JP3212132U - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relate to a fixing device using a screw tool for preventing removal due to an unauthorized purpose such as mischief or theft, and to use a screw tool having a screw tool attaching / detaching tool engaging portion having various different special forms. In addition, a fixing device is provided that can be removed if necessary for a legitimate purpose. A fixing device (1) includes a first screw tool (2), a second screw tool (3), and a lid (4). The 1st screw tool 2 is a screw tool larger than the 2nd screw tool 3, and the 2nd screw tool engaging part 2a and the screw part 2b are provided. The 2nd screw tool 3 is a screw tool smaller than the 1st screw tool 2, and the 2nd screw tool exclusive attachment / detachment tool engaging part 3a and the screw part 3b are provided. The lid 4 is a cylindrical member having a top surface 4e. A head housing space 4a for the first screw tool is provided, and a second screw tool insertion hole 4b is formed in the top surface 4e. The outer peripheral surface is a screw tool attaching / detaching tool engagement preventing surface 4c. [Selection] Figure 2

Description

The present invention relates to a fixing device using a screw tool for preventing removal for illegal purposes such as mischief or theft, and in particular, a first screw tool and a lid that covers the head of the first screw tool. The present invention also relates to a fixing device comprising a second screw tool for coupling the lid to the first screw tool.

Conventionally, a so-called mischief prevention screw tool has been provided in order to prevent removal of the screw tool for illegal purposes such as tampering and theft, and is used, for example, for mounting a license plate of an automobile. In general, the provided screw tool includes a screw tool attaching / detaching tool engaging portion such as a tool hole for engaging a screw tool attaching / detaching tool provided on the head of the head having a plus symbol shape. Many are grooves or grooves with a minus sign. On the other hand, the tamper-proof screw tool as described above is provided with an attaching / detaching tool engaging portion for a screw tool having various special forms such as a petal-like recess or a rice ball-like recess on the head. There is.

By using the tamper-proof screw tool as described above, it is impossible to engage and disengage a screw tool attaching / detaching tool that is generally provided. Can not be easily removed, which is preferable.

An antitheft fixing device that fixes a member to be attached to a mounting member with a specific fixing tool, wherein the specific fixing device includes a shaft-like member having a threaded portion formed on an outer periphery thereof, and the shaft. A nut member that is screwed to the member, and the shaft member is screwed into a screw hole formed in the attachment member through a mounting hole provided in the member to be attached, The nut member screwed to the shaft-like member presses a peripheral edge portion of the attachment hole in the attachment member, and fixes the attachment member to the attachment member. The outer peripheral surface is formed so as to be gradually located radially inward as the distance from the mounting hole in any cross section along the axial direction of the shaft-shaped member, Do not have uneven parts to apply external force for rotation. An antitheft fixing device (see, for example, Patent Document 1 below) characterized in that the pin is inserted into the center of the end of the screw component at a fastening position by the screw component. It is a screw removal prevention material that prevents the removal of the fastening portion by forming a pilot hole in advance, and has an outer shape of a rotating body that covers the fastening portion, on the central axis of the rotating body shape A cover member that covers a fitting portion with a tightening tool formed in the torque transmission portion from the fastening tool to the fastening portion, in which the through hole is formed, and covers the center of the screw and the through hole; A screw removal prevention material comprising: a pin that passes through the through-hole of the cover member and is press-fitted into the pilot hole of the screw component and attaches the cover member to the screw component so as to cover the fastening portion ( For example, see Patent Document 2 below), or a bolt and Cover the base plate with a chamfered surface of about 30 degrees in advance, and by driving it from above, the skirt part bites into the seat surface of the bolt and nut and cannot be removed. (For example, refer to the following Patent Document 3).

By using a cover member or the like that covers the head of the screw tool as described above, the screw tool attaching / detaching tool such as a spanner can be engaged with the head of the screw tool and cannot be rotated. It is preferable that the screw tool cannot be easily removed under an unauthorized purpose.

