Plastic part mounting structure

Abstract

To simplify a mounting work without causing a resin component to rattle after being attached to its mating member.SOLUTION: A mounting structure of a drain component 5, configured to insert and mount the drain component 5 into a mounting hole 1c provided in a lower frame 1 from the upper surface side of the lower frame 1, in which the drain component 5 has an insertion portion 6a that is inserted into the mounting hole 1c of the lower frame 1 and a head 6b that is placed on the upper surface of the lower frame 1 while covering the mounting hole 1c; the outer circumference of the insertion portion 6a has a locking portion 9a, 9b, 9c and a press-fit portion 8 protruding respectively, and when the head 6b is placed on the upper surface of the lower frame 1, the locking portion 9a is brought close to and faces the lower surface of the lower frame 1 and the press-fit portion 8 is pressed against the inner circumference of the mounting hole 1c.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mounting structure for a resin part, in which the resin part is inserted into a mounting hole provided in a workpiece, such as a shaped member, from the surface side of the workpiece. [Background technology]

[0002] Some fittings have drainage parts that control the discharge of water such as condensation water that accumulates on the upper surface of the lower frame. The drainage parts are attached by being inserted from above into mounting holes provided in the upper wall of the lower frame, and have an insertion part that is inserted into the mounting hole and a large-diameter head that is arranged to cover the mounting hole. Inside this drainage part, a drainage passage is provided so as to penetrate the upper wall of the lower frame from top to bottom, and a valve body is provided in the drainage passage to prevent fluid from passing from below to above. According to fittings equipped with the above drainage parts, water that accumulates on the upper surface of the lower frame is discharged downward through the drainage passage of the drainage part. On the other hand, when the wind and rain are strong outside, the valve body closes the drainage passage, so that it is possible to prevent the outside air and water from entering the room through the drainage passage (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-30382 Summary of the Invention [Problem to be solved by the invention]

[0004] The drainage component has an insertion portion provided with a protruding locking portion. This locking portion prevents the drainage component from falling off the lower frame upper wall portion by sandwiching the lower frame upper wall portion between the head and the locking portion. That is, the locking portion allows the insertion portion to be inserted into the mounting hole by elastically deforming when the drainage component is attached to the lower frame upper wall portion, and is positioned to face the lower surface of the lower frame upper wall portion when the head abuts against the upper surface of the lower frame upper wall portion, thereby restricting upward movement of the drainage component.

[0005] In order to make the locking portion face the underside of the upper wall of the lower frame, it is preferable to set the distance between the head and the locking portion to a dimension larger than the plate thickness of the upper wall of the lower frame. In other words, if the dimension between the outer surface and the locking portion is made to match the plate thickness of the upper wall of the lower frame, the work of making the locking portion face the back surface of the upper wall of the lower frame becomes complicated. In particular, when multiple locking portions are provided, the head needs to be positioned in a state where it is in contact with the upper surface of the upper wall of the lower frame around its entire circumference without any gaps, which may make the installation work of the resin part extremely complicated.

[0006] However, if the distance between the head and the locking part is set to be greater than the thickness of the upper wall of the lower frame to facilitate the installation work, a gap will be created between the lower surface of the upper wall of the lower frame and the locking part even after the plastic part is installed. This allows the plastic part to move relative to the upper wall of the lower frame by the amount of the gap, which can cause problems such as rattling. Note that the above-mentioned problem is not limited to when a drainage part is installed on the lower frame, but can occur in the same way when a plastic part is installed in a mounting hole of a mounting material.

[0007] In view of the above-mentioned circumstances, the present invention has an object to provide a mounting structure for a resin part that can facilitate mounting work without causing the resin part to rattle after being mounted on a workpiece. [Means for solving the problem]

[0008] In order to achieve the above object, the mounting structure for a resin part according to the present invention is a mounting structure for a resin part in which a resin part is inserted into a mounting hole provided in a workpiece constituting a fixture from the front side of the workpiece to be mounted, the resin part having an insertion portion which is inserted into the mounting hole of the workpiece and a head portion which is placed on the front side of the workpiece to cover the mounting hole, the insertion portion having an outer surface which is provided with a locking portion and a press-fitting portion which protrude from each other, the locking portion facing the back side of the workpiece when the head portion is placed on the front side of the workpiece, and the press-fitting portion being pressed against the inner wall surface of the mounting hole. and extends beyond the back surface of the workpiece. It is characterized by the above. Effect of the Invention

