Since the erroneous insertion does not occur, the work of assembling the grommet into the storage box is easy, so the required work time is shortened, and the line speed of the vehicle assembly line can be increased, thus improving productivity. Can be improved.

According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the prevention member is a protrusion provided on the fixing member and protruding in a path where the grommet is erroneously inserted. This is a featured grommet erroneous insertion prevention structure.

According to the invention of claim 2, claim 1
In addition to obtaining the same effect as the invention of the above, if the grommet is mistakenly assembled, the grommet comes into contact with the protrusion of the fixing member during the insertion, and further grommet moves in the insertion direction. Since it is prevented from doing so, the base end of the grommet is largely projected upward from the end of the fixing member, and it can be clearly discerned by visual inspection or the like that the grommet was erroneously attached to other than the opening. Therefore, if you try to assemble the grommet by mistake and it is blocked midway, the base end of the grommet protrudes from the end of the fixing member, and you can clearly determine by mistake that the grommet was incorrectly installed in a place other than the opening. Therefore, this can be easily corrected and the grommet can be surely reassembled in the opening.

Further, in a third aspect of the invention, in the structure of the first aspect of the invention, the prevention member is a protrusion provided on the grommet and abutting against another member in the middle of a path where the grommet is erroneously inserted. It is a structure for preventing erroneous insertion of grommets, which is characterized by the fact that

Therefore, according to the invention of claim 3, in addition to the same effect as that of the invention of claim 2, the protrusion is provided on the grommet side to prevent the grommet from being erroneously inserted. Therefore, it is possible to prevent the erroneous insertion of the grommet by applying the grommet provided with the protrusion of the invention of the present invention to the fixing member having the conventional structure.

Further, in a fourth aspect of the invention, in the configuration of the first aspect of the invention, the prevention member is provided on the grommet and the fixing member, and the projections are brought into contact with each other while the grommet is erroneously inserted. Is a structure for preventing erroneous insertion of grommets.

Therefore, according to the invention of claim 4, in addition to obtaining the same effect as that of the invention of claim 2, the protrusions are provided so as to come into contact with each other on the grommet and the fixing member during the erroneous insertion of the grommet. With the configuration in which the projections are provided, the locations where the projections abut each other can be arbitrarily set depending on the direction and the length of the projections, so that the restrictions on the locations where the projections are provided can be relaxed.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the present invention will be described below with reference to the drawings. 1 is a perspective view before assembly showing a specific example of the structure for preventing the incorrect insertion of the grommet of the present invention, FIG.
Is a plan view showing the grommet and the vicinity of the opening of the box body,
FIG. 3 shows an assembled state, (a) is a perspective view of a properly assembled state, and (b) is a perspective view of an improperly assembled state. In the example shown here, an example in which the grommet 1 is applied to a storage box that is a housing for housing electronic components (not shown) will be described. This storage box is composed of a box body 21 formed in a box shape with an open upper side and an upper lid body (not shown) which is a lid member, and at least the contents are stored in the box body 21. After assembling the grommet 1,
By attaching the upper lid to the box body 21, the box body 2
The upper opening of 1 is closed, and the assembly of the storage box is completed.

The grommet 1 is mounted in an opening 22 provided by cutting out an opening end 21B of a side wall 21A which is a part of the box body 21, and the electronic components housed in the storage box 21 and external electronic equipment. A harness (not shown) that bundles wires for electrically connecting parts and the like is protected, and the waterproof and dustproof property of the storage box 21 is ensured.

The opening 22 is formed such that its opening shape is formed by joining a downward semi-circle and a rectangle having the same long side as the bottom of the semi-circle. The side is formed so as to match the opening end portion 21B on a straight line.

The grommet 1 of this example has an opening 22.
An example applied to a structure in which an opening having a shape similar to the opening of the opening 22 is formed in the vicinity of the opening will be described.

That is, the protection wall 25 is formed around the opening 22 so as to have an L-shaped cross section, surrounds the opening edge of the opening 22, and is formed at a predetermined distance from the opening edge. Is provided, and the opening shape of the opening peripheral edge 26 on the inner side is similar to the opening shape of the opening 22.

Therefore, the protective wall 25 prevents relatively high-pressure cleaning water from washing work from being sprayed on the peripheral edge of the contact portion between the grommet 1 and the opening 22, and the grommet 1 can be used for waterproofing. It is designed to maintain dust resistance.

