JP2020176657A - Nut member and specialized tool - Google Patents

Abstract

To realize a nut member and a specialized tool capable of further preventing looseness to further enhance a crime prevention effect.SOLUTION: A bottom surface 21, a top surface 22 and a tapered surface 23 of a nut body 20 form a truncated cone shape. Even when the tapered surface 23 is held by a tool, the tool slips, so it is difficult to rotate the nut body 20. A protrusion 26 is formed along a circumferential direction on an outer peripheral surface 24a of a base part 24 protruding from the bottom surface 21, and an annular member 30 is rotatably fitted to the protrusion 26. The nut body 20 does not rotate even when the annular member 30 is held and rotated by the tool.SELECTED DRAWING: Figure 1

Description

The present invention relates to a nut member for fastening an object to be fastened by combining with a bolt, and a special tool required for tightening or loosening the nut member.

In recent years, theft of batteries mounted on trucks and cranes has frequently occurred. The reason why these vehicles are targeted is that the battery is exposed to the outside of the vehicle, but there is a bigger factor in the mounting structure of the battery than that. In other words, since the battery is fixed to the vehicle by a simple structure with bolts and nuts, the battery can be easily removed by loosening the nuts with a general tool such as a wrench.
In addition, due to the soaring price of metal, the nameplates and grids of buildings have been stolen. Many of these are also fixed in place by bolts and nuts, so they can be easily removed by loosening the nuts with a general tool such as a wrench.
Therefore, the inventors of the present application have proposed a nut and a special tool for preventing such theft in a previous application (Patent Document 1).

JP-A-2018-3974

However, as a result of further research after the above-mentioned prior application, the inventors of the present application have found the following new problems.
That is, although there is no unevenness on the outer peripheral surface 13 of the nut 10, since the portion close to the bottom surface 11 is formed in a cylindrical shape, the nut 10 can be held by holding that portion with a tool such as pliers having a strong holding force. It was found that there was a risk of loosening.
Further, if all the outer peripheral surfaces 13 of the nut 10 are tapered surfaces, it becomes difficult to hold the outer peripheral surface 13 with a tool, but the inner wall 15c of the recess 15 of the nut 10 is hit with a punch or the like to slightly reduce the nut 10. It was found that if the nut 10 is loosened and a gap is formed between the peripheral edge of the bottom surface 11 of the nut 10 and the object to be fastened, the peripheral edge of the bottom surface 11 can be held by a tool, and the nut 10 may be loosened. ..

Therefore, the present invention has been created as a result of diligent research in order to solve the above-mentioned problems, and it is more difficult to loosen the nut member and a special tool capable of further enhancing the crime prevention effect. The main purpose is to realize it.

(Invention according to claim 1)
In order to achieve the above-mentioned object, the invention according to claim 1 of the present application
A nut member (10) for fastening an object to be fastened (50, 51) by screwing it into a bolt (60).
Bottom (21) and
The upper surface (22), which is formed on the opposite side of the bottom surface (21) and has a diameter (φ1) smaller than the diameter (φ2) of the bottom surface (21),
A tapered surface (23) continuously formed between the peripheral edge (21a) of the bottom surface (21) and the peripheral edge (22a) of the upper surface (22),
A mounting portion (27) for mounting a special tool (40) used for fastening the nut member (10), which is recessed from the top surface (22) to the bottom surface (21).
A base (24) protruding from the bottom surface (21) and
An opening is formed in the bottom surface (24b) of the base portion (24), and a first hole (28c) for inserting the tip (61) of a bolt (60) for screwing the nut member (10).
An opening is formed in the bottom surface (27a) of the mounting portion (27), and a second hole (28a) for projecting the tip (61) of the bolt (60) and
A bolt insertion that communicates between the first hole (28c) and the second hole (28a) and has a female threaded portion (28b) that meshes with the male threaded portion (62) of the bolt (60) on the inner wall surface. Hole (28) and
It is rotatably mounted on the outer peripheral surface (24a) of the base portion (24), and includes an annular member (30) having an outer diameter (φ7) equal to or larger than the diameter (φ2) of the bottom surface (21).
A technical means is used in which the bottom surface (24b) of the base (24) projects from the annular member (30).

(Invention according to claim 2)
In the invention according to claim 2, the nut member (10) according to claim 1 is used.
A protrusion (26) formed on one of the outer peripheral surface (24a) of the base portion (24) and the inner peripheral surface (34) of the annular member (30).
The outer peripheral surface (24a) of the base portion (24) and the inner peripheral surface (34) of the annular member (30) are continuously formed in the other circumferential direction, and the annular member (30) is attached to the base portion (24). A fitting portion (35) that can be fitted with the protrusion (26)
Has the technical means of having.

(Invention according to claim 3)
In the invention according to claim 3, the nut member (10) according to claim 1 is used.
A circle is formed between the bottom surface (24b) of the base portion (24) protruding from the annular member (30) and the annular member (30) rotatably mounted on the outer peripheral surface (24a) of the base portion (24). A technical means is used in which a retaining member (80) is mounted to prevent the annular member (30) from coming off.

(Invention according to claim 4)
In the invention according to claim 4, in the nut member (10) according to claim 3,
The retaining member uses a technical means of being a washer (80).

(Invention according to claim 5)
In the invention according to claim 5, in the nut member (10) according to any one of claims 1 to 4.
When the upper surface (22) is viewed in a plan view, the technical means that the shape of the inner wall (27b) of the mounting portion (27) is the shape of the hexarobula hole is used.

(Invention according to claim 6)
In the invention according to claim 6, in the nut member (10) according to any one of claims 1 to 5.
The technical means of having an R on the upper edge of the inner wall (27b) is used.

(Invention according to claim 7)
In the invention according to claim 7, in the nut member (10) according to any one of claims 1 to 6.
In the bolt insertion hole (28), when the object to be fastened (50, 51) is fastened using the nut member (10) and the bolt (60), the tip (61) of the bolt (60) is the upper surface (22). The technical means that it is formed to a length protruding from is used.

