JP3201917B2 - One-touch nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a so-called one-touch nut which is screwed into a bolt by simply inserting an appropriate bolt into an insertion hole.

[0002]

2. Description of the Related Art In order to facilitate the screwing operation of a nut to an appropriate bolt, the rod portion of the bolt is simply inserted into the insertion hole of the nut without particularly rotating the nut with respect to the bolt. Conventionally, as a nut capable of being screwed to the bolt, FIGS.
The structure shown in FIG.

As shown in FIG. 15, this conventional nut is curved in an arc shape in a cylindrical main body 100 and has three divided pieces 200... Are housed so that the insides of the curves face each other, and a washer 400 contacting the divided piece 200 is provided.
And the spring 300 housed between the bottom washer 500 and
Into the insertion hole 101 of the main body 100, face the opening 101 a on the front side of the insertion of the bolt B of the insertion hole 101.
.. 200 are always energized. As shown in FIGS. 16 to 18, the hole wall of the insertion hole 101 of the main body 100 is
The diameter is gradually increased from the opening 101a on the insertion entrance side toward the insertion rear side.

Accordingly, according to this conventional nut, FIG.
As shown in FIG. 6 and FIG. 17, when the bolt B is inserted from the opening 101a side of the insertion hole 101, the divided pieces 200.
Of the divided pieces 200... 200
When the bolt is moved to the back side where the bolt B is inserted, since the hole diameter of the insertion hole 101 is increased toward the back side, the interval between the divided pieces 200. As a result, the rod portion of the bolt B is desired to be inserted into the male screw B 'of the bolt B by simply inserting the nut into the male screw B' without particularly rotating the nut. Can be inserted up to the position.

When the insertion of the bolt B is stopped, each of the divided pieces 200... 200 is constantly biased toward the opening 101a by the spring 300.
As shown in FIG. 18, each divided piece 200.
The divided pieces 200 are moved by the bias toward the opening 101a side of the main body 100 to a position where the interval between the divided pieces 200 is narrowed until the inside of the curve is tightly attached to the rod portion of the inserted bolt B. Female screw to male screw B '
Engage 1 As a result, the nut can be screwed to the bolt B at the desired position.

That is, according to this conventional nut, when the screw is screwed to the bolt B, the bolt B is attached to the nut body 10.
No special rotation of the nut is required to insert the nut into the insertion hole 101, thereby facilitating the screwing operation of the nut to the bolt B at a pinch where rotation of the nut is difficult or at a location where it is difficult to reach. Met.

[0007]

However, in order to construct this conventional nut, as shown in FIG. 15, there is a difficulty in requiring a plurality of parts, which not only requires manufacturing labor, but also requires time and effort.
There was an inconvenience that it was difficult to provide at low cost.

After the nut is screwed onto the bolt B, when the screw is released, each of the divided pieces 200
.. 200 need to be rotated to unscrew the female screw 201 provided on the male screw B ′ and the male screw B ′ of the bolt B.
Are arranged to be engaged with the male screw B 'of the bolt with a certain space between each of the divided pieces 200... 200.
0... 200 are too close to each other, the female screw 201 of one divided piece 200 and the other divided piece 2
00 and the female thread 201 of the split piece 200 are displaced, and the female thread 201 of one of the divided pieces 200 bites into the male screw B ′ of the bolt B due to the displacement. As a result,
The smooth rotation of the nut may be hindered.

Further, the annular washer 400 attached to the split piece 200 is displaced or the like, and the washer 400
200 may protrude between the curved surfaces of the divided pieces 200... 200 and hit the tip of the bolt B inserted into the insertion hole 101, thereby obstructing the insertion.

Therefore, the present invention minimizes the number of parts constituting this kind of one-touch nut, and allows a bolt to be inserted and screwed securely at all times. It is another object of the present invention to provide a one-touch nut capable of releasing the screw connection.

