JPH076513U - screw - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the paint is attached to the screw hole for tightening the screw or the screw itself, the screw can be tightened or loosened while removing the paint. [Structure] First and second cutout grooves 5 and 6 extending in the axial direction are formed at the tip of the shaft portion 2, and rotation of the bolt 1 in the tightening direction is performed on both circumferential edges of the first cutout groove 5. A rear side edge of the second notch groove 6 is formed on the cutting blade 5a, and a rear side edge of the second cutout groove 6 with respect to the rotation in the loosening direction of the bolt 1 is formed. 6a. When the bolt 1 is tightened in the screw hole to which the paint adheres, the cutting blade 5a of the first notch groove 5 peels off the paint on the inner surface of the screw hole.
On the contrary, when the bolt 1 to which the paint is attached is loosened so as to be removed from the screw hole, the cutting blade 6a of the second notch groove 6 separates the paint attached to the bolt 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw with a paint peeling function suitable for use when fixing another member to a member to be painted.

[0002]

[Prior art]

 For example, when a component is fixed to a car body after painting by a screw, the paint adheres to a screw hole during painting, which makes it difficult to tighten the screw. In order to solve this problem, conventionally, a cutting blade is formed on the screw so that the paint adhering to the screw hole can be peeled off by this cutting blade.

[0003]

[Problems to be solved by the device]

 As described above, in the conventional screw having the paint peeling function, the peeling function is effective only for the rotation in the tightening direction. However, some parts are attached with screws before painting the main body. In this case, the paint adheres to the screw during the coating process, and therefore when the screw is loosened to remove the part for replacement or the like, the paint adhering to the screw itself cannot be peeled off and is difficult to loosen.

Therefore, an object of the present invention is to provide a screw that can be tightened and loosened while peeling the paint regardless of whether the paint is attached to the screw hole or the screw itself.

[0005]

[Means for Solving the Problems]

 The screw of the present invention has at least one notch groove extending in the axial direction at the tip of the shaft portion, and one of the two circumferential edges of the notch groove which is the rear side with respect to the rotation in the screw tightening direction. The edge is formed on the cutting blade, and the side edge which is the rear side with respect to the rotation in the loosening direction of the screw is formed on the cutting blade.

[0006]

[Action]

 When the screw is tightened in the screw hole where the paint adheres, one cutting blade scrapes off the paint on the inner surface of the screw hole by the rotation in the tightening direction, so the screw can be tightened easily. On the contrary, when the screw to which the paint adheres is loosened to be removed from the screw hole, the other cutting blade peels the paint adhered to the screw by the rotation in the loosening direction, so that the screw can be loosened easily.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, a hexagonal head 3 is provided at one end of a shaft portion 2 of a bolt 1 as a screw, and a male screw 4 is formed at a tip end side portion of the shaft portion 2. The front half of the formation area of the male screw 4 is formed in a taper shape whose diameter decreases toward the front, and the depth of the groove of the male screw 4 becomes gradually shallower toward the front in this tapered portion. Is configured to be. The male screw 4 is configured to be a right-hand screw, that is, the rotation in the direction indicated by arrow A in FIG. 2 is the tightening direction, and the rotation in the direction indicated by arrow B is the loosening direction.

A first notch groove 5 and a second notch groove 6 extending in the axial direction are formed on both sides of the tip portion of the shaft portion 2. As shown in FIGS. 3 and 4, these notch grooves 5 and 6 are formed in a substantially V-shape so as to widen from the middle of the equal-diameter portion of the forming region of the male screw 4 toward the tip. . Regarding the first notch groove 5, as shown in FIG. 3, among the both side edges in the circumferential direction, the side edge that is the rear side with respect to the rotation in the direction of the arrow A, which is the tightening direction, extends straight in the axial direction. And is formed on the cutting blade 5a orthogonal to the same rotation direction. As for the second cutout groove 6, as shown in FIG. 4, among the both side edges in the circumferential direction, the side edge that is the rear side with respect to the rotation in the direction of arrow B, which is the loosening direction, extends straight in the axial direction. And is formed on the cutting blade 6a orthogonal to the rotation direction.

The operation of the bolt 1 configured as described above will be described by applying it to the case where the component 8 is attached to the vehicle body 7 of the automobile as shown in FIG. That is, the nut 9 is previously fixed to the vehicle body 7 by welding, and the bolt 1 is tightened in the screw hole 9 a of the nut 9. Although the vehicle body 7 is painted, when the component 8 is attached by the bolt 1 after the painting, the paint enters the screw hole 9a of the nut 9 and adheres to the inner surface of the nut 9 when the vehicle body 7 is painted.

In this state, the male screw 4 of the bolt 1 is tightened in the screw hole 9 a of the nut 9 in order to mount the component 8. Then, since the rotating direction of the bolt 1 at this time is the arrow A direction shown in FIG. 2, the male screw 4 peels off the paint adhering to the screw hole 9a of the nut 9 by the cutting blade 5a of the first notch groove 5. While being tightened by the nut 9, it comes to go.

On the other hand, when the component 8 is attached by the bolt 1 before painting the vehicle body 7, the paint adheres to the tip portion of the bolt 1 during the painting of the vehicle body 7 as shown by the chain double-dashed line C in FIG. Become so. Then, when the bolt 1 is loosened to remove the component 8 for replacement or the like, the rotation direction of the bolt 1 at this time is the direction of arrow B shown in FIG. 2, so the male screw 4 is the cutting blade of the second notch groove 6. 6a allows the paint adhering to the tip end to be peeled off and loosened. In this case, since the tip of the male screw 4 is formed in a taper shape and the depth of the groove of the male screw 4 becomes gradually shallower toward the front, the coating material is easily peeled from the valley of the male screw 4.

As described above, whether the bolt 1 is tightened or loosened, the coating material attached to the inner surface of the screw hole 9a by the cutting blades 5a and 6a and the coating material attached to the bolt 1 itself are peeled off by an arrow mark. Since it rotates in the A direction and the arrow B direction, the bolt 1 can be tightened and loosened easily.

In the above embodiment, the first and second cutout grooves 5 and 6 are formed, and the cutting blades 5a and 6a are formed in the cutout grooves 5 and 6, respectively. As in the other embodiments, which are different from each other, one notch groove 10 and 11 is formed, and one of the side edges extending in the axial direction of the shaft portion 2 has one side edge portion rotated in the tightening direction of the bolt 1. Sometimes, the cutting blades 10a, 11a exhibiting the peeling function may be formed, and the other side edge portion may be formed as the cutting blades 10b, 11b exhibiting the peeling function when the bolt 1 rotates in the loosening direction.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and is not limited to hexagonal bolts, for example, it can be widely applied to screws such as countersunk screws in general, and within the scope not departing from the gist. Various modifications can be implemented.

[0015]

[Effect of device]

 As described above, according to the present invention, regardless of whether the paint is attached to the screw hole for mounting the screw or the screw itself, the screw rotates while scraping off the paint, so tightening and loosening work can be performed. It has an excellent effect that it can be performed easily.

[Brief description of drawings]

FIG. 1 is a side view of a screw showing an embodiment of the present invention.

[Figure 2] Bottom view

FIG. 3 is an enlarged side view of a first cutout groove portion.

FIG. 4 is an enlarged side view of a second cutout groove portion.

FIG. 5 is a vertical cross-sectional view showing a state where components are fixed.

6A and 6B show another embodiment of the present invention, in which FIG. 6A is a side view of a main part, and FIG.

FIG. 7 is a view corresponding to FIG. 6 showing still another embodiment of the present invention.

[Explanation of symbols]

1 is a bolt (screw), 2 is a shaft portion, 5 is a first notch groove, 5
a is a cutting blade, 6 is a second notch groove, 6a is a cutting blade, 10,
Reference numeral 11 is a notch groove, and 10a, 10b, 11a and 11b are cutting blades.

Claims (1)

[Scope of utility model registration request] 1. At least one notch groove extending in the axial direction is formed at a tip portion of a shaft portion, and a side edge of both side edges of the notch groove in a circumferential direction which is a rear side with respect to rotation in a screw tightening direction. Is formed on the cutting blade, and a side edge on the rear side with respect to the rotation in the loosening direction of the screw is formed on the cutting blade.