JP2006064031A - Nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut immediately fastened from a position where it is linearly moved so as to insert an object to be screwed and fitted without causing lengthiness of the object to be screwed and fitted, and easily disengaged. <P>SOLUTION: In the first mode having a relative relation allowing an outer ring 1 to freely rotate against a C-shape inner ring 2, when the C-shape inner ring 2 is fitted around the object A to be screwed and fitted and linearly advanced, a projection forming part 12 composed by spirally forming a projection 12a on the inner surface of the C-shape inner ring 2 is brought into contact with a spiral projection (a) formed on the peripheral surface of the object A to be screwed and fitted, however, the C-shape inner ring 2 is radially enlarged by a clearance C retained between the outer ring 1 and the inner ring, and the linear advance of the nut N to a fastening start position against the object A to be screwed and fitted is not prevented. When the outer ring 1 is rotated at a required angle or more allowing the C-shape inner ring 2 to freely rotate from the fastening start position, the inner ring 2 is locked with the outer ring 1 and rotated together, and also fastened by changing to the second mode having no clearance to prevent the deformation of the radial enlargement of the inner ring 2 between the inner ring 2 and the outer ring 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nut, and more particularly to a nut that can be tightened by a rotational operation from an intermediate position with respect to a screw-fitting target portion, and has excellent handleability for shortening a tightening operation and a tightening time.

Conventionally, nuts having the structure shown in FIG. 4 are known.
In this prior art, a concave portion 3 having a gradient that expands in the direction opposite to the tightening side is provided at a plurality of locations in the circumferential direction inside the nut body n, and a female screw 14 is screwed into the concave portion 3 having the gradient. An elastic machine in which a screw member 4 is loosely fitted, a bullet intervening space 5 is formed in communication with the sloped concave portion 3, and the screw member 4 is biased in the tightening direction in the bullet interposing space 5. 6, the end surface 24 on the tightening side of the screw member 4 is configured to abut against the concave end surface 13 of the concave portion 3 with a gradient by receiving the biasing force of the bullet mechanics 6.

In the prior art, when the nut N is externally fitted and linearly moved so that the screw fitting target portion A is inserted, the screw member 4 is formed on the spiral protrusion a formed on the outer peripheral surface of the screw fitting target portion A. While the female screw 14 is abutted and the screw member 4 compresses the bullet machine 6, the screw member 4 descends obliquely backward in the bullet machine interposing space 5 together with the sloped recess 3, and is a straight line with respect to the screw fitting target part A of the nut N. Tightening can be performed by a rotation operation after the nut N is advanced to an arbitrary position of the screw fitting target portion A without hindering the movement.
Therefore, the nut N is linearly advanced with respect to the screw fitting target portion A to the position necessary for tightening without performing screw fitting from the start end of the screw fitting target portion A to the helical protrusion a. Tightening can be performed by rotating operation from there.
However, because the nut N is fitted so that the screw fitting target portion A is inserted and moved linearly, the concave portion 3 having a slope for releasing the screw member 4 that collides with the nut N and the ammunition interposing space 5 communicating therewith are provided. The overall height of the nut N is increased by the sloped concave portion 3 and the munitions intervening space 5, so that the effective screw portion needs to be long and long as the screw fitting target portion A.
In particular, after tightening the target portion A to be screwed with a nut N, an end portion of the target portion A is screwed with a nut for connecting another member to the end portion. In the case where the screw is inserted into a desired location and connected, the effective screw portion of the screw fitting target portion A becomes very long.
In addition, once removed after tightening for maintenance management or the like, it must be reversely rotated to the beginning of the effective screw portion of the screw fitting target portion, which is very troublesome.
Moreover, when the nut N is linearly advanced to the required position with respect to the screw fitting target portion A and the rotation operation is performed from that position, the female screw 14 of the screw member 4 as shown in FIG. 4, the end surface 24 on the tightening side of the screw member 4 has a sloped recess 3 as shown in FIG. 4C. Unless the nut N is rotated several times until it comes into contact with the concave end surface 13, the tightening cannot be performed and it is difficult to say that the tightening efficiency is never good.
The existence of the prior art documents relating to the nut described above is unknown to the applicant.

  The present invention has been made in view of the above-described conventional circumstances, and the intended process is to immediately start from the position where the screw fitting target portion is linearly moved so that the screw fitting target portion is not elongated. The object is to provide a nut that can be tightened and easily removed.

The technical means taken in order to solve the above-mentioned problem includes an annular outer ring, and a C-shaped inner ring which is disposed in the outer ring so as not to fall off and has a protrusion formed on the inner surface in a spiral shape.
A spiral protrusion formed on the outer peripheral surface of the screw fitting target portion and allowing the outer ring to freely rotate with respect to the inner ring within a range of a required rotation angle of the outer ring with the C-shaped inner ring as a center. And a first mode for ensuring clearance between the outer surface of the inner ring and the inner surface of the outer ring, and a required clearance of the inner ring. Protrusion of the inner ring with respect to the helical protrusion of the portion to be screwed together while the inner surface of the outer ring engages with the outer surface of the inner ring by rotation more than the rotation angle and rotates the inner ring with the outer ring. The inner ring outer surface and the outer ring inner surface are configured so as to be changeable to a second mode having no clearance to prevent the inner ring from expanding and deforming so as to maintain the screwed state of the portion. Nut There (claim 1).
Here, the spiral protrusion formed on the inner surface of the inner ring is not only continuous over the entire length, but also includes a discontinuous one that interrupts the middle of the screw fitting target part. To do.

According to the above means, in the first mode in which the outer ring is in a relative relationship that allows free rotation with respect to the C-shaped inner ring, the outer ring is removed so that the threaded portion is inserted. When fitted and linearly advanced, the projecting portion of the C-shaped inner ring abuts on the spiral projecting portion formed on the outer peripheral surface of the screw fitting target portion, but is secured between the outer ring and the outer ring. The C-shaped inner ring expands with the clearance, and does not hinder linear advancement to the tightening start position of the nut with respect to the screw fitting target portion.
When the outer ring is rotated by more than the required angle allowing the C-shaped inner ring to rotate from the tightening start position, the C-shaped inner ring engages with the outer ring and rotates together with the C-shaped inner ring and the outer ring. In the meantime, the inner ring is changed to the second mode without a clearance to prevent the inner ring from deforming and tightened.
Further, the outer ring is changed to the first mode that allows free rotation with respect to the C-shaped inner ring, and the outer ring is receded linearly with respect to the screw fitting target portion and then extracted.

As described above, the present invention allows the outer ring to freely rotate and allows the inner ring to expand in the radial direction within the required rotation angle range of the outer ring around the C-shaped inner ring. A first mode that enables linear advancement in an externally fitted state with respect to a portion, and an inner ring that can be rotated together with the outer ring by rotating more than the required rotation angle range of the outer ring. The inner ring can be changed to the second mode in which the diameter cannot be increased.
Therefore, by setting a required rotation angle that allows the outer ring to rotate with respect to the inner ring as small as 30 degrees or 45 degrees, for example, linearly to a necessary position with respect to the screw fitting target portion. It can be tightened immediately after moving forward.
Accordingly, when the screw member is engaged linearly forward to the required position with respect to the screw fitting target portion as in the prior art, the screw member does not return even if it receives the repulsive force of the ammunition, and the nut for that distance. As compared with the prior art in which tightening is started after several rotations of the shaft, the tightening operation can be simplified and the tightening time can be shortened.
In addition, unlike the prior art, it is not necessary to secure a sloped recess for lowering the screw member and a space for interposing the ammunition in the height direction, so that the overall height is suppressed low. For this reason, the spiral protrusion (effective screw portion) is not long and long to be screwed in, so that the screw cannot be screwed in, and the helical protrusion (effective screw portion) can be tightened regardless of the length. Excellent versatility.
In addition, by changing the outer ring to the first mode that allows free rotation with respect to the C-shaped inner ring, it is easy to remove the outer ring linearly and remove it.

  Next, an embodiment of the nut of the present invention will be described with reference to FIGS.

  In the drawings, reference numeral N denotes a nut, which is composed of two members, an outer ring 1 and a C-shaped inner ring 2, both of which are molded from a synthetic resin material.

  The outer ring 1 has an annular shape as shown in FIGS. 1 to 3, and has inner flanges 11, 11 that prevent the outer ring 1 from falling off from the open portions of the C-shaped inner ring 2 disposed inside at both edges. Is forming.

  On the other hand, as shown in FIGS. 1 to 3, the C-shaped inner ring 2 is disposed between the upper and lower inward flanges 11, 11 in the outer ring 1, and is surrounded by the inward flanges 11, 11 on the inner surface. The projecting portion 12a is provided by forming the projecting portion 12a in a spiral shape.

And the said nut N is formed in the outer peripheral surface of the screw fitting object part A while accept | permitting free rotation with respect to the inner ring 2 of the outer ring 1 in the range of a required rotation angle centering on the C-shaped inner ring 2. A clearance C is provided between the outer surface of the inner ring 2 and the inner surface of the outer ring 1 to allow the diameter-deformation deformation of the inner ring 2 due to the abutment between the spiral protrusion a and the protruding portion 12 of the inner ring 2. A first aspect of
When the outer ring 1 rotates more than the required rotation angle, the inner surface of the outer ring 1 is engaged with the outer surface of the inner ring 2 so that the inner ring 2 rotates together with the outer ring 1 and the spiral of the screw fitting target portion A Clearance that prevents the inner ring 2 from expanding and deforming between the outer surface of the inner ring 2 and the inner surface of the outer ring 1 so as to maintain the screw-fitted state of the protruding portion 12 of the inner ring 2 with respect to the protruding portion a. It is configured to be changeable to the second mode without any.

FIG. 2 shows the first mode, and FIG. 3 shows the second mode.
As shown in FIGS. 2 and 3, the outer ring 1 is formed by continuously forming a continuous inner surface portion 21 including a large-diameter inner surface portion 21a, a medium-diameter inner surface portion 21b, and a small-diameter inner surface portion 21c in the circumferential direction at intervals of 90 degrees. In each continuous inner surface portion 21, the large-diameter inner surface portion 21 a and the medium-diameter inner surface portion 21 b, the medium-diameter inner surface portion 21 b and the small-diameter inner surface portion 21 c are connected by inclined surfaces 21 e and 21 f, respectively. The large-diameter inner surface portion 21a and the small-diameter inner surface portion 21c between 21 and 21 are connected via an inwardly rising vertical surface 21g.

  On the other hand, as shown in FIGS. 2 and 3, the C-shaped inner ring 2 has a continuous outer surface portion 22 of a large-diameter outer surface portion 22a, a medium-diameter outer surface portion 22b, and a small-diameter outer surface portion 22c that are continuously spaced by 90 degrees. The large-diameter outer surface portion 22a and the small-diameter inner surface portion 22c are connected between the continuous outer surface portions 22 and 22 via an outwardly rising vertical surface 22d.

Then, as shown in FIG. 2, the outer ring 1 is centered on the C-shaped inner ring 2 from the state in which the inwardly rising vertical surface 21g of the outer ring 1 and the outwardly rising vertical surface 22d of the C-shaped inner ring 2 are engaged with each other. The inner ring between the large-diameter outer surface portion 22a of the C-shaped inner ring 2 and the opposed large-diameter inner surface portion 21a of the outer ring 1 within a rotation range in the tightening direction of a predetermined angle (about 45 degrees). The clearance C is provided between the medium-diameter outer surface portion 22b of the outer ring 1 and the medium-diameter inner surface portion 21b facing the outer ring 1, and between the small-diameter outer surface portion 22c of the inner ring 2 and the small-diameter inner surface portion 21c of the outer ring 1 facing each other. The first ring is configured such that the outer ring 1 rotates around the C-shaped inner ring 2 within the rotation range in the tightening direction of the predetermined angle (about 45 degrees). .
The clearance C allows the C-shaped inner ring 2 to be prevented from interfering with the linear advance of the nut N through the threaded portion A when the spiral protrusion a and the protrusion forming portion 12 abut. It has a function of expanding the diameter of the protrusion and allowing the protruding portion 12 to escape to the outside.

When the outer ring 1 is rotated in the tightening direction by a predetermined angle (about 45 degrees) or more as described above, the inclined surface 21f is locked to the large-diameter outer surface portion 22a of the C-shaped inner ring 2 as shown in FIG. Then, the C-shaped inner ring 2 is rotated together, and the small-diameter inner surface portion 21c of the outer ring 1 is engaged with the medium-diameter outer surface portion 22b of the C-shaped inner ring 2, and the medium-diameter inner surface portion 21b is engaged with the C-shaped inner ring 2 Is engaged with the large-diameter outer surface portion 22a, and constitutes the second mode in which a clearance for expanding and deforming the C-shaped inner ring 2 is not generated.
The slit 2 ′ of the C-shaped inner ring 2 is provided so as to eliminate one small-diameter outer surface portion 22c as shown in FIG. 2, and is in a tightening direction by a predetermined angle (about 45 degrees) or more as described above. When rotated, the inclined surface 21f is engaged with the large-diameter outer surface portion 22a of the C-shaped inner ring 2, and the small-diameter inner surface portion 21c passes through the slit 2 'and the medium-diameter outer surface portion of the C-shaped inner ring 2 No clearance is generated by engaging with 22b.

  The idling angle range does not need to be 45 degrees, and may be 30 degrees or less.

The nut N configured as described above is rotated in the state shown in FIG. 2 because the outer ring 1 can rotate freely within a predetermined angle (about 45 degrees) rotation angle range in the tightening direction. Projection forming portion formed on the inner surface of the C-shaped inner ring 2 on the spiral projection a formed on the outer peripheral surface of the screw fitting target portion A in the angle range (the portion in which the projection is formed in a spiral shape) ) When the outer ring 12 is fitted so as to abut and a linear movement force is applied, the C-shaped inner ring 2 is deformed by the shape of the inner ring 2 by utilizing the secured clearance C, and the protruding portion 12 is released. Thus, it can be linearly moved to the fastening start position with respect to the screw fitting target part A.
Then, when it is rotated by a predetermined angle (about 45 degrees) or more in the tightening direction at the tightening start position, as shown in FIG. 3, the C-shaped inner ring 2 naturally engages with the outer ring 1 and rotates together. Between the C-shaped inner ring 2 and the outer ring 1, the inner ring 2 can be tightened by changing to a form without a clearance that prevents the inner ring 2 from expanding in diameter.

Moreover, when it rotates in the direction opposite to the tightening direction so that it can be rotated with respect to the C-shaped inner ring 2, the helical protrusion a formed on the outer peripheral surface of the screw fitting target portion A again. And a clearance C that allows a diameter expansion deformation of the inner ring 2 due to an abutment between the inner ring 2 and a projection forming portion 12 formed on the inner surface of the inner ring 2 (portion in which the projection is formed in a spiral shape). Since the first mode secured between the outer surface of the ring 2 and the inner surface of the outer ring 1 is changed, the nut N can be extracted by receding linearly with respect to the screw fitting target portion A.

The first embodiment (a spiral protrusion formed on the outer peripheral surface of the screw fitting target portion and its inner ring is partially cut away in the perspective view of the nut of the present embodiment and allowed to loosen with respect to the inner ring of the outer ring. The clearance between the outer surface of the inner ring and the inner surface of the outer ring allows clearance to allow the inner ring to expand in diameter due to the abutment with the protruding portion formed on the inner surface of the inner ring (portion where the protruding portion is formed in a spiral shape). A mode secured in the meantime). The nut at the time of a 1st aspect is shown, (a) is a cross-sectional top view, (b) is the roll line sectional drawing, and a nut is advanced to a screw fitting object part linearly by external fitting (linear movement). Indicates the state. Second aspect (the inner surface of the outer ring is locked to the outer surface of the inner ring, the inner ring is rotated together with the outer ring, and the spiral protrusion formed on the outer peripheral surface of the screw fitting target portion is The inner ring is formed between the outer surface of the inner ring and the inner surface of the outer ring so as to maintain the screwed state of the projecting portion (the portion in which the projecting portion is spirally formed) formed on the inner surface of the inner ring. (A) with no clearance to prevent diameter expansion deformation) (a) is a cross-sectional plan view, (b) is a cross-sectional view of the roll line, and the nut is fastened to the threaded portion Indicates. The conventional nut is shown, (i) is a longitudinal cross-sectional view. (B) is a cross-sectional view of the main part showing a state in which the screw member does not fully return to the initial position even if it receives the repulsive force of the ammunition while being engaged with the object to be screwed, and (C) is a tightening of the screw member. Sectional drawing of the principal part which shows the state rotated several times and rotated the nut until the end surface of the attachment side contact | abutted the concave end surface of the recessed part with a gradient.

Explanation of symbols

N: Nut 1: Outer ring 2: C-shaped inner ring A: Screw fitting target part 12: Projection forming part a: Spiral projection C: Clearance 12a: Projection

Claims (1)

An annular outer ring, and a C-shaped inner ring which is arranged in the outer ring so as not to fall off and has a spiral formed on the inner surface,
A spiral protrusion formed on the outer peripheral surface of the screw fitting target portion and allowing the outer ring to freely rotate with respect to the inner ring within a range of a required rotation angle of the outer ring with the C-shaped inner ring as a center. And a first mode for ensuring clearance between the outer surface of the inner ring and the inner surface of the outer ring, and a required clearance of the inner ring. Protrusion of the inner ring with respect to the helical protrusion of the portion to be screwed together while the inner surface of the outer ring engages with the outer surface of the inner ring by rotation more than the rotation angle and rotates the inner ring with the outer ring. The inner ring outer surface and the outer ring inner surface are configured so as to be changeable to a second mode having no clearance to prevent the inner ring from expanding and deforming so as to maintain the screwed state of the portion. Nut

Images