JP5087301B2 - Sealing tool - Google Patents

Description

  The present invention mainly relates to a sealing screw that keeps an openable and closable measuring instrument box that protects a trading meter such as a watt hour meter in a closed state. The present invention relates to a sealing tool to be attached for the purpose of prevention.

As a conventional sealing tool, as disclosed in Japanese Patent Laid-Open No. 9-50240, a screw head of a sealing screw that keeps an instrument box protecting a measuring instrument such as a watt hour meter closed, Fit a sealing tool body with an insertion hole penetrating in the horizontal direction, and further align the insertion hole of the sealing tool body with the difference hole penetrating in the horizontal direction with respect to the screw head, and insert a straight pin or the like By inserting the part, the instrument box is sealed in a closed state. As a result, if an attempt is made to tamper open the instrument box and an excessive deformation force is applied to the sealing tool, the sealing tool is destroyed and an abnormality can be confirmed from the outside.
Japanese Patent Laid-Open No. 9-50240

  As described above, many of the conventional sealing tools are ones in which insertion portions such as straight pins are continuously inserted into the insertion holes of the sealing tool body and the screw holes of the sealing screw. It was. With respect to such an insertion part, the hole diameter of the insertion hole of the sealing tool body is formed slightly smaller than the diameter of the insertion part, and when this insertion part is inserted into the insertion hole, The insertion position of the insertion part is maintained by frictional resistance from the periphery, and the tip of the insertion part is inserted into the screw hole of the screw head of the sealing screw, thereby maintaining the instrument box in a closed state. It was. In the case of the sealing tool as described above, when inserting the insertion part into the screw hole, normally, one end of the insertion part in the longitudinal direction is strongly pressed with a finger to be inserted into the insertion hole of the sealing tool body. It was a thing. For this reason, the end face in the longitudinal direction of the insertion part has a pin-like form, so the area that the finger hits is small and very difficult to push in. In many cases, after the insertion part is inserted into the screw hole, the end of the insertion part on the side opposite to the insertion side protrudes from the sealing tool body. ing. In such a state, it is easy to pick out the protruding part of the insertion part with a tool such as a pliers and sandwich the object and extract it from the sealing tool body. In the past, there have been many acts of misusing the instrument box to open the instrument box and then returning the inserted part to the original insertion hole. Also, even when the insertion part is completely inserted into the sealing tool body, the insertion part is positioned on the sealing tool body by frictional resistance. There have also been reports of cases in which the insertion part gradually comes out of the screw head as time passes after the sealing tool is attached due to continuous vibration transmission to the sealing tool due to various factors.

  In view of the actual situation as described above, the present invention is easy to attach to the screw head of a sealing screw of an instrument box that protects a trading instrument represented by a watt hour meter and the like, and further, the instrument box is opened undestructively. It is an object of the present invention to provide a sealing tool that can easily and reliably detect fraudulent acts on trading instruments by making the structure almost impossible.

The present invention relates to a sealing screw fitting body that fits on a screw head of a sealing screw that keeps an openable / closable instrument box in a closed state, and is engaged with the sealing screw fitting body and is inserted into a differential hole on a side surface of the screw head. The sealing screw fitting body is arranged on the screw head receiving side of the cover portion covering the entire side surface and the top surface of the screw head, and the screw head is fitted. A screw head fitting portion, and a screw head fitting portion that is inserted into the cover portion at the screw head fitting portion, and a region in the cover portion adjacent to the screw head fitting portion receives the insertion space portion. The cover portion has a locked portion at one side facing the receiving space portion, and the portion facing the screw head difference hole in the cover portion has a receiving portion. The insertion port of the insertion body that communicates the space and the outside, and the screw head support of the insertion port protrudes from the inner periphery of the insertion port into the insertion port. And a movement restricting portion that blocks the opening on the side, the insertion body includes an insertion portion that is inserted into a difference hole of the screw head, and a pressing portion that cantileveres one end portion in the longitudinal direction of the insertion portion. The pushing portion is formed wider than the insertion portion, and the end surface on the side facing the screw head receiving side is in contact with the top surface of the movement restricting portion, and the insertion portion is The end face on the side orthogonal to the insertion direction is provided with a locking part that locks with the locked part, and on the screw head receiving side of the screw head of either the cover part or the pushing part, When the insertion portion and the insertion body are in a state of being accommodated in the receiving space portion, a blocking portion is provided that blocks the locking portion between the locking portion and the locked portion from the outside of the receiving space portion. And

