JP2009299854A - Nut for theft prevention - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut for theft-prevention which can be fastened without employing a special tool and which is hardly loosened after being fastened. <P>SOLUTION: The nut for theft-prevention comprises a nut body formed of a cylindrical part having a spiral groove engraved in an inner peripheral surface and of a first serration blocking one opening in the cylindrical part and containing a through-hole, a turning body formed of a shaft part passing through the through-hole and a second serration, a cylinder body freely fitted to an outer periphery of the nut body and a lock body provided to a tip of the shaft body and made larger than a hole diameter of the through-hole. The nut body is provided with a first lock part becoming a lock part during rotation in one direction only. A surface facing the nut body of the turning body is provided with a second lock part locked in the first lock part provided to the nut body and turning the nut body in one direction only. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nut that is screwed to an object to be fastened, and particularly to an antitheft nut that is difficult to remove from the object to be fastened once screwed to the object to be fastened.

Various bolts and nuts have been proposed in which it is difficult to easily remove both bolts and nuts once they are fixed by a combination of bolts and nuts to which the objects to be fastened are attached.
For example, Patent Document 1 includes a bolt and a nut, and a washer is inserted between the nut and the object to be fastened. When the nut fastens the object to be fastened to the joint surface of the washer and the nut, the washer rotates. There are disclosed bolts and nuts having a wedge-shaped slope that does not serve as a locking portion when the nut is rotated in the reverse direction, and a structure in which a sharp fitting line provided on the washer is caused to bite into an object to be fastened to prevent the nut from loosening. . However, with such a structure, there is a problem that the processing cost of the washer is increased, and when the fastened object is hard, it cannot be dealt with.

  Further, Patent Document 2 discloses an apparatus for preventing theft by separating a bolt and a fastening material for fastening the bolt, attaching them with screw members, and removing the nut after attaching the nut to an object to be fastened. ing. However, in such a configuration, a nut tightening operation and a nut removing operation occur, and the number of work processes increases. If the user forgets to remove the nut, the role of preventing theft is lost.

  Further, in Patent Document 3, an umbrella-shaped flange portion is provided on the first serration of the screw shaft, and a rotation operation portion is provided at the upper end of the flange portion via a breakable bend portion. A configuration is disclosed in which when the above torque is applied to the bent portion, it is broken from the bent portion and no further force is applied to the object to be fastened, and the umbrella portion does not take a tool and cannot be loosened. . However, in such a configuration, there is a problem that the bolt cannot be loosened even if the bolt has to be loosened.

Utility Model Registration No. 3092753 Japanese Patent Laid-Open No. 10-37939 JP 2003-343537 A

  An object of the present invention is to provide an antitheft nut that can solve the above-mentioned problems and can be tightened without using a special tool and can be loosened as necessary even after tightening.

The anti-theft nut of the present invention includes a cylindrical portion having a spiral groove formed on the inner peripheral surface, a first serration that closes one opening of the cylindrical portion, and a hole formed in the first serration. A through-hole, a nut main body, a rotating body formed of a shaft portion penetrating the through-hole and a second serration, and a lock body provided at a tip portion of the shaft body,
On the first serration of the nut body, a first locking portion is formed which becomes a locking portion when rotating in one direction and does not become a locking portion when rotating in the reverse direction,
A second engaging portion that engages with a first engaging portion provided on the nut main body and rotates the nut main body only in one direction on a surface facing the first serration of the nut main body of the rotating body. The lock body is inserted into the cylindrical portion of the nut body, and has a maximum diameter larger than the diameter of the through hole.

