JPH0613366Y2 - Mounting boss structure for synthetic resin parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a mounting boss structure for a synthetic resin part, and more particularly to a mounting boss structure capable of preventing surface distortion after molding.

[Conventional technology]

In FIG. 4, the synthetic resin component 10 _a includes a substrate portion 12,
It has a mounting boss 14 standing upright from the board portion 12. The hole 16 extends along the center line of the mounting boss 14 and opens at the top surface of the mounting boss 14. The coupling member 18 coupled to the synthetic resin parts 10 _a are devoted to the top surface of the mounting boss 14, mounting screws 20 while cutting the screw into the hole 16 from being inserted into the insertion hole of the coupling member 18 threadedly Then, the member to be coupled 18 is tightened and fixed to the mounting boss 14. In such a mounting boss structure, when the height of the mounting boss 14 is high, it is necessary to increase the thickness of the root portion of the mounting boss 14 in order to secure the strength of the mounting boss 14. Further, when the height of the mounting boss 14 becomes higher, the wall thickness becomes thicker at the root portion due to the inclination of die cutting from the outer periphery of the top surface. In that case, after the molding of the synthetic resin parts 10 _a, on the side opposite to the mounting boss 14, surface strain on the surface of the base plate 12
Liable 22 is generated, which is to reduce the surface quality of the rigid resin parts 10 _a.

Therefore, in the conventional measures for preventing the occurrence of such surface strain 22, as shown in the synthetic resin part _10b in FIGS. 5 and 6, the cylindrical base 24 having a predetermined height or less is It is formed so as to rise from the substrate portion 12. Also, peace 26
Is a screw hole 28 that extends along the center line thereof and penetrates the piece 26, and a press-fitting portion 30 that is press-fitted and fixed to the inner periphery of the tubular base portion 24.
And have.

[Problems to be solved by the invention]

However, in the measures of Figure 5 and Figure 6, the piece 26 separately fabricated from the synthetic resin parts 10 _b, and it is necessary to assemble the pieces 26 to the synthetic resin parts 10 _b, high manufacturing cost Has become.

The purpose of this invention is that it can be integrally molded,
An object of the present invention is to provide a mounting boss structure for a synthetic resin component, which is capable of preventing the occurrence of surface strain on the surface of the substrate portion opposite to the mounting boss and improving the surface quality.

[Means for solving problems]

The mounting boss structure for synthetic resin parts according to the present invention is connected to the cylindrical height portion which rises from the base plate portion and which is opened laterally on the inner surface side on one side surface portion and the top portion of this cylindrical height portion. It has a boss portion protruding from the top portion in the longitudinal direction of the cylindrical height portion and having a hole formed in the center.

[Action]

The member to be coupled is applied to the top surface of the boss portion, and the mounting screw is inserted into the insertion hole of the member to be coupled and then screwed into the hole of the boss portion. As a result, the coupled member is fastened to the top surface of the boss portion by the mounting screw and fixed to the boss portion.

〔Example〕

The invention will be described below with reference to the embodiment shown in FIGS.

The synthetic resin part _10c is an integrally molded product of synthetic resin and has a substrate portion 12 as a main body. Cylindrical height 32
Connects the base portion to the substrate portion 12 and
From one side to the other side (rightward in FIG. 1) by molding at the time of molding to a predetermined height.
The inner space 34 of 32 is opened laterally. The end surface 36 is formed on the top surface of the cylindrical height portion 32, and the boss portion 38 is joined to the end surface 36 at the base end and rises from the end surface 36 in the longitudinal direction of the cylindrical height portion 32 along the center line. A through hole 40 is formed. The boss portion 38 has a height that ensures proper screwing of the mounting screw 20 (Fig. 4). The through hole 40 is threaded after the synthetic resin part _10c is molded, or is threaded when the mounting screw 20 is screwed.

Thus, as in the case of FIG. 4, the member 18 to be joined is applied to the top surface of the boss portion 38, the mounting screw 20 is inserted into the insertion hole of the member 18 to be joined, and then screwed into the through hole 40. The member to be coupled 18 is fixed to the boss portion 38 by tightening the mounting screw 20.

It is not necessary to form a screw hole in the cylindrical height portion 32,
Since it only serves to obtain the height from 12 to the top surface of the boss portion 38, the inner space 34 is formed inside the cylindrical height portion 32, and the cylindrical height portion 32 with the substrate portion 12 is formed. The thickness of the cylindrical height portion 32 at the joining portion of the
It is possible to prevent the occurrence of surface strain on the surface of the substrate portion 12 on the side opposite to.

[Effect of device]

As described above, according to the present invention, in order to secure the distance from the substrate portion to the top surface of the boss portion, the cylindrical height portion is interposed between the substrate portion and the boss portion, and the cylindrical height No threaded hole is formed in the portion, and the cylindrical height portion only needs to have strength corresponding to the height, and the inner surface is open laterally on one side surface. Therefore, since the cylindrical height portion can have a small thickness even at the joint portion with the substrate portion, it is possible to avoid the occurrence of surface strain after molding on the surface of the substrate portion opposite to the mounting boss. Therefore, the surface quality of the rigid resin component can be improved. Further, since the inner surface side of the cylindrical height portion is opened in the lateral direction, the cylindrical height portion needs to have a slope on the outer surface side for die cutting from the outer periphery of the top surface of the cylindrical height portion. It is possible to avoid an increase in the thickness of the root portion of the profile height portion.

[Brief description of drawings]

1 to 3 relate to an embodiment of a mounting boss structure for synthetic resin parts according to the present invention. FIG. 1 is a side view and a second view.
The figure is a view from the direction II in FIG. 1, FIG. 3 is a perspective view, and FIG.
The figure is a side view of a conventional example of a mounting boss structure for synthetic resin parts,
5 and 6 are a longitudinal sectional view and a perspective view of another conventional example of manufacturing a mounting boss for a synthetic resin part. 10c ... Synthetic resin parts, 12 ... Board part, 32 ...
Cylindrical height part, 38 ... Boss part, 40 ... Through hole (hole).

Claims (1)

[Scope of utility model registration request] 1. A tubular height portion, which rises from the base plate portion, is opened laterally on the inner surface side at one side surface portion, and is joined to the top portion of the tubular height portion, and the tubular height is provided from the top portion. A boss structure for mounting a synthetic resin part, which has a boss part that is formed in the center and protrudes in the vertical direction.