JPH0732969Y2 - Screw grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a screw / grommet for mounting a mounting member such as a component to a mounted member.

<< Prior Art >> This type of screw grommet generally includes a head, legs protruding from the lower surface of the head, and screw holes provided in the head and the legs.

Then, after inserting the leg portion into the hole of the mounted member, the mounting member is placed on the head and the screw with a head is screwed into the screw hole from the through hole of the mounting member to expand the diameter of the leg portion. Is engaged with the hole of the member to be mounted, and is fixed to the member to be mounted in a state where the mounting member is sandwiched between the head and the head of the screw.

The specific configuration of the leg portion is a bottomed cylindrical type that emphasizes water-tightness as exemplified in Japanese Utility Model Publication No. 62-22659, and is divided into a plurality as exemplified in Japanese Utility Model Publication No. 58-24646. It is roughly classified into the following types, and further variously modified or improved according to the application.

<Problems to be solved by the invention> By the way, such a screw / grommet has a structure in which the screw is screwed into the leg to expand the diameter of the leg and engage the hole of the member to be mounted. It is easy to rotate with the receiving hole. This co-rotation is likely to occur particularly when the hole of the mounted member is round, and often occurs immediately after the screwing of the screw is started, which may cause improper fixing.

In addition, the split type leg structure is difficult to maintain watertightness along the screwed portion of the screw, and water may leak from the mounting member side to the back side of the mounted member through the screwed portion of the screw. .

The present invention has been made as a measure against the above problems. A screw that can prevent co-rotation when screwing in a screw and can impart watertightness even to a type with split legs
Intended to provide grommets.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention provides a head, a leg protruding from a lower surface of the head, and a screw provided from the head to the leg. A mounting hole, the leg portion is inserted into the hole of the mounted member, and a screw with a head is screwed into the screw hole from the through hole of the mounting member to expand the diameter of the leg portion and to mount the mounting member. In a screw / grommet that fixes a member to the mounted member while sandwiching the member between the head and the head of the screw, an encircling wall having a screw hole as a center is projected on the upper surface of the head, and the encircling wall It is characterized in that the adhesive is accommodated in a state where the upper portion protrudes inside.

<< Operation >> According to the above configuration, when the screw is screwed in, the head of the screw / grommet is joined to the mounting member by the adhesive in the surrounding wall provided at the predetermined position. Even if is added to the screw grommet, co-rotation is blocked.

In addition, since the adhesive is inherently highly viscous or flexible, a part of the adhesive is caught in the screw during the screwing process of the screw, and it functions as a screw locking stopper, and the leg parts Watertightness can be imparted even with a structure.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of a screw grommet to which the present invention is applied, and FIGS. 2 (a) to (e) show respective surfaces and sectional views of the grommet.

The screw grommet 1 shown in the figure is made of a synthetic resin molded body in which a leg portion 3 of a two-division type is provided on the lower surface of a head portion 2, and a screw hole 4 is provided from the head portion 2 to the leg portion 3. 3 is inserted into the through hole h1 of the mounted member P1 and the screw S such as a tapping screw is screwed into the screw hole 4 from the through hole h2 of the mounting member P2, inside the surrounding wall 5 provided on the head 2. The structure is such that the adhesive 6 is installed in advance.

The head 2 is a round flat plate, and has a surrounding wall 5 which is provided on the head and is erected on the peripheral portion. The surrounding wall 5 is provided with the screw hole 4 as the center, and the protruding size and the like are determined according to the adhesive 6 used.

In other words, the size of the surrounding wall 5 is set so that at least the upper portion of the adhesive 6 can be accommodated in a protruding state and the diameter is larger than that of the adhesive 6. Therefore, although the surrounding wall 5 is provided in a donut shape, it may be configured by dividing the donut shape into a plurality of pieces.

The leg part 3 is divided into two parts from the lower part of the head part 2 to the rear end part by a slit 7a, and an engaging part 9 is provided in the head part 2 from each half leg part 8. The engagement portion 9 is integrated with the half leg portion 8 on the lower side by two slits 7b extending from a predetermined position on the rear end portion of the half leg portion 8 to the inside of the head portion 2, and Separated from the head 2. The outer surface shape of each engaging portion 9 is
After the taper is enlarged from the vicinity of the head portion 2, the taper is reduced from the middle of the length to the portion integrated with the half leg portion 8, and the taper enlarged portion is the hole h1 of the mounted member P1. Strongly crimp-engage with the edge portion (not limited to the through hole, but may be a hollow hole). The outer main portion of each engaging portion is a half leg portion 8.
Is cut out so as to have a diameter substantially equal to the outer surface diameter, and the tapered enlarged portion is formed only on both sides of the cutout portion 8a.

The screw hole 4 has a hole diameter and the like determined in accordance with the selected screw S, and is generally provided so that the diameter gradually decreases from the head 2 to the rear end of the leg 3.

FIG. 3 shows the usage state of the grommet, and the operation will be described below with reference to FIG.

The screw / grommet 1 of the present invention is a member to be attached.
It is used to fix the mounting member P2 to P1,
Specifically, it is also used in the construction field such as fixing plates and mounting parts of motors, radiators, regulators, luggage racks, etc. to panels and walls of automobiles, air conditioners, refrigerators, etc., such as fixing window frames. . Therefore, the specific fixing work procedure is not uniform, and only the essential parts will be described here.

FIG. 9A shows a state before the mounting member P2 is set on the mounted member P1 and fixed by the screw S.

