JPH0653813U - Seal nut - Google Patents

Abstract

(57) [Summary] [Purpose] The seal nut has a function to prevent the screwed male screw from returning. [Structure] The seal member 20 is provided in one end of the nut body 10.
Fit in. The seal member 20 includes a cylindrical portion 21 and a thin plate-shaped sealing portion 22 provided inside the cylindrical portion 21. Female thread 1
The threaded portion of the male screw screwed into 3 bites into the inner peripheral surface of the cylindrical portion 21 to prevent the male screw from returning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal nut used as, for example, a weld nut.

[0002]

[Prior art]

 Weld nuts are used in large quantities in automobiles, for example. In that case, the weld nut is often welded to the vehicle body before painting and the male screw is often screwed in after painting. Therefore, the adhesion of the paint to the female thread becomes a problem. Therefore, a so-called seal nut has been developed in which the inlet of the screw hole is closed by a thin plate-shaped seal member.

The seal member used here prevents the paint from entering the female screw portion and prevents the screw hole and the screw portion from being filled with the paint. Moreover, since it is easily removed when the male screw is screwed, it does not hinder the screwing. However, it can be obtained only by a complicated method such as injecting resin into the screw hole, which significantly increases the cost of the nut.

The present invention provides an inexpensive and functional seal nut in which the seal member is easily attached by mechanical pushing and the seal member also functions as a detent member for the male screw screwed into the female screw portion. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 The seal nut according to the present invention is provided with a screw hole into which a male screw penetrates in the shaft center portion, a female screw portion is formed on the peripheral surface excluding one end of the screw hole, and the one end peripheral surface is continuous in the circumferential direction. A nut main body provided with a groove-shaped holding portion, and a cylindrical portion is fitted into the holding portion by being pushed into a threaded hole of the nut main body from one end side, and the inner diameter of the cylindrical portion is set to the mountain of the female portion. It is characterized in that it has a resin-made seal member having a thin plate-like sealing portion that is made substantially equal to the inner diameter of the portion and is broken by the intrusion of a male screw inside the cylindrical portion.

[0006]

[Action]

 The cylindrical portion of the seal member provides the seal member with the size and rigidity required for mechanical indentation. Since the inner diameter is almost equal to the inner diameter of the threaded portion of the female threaded portion of the nut body, the threaded portion of the male thread screwed into the female threaded portion bites into the inner peripheral surface of the cylindrical portion and functions as a detent member for the male screw.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a vertical perspective view of a seal nut showing an embodiment of the present invention, and FIG. 2 is a vertical perspective view of a seal member used in the seal nut.

The present seal nut is composed of a metallic nut body 10 and a resin seal member 20 mounted in the tip portion thereof.

The nut body 10 is a prismatic weld nut, and has projections 11 for welding at four corners of the base end surface. A screw hole 12 is provided in the axial center of the nut body 10. The peripheral surface of the screw hole 12 is a female screw portion 13 except for the tip. The peripheral surface of the tip portion of the screw hole 12 has an inner diameter larger than the inner diameter of the valley portion of the female screw portion 13 so as not to hinder the screwing in of the male screw, and the peripheral surface thereof has a concave groove shape continuous in the circumferential direction. A holding part 14 is provided.

The seal member 20 has a cylindrical portion 21 fitted and held in the holding portion 14 of the nut body 10. The outer peripheral surface of the cylindrical portion 21 is pressed against the holding portion 14 so as not to move in the circumferential direction. The inner diameter of the cylindrical portion 21 is the same as or slightly smaller than the inner diameter of the crest portion of the female screw portion 13. A thin plate-shaped sealing portion 22 is provided at the center of the cylindrical portion 21 in the axial direction. The sealing portion 22 is provided integrally with the cylindrical portion 21 and crosses the inside of the cylindrical portion 21 in a direction perpendicular to the axis to close the same.

The seal member 20 is inserted into the inside of the holding portion 14 by mechanical pushing from the tip side of the nut body 10. The thickness of the sealing portion 22 of the sealing member 20 is, for example, about 0.5 mm so that the sealing member 22 can be easily broken at the tip of the male screw. As the material of the seal member 20, heat-resistant nylon or the like that withstands welding heat is used.

The present seal nut is mounted on the body of an automobile or the like by resistance welding the nut body 10. At the time of resistance welding, the nut body 10 is heated and the heat is transmitted to the seal member 20. Although the heat effect on the seal member 20 is large on both end surfaces of the cylindrical portion 21, the seal portion 22 which is relatively weak to heat in the seal member 20 is located at the axial center portion apart from both end surfaces of the cylindrical portion 21. Therefore, it is possible to effectively avoid the heat effect during welding. Further, when the sealing portion 22 is located at the central portion in the axial direction of the cylindrical portion 21, the directionality of the seal member 20 disappears, which is convenient in terms of work efficiency when the seal member 20 is pushed. .

When a vehicle body or the like having a seal nut attached thereto is painted, the seal nut is coated with paint, but since the tip end of the screw hole 12 of the nut body 10 is blocked by the seal member 20, the seal member 20 is deeper than the seal member 20. The paint does not penetrate into it. Therefore, the paint is prevented from adhering to the female screw portion 13.

When the male screw is screwed in, the screw portion of the male screw advances into the cylindrical portion 21 while biting into the inner peripheral surface of the cylindrical portion 21. At this time, the sealing portion 22 is broken at the tip of the male screw. By further continuing the screwing, the screw portion is screwed into the female screw portion 13. Since the threaded portion of the male screw that has been screwed deeply cuts into the cylindrical portion 21, there is no risk of inadvertent loosening.

Although the above embodiment is a weld nut, the present invention is not limited to this, and can be applied to various nuts such as a normal nut. The outer shape of the nut is not limited to a quadrangle, but may be a hexagon or the like. The sealing portion 22 of the sealing member 20 can be located at the axial end of the cylindrical portion 21, and further, a radial V groove or the like is provided to facilitate breakage, or the thickness can be gradually changed to change the thickness of the male screw. It is also possible to have a structure that prevents the cylindrical portion 21 from being detached when screwed.

[0016]

[Effect of device]

 As described above, since the seal nut according to the present invention seals one end of the screw hole of the nut body with the seal member, even if the female nut is painted before the male screw is screwed into the paint, To prevent the external threads from sticking and to ensure the smooth threading of the male screw. Moreover, since the seal member prevents the screwed male screw from returning and is easily attached to the nut body by mechanical pushing, the manufacturing cost of the seal nut can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional perspective view of a seal nut according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional perspective view of a seal member used for a seal nut.

[Explanation of symbols]

 10 Nut Main Body 12 Screw Hole 13 Female Threaded Part 14 Holding Part 20 Sealing Member 21 Cylindrical Part 22 Sealing Part

Claims (2)

[Scope of utility model registration request] 1. A screw hole into which a male screw penetrates is provided in an axial center portion, a female screw portion is formed on a peripheral surface excluding one end portion of the screw hole, and a groove-shaped continuous groove is formed on the peripheral surface of the one end portion. A nut body provided with a holding portion, and a cylindrical portion is fitted into the holding portion by being pushed into a screw hole of the nut body from one end side, and an inner diameter of the cylindrical portion is substantially equal to an inner diameter of a mountain portion of the female screw portion. In addition, a seal nut made of resin, which is provided with a thin plate-shaped sealing portion that breaks due to the intrusion of a male screw inside the cylindrical portion. 2. The sealing portion of the sealing member is provided at the axial center of the cylindrical portion.
Seal nut described in.