[0011]

In order to solve the above-mentioned problems, according to the present invention, a one-touch nut is housed in a cylindrical main body 10 having an insertion hole 11 for a bolt B, and is housed in the cylindrical main body 10. , The male screw B 'of the bolt B to be inserted
A nut made of a plastic female screw member 20 having a female screw 20 ′ screwed into the nut, wherein the insertion hole 11 of the bolt B of the cylindrical main body 10 is entirely or partially formed with a hole wall 15. Is an inclined surface 15 for gradually increasing the hole diameter of the insertion hole 11 from the insertion entrance side of the bolt B toward the back side.
The female screw member 20 is composed of a plurality of divided pieces 21... 21 connected via a thin hinge part 21b.
The female screw member 21 is provided with a female screw portion 21 a ′ which is rounded by a screw and constitutes a female screw 20 ′ of the female screw member 20. 20 is provided with an elastic piece 21c that constantly urges the insertion side of the cylindrical body 10 toward the insertion / entrance side, and the female screw member 20 of the female screw member 20 accommodated in the insertion hole 11 of the cylindrical body 10 is provided. As the divided piece 21 is moved to the inner side of the insertion hole 11 against the urging, the interval between the internal thread portions 21a 'of the divided pieces 21... 21 is increased. .

[0012]

The one-touch nut according to the present invention uses a bolt B
Cylindrical body 10 having an insertion hole 11
And the male screw B 'of the bolt B to be inserted
And a female screw member 20 made of plastic provided with a female screw 20 ′ meshed with the bolt B. The insertion hole 11 of the cylindrical main body 10 has a hole diameter that goes toward the back from the insertion side of the bolt B. The female screw member 20 is composed of a plurality of divided pieces 21... 21 connected via a thin hinge portion 21b, and the female screw member 20 is an elastic piece 21c. Are constantly biased toward the insertion side of the bolt B, and as the bolt B is moved deeper into the insertion side against the bias, the space between the female screw portions 21a 'of the divided pieces 21. .. 21 with the insertion of the bolt B into the insertion hole 11, the divided pieces 21.
a ′ contacts the male screw B ′ of the bolt B, and the elastic piece 21
c, while being moved to the inner side of the insertion hole 11 against the urging force of the insertion hole 11, the interval between the female screw portions 21 a ′ of each of the divided pieces 21 is increased, and the cylindrical body 10 is particularly rotated with respect to the inserted bolt B. Even without this, the rod of the bolt B can be inserted into the insertion hole 11.

After that, when the insertion of the bolt B into the insertion hole 11 is stopped, each of the divided pieces 21 becomes the elastic piece 2.
By the bias of 1c, the insertion hole 11 is moved again to the insertion entrance side of the insertion hole 11, and since the insertion hole 11 is configured to be narrow at the insertion entrance side, each of the divided pieces 21. The male screw B 'of the bolt B which is rounded in at the entrance side so as to reduce the interval between the female screw portions 21a' and is inserted.
Into the female screw portion 21a '.

The screw connection with the bolt B is performed by rotating the cylindrical main body 10 so that the male screw B 'and the female screw 20' of the inserted bolt B are unscrewed. Since each of the divided pieces 21... 21 having the internal thread is connected via a hinge portion 21b,
With the rotation of 0, the distance between the divided pieces 21... 21 does not become dull, and the distance is always kept constant.
Female screw formed at 1 ... 21 and bolt B inserted
The engagement with the male screw B 'is always smooth.

[0015]

【Example】

A typical embodiment of a one-touch nut according to the present invention will be described below with reference to FIGS.

FIG. 1 shows a cylindrical main body 10 constituting a one-touch nut according to the embodiment and a female screw member 20 housed in the cylindrical main body 10 so as to be easily understood.
FIG. 2 is a perspective view showing a state where the female screw member 20 is taken out of the cylindrical main body 10.

FIGS. 2 to 6 show the cylindrical main body 10 with a bottom cover 12 so that the configuration of the cylindrical main body 10 can be easily understood.
Are shown from the side (FIG. 2) and the side surface (FIGS. 5 and 6) where the is provided, and the side cross section (FIGS. 3 and 4).

FIGS. 7 to 9 show a female screw member 20.
In order to facilitate understanding of the configuration, the female screw member 20 is divided into the side where the female screw portion 21a 'is formed (FIG. 7), the side where the elastic piece 21c is formed (FIG. 8) and the side surface (FIG. 9). Respectively.