[0009] According to the present invention, since the insertion portion is provided with an engagement portion and a press-fit portion, even if the distance between the head and the engagement portion is set large to facilitate installation work, it is possible to prevent rattling by the press-fit portion being pressed against the inner wall surface of the mounting hole. [Brief description of the drawings]

[0010] [Figure 1] 1 is a partially enlarged longitudinal sectional view of a main portion of a fitting to which a mounting structure for a resin part according to a first embodiment of the present invention is applied. [Diagram 2] This shows a drainage part attached as a resin part to the fitting in Figure 1, where (a) is a cross-sectional view of the valve body opening the opening of the fluid passage, and (b) is a cross-sectional view of the valve body closing the opening of the fluid passage. [Diagram 3] 3 is an external perspective view showing a main part of the drainage part shown in FIG. 2. [Figure 4] 3 shows the main part of the drainage part shown in FIG. 2, where (a) is a side view and (b) is a conceptual diagram seen from below. [Diagram 5] 10 is a longitudinal sectional view showing, in enlarged form, a main part of a fitting to which a mounting structure for a resin part according to a second embodiment of the present invention is applied. FIG. [Figure 6] FIG. 6 is an external perspective view showing a main part of a drainage part attached as a resin part to the fixture in FIG. 5. [Figure 7]7 shows the main part of the drainage part shown in FIG. 6, where (a) is a side view and (b) is a conceptual diagram seen from below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a mounting structure for a resin part according to the present invention will be described in detail with reference to the accompanying drawings.

[0012] (Embodiment 1) FIG. 1 shows the main part of a fixture to which the mounting structure of a resin part according to the first embodiment of the present invention is applied. The fixture exemplified here is called a fixed window (fixed window) configured by holding a surface material on a frame body. The lower frame (attached material) 1 constituting the frame body is an extruded shape formed from a metal such as an aluminum alloy, and is configured so that the entire length along the longitudinal direction has almost the same cross-sectional shape. In the first embodiment, the lower frame 1 is exemplified, which has a storage recess 1a that opens upward and an upper wall portion 1b that is provided so as to cover a part of the room side portion of the storage recess 1a, and supports the surface material 2 in a state in which the lower edge portion of the surface material 2 is accommodated in the storage recess 1a. In the illustrated example, a setting block 3 is disposed between the lower end surface of the surface material 2 and the lower frame 1. In addition, a seal material 4 is disposed between the surface of the surface material 2 and the lower frame 1. Furthermore, although not shown in the figure, a drain hole is provided in an appropriate position on the bottom wall portion of the storage recess 1a to discharge water inside the storage recess 1a to the outside.

[0013] A mounting hole 1c is provided in the upper wall 1b at a portion disposed so as to cover the accommodation recess 1a, and a drainage part (resin part) 5 is disposed in the mounting hole 1c. Although not shown in the figure, the mounting hole 1c is circular and penetrates the upper wall 1b from top to bottom. The drainage part 5 functions to drain water such as condensation water accumulated on the upper surface (surface of the mounting material) of the upper wall 1b to the accommodation recess 1a, while restricting the flow of water from the accommodation recess 1a to the upper surface side of the upper wall 1b. In the present embodiment 1, as shown in FIG. 2, a drainage part 5 is illustrated which includes a main body case 6 and a valve body 7 disposed movably relative to the main body case 6, and is intended to be attached to a plurality of types of lower frames 1 having different plate thicknesses. More specifically, the lower frame 1 shown in FIG. 1 has the smallest plate thickness among the objects to be attached. The drainage part 5 of the embodiment 1 is configured so as to be attached to two types of lower frames 1 having a plate thickness greater than that of the lower frame 1 of FIG. 1.

