JPH0649814U - Tightening lock - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the joint work of each plate that constitutes a cabinet, etc. from the outside of the cabinet. [Structure] The buried case 10 is provided with a receiving hole 11 for receiving the head S ′ of the screw S and an operation hole 12. A fastener 20 is rotatably housed in the operation hole 12. By the rotation of the fastener 20,
The engaging surface 23a of the protrusion 23 abuts on the head S'of the screw S. The screw S is the operation hole 1 of the buried case 10.
2 will be temporarily drawn toward the establishment side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tightening and locking tool that jointly configures plate materials such as particle boards used for accommodating and mounting audio equipment, televisions, and the like to join the plate materials to each other. More specifically, the head of a tightening tool such as a screw embedded in the one plate to be joined and screwed into the other plate to be joined is received, and the received tightening tool is subjected to a predetermined operation. The present invention relates to the provision of a tightening and locking tool that joints both plate members by pulling in.

[0002]

[Prior art]

 Cabinets for storing and mounting audio equipment, televisions, etc. are often formed from a combination of plate materials such as particle boards from the viewpoints of such a lightweight cabinet and wood appearance of the cabinet. . However, if such a cabinet is assembled in a box shape in advance and provided to the user, the box-shaped and bulky cabinet causes various inconveniences in storage, transportation, etc., so that the cabinet usually constitutes the cabinet. Each plate is disassembled and stored, transported, etc.When assembling and installing the cabinet to the user, use a joint member that is provided in advance at the planned joining point of each plate. In many cases, the so-called knock down method is performed by joining the plate materials.

The tightening locking tool X shown in FIG. 9 to FIG. 11 has been conventionally used for jointing the respective plate materials constituting such a cabinet. This fastening device X has a receiving hole 101 for receiving a large-diameter head S'of a screw S screwed into an end of one plate P-1 to be jointed, and a receiving hole 101 in the same direction as the receiving hole 101. Provided in the operating hole 102 of the embedded case 100 which is in communication with the receiving hole 101 and which is adjacent to the receiving hole 101, and which extends in the circumferential direction of the shaft rod 103a and the shaft rod 103a. The projection 103b facing the opening side of the operation hole 102 of the embedded case 100, and further having the abutment surface 103c extending in the circumferential direction of the shaft rod 103a and inclined toward the opening side of the operation hole 102. And a fastener 103 having Therefore, according to this tightening locking tool X, the head of the expanded diameter of the screw S that receives the engaging surface 103c of the protrusion 103b in the receiving hole by rotating the axial rod 103a of the tightening tool 103. Since the engaging surface 103c is inclined toward the opening side of the operation hole 102, the screw S can be operated by the rotation of the shaft rod 103a. It will be temporarily pulled in toward the opening side of the hole 102. As a result, if a plate material P-2 to be jointed to the board material P-1 into which the screw S is screwed is embedded with the tightening locking tool X from one surface thereof, as shown in FIG. After the head S'of the screw S is received in the receiving hole 101, as shown in FIG. 11, the tightening tool 103c of the tightening locking tool X is inserted into the end thereof with a jig such as a screwdriver. By moving it, the head C ′ of the screw C is drawn into the receiving hole 101, and the plate material P-1 to which the screw S is fixed is drawn toward the plate material P-2 side. , P-2 can be jointed.

Further, the tightening lock Y shown in FIGS. 12 to 15 is another type of tightening lock conventionally used for jointing the respective plate materials constituting such a cabinet. This tightening / locking tool Y has an operation concave portion 201 for a jig such as a driver on one end surface, and has a large diameter head B of a bolt B screwed into the end of one plate member P-1 to be jointed. The cylindrical member 200 for opening a receiving hole 202 for receiving 'is accommodated in a support cylinder 203 having an opening corresponding to the receiving hole 202. The opening of the receiving hole 202 has a groove shape oriented in the circumferential direction of the columnar member 200, and one end thereof has a groove width large enough to receive the large diameter head portion B ′ of the bolt B. In addition, the groove width from the receiving position of the head B ′ to the other end of the groove is narrower than the diameter of the head B ′. As shown in FIG. 15, the wall thickness of the groove of the groove is temporarily thicker from the receiving position of the head B ′ toward the other end side of the groove. This fastening device has a hole P-2 'formed in the end surface of the other plate member P-2 to be jointed, and at the above-mentioned hole P-2' from one surface of the plate member P-2. A bearing hole P-2 ″ is bored so as to be orthogonal and continuous, and the bearing hole P-2 ″ is accommodated from the end surface on the side where the operation recess 201 is not provided, and the plate material P-2 is inside. Buried in. Therefore, as shown in FIG. 13, the head B'of the bolt B inserted through the hole P-2 'has a groove-shaped opening in the receiving hole 202 of the fastening device Y. As shown in FIG. 14 with the head B ′ of the bolt B thus received, the operation recess 201 facing outward from the opening of the bearing hole P-2 ″ of the plate P-2. Insert the tip of a screwdriver, etc. into the bearing hole P-2 ″ so that the head portion B ′ of the bolt B moves relatively toward the narrow groove side of the groove-shaped opening. By rotating the tightening locking tool in the bearing hole P-2 ″, the head portion B ′ of the bolt B is moved into the tightening locking tool Y by the groove wall which is temporarily thick. As a result, the plate material P-1 on which the bolt B is fixed is directed to the plate material P-2 side. It is drawn Te can, both plate P-1, P-2 can be joint.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional fastening device X, the receiving hole 101 for receiving the large-diameter head portion S ′ of the screw S screwed into the end portion of the one plate member P-1 to be jointed, and the receiving hole 101 Since the operation holes 102 that are in communication with each other and that accommodate the adjacent fasteners 103 are opened in the same direction, as shown in FIG. 9, the receiving holes 101 of the fasteners X are tightened. The plate material P-1 is placed on the surface of the plate material P-2 so that the ends thereof are in contact with each other so that the screw S can be inserted more. For this reason, the operation hole 102 adjacent to the receiving hole 101 is arranged with the end edge of the plate material P-1 close to it, and the end portion of the tightening tool 103 facing outward from the operation hole 102. The work of inserting a screwdriver or the like into the screw and rotating the fastener 103 is difficult to perform because the plate surface of the plate material P-1 is an obstacle. Further, it is necessary to consider the wall thickness of the plate P-1 so that the operation hole 102 of the fastener 103 is not covered by the thickness of the plate P-1 when the plate P-2 is placed. As a result, the range of plate materials that can be used with the conventional tightening lock X is limited, and the versatility is low. Further, when using a cabinet that is assembled by being jointed, the operation hole 102 is exposed on the inner surface of the cabinet which is relatively visible, which makes it difficult to simplify the appearance of the cabinet.

