JP4567489B2 - Detachable security device for fixing bolts and nuts - Google Patents

Description

The present invention can be used when a fixed object is fixed to an object to be screwed with a fixing bolt, or when a fixed object is fixed to a bolt fixed to the object using a fixing nut. The present invention relates to a detachable security device for a fixing bolt and a fixing nut that protects an object to be fixed from theft.

When fixing parts such as automobile license plates and aluminum wheels to the vehicle body, or when fixing devices such as transformers and vending machines to the installation location, usually fixing them using fixing bolts or fixing nuts. Has been done.

In recent years, crimes of stealing only a license plate from the body of a parked car or the like are increasing. A person who commits this crime removes the fixing bolt using a commercially available device such as a driver and steals only the license plate in a short time.

In order to prevent theft cases that are performed by removing such fixing bolts and fixing nuts, the applicant of the present invention has already provided a fixing bolt and a fixing nut crime prevention device that does not expose the head of the fixing bolt or the fixing nut to the outside. It has been proposed (Japanese Patent Application No. 2004-364488).

FIG. 15 is an exploded perspective view showing the configuration of the fixing nut security device, and FIG. 16 is a cross-sectional view of the fixing nut security device mounted.

In FIGS. 15 and 16, F is a floor formed of concrete or the like, and 3 is a bolt partially embedded in the floor F. Reference numeral 5 denotes an object to be fixed such as a vending machine or a transformer that is fixed to the floor F that is an object by the bolt 3 and the fixing nut 4. 4 b is a washer that comes into contact with the lower end surface of the fixing nut 4, and 10 is a spacer for forming a gap between the washer 4 b and the surface of the fixed object 5.

Reference numeral 20 denotes a crowning member that is crowned on the fixing nut 4, and 30 is a peripheral wall member that covers the outer surface of the crowning member 20. The crown member 20 is made of metal, and the peripheral wall member 30 is also made of metal. However, the material constituting the crown member 20 and the material constituting the peripheral wall member 30 are not limited to the above materials. Absent.

The crown member 20 includes a top plate portion 21 and a plurality of side wall portions 22 extending downward from the peripheral portion of the top plate portion 21 (in the direction of the nut 4 as viewed from the top plate portion 21) and the peripheral wall member locking. The nail | claw 24 and 25 are comprised.

The lower end portion of the side wall portion 22 is inserted into the space S formed by the spacer 10 between the fixing nut 4 and the washer 4b and the surface of the object 5 to be fixed to the lower end surface of the fixing nut 4 via the washer 4b. A locking claw 26 for abutting the nut is formed. Thus, spacer 1
0 is used as a space forming means arranged to form the gap S in which the nut locking claw 26 can be inserted. The space forming means is not limited to the spacer 10, and as already disclosed in Japanese Patent Application No. 2004-364488 by the applicant of the present application, the space forming means may be a spacer portion or a tapered portion integrally formed on the lower surface side of the fixing nut. Good.

The metallic crowning member 20 is formed in a state where the side wall portion 22 and the peripheral wall member locking claws 24, 25 are slightly opened so that the fixing member 4 and the washer 4b can be easily covered. ing.

A circular protrusion 31 is formed at the lower end of the inner peripheral wall surface of the peripheral wall member 30 so as to protrude inward along the entire periphery. By being pressed by the circular protrusion 31 of the peripheral wall member 30, the nut locking claw 26 of the crown member 20 maintains a state in which it is in contact with the lower end surface of the fixed nut 4 via the washer 4 b. Can do.

Here, as shown in FIG. 16, the peripheral wall member locking claws 24, 25 disposed on the elastic metal crown member 20 have a circular protrusion on the peripheral wall member 30 at its lower end. It is formed so as to contact the upper surface portion of the portion 31. The peripheral wall member locking claws 24, 25 are circular projections 31.
Therefore, the peripheral wall member 30 attached to the crowning member 20 cannot be easily removed.

In the state shown in FIG. 16 in which the crown member 20 and the peripheral wall member 30 are mounted on the fixed nut 4 as described above, it is extremely difficult to expose the fixed nut 4 to the outside.