The anti-theft nut of the present invention includes a cylindrical portion in which a spiral groove is formed on an inner peripheral surface, a first serration that closes one opening of the cylindrical portion, and the first serration. A nut body comprising a drilled through hole, a rotating body comprising a shaft portion and a second serration penetrating the through hole, a lock body provided at a tip portion of the shaft body, and an outer periphery of the nut body Consisting of a loosely fitted cylinder
On the first serration of the nut body, a first locking part is formed which becomes a locking part when rotating in one direction and does not become a locking part when rotating in the reverse direction. A second engaging portion that engages with a first engaging portion provided on the nut body and rotates the nut body only in one direction is formed on a surface facing the serration, and the lock body includes the nut. It is inserted into the cylindrical part of the main body, the maximum diameter is larger than the hole diameter of the through hole, and the cylindrical body is configured not to come out to the second serration side at the flange part of the rotating body.

  The cylindrical portion and the first serration are preferably integral.

  The nut body has a through-hole penetrating the shaft portion, and a first locking portion is formed on one surface which becomes a locking portion when rotating in one direction and does not become a locking portion when rotating in the reverse direction. It is preferable that the first serration is fixed to one opening of the cylindrical portion or the first serration.

  The second serration that constitutes the rotating body includes a flange portion that integrally includes the shaft portion, and a washer that is fixed to the flange portion and that has the second locking portion on a surface facing the cylindrical body. It is preferable that

Once the nut of the present invention is tightened, it becomes very difficult to loosen or remove it.
When removing the nut if necessary, the shaft body can be damaged and removed.
Further, when the rotating body 20 is damaged due to an illegal act or the like, it can be clearly seen that there is no rotating body 20 when viewed from the outside.

A first embodiment of the present invention will be described in detail with reference to the drawings.
A nut 100 shown in FIG. 1 includes a nut body 10, a rotating body 20, and a lock body 30. Each configuration will be described in detail.
1A is a sectional view showing a nut 100 according to the present embodiment, FIG. 1B is a plan view, FIG. 1C is a sectional view of a nut body 10, and FIG. 1D is a sectional view of a rotating body 20.
As shown in FIG. 1C, the nut body 10 includes a cylindrical portion 11 having a spiral groove 13 formed on the inner peripheral surface, and a first portion provided on a head portion that closes one of the cylindrical portions 11. It is composed of a serration 15 and a through-hole 17 drilled in the head. In addition, the cylindrical part 11 and the first serration 15 may be created integrally, as shown in the drawing, and may be created separately, for example, the two may be joined by welding, or the first serration and the head May be formed integrally and joined to the cylindrical portion of the cylinder by welding or the like.
On the first serration 15 of the nut body 10, as shown in FIG. 3 described later, a first locking portion 40 is formed which becomes a locking portion when rotating in one direction and does not become a locking portion when rotating in the reverse direction. ing.

  As shown in FIG. 1D, the rotating body 20 includes a shaft portion 22 that penetrates the through hole 17 formed in the nut body 10, and the shaft portion 22 and the second serration 24. The shaft portion 22 and the second serration 24 may be formed integrally, or may be created as separate bodies as shown in the figure and joined by welding or the like. The surface of the second serration 24 facing the first serration 15 of the nut body 10 is engaged with a first engagement portion 40 provided in the nut body 10 as shown in FIG. A second locking portion 50 that rotates the main body 10 only in one direction is formed.

  The second serration 24 constituting the rotating body 20 is not shown, but a flange portion integrally having the shaft portion 22, and a second locking portion fixed to the flange portion and facing a surface of the cylindrical body. You may comprise with the washer which has a part.

The lock body 30 is attached to the distal end portion of the shaft portion 22 of the rotating body 20 and is inserted into the cylindrical portion of the nut body 10, and the maximum diameter is configured to be larger than the hole diameter of the through hole 17.
A lock body 30 shown in FIG. 1 includes a bolt screw 31 and is screwed onto a nut portion 33 (see FIG. 1D) provided at the tip of the shaft portion 22. As will be described later with reference to FIG. 5, the length of the shaft portion 22 is determined when the rotating body 20 and the nut body 10 are separated, that is, when the lock body 30 is pulled up so as to contact the first serration 15. The first locking portion 40 and the second locking portion 50 are designed to be longer than the extent that the joint between the first locking portion 40 and the second locking portion 50 is released and a slight gap is opened between the two.