(Invention according to claim 8)
In the invention according to claim 8, in the nut member (10) according to any one of claims 1 to 7.
The technical means that the tapered surface (23) is not formed with irregularities and corners is used.

(Invention according to claim 9)
In the invention according to claim 9, in the nut member (10) according to any one of claims 1 to 8.
The technical means of having a matable lid (90) on the mounting portion (27) is used.

(Invention according to claim 10)
In the invention according to claim 10, it is a special tool for rotating the nut member (10) according to any one of claims 1 to 9.
Body (41) and
A convex portion (42) having a shape protruding from one end (41a) of the body portion (41) and matching the mounting portion (27) of the nut member (10).
A bolt (60) having an opening formed in one end surface (42a) of the convex portion (42) and protruding from the second hole (28a) when the convex portion (42) is mounted on the mounting portion (27). The nut member (41) has an insertion hole (44) into which the tip (61) of the head can be inserted, and the body portion (41) is rotated while the convex portion (42) is attached to the attachment portion (27). The technical means that 10) is configured to be rotatable is used.

The reference numerals in the parentheses indicate the correspondence with the specific means described in the embodiments described later.

(Invention according to claim 1)
According to the invention of claim 1, even if the tapered surface is sandwiched between the tools, it is difficult to rotate the nut member because the contact area between the tool and the tapered surface is small and the tool is slippery.
Moreover, since an annular member having an outer diameter equal to or larger than the diameter of the bottom surface is rotatably mounted on the outer peripheral surface of the base, the annular portion becomes an obstacle even if the peripheral edge of the bottom surface is pinched by a tool. , The periphery cannot be pinched with a tool. Further, even if the annular member is sandwiched between the tools and rotated, the annular member only idles around the base portion, and the base portion does not rotate.
Therefore, it is difficult to loosen the nut member.

(Invention according to claim 2)
According to the invention of claim 2, since the annular member can be fitted to the base portion, there is no possibility that the annular member will be separated from the base portion. Moreover, since the fitting portion is continuously formed in the circumferential direction, when the annular member is rotated along the outer peripheral surface of the base portion, the protrusion and the fitting portion are fitted in a state where the protrusion is fitted to the fitting portion. Since one of the portions moves along the other, the annular member can be smoothly rotated.
Therefore, even if the annular member is sandwiched between the tools and rotated, the rotational force does not act as a force for rotating the nut, which makes it even more difficult to loosen the nut member.

(Invention according to claim 3)
According to the invention of claim 3, in order to prevent the annular member from coming off between the bottom surface of the base protruding from the annular member and the annular member rotatably mounted on the outer peripheral surface of the base. Since the retaining member is attached, it is possible to prevent the annular member from coming off.

(Invention according to claim 4)
According to the invention of claim 4, it is possible to prevent the annular member from coming off from the base portion by a relatively simple operation of attaching the washer to the base portion.

(Invention according to claim 5)
According to the invention of claim 5, when the upper surface is viewed in a plan view, the shape of the inner wall of the mounting portion is the shape of the hexalobular hole, so that the nut is formed by hitting the inner wall of the mounting portion with the tip of a chisel or punch. Even if an attempt is made to rotate the member, it is difficult to rotate the nut member because the tip of the member slips on the inner wall.
That is, it is difficult to loosen the nut member with a general tool.

(Invention according to claim 6)
According to the invention of claim 6, since the upper edge of the inner wall has an R, when the tip of the special tool is attached to the mounting portion, the tip does not get caught in the upper edge of the inner wall and follows the R. Since it is guided toward the bottom of the inner wall, a special tool can be easily mounted on the mounting portion.

(Invention according to claim 7)
According to the invention of claim 7, the bolt insertion hole is formed to have a length in which the tip of the bolt protrudes from the upper surface when the object to be fastened is fastened using the nut member and the bolt. Even if a tool other than a special tool such as a screwdriver or a Phillips screwdriver is inserted into the mounting portion, it is difficult to loosen the nut member because the bolt protruding from the upper surface becomes an obstacle.

(Invention according to claim 8)
According to the invention of claim 8, since the tapered surface is not formed with irregularities and corners, the method of locking the tip of the tool to the irregularities or corners to loosen the nut member can be sealed. ..

(Invention according to claim 9)
According to the invention of claim 9, since the mounting portion has a lid that can be fitted, the tool cannot be inserted into the mounting portion, so that it becomes more difficult to loosen the nut member.
Moreover, since it is possible to prevent rainwater, dust, etc. from entering the mounting portion, there is no possibility that the nut member and the bolt will rust and the nut member cannot be loosened.

(Invention according to claim 10)
If the special tool of the invention according to claim 10 is used, the tip of the bolt protruding from the second hole is inserted into the insertion hole, and the body portion is rotated with the convex portion fitted to the nut mounting portion. , The nut member can be tightened or loosened.

According to the present invention, it is possible to realize a nut member and a special tool that are more difficult to loosen and can further enhance the crime prevention effect.