In the security device for fixing nuts configured as described above, the peripheral wall member 30 and the crown member 20 can be easily removed by using a dedicated locking release tool 60 as shown in FIG.

The unlocking tool 60 is a member having a hollow cylindrical shape as shown in FIGS. The outer diameter of the locking release tool 60 is selected to be a value that can be fitted inside the peripheral wall member 30 as shown in FIGS. 12 (a) and 12 (b). Further, the inner diameter of the locking release tool 60 is selected to be equal to or smaller than the inner diameter of the upper surface portion of the circular protrusion 31 of the peripheral wall member 30.

Such an unlocking tool 60 is inserted into the peripheral wall member 30 as shown in FIG.
As shown in FIG. 18 (b), when the tip portion is brought into contact with the upper surface portion of the circular protrusion 31, the engagement between the peripheral wall member locking claws 24, 25 of the crown member 20 and the circular protrusion 31. The combined state can be released. Accordingly, as shown in FIG. 18C, the peripheral wall member 30 can be separated from the fixing nut 4 together with the locking release member 60.

If the crowning member 20 is completely exposed as shown in FIG. 18C, the crowning member 20 can be easily detached from the fixing nut 4. Therefore, the fixing nut 4 can be easily exposed.

If the fixing nut 4 is exposed to the outside as described above, the fixing nut 4 can be easily removed using a general instrument such as a box wrench .

In the fixing nut security device described above, when the peripheral wall member 30 is removed using the locking release tool 60, the peripheral wall member 30 is removed while being held by hand as shown in FIG. 18 (c). Therefore, the following problems occur.

That is, like the fixing nut 4 for fixing the wheel H of the vehicle tire T shown in FIGS. 19 and 20, the crown member 20 and the peripheral wall member 30 are mounted on the fixing nut 4 that is buried in the fixed state. In some cases, it can perform a crime prevention function. However,
When it is necessary to remove the fixing nut 4 such as when exchanging tires, even if the engagement state between the crown member 20 and the peripheral wall member 30 is released using the locking release tool 60, the peripheral wall member 30 and the wheel H Since the gap between the two is narrow, it becomes extremely difficult to remove the peripheral wall member 30 by hand.

In other words, when the fixing bolt and the fixing nut crime prevention device described above are attached to the head or the fixing nut of the fixing bolt that is buried in a state where the fixed object is fixed to the object,
When it becomes necessary to remove the fixing bolt or the fixing nut, there arises a problem that it becomes extremely difficult to remove the security device.

According to the present invention, firstly, a detachable crime prevention device for a fixing nut comprising a security device for a fixing nut to be attached to the fixing nut, and a mounting release tool for releasing the mounting state of the security device for the fixing nut. The security device for the fixing nut is configured such that when a fixed object through which a bolt fixed to the object can be inserted is fixed to the bolt with the fixing nut screwed to the bolt, A space forming means for forming a gap between the end surface and the surface of the object to be fixed; a top plate portion; and a plurality of side wall portions extending downward from a peripheral portion of the top plate portion; A crowning member that is crowned to a nut, wherein a lower end portion of the plurality of side wall portions is sandwiched between a surface of the fixed object and a lower end surface of the fixing nut when the fixing nut is crowned. A locking claw for a nut that can be inserted into the formed gap is formed. A crown wear member that, a hollow cylindrical peripheral wall member covering the outer surface of the crown adhesive member was capped on the fixing nut, the lower end of the inner peripheral wall surface of the peripheral wall member,
A circular protrusion that protrudes inwardly and presses the side wall of the crown member is formed, and a plurality of circular flanges that protrude inwardly are formed at the upper end of the inner peripheral wall surface. A peripheral wall member formed with a circular flange having a notch of the peripheral wall member, and the locking member is a peripheral wall member locking claw that engages with an upper surface portion of the circular protrusion of the peripheral wall member. The peripheral claw for the peripheral wall member extending downward from the peripheral edge of the top plate portion is formed, and the inside of the peripheral wall member has an outer diameter that is substantially the same as the inner diameter of the peripheral wall member. A ring whose inner diameter is equal to or smaller than the inner diameter of the circular protrusion is disposed in a loosely-fitted state, and the dismounter extends vertically downward from the main body and includes a plurality of circular flange portions. Each of the notches includes a plurality of pressing legs that can be fitted from above, and a handle disposed at the top of the main body. The push leg is inserted into the notch and is pushed down until the ring is in contact with the upper edge of the circular protrusion, and the upper edge of the ring and the circular flange are It has a length that is equal to or greater than the distance to the edge, and on the one side of both sides from the position corresponding to the lower edge of the circular collar, upward from the thickness of the circular collar It is possible to provide a detachable security device for a fixing nut, characterized in that a cut portion having a length is formed.