Here, the maximum point different from the conventional one is that the adhesive 6 is installed inside the surrounding wall 5 provided on the head 2.
The adhesive 6 is accommodated in a state where the upper portion thereof protrudes from the surrounding wall 5 and a gap H is formed between the adhesive 6 and the surrounding wall 5. Further, the adhesive 6 used here is made of butyl rubber having excellent adhesiveness, is pressed into a round shape of a predetermined size, and has a hole 6a smaller than the screw S formed at the center thereof. It is a thing. Then, as shown in FIG. 1, after the release paper A such as a silicon sheet is attached to the upper surface of the adhesive 6, the release paper A is placed in the surrounding wall 5 on the head 2 with the release paper A facing up. The release paper A is peeled off from the adhesive 6, and the mounting member P2 is positioned and set on the adhesive 6.

The release paper A is provided with a hole A1 communicating with the hole 6a, and the adhesive 6 can be installed at a predetermined position in the surrounding wall 5 by utilizing the hole A1 and the hole 6a. Of course, the release paper A is not essential. Further, in the figure, reference numeral 10 is a seal member, which prevents water from entering the hole h1 of the mounted member P1 from the outer peripheral portion or the like of the head 2. Such a seal member 10 may be integrally formed by two-color molding or the like.

In the above state, the lower surface of the mounting member P2 installed on the adhesive 6 is joined to the upper protruding portion of the adhesive 6, and the mounting member P2
This is where it is temporarily fixed to the head 2 of the screw grommet 1.

Next, as shown in FIG.
Through the through hole h2, and screwed into the screw hole 4 through the hole 6a of the adhesive 6. The screw S is screwed into the head S1 while being fitted with a driver or the like, but in a factory or the like, it is generally performed using a high-speed dedicated tool.

As the screw S is screwed in, the screw 4a that meshes with the screw thread S2 of the screw S is formed on the inner wall of the screw hole 4, and the diameter of each half leg portion 8 and the engaging portion 9 is expanded in the radial direction. The leg portion 3 is fixedly engaged with the hole h1 of the mounted member P1, and finally the mounting member P2 is fixed to the mounted member P1 while being pressed by the head S1 of the screw S. In this fixed state, the adhesive 6 is pressed by the mounting member P2 and crushed so as to spread to some extent to the periphery, and the shape is maintained by hitting the inner surface of the peripheral wall 5.
In addition, when the adhesive 6 is set to be relatively thin, the adhesive 6 may be crushed and substantially match the upper end of the peripheral wall 6, but in such a case, the mounting member P2 is Hit the wall 5 and always keep it in parallel.

And, what is important here is that the conventional screw / grommet receives the torque due to the screwing of the screw S
Although it is easy to rotate together with h1, in the present invention, since the mounting member P2 is temporarily fixed to the screw grommet 1 as described above, the screw grommet 1 is prevented from rotating together. This co-rotation prevention is effectively exhibited regardless of the size of the mounting member P2, and although some superiority or inferiority is recognized depending on the type of the adhesive 6, it is remarkable for the one not using the adhesive. It was confirmed that

Therefore, the present invention not only improves the screwing workability particularly when the hole h1 is set to a round shape, but also can greatly reduce the fixing defect rate due to co-rotation.

Further, since the adhesive 6 is rich in self-viscosity or flexibility, a part of the adhesive 6 is wound around the screw thread S2 during the screwing process of the screw S and is attached while being drawn between the screws 4a meshing with the screw thread S2. To be done.

Then, in the case of the leg portion 3 which is divided into two by the slit 7a as in the embodiment, the adhesive portion 6b of the adhesive 6 in which the space between the screws 4a meshing with the screw thread S2 is wound is sealed to obtain watertightness. It was found by the water tightness test. Further, the adhesion portion 6b of the adhesive 6 also functions as a loosening stopper for the screw thread S2.

It should be noted that the present invention excludes the surrounding wall 5 provided on the upper surface of the head 2 with the screw hole 4 being substantially at the center, and the adhesive 6 installed in the surrounding wall 5 with the upper portion protruding. For example, the head 2 may be formed in a rectangular plate shape, or the leg structure may be replaced with another known one, so that various modifications can be made.

<Effect of device> As described above, in the screw / grommet of the present invention, it is possible to prevent co-rotation that is likely to occur when screwing in the screw, and thus when the hole of the mounted member is set to be round. The workability of screwing in can be improved, and the fixing defect rate can be reduced.

Further, in the present invention, since the adhesive has a high self-viscosity or flexibility, a part of the adhesive is caught in the screw during the screwing process of the screw to prevent the screwed part of the screw from being loosened, and the split type In the case of the leg structure, water tightness can be imparted by the wound adhesive.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a screw grommet shown as an embodiment of the present invention, FIGS. 2 (a) to (e) are views showing respective surfaces and cross sections of the grommet, and FIG. 3 (a), ( B)
[Fig. 3] is a cross-sectional view showing a usage state of the grommet. 1 …… Screw grommet 2 …… Head 3 …… Legs 4 …… Screw hole 5 …… Enclosure wall 6 …… Adhesive P1 …… Mounted member h1 …… Mounted member hole P2 …… Mounting Member h2 …… Mounting member through hole S …… Screw (Tapping screw)

Claims (1)

[Scope of utility model registration request] 1. A head portion, a leg portion protruding from a lower surface of the head portion, and a screw hole provided from the head portion to the leg portion, the leg portion being a hole of a member to be attached. By inserting the headed screw into the screw hole from the through hole of the mounting member to expand the diameter of the leg portion and sandwich the mounting member between the head and the head of the screw. In a screw / grommet fixed to a mounting member, an enclosure wall having a screw hole substantially at the center thereof is projected on the upper surface of the head, and an adhesive is stored in the enclosure wall with an upper portion protruding. A screw grommet characterized by