[0014] As shown in Figs. 1 to 3, the main body case 6 is formed by integrally molding the insertion portion 6a, the head portion 6b, and the neck portion 6c with resin. The insertion portion 6a is a columnar shape with a circular cross section having an outer diameter that allows it to be inserted into the mounting hole 1c. In the illustrated example, the lower end portion is tapered so that the outer diameter gradually decreases downward, and a notch 6d for accommodating the valve body 7 described below is provided on the peripheral surface of the lower end portion. The head portion 6b is a columnar shape with a diameter larger than the inner diameter of the mounting hole 1c, and is provided at the upper end portion of the insertion portion 6a with their axes aligned. The neck portion 6c is a columnar shape with a circular cross section provided between the insertion portion 6a and the head portion 6b, and is configured to have an even smaller diameter than the insertion portion 6a. The dimension of this neck portion 6c along the axial direction is set to be smaller than the plate thickness dimension of the upper wall portion 1b. Inside the main body case 6, a fluid passage 6e is provided. The fluid passage 6e opens at the lower end of the insertion portion 6a and at two locations on the circumferential surface of the head portion 6b.

[0015] The valve body 7 has a support shaft portion 7a at its upper end and a lid portion 7b at its lower end that can close the opening of the fluid passage 6e, and is disposed inside the insertion portion 6a via the notch 6d. The valve body 7 is disposed in the main body case 6 in a state in which the support shaft portion 7a is disposed in a bearing long hole 6f provided at the lower end of the insertion portion 6a, so that the valve body 7 can rotate around the axis of the support shaft portion 7a and can move up and down relative to the insertion portion 6a.

[0016] In the drainage component 5 having the above configuration, in a normal state, the support shaft portion 7a is maintained in a state in which it is disposed at the lower end of the long bearing hole 6f by the weight of the valve body 7 as shown in FIG. 2(a). In this state, the lower end opening of the fluid passage 6e is in a state of being open. Furthermore, when water accumulates on the upper surface of the lid portion 7b, the valve body 7 rotates counterclockwise in the figure, and the drainage of the water can be promoted. On the other hand, when the support shaft portion 7a moves to the upper end of the long bearing hole 6f against the gravity of the valve body 7, the lower end opening of the fluid passage 6e is closed by the lid portion 7b as shown in FIG. 2(b), and the flow of water through the fluid passage 6e is prevented.

[0017] As shown in Figs. 3 and 4, the insertion portion 6a of the main body case 6 is provided with a press-fit portion 8 and locking portions 9A, 9B, and 9C protruding from the outer circumferential surface (outer surface).

[0018] The press-fitting portion 8 is a small-width protrusion extending from the upper end position, which is the boundary between the insertion portion 6a and the neck portion 6c, along the axis of the insertion portion 6a. In the present embodiment 1, the press-fitting portion 8 is provided at two positions symmetrical to each other about the axis in the circumferential direction of the insertion portion 6a. In other words, the two press-fitting portions 8 are provided at positions shifted from each other by 180° along the circumferential direction of the insertion portion 6a. Each press-fitting portion 8 has a constant protrusion amount from the outer peripheral surface of the insertion portion 6a at the upper end, and is tapered so that the protrusion amount gradually decreases downward at the lower end. The dimension from the outer peripheral surface of one press-fitting portion 8 to the outer peripheral surface of the other press-fitting portion 8 is set to be slightly larger than the inner diameter of the mounting hole 1c.