Here, a circular canopy portion may be formed integrally with the circular collar portion inside the circular collar portion of the peripheral wall member.

Further, the handle portion disposed on the upper portion of the body of the mounting release tool is a bolt that is threadedly engaged with a female screw portion formed at a central portion of the main body and penetrates the main body, and has a long length. However, the top plate portion of the crown member and the lower end of the main body in a state where the pressing leg portion is inserted into the notch portion and the ring is pushed down until it abuts on the upper edge portion of the circular projection portion. Bolts longer than the distance to the part may be provided.

According to the present invention, secondly, a fixing bolt security device that is mounted on the head of the fixing bolt, and a mounting bolt attachment / detachment device that includes a mounting release tool that releases the mounting state of the fixing bolt security device. When the fixing bolt security device is fixed to an object having a female screw portion screwed into the fixing bolt with the fixing bolt, the fixing bolt security device is inserted through the fixing bolt. Space forming means for forming a gap between the lower end surface of the head of the fixing bolt and the surface of the fixed object, and a plurality of side wall portions extending downward from the top plate portion and the peripheral portion of the top plate portion A fixing member that is attached to the head of the fixing bolt, and is fixed to the lower end of the plurality of side wall portions when attached to the head of the fixing bolt. Inserted into the gap formed between the surface of the fixing bolt and the lower end surface of the head of the fixing bolt And a hollow cylindrical peripheral wall member that covers an outer surface portion of the crown member that is crowned on the head of the fixing bolt. A circular protrusion is formed on the lower end of the inner peripheral wall so as to project inward and press the side wall of the crown member. The upper end of the inner peripheral wall protrudes inward. And a circumferential wall member formed with a circular collar having a plurality of notches, and the crown member has an upper surface portion of the circular protrusion of the circumferential wall member. An engaging claw for the peripheral wall member to be engaged, the engaging claw for the peripheral wall member extending downward from the peripheral edge of the top plate portion is formed, and an inner diameter of the peripheral wall member is defined on the inner side of the peripheral wall member. substantially have the same outer diameter, inner diameter is less than the inner diameter of the circular protrusion ring is arranged in a loosely fitted state, the undock Arranged on the upper part of the main body, a plurality of pressing legs that extend vertically downward from the main body and can be fitted from above into each of the plurality of notches of the circular flange. The push leg is inserted into the notch and is pushed down until the ring abuts the upper edge of the circular projection, and the upper edge of the ring. And a length that is equal to or greater than the distance between the upper edge of the circular flange and the upper side from a position corresponding to the lower edge of the circular flange on one side of both sides. It is possible to provide a detachable security device for a fixing bolt, characterized in that a cut portion having a length equal to or greater than the thickness of the circular flange portion is formed.

Here, a circular canopy portion may be formed integrally with the circular collar portion inside the circular collar portion of the peripheral wall member.

Further, the handle portion disposed on the upper portion of the body of the mounting release tool is a bolt that is threadedly engaged with a female screw portion formed at a central portion of the main body and penetrates the main body, and has a long length. However, the top plate portion of the crown member and the lower end of the main body in a state where the pressing leg portion is inserted into the notch portion and the ring is pushed down until it abuts on the upper edge portion of the circular projection portion. Bolts longer than the distance to the part may be provided.

According to the present invention, it is necessary to remove the object to be fixed from the object even if the security device is attached to the head or the fixing nut of the fixing bolt that is buried when the object is fixed to the object. In this case, the head of the fixing bolt and the fixing nut can be easily exposed to the outside.

  Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are views showing the configuration of the first embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a cross-sectional perspective view showing the internal configuration of the peripheral wall member 30, and FIG. 3 is shown in FIG. 3 is a cross-sectional view of the crown member 20 and the peripheral wall member 30. FIG.

1 to 3, the same reference numerals as those in FIGS. 15 and 16 showing the conventional example described above denote the same parts, and the description thereof will be omitted.

The difference between the first embodiment and the conventional example is the configuration of the peripheral wall member 30 and the configuration of the mounting / dismounting tool 70 shown in FIGS. 1 and 2 used to remove the peripheral wall member 30. The configuration of the peripheral wall member 30 and the mounting release tool 70 will be described with reference to FIGS. 1 and 2.

As shown in FIG. 2, a circular protrusion 31 similar to the conventional example is formed at the lower end portion of the inner peripheral wall surface of the peripheral wall member 30. In the first embodiment, a circular flange 32 that protrudes inwardly from the upper end of the inner peripheral wall surface of the peripheral wall member 30 is disposed. A plurality of notches 33 are formed in the circular flange 32 as shown in FIG.

Further, in the first embodiment, as shown in FIG. 2, the ring 34 is disposed between the circular protrusion 31 and the circular flange 32 in a loosely fitted state. The outer diameter of the ring 34 is such that the peripheral wall member 3
The value is selected to be substantially the same as the inner diameter of 0, and the inner diameter is selected to be a value equal to or smaller than the inner diameter of the circular protrusion 31. Therefore, the ring 34 is disposed inside the peripheral wall member 30 so as to be movable in the vertical direction between the circular protrusion 31 and the circular flange 32.

The dismounter 70 includes a main body 71 and a plurality of pressing legs 72 disposed on the main body 71 so as to extend vertically downward (in the direction from the main body 71 toward the crown member 20 in FIGS. 1 and 2). When,
A handle portion 73 is provided on the upper portion of the main body 71.

Here, each of the plurality of pressing leg portions 72 is formed in a shape that can be fitted into each of the plurality of notch portions 33 formed on the upper portion of the peripheral wall member 30 from above.

The length of the pressing leg 72 is shown in a state where the pressing leg 72 is fitted into the notch 33 and the ring 34 is pushed down until it comes into contact with the upper edge of the circular protrusion 31 (shown in FIG. 5B). In this state, the length is selected to be equal to or longer than the distance between the upper edge of the ring 34 and the upper edge of the circular flange 32.

In addition, a cut portion 72 a is formed on one side of each side of each pressing leg portion 72. In the state shown in FIG. 5B described above, the cut-out portion 72a of the pressing leg portion 72 is formed in the circular flange portion upward from a position corresponding to the lower edge portion of the circular flange portion 32. It is formed to have a length of 32 or more.

Therefore, in the state where each of the plurality of pressing legs 72 is fitted into the notch 33 and pressed down until the ring 34 is brought into contact with the upper edge of the circular protrusion 31, the pressing legs 72 are cut. Part 7
It can be rotated to the side where 2a is formed. When the pressing leg portion 72 is rotationally moved in the direction of the notch portion 72a, the lower end portion of the notch portion 72a comes into contact with the lower edge portion of the circular flange portion 32 of the peripheral wall member 30.

  Next, the operation of the first embodiment configured as described above will be described with reference to FIGS.

First, when the crown member 20 and the peripheral wall member 30 are attached to the fixing nut 4, FIG.
As shown in (c) to (c), the peripheral wall member 30 is mounted after the crowning member 20 is mounted on the fixing nut 4 as in the conventional example. In the mounting process of the peripheral wall member 30, the ring 34 moves upward in the peripheral wall member 30 while being in contact with the crowning member 20.