FIGS. 10 to 14 show the steps of screwing the bolt B in order, so that the use state of the one-touch nut can be easily understood. Here, FIG.
FIG. 11 is a side sectional view showing a state before the bolt B is inserted, and FIG. 11 shows a state before the bolt B is inserted on the side where the bottom cover 12 is provided (the bottom cover 12 is omitted). Yes.)
Respectively. FIG. 12 shows bolts B
13 is a side sectional view, and FIG. 13 shows the bolt B inserted from the side where the bottom cover 12 is provided (the bottom cover is omitted). I have. Further, FIG. 14 shows that the male screw portion 21 of the female screw member 20 is attached to the male screw B ′ of the bolt B inserted as described above.
The state where a ′ is engaged is shown in a state of a side cross section.

As shown in FIG. 1, a one-touch nut according to this embodiment includes a cylindrical main body 10 having an insertion hole 11 for a bolt B communicated in a vertical direction,
And a female screw member 20 having a female screw 20 ′ which is housed in the insertion hole 11 and meshes with the male screw B ′ of the bolt B inserted into the insertion hole 11.

The one-touch nut is shown in FIG.
As shown in FIG.
For example, the female screw portion 21a 'of the female screw member 20 is engaged with the male screw B' of the bolt B which is inserted in communication with the holes H, H 'of the two panel materials P, P', respectively. The two panel materials P, between the head of the bolt B and the one-touch nut, are screwed together.
It is used to tighten and assemble P '.

First, the configurations of the cylindrical main body 10 and the female screw member 20 which constitute the one-touch nut will be described in detail.

As shown in FIG. 1, the cylindrical main body 10 is
A main body 10 ′ having an insertion hole 11 for the bolt B communicated in a vertical direction, and a disc-shaped bottom cover for closing an opening 11 b of the insertion hole 11 on the back side of the main body 10 ′ where the bolt B is inserted. 12 are provided.

In this embodiment, in particular, the cylindrical main body 10 is integrally formed by using a plastic material, and the main body 10 'and the bottom lid 12 are connected to each other by the main body 10'.
Are connected integrally by a thin hinge portion 13 provided between the edge of the opening 11b on the back side of the insertion of the bolt B and the outer edge of the bottom cover 12.

The bottom cover 12 is provided with a hole 12a which is communicated with the insertion hole 11 of the main body 10 'when the hinge 13 is bent to close the opening 11b of the main body 10'. ing. The diameter of the hole 12a is smaller than the diameter of the insertion hole 11 on the opening 11b side.

An annular projection 12b is formed at the periphery of the hole 12a of the bottom cover 12, and the projection 12b is in contact with the inner periphery of the opening 11b of the main body 10 '. Then, the bottom lid 12 is configured to close the opening 11b of the main body 10 'by fitting the projection 12b into the insertion hole 11.

Further, in this embodiment, the hinge 1
At the edge of the bottom cover 12 on the side opposite to the side on which the bottom cover 3 is provided, a gap between the tips of a pair of protruding pieces standing upright at an interval in a direction substantially perpendicular to the surface of the bottom cover 12 is provided. An engagement hole 12c that is substantially square with the edge of the bottom cover 12 is formed by being connected thereto, while the hinge portion 13 of the main body 10 'is formed.
At the outer edge of the opening 11b on the side opposite to the side where the opening 11b is provided, an engaging projection 14 that engages with the engaging hole 12c when the opening 11b is closed by the bottom lid 12 is provided. The bottom lid 12 is configured to stably maintain the state in which the opening 11b is closed.

An opening 11a on the insertion hole 11 side of the bolt B in the insertion hole 11 of the main body 10 'is formed with an inner flange 11a' so as to go around the inner periphery of the opening 11a.

The hole wall 15 of the insertion hole 11 is formed with an inclined surface 15a for gradually increasing the diameter of the insertion hole 11 from the opening 11a toward the opening 11b.

Further, the hinge portion 1 of the insertion hole 11
The insertion hole 11 is provided in the hole wall 15 on the side where the 3 is provided.
The female screw member 2 extending from the opening 11a to the opening 11b and protruding toward the inside of the insertion hole 11.
A regulating projection 16 for preventing rotation of the insertion hole 11 in the insertion hole 11 is formed.

In this embodiment, a plurality of protrusions 1 extending along the height direction of the cylindrical body 10 are provided outside the cylindrical body 10.
7, 17,... Are formed so that the tubular main body 10 can be easily gripped.

