JP2002266831A - Nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hasten and ensure the fastening operation of a nut by releasing the screwing of a bolt with a nut segment, when pressing a nut in the fastening direction to the bolt, to slide the nut segment in the axial direction of the bolt. SOLUTION: This nut 20 comprises an inclined hole 23 conically formed so as to reduce the diameter from the inner circumferential middle part of a nut body 21 to the lower end thereof and a plurality of nut segments 25 with female thread part 25a threaded thereon arranged in the inclined hole so as to be slidable in the axial direction of the nut body, and the nut segment is energized by an elastic body in the diameter reducing direction of the inclined hole. In this nut 20, the valley part 25b of the female thread part of each nut segment 25 is formed so as to be substantially equal in diameter to the ridge part 33b of the bolt male thread part when the lower end of the nut segment 25 is located in the lower end of the inclined hole 23 that is an initial position of upward movement in the insertion of the bolt 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut, and in particular, when a nut is pressed against a bolt in a fastening direction, the bolt and the nut segment are disengaged from each other and the nut segment is displaced in the axial direction of the bolt. TECHNICAL FIELD The present invention relates to a nut which is formed so as to slide in a direction, and which can easily and reliably execute a tightening operation of the nut.

[0002]

2. Description of the Related Art A conventional nut of this type is shown in FIGS.
A description will be given with reference to FIG. In FIG. 6, reference numeral 1 denotes a nut, which is a nut body 2 having an outer side formed in a polygonal shape, and a flange 3 provided at a lower end of the nut body 2.
Consisting of As shown in FIG. 7, the nut main body 2 has an inclined hole 4 formed in the inner peripheral portion with a small diameter toward the fastening direction.
And three long pieces 5 extending in the axial direction are formed on the inner peripheral surface of the nut body 2 forming the inclined hole 4.
5 and 5 are fixedly installed at equal intervals. Further, three nut segments 6, 6, 6 threaded with female screw portions 6a, 6a, 6a are arranged on the long pieces 5, 5, 5 so as to be slidable in the axial direction. The nut segment 6 has an outer peripheral surface on the fastening side formed with a small diameter and an outer peripheral surface on the side opposite to the fastening side formed with a large diameter.
When the nuts 6, 6 are disposed between the long pieces 5, 5, 5, the outer peripheral surfaces of the nut segments 6, 6, 6 abut against the inner peripheral surface of the nut body 2 forming the inclined hole 4. And the internal thread portions 6a,
6a, 6a are formed to be parallel to the axial direction and to be screwed with the bolt 11 (see FIG. 8). A washer 7 is mounted on the upper ends of the nut segments 6, 6, 6, and a coil spring 8 is provided on the upper surface of the washer 7. The nut segments 6, 6, 6 are urged by the urging force of the coil spring 8 in the small diameter direction of the inclined hole 4, that is, in the fastening direction. A washer 9 is provided at the upper end of the coil spring 8, and the washer 9 is fixed to the upper end of the nut body 2.

[0003] As shown in FIG. 3 (b), the lower ends of the nut segments 6, 6, 6 are the lower ends of the inclined holes 4 provided in the nut main body 2, and When it is located at the initial sliding position of the nut segments 6, 6, 6, the female thread portion 6a of the nut segment 6, 6, 6
The diameter A of the valley portion 6b and the diameter B of the crest portion 11b of the male screw portion 11a of the bolt 11 are configured so that φA <φB.

When the nut 1 is applied, as shown in FIG. 8, a bolt 11 is fixed to a member 10 such as wood, and a member 12 such as wood is fixed to the member 10. And the bolt 1
1 through. Then, the nut 1 is attached to the bolt 11.
When the nut 1 is pressed to the left in the figure, the nut segments 6, 6, 6 of the nut 1 are pressed by the male thread portion 11a of the bolt 11, and the nut segments 6, 6, 6 Moves largely rightward against the coil spring 8. Therefore, the nut segments 6, 6, 6
Is expanded outward, and the female threads 6a, 6a, 6a of the nut segments 6, 6, 6 and the male threads 11 of the bolt 11 are formed.
The nut body 2 is relatively easily displaced to the left. And the flange 3 of the nut body 2
When the nut abuts against the member 12 to be fastened, the nut 1 stops moving, and the female screw portions 6a, 6a, 6a and the male screw portion 11 are stopped.
a is screwed again.

Further, at this point, when the nut body 2 is rotated several times in the fastening direction, the nut segments 6, 6,
The female nuts 6a, 6a, 6a and the male screw 11a of the bolt 11 are screwed with each other.
And the bolt 11 fastens the member to be fastened 10 and the member to be fastened 12. Then, the members to be fastened 10 and 12
Are sufficiently fastened, nails 13 are inserted into the flange 3 to fix the nut 1 to the member 12 to be fastened.

Thereafter, when the members to be fastened 10 and 12 are displaced by shrinkage or the like due to aging, the members to be fastened 1 and 12 are displaced.
2 the nut 1 fixed by the nails 13
Moves following the displacement. That is, the nut segments 6, 6, and 6 in the nut 1 are disengaged from the bolt 11 and move. After the movement, the nut segments 6, 6, and 6 are reengaged with the bolt 11. Thus, the nut 1 can prevent loosening after construction.