[0019] The locking portions 9A, 9B, and 9C are small-width protrusions extending along the axis of the insertion portion 6a, similar to the press-fit portion 8. In the illustrated example, the locking portions 9A, 9B, and 9C are tapered so that the protruding amount of the upper end is constant and the protruding amount of the lower end gradually decreases downward, similar to the press-fit portion 8. In the first embodiment, the insertion portion 6a is provided with three types of locking portions 9A, 9B, and 9C, two of which have different distances from the upper end surface to the lower surface of the head 6b. Of these, the locking portion closest to the head 6b (hereinafter, referred to as the upper locking portion 9A when distinguishing between them) is set so that the distance from the upper end surface to the lower surface of the head 6b is slightly larger than the plate thickness of the upper wall portion 1b, and a gap is formed between the lower surface of the head 6b and the upper end surface when the lower surface of the head 6b is abutted against the upper surface of the upper wall portion 1b. Similarly, the locking portion next closest to head 6b (hereinafter referred to as middle locking portion 9B when distinguishing) has a distance from its upper end face to the bottom surface of head 6b that is slightly greater than the upper wall portion of the lower frame 1 having an intermediate plate thickness to which it is attached, and the locking portion furthest from head 6b (hereinafter referred to as lower locking portion 9C when distinguishing) has a distance from its upper end face to the bottom surface of head 6b that is slightly greater than the upper wall portion of the lower frame 1 having the greatest plate thickness to which it is attached. These three types of locking portions 9A, 9B, 9C are provided at equal intervals between the press-fit portions 8 when viewed from the lower end side of insertion portion 6a, in the order of upper locking portion 9A, middle locking portion 9B, and lower locking portion 9C in a clockwise direction. In other words, the press-fit portion 8, the upper locking portion 9A, the middle locking portion 9B, and the lower locking portion 9C are provided in this order on the outer circumferential surface of the insertion portion 6a at positions shifted from one another by 45° in the circumferential direction. The paired locking portions 9A, 9B, and 9C are disposed at positions shifted from one another by 180°, similar to the press-fit portion 8. The dimension from the outer circumferential surface of one upper locking portion 9A to the outer circumferential surface of the other upper locking portion 9A, the dimension from the outer circumferential surface of one middle locking portion 9B to the outer circumferential surface of the other middle locking portion 9B, and the dimension from the outer circumferential surface of one lower locking portion 9C to the outer circumferential surface of the other lower locking portion 9C are each approximately the same as the press-fit portion 8.

[0020] The drainage part 5 configured as described above is attached to the lower frame 1 by inserting the insertion part 6a into the mounting hole 1c from the upper surface of the upper wall part 1b and abutting the lower surface of the head part 6b on the upper surface of the upper wall part 1b. As a result, condensation water accumulated on the upper surface of the upper wall part 1b is drained through the fluid passage 6e of the drainage part 5 to the accommodation recess 1a, and further to the outside of the room through the drain hole (not shown).

[0021] Here, in the drainage part 5 attached to the upper wall 1b, the two press-fitting parts 8 provided on the insertion part 6a are pressed against the inner circumferential surface (inner wall surface) of the attachment hole 1c. Therefore, even if wind and rain from the outside blow into the accommodation recess 1a through the drainage hole (not shown), the main body case 6 remains attached to the upper wall 1b without rattling, and the valve body 7 reliably closes the fluid passage 6e, making it possible to prevent the outside air and water from entering the room. Moreover, when the lower surface of the head 6b abuts against the upper surface of the upper wall 1b, all the locking parts 9A, 9B, and 9C provided on the insertion part 6a penetrate the upper wall 1b, and the upper end surface of the upper locking part 9A is in close contact with the lower surface (rear surface) of the upper wall 1b and faces it. As a result, even if the press-fit portion 8 hardens due to aging and the mounting strength to the upper wall portion 1b decreases, there is no concern that the upper locking portion 9A will come into contact with the back surface of the upper wall portion 1b, causing the drainage part 5 to be pulled out of the lower frame 1. Furthermore, a dimension larger than the plate thickness of the upper wall portion 1b is secured between the upper end surface of the upper locking portion 9A and the lower surface of the head portion 6b. Therefore, by simply inserting the drainage part 5 into the mounting hole 1c, the upper end surface of the upper locking portion 9A is reliably positioned facing the back surface of the upper wall portion 1b, and there is no risk of the installation work of the drainage part 5 becoming complicated.

[0022] In addition, in the above-mentioned drainage part 5, since multiple types of locking parts 9A, 9B, and 9C having different distances from the head 6b are provided, the press-in part 8 can be pressed against the inner circumferential surface of the mounting hole 1c even for the lower frame 1 having a large plate thickness, and the upper end faces of the middle locking part 9B and the lower locking part 9C can be made to face the back surface of the upper wall part 1b of the lower frame 1 having a large plate thickness in close proximity. Therefore, the number of parts to be handled can be reduced by sharing the drainage part 5, and the manufacturing cost of the fittings that share it can be reduced. Moreover, for example, when the upper end face of the middle locking part 9B faces the back surface of the upper wall part 1b, the upper locking part 9A is pressed against the inner circumferential surface of the mounting hole 1c together with the press-in part 8, which has the effect of increasing the mounting strength.