Next, as shown in FIGS. 1, 7, 8 and 9, the female screw member 20 has an arc-shaped cross section, and the female screw portion 21
a ′ with the hinge part 21.
b, and are integrally formed using a plastic material.

Each of the divided pieces 21... 21 is composed of both side edges of the divided piece 21 positioned at the center and the divided pieces 2 positioned at the center.
1, the thin plate-shaped hinge portions 21b, 21b formed between the split pieces 21, 21 positioned on both sides of the split piece 21 and a side edge directed toward the split piece 21 positioned at the center. The arc-shaped surfaces 21a are connected so as to be located in the same direction.

Each of the divided pieces 21 connected in this manner is
21 are provided with elastic pieces 21c at one end thereof, and the elastic pieces 21c project from the one end in an inclined manner so as to gradually move away from the one end.

In this embodiment, the elastic piece 21c is divided into three parts 21... The projection 21 is provided so as to protrude from the side where the hinge 21b is not provided between the piece 21 and the base 21 toward the side where the hinge 21b is provided. The base 21 is provided on the side where the hinge portion 21b is provided between the other split piece 21 and the other split piece 21 with the center split piece 21 interposed therebetween. In the piece 21, the central divided piece 21
And the base where the hinge 21b is provided is protruded toward the side where the hinge 21b is not provided.

Each of the divided pieces 2 connected as described above
The female screw portions 21a 'are formed on the arc-shaped surfaces 21a of each of the... 21 from the side edge on the one end side where the elastic piece 21c is provided toward the side edge side facing the edge. ing.

The female screw portion 21a 'is
21, a plurality of threads extending in the connecting direction of the divided pieces 21... 21 are formed on the arcuate surface 21a.
7, and a plurality of female threads of each female thread portion 21a 'provided on each of the divided pieces 21... 21 have substantially the same inclination. Each of the plurality of threads provided on one of the two adjacent divided pieces 21 and 21 has a corner, and each of the plurality of threads provided on one of the two divided pieces 21 is approximately equal to any one of the plurality of threads provided on the other divided piece 21. The configuration is such that the threads are aligned on the same straight line.

Therefore, as shown in FIG. 1 and FIGS. 10 to 14, the hinge portion 21b is bent so as to be rounded so that the arcuate surfaces 21a on which the female screw portions 21a 'are formed face each other. Each divided piece 21 ... 21
21a 'are positioned so that their threads are located along substantially the same vine winding, and are inserted between the arcuate surfaces 21a ... 21a of the divided pieces 21 ... 21 by this rounding. A female screw 20 ′ of the female screw member 20 that meshes with the male screw B ′ of the bolt B is configured.

As particularly shown in FIGS. 8 and 11, a hinge portion 21b for connecting the divided pieces 21.
Are not provided on the same surface as the arcuate surface 21a of each of the divided pieces 21... Therefore, as described above, each of the divided pieces 21
... Two pieces 2 adjacent to each other when rolling 21
1 and 21, further ahead of the position where the thick portion 21 e between the hinge portion 21 b and the arcuate surface 21 a provided between the divided pieces 21 and 21 contacts each other,
This adjacent one of the divided pieces 21 corresponds to the other divided piece 2
The arc-shaped surface 21a of each of the divided pieces 21.
It is configured such that a space for inserting the bolt B can be always secured between a ... 21a.

As shown in FIG. 1, the female screw member 20 is inserted into the insertion hole 11 through the opening 11 b which is not closed by the bottom lid 12, with respect to the cylindrical main body 10 having the above configuration. In a state in which the arcuate surfaces 21a are rounded so as to face each other, and the divided pieces 21, 21 on both sides sandwiching the central divided piece 21 of the divided pieces 21... 21 connected as described above. Regulating protrusion 1 between end faces 21f, 21f
6 is inserted from the side where the elastic piece 21c is not provided, and then the opening 11b is closed by the bottom cover 12, and the engagement hole of the bottom cover 12 is
The female screw member 20 is brought into contact with the peripheral edge of the hole 12a of the bottom cover 12 by engaging with the engagement projection 14 of the bottom cover 12 as shown in FIGS. Then, the cylindrical body 10 is urged toward the opening 11a side,
In a state of being pushed up, it is incorporated into the tubular main body 10.