The grommet 1 is composed of a grommet body 2 assembled and fixed in the opening 22 of the box body 21, and an insertion portion 3 for holding wiring. The grommet 1 is made of an elastically deformable and insulating material such as synthetic resin or rubber.

The insertion part 3 is formed of a through hole that penetrates the grommet main body 2 and reaches the back of the grommet main body 2 in the approximate center of the grommet main body 2. The through hole holds the intermediate portion of the harness. There is. Therefore, the insertion portion 3 stably holds the harness in which the wires are bundled, and prevents moisture and dust from passing through the through hole of the insertion portion 3 while allowing the harness to pass through the insertion portion 3. ing.

The outer shape of the grommet body 2 is
A semicircular tip that is formed in a predetermined large shape similar to the opening shape of the opening 22 and is curved according to the shape of the lower side of the opening 22, and a rectangular shape that is continuous with the tip. And a proximal end portion that is formed.

Further, the length of the base end portion in the vertical direction is formed to be slightly longer than the length of the linear portion of the opening 22.
After mounting the grommet 1 in the opening 22, the upper end of the base end of the grommet main body 2 is the open end 10A of the box main body 21.
It is designed to slightly project from the end face of the. Therefore, when the upper lid is attached to the storage box after the grommet 1 is assembled, the base end side of the grommet is pushed in the insertion direction by the upper lid so that the pressing force is applied to the curved surface of the grommet main body 2 on the tip side. I have to.

When the upper lid (not shown) closes the upper opening of the box body 21, the upper end of the base end of the grommet body 2 which is a part of the upper opening is also closed, and the base end. Waterproof and dustproof property of the upper end of the shall be ensured.

Further, on the side surface of the grommet main body 2, there is provided a fitting portion 4 which is fitted to the periphery of the opening 22. The width of the fitting portion 4 is equal to that of the side wall 21 of the box body 21.
It is formed sufficiently larger than the thickness of A. Also,
An angular recess 5 having a width and depth slightly smaller than the wall thickness of the side wall 21A of the box main body 21 over the longitudinal direction of the side surface of the grommet main body 2 substantially at the center of the fitting portion 4 in the width direction. Is provided.

Therefore, when the grommet 1 is assembled in the opening 22, the recess 5 of the fitting portion 4 is spread by the peripheral edge of the opening 22, and the side wall and the bottom surface of the recess 5 come into close contact with the peripheral edge of the opening 22. As a result, the gap between the two is eliminated to ensure waterproofness and dustproofness.

Furthermore, when the grommet 1 is erroneously inserted and is to be assembled to the protective wall 25, at least one protrusion that interferes with the grommet 1 so that the grommet 1 is in an incompletely inserted state, The grommet 1 is provided at an appropriate location on the protective wall 25 which is a structural member to be erroneously assembled and attached.

That is, when the protrusion 31 is provided at a predetermined position of the protective wall 25 and the grommet 1 is to be inserted into the protective wall 25 which is an improper assembly site, the grommet 1 stops during the insertion. I am trying to do it.

The protrusion 31 is a surface parallel to the side wall 21A exposed to the outside of the protection wall 25, and extends from the wall of the protection wall 25 by a predetermined amount from the center edge of the opening edge to the lower corner. , Is formed so as to have a projecting angular cross-sectional shape.

Therefore, since the projection 31 is formed as a projection along the inserting direction of the grommet 1, sufficient strength against the pressing force along the inserting direction is secured to the projection 31. When the grommet 1 is erroneously inserted and the tip of the grommet 1 comes into contact with the protrusion 31,
Further movement of the grommet 1 in the insertion direction can be prevented, and further, even if the upper lid of the storage box is attached to the box main body 21 while the grommet 1 is erroneously inserted, the upper lid cannot be closed. Further, by forming the protrusions 31 in this way, the strength of the protective wall 25 around which the protrusions 31 are provided is improved, so that the protective wall 25 can be prevented from being deformed by external force or the like. ing.