It is explanatory drawing of the nut member which concerns on embodiment of this invention, (a) is a side view, (b) is a side view of a nut body and an annular member. It is explanatory drawing of the nut main body shown in FIG. 1, (a) is a plan view, (b) is a sectional view taken along the line AA of (a), and (c) is a view taken along the line BB of (a). It is a sectional view. (A) is an enlarged view of FIG. 2 (b), and (b) is an enlarged view of a protrusion shown in (a). It is explanatory drawing of the annular member shown in FIG. 1, (a) is a plan view, (b) is a bottom view, (c) is a sectional view taken along the line AA of (a), and (d) is a side view. is there. It is explanatory drawing of the nut member shown in FIG. 1, (a) is a plan view, (b) is a sectional view taken along the line AA of (a), and (c) is a sectional view taken along the line BB of (a). Is. It is explanatory drawing of the special tool which concerns on embodiment of this invention, (a) is a side view, (b) is a plan view, (c) is a bottom view. It is explanatory drawing which shows the state which tries to fit a special tool in the nut member screwed with a hexagon bolt. It is explanatory drawing of the nut member which concerns on 2nd Embodiment of this invention, (a) is a side view, (b) is a side view of a nut body, an annular member and a washer. 8 is an explanatory view of the washer shown in FIG. 8, where FIG. 8A is a plan view and FIG. 8B is a cross-sectional view taken along the line AA of FIG. 8A. 8 is an explanatory view of the nut member shown in FIG. 8, where FIG. 8A is a plan view, FIG. 8B is a sectional view taken along the line AA of FIG. 8A, and FIG. 8C is a sectional view taken along the line BB of FIG. Is. It is explanatory drawing of the lid used for the nut member which concerns on 3rd Embodiment of this invention, (a) is a plan view, (b) is a side view, (c) is a bottom view. It is explanatory drawing which shows the state which attached the lid shown in FIG. 11 to the nut member shown in FIG.

<First Embodiment>
The first embodiment of the nut member according to the present invention will be described with reference to FIGS. 1 to 7.
[Structure of nut member]
As shown in FIG. 1, the nut member 10 of the present embodiment includes a nut body 20 and an annular member 30 rotatably mounted on the nut body 20.
(Structure of nut body 20)
As shown in FIG. 1 (b), the nut body 20 includes a bottom surface 21, an upper surface 22, a tapered surface 23, a mounting portion 27 (FIG. 2 (a)), a base portion 24, and a first hole 28c ( 2 (b) and 2 (c)), a second hole 28a (FIG. 2 (a)), and a bolt insertion hole 28 (FIG. 2) are provided. The bottom surface 21 is formed in a circular shape, and the upper surface 22 having a circular peripheral edge 22a is formed on the opposite side thereof. As shown in FIG. 3A, the diameter φ1 of the upper surface 22 is smaller than the diameter φ2 of the bottom surface 21. A tapered surface 23 is continuously formed between the circular peripheral edge 21a of the bottom surface 21 and the circular peripheral edge 22a of the upper surface 22. In other words, the bottom surface 21, the top surface 22, and the tapered surface 23 form a truncated cone shape. Further, the tapered surface 23 is not formed with any irregularities or corners.

Therefore, even if an attempt is made to rotate the nut member 10 by holding the tapered surface 23 with a tool such as a wrench, the contact area between the tool and the tapered surface 23 is small and the tool slips, so that the nut member 10 is rotated and loosened. Is difficult.
Further, since the tapered surface 23 is not formed with any irregularities or corners, the method of locking the tip of the tool to the irregularities or corners to loosen the nut member 10 can be sealed.

A base 24 is formed so as to protrude from the bottom surface 21. The base 24 is formed in a substantially cylindrical shape. The bottom surface 24b of the base portion 24 is formed in a circular shape, and a first hole 28c for inserting the tip 61 (FIG. 7) of the hexagon bolt 60 is formed in the center of the bottom surface 24b.
As shown in FIG. 2, the mounting portion 27 is a portion for mounting the convex portion 42 (FIG. 6) of the special tool 40, and is formed by being recessed from the upper surface 22 to the bottom surface 21. A bottom surface 27a facing the top surface 22 is formed on the bottom of the mounting portion 27. A second hole 28a for projecting the tip 61 of the hexagon bolt 60 is formed in the bottom surface 27a. As shown in FIGS. 3 and 5 (b) and 5 (c), a bolt insertion hole 28 for inserting the hexagon bolt 60 communicates between the first hole 28c and the second hole 28a. There is. On the inner wall surface of the bolt insertion hole 28, a female screw portion 28b that meshes with the male screw portion 62 (FIG. 7) of the hexagon bolt 60 is formed. Hexagon bolts are an example of bolts.

As shown in FIG. 7, in the bolt insertion hole 28, when the objects 50 and 51 to be fastened are fastened using the nut member 10 and the hexagon bolt 60, the tip 61 of the hexagon bolt 60 exceeds the upper surface 22 of the nut body 20. It is formed so as to project to a height.
Therefore, even if a tool other than the special tool such as a flat-blade or Phillips screwdriver is to be inserted into the mounting portion 27, it is difficult to loosen the nut member 10 because the hexagon bolt 60 protruding from the upper surface 22 becomes an obstacle.

When the upper surface 22 is viewed in a plan view, the shape of the inner wall 27b of the mounting portion 27 is a curved surface 27c bulging toward the peripheral edge of the second hole 28a and a curved surface 27d bulging toward the peripheral edge of the second hole 28a. It is composed of and. The curved surface 27c and the curved surface 27d are alternately and continuously formed, and the inner wall 27b is formed in the shape of a so-called hexarobula hole having three curved surfaces 27c and three curved surfaces 27d, respectively.
Therefore, even if the tip of a chisel or punch is inserted into the mounting portion 27 to rotate the nut member 10, the tip slips on the inner wall 27b, and it is difficult to rotate the nut member 10.
That is, the nut member 10 cannot be loosened unless a special tool 40 (FIG. 6) having a convex portion 42 that matches the shape of the inner wall 27b of the mounting portion 27 is used.
Further, on the upper edge of the inner wall 27b, a first upper edge 27e close to the upper surface 22 and a second upper edge 27f close to the bottom surface 27a are formed, and the first upper edge 27e and the second upper edge 27e are formed. An outward curve is formed between the edge 27f and the edge 27f. That is, R is attached to the upper edge of the inner wall 27b.

As shown in FIG. 1B, protrusions 26 are continuously formed on the outer peripheral surface 24a of the base portion 24 in the circumferential direction. In other words, an annular protrusion 26 is formed on the outer peripheral surface 24a of the base 24 when viewed from the direction of the bottom surface 24b of the base 24. As shown in FIG. 3B, the protrusion 26 is formed of an outer peripheral surface 26a, a first side surface 26b, a second side surface 26c, a first peripheral edge 26d, and a second peripheral edge 26e. ing. The first side surface 26b and the second side surface 26c are formed so as to rise from the outer peripheral surface 24a of the base portion 24, respectively, and the second side surface 26c is formed on the opposite side of the first side surface 26b. An outer peripheral surface 26a is arranged between the upper edge of the first side surface 26b and the upper edge of the second side surface 26c. An R is attached to the first peripheral edge 26d, which is the boundary between the outer peripheral surface 26a and the first side surface 26b. Further, R is also attached to the second peripheral edge 26e, which is the boundary between the outer peripheral surface 26a and the second side surface 26c.

The height of the protrusion 26 from the peripheral surface of the base 24, that is, the protruding height is d1, and the thickness of the protrusion 26 is w1. As shown in FIG. 3A, the diameter φ3 of the base 24 is larger than the diameter φ1 of the upper surface and smaller than the diameter φ2 of the bottom surface 21. The diameter φ4 of the protrusion 26 is larger than the diameter φ3 of the base 24 and smaller than the diameter φ2 of the bottom surface 21.

(Structure of annular member 30)
As shown in FIG. 1A, the annular member 30 is rotatably mounted on the peripheral surface of the base 24 of the nut body 20. The bottom surface 24b of the base 24 of the nut body 20 projects from the annular member 30. As shown in FIG. 4, the annular member 30 is formed in an annular shape in a plan view, and its outer diameter φ7 is slightly larger than the diameter φ2 (FIG. 3) of the bottom surface 21 of the nut body 20 (FIG. 1). (A)). Therefore, as shown in FIG. 1A, when the annular member 30 is attached to the base 24 of the nut body 20, the outer peripheral surface 33 of the annular member 30 slightly protrudes from the peripheral edge 21a of the bottom surface 21 of the nut body 20. It will be in the state of As a result, even if an attempt is made to pinch the peripheral edge 21a of the bottom surface 21 with a tool, the annular member 30 becomes an obstacle and cannot be pinched.

As shown in FIG. 4C, the annular member 30 includes a first side surface 31, a second side surface 32, an outer peripheral surface 33, and an inner peripheral surface 34. The first side surface 31 and the second side surface 32 are each formed in an annular shape in a plan view, and a second side surface 32 is formed on the opposite side of the first side surface 31. No irregularities or corners are formed on the outer peripheral surface 33. An annular outer peripheral surface 33 is continuously formed between the first side surface 31 and the second side surface 32. The first outer peripheral edge 31a, which is the boundary between the outer peripheral surface 33 and the first side surface 31, and the second outer peripheral edge 32a, which is the boundary between the outer peripheral surface 33 and the second side surface 32, are formed on the C surface, respectively. Has been done. A fitting portion 35 that can be fitted with a protrusion 26 (FIG. 1 (b)) of the nut body 20 is formed on the inner peripheral surface 34. The fitting portion 35 is formed by a first inner peripheral surface 35a continuously formed with the first side surface 31 and a second inner peripheral surface 35b continuously formed with the second side surface 32. The second inner peripheral surface 35b is formed one step lower than the first inner peripheral surface 35a. That is, the fitting portion 35 is a stepped portion having a step. Further, an R is attached to the inner peripheral edge 36 which is the boundary between the first side surface 31 and the first inner peripheral surface 35a.

The diameter of the first inner peripheral surface 35a, that is, the minimum inner diameter φ5 of the annular member 30, is slightly larger than the diameter φ3 of the base 24 of the nut body 20 and slightly larger than the diameter φ4 of the protrusion 26. small. For example, it is 0.02 mm smaller (φ5 = φ4-0.02 mm). That is, when the annular member 30 is attached to the base 24, the first side surface 31 of the annular member 30 is brought into contact with the second side surface 26c of the protrusion 26 of the base 24 so that the annular member 30 is in contact with the second side surface 26c. When the second side surface 32 is pressed with a predetermined force by a predetermined pressing means, the annular member 30 elastically deforms in the direction of expanding the inner diameter φ5 of the first inner peripheral surface 35a, and the first inner of the annular member 30 The peripheral surface 35a gets over the protrusion 26, and the outer peripheral surface 26a of the protrusion 26 faces the second inner peripheral surface 35b. That is, the protrusion 26 is fitted to the fitting portion 35. When fitting in this way, the inner peripheral edge 36 of the annular member 30 and the second peripheral edge 26e of the protrusion 26 first come into contact with each other, but the inner peripheral edge 36 of the annular member 30 and the protrusion 26 come into contact with each other. Since R is attached to each of the second peripheral edges 26e of the above, the first inner peripheral surface 35a of the annular member 30 is less likely to be caught when getting over the protrusion 26, and the contact resistance is reduced. Therefore, it is easy to fit the protrusion 26 to the fitting portion 35 of the annular member 30.

Further, once the annular member 30 is rotatably mounted on the nut body 20, there is almost no gap between the annular member 30 and the bottom surface 21 of the nut body 20, as shown in FIG. Since it is difficult to insert a tool or the like between the annular member 30 and the bottom surface 21 of the nut body 20, there is no possibility that the annular member 30 will come off from the base 24. That is, the nut member 10 has a structure in which the annular member 30 can be easily attached to the base 24 of the nut body 20 and the annular member 30 cannot be easily removed from the base 24.
Therefore, when fastening the nut member 10, even if the nut body 20 to which the annular member 30 is rotatably mounted is held, the annular member 30 does not come off from the nut body 20, so that the nut member 10 is fastened. Easy to do. Further, since the annular member 30 can be stored in a state of being attached to the nut body 20, there is no possibility that one of the nut body 20 and the annular member 30 will be lost.

