JPH02293278A - Hole plug structure - Google Patents

Abstract

PURPOSE:To enable the assembling strength of a hole plug to improve even if thermosoftening resin of a relatively high melting point is used by fusingly bonding a fusible member so as to interpose a part of this fusible member between an opening edge of a platelike member and a hole plug body. CONSTITUTION:A fusible member 4 has a peripheral cylindrical part 10, a ring part 11 and a ring projection 12, and it is fitted in a hole plug body 3 from the lower side so as to cause the ring projection 12 to be held between a base 5 of this base 3 and an expanded head part 7. In this state, the body 3 is tacked to a platelike member 1 so as to interpose a part of the fusible member 4 between the edge of an opening 2 of the platelike member 1 and the body 3, and the fusible member 4 is fused and the body 3 is tightly attached to the platelike member 1, sealing an interval between both members. With this constitution, even if thermosoftening resin of a relatively high melting point is used as the fusible member 4, this member 4 goes around suitably into both sides of the platelike member 1 and a part of the opening 2. In addition, the fusible member 4 is engaged with the body 3 in advance whereby assembleability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial Application Field> The present invention relates to a hole plug structure for closing an opening provided in a plate-like member.

<Prior art> For example, in order to close an opening provided in a plate-shaped member such as an automobile body, a plunger protrudes from a base larger than the opening and a plurality of bullets are provided on the circumferential surface of the plunger. For example, U.S. Pat. No. 4,363,420 discloses a hole plug having a main body having an engaging piece and a meltable member made of a thermosoftening resin provided on a surface opposite to the surface of a plate-like member of the base. .

In such a hole plug, the main body is temporarily fixed to the plate member by first pushing the protruding part into the opening and engaging the elastic engagement piece, and then using its own adhesive force to secure the main body to the plate member. By melting the meltable member bonded to the back side and passing this member around between the protruding part and the opening edge and to the back side of the plate-like member, the hole plug body is fixed to the plate-like member and at the same time the gap between the two is fixed. I was trying to seal it.

However, in order to make the meltable member go around from one side of the plate-like member to the other side through the opening, it is necessary to use a thermoplastic resin with high fluidity (low viscosity) for the meltable member. However, such resins have a low melting point of, for example, around 60° C., so there is a problem that they are not necessarily suitable for use in automobiles and the like.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main object of the present invention is to provide a hole plug structure that improves ease of assembly and strength, and is less susceptible to temperature effects. It is about providing.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, an object of the present invention is to close the opening provided in the plate-like member by opening the opening from one side of the plate-like member. a hole plug main body having a protruding part that can be inserted into the opening protruding from a base part that covers the opening; and a hole plug body that is fixed to the opening edge of the plate-shaped member by heating and melting; The hole plug structure includes an annular meltable member made of a thermoplastic resin disposed near a fitting portion of the plunger to seal the gap between the plunger and the plunger. This is achieved by providing a hole plug structure characterized by having a portion surrounding an outer periphery and intervening between the outer periphery and the opening edge.

<Operation> In this way, the main body is temporarily fixed to the plate-like member so that a part of the meltable member is interposed between the opening edge and the hole plug main body, and the meltable member is melted to form the hole plug main body. By fixing the resin to the plate member and sealing the space between them, even if a thermoplastic resin with a relatively high melting point is used as the meltable member, it can be melted appropriately on both sides and the opening of the plate member. Possible members wrap around. Further, by engaging the meltable member in advance with the hole plug main body, ease of assembly is improved. Furthermore, since the meltable member is interposed between the protruding part and the opening edge, the degree of freedom of the hole plug body is reduced.
Eccentricity during assembly can be prevented.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show the initial shape of a hole plug structure according to the present invention. This hole plug is for closing a circular opening 2 provided in a flat member 1, which may be a body panel of an automobile, for example, and includes a main body 3,
It has a meltable member 4 that engages with the main body 3.

The main body 3 is made of 6-nylon and polyphenylene ether and has a cylindrical shape with a bottom, and includes a base 5 having a larger diameter than the opening 2, and a protruding part 6 protruding from the base 5 and having a smaller diameter than the opening 2. and an enlarged head which is provided at the free end of the plunger and whose base end side has a slightly larger diameter than the opening 2 so as to be able to resiliently engage with the opening 2, and whose diameter tapers toward the free end. 7. The end face of this enlarged head 7 is closed. Main body 3
A reinforcing cylindrical portion 8 is provided protruding from the enlarged head portion 7 to the base portion 5 at the center of the inner hole 3a. As clearly shown in FIG. 1, a rib 9 having a cross-shaped cross section is provided inside the cylindrical portion 8.

