JP2010096199A - Bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt having current-carrying property and elastic force enough to efficiently prevent the looseness. <P>SOLUTION: The bolt comprises a screw shaft 3 having a screw thread 2, and a head portion formed at one end thereof, wherein bending generation portions 6 are formed by bending at least one or more front ends of the screw thread 2 toward the head portion. The plurality of bending generation portions 6 are formed at equal spaces on the circumference of the screw thread 2 of the whole screw shaft 3. Otherwise, the plurality of bending generation portions 6 are formed at equal spaces on the circumference of the screw thread 2 at the front end, center or rear end of the screw shaft 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bolt used mainly for grounding or used in a place where it is necessary to prevent loosening.

Conventionally, this type of bolt has a head at one end in the axial direction of a substantially cylindrical shaft, a taper with a small tip diameter at the other end of the shaft, and at least one of the taper. And a plurality of flank surfaces of the normal thread formed on the shaft portion have edges protruding from the flank surfaces. Convex portions were provided.

Therefore, when the bolt is screwed onto the nut, the paint in the nut is peeled off by the convex portions having edges protruding from the flank surfaces on the flank surface of the bolt thread so that the conductive property is provided. Can be screwed in, but the convex part protruding from the flank requires extra force when screwing with the nut, and the convex part protruding from the bolt flank interferes with the flank of the nut. There was a drawback that it was not easy to loosen.
JP-A-10-184737

    The present invention has been made in view of the above-described conventional drawbacks, and an object of the present invention is to provide a bolt capable of obtaining electrical conductivity and efficiently preventing loosening with an elastic force.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

In order to achieve the above object, according to the present invention, in a bolt having a head formed at one end of a screw shaft on which a screw thread is formed, at least one tip of the screw thread is directed toward the head. A bent bending generating portion is formed to constitute a bolt.

  As is clear from the above description, the present invention has the following effects.

(1) In a bolt having a head formed at one end of a screw shaft on which a thread is formed, a bending generating portion is formed by bending at least one tip of the thread toward the head. Therefore, when screwed with the nut, the paint can be peeled off at the bending generating portion even if the paint adheres to the thread of the nut.
Therefore, the bolt and the nut can be reliably energized and used as a ground bolt.

(2) According to the above (1), the nut can be pressed with an elastic force in the tightening direction by the bending generating portion.
Therefore, it is difficult to loosen, and it is possible to efficiently prevent the bolt from falling off, and it can be used without providing a separate loosening prevention means.

(3) According to the above (1), when the screw is engaged with the nut, the elastic force of the bending generating portion contacts the screw thread of the nut, so that the screw can be relatively smoothly engaged.

(4) In the second aspect, the same effects as in the above (1) to (3) can be obtained, and the effect of the bending generating section can be obtained more reliably.

(5) Claim 3 can obtain the same effects as the above (1) to (3), and can be optimally used for a part whose purpose of use is limited.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

  In the first preferred embodiment for carrying out the present invention shown in FIGS. 1 to 7, reference numeral 1 denotes a bolt according to the present invention which can be used as a ground bolt. The bolt 1 is a screw having a thread 2 formed thereon. A head 4 is formed at one end of the shaft 3, and a bolt main body 5 formed so that the other end is sequentially reduced in diameter, and the tip of the screw thread 2 of the bolt main body 5 are spaced at a predetermined interval. It is comprised with the bending generation part 6 bent to the direction.

  The bending generating portions 6 are formed on the circumference of the thread 2 of the entire screw shaft 3 at equal intervals, in the present embodiment, at intervals of 120 degrees and with a width of about 30 degrees.

The bolt 1 having the above configuration is used by being screwed and fixed to a welding nut 7 in an assembly line of an automobile, for example.
When the bolt 1 is screwed into the welding nut 7, when the bending generating portion 6 of the bolt 1 is screwed with the thread 8 of the welding nut 7 to which the paint is adhered, the screw 1 is screwed while peeling the paint. The bending force generated by the bending generating portion 6 presses the welding nut 7 in the tightening direction acts.
For this reason, while being able to make the volt | bolt 1 and the welding nut 7 into an energized state reliably, the slack of the volt | bolt 1 can be prevented efficiently.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 8 to 25 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIG. 8 to FIG. 10 is mainly different from the first embodiment for carrying out the present invention in that it is about 30 degrees at intervals of 90 degrees. Since the bending generating portion 6 having a width dimension is formed at the tip of the screw thread 2, the best first embodiment for carrying out the present invention can be applied to the bolt 1 </ b> A having such a bending generating portion 6. The same effect can be obtained.