As described above, according to the grommet erroneous insertion preventing structure of this example, the position at which the insertion of the grommet 1 is started is located immediately above the opening 22, as shown in FIG. 4 (a). When the grommet 1 is slid from this position in the insertion direction on the opening 22 side, as shown in FIGS. 3A and 4B, the grommet 1 is inserted into the opening 22 with respect to the movement. Projection 3 of protective wall 25
Since 1 does not interfere, the sliding movement of the grommet 1 is continued, and the leading end of the grommet 1 in the insertion direction is brought into contact with the opening 22 and stopped.

Therefore, the grommet 1 is properly assembled to the opening 22 with the base end of the grommet 1 slightly protruding upward from the opening end 21B of the box body 21.
Then, after that, the upper lid is attached to the box body 21 to complete the assembly of the storage box. At the same time, the upper lid presses the base end side of the grommet 1 in the insertion direction, so that the gap between the grommet 1 and the opening 22 is eliminated, and the waterproof / dustproof property of the grommet 1 is secured.

On the other hand, as shown in FIG. 5 (a), when the position to start inserting the grommet 1 is slightly displaced to the protective wall 25 side and the grommet 1 is erroneously assembled to the protective wall 25. As shown in FIG. 3 (b) and FIG. 5 (b), the tip portion of the grommet 1 has a protruding portion 3 during its insertion.
Since it is abutted against 1 and further movement of the grommet 1 in the insertion direction is prevented, the base end of the grommet 1 is largely projected upward from the open end 21B of the box body 21,
It is possible to clearly determine by visual inspection that the grommet 1 has been erroneously attached to the protective wall 25.

Further, even if the upper lid is attached to the box body 21 in this mis-assembled state, the base end of the grommet 1 is largely projected upward from the opening end 21B, and the upper lid cannot be attached. It can be determined that the attachment is incorrect.

Therefore, in the case where the grommet 1 is erroneously attempted to be attached to the protection wall 25 and is blocked midway in this way, the base end of the grommet 1 is projected from the open end 21B, and is visually or by the upper lid. Since the body cannot be attached, it is possible to clearly determine that the grommet 1 has been erroneously attached to the protective wall 25. Therefore, this can be easily corrected and the grommet 1 can be securely attached to the opening 22. The assurance of the assembly quality is secured, and the reliability of the waterproof / dustproof performance of the grommet 1 can be improved.

That is, for example, when the grommet 1 having the above-mentioned configuration is used for a storage box for storing electric parts and the work for mounting the storage box in the engine compartment is performed on a vehicle assembly line, one of the storage boxes is used. Since the workability of assembling the grommet 1 to the box body 21 which is a part is improved, the required work time is shortened, the line speed of the vehicle assembly line can be increased, and the productivity is improved. You can

The outer edge of the fitting portion 4 of the grommet 1 and the projection 31 of the protection wall 25 are in contact with each other, and the bottom peripheral surface of the recess 5 of the fitting portion 4 located at the tip of the insertion side and the protection wall 25. Since the unnecessary damage to the bottom peripheral surface is avoided by not making contact with the opening peripheral edge 26, the close contact between the recess 5 and the opening 22 can be ensured, and the sealing performance of the grommet 1 can be maintained. .

The location where the protrusion 31 is provided on the protective wall 25 depends to some extent on the shape of the opening peripheral edge 26 of the protective wall 25, but the shape of the opening peripheral edge 26 is almost the same as the opening shape of the opening 22. For example, any distance may be used as long as it is within the distance range from the opening peripheral edge 26 to the depth of the recess 5 provided in the fitting portion 4 of the grommet 1.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7.

The grommet erroneous insertion preventive structure of this embodiment is constructed such that the grommet 1 side is provided with a protrusion 11 for preventing the grommet 1 from being erroneously inserted.

When the grommet 1 is inserted into the protective wall 25, which is an improperly assembled part, the protrusion 11 stops the grommet 1 during the insertion.
It is provided at a predetermined location on the grommet body 2.

That is, this protrusion 11 is shown in FIG.
On the side of the grommet 1 shown in Fig. 2, the grommet body 2 faces the inner side of the box body 21 when the grommet body 2 is mounted in the opening 21 so that the grommet body 2 faces the inside of the box body 21. The grommet 1 is formed into a ridge having a predetermined length from the approximate center of the end of the curved portion, which is the most distal end in the insertion direction, along the direction opposite to the insertion direction.

Therefore, by forming the protrusion 11 as a ridge along the inserting direction of the grommet 1, sufficient strength against the pressing force along the inserting direction is secured to the protrusion 11, which will be described later. Even when the grommet 1 is erroneously inserted and the protrusion 11 of the grommet 1 is brought into contact with the opening 22, it is possible to prevent further movement of the grommet 1 in the inserting direction, and further, the grommet 1 is erroneously inserted. Even if the upper lid of the storage box is attached to the box body 21 as it is, the upper lid cannot be closed.

As described above, according to the grommet erroneous insertion preventing structure of this example, the position at which the grommet 1 starts to be inserted is located immediately above the opening 22, as shown in FIG. 6 (a). When the grommet 1 is slid from this position in the insertion direction on the opening 22 side, as shown in FIG. 6B, the protrusion of the protection wall 25 against the movement of inserting the grommet 1 into the opening 22. Since 31 does not interfere, the sliding movement of the grommet 1 is continued, and the leading end of the grommet 1 in the insertion direction is brought into contact with the opening 22 and stopped.

Therefore, the grommet 1 is properly attached to the opening 22 with the base end of the grommet 1 slightly protruding upward from the opening end 21B of the box body 21.
Then, after that, the upper lid is attached to the box body 21, whereby the assembling of the storage box is completed and the waterproof and dustproof property of the grommet 1 is secured.

On the other hand, as shown in FIG. 7A, when the position to start inserting the grommet 1 is slightly deviated to the protective wall 25 side and the grommet 1 is mistakenly assembled to the protective wall 25. As shown in FIG. 7 (b), the protrusion 11 of the grommet 1 abuts the inner circumference of the opening 22 during the insertion, and further insertion movement is prevented, so that the base end of the grommet 1 is prevented. Is largely protruded upward from the opening end 21B of the box body 21, and it can be clearly discriminated from the mistaken mounting by visual inspection or the like.

Further, even if the upper lid is attached to the box body 21 in this mis-assembled state, since the base end of the grommet 1 is largely projected upward from the opening end 21A, the upper lid cannot be closed. It is possible to determine that the attachment is incorrect.

Further, the protrusion 11 provided on the grommet 1
And the portion of the opening 22 facing this is contacted, while the bottom peripheral surface of the recess 5 of the fitting portion 4 located at the tip on the insertion side and the opening peripheral edge 26 of the protective wall 25 are not contacted. Therefore, since unnecessary damage to the bottom peripheral surface is avoided, the recess 5
It is possible to secure the close contact between the opening 22 and the opening 22 and maintain the sealing performance of the grommet 1.

As described above, according to the structure of the other specific example, in addition to the effect similar to that of the above specific example, the protrusion 11 for preventing the erroneous insertion of the grommet 1 is provided on the grommet 1 side. By providing the box body 21, it is not necessary to change the configuration of the box body 21, so that the grommet 1 of this example can be applied to the box body 21 of the conventional configuration to prevent erroneous insertion, and the range of application of this example is expanded. can do.

After the grommet 1 is properly assembled in the opening 22, the protrusion 11 provided on the grommet 1 is located inside the storage box 21, so that the appearance is not uncomfortable. It is possible to avoid unnecessary damage to the protrusion 11.

Further, another embodiment of the present invention will be described with reference to FIGS. 8 and 9.

The erroneous insertion prevention structure of the grommet of this example is configured such that the protrusion 12 and the protrusion 32 for preventing the erroneous insertion of the grommet 1 are provided on the grommet 1 side and the box body 21 side, respectively. .

That is, the protrusion 12 on the grommet 1 side
As shown in FIG. 8 (a), is the surface of the grommet body 2 that faces the inside of the box body 21 when the grommet body 2 is mounted in the opening 21, and the curve that is the most distal end in the inserting direction of the grommet 1. It is provided at a substantially central portion of the end of the portion, the tip of which protrudes downward in an L-shape from at least a position above the depth of the recess 5 of the grommet 1.

On the other hand, the protrusion 32 on the side of the box body 21 is a substantially central portion of the peripheral edge of the opening 22 on the inner side surface of the side wall 21A.
At least, the tip of the grommet 1 is provided so as to project in an upward L-shape from a position below the depth of the recess 5 of the grommet 1.

As described above, according to the grommet erroneous insertion preventing structure of this example, the position at which the grommet 1 starts to be inserted is positioned immediately above the opening 22, as shown in FIG. 8 (a). When the grommet 1 is slid from this position in the insertion direction on the opening 22 side, as shown in FIG. Since 32 does not interfere, the sliding movement of the grommet 1 is continued, and the leading end of the grommet 1 in the insertion direction is brought into contact with the opening 22 and stopped. Therefore, since the grommet 1 is properly assembled to the opening 22 with the base end of the grommet 1 slightly protruding upward from the opening end 21B of the box body 21, the upper lid is then attached to the box body 21. By mounting, the assembly of the storage box is completed, and at the same time, the grommet 1 ensures waterproofness and dustproofness.

On the other hand, as shown in FIG. 9A, when the position to start inserting the grommet 1 is slightly displaced to the side of the protective wall 25 and the grommet 1 is erroneously assembled to the protective wall 25. As shown in FIG. 9B, during insertion, the tip of the protrusion 12 of the grommet 1 comes into contact with the tip of the protrusion 12 provided on the side wall 21A on the side of the box body 21 and moves further. Therefore, the base end of the grommet 1 is largely projected upward from the open end 21B of the box body 21,
It is possible to clearly discriminate that the erroneous attachment has been made by visual inspection, etc., and even if the upper lid is attached to the box main body 21 while the erroneous assembling is being performed, the base end of the grommet 1 is disassembled from the opening end 21A. Since the upper lid does not close due to the large protrusion upward, it can be determined that the attachment is erroneous.

The tip of the protrusion 12 provided on the grommet 1 and the tip of the protrusion 32 provided on the box body 21 are brought into contact with each other, while the recess 5 of the fitting portion 4 located at the tip on the insertion side. Since the bottom peripheral surface of the protective wall 25 and the opening peripheral edge 26 of the protective wall 25 are not in contact with each other, unnecessary damage to the bottom peripheral surface can be avoided, so that the adhesion between the concave portion 5 and the opening 22 can be ensured and the grommet 1 The sealing performance can be maintained.

As described above, according to the configuration of this other specific example, in addition to the same effect as the above specific example, the grommet 1 and the side wall 21A of the box body 21 are obtained.
By providing the protrusions 12 and 32 that come into contact with each other during the erroneous insertion of the grommet 1,
Even if the configuration of 2, 2 is changed, these protrusions 12, 3
Since the positions where the two abut each other can be set to be the same, the restrictions on the positions where the protrusions 12 and 32 are provided can be relaxed, and the degree of freedom in design can be improved.

That is, for example, by extending the downward length of the protrusion 12 of the grommet 1, the location where the protrusion 12 is provided is moved upward in the grommet 1 by the extended length. be able to. Further, by extending the upward length of the protrusion 12 of the side wall 21A, the place where the protrusion 32 is provided can be moved downward in the side wall 21A by the length of the extension.

Further, after properly assembling the grommet 1 into the opening 22, both the projections 12 and 32 are located inside the storage box 21, so that a feeling of strangeness in appearance is eliminated and these projections 12 and 32 are eliminated. It is possible to prevent unnecessary damage to the protrusions 12 and 32.

The relationship between each of the above-described specific examples and the present invention will be briefly described. The grommet 1 corresponds to the grommet of the present invention, and the protrusions 11, 12, 31, 32 correspond to the protrusions of the present invention. The side wall 21A corresponds to the fixing member of the present invention, the open end 21B corresponds to the end of the present invention,
The opening 22 corresponds to the opening of the present invention, and the protective wall 25 corresponds to the other structure of the present invention.

In each of the above specific examples, the opening 2
The example applied to the configuration in which an opening having a shape similar to the opening of the opening 22 is formed in the vicinity of the opening of No. 2 has been described, but the present invention is not limited to this, and the opening of the single opening 22 is formed. In addition, the grommet 1 itself is provided with a plurality of recesses other than the recesses 5 on the peripheral edge thereof, and the recesses other than the recesses 5 of the grommet 1 may be fitted into the opening of the opening 22. Also, the invention may be applied to an example having both of these configurations.

Further, the protective wall 25 or the grommet body 2
Although the protrusion 31 or the protrusion 11 is provided on either one of them, or the protrusion 31 and the protrusion 11 are provided on both of the protective wall 25 and the grommet body 2, the configuration may be appropriately combined. Good.

Furthermore, the single protrusion 31 is attached to the protective wall 25.
Or a single protrusion 11 on the grommet body 2,
Furthermore, the combination of the pair of protrusions 12 of the grommet body 2 and the protrusion 32 of the box body 21 is provided. However, a plurality of protrusions 31 or protrusions 11, or a combination of the protrusions 12 and the protrusions 12. A plurality of combinations of 32 may be provided, and in this case, the plurality of protrusions 31 and 11 share the pressing force required to prevent the sliding movement of the grommet 1 in the insertion direction at the time of erroneous insertion. As a result, the pressing force that each of the protrusions 31 and 11 individually bears is reduced, so that the configuration of each of the protrusions 31 and 11 can be simplified, the cost can be reduced, and a margin can be provided. The protrusions 31 and 11 prevent the grommet 1 from being erroneously inserted.
The reliability of preventing erroneous insertion of can be improved.

Even if some of the plurality of protrusions 31 and 11 or combinations of the protrusions 12 and 32 provided in a plurality of sets are damaged, at least one protrusion 31 and 11 is formed. Or, one protrusion 12 and one protrusion 3
If the combination of 2 is undamaged, erroneous assembly due to the combination of the protrusions 31 and 11 or the combination of the protrusion 12 and the protrusion 32 can be prevented. It is possible to improve the handleability of the box body 21 or the grommet body 2 provided with the plurality of protrusions 31 and 11 as described above.

Further, the grommet 1 having the insertion portion 3 for passing the wiring alone has been described, but a plurality of insertion portions 3 may be provided.

Further, the front shape of the grommet main body 2 is a shape in which one side of a rectangle is joined to a linear portion of a semicircular shape, but the present invention is not limited to this, and the opening 22 of the storage box 21 side is formed. Any shape may be used according to the shape of the opening. For example, the front shape of the grommet body 2 may have an elliptical curved portion or may have a shape corresponding to an opening shape having no linear portion.

Further, although the grommet 1 has been described as an example in which the grommet 1 is assembled to the opening 22 formed downward from the opening end 21B of the box body 21 having an upper opening, the direction of the opening 22 is oblique. Either direction or direction is acceptable.

As an example of using the grommet erroneous insertion prevention structure of this embodiment, an example of using it in a storage box which is a housing for storing electronic parts has been shown, but the invention is not limited to this.
The present invention can also be applied to boxes for accommodating wiring harnesses and other wirings as well as branch connection boxes and casings and other containers.

[0089]

As described above, according to the first aspect of the present invention, since the grommet is prevented from being inserted erroneously during the insertion, the grommet can be erroneously attached during the insertion. Since it is prevented and incorrect insertion does not occur, it is possible to improve the assurance of the assembly quality of the grommet, it is possible to achieve high reliability of waterproof and dustproof, and the workability of assembling the grommet is improved. can do.

According to the invention of claim 2, claim 1
In addition to obtaining the same effect as that of the invention described above, when the grommet is erroneously assembled, the protrusion of the fixing member prevents the grommet from continuing to move in the insertion direction during the insertion. By doing so, the base end of the grommet is largely projected upward from the end of the fixing member, and it is possible to clearly distinguish by visual inspection that the grommet has been erroneously attached. Can be securely assembled to the grommet, ensuring the quality of assembly of the grommet, and waterproofing with the grommet.
The reliability of dustproof performance can be improved.

Further, according to the invention of claim 3, in addition to the same effect as that of the invention of claim 1, a protrusion is provided on the grommet side to prevent erroneous insertion of the grommet. Since it is not necessary to change, it is possible to apply the grommet provided with the protrusion of the invention of the present invention to the fixing member having the conventional structure, and prevent the erroneous insertion of the grommet. The range of application can be expanded.

According to the invention of claim 4, claim 1
In addition to the effect similar to that of the invention described above, the projections are provided on the grommet and the fixing member so as to abut each other during the erroneous insertion of the grommet. Since the portions where the protrusions abut each other can be arbitrarily set, restrictions on the portions where the protrusions are provided are relaxed, and the degree of freedom in design can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a specific example of an erroneous insertion prevention structure for a grommet according to the present invention and showing a state before being assembled into an opening.