[0023] (Embodiment 2) 5 shows the main parts of a fixture to which the mounting structure for resin parts according to the second embodiment of the present invention is applied. The fixture illustrated here is a fixed window (fixed window) similar to that of the first embodiment, and differs only in the detailed configuration of the drainage part (resin part) 15 mounted on the sill (receiving material) 1. Below, configurations that differ from the first embodiment will be explained, and similar configurations will be denoted by the same reference numerals and explanations thereof will be omitted.

[0024] In other words, the drainage part 15 applied in the fitting of embodiment 2 is intended to be attached to a sill 1 having a single predetermined plate thickness, and has a press-fit portion 8 and one type of locking portion 9 in the insertion portion 6a of the main body case 16.

[0025] The press-fit portion 8 is a small-width protrusion extending from the upper end position that is the boundary between the insertion portion 6a and the neck portion 6c along the axis of the insertion portion 6a. However, in the portion overlapping the opening of the fluid passage 6e, the upper end surface of the press-fit portion 8 is lower by the amount of the fluid passage 6e. In the second embodiment, three press-fit portions 8 are provided at positions spaced apart from each other along the circumferential direction of the insertion portion 6a. The condition for providing the three press-fit portions 8 is that any two of them are not positioned 180° apart from each other. In the illustrated example, the three press-fit portions 8 are not arranged at positions that are equally spaced from each other along the circumferential direction of the insertion portion 6a, but they may be equally spaced. However, if they are arranged at equal intervals, the number of press-fit portions 8 must be an odd number of three or more. The press-fit portions 8 have a constant amount of protrusion from the outer peripheral surface (outer surface) of the insertion portion 6a at the upper end, and are tapered so that the amount of protrusion gradually decreases downward at the lower end, as in the first embodiment.

[0026] The locking portion 9 is set so that the distance from the upper end surface to the underside of the head 6b is slightly larger than the plate thickness of the upper wall portion 1b, and a gap is formed between the underside of the head 6b and the upper end surface when the underside of the head 6b is abutted against the upper surface of the upper wall portion 1b. In the illustrated example, one locking portion 9 is provided at each position between the press-fit portions 8 along the circumferential direction of the insertion portion 6a. The locking portions 9 are disposed so as to be shifted from each other by 180° with respect to the press-fit portions 8. The locking portions 9 have a constant amount of protrusion from the outer circumferential surface of the insertion portion 6a at the upper end, and are tapered so that the amount of protrusion gradually decreases downward at the lower end, as in the first embodiment.

[0027] The drainage part 15 configured as described above is attached to the lower frame 1 by inserting the insertion part 6a into the mounting hole 1c from the upper surface of the upper wall part 1b and abutting the lower surface of the head part 6b on the upper surface of the upper wall part 1b. As a result, condensation water accumulated on the upper surface of the upper wall part 1b is drained through the fluid passage 6e of the drainage part 15 to the accommodation recess 1a, and further to the outside of the room through the drainage hole (not shown).

[0028] Here, in the drainage part 15 attached to the upper wall 1b, the three press-fitting parts 8 provided on the insertion part 6a are pressed against the inner circumferential surface of the attachment hole 1c. Therefore, even if wind and rain from the outside blow into the accommodation recess 1a through the drainage hole (not shown), the body case 16 remains attached to the upper wall 1b without rattling, and the valve body 7 reliably closes the fluid passage 6e, making it possible to prevent the outside air and water from entering the room. Moreover, when the lower surface of the head 6b abuts against the upper surface of the upper wall 1b, all the locking parts 9 provided on the insertion part 6a penetrate the upper wall 1b, and the upper end surfaces of the locking parts 9 are in close contact with and face the lower surface (rear surface) of the upper wall 1b. As a result, even if the press-in portion 8 hardens due to aging and the mounting strength to the upper wall portion 1b decreases, there is no concern that the drainage part 15 will be pulled out of the lower frame 1 because the locking portion 9 abuts against the back surface of the upper wall portion 1b. Furthermore, a dimension larger than the plate thickness of the upper wall portion 1b is secured between the upper end surface of the locking portion 9 and the lower surface of the head portion 6b. Therefore, by simply inserting the drainage part 15 into the mounting hole 1c, the upper end surface of the locking portion 9 is reliably positioned facing the back surface of the upper wall portion 1b, and there is no risk of the installation work of the drainage part 15 becoming complicated.