  The third embodiment for practicing the present invention shown in FIGS. 11 to 13 is different from the first best mode for practicing the present invention mainly in that bending occurs with a width of about 90 degrees. Since the portion 6A is formed at the tip of the screw thread 2 at a predetermined interval, the bolt 1B having such a bending generating portion 6A is the same as the best first embodiment for carrying out the present invention. Effects can be obtained.

  The fourth embodiment for carrying out the present invention shown in FIGS. 14 to 16 is mainly different from the best first embodiment for carrying out the present invention from the central portion of the screw shaft 3 to the tip portion. Since the bending generating portion 6 is formed between the bolts 1C having the bending generating portion 6 formed in this manner, the same effect as that of the best first embodiment for carrying out the present invention can be obtained. It is done.

  The fifth embodiment for carrying out the present invention shown in FIGS. 17 to 19 is mainly different from the best first embodiment for carrying out the present invention from the center of the screw shaft 3 to the head. 4, the bending generating portion 6 is formed between the bolts 1 </ b> D having the bending generating portion 6 as described above, and the same effect as that of the first preferred embodiment for carrying out the present invention is obtained. can get.

  The sixth embodiment for carrying out the present invention shown in FIGS. 20 to 22 is mainly different from the best first embodiment for carrying out the present invention in that the central portion excluding both ends of the screw shaft 3 is different. Since the bending generating portion 6 is formed in the portion, even the bolt 1E having the bending generating portion 6 formed in this way can obtain the same operational effects as those of the best first embodiment for carrying out the present invention. .

  The seventh embodiment for carrying out the present invention shown in FIGS. 23 to 25 is mainly different from the best first embodiment for carrying out the present invention in that the tip portion is successively made smaller in diameter. The bolt 1F having the bending generating portion 6B formed in this manner is formed in that the bending generating portion 6B having a width of about 360 degrees is formed at the tip of the screw thread 2 at the center of the rod-shaped screw shaft 3 that is not formed. However, the same effect as the best first embodiment for carrying out the present invention can be obtained.

  The present invention is mainly used in the manufacturing industry of bolts used as earth bolts.

1 is a front view of the best first embodiment for carrying out the present invention. The left view of the best 1st form for implementing this invention. The right view of the best 1st form for implementing this invention. The expanded sectional view which follows the 4-4 line of FIG. The principal part expanded sectional view of FIG. Explanatory drawing of the state which acts from the state from which the axial force is not acting on a bending generating part. The principal part explanatory drawing of the state screwed together with the nut of the best 1st form for implementing this invention. The front view of the 2nd form for carrying out the present invention. The right view of the 2nd form for carrying out the present invention. The expanded sectional view which follows the 10-10 line of FIG. The front view of the 3rd form for carrying out the present invention. The right view of the 3rd form for carrying out the present invention. The expanded sectional view which follows the 13-13 line of FIG. The front view of the 4th form for carrying out the present invention. The right view of the 4th form for carrying out the present invention. The expanded sectional view which follows the 16-16 line of FIG. The front view of the 5th form for carrying out the present invention. The right view of the 5th form for implementing this invention. The expanded sectional view which follows the 19-19 line of FIG. The front view of the 6th form for carrying out the present invention. The right view of the 6th form for carrying out the present invention. The expanded sectional view which follows the 22-22 line of FIG. The front view of the 7th form for implementing this invention. The right view of the 7th form for implementing this invention. The expanded sectional view which follows the 25-25 line of FIG.

Explanation of symbols

1, 1A, 1B, 1C, 1D, 1E, 1F: bolt,
2: Thread, 3: Screw shaft,
4: Head, 5: Bolt body,
6, 6A, 6B: Bending generator,
7: Nut, 8: Screw thread.

Claims (3)

In a bolt having a head formed at one end of a screw shaft on which a screw thread is formed, a bending generating portion is formed by bending at least one tip of the screw thread toward the head. Bolt to be. 2. The bolt according to claim 1, wherein a plurality of bending generating portions are formed so as to have a plurality at equal intervals on the circumference of the screw thread of the entire screw shaft. 2. The bolt according to claim 1, wherein a plurality of bending generating portions are formed so as to have a plurality at equal intervals on a circumference of a screw thread at a front end portion, a central portion or a rear end portion of the screw shaft.

Images