According to the present invention, when the sealing tool is attached to the screw head of the sealing screw, the insertion portion of the insertion body smoothly enters until the insertion portion is inserted into the screw hole of the screw head. On the other hand, when the insertion body enters the receiving space portion until the insertion portion is completely inserted, the locking portion of the insertion body is locked to the locked portion of the sealing screw fitting body. As a result, it is not necessary to push the plug strongly with a finger when inserting the plug, and when the plug is inserted into the plug hole, the locking portion and the locked portion are locked, so that the plug is inserted. Since the body is positioned securely in the receiving space, the plug body does not fall out of the insertion port of the seal screw fitting body, and as a result, the instrument box that misuses the plug body is surely tampered with. Can be prevented. In addition, since the end surface on the receiving side of the screw head of the push-in portion comes into contact with the end surface on the top surface side of the movement restricting portion, the plug-in portion of the insertion body is connected to the screw head after the seal is installed. It keeps being inserted into the hole in a substantially constant direction. Thereby, a sealing tool which does not spoil a function as a sealing tool over a long period of time can be provided, without an insertion object pulling out from an acceptance space part unexpectedly. Furthermore, even if it is intended to release the locking portion between the locking portion of the insertion body and the locked portion of the sealing screw fitting body, when the insertion body is in the receiving space, the blocking portion As a result, the above-mentioned locking location is blocked from the outside of the receiving space portion, so that a precision tool or the like cannot reach the locking location. Therefore, it is practically impossible to remove the plug from the receiving space without destroying the sealing member unless the blocking part can be released without removing the blocking part by some means. Thus, unauthorized opening of the instrument box can be prevented more reliably .

Hereinafter, embodiments of a sealing tool of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a use state of the sealing tool of the present invention, FIGS. 2 (a) and 2 (b) are explanatory views showing the mounting procedure of the sealing tool of the present invention, and FIG. FIG. 3 is a plan view of the sealing device of the present invention, FIG. 3B is a longitudinal sectional view, and FIG. 3C is a bottom view.
As shown in FIG. 1, this sealing tool is composed of a sealing screw fitting body 1 that fits into a screw head 20 of a sealing screw, and an insertion body 12 that is inserted into a differential hole 21 of the screw head 20. It is attached to the screw head 20 of the sealing screw that maintains the closed state of the instrument box 22 that is formed so as to be openable and closable through a substantially symmetrical bowl-shaped molded part on the front side and the back side. is there. Here, the sealing screw of the instrument box 22 to which the present embodiment is applied is such that the flange 23 projecting downward from the lower end in the figure of the instrument box 22 extends horizontally from the front side to the back side. Thus, when the instrument box 22 is closed, the screw head 20 protrudes to the front side. The screw head 20 has a substantially cylindrical shape with a tool insertion groove on the front side, and the above-described differential hole 21 is orthogonal to the direction in which the sealing screw passes through the peripheral wall surface of the screw head 20. The insertion pin (insertion portion) 19 of the insertion body 12 is inserted into the insertion hole 21 through the insertion hole 21, so that the sealing tool can be removed from the screw head 20 of the sealing screw. It is impossible to escape from destruction.
In describing the present embodiment, the front side, front and rear, right and left directions are defined based on the drawings. Moreover, this embodiment demonstrates what applied this sealing tool to the meter box 22 which protects a watt-hour meter.