On the other hand, the meltable member 4 is made of a polyolefin resin grafted with an unsaturated carboxylic acid, and includes an outer cylindrical part 10 surrounding the base 5 of the main body 3, and an annular part 10 that abuts the surface 1a of the plate member 1 with a lower surface 11a. part 11 and this annular part 1
1, the inner peripheral surface thereof substantially coincides with the outer peripheral surface of the neck portion 6a of the protruding portion 6, and the outer peripheral surface 12a thereof has an annular shape having a diameter slightly smaller than that of the opening 2. It has a protrusion 12. This meltable member 4 is fitted into the main body 3'' from the lower side in FIG.
The fusible member 4 is held in the main body 3 by holding the annular protrusion between the base 5 and the enlarged head 7 so that the annular protrusion 2 surrounds the annular protrusion. The outer circumferential surface of the outer cylindrical portion 10 of the meltable member 4 has a tapered shape that gradually increases in diameter from its free end side, that is, from the upper side in FIG. However, this is because when the outer circumferential cylindrical portion 10 is melted, it spreads suitably to the outside without penetrating into the inside, increasing the adhesive force.

In order to close the opening 2 of the plate-like member 1 with such a hole plug, first press the upper surface 8a of the cylindrical part 8 of the hole plug from the upper side in FIG. 2, that is, from the surface 1a side of the plate-like member. The plunger 6 is thrust into the opening 2 and engaged with the enlarged head 7. At this time, the annular protrusion 12 of the fusible member 4 is interposed between the neck 6a of the plunger 6 and the opening 2, and the degree of freedom of the hole plug relative to the plate member 1 after engagement is relatively small. Therefore, the plug is preferably held at the center of the opening 2 without being eccentric. Furthermore, since the fusible member 4 is resiliently engaged with the hole plug main body 3 in advance, the fusible member 4 does not come off from the main body 3 during hole plug assembly, improving workability. There is.

Next, the meltable member 4 is melted by heating the assembly portion, that is, the vicinity of the opening 2 (for example, at 155° C.), the main body 3 is fixed to the plate-like member 1, and the space between the two is sealed (the first Figure 3). At this time, the annular protrusion 12 of the meltable member 4 melts and appropriately wraps around the lower surface 1b of the plate-like member 1, so that even if the meltable member 4 is made of a thermoplastic resin having a relatively high melting point, The gap between the opening 2 and the neck 6a of the plunger 6 can be reliably sealed, and the main body 3 can be fixed to the plate member 1.

The hole plug fixed to the plate member 1 in this manner can ensure sufficient assembly strength without causing the meltable member 4 to soften even at a relatively high temperature of, for example, about 100°C. This does not affect the closed state of the opening 2. Further, by providing the cylindrical portion 8 at the center of the inner hole 3a of the main body 3, it is reinforced against the force from the back side 1b side of the plate-like member 1 of the main body 3, that is, from the lower side in FIG. , it becomes difficult for the hole plug to separate from the opening 2.

In this embodiment, the enlarged head 7 of the main body 3 has a circular cross section, but if it has a polygonal cross section such as a hexagonal or octagonal cross section, the tolerance of the opening 2 or the main body 3 can be reduced. It can be made large. Further, in this example, a polyolefin resin grafted with an unsaturated carboxylic acid was used for the meltable member, but it goes without saying that the resin is not limited to this, and various thermoplastic resins can be used depending on the usage conditions. do not have.

[Effects of the Invention] As described above, according to the present invention, the meltable member is temporarily fixed to the plate member such that a part of the meltable member is interposed between the opening edge and the hole plug main body, and the meltable member is By melting and bonding the hole plug body to the plate-shaped member, even if a thermoplastic resin with a relatively high melting point is used as the meltable member, it can be melted appropriately on the front and back surfaces of the plate-shaped member and the opening. Since the movable member rotates, the assembly strength of the hole plug is improved and it is less susceptible to temperature effects. Further, by engaging the meltable member in advance with the hole plug main body, ease of assembly is improved. Furthermore, since the meltable member is interposed between the protruding portion and the opening edge, the degree of freedom of the hole plug body is reduced, and eccentricity during assembly can be prevented. From the above, the effects of the present invention are extremely large.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a hole plug according to the present invention. FIG. 2 is a side sectional view taken along line 1-1 in FIG. 1. FIG. 3 is a side cross-sectional view showing a hole plug according to the present invention assembled into an opening of a plate-like member. 1...Flat member 1a...Surface 1b...Back surface 2...Opening 3...Body 3
a... Inner hole 4... Meltable member 5... Base 6
...Plunging part 7...Enlarged head 8...Cylindrical part 9...Rib 10...Outer cylindrical part 11
...Annular portion 11a...Bottom surface 12...Annular protrusion 12a...Outer peripheral surface

Claims (3)

[Claims] (1) In order to close an opening provided in a plate-shaped member, a hole plug main body has a protrusion part that can be inserted into the opening protruded from one side of the plate-shaped member at a base that covers the opening. , a heat-softening material disposed near the fitting portion of the protruding portion in order to fix the main body to the opening edge of the plate-like member by heating and melting and sealing the gap between the two; A hole plug structure including an annular meltable member made of resin, the meltable member having a portion surrounding the outer periphery of the protruding portion and intervening between the outer periphery and the opening edge. A hole plug structure characterized by: (2) The hole plug structure according to claim 1, wherein the free end of the plunger portion is provided with an enlarged head that elastically engages with the opening. (3) The hole plug structure according to claim 2, wherein the portion of the meltable member is held between the enlarged head and the base of the main body.