The distance between the first inner peripheral surface 35a and the outer peripheral surface 33, that is, the wall thickness of the thickest portion of the annular member 30, is d2. Further, the depth of the fitting portion 35 is d3. Further, the distance between the first side surface 31 and the second side surface 32, that is, the thickness of the annular member 30 is w2, the thickness of the first inner peripheral surface 35a is w3, and the second The thickness of the inner peripheral surface 35b of the above is w4. The depth d3 of the fitting portion 35 is slightly deeper than the height d1 (FIG. 3 (b)) of the protrusion 26 of the nut body 20 (d3> d1). Further, the thickness w4 of the second inner peripheral surface 35b is wider than the thickness w1 of the protrusion 26 of the nut body 20 (w4> w1). That is, when the annular member 30 is attached to the base 24 of the nut body 20 and the protrusion 26 is fitted to the fitting portion 35, a gap is formed between the periphery of the protrusion 26 and the fitting portion 35. It is configured to. Further, the thickness of the first inner peripheral surface 35a is w3 between the first side surface 26b (FIG. 3 (b)) of the protrusion 26 and the bottom surface 21 (FIG. 3 (a)) of the nut body 20. Slightly smaller than the distance. That is, when the annular member 30 is attached to the nut body 20, a slight gap is formed between the first side surface 31 of the annular member 30 and the bottom surface 21 of the nut body 20. ..
As a result, the annular member 30 mounted on the base 24 becomes rotatable around the base 24 as a rotation axis.
That is, even if an attempt is made to rotate the nut member 10 by holding the outer peripheral surface 33 of the annular member 30 with a tool, the annular member 30 only rotates about the base 24 and the nut body 20 does not rotate. It is difficult to loosen the member 10.

[Structure of special tool]
Next, the structure of the dedicated tool for tightening and loosening the nut member 10 will be described with reference to FIG.

The special tool 40 includes a body portion 41, a convex portion 42, and a hexagonal portion 43. The body portion 41 is formed in a cylindrical shape. The convex portion 42 is formed so as to project from one end 41a of the body portion 41, and is formed in a shape that matches the mounting portion 27 (FIG. 2) of the nut body 20. That is, as shown in FIG. 6B, the convex portion 42 is formed in a shape that fits into the hole-shaped mounting portion 27 of the hexarobula. The hexagonal portion 43 is formed so as to protrude from the other end 41b of the body portion 41, and is formed in the shape of a hexagon nut. The hexagonal portion 43 is a portion held by a tool such as a box wrench, a socket wrench, and a spanner. An insertion hole 44 for inserting the tip 61 (FIG. 7) of the hexagon bolt 60 is formed through the convex portion 42, the body portion 41, and the hexagonal portion 43. The insertion hole 44 communicates from one end surface 42a of the convex portion 42 to the other end surface 43a of the hexagonal portion 43 through the body portion 41.
The insertion hole 44 may be bottomed without being formed through. Further, the outer peripheral surface of the body portion 41 can be formed into a hexagonal shape, and the range held by the tool can be lengthened. In this case, the hexagonal portion 43 may not be provided.

[How to use the nut member 10 and the special tool 40]
Next, how to use the nut member 10 and the special tool 40 will be described with reference to FIG. Here, a case of fastening a metal plate-shaped object to be fastened will be described.

A through hole 50a for inserting the hexagon bolt 60 is formed through the fastening object 50, and a through hole 51a for inserting the hexagon bolt 60 is formed through the fastening object 51. The through holes 50a and 51a communicate with each other so that the hexagon bolt 60 can be inserted.
First, the tip 61 of the hexagon bolt 60 inserted through the washer (washer) 70 is inserted through the through hole 50a into the through hole 51a. Next, the tapered surface 23 of the nut body 20 is pinched with a finger or the like, and while rotating the nut body 20 clockwise, the bolt insertion hole 28 of the nut body 20 is screwed into the tip 61 of the hexagon bolt 60 protruding from the through hole 51a. It fits. Then, the convex portion 42 of the special tool 40 is fitted to the mounting portion 27 of the nut body 20. At this time, since the upper edge of the inner wall 27b (FIG. 5A) of the mounting portion 27 has an R, even if the tip of the convex portion 42 of the special tool 40 comes into contact with the upper edge of the inner wall 27b, It is smoothly guided toward the bottom surface 27a along the inner wall 27b without being caught on the upper edge. Then, after fitting the convex portion 42 of the special tool 40 to the mounting portion 27 of the nut member 10, the hexagonal portion 43 of the special tool 40 is held by a tool such as a box wrench, a socket wrench, and a spanner, and the tool is rotated clockwise. The nut member 10 is tightened to the object to be fastened 51. Then, when the fastening torque of the nut member 10 reaches a predetermined tightening torque, the tightening of the nut member 10 is stopped, the convex portion 42 of the special tool 40 is removed from the mounting portion 27 of the nut member 10, and the nut member 10 is used. Tightening work is completed (Fig. 7).

Further, when loosening the nut member 10 to which the objects to be fastened 50 and 51 are fastened, the convex portion 42 of the special tool 40 is fitted to the mounting portion 27 of the nut member 10, and a tool such as a box wrench, a socket wrench and a spanner is used. Hold the hexagonal portion 43 of the special tool 40 and rotate the tool counterclockwise to loosen the nut member 10.
In this way, when the special tool 40 is used, the nut member 10 is tightened or loosened by rotating the hexagonal portion 43 in a state where the convex portion 42 of the special tool 40 is fitted to the mounting portion 27 of the nut member 10. be able to.

For example, when the nut member 10 is fastened to a hexagon bolt 60 having a nominal diameter of 8 mm, the diameter φ1 (FIG. 3) of the upper surface 22 of the nut body 20 is 15.0 mm, the diameter φ2 of the bottom surface 21 is 19.0 mm, and the diameter of the base 24. φ3 is 16.0 mm, and the diameter φ4 of the protrusion 26 is 16.6 mm. In this case, the protruding height d1 of the base portion 24 of the protrusion 26 from the outer peripheral surface 24a is 0.3 mm (= (16.6 mm-16.0 mm) × 1/2), and the thickness w1 of the protrusion 26 is It is 1.0 mm.
Further, the outer diameter φ7 (FIG. 4 (c)) of the annular member 30 is 20.0 mm, which is 1.0 mm (= 20.0 mm-19) larger than the diameter φ2 (19.0 mm) of the bottom surface 21 of the nut body 20. .0 mm) Large. That is, when the annular member 30 is attached to the base portion 24, the outer peripheral surface 33 of the annular member 30 protrudes 0.5 mm (= 1.0 mm × 1/2) vertically from the peripheral edge 21a of the bottom surface 21.

Further, the inner diameter φ6 of the second inner peripheral surface 35b of the fitting portion 35 of the annular member 30 is 16.8 mm, and the inner diameter φ5 of the first inner peripheral surface 35a is 15.98 mm. Further, the thickness between the outer peripheral surface 33 and the second inner peripheral surface 35b, that is, the thinnest wall thickness d2 of the annular member 30, is 1.6 mm (= (20.0 mm-16.8 mm) × 1/2). , The length from the first inner peripheral surface 35a to the second inner peripheral surface 35b, that is, the depth d3 of the fitting portion 35 is 0.41 mm (= (16.8 mm-15.98 m) × 1/2. ). The thickness w2 of the annular member 30 is 3.8 mm, and the thickness w3 of the second inner peripheral surface 35b of the fitting portion 35 is 1.2 mm.
That is, the height d1 of the protrusion 26 is 0.3 mm, and the depth d3 of the fitting portion 35 is 0.41 mm. Therefore, when the protrusion 26 is fitted to the fitting portion 35, the protrusion 26 is fitted. Since a gap of 0.11 mm (= 0.41 mm-0.3 mm) is formed between the outer peripheral surface 26a of the above and the bottom surface 35c of the fitting portion 35, the annular member 30 is the outer peripheral surface of the base 24. It becomes rotatable with respect to 24a.

Further, the height of the inner wall 27b (FIG. 2) of the mounting portion 27, that is, the depth of the mounting portion 27 is 3.0 mm. Further, among the curved surfaces forming the inner wall 27b, the maximum width (width between the first upper edges 27e) of the opposite curved surfaces 27d of the curved surface 27d bulging outward is 13.49 mm, and the minimum width (second). The width between the upper edges 27f) is 13.36 mm. Further, the maximum width (width between the first upper edges 27e) of the opposing curved surfaces 27c of the curved surface 27c bulging inward is 9.68 mm, and the minimum width (width between the second upper edges 27f) is 9. It is .55 mm. That is, the width between the first upper edge 27e and the second upper edge 27f is 0.065 mm (= (13.49 mm-13.36 mm) × 1/2). Further, the radius of curvature of the curved surface 27d bulging outward is 1.13 mm, and the radius of curvature of the curved surface 27c bulging inside is 2.83 mm.
The bolt insertion hole 28 is formed so that the tip of the hexagon bolt protrudes 2.0 to 3.0 mm from the upper surface 22 when the nut member 10 is fastened to the object to be fastened.
It should be noted that each of the above numerical values is an example and can be appropriately changed depending on the bolt and the object to be fastened. For example, if the annular member 30 is rotatably mounted on the nut body 20 and the annular member 30 does not easily come off the nut body 20, the protruding height d1 of the protrusion 26 is 0.05 to It may be 0.25 mm.

The material of the nut member 10 can be selected from iron, stainless steel, aluminum, titanium, brass, copper, etc., depending on the place of use. Further, the surface of the nut member 10 can be treated by selecting from trivalent chromate plating, zinc-nickel alloy plating, geomet, cationic electrodeposition coating and the like, depending on the place of use.

As described above, the nut member 10 of the present embodiment is formed on the bottom surface 21 and the side opposite to the bottom surface 21, and has an upper surface 22 having a diameter φ1 smaller than the diameter φ2 of the bottom surface 21 and a peripheral edge 21a and an upper surface of the bottom surface 21. A tapered surface 23 continuously formed between the peripheral edge 22a of the 22 and a mounting portion 27 which is recessed from the upper surface 22 toward the bottom surface 21 and for mounting the special tool 40 used for fastening the nut member 10. A first hole 28c for inserting the tip 61 of a hexagon bolt 60 into which an opening is formed in the base portion 24 protruding from the bottom surface 21 and the bottom surface 24b of the base portion 24 and screwing the nut member 10, and a mounting portion 27. An opening is formed in the bottom surface 27a of the hexagon bolt, and the tip 61 of the hexagon bolt 60 communicates between the second hole 28a for projecting and the first hole 28c and the second hole 28a. A circle having a bolt insertion hole 28 formed in the inner wall surface and a rotatably mounted on the outer peripheral surface of the base 24, and having an outer diameter φ7 having a diameter of φ2 or more of the bottom surface 21 of the female screw portion 28b that meshes with the male screw portion 62 of 60. An annular member 30 is provided, and the bottom surface 24b of the base portion 24 is characterized in that it protrudes from the annular member 30.
As described above, if the nut member 10 and the special tool 40 of the present embodiment are implemented, it is possible to provide a nut member that is more difficult to loosen and can further enhance the crime prevention effect.

<Second Embodiment>
Next, the second embodiment of the present invention will be described with reference to FIGS. 8 to 10.
The nut member 10 of the present embodiment includes a washer (washer) 80. The washer 80 is a flat washer (flat washer). As shown in FIG. 8, a step portion 24d is formed between the outer peripheral surface 24a and the bottom surface 24b of the base portion 24 of the nut body 20. The step portion 24d is formed coaxially with the base portion 24, and is formed in a substantially cylindrical shape. The annular member 30 is rotatably mounted on the outer peripheral surface 24a of the base portion 24, and the washer 80 is mounted and fixed on the outer peripheral surface of the step portion 24d. Further, as shown in FIG. 8A, the bottom surface of the base portion 24, that is, the bottom surface 24b of the step portion 24d protrudes from the washer 80. The bottom surface 24b and the washer 80 may be flush with each other. In this way, the washer 80 is mounted and fixed to the step portion 24d forming a part of the base portion 24 of the nut body 20, and is intended to prevent the annular member 30 from coming off from the base portion 24. Further, in the nut member 10 of the present embodiment, a protrusion 26 (FIG. 3) is formed on the outer peripheral surface 24a of the base portion 24 in order to prevent the annular member 30 from coming off by mounting and fixing the washer 80 to the base portion 24. It has not been. Further, the fitting portion 35 (FIG. 4) is not formed on the inner peripheral surface 34 of the annular member 30.

As shown in FIG. 9, the washer 80 is formed in an annular shape, and has a first side surface 81 of the annular shape in a plan view, a second side surface 82 of the annular shape in a plan view, an outer peripheral surface 85, and an inner peripheral surface. It has 83 and. The inner peripheral edge 84, which is the boundary between the first side surface 81 and the inner peripheral surface 83, is marked with an R. The inner diameter φ8 of the washer 80 is slightly smaller than the diameter of the step portion 24d, and when the washer 80 is mounted on the step portion 24d, the inner peripheral edge 84 of the washer 80 becomes the outer peripheral edge of the step portion 24d (bottom surface 24b of the base portion 24). It is a size that abuts on 24e. That is, when the washer 80 is attached to the step portion 24d, the inner peripheral edge 84 of the washer 80 is brought into contact with the outer peripheral edge 24e of the step portion 24d, and from that state, the washer 80 is moved toward the peripheral edge 24c of the base portion 24 of the nut body 20. When pressed against, the first side surface 81 of the washer 80 is elastically or plastically deformed, and the inner diameter φ8 expands. Therefore, the step portion 24d is inserted into the washer 80, and the washer 80 can be moved to the vicinity of the annular member 30. Yes (Fig. 10). The outer diameter φ9 of the washer 80 is smaller than the outer diameter φ7 (FIG. 4) of the annular member 30. This makes it difficult for the tool to hold the outer peripheral surface 85 of the washer 80. The washer 80 is made of a metal such as iron or stainless steel. The washer 80 is an example of a retaining member.
As described above, if the nut member 10 of the present embodiment is implemented, the washer 80 is attached to the step portion 24d of the base portion 24, which is a relatively simple operation to prevent the annular member 30 from coming off from the base portion 24. be able to.

<Third Embodiment>
Next, the third embodiment of the present invention will be described with reference to FIGS. 11 and 12.
11A and 11B are explanatory views of a lid used for a nut member according to the present embodiment, where FIG. 11A is a plan view, FIG. 11B is a side view, and FIG. 11C is a bottom view. FIG. 12 is an explanatory view showing a state in which the lid shown in FIG. 11 is attached to the nut member shown in FIG. 7.
The nut member 10 of the present embodiment includes a lid 90 to be mounted on the mounting portion 27. The lid 90 includes a covering portion 91 having a circular shape in a plan view, and a protruding portion 92 formed so as to project from the bottom surface of the covering portion 91. The covering portion 91 is formed to have the same diameter as the peripheral edge 22a (FIG. 2B) of the upper surface 22 of the nut body 20. The protrusion 92 is formed in a cylindrical shape, and an insertion portion 93 for inserting the tip 61 of the hexagon bolt 60 protruding from the second hole 28a of the nut body 20 is formed inside. Further, the cover portion 91 is formed with a notch portion 94 for inserting a tool having a sharp tip such as a pin when the lid 90 is removed from the nut body 20.
As shown in FIG. 12, when the lid 90 is mounted on the mounting portion 27 of the nut body 20, the tip 61 of the hexagon bolt 60 is inserted into the insertion portion 93, and the outer peripheral edge of the covering portion 91 and the peripheral edge 22a of the nut body 20. Matches. That is, the mounting portion 27 of the nut body 20 is sealed by the lid 90.
In this embodiment, the lid 90 is made of synthetic resin and has flexibility. Further, the inner diameter of the protrusion 92 is slightly smaller than the nominal diameter of the hexagon bolt 60, and when the tip 61 of the hexagon bolt 60 is inserted, the protrusion 92 is slightly elastically deformed and the male screw thread of the hexagon bolt 60 protrudes. It is crimped to the inner wall of the portion 92 so that it cannot be easily removed.

As described above, if the nut member 10 of the present embodiment is implemented, the mounting portion 27 can be prevented from being exposed by mounting the lid 90 on the mounting portion 27 of the nut body 20, so that the tool can be mounted. Since it can be prevented from being inserted into the portion 27, it becomes more difficult to loosen the nut member.
Moreover, since it is possible to prevent rainwater, dust, and the like from entering the mounting portion 27, there is no risk that the nut member 10 and the hexagon bolt 60 will rust and the nut member 10 cannot be loosened.

[Place to which the nut member of the present invention can be applied]
(1) By using the nut member of the present invention as a member for fixing the battery to the vehicle, the anti-theft effect of the battery can be enhanced. For example, a battery mounted on a vehicle is fixed to the vehicle by a stay straddling the upper part of the battery, a pair of bolts inserted at both ends of the stay, and a pair of nuts screwed into each bolt. If the nut member of the present invention is used as each of these nuts, it becomes difficult to loosen the nut member, so that the theft of the battery can be prevented. In particular, the anti-theft effect is high when applied to vehicles that are vulnerable to theft because the battery is exposed outside the vehicle, such as trucks, crane vehicles, forklifts, and other special vehicles.