Here, the opening 11 of the cylindrical body 10
a is formed with an inner flange portion 11a '.
The upper end surface of the female screw member 20 housed in the insertion hole 11 as described above contacts the step surface 11c formed between the hole 1a 'and the hole wall 15 of the insertion hole 11. Therefore, the female screw member 20 urged toward the opening 11a by the elastic piece 21c does not come out of the opening 11a.

The cylindrical body 10 has an inclined surface 15a formed in the hole wall 15 of the insertion hole 11 accommodating the female screw member 20, and the insertion hole 11 is formed by the inclined surface 15a. The diameter of the opening 11a is reduced, and the diameter is gradually increased toward the opening 11b. Therefore, FIG.
As shown in FIG. 0 and FIG. 11, the female screw member 20 located on the side of the opening 11a is configured so that the side surfaces of the divided pieces 21... In the state of being in contact with the side, each arc-shaped surface 21a is in a state of being relatively close to each other.

As described above, the opening 11a of the cylindrical main body 10 is
When the bolt B is inserted into the insertion hole 11 from the opening 11a of the tubular main body 10 from the state where the female screw member 20 is positioned on the side, the female screw member 20 is inserted into the male screw B 'of the bolt B. Female screw 20 'comes into contact, and the female screw member 20 is moved toward the inner side of the insertion of the bolt B against the bias of the elastic piece 21c.

However, as described above, the hole edge of the insertion hole 11 is located on the inner side of the bolt B, that is, the cylindrical main body 1.
Since the diameter is gradually increased toward the side of the opening 11b of the female screw member 20, the female screw member 20 inserted and moved toward the back side as described above
21 are slightly extended outward so as to be spaced apart from each other, so that the female screw portion 21a 'of the female screw member 20 is inserted into the female screw portion 21a' of the female screw member 20 toward the insertion deep side. The contact with the male screw B 'becomes loose.

Therefore, the rod of the bolt B can be inserted into the insertion hole 11 of the cylindrical body 10 without particularly rotating the cylindrical body 10 with respect to the inserted bolt B.

Thereafter, as shown in FIG. 14, the end of the tubular body 10 on the side of the opening 11a contacts the surface of the panel material P 'to which the bolts B are attached. When the insertion of the bolt B directed toward the opening 11b side of the female screw member is stopped, the female screw member 20 comes into contact with the elastic piece 21.
c is biased toward the opening 11a side, so that each of the divided pieces 21... 21 constituting the female screw member 20 has its arcuate surfaces 21a. It is moved toward the opening 11a side to a position where the interval is narrowed so as to bring them into close contact with each other, and at this movement end position, as shown in FIG. The provided female screw portion 21a 'is engaged.

As a result, the one-touch nut according to this embodiment is screwed onto the bolt B, and for example, a panel material is provided between the head of the bolt B and the end face of the cylindrical body 10 on the opening 11a side. These can be assembled by sandwiching P and P '.

In this embodiment, the outer surface 21d of the female screw member 20 is inclined along the inclination of the inclined surface 15a of the insertion hole 11 so that the female screw member 2 in the insertion hole 11 is inclined.
The movement of 0 is performed smoothly.

The screwed state of the bolt B and the one-touch nut thus screwed is released so that the rod of the bolt B comes out of the cylindrical body 10 so that the rod of the bolt B comes off.
0, the male screw B 'of the bolt B is unscrewed from the female screw portion 21a' of the female screw member 20, and the female screw member 20 is connected to each divided piece. 21 ...
21 on both sides of the center divided piece 21, 2
1 is inserted into the insertion hole 11 of the tubular main body 10.
The female screw member 20 is also rotated with the rotation of the cylindrical main body 10, so that the engagement with the bolt B is reliably released. .

In this embodiment, the cylindrical body 10 constituting the one-touch nut is made of plastic, and the bottom cover 12 is also provided integrally with the cylindrical body 10 via the hinge portion 13. There is a feature that a one-touch nut having the above function can be constituted by the two parts of the female screw member 20 and the cylindrical main body 10 that can be formed.

However, separately from the above embodiment, the bottom cover 12
After the female screw member 20 is housed in the insertion hole 11 of the cylindrical main body 10 and the bottom lid 12 is fitted into the opening 11b of the cylindrical main body 10, the bottom lid 12 is fitted, or A one-touch nut may be formed by bonding or welding.