Next, a specific configuration of the sealing tool according to the present invention will be described.
First, as shown in FIG. 2 (a), the sealing screw fitting 1 is composed of cover parts 3, 4, 5, 6, 10 and a fitting part 2, and the cover parts 3, 4, 5, 6, 10 are When viewed from the front, it has a substantially rectangular shape, and each side wall portion (shown in the figure) hangs vertically from each edge of the front side roof portion 10 and the four sides of the front side roof portion 10 (see FIG. 3B). (Referred to as front side wall part 3, left side wall part 4, rear side wall part 5, right side wall part 6, respectively) 3, 4, 5, and 6 on the basis of the direction, and the back side is open and covering parts 3, 4, 5, 6 and 10 are formed in a dome shape having a hollow receiving space S. The front side wall portion 3 of the cover portions 3, 4, 5, 6, 10 is provided with an insertion port 7 serving as an inlet for receiving the insertion body 12 in the receiving space portion S. The insertion port 7 has a region (vertical hole) 7c on the screw head receiving side H in the cover portions 3, 4, 5, 6, 10 protruding from the left wall portion 4 and the right wall portion 6 in the horizontal direction. Opposite stepped wall portions (movement restricting portions) 3c and 3d are provided. By these stepped wall portions (movement restricting portions) 3c and 3d, horizontal holes 7a and 7b which are long in the horizontal direction are arranged at two positions on the front side and the back side of the front side wall portion 3 with a gap therebetween, The middle part of each horizontal hole 7a, 7b is connected by the vertical hole 7c in the vertical direction and is continuous. For example, it has a shape like a Chinese character “Kou”. Furthermore, the lateral hole 7a arranged on the front side roof portion 10 side of the insertion port 7 has a hole edge on the side toward the left side wall portion 4 and the right side wall portion 6 extending partway. The part 3 is provided so as to leave a part of the wall part through the vertical hole 7c on both the left and right sides. About the wall surface on the side facing the receiving space S in the left and right wall portions other than the insertion port 7, the engaged portions 3a, which are engaged with engaging claws 15a, 15b of the insertion body 12 described later, 3b. Moreover, the location close | similar to the rear side wall part 5 of the front side roof part 10 has the screw | thread head fitting part 2 which makes | forms the cylindrical shape enclosed by the surrounding wall of the vertical axis direction. The screw head fitting portion 2 hangs down from the side facing the receiving space portion S of the front roof portion 10 to the screw head receiving side H, and a part of the peripheral wall is connected to the rear side wall portion 5. The region surrounded by the peripheral wall has a fitting hole 2a that fits into the screw head 20 of the sealing screw. In addition, a part of the peripheral wall surrounding the fitting hole 2a on the side close to the insertion port 7 is formed thicker than the other part, and the peripheral part penetrates the peripheral wall in the horizontal direction. An insertion hole 8a is provided. On the other hand, a recess 8b having a concave shape is provided at a position facing the insertion hole 8b on the inner surface side of the peripheral wall facing the fitting hole 2a of the peripheral wall, and the insertion pin (insertion portion) 19 of the insertion body 12 is provided. The distal end enters and the distal end of the insertion pin (insertion portion) 19 is locked. In addition, the receiving space portion is located at the side of the wall surface facing the receiving space portion S of the left side wall portion 4 and the right side wall portion 6 of the covering portions 3, 4, 5, 6, 10 on the side close to the front side wall portion 3. Locked pieces (locked portions) 9a and 9b that are inclined in a direction in which the intervals gradually narrow from the front wall portion 3 side to the rear wall portion 5 side of S are disposed. The distal ends of the stop pieces (locked portions) 9a and 9b have elasticity that works like a leaf spring, and thereby elastically deform or return elastically when the insertion body 12 is pushed into the receiving space portion S. .
In addition, the code | symbol 11 shown in FIG. 1 is a stamp which shows the manufacture date etc. of this sealing tool.