Registered Utility Model No. 3181123 JP 2001-330020 A Design Registration No. 1289107

However, the tamper-preventing screw device according to the above prior art has the following problems. In other words, it takes labor and cost to form a detachable tool engaging portion for a screw tool having a special form as described above, and the screw tool has various thicknesses depending on its application, installation location, and the like. Since it is necessary to have a sheath, length, etc., it takes a lot of trouble to individually form such a tool engaging / detaching tool engaging portion for screws having various thicknesses, lengths, etc. And costs are required. Further, in order to individually provide the screw tool attaching / detaching tool that can be engaged with the screw tool attaching / detaching tool engaging portion, a great amount of labor and cost are required.

Furthermore, it may be necessary to remove the tamper-proof screw tool for a legitimate purpose, for example, when the license plate is replaced with a change in the registration number of the automobile. Therefore, it is also necessary to provide a detachable tool dedicated to the tamper-proof screw tool that can be engaged with a detachable tool engagement portion for a screw tool having a special form. As a result, if a detachable tool dedicated to the tamper-preventing screw tool is widely provided, removal of the tamper-preventing screw tool for an unauthorized purpose cannot be sufficiently prevented. Therefore, in order to sufficiently prevent the tamper-proof screw tool from being removed, it is necessary to provide a tamper-proof screw tool provided with a screw tool attachment / detachment tool engaging portion having a new special form, In addition, a screw tool detachable tool having a new form that can be engaged with the screw tool detachable tool engaging portion must also be provided.

Accordingly, a first problem to be solved by the present invention is a fixing device using a screw tool for preventing removal for an unauthorized purpose, the first screw tool, and the first screw tool. Removable tool engagement for a screw tool having various different special forms, with respect to a fixing device comprising a cover body covering the head and a second screw tool for coupling the lid to the first screw tool It is providing the fixing device which can use together the screw tool which has a part.

In addition, the cover member that covers the head of the screw device according to the conventional technique has the following problems. That is, the cover member is provided with a recess for engaging a tool for attaching / detaching a screw tool (see, for example, Patent Document 1 above), or a large force is required to pull out the pin (for example, , See the above-mentioned Patent Document 2.) Since it is difficult to remove the cover member attached to the head of the screw tool, it is suitable for preventing the screw tool from being removed for an unauthorized purpose. Even if it is necessary to remove the screw tool for a legitimate purpose, it becomes difficult to remove the screw tool.

Accordingly, a second problem to be solved by the present invention is a fixing device using a screw tool for preventing removal for an unauthorized purpose, the first screw tool, and the first screw tool. With regard to a fixing device comprising a lid body that covers the head and a second screw tool for coupling the lid body to the first screw tool, if there is a legitimate purpose, this may be removed as necessary It is to provide a fixing device that can be used.

The present invention has been proposed to solve the above-described problems, and has the following configuration. Hereinafter, in order to assist in understanding the configuration of the present invention, numbers and symbols displayed in the drawings attached to the present application will be described together.

The fixing device (1) according to claim 1 is a fixing device using a screw tool for preventing removal for an unauthorized purpose, and includes a first screw tool (2) and a second screw tool (3). ) And a lid (4). The first screw tool (2) is a member for screwing onto the screw target (A), and is a screw tool larger in size than the second screw tool (3). The head of (2) is provided with a second screw tool engaging portion (2a) for engaging the second screw tool (3), and the outer periphery of the first screw tool (2). The surface is provided with a screw portion (2b) for screwing onto the screwed object (A). The second screw tool (3) is a member for coupling the lid (4) to the head of the first screw tool (2), and is smaller than the first screw tool (2). The second screw tool is a second screw tool for engaging with the second screw tool dedicated attachment / detachment tool (B) exclusively used for attaching / detaching the second screw tool (3). The screw tool dedicated attachment / detachment tool engaging portion (3a) is provided, and a screw portion for screwing the second screw tool engaging portion (2a) to the outer peripheral surface of the second screw tool (3). (3b) is provided. The lid (4) is a member for preventing the screw tool attaching / detaching tool from engaging with the head of the first screw tool (2), and has a first screw tool (2) inside thereof. ) Of the first screw tool for receiving the head of the first screw tool (2) is provided, and a lid is attached to the first screw tool (2) using the second screw tool (3). A cylindrical member having a top surface (4e) sandwiched between the upper surface of the head of the first screw tool (2) and the lower surface of the head of the second screw tool (3) when (4) is coupled. The second screw tool insertion hole (4b) for inserting the second screw tool (3) into the top surface (4e) connected to the head accommodation space (4a) of the first screw tool. ), And the outer peripheral surface of the lid (4) is a screw tool attaching / detaching tool engagement preventing surface (4c), and the screw tool attaching / detaching tool engagement preventing surface (4c) is a lid ( Stenosis along the axial direction of 4) It has become the smooth surface with has a shape.

The fixing device (1) according to claim 2 is the fixing device according to claim 1, wherein the nominal length of the second screw tool (3) is that of the second screw tool engaging portion (2a). It is formed longer than the sum of the depth and the thickness of the top surface (4e) of the lid (4).

The fixing device (1) according to claim 3 is the fixing device according to claim 1 or 2, wherein the second screw tool (3) is inserted into the second screw tool insertion hole (4b) in the lid (4). ) Is inserted, a head accommodation space (4d) for the second screw tool for receiving the head of the second screw tool (3) is provided.

A fixing device (1) according to a fourth aspect is the fixing device according to any one of the first to third aspects, wherein the inner peripheral surface of the head accommodation space (4a) of the first screw tool is a first one. When the head of the first screw tool (2) is housed in the head housing space (4a) of the first screw tool, the outer peripheral surface of the head of the first screw tool (2) is completely covered. Is formed.

Since the fixing device (1) according to the present invention is configured as described above, the following effects can be achieved.

First, the fixing device (1) according to claim 1 covers the head (1) of the first screw tool (2) with the lid (4), and uses the second screw tool (3) to mount the first screw tool (2). By connecting to the head of the first screw tool (2), a generally provided screw tool attaching / detaching tool, such as a spanner, is engaged with the head of the first screw tool (2). Therefore, it is impossible to remove the first screw tool (1). Moreover, since the outer peripheral surface of the lid (4) is the screw tool attaching / detaching tool engagement preventing surface (4c), the screw tool attaching / detaching tool cannot be engaged with the outer peripheral surface.

In particular, according to the fixing device (1) according to claim 2, the nominal length of the second screw tool (3) is determined by the depth of the second screw tool engaging portion (2a) and the lid (4). Since the top surface (4e) is formed longer than the sum of the thicknesses, when the lid (4) is coupled to the first screw tool (2) using the second screw tool (3), The surface (4e) is sandwiched between the upper surface of the head of the first screw tool (2) and the lower surface of the head of the second screw tool (3) with a space. Then, even if the screw tool attaching / detaching tool is engaged with the screw tool attaching / detaching tool engagement preventing surface (4c) and the cover body (4) can be rotated, the cover body (4) is It is merely idle on the outer peripheral surface of the head of the first screw tool (1), and the head of the first screw tool (1) cannot be rotated and cannot be removed.

A second screw tool for engaging with a second screw tool dedicated attachment / detachment tool (B) used exclusively for attaching / detaching the second screw tool (3) to the head of the second screw tool (3). Since the dedicated attaching / detaching tool engaging portion (3a) is provided, the generally provided screw attaching / detaching tool cannot be engaged with the second attaching / detaching tool engaging portion (3a). The second screw (3) cannot be rotated and removed.

And as the 2nd screw tool (3), the various screw tools which provided the attachment / detachment tool engaging part for screw tools which has a special form in the head can be used. Then, the first screw tool (2) is for engaging the second screw tool (3) without providing a screw tool attaching / detaching tool engaging portion having various special forms on the head. If only the second screw engaging portion (2a) is provided, screw tools having various thicknesses and lengths can be used according to the application. In addition, even if the first screw tool (2) has any thickness, length, etc., if the second screw tool (3) having a specific thickness, length, etc. is used, one type is used. The attachment / detachment can be performed only with the second attachment / detachment tool (B) dedicated to the screw tool. Then, it is possible to engage the screw tool having various thicknesses, lengths, and the like with great effort and cost for forming the screw tool dedicated attachment / detachment tool engaging portion and the screw tool dedicated attachment / detachment tool engaging portion. It is possible to save a great amount of labor and cost for individually providing a removable screw tool.

Even if the second screw tool dedicated attachment / detachment tool (B) adapted to the specific second screw tool dedicated attachment / detachment tool engaging portion (3a) has come to be widely provided, it has a different special form. By using the screw tool provided with the second screw tool dedicated attachment / detachment tool engaging portion (3a) as the second screw tool (3), it is possible to sufficiently prevent the fixing device (1) from being removed for an unauthorized purpose. It can be done.

Therefore, the fixing device (1) is a fixing device using a screw tool for preventing removal for an unauthorized purpose, and the first screw tool and a lid that covers the head of the first screw tool. And a fixing device comprising a second screw tool for coupling the lid to the first screw tool, and a screw tool having an attaching / detaching tool engaging portion for a screw tool having various different special forms. The first problem to be solved by the present invention of providing a fixing device that can be used in combination can be solved.

Further, by using the second screw tool dedicated attachment / detachment tool (B), the second screw tool (3) is removed from the head of the first screw tool (2), and the lid (4) is removed from the first screw tool (2). If it removes from the head of a screw tool (2), a 1st screw tool (2) can be removed from a screwing target object (A). That is, the fixing device (1) is suitable for preventing removal for an unauthorized purpose, and when it is necessary to remove it for a legitimate purpose, it can be easily removed. .

Therefore, a fixing device using a screw tool for preventing removal for an unauthorized purpose, the first screw tool, a lid covering the head of the first screw tool, and the first screw An object of the present invention is to provide a fixing device comprising a second screw tool for coupling the lid to a tool, and to provide a fixing device that can be removed if necessary for a legitimate purpose. The second problem to be solved can be solved.

By the way, when the second screw tool (3) is screwed to the first screw tool (2), the head of the second screw tool (3) protrudes from the upper surface of the lid (4). There is a possibility that a screw tool attaching / detaching tool such as pliers is engaged with the head, and the second screw tool (3) is removed. Moreover, there is a possibility that a person or an object may be caught on the head of the second screw tool (3), and there is a possibility that the aesthetics may be impaired.

On the other hand, since the fixing device (1) according to claim 3 is provided with the head accommodation space (4d) of the second screw tool in the lid (4), the first screw tool ( When the second screw tool (3) is screwed to 2), the head of the second screw tool (3) can be prevented from protruding from the upper surface of the lid (4). As a result, it is possible to reduce the risk that the screw tool attaching / detaching tool is engaged with the head and the second screw tool (3) is removed. At the same time, it is possible to reduce a possibility that a person or an object is caught on the head of the second screw tool (3), and it is possible to improve aesthetics, which is preferable.

Furthermore, some screw tools have various forms on their heads, such as those having a hexagonal shape when viewed from the top and those having a taper at the lower edge. Then, depending on the form of the head in the first screw tool (2), the outer peripheral surface of the head of the first screw tool (2) is exposed to the outside of the lid (4), and the first screw tool There is room for the screw tool attachment / detachment tool to be engaged in the gap formed between the head of (2) and the lid (4).

Therefore, in the fixing device (1) according to claim 4, the inner peripheral surface of the head accommodation space (4a) of the first screw tool is first in the head accommodation space (4a) of the first screw tool. Since the head of the first screw tool (2) is completely covered when the head of the screw tool (2) is accommodated, the first screw tool (2) The outer peripheral surface of the head is not exposed to the outside of the lid (4), and the screw tool attaching / detaching tool is engaged in the gap formed between the head of the first screw (2) and the lid (4). There is no room to be merged.

It is a figure explaining the use condition of the fixing device which concerns on one Embodiment of this invention. FIG. 2 is a partial cross-sectional view of FIG. 1. It is a top view of FIG. It is a figure explaining the decomposition | disassembly state of the fixing device which concerns on one Embodiment of this invention. FIG. 5 is a partial cross-sectional view of FIG. 4. FIG. 5 is a plan view of FIG. 4. It is the front view which showed the cover body in the fixing device which concerns on one Embodiment of this invention. FIG. 8 is a plan view of FIG. 7. FIG. 8 is a bottom view of FIG. 7. It is sectional drawing of FIG. It is a figure explaining the state which uses the cover which concerns on another embodiment of this invention. It is a figure explaining the state which uses the 1st screw tool which concerns on another embodiment of this invention.

Below, the structure of the fixing device which concerns on one Embodiment of this invention is demonstrated based on an accompanying drawing.

As shown in FIGS. 1 to 5, the fixing device (1) is a fixing device using a screw tool for preventing removal for an unauthorized purpose, and includes a first screw tool (2) and a second screw tool. The screw tool (3) and the lid (4).

As shown in FIGS. 1 to 6, the first screw tool (2) is, for example, used for screwing an object to be screwed (A) such as a car and a license plate. It is a member and is a screw tool larger than the second screw tool (3). The 1st screw tool (2) is provided with the 2nd screw tool engaging part (2a) for engaging the 2nd screw tool (3) in the head, The inner peripheral surface is provided with it. Is threaded. Moreover, the 1st screw tool (2) is provided with the thread part (2b) for screwing to the screwing target object (A) on the outer peripheral surface.

As shown in FIGS. 1 to 6, the second screw tool (3) is a member for coupling the lid (4) to the head of the first screw tool (2). The screw tool is smaller than the screw tool (2). The first screw tool (2) has a nominal length longer than the sum of the depth of the second screw tool engaging portion (2a) and the thickness of the top surface (4e) of the lid (4). Is preferred. The second screw tool (3) is exclusively used for the second screw tool for engaging the second screw tool dedicated attachment / detachment tool (B) exclusively used for attaching / detaching the second screw tool (3) to the head thereof. A detachable tool engaging portion (3a) is provided. In the figure, the second screw tool attaching / detaching tool engaging portion (3a) is a rice ball-shaped recess, but if it is a screw tool attaching / detaching tool engaging portion having various special forms, for example, a petal shape A recessed part etc. may be sufficient and it does not specifically limit to the form shown in figure. Moreover, the 2nd screw tool (3) is provided with the thread part (3b) for screwing to the 2nd screw tool engaging part (2a) on the outer peripheral surface.

As described above, as the second screw tool (3), a screw tool provided with a screw tool attaching / detaching tool engaging portion having various special forms on its head can be used. Then, the first screw tool (2) is for engaging the second screw tool (3) without providing a screw tool attaching / detaching tool engaging portion having various special forms on the head. If only the second screw engaging portion (2a) is provided, screw tools having various thicknesses and lengths can be used according to the application. In addition, even if the first screw tool (2) has any thickness, length, etc., if the second screw tool (3) having a specific thickness, length, etc. is used, one type is used. It is possible to cope with only the second screw tool dedicated attachment / detachment tool (B). Then, it is possible to engage the screw tool having various thicknesses, lengths, and the like with great effort and cost for forming the screw tool dedicated attachment / detachment tool engaging portion and the screw tool dedicated attachment / detachment tool engaging portion. It is possible to save a great amount of labor and cost for individually providing a removable screw tool.

Even if the second screw tool dedicated attachment / detachment tool (B) adapted to the specific second screw tool dedicated attachment / detachment tool engaging portion (3a) has come to be widely provided, it has a different special form. By using the screw tool provided with the second screw tool dedicated attachment / detachment tool engaging portion (3a) as the second screw tool (3), it is possible to sufficiently prevent the fixing device (1) from being removed for an unauthorized purpose. can do.

As shown in FIGS. 1 to 10, the lid (4) is a member for preventing the screw tool attaching / detaching tool from engaging with the head of the first screw tool (2). A head housing space (4a) for the first screw tool for housing the head of the first screw tool (2) is provided inside, and the first screw tool (3) is used to make the first The top surface sandwiched between the upper surface of the head of the first screw tool (2) and the lower surface of the head of the second screw tool (3) when the lid (4) is coupled to the screw tool (2) of It is a cylindrical member which has (4e). The lid (4) has an inner peripheral surface of the head accommodation space (4a) of the first screw tool and the head screw accommodation space (4a) of the first screw tool in the first screw tool (2). When the head is accommodated, it is preferable to form it so as to completely cover the head outer peripheral surface of the first screw tool (2). For example, as the first screw tool (2), in the case of using a screw tool that has a collar portion at the head and the upper surface of the collar portion is an inclined surface, The lower end portion of the inner peripheral surface of the head housing space (4a) is formed so as to expand toward the outer peripheral surface direction of the lid (4).

The top surface (4e) of the lid (4) is connected to the head accommodation space (4a) of the first screw tool and is inserted through the end of the second screw tool (3). The screw tool insertion hole (4b) is drilled. In the second screw tool insertion hole (4b), the second screw tool (3) is inserted into the second screw tool (3) on the side where the second screw tool (3) is inserted. A head accommodating space (4d) is provided. Specifically, the second screw tool insertion hole (4b) has an inner peripheral surface on the insertion side of the second screw tool (3) that extends toward the outer peripheral surface of the lid (4), thereby A head housing space (4d) of the screw tool is formed.

The outer peripheral surface of the lid (4) is a screw tool attaching / detaching tool engagement preventing surface (4c), and the screw tool attaching / detaching tool engagement preventing surface (4c) is an upper part from the lower part of the lid (4). It has a shape that is constricted along the axial direction and has a smooth surface.

The above is the description of the structure of the fixing device according to the embodiment of the present invention. Below, the usage aspect of the fixing device which concerns on one Embodiment of this invention is demonstrated based on an accompanying drawing.

As shown in FIGS. 1 to 3, the user first screws the screw portion (2b) and attaches the first screw tool (2) to the screwed object (A). Next, the user accommodates the head of the first screw tool (2) in the head accommodation space (4a) of the first screw tool, and the head of the first screw tool (2). Put the lid (4) on the part. Then, the user inserts the second screw tool (3) into the second screw tool insertion hole (4b), and inserts the second screw tool (3) into the second screw tool engaging portion (2a). The lid body (4) is coupled to the first screw tool (2) by engaging.

If it does so, since it becomes impossible to engage this with the head of the 1st screw tool (2), and to attach this generally provided screw tool attachment / detachment tools, such as a spanner, the 1st screw tool ( 1) cannot be removed. Moreover, since the outer peripheral surface of the lid (4) is the screw tool attaching / detaching tool engagement preventing surface (4c), the screw tool attaching / detaching tool cannot be engaged with the outer peripheral surface.

The nominal length of the second screw tool (3) is longer than the sum of the depth of the second screw tool engaging portion (2a) and the thickness of the top surface (4e) of the lid (4). Then, when the lid (4) is coupled to the first screw tool (2) using the second screw tool (3), the top surface (4e) is attached to the first screw tool (2). It will be sandwiched between the upper surface of the head and the lower surface of the head of the second screw tool (3) with a space. Therefore, even if the screw tool attaching / detaching tool is engaged with the screw tool attaching / detaching tool engagement preventing surface (4c) and the cover body (4) can be rotated, the cover body (4) is It is merely idle on the outer peripheral surface of the head of the first screw tool (1), and the head of the first screw tool (1) cannot be rotated and cannot be removed.

In addition, since the second screw tool dedicated attachment / detachment tool engaging portion (3a) is provided at the head of the second screw tool (3), the generally provided screw tool attachment / detachment tool has the second function. It cannot be engaged with the screw tool exclusive attachment / detachment tool engaging portion (3a), and the second screw tool (3) cannot be rotated and removed.

Further, since the lid (4) is provided with a head accommodation space (4d) for the second screw tool, the second screw tool (3) is screwed onto the first screw tool (2). In this case, the head of the second screw tool (3) can be prevented from protruding from the upper surface of the lid (4). If it does so, fixing device (1) will reduce the possibility that the attachment or detachment tool for screw tools will be engaged with the head of the 2nd screw tool (3), and the 2nd screw tool (3) will be removed. be able to. At the same time, it is possible to reduce a possibility that a person or an object is caught on the head, and it is possible to improve aesthetics, which is preferable.

In addition, the lid (4) has an inner peripheral surface of the head accommodation space (4a) of the first screw tool within the head accommodation space (4a) of the first screw tool (2). ), The outer peripheral surface of the head of the first screw tool (2) is completely covered.

As shown in FIG. 11, for example, when using a screw tool having a collar portion at the head thereof and the upper surface of the collar portion being an inclined surface as the first screw tool (2). When the bottom surface of the lid body (4) is formed in a flat shape, the bottom surface of the lid body (4) is caught on the top surface of the flange, and the outer peripheral surface of the head of the first screw tool (2) is There is room for the screw tool attachment / detachment tool to be engaged by being exposed to the outside of the lid (4). Therefore, in such a case, the lower end portion of the inner peripheral surface of the head accommodation space (4a) of the first screw tool is formed so as to expand toward the outer peripheral surface direction of the lid (4). Use the lid (4). If it does so, the head outer peripheral surface of the 1st screw tool (2) will not be exposed to the exterior of a lid (4), and it will become between a head of the 1st screw tool (2) and a lid (4). Thus, there is no room for the screw tool attaching / detaching tool to be engaged in the gap generated in the step.

In addition, as shown in FIG. 12, even when the head has a hexagonal shape in a plan view, the first screw tool (2) is used together with the washer (C). The head outer space of the first screw tool (2) can be completely covered by the head accommodation space (4a) of the first screw tool. Therefore, the cover body (4) provided with the head accommodation space (4a) of the 1st screw tool of the above aspects is rich in versatility.

4 to 6, the user uses the second screw tool dedicated attachment / detachment tool (B) to attach the second screw tool (3) to the first screw tool (2). If it removes from a head and removes a cover body (4) from the head of a 1st screw tool (2), a 1st screw tool (2) can be removed from a screwing target object (A). Therefore, the fixing device (1) is suitable for preventing removal for an unauthorized purpose, and when it is necessary to remove it for a legitimate purpose, it can be easily removed. .

DESCRIPTION OF SYMBOLS 1 Fixing device 2 1st screw tool 2a 2nd screw tool engaging part 2b Screw part 3 2nd screw tool 3a 2nd screw tool exclusive attachment / detachment tool engaging part 3b Screw part 4 Lid 4a 1st screw Tool housing space 4b Second screw tool insertion hole 4c Screw tool attachment / detachment tool engagement prevention surface 4d Second screw tool head housing space 4e Top surface A Screwed object B Dedicated to second screw tool Detachable tool C Washer

Claims (4)

A fixing device using a screw for preventing removal due to an unauthorized purpose, the fixing device including a first screw, a second screw, and a lid, the first screw Is a member for screwing onto the object to be screwed, and is a screw tool having a larger size than the second screw tool, and the second screw tool is attached to the head of the first screw tool. A second screw tool engaging portion for engagement is provided, and a screw portion for screwing the screw target object is provided on the outer peripheral surface of the first screw tool, The second screw tool is a member for coupling the lid to the head of the first screw tool, the screw tool being smaller than the first screw tool, and the second screw tool. A head part of the screw tool is provided with a second screw tool dedicated attaching / detaching tool engaging portion for engaging with a second screw tool dedicated attaching / detaching tool exclusively used for attaching / detaching the second screw tool. Further, a screw portion for screwing onto the second screw tool engaging portion is provided on the outer peripheral surface of the second screw tool, and the lid body is a head portion of the first screw tool. A member for preventing the screw tool attachment / detachment tool from engaging with the head, and the head of the first screw tool for accommodating the head of the first screw tool inside the lid. An accommodation space is provided, and when the lid is coupled to the first screw tool using the second screw tool, the upper surface of the head of the first screw tool and the second screw tool A cylindrical member having a top surface sandwiched between the lower surface of the head, and the second screw device is inserted into the top surface so as to be connected to the head accommodation space of the first screw device. A second screw tool insertion hole is provided, and the outer peripheral surface of the lid is a screw tool attachment / detachment tool engagement prevention surface, and the screw tool attachment / detachment tool engagement prevention surface is the lid. Stenosis along the body axis It fixing device, characterized in that has a smooth surface with are shaped. 2. The fixing device according to claim 1, wherein a nominal length of the second screw tool is longer than a sum of a depth of the second screw tool engaging portion and a thickness of a top surface of the lid. A fixing device which is formed. 3. The fixing device according to claim 1, wherein a head of the second screw tool is accommodated on a side where the second screw tool is inserted in the second screw tool insertion hole of the lid. A fixing device characterized in that a head accommodation space for a second screw tool is provided. 4. The fixing device according to claim 1, wherein an inner peripheral surface of a head accommodation space of the first screw tool is placed in the head accommodation space of the first screw tool. A fixing device formed so as to completely cover the outer peripheral surface of the head of the first screw when the head of the screw of the first screw is received.