(2) When a vending machine or ATM (automated teller machine) is fixed in place by bolts and nuts, by using the nut member of the present invention as the nut, the vending machine or ATM can be used. The anti-theft effect can be enhanced.
(3) In recent years, theft damage of solar panels installed outdoors has frequently occurred. When a solar panel installed outdoors is attached to an installation table using bolts and nuts, the anti-theft effect of the solar panel installed outdoors by using the nut member of the present invention as the nut. Can be enhanced.

(4) In addition, the nut member of the present invention is used for objects attached by bolts and nuts, such as bridges and building nameplates, surveillance cameras, air conditioner outdoor units, warm water toilet seats for public toilets, street lights, and surface grids. By using it, the anti-theft effect of those things can be enhanced.
(5) Further, since bolts and nuts are frequently used for playground equipment installed in parks and the like, by using the nut member of the present invention as the nut, the effect of preventing mischief by loosening the nut is enhanced. be able to.

<Other Embodiments>
(1) The shape of the mounting portion 27 may be a combination of five or seven or more curved surfaces 27c and 27d, in addition to the shape of the hexarobula hole. Further, the shape of the mounting portion 27 may be a polygon such as a triangle, a quadrangle, a pentagon, or a hexagon, and the shape of the convex portion 42 of the special tool 40 is also formed so as to fit the mounting portion 27. Is also good.
(2) The protrusion 26 (FIG. 3) is formed along the inner peripheral surface 34 (FIG. 4 (c)) of the annular member 30, and the fitting portion 35 (FIG. 4 (c)) is formed on the outer peripheral surface of the base 24. It can also be formed in 24a (FIG. 3).

(3) The protrusions 26 may be formed at one or a plurality of locations without forming an annular shape.
(4) The fitting portion 35 may be formed in a concave shape that can be fitted to the protrusion 26.
(5) The nut body 20 may be formed of iron, the annular member 30 may be magnetized, and the annular member 30 may be attached to the base 24 of the nut body 20 by magnetic force. In this case, it is not necessary to form the protrusion 26 and the fitting portion 35.

(6) In the second embodiment, a flat washer (washer) is used as the washer 80, but a spring washer, a disc spring washer, a toothed washer, or the like can also be used. Further, another retaining member may be used instead of the washer. For example, rubber or resin packing can also be used.
(7) In the third embodiment, the lid 90 can be formed of a rubber material or a metal material.

10 ・ ・ Nut member 21 ・ ・ Bottom surface 21a ・ Peripheral surface 22 ・ ・ Top surface 22a ・ Peripheral surface 24 ・ ・ Base part 24a ・ Outer peripheral surface 24b ・ Bottom surface 26 ・ ・ Protrusion 27 ・ ・ Mounting part 27a ・ Bottom surface 28 ・ ・ Bolt insertion hole 28a・ 2nd hole 28b ・ Female thread 28c ・ 1st hole 30 ・ ・ Circular member 34 ・ ・ Inner peripheral surface 35 ・ ・ Fitting part 40 ・ ・ Special tool 60 ・ ・ Hexagon bolt 61 ・ ・ Tip 23 ・ ・Tapered surface φ1 ・ ・ Diameter of top surface 22 φ2 ・ ・ Diameter of bottom surface 21 φ7 ・ ・ Outer diameter of annular member 30

Claims (10)

A nut member for fastening an object to be fastened by screwing it into a bolt.
On the bottom and
A top surface that is formed on the opposite side of the bottom surface and has a diameter smaller than that of the bottom surface.
A tapered surface continuously formed between the peripheral edge of the bottom surface and the peripheral edge of the upper surface,
A mounting portion that is recessed from the upper surface to the bottom surface and for mounting a special tool used for fastening the nut member, and a mounting portion.
The base protruding from the bottom surface and
An opening is formed in the bottom surface of the base portion, and a first hole for inserting the tip of a bolt for screwing the nut member, and
A second hole is formed in the bottom surface of the mounting portion for the tip of the bolt to protrude, and
A bolt insertion hole that communicates between the first hole and the second hole and has a female screw portion formed on the inner wall surface that meshes with the male screw portion of the bolt.
It is rotatably mounted on the outer peripheral surface of the base portion, and includes an annular member having an outer diameter equal to or larger than the diameter of the bottom surface.
A nut member having a bottom surface of the base projecting from the annular member. A protrusion formed on one of the outer peripheral surface of the base portion and the inner peripheral surface of the annular member, and
A fitting portion that is continuously formed in the other circumferential direction of the outer peripheral surface of the base portion and the inner peripheral surface of the annular member, and can be fitted to the protrusion when the annular member is mounted on the base portion. ,
The nut member according to claim 1, wherein the nut member has. A retaining member for preventing the annular member from coming off is provided between the bottom surface of the base portion protruding from the annular member and the annular member rotatably mounted on the outer peripheral surface of the base portion. The nut member according to claim 1, wherein the nut member is mounted. The nut member according to claim 3, wherein the retaining member is a washer. The nut member according to any one of claims 1 to 4, wherein the shape of the inner wall of the mounting portion is the shape of a hexarobula hole when the upper surface is viewed in a plan view. The nut member according to any one of claims 1 to 5, wherein an R is attached to the upper edge of the inner wall. Claim 1 is characterized in that the bolt insertion hole is formed so that the tip of the bolt protrudes from the upper surface when the fastening object is fastened using the nut member and the bolt. The nut member according to any one of claims 6. The nut member according to any one of claims 1 to 7, wherein the tapered surface is not formed with irregularities and corners. The nut member according to any one of claims 1 to 8, wherein the mounting portion has a lid that can be fitted. A dedicated tool for rotating the nut member according to any one of claims 1 to 9.
With the torso
A convex portion that is formed so as to project from one end of the body portion and has a shape that matches the mounting portion of the nut member.
An opening is formed on the upper surface of the convex portion, and when the convex portion is mounted on the mounting portion, the convex portion has an insertion hole into which the tip of a bolt protruding from the second hole can be inserted. A dedicated tool characterized in that the nut member is rotatably configured by rotating the body portion while the convex portion is mounted on the mounting portion.

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