JPH0422101Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a washered nut used for fixing other members to weld bolts welded to the floor panel of an automobile.

(Conventional technology) Various parts are fixed to the floor panels of automobiles using weld bolts, but after welding the weld bolts, a thick coating of vinyl chloride sol or other paint for rust prevention is applied to the floor panel. Therefore, if you try to attach parts using a normal disc spring-shaped washer and nut, the paint on the bolt surface will prevent the nut from being screwed in, and the vinyl chloride sol will accumulate on the underside of the washer, causing the washer to lose its elasticity. The problem was that the anti-loosening effect was reduced.
Therefore, the present applicant first devised a nut that facilitated screwing in by providing a vertical groove on the inner peripheral surface of the nut to scrape off the vinyl chloride sol adhering to the bolt surface. However, when this nut is used, a large amount of vinyl chloride sol, which is peeled off from the bolt surface as the nut is screwed, accumulates inside the washer.
There was another drawback that made the above drawbacks even more significant.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional problems and improves the elasticity of the washer even when tightening nuts against weld bolts etc. that have paint on them. This was completed with the aim of creating a nut with a washer that would not be lost and would hardly cause any decrease in axial force.

(Means for solving the problem) The present invention has a vertical groove for removing paint on the inner circumferential surface extending from the seat surface to the upper end surface, and a gentle notch on the periphery of the nut body. The present invention is characterized in that a washer in the form of a disc spring is rotatably attached to form a communication path for discharging the peeling paint consisting of a vertical groove and a notch.

(Embodiment) Next, the present invention will be described with reference to the illustrated embodiment. In FIG. 1, 1 is a nut body, and 2 is a disc spring-shaped washer rotatably caulked to a protrusion 3 on the lower surface of the nut body. Vertical grooves 5 for removing paint with sharp edges 4 in the screwing direction are recessed in several places on the inner peripheral surface of the nut body 1 from the seat surface to the upper end surface. 1
The structure is such that when the bolt is screwed in, the paint adhering to the bolt surface can be peeled off and discharged downward through the inside of the vertical groove 5. In addition, a disc spring-shaped washer 2
On the periphery, gentle notches 6 are formed at equal intervals from
Approximately four recesses are provided in the vertical groove 5 of the nut body 1 and the notch in the disc spring-shaped washer 2 so that the paint discharged downward through the vertical groove 5 is discharged to the outside through the notch 6. A communication path for discharging the peeling paint is formed. Further, the shape of the notch 6 is not particularly limited, but in order to prevent stress concentration in the central part, (outer diameter/number of notches) x
It is preferable to add a radius of about (0.3 to 0.6) mm. Furthermore, if the notch 6 has a small depth, the paint discharging effect described later will not be obtained, so it is preferable that the depth is about half the width between the outer peripheral edge 7 of the washer 2 and the center hole 8 as shown in the figure. .

(Function) The device configured as described above is used for fixing the object 12 to be fastened to the weld bolt 11 welded to the substrate 10 as shown in FIG. Since a part of the applied paint 13 such as vinyl chloride sol is also attached to the surface of the weld bolt 11, the nut body 1 is scraped off by the vertical grooves 5 on the inner peripheral surface of the nut body 1. Screwing is done. As shown in the figure, when the lower surface of the washer 2 comes into contact with the upper surface of the object 12, the washer 2 stops rotating and the object 1 is tightened.
Only the paint on the weld bolt 11 is scraped off by the vertical groove 5 of the nut body 1 without scraping off the paint on the upper surface of the nut body 1. Then, the scraped paint is discharged to the outside through a communication path for discharging the peeling paint, which is made up of the vertical groove 5 of the nut body 1 and the notch 6 of the washer 2 shaped like a disc spring. The paint does not accumulate inside the washer 2 as in the case of using the disc spring washer 2, and the washer 2 is less likely to set and loosen. Moreover, since the elastic modulus of the washer 2 is reduced by providing the notch 6, even if the washer 2 is weakened by paint after tightening, the decrease in the axial force will be minimal.

For example, the initial axial force of the nut with the washer of the present invention and the nut with the conventional disc spring washer is 200 kg.
When screwing into a weld bolt coated with vinyl chloride sol and measuring the residual axial force after one hour, the conventional product was 150 kg and the initial residual axial force ratio was 75%, but In the case of the present invention using a washer with a notch 6 recessed therein, the residual axial force was 170 kg, and the residual ratio reached 85%.

(Effects of the invention) As is clear from the above explanation, the present invention allows for easy screwing into bolts with paint on them, and also consists of vertical grooves in the nut body and cutouts in the washer. By discharging the peeled paint to the outside through the communication path for discharging the peeled paint, it is possible to prevent the elastic force of the washer from decreasing and maintain the axial force at a high level. Since it is rotatably mounted, the washer will not scrape off the paint on the surface to be tightened. Therefore, according to the present invention, the decrease in the axial force of the bolt can be kept to a minimum, an excellent locking effect can be obtained, and the surface to be tightened is not damaged. Therefore, the present invention has extremely great practical value as a nut with a washer that eliminates the problems of the conventional one.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, and FIG. 2 is a partial sectional view showing its usage. 1... Nut body, 2... Washer, 5... Vertical groove, 6... Notch.

Claims (1)

[Scope of utility model registration request] A washer 2 in the shape of a disc spring is provided on the lower surface of the nut body 1, which has a vertical groove 5 for removing paint on the inner peripheral surface extending from the seat surface to the upper end surface. Rotatably installed with vertical groove 5 and notch 6
A nut with a washer, characterized in that a communication path for discharging peeling paint is formed.