The insertion body 12 is composed of an elongated rod-like insertion pin (insertion portion) 19 and a pushing portion 24 that cantilever one end portion in the longitudinal direction of the insertion pin (insertion portion) 19. The insertion pin (insertion portion) 19 has a diameter slightly smaller than the diameter of the insertion hole 21 of the screw head 20 of the sealing screw, and after the sealing tool is attached to the screw head 20 of the sealing screw. Can insert and remove the insertion pin (insertion portion) 19 in the insertion hole 21 freely. This is because the person concerned can easily remove the plug 12 by destroying the sealing tool, for example, when performing maintenance on the watt-hour meter.
From here, the state in which the present sealing tool is already attached to the screw head 20 of the sealing screw, that is, the state in which the insertion body 12 is housed in the receiving space S of the sealing screw fitting 1 is used as a reference. The detailed configuration of the insertion body 12 will be described below.
The push-in part 24 is integrally connected to the block 13 that cantilever one end in the longitudinal direction of the insertion pin (insertion part) 19 and the side facing the front-side roof part 10 in the block 13. It consists of a movement restricting plate 14 and a back side blocking plate (blocking portion) 25 integrally connected to the side of the block 13 facing the screw head receiving side H. And when FIG.4 (d) looks at the insertion body 12 by making the side which approaches the front side wall part 3 into the front, it has made the substantially same shape as the insertion port 7 (the shape of a Chinese character), As a result, the portion P of the front side movement restricting plate 14 that protrudes in the horizontal direction from the block 13 is related to the front end surfaces (top surfaces of the movement restricting portions) Q of the front side wall portions (engaged portions) 3a, 3b. Thus, the plug 12 is prevented from coming out from the receiving space S in the vertical direction (direction toward the screw head receiving side H). Further, as shown in FIGS. 4A and 4B, the intermediate portion on the side close to the left wall portion 4 and the side close to the right wall portion 6 of the block 13 has a constricted shape when viewed from the front or the back. The constricted portions serve as locking portions 18a and 18b that are locked to the tips of the locked pieces (locked portions) 9a and 9b. Next, the front side movement restricting plate 14 has a board 14a projecting from the block 13 toward the left side wall part 4 and the right side wall part 6, respectively, and ends of the board 14a on the left side wall part 4 side and the right side wall part 6 side. The engaging claw portions 15 a and 15 b project from the portion toward the rear side wall portion 5, and the front end portions of the engaging claw portions 15 a and 15 b are the diameters of the insertion pins (insertion portions) 19. It is elastically deformed and elastically restored by being formed in the same narrow width. Further, the engaging claws 15a and 15b have tip claws having inclined portions gradually expanding from the rear side wall 5 side toward the front side wall 3 side at the tip part protruding toward the rear side wall part 5 side. 16a and 16b, and the end edges of the front claw portions 16a and 16b facing the left wall portion 4 and the right wall portion 6 face the left wall portion 4 and the right wall portion 6 of the substrate 14a. It protrudes further to the side toward the left side wall 4 and the right side wall 6 than the end face on the side to be received, and by this protruding part, the receiving space in the wall at the left and right side end of the lateral hole 7a of the front side wall 3 It can engage with the side (engaged part) 3a, 3b facing the part S. Further, on the end faces of the engaging claws 15a, 15b facing the left wall 4 and the right wall 6, the front claws 16a, 16b are located closer to the front wall 3 than the front claws 16a, 16b. And auxiliary claw portions 17a and 17b having inclined portions having substantially the same inclination as the above.

  Next, as shown in FIGS. 4B, 4C, and 4D, the back side blocking plate (blocking portion) 25 is a plate-like member having a substantially square shape, and the insertion body 12 is formed in the receiving space portion S. As shown in FIG. 1 (c), the rear side blocking plate (blocking portion) 25 is formed between the locking portions 18a and 18b of the block 13 and the locked pieces (locked portions) 9a and 9b. The screw head receiving side H of the cover portions 3, 4, 5, 6 and 10 is blocked by the portion to be locked. Thereby, when this sealing tool is attached to the screw head 20 of the sealing screw, the back side (screw head receiving side H) of the sealing tool is usually exposed to the outside (see FIG. 1C). ), By the back side blocking plate (blocking portion) 25, the locking points between the locked pieces (locked portions) 9a, 9b and the locking portions 18a, 18b are not exposed to the outside of the sealing device, From the outside of the sealing device, the locking portion cannot be released.

Based on FIG. 5 (a) (b) (c) (d), the procedure for attaching the sealing tool of the present invention and the action against unauthorized opening of the instrument box 22 will be described below.
First, the procedure for attaching the sealing tool will be described. As a first procedure, as shown in FIG. 5A, the insertion body 12 is pushed into the receiving space S from the insertion port 7 of the sealing screw fitting body 1. Sometimes, the insertion body 12 is inclined to the front end claw portions 16a and 16b by pressing the inclined portions of the front end claw portions 16a and 16b against the wall surface of the peripheral edge of the insertion port 7 on the side facing the outside of the front side wall portion 3. The tip of each of the engaging claws 15a and 15b is elastically deformed inwardly while gradually sliding into the insertion port 7 along the portion. Further, at the stage where the front end claw portions 16a and 16b pass through the front side wall portion 3 and enter the receiving space portion S, the front end portions of the engagement claw portions 15a and 15b are elastically restored to the original state, and the front end claw The protruding edges of the portions 16 a and 16 b are engaged with the engaged portions 3 a and 3 b of the front side wall portion 3 in a snap manner. At this time, at the stage of insertion in which only the front end claw portions 16a and 16b are engaged with the engaged portions 3a and 3b, as described above, the front end portions of the engagement claw portions 15a and 15b are elastically deformed. The insert 12 can be arbitrarily swung in both directions on the left side wall 4 side or the right side wall 6 side. In the unlikely event, the tip of the insertion pin (insertion part) 19 is connected to the screw head fitting part 2. If it does not coincide with the insertion hole 8a, the insertion position of the insertion pin (insertion portion) 19 can be finely adjusted as appropriate (see also FIG. 2).
As a second procedure, as shown in FIG. 5B, the screw head fitting portion 2 of the sealing screw fitting 1 is fitted into the screw head 20 of the sealing screw of the instrument box 22 in the closed state (FIG. 2). See also).
As a third procedure, as shown in FIG. 5C, the sealing tool is appropriately rotated in the horizontal direction around the screw head 20 of the sealing screw, and the tip of the insertion pin (insertion portion) 19 is screwed into the sealing screw. Positioning is performed so as to coincide with the insertion hole 21 of the head 20, and when the distal end of the insertion pin (insertion part) 19 and the insertion hole 21 coincide with each other, the pushing portion 24 enters the receiving space portion S The auxiliary claw portions 17a and 17b of the engaging claw portions 15a and 15b are engaged with the engaged portions 3a and 3b of the front side wall portion 3 this time. Since the portions where the auxiliary claw portions 17a and 17b in the engaging claw portions 15a and 15b are hardly elastically deformed at the stage of the insertion, the insertion body 12 can be removed from the insertion port 7 except for a method of destroying the sealing tool. The receiving space S cannot be pulled out to the outside.
As the fourth procedure, as shown in FIG. 5D, when the pushing portion 24 is pushed in until it completely enters the receiving space portion S, the tips of the pieces to be locked (locked portions) 9a and 9b are inserted into the plug 12. The block 13 is locked with the locking portions 18a and 18b, thereby completing the attachment of the sealing tool to the screw head 20 of the sealing screw.

Next, the action of the present sealing tool when resisting unauthorized opening of the instrument box 22 will be described below.
When attempting to open the instrument box 22 regardless of whether it is a related person or a non-related person, it is necessary to first release the locked state between the sealing screw fitting 1 and the plug 12 of the sealing tool. Specifically, this is to release the locking portions between the locking pieces (locked portions) 9a, 9b of the sealing screw fitting body 1 and the locking portions 18a, 18b of the insertion body 12. In order to actually release, for example, a precision tool such as a screwdriver or a cone must reach the receiving space portion S of the sealing screw fitting 1 so that the receiving space portion S can be opened only from the back side. It needs to reach inside. However, since the locking portion is closed by the back side blocking plate (blocking portion) 25 of the insertion body 12, it is difficult to insert a precision tool or the like into the receiving space portion S. For this reason, for example, using a precision tool of a type that sandwiches an object such as radio pliers or tweezers, bends so that any protruding end of the back side blocking plate (blocking portion) 25 is raised, When an attempt is made to create a gap into which a precision tool such as a separately prepared screwdriver or a cone is inserted, the insertion body 12 is accommodated in the receiving space S without a gap, so that the rear side blocking plate (blocking portion) 25 Along with the bending, the deformation force exerted on the other part of the sealing screw fitting 1 is applied to the entire sealing tool. As a result, cracks occur in each part of the sealing screw fitting body 1 or the insertion body 12, and the sealing tool cannot be restored, so that the abnormality of the instrument box 22 can be seen from the outside. Further, even if the back side blocking plate (blocking portion) 25 is skillfully lifted up by some means to secure a gap for inserting the precision tool into the receiving space portion S, the locked piece ( (Latched portion) 9a, 9b and the locking portions 18a, 18b are unlocked, and the auxiliary claw portions 17a, 17b are not locked to the front side wall portion 3 and are received through the insertion port 7. It is necessary to extract from the part S to the outside. However, the places where the auxiliary claw portions 17a and 17b are located are places where the engagement claw portions 15a and 15b hardly undergo elastic deformation, and therefore the engagement between the auxiliary claw portions 17a and 17b and the engaged portions 3a and 3b. Therefore, it is substantially impossible to pull out the insertion body 12 from the insertion port 7 while maintaining the shape of the sealing tool.

  The sealing device of the present invention is not limited to that of the above-described embodiment, and can be appropriately deformed in shape and size. For example, the insertion pin (insertion portion) 19 is inserted into the insertion hole 21 of the screw head 20. It may be like nails or screws. However, as for the pushing part 24, when inserting the insertion body 12 in the receiving space part S, what has a flat location which is easy to push with a finger is desirable. In addition, as in the present embodiment, if the end surface of the front side wall 3 of the pushing portion 24 and the insertion port 7 have substantially the same shape, the front side wall 3 is inserted into the insertion port 7 after the sealing tool is attached. And the pushing portion 24 are almost eliminated. Thereby, since it becomes impossible to pick out the insertion body 12 using a precision tool etc., the further defense with respect to unauthorized opening of the instrument box 22 can be aimed at. In addition, for the latched pieces (latched portions) 9a and 9b and the latching portions 18a and 18b, for example, the screw head fitting body 1 and the insertion body 12 are each provided with a pusher portion and latched. Although the shape is not particularly limited as in the case of the present invention, the leading ends of the pieces to be locked (locked portions) 9a and 9b are inclined toward the rear side wall portion 5 of the receiving space portion S as in the present embodiment. If the insertion body 12 enters the receiving space portion S, it is elastically deformed so that the respective distal end portions of the locked pieces (locked portions) 9a and 9b expand when the insertion body 12 enters the receiving space portion S. While the insertion space portion S of the insert 12 can be easily inserted, when the insertion body 12 is pulled out from the reception space portion S, the tips of the locking pieces (locked portions) 9a, 9b are locked to the locking portions 18a, 18b, the locked piece (locked part) 9a, 9b is not deformed any further, and the locking part is illegally released. It is possible to prevent more reliably. Further, the sealing screw fitting body 1 of the present embodiment opens the screw head receiving side H of the cover portions 3, 4, 5, 6, 10 including the receiving space portion S. Only the fitting hole 2a of the head 20 may be opened, and the receiving space portion S may be covered with a wall portion. Even in such a case, the wall portion plays the role of the rear-side blocking plate 25, and the locking points between the locked pieces (locked portions) 9a, 9b and the locking portions 18a, 18b are externally provided. Can be blocked.

(A) is a front view showing a state in the middle of attaching the sealing tool of the present invention to the screw head of the sealing screw, (b) is a front view showing a state after attaching the sealing tool, (C) is a rear view of (b). (A) is a perspective view of Fig.1 (a), and is a perspective view of FIG.1 (b). (A) is the longitudinal cross-sectional view which looked at the sealing screw fitting body of this invention from the front, (b) is the longitudinal cross-sectional view seen from the left side, (c) is the figure seen from the front side wall part side It is. (A) is the figure which looked at the insertion body of this invention from the front, (b) is the figure seen from the back, (c) is the figure seen from the left side, (d) is the difference It is the figure seen from the insertion pin side. (A) (c) (c) (d) is explanatory drawing which shows a sealing screw fitting body longitudinally about the procedure attached to the screw head of the sealing screw of the sealing tool of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal screw fitting body 2 Screw head fitting part 3, 4, 5, 6, 10 Cover part 3c, 3d Stepped wall part (movement control part)
7 Insert 9a, 9b Locked piece (locked part)
12 Insert 18a, 18b Locking part 19 Insertion pin (insertion part)
20 Screw head 21 Differential hole 22 Instrument box 24 Push-in part 25 Back side blocking plate (blocking part)
H Screw head receiving side P Overhanging part (end face of the pushing part facing the screw head receiving side)
Q Top surface of movement restriction section S Reception space section

Claims (1)

A sealing screw fitting body (1) that fits on a screw head (20) of a sealing screw that keeps the openable / closable instrument box (22) closed, and a screw head that is locked to the sealing screw fitting body (1) It is composed of an insertion body (12) that is inserted into a difference hole (21) on the side surface of (20),
The sealing screw fitting (1) includes a cover (3, 4, 5, 6, 10) covering the entire side surface and top surface of the screw head (20), and a cover (3,4, 5, 6). , 10) and a screw head fitting portion (2) that is arranged on the screw head receiving side (H) and that fits the screw head (20). ) In the cover (3, 4, 5, 6, 10) adjacent to the difference hole (21) of the screw head (20) that has entered the cover (3,4, 5, 6, 10). The region is provided with a receiving space (S) in which the insertion body (12) is accommodated, and one of the cover portions (3, 4, 5, 6, 10) facing the receiving space (S). The portion having the locked portion (9a, 9b) is located at the position of the screw portion (21) facing the screw head (20) in the cover portion (3, 4, 5, 6, 10). The receiving space (S) is connected to the outside. The insertion port (7) of the insertion body (12) and the screw head receiving side (H) of the insertion port (7) protruding from the inner peripheral edge of the insertion port (7) into the insertion port (7) ) And a movement restricting portion (3c, 3d) that blocks the opening of
The insertion body (12) includes an insertion portion (19) to be inserted into the insertion hole (21) of the screw head (20) and a pressing portion (cantilevered at one end in the longitudinal direction of the insertion portion (19)). 24), the pushing part (24) is formed wider than the insertion part (19), and the end face (P) on the side facing the screw head receiving side (H) is While being in contact with the top surface (Q) of the movement restricting portion (3c, 3d), it is locked to the locked portion (9a, 9b) on the end surface on the side orthogonal to the direction in which the insertion portion (19) is inserted. It has a locking part (18a, 18b),
On the screw head receiving side (H) of one of the screw heads (20) of the cover part (3, 4, 5, 6, 10) and the push-in part (24), an insert (12) is provided. When the receiving space portion (S) is in a state of being accommodated, the locking portion of the insertion portion (19), the locking portion (18a, 18b) and the locked portion (9a, 9b) is defined as the receiving space portion (S ) Is provided with a blocking portion (25) for blocking from the outside .