JPH0673417U - Round hole screw grommet - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a screw grommet for a round hole that can effectively prevent co-rotation of the body part and can effectively absorb the positional deviation between the insertion hole and the through hole of the mating panel. A screw hole grommet having a body 2 having a round cross section, and an insertion hole for a screw member 6 being formed in the body 2, wherein a screw member is inserted into the center of the body. By providing a guide protrusion 4 for guiding the guide ring and forming an annular insertion hole 5 around the guide protrusion,
The displacement of the insertion hole itself from the center of the body can prevent co-rotation of the body when the screw member is screwed into the insertion hole, and, for example, the round body from any direction in the panel P1. Even when fitted into the mounting round hole H1, the action of the annular shape of the insertion hole can effectively absorb the deviation of the through hole H2 of the mating panel P2 that overlaps with the insertion hole. With the guide action of the guide protrusion, the screw member can be inserted from the through hole of the mating panel into the corresponding hole portion of the annular insertion hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a round hole screw grommet for polymerizing and fixing two panels, for example.

[0002]

[Prior art]

 Conventional screw grommets of this kind differ in structure in detail, but generally, there are two types of screw grommets, one for square holes and one for round holes, depending on the shape of the mounting hole formed on the panel side. It is used. The square hole grommet has a body portion formed into a rectangular cross section similar to the panel mounting square hole, and the square body portion is fitted into the panel mounting square hole. When a screw member is screwed into the body, the body part rarely rotates together, but on the other hand, the grommet for round holes has a round cross-section similar to the mounting round hole of the panel. Due to this, if a screw member is screwed into the insertion hole of the body, this round body will easily rotate together, and it may not be possible to obtain a reliable overlapping and fixing state of the panels. Had. This also applies to the case where the polymerization fixing state of the panel is released.

Moreover, when the mounting hole is formed on the panel side, if the mounting hole is a square hole, it must be punched out, but if the mounting hole is a round hole, Since it can be easily drilled with a simple tool such as a drill, when fixing optional parts or service parts of the car to the vehicle body panel later, make a round mounting hole in the panel. There are many cases of using screw grommets for round holes. Therefore, in this field, the appearance of a grommet for a round hole capable of preventing co-rotation is desired.

Therefore, as a screw grommet for a round hole capable of preventing such co-rotation, an improved screw grommet disclosed in, for example, Japanese Patent Laid-Open No. 50-97764 and Japanese Utility Model Laid-Open No. 61-36720 is provided. ing. Although these improved screw grommets are not specifically shown, basically, the insertion hole formed in the round body from the flange is not formed in the center of the body, but from the center. It is configured to prevent co-rotation of the grommet body by forming it with an offset.

[0005]

[Problems to be solved by the device]

 Certainly, under the improved screw grommet, by screwing the screw member into the eccentric insertion hole, in particular, the body wall surface near the insertion hole and the body wall surface facing this wall surface are attached. Since it spreads to the edge of the round hole and bites into it firmly, it is possible to effectively prevent co-rotation of the body, but this time, the following problems are introduced. That is, even in the conventional grommet in which the insertion hole is formed in the center of the body part, hole alignment becomes a problem, but especially when the insertion hole is deviated from the center, the body part is attached to the panel mounting circle. Since the position of the insertion hole is different each time depending on the direction in which the insertion hole is inserted, the positional relationship between the insertion hole and the through hole of the mating panel to be overlapped with each other is very likely to be displaced. Therefore, this time, due to this misalignment, it becomes difficult or difficult to insert the screw member into the insertion hole, and eventually it becomes difficult to obtain a reliable overlapping fixed state between the panels. Will have.

[0006]

[Means for Solving the Problems]

 The present invention was developed in order to effectively solve the problem of the conventional improved screw grommet, and has a body with a round cross section, and an insertion hole for a screw member is provided in the round body. A structure in which a guide projection for guiding the insertion of a screw member is provided in the center of the round body, and a circular insertion hole is formed around the guide projection, on the premise of the formed round hole screw grommet. It was adopted.

[0007]

[Action]

 Therefore, according to the present invention, when the insertion hole is formed in the shape of a ring, the insertion hole is formed around the guide protrusion provided at the center of the body. Since the insertion hole itself is deviated from the center of the body, this prevents co-rotation of the body when the screw member is screwed into the insertion hole. However, no matter how the round body is inserted into the mounting round hole of the panel from any direction, the annular shape of the insertion hole causes the displacement of the through hole of the mating panel that overlaps with the insertion hole. Since it can be effectively absorbed, it becomes possible to insert the screw member smoothly from the through hole of the mating panel into the corresponding hole portion of the annular insertion hole by obtaining the guide action of the guide protrusion.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment. The screw grommet for a round hole according to the embodiment is also an integrally molded product of synthetic resin, and its basic structure is shown in FIGS. As described above, the disk-shaped flange portion 1 and the body portion 2 having a round cross section are provided, and the insertion hole for the screw member is formed from the flange portion 1 to the inside of the body portion 2, and a plurality of temporary holes are formed on the outer peripheral surface of the body portion 2. The stopper shoulder 3 is provided in a protruding manner. The feature is that a pillar-shaped guide protrusion 4 for guiding insertion of a screw member is provided at the center of the body 2 as shown in the figure. An annular insertion hole 5 is formed all around the guide protrusion 4. Therefore, under the present embodiment, the insertion hole 5 itself is deviated from the center of the body portion 2, but because the insertion hole 5 is formed in an annular shape, the insertion range of the screw member is It is possible to dramatically expand.

Therefore, when this screw grommet is used, the round body 2 is fitted into the mounting round hole H1 of the one panel P1 and then the other upper surface of the flange 1 is inserted into the mounting round hole H1. If the panel P2 is stacked and placed, the guide of the guide projection 4 is obtained from the through hole H2 of the other panel P2, and the screw member 6 is screwed into the insertion hole 5 of the body 2, The diameter of the body portion 2 is expanded outward, and as shown in FIG. 3, the two panels P1 and P2 are reliably overlapped and fixed to each other. Further, in the screwing operation of the screw member 6, even under the present embodiment, the insertion hole 5 itself is displaced from the center of the body portion 2, so that the screwing portion of the screw member 6 is screwed. Since the body wall surface in the vicinity and the body wall surface opposite to this wall firmly bite into the edge of the mounting round hole H1, co-rotation of the body 2 can be effectively prevented.

Moreover, in this embodiment, for example, the insertion direction of the body portion 2 into the mounting round hole H1 of one panel P1 becomes different, and the insertion hole 5 and the other panel P2 are connected. Even if the positional relationship of the hole H2 deviates, it is possible to effectively absorb the deviation due to the action obtained from the annular shape of the insertion hole 5. Therefore, under the present embodiment, even if the displacement due to the displacement of the insertion hole 5 occurs, the guide action of the guide protrusion 4 is obtained, and the screw member 6 is inserted into the other hole of the panel P2. Since it can be screwed into the corresponding hole portion of the annular insertion hole 5 from H2, it is possible to always ensure a reliable superposition of the panels P1 and P2.

[0011]

[Effect of device]

 As described above, according to the present invention, by adopting the above-mentioned configuration, it is possible to prevent co-rotation of the body due to the displacement of the insertion hole from the center of the body, and to insert the screw member into the insertion hole. By expanding the range, even if there is a deviation in the positional relationship between the insertion hole and the through hole of the mating panel, the misalignment is effectively absorbed and the screw member is annular from the through hole of the mating panel. Since it becomes possible to smoothly screw into the corresponding holes of the insertion holes, it is possible to always ensure a reliable overlapping and fixing state of the panels. Therefore, the round hole screw grommet of the present invention is not limited to this, but in particular, it uses a mounting round hole that is drilled later with a tool such as a drill for optional parts and service parts of the automobile. Therefore, when fixing it to the body panel side, it is the most suitable one.

[Brief description of drawings]

FIG. 1 is a sectional view showing a screw grommet for a round hole according to an embodiment of the present invention.

FIG. 2 is a plan view of the screw grommet.

FIG. 3 is a cross-sectional view of an essential part showing a state in which two panels are superposed and fixed to each other.

[Explanation of symbols]

 2 Round body 4 Guide protrusion 5 Annular insertion hole 6 Screw member P1 One panel H1 Same mounting round hole P2 Other panel H2 Same through hole

Claims (1)

[Scope of utility model registration request] 1. A screw grommet for a round hole, comprising a body having a round cross section, and an insertion hole for a screw member being formed in the round body, wherein a screw member is inserted into the center of the round body. A round hole screw grommet, characterized in that a guide projection for guiding the guide hole is provided, and an annular insertion hole is formed around the guide projection.