[0007]

The above-mentioned conventional nut has the following problems.
When the lower end of the nut segment is the lower end of the inclined hole provided in the nut main body, and at the initial sliding position above the nut segment, the diameter of the female thread valley of the nut segment is the above-mentioned. When the bolt is inserted through the nut, the nut segment is hooked on the threaded portion of the bolt and slides upward to a substantially upper limit position when the bolt is formed to have a diameter smaller than the diameter of the male thread portion of the bolt. And then,
Since the nut segment is screwed to the inserted bolt with the nut body stopped at a predetermined position, the nut is tightened to the bolt by rotating the nut body several times. As described above, when the nut is tightened to the bolt after the bolt is inserted into the nut, the nut body has to be rotated several times, which is troublesome to handle and wastes time.

Therefore, when the bolt is inserted into the nut, the movement of the nut segment is minimized, and when the bolt is inserted over a predetermined length, the tightening and rotating operation of the nut is also minimized, thereby tightening the nut. A technical problem to be solved arises in order to ensure that the operation is performed easily and reliably, and an object of the present invention is to solve the problem.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and has a conical inclined shape having a small diameter from an intermediate portion of an inner peripheral portion of a nut body toward a lower end portion thereof. A plurality of nut segments each having a female screw threaded in the inclined hole are slidably disposed in the axial direction of the nut main body, and the nut segment is provided with the nut segment. A nut configured to be urged in the small-diameter direction of the inclined hole by an elastic body provided on an upper surface, wherein the nut is configured to be inserted into the nut and tightened to the bolt. When the lower end of the nut segment is the lower end of the inclined hole provided in the nut main body and is at the initial movement position of the nut segment upward when the bolt is inserted, each nut segment There is provided a nut diameter of the recess portion of the cement female screw portion and the peak portion of the bolt male screw portion is formed to be substantially the same.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. In the figures, reference numeral 20 denotes a nut, and as shown in FIGS. 1 and 2, the nut 20 has a flange 22 fixed to a lower end of a nut body 21 having an outer portion formed in a polygonal shape. The inner part of the nut body 21 has a conical inclined hole 23 formed with a small diameter toward the lower end.

Further, on the inner peripheral surface of the inclined hole 23, elongated pieces 24, 24, 24 extending in the axial direction are fixed at equal intervals and fixed between the elongated pieces 24, 24, 24. Nut segments 25, 25, 25 are slidably disposed in the axial direction. Further, female threads 25a are provided on the inner surfaces of the nut segments 25, 25, 25, respectively.
The outer peripheral surfaces of the nut segments 25, 25, 25 are formed as inclined surfaces corresponding to the inclined holes 23. That is, the nut segments 25, 25, 25 are formed to have a small diameter toward the lower side, and the outer peripheral surfaces of the nut segments 25, 25, 25 contact the inner peripheral surface of the inclined hole 23 to be slidable in the axial direction. It is formed so that it can move. On the other hand, the inner peripheral surfaces of the nut segments 25, 25, 25 are formed in parallel to the axial direction, and the female screw portions 25a, 25a, 25
a is provided. Further, each nut segment 25,
A leaf spring 26 is interposed between upper inner surfaces of a cover 29 described later on the upper surfaces of the first and second covers 25 and 25.

The leaf spring 26 is formed in a donut shape as shown in FIGS. 2 and 4.
6 are cut and raised on one side in the width direction so as to be equally divided into three, and cut and raised while leaving the base portion, and provided with cutout lines 28a, 28a, 28a, and the cut and raised cutout lines 28a, 28a through the cut and raised base portion. , 28a are formed so that each of the arc portions 28, 28, 28 is bent upward to provide elasticity. The leaf spring 26 is connected to the nut segments 25 and 2.
5 and 25 are mounted on the upper surface.

The nut body 21 is covered with a cover 29, and a certain space is provided between the upper inner surface of the cover 29 and the nut body 21. The leaf spring 26 is provided in the space. The nut segments 25, 25, 25 are urged downward by the arc portions 28, 28, 28 provided on the leaf spring 26.

Hooks 30, 30, 30 are formed at the lower end of the cover 29, and the hooks 30, 31, 31 are formed by cutting out the lower ends of the nut bodies 21. The cover 29 is fixed to the nut main body 21 by locking the 30, 30.

As shown in FIG. 3 (a), the lower ends of the nut segments 25, 25, 25
Near the lower end of the nut segment 2
5, 25, 25, when in the initial sliding position, the female threads 25a, 25a of the nut segments 25, 25, 25
The diameter C of the valleys 25b, 25b, 25b of 25a, 25a and the diameter D of the ridge 33b of the male screw 33a of the bolt 33 described later.
Are formed so that φC ≒ φD.