The cylindrical body 10 may be made of a metal material. In this case, the bottom cover 12 is assembled to the cylindrical body 10 by an appropriate hinge, or is separated from the cylindrical body 10. And a one-touch nut may be formed by fitting it into the opening 11b of the tubular main body 10 and attaching it by bonding, welding, or the like.

[0054]

According to the one-touch nut according to the present invention, when the bolt B is inserted into the insertion hole 11 of the cylindrical main body 10, each of the divided pieces 21 constituting the female screw member 20 is changed to the elastic piece 2.
1c, the distance between the female screw portions 21a 'of each of the divided pieces 21 is increased while moving the inner side of the insertion hole 11 so that the cylindrical body 10 is particularly moved with respect to the bolt B to be inserted. The rod portion of the bolt B can be inserted into the insertion hole 11 without being rotated, and after that, the insertion of the bolt B into the insertion hole 11 is stopped, so that each of the divided pieces 21 is resilient piece 21c. Is moved again to the insertion entrance side of the insertion hole 11 by the urging of the insertion hole 11 and the gap between the female screw portions 21a 'is reduced by the narrow insertion hole side wall wall. The female screw portion 21a 'is screwed into the male screw B' of the inserted bolt B so that the nut B can be screwed with the one-touch operation. Or bolts B in hard-to-reach places It has the feature that the screwing work can be performed very easily.

The screwing of the bolt B is released by rotating the tubular main body 10 so as to disengage the male screw B 'of the inserted bolt B from the female screw. Each of the divided pieces 21 having female threads is connected to the hinge 2
1b, the spacing between the divided pieces 21 is not dull with the rotation of the cylindrical main body 10, the spacing can always be kept constant, and the divided pieces 21 are formed on the respective divided pieces 21. The engagement between the female screw and the inserted bolt B with the male screw B 'is always appropriately secured, so that there is no problem in releasing the screw.

Further, a one-touch nut having the above function can be constituted by the two parts of the cylindrical main body 10 and the female screw member 20 which is made of plastic and can be integrally formed. Has the following features.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a one-touch nut.

FIG. 2 is a plan view of the cylindrical main body 10.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 2;

FIG. 5 is a side view of the cylindrical main body 10.

FIG. 6 is a side view of the cylindrical main body 10.

FIG. 7 is a side view of the female screw member 20;

FIG. 8 is a plan view of the female screw member 20;

FIG. 9 is a side view of the female screw member 20;

FIG. 10 is a sectional view taken along line CC in FIG. 11;

FIG. 11 is a partially broken plan view showing a use state.

FIG. 12 is a sectional view taken along line DD in FIG.

FIG. 13 is a partially broken plan view showing a use state.

FIG. 14 is a sectional view showing a use state.

FIG. 15 is an exploded perspective view showing a conventional nut.

FIG. 16 is a side sectional view showing a conventional nut using state.

FIG. 17 is a side sectional view showing a conventional nut using state.

FIG. 18 is a side sectional view showing a conventional nut using state.

[Explanation of symbols]

 B Bolt B 'Male screw 10 Cylindrical body 11 Insertion hole 12 Inclined surface 15 Hole wall 20 Female screw member 20' Female screw 21 Split piece 21a 'Female screw part 21b Hinge part 21c Elastic piece

Claims (1)

(57) [Claims] 1. A cylindrical body having a bolt insertion hole, and a plastic female screw member provided in the insertion hole and having a female screw screwed into a male screw of the inserted bolt. A nut, wherein the insertion hole of the bolt of the cylindrical main body, the whole or a part of the hole wall, toward the back side from the insertion entrance side of the bolt,
The insertion hole has an inclined surface for gradually increasing the diameter of the insertion hole, and the female screw member includes a plurality of divided pieces connected via a thin hinge portion, and inside the divided pieces, A female screw portion which is rounded by the hinge portion and constitutes a female screw of the female screw member is provided, and the female screw member is in contact with the cylindrical main body, and An elastic piece that is constantly biased toward the insertion inlet side of the cylindrical main body, wherein the divided piece of the female screw member housed in the insertion hole of the cylindrical main body is inserted against the bias. A one-touch nut, wherein the distance between the female threads of each divided piece is increased as the hole is moved to the back side of the hole.