FIG. 2 is a top view showing the grommet of this example and the vicinity of the opening of the box body.

FIG. 3 shows a state in which the grommet of this example is assembled,
(A) is a perspective view of a state in which it is properly assembled in the opening,
(B) is a perspective view of the state improperly assembled to the protective wall.

4A and 4B are diagrams for explaining a state in which the grommet of the present example is attached to an appropriate opening, FIG. 4A is a vertical sectional view showing a state before the assembling, and FIG. 4B shows a state after the assembling. FIG.

FIG. 5 illustrates a state in which the grommet of the present example is prevented from being improperly attached to the protective wall. (A) is a longitudinal sectional view showing a state before the assembling, (b) shows the assembling. It is a longitudinal cross-sectional view showing a blocked state.

FIG. 6 shows another specific example of the erroneous insertion prevention structure for the grommet of the present invention, (a) is a longitudinal sectional view showing a state before the grommet is properly assembled to the opening, and (b) is It is a longitudinal cross-sectional view showing a state after the assembly.

7A and 7B illustrate a state in which the grommet of another example is prevented from being improperly assembled to the protective wall. FIG. 7A is a longitudinal sectional view showing a state before assembling, and FIG. FIG. 6 is a vertical cross-sectional view showing a state in which the above is blocked.

FIG. 8 shows another specific example of the grommet erroneous insertion prevention structure of the present invention, (a) is a longitudinal sectional view showing a state before the grommet is properly assembled to the opening, and (b) is It is a longitudinal cross-sectional view showing a state after the assembly.

FIG. 9 illustrates a state in which the grommet of another example is prevented from being improperly attached to the protective wall. (A) is a longitudinal sectional view showing a state before assembling, (b) is an assembling state. FIG. 6 is a vertical cross-sectional view showing a state in which the above is blocked.

FIG. 10 is a perspective view showing a grommet of a conventional example and showing a state before being assembled into an opening.

11A and 11B are views for explaining an assembled state of a grommet of a conventional example, FIG. 11A is a plan view showing a state in which the grommet is properly assembled in an opening, and FIG. 11B is an improperly assembled state in a protective wall. It is a top view which shows the attached state.

FIG. 12 illustrates an assembled state of a grommet of a conventional example, and (a) is a perspective view of a state in which the grommet is properly assembled in an opening,
(B) is a perspective view of the state improperly assembled to the protective wall.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Grommet, 2 ... Grommet main body, 4 ... Fitting part, 5 ... Recessed part, 11, 12, 31, 32 ... Projection part,
21 ... Box body, 21A ... Side wall of box body, 21B ...
Side wall end, 22 ... Opening, 25 ... Protective wall, 26
... around the opening.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4E352 AA09 BB02 BB15 CC02 CC04                       CC07 CC31 CC52 CC56 DD05                       DR03 DR13 DR33 DR34 DR46                       GG04 GG11 GG12                 5G333 AA09 AB03 AB16 CC04 DA03                       EA02                 5G361 AA06 AB12 AC02 AC04 AC11                       AE01                 5G363 AA16 BA02 CB08 DC02

Claims (4)

[Claims] 1. An opening formed at an end of the fixing member,
In the erroneous insertion prevention structure for the grommet inserted and mounted from the opening side of the opening, the grommet is erroneously inserted when the position to start inserting the grommet moves in a direction orthogonal to the opening surface of the opening. The grommet or the fixing member is provided with another structure to be mounted by either one or both of them, and at least the erroneous insertion of the grommet is prevented at least during the insertion, and either or both of the grommet and the fixing member are provided. Grommet erroneous insertion prevention structure characterized by being provided in the. 2. The erroneous insertion prevention structure for a grommet according to claim 1, wherein the prevention member is a protrusion provided on the fixing member and protruding in a path in which the grommet is erroneously inserted. 3. The erroneous insertion of the grommet according to claim 1, wherein the prevention member is a protrusion provided on the grommet and abutting against another member in the middle of a path where the grommet is erroneously inserted. Prevention structure. 4. The incorrect grommet according to claim 1, wherein the prevention member is a protrusion provided on the grommet and the fixing member and abutting each other during the incorrect insertion of the grommet. Insertion prevention structure.