When the nut 20 is used, first, as shown in FIG.
Is fixed to the bolt 33. Then, the bolt 33 fixed to the fastening member 32 is passed through another fastening member 34,
Further, by pressing the nut 20 against the bolt 33, the nut segments 25, 2 of the nut 20 are pressed.
5 and 25 are formed with the bolts 33, 25c, 25c.
When the nut segments 25, 25, 25 are pressed by the crests 33b of the male screw portion 33a and slide upward (to the right in FIG. 5) by approximately one pitch, the nut segments 25, 25, 25 are opposed to the leaf springs 26. The inner diameter of the nut 20 is enlarged, and the female threads 25a, 25a, 25a of the nut segments 25, 25, 25 are increased.
The peaks 25c, 25c, 25c and the peak 33b of the male screw 33a of the bolt 33 have substantially the same diameter.

At this time, the nut segments 25, 2
Since the plate springs 5 and 25 are urged downward by the leaf spring 26, the ridges 33b of the male screw portions 33a of the bolts 33 are formed into the female screw portions 25a and 2
The bolt 33 is inserted into the nut 20 by a predetermined length over the peaks 25c, 25c, 25c of 5a, 25a. At this time, the female threads 25a, 25a, 25a of the nut segments 25, 25, 25 and the male thread 33a of the bolt 33 are screwed together by the bias of the leaf spring 26.

Then, by rotating the nut 20 in the fastening direction, the nut 20 and the bolt 33 tighten the members 32 and 34 to be fastened. Thereafter, the flange 22 is fixed to the member to be fastened 34 with nails 35,35. At this time, the nut segments 25, 25, 25
Is slightly slid upward by one pitch when the bolt 33 is inserted, so that the rotation of the nut 20 in the fastening direction can be easily performed within approximately 90 ° so that the nut 20 can be easily attached to the bolt 33. Be sure to be tightened.

When the fastened members 32 and 34 such as wood contract after the fastening operation, the nut 20 fixed to the fastened member 32 moves following the shrinkage. The nut segment 25 of the nut 20
25, 25 and the bolt 33 are disengaged from each other and move in the tightening direction. Then, the movement is stopped, and the nut 20 and the bolt 33 are screwed again. Therefore, loosening of the member after fastening can be prevented by the nut 20.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0021]

According to the present invention, as described in the above embodiment, the lower end of the nut segment is the lower end of the inclined hole provided in the nut body, and the bolt is inserted into the nut body. When the nut segment is at the initial movement position upward when the nut segment is formed, the diameter of the valley portion of the female screw portion of each nut segment and the crest portion of the male screw portion of the bolt are substantially the same. At the initial stage of the insertion of the bolt, the valley of the female thread of the nut segment and the ridge of the male thread of the bolt are hooked to each other, and the nut segment is moved by about one pitch in the direction opposite to the direction of tightening the nut. Slide it. Furthermore,
When the bolt is inserted, the ridge of the male thread of the bolt is disengaged from the ridge of the female thread of the nut segment together with the bias of the leaf spring, and the nut segment is Said 1
The bolt is inserted into the nut by a predetermined length while being locked at the sliding position corresponding to the pitch. Therefore, when the nut is rotated to tighten the nut to the bolt, the nut segment slides only by, for example, one pitch, as described above. The rotation range at the time can be realized within approximately 90 °.

Thus, the tightening operation of the nut is easy, and the nut can be quickly and surely tightened to the bolt, thereby improving the workability of tightening the nut.
This is an invention that has a truly significant effect, such as contributing to cost reduction.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a front view of a nut.

FIG. 2 is a longitudinal sectional view showing a state in which a cover is covered with the nut of FIG. 1;

FIG. 3A is an explanatory view showing one embodiment of the present invention and showing a ratio between a diameter of a nut segment and a diameter of a bolt.
(B) is an explanatory view showing a ratio between a diameter of a nut segment and a diameter of a bolt in a conventional example.

FIG. 4 is an enlarged plan view of a leaf spring.

FIG. 5 is a longitudinal sectional view of a main part showing a state where the member to be fastened is tightened by the nut and the bolt of FIG. 1;

FIG. 6 is a front view of a conventional nut.

FIG. 7 is a sectional view taken along line BB of FIG. 5;

FIG. 8 is a partially cutaway longitudinal sectional view showing a state in which members are tightened by a conventional nut and bolt.

[Explanation of symbols]

 Reference Signs List 20 nut 21 nut body 22 flange 23 inclined hole 25 nut segment 25a female screw part 25b valley 25c crest 26 leaf spring 33 bolt 33a male screw 33b crest

Claims (1)

[Claims] 1. A plurality of conical inclined holes having a small diameter from an intermediate portion of an inner peripheral portion of a nut body toward a lower end thereof, and a female screw portion is threaded in the inclined holes. The nut segment is disposed so as to be slidable in the axial direction of the nut body, and the nut segment is urged in the small diameter direction of the inclined hole by an elastic body provided on the upper surface of the nut segment. In a nut configured to insert a bolt through the nut and tighten the nut to the bolt, a lower end of the nut segment is a lower end of an inclined hole provided in the nut body. And when the nut segment is at the initial movement position above the nut segment when the bolt is inserted, the roots of the female threads of the nut segments and the ridges of the male threads of the bolt have substantially the same diameter. Is formed A nut characterized in that: