JP2010151247A - Nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a nut which can shorten the total length in the fastening member including a bolt and the nut in each apparatus, wherein the nut is fastened by a predetermined torque not in the bolt side but in the nut side and efficiently fastened without using a special tool. <P>SOLUTION: A nut for fastening keeps the nut body part and the fastening head part composed via the thin neck part integrally fracturing by the predetermined fastening torque, wherein the nut body show a cross sectional polygon or a cross sectional circular shape and is provided with a screwing hole for introducing a bolt member from the one end part freed from one side and for fixing and the thin neck figures "The fastening nut head parter-thin neck part-fastening head part" are built as if passing through the body inside. Also, through-hole the nut main partner "the fastening nut head partner-thin neck part-fastening head part" is provided and the bolt member are composed as if the nut main part is full of penetrability. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nut that is used together with a bolt to tighten or fasten a member, and more particularly to a nut that enables tightening management.

  Bolts and nuts are generally used to tighten and fasten various equipment members. The bolts are often tightened manually by an operator using a bolt turning (tightening) tool such as a wrench or a spanner and tightened with a constant torque. At that time, since the torque is not constant if it is tightened depending on the operator's control and feeling, in order to always be tightened with a constant torque without being affected by the operator, A reduced-diameter neck that breaks when the tightening torque exceeds a certain value is set between the tip heads, and a tightening tool for turning the bolt is fitted to the tip head. A so-called “breakaway bolt” is known in which the reduced-diameter neck portion breaks to prevent further tightening torque from reaching the bolt side (see FIG. 6).

When tightening various members, when using a combination of bolts and nuts, it is common to tighten the bolt head with a tightening tool such as a wrench or spanner. Use a special tool such as a wrench or use the above breakaway bolt. FIG. 5 is an external perspective view showing a conventionally used breakaway bolt tightening tool.
In tightening parts, it is not normally assumed that the nut side is tightened with a constant torque. However, when tightening the nut, a special tool such as a torque wrench must also be used to manage the tightening. Don't be.

And in the tightening member including the bolt and the nut, there are cases where it is more advantageous to tighten the nut than the bolt depending on the tightening structure, working method, work site, etc. In such cases, the nut side is tightened, but there is no supply on the market that the nut side can be tightened with a constant torque.
Further, there is no means or method for efficiently tightening a nut that can be tightened with such a constant torque using a general tightening tool instead of a special tool.

Patent documents related to the present invention include, for example, the following.
Japanese Utility Model Publication No. 01-6727 (Furukawa Electric) Japanese Utility Model Publication No. 53-26769 (Doi Seisakusho)

  The present invention has been made in view of the problems associated with conventional nuts, and in a tightening member including bolts and nuts of members of various devices, the nut side is fixed rather than tightening the bolt side as in the past. Providing a nut that can be tightened with a torque of, and providing a structure for efficiently tightening such a nut without the use of a special tool and the means for forming the nut, and the length of such a nut An object of the present invention is to provide a nut having a structure capable of shortening the overall length in the tightening direction.

(1) The nut main body and the tightening head are nuts for tightening configured integrally with a narrow neck portion that is broken at a predetermined tightening torque,
The nut main body portion has a cylindrical shape with a polygonal cross section or a circular cross section, and includes a loose screw hole that introduces a bolt member from one open end and is screwed with the bolt member.
The narrow neck is erected on the top surface of the closed other end of the nut body,
"Nut body-narrow neck-tightening head" is integrally formed on the axis of the screw hole,
Continuing to the screw hole in the nut main body, a through hole is provided to pass through the inside of the "nut main body-narrow neck-tightening head" or "narrow neck-tightening head".
The bolt member is configured to be able to pass through the nut main body.

(2) In the nut of (1),
When attaching and tightening a predetermined tightening tool to the tightening head,
A tool position setting portion for restricting the mounting position of the tightening tool is disposed so as to protrude from the outer peripheral surface of the tightening head in a direction intersecting the axis at a position near the nut body.
(3) In the nut of (2),
The tool position setting unit is configured in an annular shape or a ring shape including a notch.