  The first locking portion 40 shown in FIG. 3 is composed of a plurality of contact surfaces (a cut surface 41, a locking portion to be engaged) provided radially in the radial direction from the center. The first locking portion 40 comprises a cut surface 41 and an inclined surface 45 that is lowered to a wedge-shaped inclined surface of the inclined cone surface with the cut surface 41 as an apex, and is formed in a second serration 24 described later. It is configured to rotate in only one direction, which meshes with the stopper 50 and fastens the nut body 10 to the object to be fastened, and rotates idly with respect to the rotational force in the reverse direction (direction in which fastening is loosened).

  As shown in FIG. 4, the second locking portion 50 is configured to mesh with the first locking portion so as to engage with the first locking portion 40 and rotate the nut body 10. That is, it is composed of a plurality of contact surfaces 51 (engagement locking portions) provided radially from the center in the radial direction. The contact surface 51 is composed of a cut surface 53 and an inclined surface 55 that has the cut surface 53 as an apex and is lowered in the shape of a wedge-shaped slant with an oblique conical surface.

The nut 100 is assembled by inserting the shaft portion 22 of the rotating body 20 into the through hole 17 of the nut body 10 and screwing the bolt portion of the bolt screw 31 serving as the lock body 30 into the nut portion 33 provided at the tip of the shaft portion 22. Fix it. Since the outer diameter of the lock body 30 is configured to be larger than the diameter of the through-hole 17, the nut body 10 and the rotary body 20 are coupled by attaching the lock body 30 to the shaft portion 22.
The lock body 30 is for preventing the rotating body 20 from coming off from the nut body 10. Therefore, the lock body 30 is larger than the hole diameter of the through hole 17 provided in the nut body 10, and the cylinder of the nut body 10. The structure is smaller than the inner diameter of the part. The lock body 30 only needs to play the role of preventing the rotating body 20 from coming off the nut body 10, and the shape thereof is not limited to that of the bolt screw 31 (circular) shown in the figure, and can be formed in a polygonal shape, a rod shape, or the like. .

FIG. 6A is a partial cross-sectional explanatory view showing a state in which the tire wheel 93 is attached to the stud bolt 91 provided on the vehicle body by the nut 100 described in the above embodiment. In addition, although this embodiment demonstrates as a nut which attaches the tire wheel 93 to the wheel frame 95 which is a structure, the nut 100 of this invention is not a vehicle as a structure, and is not the tire wheel 93 as a to-be-fastened object. Of course, the present invention can be widely applied.
First, the through hole 99 provided in the tire wheel 93 is inserted into the stud bolt 91. Next, the nut 100 is screwed onto the stud bolt 91. In order to screw the nut 100 onto the stud bolt 91, the second serration 24 is rotated. The second serration 24 has a polygon (for example, hexagonal) outer periphery, or a polygonal (for example, hexagonal as shown) square groove 26 provided on the top of the second serration. Apply a third tool to 26 and tighten.

When screwing and tightening the rotating body 20, as described above, for example, by inserting a hexagonal range (not shown) into the hexagonal groove 26 provided at the top of the rotating body 20 and turning the second locking portion provided on the rotating body 20. 50 engages with the first locking portion 40 provided on the nut body 10 to rotate the nut body 10, screw the nut body 10 into the stud bolt 91, and fix the tire wheel 93 to the stud bolt 91.
Needless to say, the nut body 10 is designed to have such a length that the tip of the stud bolt 91 and the lock body 30 do not come into contact with each other when the nut 100 is fastened to the stud bolt 91.

  As shown in FIG. 6, after the tire wheel 93 is fixed to the stud bolt 91 of the vehicle body with the nut 100, the rotating body 20 is rotated in the removing direction (the direction opposite to the tightening direction) to remove this connection. The one locking portion 40 and the second locking portion 50 are idle so that the rotational force of the second serration 24 is not applied to the nut body 10 and does not rotate in the direction in which the nut 100 is removed. It cannot be removed as it is.