[0029] In addition, the press-fitting portions 8 are provided at positions that are not shifted by 180° from each other, and the locking portions 9 are also provided at positions that are not shifted by 180° from each other. Therefore, the operating force required to insert the insertion portion 6a into the mounting hole 1c of the upper wall portion 1b can be reduced, and the workability when mounting the drainage part 15 can be improved.

[0030] In the second embodiment described above, the locking portions 9 are also provided at positions that are not shifted by 180° from each other, but the present invention is not limited to this.

[0031] In the above-mentioned first and second embodiments, the drainage parts 5 and 15 are exemplified as the resin parts, but as long as they have the insertion part 6a and the head 6b, they are not necessarily limited to the drainage parts 5 and 15. Furthermore, although the insertion part and the mounting hole are exemplified as having a circular cross section, they can also be applied to parts having other cross sections. In this case, the insertion part and the head do not need to have the same cross section. Furthermore, the upper wall part 1b of the lower frame 1 is exemplified as the mounting material, but it may be a frame body other than the lower frame 1 or a frame that constitutes a shoji screen, and it is also applicable to the case where a resin part is mounted to a mounting material other than a building fixture. In this case, the resin part may be mounted not only on the upper surface of the mounting material, but also on the side or lower surface. Furthermore, the mounting material does not need to be plate-shaped. For example, it is also applicable to the case where a resin cap (resin part) is attached to the end surface of a cylindrical building material. In this case, the back surface of the mounting material may be formed by forming a recess on the inner wall surface of the mounting hole, for example.

[0032] Furthermore, in the above-mentioned first and second embodiments, the press-fit portion 8 and the locking portion 9, 9A, 9B, and 9C are provided in multiple numbers, but at least one press-fit portion 8 and one locking portion 9, 9A, 9B, and 9C are sufficient. When multiple types of locking portions are provided on the insertion portion 6a, three types are provided in the above-mentioned first embodiment, but three types are not necessarily required as long as there are two or more locking portions. In addition, the press-fit portion 8 and the multiple types of locking portions 9A, 9B, and 9C do not necessarily need to be equally spaced.

[0033] Furthermore, in the above-mentioned first and second embodiments, the press-fit portion 8 and the locking portions 9, 9A, 9B, and 9C are illustrated as small-width protrusions extending along the axial direction of the insertion portion 6a, but the shapes of the press-fit portion and the locking portions are not limited to these. Also, although the lower ends of the press-fit portion 8 and the locking portions 9, 9A, 9B, and 9C are tapered, they do not have to be tapered.

[0034] As described above, the mounting structure for a resin part according to the present invention is a mounting structure for a resin part in which a resin part is inserted into a mounting hole provided in a workpiece from the surface side of the workpiece to be mounted, and the resin part has an insertion portion which is inserted into the mounting hole of the workpiece, and a head which is placed on the surface of the workpiece so as to cover the mounting hole, and a locking portion and a press-in portion are each provided so as to protrude from the outer surface of the insertion portion, and when the head is placed on the surface of the workpiece, the locking portion faces the back side of the workpiece and the press-in portion is pressed against the inner wall surface of the mounting hole. According to this invention, since the insertion portion is provided with an engagement portion and a press-fit portion, even if the distance between the head and the engagement portion is set large to facilitate installation work, it is possible to prevent rattling by the press-fit portion being pressed against the inner wall surface of the installation hole.

[0035] Furthermore, the present invention is characterized in that in the above-mentioned resin part mounting structure, a plurality of types of the locking portions are provided on the outer surface of the insertion portion, the locking portions being at mutually different distances from the head portion. According to this invention, the resin part can be standardized for multiple types of workpieces with different plate thicknesses, which is advantageous in terms of parts management and manufacturing costs. Moreover, among the multiple locking parts, the one arranged in the mounting hole of the workpiece functions as a press-in part, thereby increasing the attachment strength of the resin part to the workpiece.

[0036] Furthermore, the present invention is characterized in that, in the mounting structure for the resin part described above, the insertion portion is configured to have a circular cross-sectional shape, and the press-fit portion and the multiple types of locking portions are repeatedly provided in the insertion portion along the circumferential direction in a preset order. According to this invention, the locking portion which functions to face the back surface of the workpiece is not biased in the circumferential direction of the insertion portion, making the insertion operation easier.

[0037] Furthermore, in the above-described resin part mounting structure according to the present invention, the press-fit portion and the plurality of types of locking portions are provided at positions that are equally spaced apart in a circumferential direction of the insertion portion. According to this invention, the distance between the press-in portion and the locking portion, and the distance between the locking portions are equal along the circumferential direction of the insertion portion, which provides advantages in terms of manufacturing operations, such as good moldability when molding a plastic part, e.g., the part can be released evenly in the circumferential direction.

[0038] Furthermore, the present invention is characterized in that, in the mounting structure for a resin part described above, the insertion portion is configured to have a circular cross-section, and a plurality of press-fit portions are provided on the outer surface of the insertion portion along the circumferential direction of the insertion portion, and the plurality of press-fit portions are arranged so as to avoid positions that are 180° apart from each other. According to this invention, the force required for insertion into the mounting hole can be reduced compared to when the press-fit portions are positioned at 180° to each other, which is advantageous in terms of workability.

[0039] The present invention is also characterized in that, in the above-mentioned mounting structure for a resin part, the outer surface of the insertion portion is provided with the locking portion at a position between the press-fit portions along the circumferential direction. According to this invention, since the locking portions are disposed between the press-fit portions, the locking portions and the press-fit portions are disposed alternately in the circumferential direction of the insertion portion.

[0040] Furthermore, the present invention is characterized in that, in the mounting structure for the resin part described above, the tip portion which becomes the insertion side in the press-in portion and the tip portion which becomes the insertion side in the locking portion are formed in a tapered shape so that the amount of protrusion from the outer surface of the insertion portion gradually decreases toward the tip. According to this invention, the tip portions on the insertion side of the press-in portion and the locking portion are formed in a tapered shape, which facilitates the operation of inserting the insertion portion into the mounting hole. [Explanation of symbols]

[0041] 1 lower frame, 1c mounting hole, 5, 15 drainage parts, 6a insertion part, 6b head, 8 press-fit part, 9, 9A, 9B, 9C locking parts

Claims

1. A mounting structure for a resin part in which a resin part is inserted into a mounting hole provided in a mounting material constituting a fixture from a front side of the mounting material, the resin part has an insertion portion that is inserted into a mounting hole of the workpiece, and a head portion that is placed on a surface of the workpiece in a state where it covers the mounting hole, A locking portion and a press-fitting portion are provided on an outer surface of the insertion portion so as to protrude from each other, A mounting structure for a resin part, characterized in that when the head is placed on the surface of the workpiece, the engaging portion faces the back surface of the workpiece, and the press-in portion is pressed against the inner wall surface of the mounting hole and extends beyond the back surface of the workpiece.

2. 2. The resin part mounting structure according to claim 1, wherein a plurality of types of the locking portions are provided on an outer surface of the insertion portion, the locking portions being spaced apart from one another by a distance from the head portion.

3. The insertion portion is configured to have a circular cross-sectional shape, 3. The resin part mounting structure according to claim 2, wherein the press-fitting portion and the plurality of types of locking portions are repeatedly provided in the insertion portion in a preset order along a circumferential direction.

4. The resin part mounting structure according to claim 3 , wherein the press-fit portion and the plurality of types of locking portions are provided at equidistant positions along a circumferential direction of the insertion portion.

5. The insertion portion is configured to have a circular cross-sectional shape, A plurality of the press-fitting portions are provided on an outer surface of the insertion portion along a circumferential direction of the insertion portion, 2. The resin part mounting structure according to claim 1, wherein the press-fitting portions are arranged so as to avoid positions at which they are mutually spaced 180 degrees apart.

6. 2. The resin part mounting structure according to claim 1, wherein the locking portions are provided on an outer surface of the insertion portion at positions between the press-fit portions along a circumferential direction.

7. The mounting structure for a resin part according to claim 1, characterized in that the tip portion that forms the insertion side of the press-in portion and the tip portion that forms the insertion side of the locking portion are formed tapered so that the amount of protrusion from the outer surface of the insertion portion gradually decreases toward the tip.

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