  The nut according to the present invention can provide a nut capable of tightening the nut side with a constant torque in a tightening member including bolts and nuts of various devices, and is constant without using a special tool such as a torque wrench. It is possible to perform tightening with a sufficient torque, and an easy and efficient tightening operation can be performed by the tool position setting unit for regulating the mounting position of the tightening tool.

  In addition, the nut according to the present invention has a configuration in which a bolt to be screwed and inserted passes through the inside of the nut, and if the nut body has a through hole, the bolt end portion is in the through hole after the head breaks. It can be stored (stored) or can be protruded from the through hole, and even if there is no through hole in the nut body, it can be protruded from the through hole after the head is broken. A structure in which the dimension in the tightening direction is low (short) can be obtained.

Therefore, the nut according to the present invention can be designed as a compact product with good appearance without protruding the nut member after being tightened and broken, and can contribute to saving of material.
Furthermore, even when it is necessary to fix the bolt and the nut so as not to be detached, the nut structure according to the present invention enables the nut to be fixed by being deformed by caulking.

Embodiments of a “nut” according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a view for explaining the structure of a “nut N10” according to an embodiment of the nut according to the present invention, and the tool position setting unit here includes an “E-shaped retaining ring”.
FIG. 2 is a view for explaining the structure of a “nut N20” according to an embodiment of the nut according to the present invention, and the tool position setting section here includes “an annular flange by plastic working”.
FIG. 3 is a view for explaining the structure of a “nut N30” according to an embodiment of the nut according to the present invention, and the tool position setting unit here includes a “C-shaped retaining ring”.
FIG. 4 shows an example when the “nut N20” according to the present invention is applied to a damper for preventing electric wire vibration.
FIG. 5 is an external perspective view showing an example of a tightening tool used in the present invention.

  The nut of FIG. 1 has a “nut N10 for tightening, which is configured integrally with a nut main body 11 and a head for tightening 13 via a narrow neck (reduced neck) 12 that is broken at a predetermined tightening torque. The nut main body 11 has a cylindrical shape with a hexagonal cross section, and has a loose screw hole n1 for introducing a bolt member upward from one end t1 opened downward and screwing it into the screw hole n1. A narrow neck 12 is erected on the top surface of the upper outer surface of the nut main body 11 on the other end t2 side, and “head 13 for tightening—narrow neck 12—nut main body 11” is screwed from above to below. It is integrally formed concentrically with the shaft center g1 of the hole n1. The narrow neck portion (reduced diameter neck portion) 12 here has a three-dimensional shape with a tapered cross section as a whole, and has a structure that breaks with a predetermined tightening torque at the narrowest portion.

In the nut N10, a screw hole n1 is provided on the shaft center g1 from the bottom to the top in the nut main body 11, and the nut N10 is continuous with the screw hole n1 as “nut main body 11-narrow neck 12”. -A through hole k1 is provided through the inside (through) of the tightening head 13 "and opened in the upper surface 13a of the tightening head 13.
As shown in FIG. 1 [sectional view AA], the through-hole k1 has a cylindrical cross-sectional shape centered on the axis g1, and its diameter d2 is set larger than the diameter d1 of the screw hole n1. .

  Then, as shown in FIG. 1 [bolt screwing diagram], the bolt member B1 is screwed from below into the screw hole n1 of the nut main body 11 of the nut N10, and proceeds upward. When the end portion bt1 of B1 penetrates through the screw hole n1, the portion of the end portion bt1 of the bolt member B1 can be accommodated (stored) in the through hole k1.

  Further, the tightening head 13 of the nut N10 has the same external shape as that of a general nut having a hexagonal cross section, but a predetermined tightening tool (for example, the tool 50 in FIG. 6) is attached to the tightening head 13. When mounting and tightening, a tool position setting portion S1 for restricting the mounting position (corner position) of the tightening tool 50 is provided near the nut body 11 of the tightening head 13.

A tightening tool 50 shown in FIG. 5 is used for covering and tightening the tightening head 13 of the nut N10. The tightening tool 50 has a box portion 51 and a cross section in accordance with the tightening head 13 therein. A hexagonal three-dimensional fastening part 52 is provided, and the fastening part 52 has a depth of f1.
However, since the depth f1 of the tightening tool 50 is not designed to be equal to the height of the nut to be tightened, when the tightening tool 50 is applied to the nut N10, it passes through the thickness of the head 13 for tightening. In this case, there is a risk that the nut body 11 may be reached and abut against the nut body 11 or be tightened. In such a case, there is a problem that it is impossible to tighten with a constant torque.

  For this reason, a tool position setting portion S1 is provided in the tightening head 13 of the nut N10, and when a tool such as a wrench or a spanner is fitted and tightened in the nut-shaped tightening head 13, the tightening portion of the tightening tool 50 is provided. 52, the tightening head 13 does not move to the back of the interior, but is locked by the tool position setting portion S1 so that it cannot be advanced. By this tool position setting portion S1, the nut N10 can be easily tightened. Thus, the torque management can be reliably performed.

In the tool position setting section S1 of the nut N10, the counterboring position of the tightening section 52 of the tightening tool 50 is set in the direction intersecting with the axis g1 from the outer peripheral surface of the tightening head 13 and here in the direction perpendicular to the axis g1. For this reason, an E-shaped retaining ring 14 having a ring shape with an E-shaped stepped surface is provided protruding in a circumferential shape.
In disposing the E-shaped retaining ring 14 in the tool position setting portion S1, the outer periphery of the tightening head 13 of the nut N10 is dug inward, and an annular shape matched to the shape of the E-shaped retaining ring 14 is obtained. A ring groove m1 is formed and fitted into the E-shaped retaining ring 14 therein.
The ring groove m1 may be formed by forming an annular groove on the outer periphery of the tightening head 13 having a hexagonal cross section by machining or the like. The lower portion 13a remains the hexagonal cross section of the original nut.

  In producing the nut N10, it is preferable that the nut N10 is made from a square three-dimensional or cylindrical material such as aluminum, copper, or steel by machining such as cutting. After processing into the shape of the main body portion 11 "and making the portion of the tightening head 12 a hexagonal nut shape, the ring groove m1 can be cut out thereafter.

  As shown in [Figure of E-type retaining ring] in FIG. 1, the E-shaped retaining ring 14 of the nut N10 is inserted into the ring groove m1 of the tightening head 13 so as to be formed on the inner circumference m1 ′ of the ring groove m1. In order to make the E-shaped retaining ring 14 flexible and easy to insert by having an opening 14 ′ having a size (width) matched to the diameter, and two space portions (b1, b2), Protrusions (a1, a2, a3) that come into contact with the inner periphery m1 ′ are provided, and the protrusions (a1, a2, a3) form the letter “E”.

Referring to [Bolt screwing diagram] in FIG. 1, the nut N10 according to the present invention is composed of a combination of “a nut main body part 11, a narrow neck part 12 and a fastening head part 13”, and the heights (dimensions) of the three members. Is “h1, h2, h3”, the height (dimension) H1 of the nut N10 has a relationship of “H1 = h1 + h2 + h3”.
Here, the screw hole n1 penetrates from the downward opening end t1 of the nut main body 11 to the upper portion of the nut main body 11, and has “m1” as the depth (dimension) of the screw hole n1. Further, a through hole k1 is provided continuously to the screw hole n1, and the through hole k1 passes from the nut main body part 11 through the narrow neck part 12 to the upward opening end part 13a of the tightening head part 13. The through hole k1 has “m2” as the depth (dimension) of the through hole k1, and the height (dimension) H1 of the nut N10 has a relationship of “H1 = m1 + m2.”

In the [bolt screw diagram] in FIG. 1, the depth (dimension) m1 of the screw hole n1 is set smaller than the height (dimension) h1 of the nut body 11 (m1 <h1), and therefore the through hole k1. Has a structure that penetrates through the inside of the “nut main body 11—the narrow neck 12—the tightening head 13” continuously to the screw hole n1.
Further, the depth (dimension) m1 of the screw hole n1 can be set to be equal to the height (dimension) h1 of the nut body 11 at the maximum (m1 = h1). Has a structure that penetrates the inside of the “narrow neck portion 12-the tightening head portion 13” continuously to the screw hole.

  The nut N10 according to the present invention is a type (through type) in which a through hole k1 is provided subsequent to the screw hole n1 and penetrates the inside of the nut N10. The bolt end can be accommodated (stored) in the through-hole later or can be protruded from the through-hole, and can be protruded from the through-hole after the head breaks even if the nut main body has no through-hole. Therefore, the overall length of the nut main body 11 remaining after the fracture of the narrow neck portion 12 can be suppressed and shortened, and as a result, the overall length of the nut N10 can also be suppressed.

The through hole k1 and the screw hole n1 of the nut N10 are different in diameter because the diameter d2 of the through hole k1 is set larger than the diameter d1 of the screw hole n1 as shown in FIG. 1 [sectional view AA]. A step d0 is generated at the boundary between the through hole k1 and the screw hole n1.
As shown in FIG. 1 [bolt screw diagram], when the bolt member B1 is inserted upward, the outer peripheral portion of the end portion bt1 of the bolt member B1 and the inner wall portion of the through hole k1 due to the step difference d0 due to the difference in diameter. A space k1s is generated between

In the nut N10 having such a structure, after the “narrow neck portion 12—the tightening head portion 13” is removed by breaking the narrow neck portion 12, the nut main body portion 11 around the space k1s is deformed to the inside of the space k1s. The end bt1 of the bolt member B1 can be fixed by the method.
FIG. 1 [fixed end view] shows that after the bolt member B1 is screwed together, the bolt member B1 and The state which fixed the nut main-body part 11 is shown, and it is possible to form the structure where the nut main-body part 11 does not remove | deviate from bolt member B1.

  The nut N10 shown in FIG. 1 of the present invention has a hexagonal cross section provided on the outer periphery of the nut body 11 when it is desired to loosen and remove the narrow neck 12 after it has been broken and tightened. Although it has a structure that can be removed by rotating it in the loosening direction, as described above, if the bolt member B1 and the nut body 11 are fixed by the deforming portion 11h, it cannot be loosened. Removal becomes impossible.

The nut N20 in FIG. 2 is configured integrally with a nut body portion 21 and a tightening head portion 23 via a narrow neck portion 22 that is broken by a predetermined tightening torque, and the tool position setting portion S2 of the nut N20 has a circular shape. The basic structure including the ring-shaped protrusion 24 and the threaded hole n2 and the through hole k2 through which the bolt is inserted is the same as the nut N10. 1) ”and“ C-shaped retaining ring (FIG. 3) ”are different.
Here, the nut N20 is made of a single-piece material of the tightening head 23 with the flange 24, the narrow neck 22 and the nut body 21, and the ring-shaped flange 24 is manufactured by plastic working. Has been.

The nut N30 in FIG. 3 is configured integrally with a nut main body 31 and a tightening head 32 via a narrow neck portion 33 that is broken by a predetermined tightening torque, and the tool position setting portion S3 of the nut N30 includes C Although having a retaining ring 34 and having the same basic structure as the nut N10, the structure of the "C-shaped retaining ring 34" provided in the nut N30 is the "E-shaped retaining ring" of the nut N10 in FIG. Is different.
This C-shaped retaining ring 34 is an O-shaped ring body as a whole, and is made of an elastic material that can be opened and closed at the opening 34 ', and has left and right opening ends (a1, a2) of the opening 34'. By being positioned up and down, the opening 34 'can be greatly opened in the vertical direction, and can be easily fitted into the circumferential groove m3.

In the “nuts N10 to N30” according to the present invention, the “nut main body portion + narrow neck portion + tightening head portion” is generally made of aluminum, steel material, copper material, etc. Part ”and“ narrow neck part + tightening head part ”can be manufactured separately, and the narrow neck part 43 can be fitted into the nut body part 41 and integrated.
These “nuts N10 to N30” are tightened with the tightening head, and after the tightening is completed, the narrow neck portion is threaded, and the “narrow neck portion + tightening head” disappears. Only the main body is attached, and the end of the bolt member is exposed or seen inside.

Therefore, as shown in FIGS. 1 to 3, if the outer shape of the nut body is the same as that of the nut having a hexagonal cross section, when the nut is to be removed, the nut body is loosened with a general tool. be able to.
Separately, if the outer shape of the nut body is made cylindrical or smooth without corners, the nut body does not have corners to rotate when you want to remove it. It cannot be loosened with a tool. Therefore, the structure of the nut that cannot be loosened can be used as the “loosening prevention structure”.

  FIG. 4 shows an example when the “nut N20” according to the present invention is applied to a damper for preventing vibration of an overhead electric wire. The damper 40 includes a clamp C1 and a clamp C2, weights (weights) W1 and W2, a damper wire DW, an eyebolt IV, and a nut N20 (breakaway aluminat). The weights W1 and W2 are clamped by the damper wire DW. The clamp C1 clamps the overhead electric wire DS in cooperation with the "clamp C2-eyebolt IV-nut N20", and the damper 40 is connected to the overhead electric wire DS stretched on a steel tower or the like on the vertical surface. Are attached at a predetermined angle α.

  In this damper 40, an eyebolt IV and a nut N20 are used to hold the clamp C1 and the clamp C2, but the eyebolt IV itself does not have a tightening portion, and the head of the nut N20 is tightened to make it aerial. It is structured to be attached to the electric wire. Further, since the installation work of the damper 40 is performed in an unstable and dangerous place on an overhead line, the “breaker type nut” as in the present invention has such a damper structure and a special type. It is extremely suitable for use in tightening operations at the installation site.

It is a figure which shows the structure of the "nut N10" concerning 1st Embodiment of the nut by this invention, The tool position setting part here is provided with the "E-shaped retaining ring." It is a figure which shows the structure of the "nut N20" concerning 2nd Embodiment of the nut by this invention, The tool position setting part here is provided with the "ring-projection shaped collar part by plastic working". It is a figure which shows the structure of the "nut N30" concerning 3rd one Embodiment of the nut by this invention, The tool position setting part here is provided with the "C-type retaining ring." It is a figure which shows the example when applying the "nut N20" by this invention to the damper for electric wire vibration prevention. It is a figure which shows an example of the clamping tool used for this invention. It is a figure which shows the example of the fastening bolt of the conventional breaker system.

Explanation of symbols

N10, N20, N30 Nut 11, 21, 31 Nut body part 12, 22, 23 Narrow neck part 13, 23, 33 Head for tightening S1, S2, S3 Tool position setting part 14 E-shaped retaining ring 24 Ring Protruding collar 34 C-shaped retaining ring n1, n2 Screw hole k1, k2 Through hole g1 Axis center

Claims (3)

The nut main body and the tightening head are nuts for tightening configured integrally through a narrow neck portion that breaks at a predetermined tightening torque,
The nut main body portion has a cylindrical shape with a polygonal cross section or a circular cross section, and includes a loose screw hole that introduces a bolt member from one open end and is screwed with the bolt member.
The narrow neck is erected on the top surface of the closed other end of the nut body,
"Nut body-narrow neck-tightening head" is integrally formed on the axis of the screw hole,
Continuing to the screw hole in the nut main body, a through hole is provided to pass through the inside of the "nut main body-narrow neck-tightening head" or "narrow neck-tightening head".
A nut configured to allow the bolt member to pass through the nut body. The nut according to claim 1,
When attaching and tightening a predetermined tightening tool to the tightening head,
A tool position setting portion for restricting the mounting position of the tightening tool is provided so as to protrude from the outer peripheral surface of the tightening head in a direction intersecting the axis at a position near the nut body. Nut featuring. The nut according to claim 2,
The said tool position setting part is comprised as an annular shape or a ring shape containing a notch, The nut characterized by the above-mentioned.

Images