JP2633038B2 - Nut structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention arranges a plurality of nuts having notches which can be inserted into and removed from a bolt in the radial direction in the axial direction thereof, and rotates the nuts relative to each other. The present invention relates to a freely connected nut structure.

[Conventional technology]

Conventionally, as this kind of nut structure, there has been a structure in which a female screw portion for screwing to a bolt is formed at the bottom of a cutout portion of the nut (Japanese Patent Application Laid-Open No. 63-293314).

That is, since the plurality of nuts are connected to each other in a rotatable manner in a state of being coaxially arranged, they can be integrally assembled to the bolt. With the notch formed in one direction, insert the notch radially into the middle part in the longitudinal direction of the bolt and rotate each nut relatively, the notch formed in each nut To turn in different directions,
The detachment of the bolt and the nut was prevented, and at the same time, all the nuts were screwed into the bolt, so that the adjacent nuts could be tightened to prevent loosening.

[Problems to be solved by the invention]

However, according to the above-described prior art, the tightening force of the adjacent nuts in the locking state is based on the frictional force between the screw surfaces of the bolt and the nut. Due to the influence, the tightening force is not always uniform, and in some cases, there is a possibility that a sufficient tightening force does not work and loosening occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and realizes a nut structure that can be securely inserted into an arbitrary portion of a bolt while securely tightening the bolt in a locking state.

[Means for solving the problem]

In order to achieve this object, the nut structure according to the present invention is characterized in that a plate-like body for locking the bolt is provided at the bottom of each of the notches, and a thickness of a locking portion of the plate-like body with respect to the bolt is provided. The thickness of the bolt is equal to or less than the pitch of the bolt, the posture of the locking portion is set to an angle that intersects with the crest of the bolt, and the crest of the locking portion intersects with the crest relative to the crest. And a notch is formed so as to be freely engagable, and the locking portion is arranged such that a distance L between the locking portion and the rotation axis of the nut is smaller than a radius R of a peak portion of the bolt. It is in.

 The nut and the plate may be integrally formed.

 The nut and the plate may be formed separately.

It is preferable that the locking portion is arranged such that the distance L is smaller than a radius R 'of a valley portion of the bolt.

(Operation)

That is, the posture of the locking portion with respect to the bolt of the plate-shaped body provided at the bottom of each nut notch portion is set to an angle that intersects the peak portion of the bolt, and the position of the locking portion and the rotation axis of the nut is Since the distance L is smaller than the radius R of the ridge of the bolt, when the nut is inserted into the bolt from the notch, the locking portion comes into contact with the ridge of the screw of the bolt. The rotation axis of the nut is shifted toward the insertion portion of the nut with respect to the axis of the bolt.

When each nut is relatively rotated from that state, the notch formed in the locking portion engages with the peak of the bolt with the rotation, and the rotation axis of the nut coincides with the axis of the bolt. Thus, the nut and the bolt move relative to each other.

As a result, the notch portion of the locking portion sandwiches the ridge of the bolt, and the locking portion comes into frictional contact with the slope of the thread of the bolt, so that the nuts can be completely tightened in the locking state. is there.

Further, when the distance L between the locking portion and the rotation axis of the nut is made smaller than the radius R 'of the valley portion of the bolt, the notch portion of the locking portion and the peak portion of the bolt are more firmly engaged. Therefore, the tightening force is also increased. In this case, there is no coincidence in the tightened state between the rotation axis of the nut and the axis of the bolt.

〔The invention's effect〕

Therefore, according to the nut structure of the present invention, the nut can be securely inserted into an arbitrary position of the bolt, but can be securely tightened in a state of preventing loosening.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 4, the nut structure according to the present invention includes two nuts (2) having notches (3) which can be inserted and removed in the radial direction with respect to the bolt (1). They are arranged side by side and connected to be relatively rotatable.

The connecting portion between the nuts (2) is configured such that a locking protrusion (2a) formed on each joint surface of the nuts (2) is slidably locked by a connecting member (5), The nuts (2) are prevented from moving relative to each other, and the nuts (2) are allowed to rotate relative to each other.

As shown in FIGS. 1 to 3, each of the nuts (2) has a U-shaped plan view along the inner periphery of the notch (3).
A plate-shaped body (4) made of a letter-shaped sheet metal is provided.

The inner periphery of the curved portion of the plate-like body (4) forms an arc having a radius L centered on the rotation axis of the nut, and the radius L is larger than the radius R of the peak of the bolt (1). It is set to small.

The thickness of the inner peripheral portion of the plate-like body (4) is a thickness equal to or less than the pitch of the bolt (1), and the curved portion is disposed at an angle crossing the peak of the bolt (1). A V-shaped notch (4b) is formed at a position of the curved portion that intersects with the peak of the bolt (1).

The radial play in the connection between the nuts is determined by the distance L between the locking portion (4a) and the rotation axis of the nut (2).
And a difference L-R 'between a radius R' of a valley of the bolt (1) and a relative rotation between the nuts (2) and (2) can be rotated by about 45 ° or more. I have.