When removing the crown member 20 and the peripheral wall member 30 attached to the fixing nut 4 in this way, as shown in FIG. 5A, the handle 73 of the attachment release tool 70 is held by hand and pressed. Leg 7
The position 2 is adjusted to the position of the notch 33 and inserted into the peripheral wall member 30 until it stops. After the pressing leg 72 is inserted, as shown in FIG. 6A, the main body 71 is rotated and moved in the direction (A direction) where the notch 72a is formed until it stops. The state shown in FIG. In the state shown in FIG. 6B, the lower end portion of the cut portion 72 a is in contact with the lower edge portion of the circular flange portion 32. In this state, that is, in the state shown in FIG. 5B, the peripheral wall member locking claws 24, 25 are moved inward by being pressed by the inner surface of the ring 34. 25 and the circular protrusion 31 have shifted from the engaged state to the disengaged state.

In this state, as shown in FIG. 7, the mounting release tool 70 is moved away from the fixing nut 4 to remove the peripheral wall member 30. If the outer wall member 30 is detached, the crown member 20 can be easily detached from the fixing nut 4 and the fixing nut 4 can be exposed to the outside.

As described above, in the first embodiment, it is possible to remove the peripheral wall member 30 without touching the hand. Therefore, even if the fixing nut 4 is in the embedded state, the peripheral wall member 30 and the crowning member 20 can be easily removed and the fixing nut 4 can be exposed to the outside.

In the above description, the fixing nut 4 is attached to the crown member 20 and the peripheral wall member 30 according to the first embodiment.
However, the crown member 20 and the peripheral wall member 30 according to the first embodiment can be screwed onto an object such as a floor F as shown in FIG. Even when the fixed object 2 is fixed with the fixing bolt 2, it can be mounted on the head 2 a of the fixing bolt 2. In FIG. 8, 23 is a bolt locking claw having the same configuration as the nut locking claw 26 shown in FIG. 3, and 2b is a washer.

9 to 11 are views showing the configuration of the second embodiment of the present invention. FIG. 9 is a perspective view, and FIG.
FIG. 11 is a cross-sectional perspective view showing the internal configuration of the peripheral wall member 30, and FIG. 11 is a cross-sectional view of the crown member 20 and the peripheral wall member 30 shown in FIG.

9 to 11, the same reference numerals as those in FIGS. 1 to 3 showing the configuration of the first embodiment described above denote the same parts, and the description thereof will be omitted.

The second embodiment is different from the first embodiment in that a circular canopy portion 32 a is formed so as to be integrated with the circular flange portion 32 inside the circular flange portion 32 of the peripheral wall member 30. is there.

Therefore, also in the second embodiment configured as described above, when the peripheral wall member 30 in the mounted state shown in FIG. 9 is removed, the pressing leg portion 72 of the mounting release tool 70 is inserted into the cutout portion 33, and the main body 7
If the mounting release tool 70 is not lifted upward after rotating 1, the peripheral wall member 30 can be removed as shown in FIG.

  In addition, the second embodiment can be mounted on the head of the fixing bolt as in the first embodiment.

In the second embodiment, as shown in FIG. 11, the peripheral wall member 30 is configured such that the circular canopy portion 32 is positioned above the top plate portion 21 of the crown member 20 in the mounted state. ing.

  FIG. 13 is a perspective view showing the configuration of the third embodiment of the present invention.

The difference between the third embodiment and the first embodiment described above is only the configuration of the mounting / dismounting tool 70, and the other configurations are the same as those of the first embodiment. The mounting release tool 70 will be described.

As shown in FIG. 13, in the third embodiment, a female screw portion 71a is formed in the central portion of the main body 71 of the mounting release tool 70, and the handle portion 73 is disposed on the female screw portion 71a. The mounting release tool 70 is configured such that the bolt 73a is screwed in a state of passing through the main body 71.

Here, as shown in FIG. 14A, the length of the bolt 73 a is such that the pressing leg portion 72 is placed in the peripheral wall member 30 until the ring 34 comes into contact with the upper edge portion of the circular protrusion 31 of the peripheral wall member 30. The value is selected so as to be longer than the distance between the lower end portion of the main body 71 and the top plate portion of the crown member 20 in the state of being inserted into the main body 71.