  In the present embodiment, when the tire is replaced due to wear or puncture of the tire, that is, when the nut 100 is to be removed from the stud bolt 91, the rotating body 20 is pulled upward as shown in FIG. By pulling up the rotating body 20, a gap is formed between the nut body 10 and the rotating body 20. The shaft portion 22 of the rotating body 20 is cut using this gap. By cutting the shaft portion 22, the first serration of the nut body appears and engages with a third tool (driver, wrench, etc.) (not shown) provided on the first serration, so that the nut body 10 can be rotated. A third tool is attached to the concave portion (or convex portion) 19 to be rotated, and the nut main body 10 is rotated from the stud bolt 91 in a direction in which the nut main body 10 is removed (the direction opposite to the attaching direction). The tire can be removed from the vehicle body by removing the nut body 10 from the stud bolt 91.

The concave portion 19 is a polygonal hole that fits a polygonal wrench, a minus or plus groove into which a minus or plus driver can be inserted, a plurality of depressions, and the like.
In order to protect the object to be fastened from theft, nothing is provided in the first serration of the nut body 10 to prevent the rotation of the nut body 10 by the third tool, and also to the outer periphery of the cylindrical body. For example, a cylindrical shape is used so that the cylindrical body is not rotated by the third tool without providing unevenness.
Further, when the rotating body 20 is damaged due to an illegal act or the like, it is found that there is no rotating body 20 when viewed from the outside.
When attaching the tire to the car body again, use a new nut.

FIG. 2 is a sectional view showing a nut 700 according to the second embodiment of the present invention.
In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
2A is a sectional view showing the nut 700 of the second embodiment, FIG. 2B is a plan view, FIG. 2C is a sectional view of the nut body 10, and FIG. 2D is a sectional view of the rotating body 20. is there.
In the second embodiment, a cylindrical body 70 is provided on the outer periphery of the nut body 10 of the first embodiment.

  As shown in FIG. 2, the nut 700 according to the second embodiment includes a cylindrical portion 11 in which a spiral groove 13 is engraved on the inner peripheral surface, and a first serration 15 provided on one side of the cylindrical portion 11. The nut body 10 including the through-hole 17 drilled in the first serration 15, the rotating body 20 including the shaft portion 22 penetrating the through-hole 17 and the second serration 24, and the tip of the shaft portion 22 The lock body 30 provided in the section and the cylindrical body 70 loosely fitted on the outer periphery of the nut body 10.

A first locking portion 40 is formed on the first serration 15 of the nut body 10 so as to be a locking portion when rotating in one direction and not as a locking portion when rotating in the reverse direction. A surface of the main body facing the first serration is formed with a second locking portion 50 that locks with the first locking portion 40 provided on the nut body 10 and rotates the nut body only in one direction. The lock body 30 is inserted into the cylindrical portion 11 of the nut body 10 and has a maximum diameter larger than the diameter of the through hole.
Further, the cylindrical body 70 is configured so as not to come off at the first serration 15 or the flange portion of the second serration 24 as shown.

In the second embodiment, the cylindrical body 70 is loosely fitted on the outer periphery of the nut body 10. Since the cylindrical body 70 is loosely fitted on the outer periphery of the nut main body 10, the cylindrical body 70 can be rotated regardless of the nut main body 10. That is, even if the cylinder 70 is rotated, the force is not transmitted to the nut body 10. The cylinder 70 may be configured to have such a length that when the nut 700 is screwed onto the article to be fastened with the cylinder 70 fitted, the movement is prevented by the flange and the article to be fastened. preferable. By adjusting the length of the cylindrical body 70 in this way, one of the cylindrical bodies 70 is blocked by the fastened object, and the other is blocked from coming off at the flange portion of the first serration or the second serration. This prevents the cylinder 70 from moving due to vibrations or the like, and does not generate noise.
As shown in the drawing, the flange portion is formed by forming the outer diameter of the second serration 24 larger than the inner diameter of the cylindrical body 70. However, the flange portion is provided with a protrusion on the first serration 15 or the second serration 24. It can also be.
By covering the nut main body 10 with the cylindrical body 70 in this manner, even if the nut 700 is to be removed after the nut 700 is tightened, the nut main body 10 cannot be rotated by the cylindrical body 70, and therefore theft. Excellent effect for prevention.

FIG. 6B is a cross-sectional explanatory view showing a state in which the tire wheel 93 is attached to the stud bolt 91 provided on the vehicle body by the nut 700 of the second embodiment.
First, the through hole 99 provided in the tire wheel 93 is inserted into the stud bolt 91. Next, the nut 700 is screwed onto the stud bolt 91. When attaching the nut 700 to the stud bolt 91, the cylindrical body 70 is inserted into the nut body 10. In the figure, 99 is a spring washer.
In order to attach the nut 700 to the stud bolt 91, the hexagonal range (not shown) is inserted into the hexagonal groove 26 provided at the top of the rotating body 20, and the second locking portion 50 provided on the rotating body 20 is rotated. The nut main body 10 is rotated by meshing with the first locking portion 40 provided on the nut main body 10, the nut main body 10 is screwed into the stud bolt 91, and the tire wheel 93 is fixed to the stud bolt 91.

  As shown in FIG. 6 (B), after fixing the tire wheel 93 to the stud bolt 91 of the vehicle body with the nut 700, the rotating body 20 is rotated in the removing direction (the direction opposite to the tightening direction) to remove this coupling. However, the first locking portion 40 and the second locking portion 50 are idle, so that the rotational force of the second serration 24 is not applied to the nut body 10 and the nut 700 is not rotated in the disengagement direction. Further, even if the cylindrical body 70 is rotated by any method, the rotational force is not transmitted to the nut main body 10, so that the nut main body does not rotate. Therefore, once the nut 700 is tightened, it cannot be removed as it is. .

  In the present embodiment, when the tire is replaced due to wear or puncture of the tire, that is, when the nut 100 is to be removed from the stud bolt 91, the rotating body 20 is pulled upward as shown in FIG. By pulling up the rotating body 20, a gap is formed between the nut body 10 and the rotating body 20. The shaft portion 22 of the rotating body 20 is cut using this gap. By cutting the shaft portion 22, the first serration of the nut body appears and engages with a third tool (driver, wrench, etc.) (not shown) provided on the first serration, so that the nut body 10 can be rotated. A third tool is attached to the concave portion (or convex portion) 19 to be rotated, and the nut main body 10 is rotated from the stud bolt 91 in a direction in which the nut main body 10 is removed (the direction opposite to the attaching direction). The tire can be removed from the vehicle body by removing the nut body 10 from the stud bolt 91.

In the second embodiment, the nut body 10 is covered with the cylinder body 70, and the force is not transmitted to the nut body 10 even if the cylinder body 70 is rotated. If the rotating body 20 can be protected from theft and damaged due to fraud, etc., it will be found that the rotating body 20 and in some cases the cylindrical body 70 are not seen from the outside. Become.
When attaching the tire to the car body again, use a new nut.
If the length of the cylinder 70 is the same as the length of the nut body 10, when the nut 700 is fastened to the object to be fastened, the cylinder 70 is fixed between the object to be fastened and the flange portion, and vibrations, etc. Even if it is used at the place of occurrence, it does not emit noise and is suitable.

  1 and 2, a spring member (for example, a spiral spring) 80 is inserted between the first serration 15 and the lock body 30 of the above embodiment. By inserting the spring member 80 in this way, the gap between the nut body 10 and the rotating body 20 is always closed by the repulsive force of the spring member 80, and the rotating body 20 is allowed to move freely in a state where the fastened object is coupled. For example, it can be used without generating noise in use in a place where vibration occurs. 1 and 2 show the embodiment in which the spring member 80 is attached to the first and second embodiments, but there is no vibration or the like and the rotating body 20 does not move in the use state. Of course, the insertion of the spring member can be omitted.

BRIEF DESCRIPTION OF THE DRAWINGS It shows 1st embodiment of this invention, (A) is sectional drawing, (B) is a top view, (C) is sectional drawing of a nut main body, (D) is sectional drawing of a rotary body. FIGS. 2A and 2B show a second embodiment of the present invention, in which FIG. 3A is a cross-sectional view, FIG. 3B is a plan view, FIG. 3C is a cross-sectional view of a nut body, and FIG. . An embodiment of the nut body of the present invention is shown, (A) is a top view and (B) is a sectional view. An embodiment of the rotating body of the present invention is shown, in which (A) is a side view and (B) is a bottom view. It is sectional drawing which shows the state which pulled apart the nut main body and rotation body in one Embodiment of this invention. (A) (B) is explanatory drawing which shows the state which attached the nut of one Embodiment of this invention to the vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Nut 10 Nut main body 11 Cylindrical part 13 Spiral groove 15 1st serration 17 Through-hole 20 Rotating body 22 Shaft part 24 Second serration 26 Square groove 30 Locking body 33 Nut part 40 First latching part 41 Contact surface 45 Inclination Surface 50 Second locking portion 51 Contact surface 55 Inclined surface 700 Nut 70 Cylindrical body 80 Spring member 91 Stud bolt 93 Tire wheel 95 Frame

Claims (5)

A nut body comprising a cylindrical portion having a spiral groove formed on the inner peripheral surface, a first serration that closes one opening of the cylindrical portion, and a through-hole drilled in the first serration And a rotating body composed of a shaft portion penetrating the through hole and a second serration, and a lock body provided at a tip portion of the shaft body,
On the first serration of the nut body, a first locking portion is formed which becomes a locking portion when rotating in one direction and does not become a locking portion when rotating in the reverse direction,
A second engaging portion that engages with a first engaging portion provided on the nut main body and rotates the nut main body only in one direction on a surface facing the first serration of the nut main body of the rotating body. Formed,
The lock body is an anti-theft nut inserted into the cylindrical portion of the nut body and having a maximum diameter larger than the diameter of the through hole. A nut body comprising a cylindrical portion having a spiral groove formed on the inner peripheral surface, a first serration that closes one opening of the cylindrical portion, and a through-hole drilled in the first serration And a rotating body composed of a shaft portion penetrating the through hole and a second serration, a lock body provided at a tip portion of the shaft body, and a cylindrical body loosely fitted on the outer periphery of the nut body,
On the first serration of the nut body, a first locking portion is formed which becomes a locking portion when rotating in one direction and does not become a locking portion when rotating in the reverse direction,
A second engaging portion that engages with a first engaging portion provided on the nut main body and rotates the nut main body only in one direction on a surface facing the first serration of the nut main body of the rotating body. Formed,
The lock body is inserted into the cylindrical portion of the nut body, the maximum diameter is larger than the hole diameter of the through hole,
The nut is a theft prevention nut having a configuration in which the cylindrical body is configured not to come off to the second serration side at the flange portion of the rotating body.   The antitheft nut according to claim 1 or 2, wherein the cylindrical portion and the first serration are integrated.   The nut body has a through-hole penetrating the shaft portion, and a first locking portion is formed on one surface which becomes a locking portion when rotating in one direction and does not become a locking portion when rotating in the reverse direction. The anti-theft nut according to claim 1 or 2, wherein the first serration is fixed to one opening of the cylindrical portion or the first serration.   The second serration that constitutes the rotating body includes a flange portion that integrally includes the shaft portion, and a washer that is fixed to the flange portion and that has the second locking portion on a surface facing the cylindrical body. The antitheft nut according to claim 1 or 2.

Images