To lock the nut (2) to the bolt (1), first, the notch (3) of each nut (2) is oriented in one direction, and the notch (3) is connected to the bolt (1). At its intermediate portion in the longitudinal direction, in the radial direction.

Next, the nuts (2) adjacent to each other along the longitudinal direction of the bolt (1) are relatively rotated.

As a result, the V-shaped notch (4b) formed in the curved portion engages with the ridge of the bolt, and further, by rotating the nut (2), the periphery of the notch (4b) is The frictional contact with the slopes of the hills exerts a clamping force.

That is, the inner peripheral portion of the plate-like body (4) is a bolt (1).
(4a).

Regardless of the relative rotation direction of the nut (2), which is the left or right direction, the fastening force by the locking portion (4a) works.

Furthermore, as shown in FIG. 3, when the nut (2) is rotated in a direction away from each other in the axial direction of the bolt (1), the engaging projection (2a) of the nut (2) is connected to the coupling projection (2a). When the friction force acting between the member (5) and the member (5) is rotated in a direction approaching each other, the locking projection (2a) of the nut (2)
The frictional force acting therebetween cooperates with the tightening force of the locking portion (4a) to tighten the lock in the state of preventing loosening.

Since the plate-like body (4) is made of an elastically deformable material, the notch (4b) is formed by the bolt (1).
Is clamped from both slopes in an elastically deformed state, and the locking force is increased.

(Another embodiment)

 Another embodiment will be described below.

1. In the above embodiment, the plate-like body as the locking member for the bolt is provided separately from the nut, but the plate-like body may be integrally formed with the nut.

2. In the above embodiment, the thickness of the inner peripheral portion of the plate-like body, that is, the thickness of the locking portion is set to be equal to or less than the pitch of the bolt, but the thickness equal to or less than the pitch of the bolt over the entire plate-like body. You may set it.

3. In the above embodiment, the shape of the notch formed in the plate-like body is V-shaped. It may be shaped.

4. In the above embodiment, the posture of the plate is set to intersect with one of the peaks of the bolt, but the posture of the plate intersects with one or more peaks. It may be set as desired. In this case, a similar effect can be obtained by providing a notch portion with which each crossing portion is engaged in the plate-like body.

Further, the crossing angle of the plate-like body with respect to the peak of the bolt is arbitrary, and as shown in FIGS. 5 and 6, even if the angle is larger than the lead angle (α), it is smaller. Is also good.

5. In the above embodiment, the radius L of the inner circumference of the curved portion of the plate is set smaller than the radius R of the peak portion of the bolt.
Is set smaller than the radius R 'of the valley of the bolt, the degree of engagement between the notch formed in the plate-like body and the peak of the bolt can be increased, and the tightening force can be increased.

6. In the above embodiment, a plate-shaped body made of a U-shaped sheet metal is provided along the cutout portion of the nut, but the plate-shaped body is not limited to this shape. As shown in FIG. 7, the shape may be a U-shape.

Further, as shown in FIGS. 8 and 9, a plate-shaped body may be provided only at the bottom of the cutout portion of the nut.

7. In the above embodiment and the other embodiments 1 to 6, a single plate-like body is provided for the nut, but a plurality of plate-like bodies may be provided for the nut. In that case, the locking force on the bolt is increased accordingly.

8. In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of a nut structure according to the present invention. FIG. 1 is a plan view of the nut, FIG. 2 is a front view of the same, FIG. 3 is a front view showing a state of inserting the nut into a bolt, and FIG. FIG. 5 is an exploded perspective view of the nut, FIG. 5 is a front view of the main part, FIGS. 6 to 9 show another embodiment, FIG. 6 is a front view of the main part, and FIG.
FIGS. 8, 8 and 9 are plan views of the main parts. (1) Bolt, (2) Nut, (3) Notch, (4) Plate, (4a) Locking part, (4b)
… Notch.

Claims (4)

(57) [Claims] 1. A plurality of nuts (2) having notches (3) which can be inserted and removed in a radial direction in a bolt (1) are arranged in the axial direction thereof, and the nuts (2) are relatively rotatable. A plate-like body (4) for locking the bolt (1) at the bottom of each of the cutouts (3); (i) the plate-like body (4) The thickness of the locking portion (4a) with respect to the bolt is set to be equal to or less than the pitch of the bolt, and (ii) the posture of the locking portion (4a) is set to an angle that intersects with the peak of the bolt (1). (Iii) a notch (4b) is formed at the intersection of the locking portion (4a) with the peak, the bite being free to engage with the peak, and (iv) the locking portion (4a). The locking portion (4a) is arranged such that a distance L between the nut and the rotation axis of the nut (2) is smaller than a radius R of a peak portion of the bolt (1). Capital structure. 2. The nut structure according to claim 1, wherein said nut (2) and said plate-like body (4) are integrally formed. 3. The nut structure according to claim 1, wherein said nut (2) and said plate-like body (4) are formed separately. 4. The distance L is a radius R 'of a valley of the bolt.
2. The nut structure according to claim 1, wherein the locking portion (4a) is arranged to be smaller.