In the third embodiment configured as described above, when removing the peripheral wall member 30, first,
As shown in FIG. 13, the pressing leg portion 72 is inserted into the cutout portion 33, and the main body 71 is rotated to bring the lower end portion of the cutout portion 72 a into contact with the lower edge portion of the circular flange portion 32. Such a state (FIG. 14A)
When the handle 73 is rotated and the bolt 73a is tightened, the tip of the bolt 73a abuts against the top plate of the crown member 20 and its movement is restricted. At the same time, the peripheral wall member 30 moves upward.

Thus, in the third embodiment, by rotating the handle portion 73, FIG.
The peripheral wall member 30 can be removed as shown in FIG.

  Here, the third embodiment can be mounted on the head of the fixing bolt as in the first embodiment.

It is a perspective view which shows the structure of Example 1 of this invention. It is a cross-sectional perspective view which shows the structure of Example 1 of this invention. It is sectional drawing which shows the structure of Example 1 of this invention. It is operation | movement explanatory drawing of Example 1 of this invention. It is operation | movement explanatory drawing of Example 1 of this invention. It is operation | movement explanatory drawing of Example 1 of this invention. It is operation | movement explanatory drawing of Example 1 of this invention. It is explanatory drawing of a structure of Example 1 of this invention. It is a perspective view which shows the structure of Example 2 of this invention. It is a cross-sectional perspective view which shows the structure of Example 2 of this invention. It is sectional drawing which shows the structure of Example 2 of this invention. It is operation | movement explanatory drawing of Example 2 of this invention. It is a perspective view which shows the structure of Example 3 of this invention. It is operation | movement explanatory drawing of Example 3 of this invention. It is a perspective view which shows the structure of the conventional security device for fixing nuts. It is sectional drawing which shows the structure of the conventional security device for fixing nuts. It is explanatory drawing of the conventional security device for fixing nuts. It is explanatory drawing of the conventional security device for fixing nuts. It is explanatory drawing of the conventional security device for fixing nuts. It is explanatory drawing of the conventional security device for fixing nuts.

Explanation of symbols

2 Fixing bolt 2a Head 2b, 4b Washer 3 Bolt 4 Fixing nut 5 Fixed object 10 Spacer 20 Crowning member 21 Top plate part 22 Side wall part 23 Bolt locking claws 24, 25 Peripheral wall member locking claws 26 For nuts Locking claw 30 Peripheral wall member 31 Circular protrusion 32 Circular flange 33 Notch 34 Ring 70 Unmounting tool 71 Main body 71a Female thread 72 Pressing leg 72a Notch 73 Handle 73a Bolt A Direction F Floor S Cavity

Claims (6)

A detachable security device for a fixed nut, comprising a security device for a fixed nut to be attached to the fixed nut and a mounting release tool for releasing the mounting state of the security device for the fixed nut,
The security device for the fixing nut is
When a fixed object through which a bolt fixed to an object can be inserted is fixed to the bolt with the fixing nut screwed to the bolt, the lower end surface of the fixing nut and the surface of the fixed object are fixed. A space forming means for forming a void;
A crown member having a top plate portion and a plurality of side wall portions extending downward from a peripheral edge portion of the top plate portion, and is attached to the fixing nut, and is a lower end portion of the plurality of side wall portions. And a locking claw for a nut that can be inserted into a gap formed between the surface of the object to be fixed and the lower end surface of the fixing nut when the fixing nut is crowned. A wearing member;
A hollow cylindrical peripheral wall member that covers an outer surface portion of the crown member that is crowned to the fixing nut, and is protruded inwardly at a lower end portion of an inner peripheral wall surface of the peripheral wall member. A circular protrusion that presses the side wall is formed, and a circular flange having a plurality of notches is formed at the upper end of the inner peripheral wall surface. A peripheral wall member,
The crown member is a peripheral wall member locking claw that engages with an upper surface portion of the circular projection of the peripheral wall member, and the peripheral wall member engagement that extends downward from the peripheral edge of the top plate portion. A toe is formed,
On the inner side of the peripheral wall member, a ring having substantially the same outer diameter as the inner diameter of the peripheral wall member and having an inner diameter equal to or smaller than the inner diameter of the circular protrusion is provided in a loosely fitted state.
The demounting tool is
A main body, a plurality of pressing legs extending vertically downward from the main body and capable of being fitted from above into each of the plurality of cutout portions of the circular flange, and disposed on the upper portion of the main body. And the handle part,
The pressing leg is inserted into the notch and pushed down until the ring contacts the upper edge of the circular protrusion, and the upper edge of the ring and the upper edge of the circular flange And a length equal to or greater than the thickness of the circular flange from the position corresponding to the lower edge of the circular flange on one side of both sides. A detachable crime prevention device for a fixing nut, characterized in that a notch portion is formed. The detachable security device for a fixing nut according to claim 1, wherein a circular canopy portion is formed integrally with the circular flange portion on the inner side of the circular flange portion of the peripheral wall member. . The handle portion disposed on the upper portion of the body of the demounting tool is a bolt that is threadedly engaged with a female screw portion formed in the center portion of the main body and penetrates the main body, the length of which is The top plate part of the crown member and the lower end part of the main body in a state where the pressing leg part is fitted into the notch part and the ring is pushed down until it comes into contact with the upper edge part of the circular protrusion part. The detachable security device for a fixing nut according to claim 1, wherein a bolt longer than the distance is provided. A detachable security device for a fixing bolt, comprising a security device for a fixing bolt to be attached to the head of the fixing bolt, and a mounting release tool for releasing the mounting state of the security device for the fixing bolt,
The security device for the fixing bolt is
When a fixed object through which the fixing bolt can be inserted is fixed to an object having an internal thread portion screwed into the fixing bolt with the fixing bolt, a lower end surface of the head of the fixing bolt and a surface of the fixed object A space forming means for forming a gap between
A crown member having a top plate portion and a plurality of side wall portions extending downward from a peripheral edge portion of the top plate portion, and is attached to a head of the fixing bolt, wherein the plurality of side wall portions For the bolt that can be inserted into the gap formed between the surface of the fixed object and the lower end surface of the head of the fixing bolt when the head is fixed to the head of the fixing bolt. A crown member on which locking claws are formed;
A hollow cylindrical peripheral wall member that covers an outer surface portion of the crown member that is crowned on a head of the fixing bolt, and is protruded inwardly at a lower end portion of an inner peripheral wall surface of the peripheral wall member. A circular protrusion having a plurality of notches is formed at the upper end of the inner peripheral wall surface, the circular protrusion having a plurality of cutouts. A peripheral wall member formed with a portion,
The crown member is a peripheral wall member locking claw that engages with an upper surface portion of the circular projection of the peripheral wall member, and the peripheral wall member engagement that extends downward from the peripheral edge of the top plate portion. A toe is formed,
On the inner side of the peripheral wall member, a ring having substantially the same outer diameter as the inner diameter of the peripheral wall member and having an inner diameter that is equal to or less than the inner diameter of the circular protrusion,
The demounting tool is
A main body, a plurality of pressing legs extending vertically downward from the main body and capable of being fitted from above into each of the plurality of cutout portions of the circular flange, and disposed on the upper portion of the main body. And the handle part,
The pressing leg is inserted into the notch and pushed down until the ring contacts the upper edge of the circular protrusion, and the upper edge of the ring and the upper edge of the circular flange And a length equal to or greater than the thickness of the circular flange from the position corresponding to the lower edge of the circular flange on one side of both sides. A detachable crime prevention device for a fixing bolt, wherein a notch portion having a slit is formed. The detachable security device for fixing bolts according to claim 4, wherein a circular canopy portion is formed integrally with the circular flange portion on the inner side of the circular flange portion of the peripheral wall member. . The handle portion disposed on the upper portion of the body of the demounting tool is a bolt that is threadedly engaged with a female screw portion formed in the center portion of the main body and penetrates the main body, the length of which is The top plate part of the crown member and the lower end part of the main body in a state where the pressing leg part is fitted into the notch part and the ring is pushed down until it comes into contact with the upper edge part of the circular protrusion part. The detachable crime prevention device for fixing bolts according to claim 4, wherein a bolt longer than the distance is arranged.

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