On the other hand, as shown in FIGS. 13 and 14, the conventional fastening device Y has a hole P-2 ′ formed in the end surface of the other joined plate P-2. At the same time, a bearing hole P-2 ″ is formed so as to be orthogonal to and continuous with the hole P-2 ′ from one surface of the plate material P −2, and the operation recess 201 is formed in the bearing hole P-2 ″. Since it is housed from the end surface on the side not provided with and is embedded in the plate material P-2, the bolt B is projected from the side surface of the plate material P-1 with respect to the plate material P-1 into which the bolt B is screwed. With the head portion B'of the bolt B being received in the hole P-2 ', the plate member P-2 can be assembled by contacting the end faces having the hole P-2'. The drawn-in bolt B communicates with the receiving hole P-2 'of the bolt B, and the plate member P is orthogonal to the receiving hole P-2'. -2 can be carried out by inserting a driver into the operation recess 201 facing outward from the bearing hole P-2 "opened from the side surface of -2 and rotating the tightening locking tool Y. When rotating and tightening, assemble the cabinet so that the wall surface of the plate material P-1 to be assembled does not get in the way and the bearing hole P-2 "is located on the outer surface of the cabinet that is difficult to see when using the cabinet. Can be attached. However, in order to make this fastening device Y function, a receiving hole P-2 'for the bolt B is formed from the end surface of the plate P-2, and the hole P-2' and the plate P-2 are formed. It was necessary to form bearing holes P-2 ″ so as to be orthogonal to each other and communicate with each other within the wall thickness, and it took time and effort to attach to the plate material P-2. If a force directed to the inside or outside of the cabinet is applied to the plate material P-2 in order to reduce the thickness of the plate material P-2 between the plate material P-2 "and the P-2", this thin portion Was easily damaged.

In view of the above, according to the present invention, it is possible to easily embed each plate material constituting a cabinet or the like on the side surface on the joint side, and at the time of embedding, there is no need to make a thin portion in the plate material, and a bolt or a screw that can be received. It is an object of the present invention to provide a tightening / locking tool that can easily perform a joint work of each plate member by pulling in from the cabinet outer surface side.

[0008]

[Means for Solving the Problems]

 In this invention, in order to achieve the above-mentioned object, a tightening locking tool used for a joint between plate materials constituting a cabinet or the like, and a tightening tool such as a screw S having a large diameter head S ′ is tightened. A buried case (10) having a receiving hole (11) to be received from the head S'side of the tool and opened from one surface and an operating hole (12) from a surface opposite to the opening surface of the receiving hole (11), The operation hole 12 and the receiving hole 11 are in communication with each other, and the shaft rod 20 ′ of the fastener 20 is rotatably accommodated in the operation hole 12 so that the shaft rod of the fastener 20 can be connected. 20 ′ faces at least the opening side of the operation hole 12 of the embedded case 10 and is inclined in the circumferential direction of the shaft rod 20 ′ and toward the opening side of the operation hole 12. A protrusion 23 having an abutment surface 23a is provided The engaging member 20 is engaged with the head S'of the diameter of the tightening tool, the engaging surface 23a of the protrusion 23 being received in the receiving hole 11 by the rotation of the shaft 20 '. Then, the tightened tool is housed in the operation hole 12 so as to be temporarily retracted toward the operation hole 12 opening side of the embedded case 10.

[0009]

[Action]

 In this invention, a tightening locking tool used for a joint between plate materials constituting a cabinet or the like is provided with a tightening tool such as a screw S having a head S ′ having a large diameter on the head S ′ side of the tightening tool. A buried case (10) having a receiving hole (11) to be received more from one surface and an operating hole (12) from the surface opposite to the opening surface of the receiving hole (11), the operating hole (12) and the receiving hole (11). And the shaft rod 20 'of the fastener 20 is rotatably accommodated in the operation hole 12, and the shaft rod 20' of the fastener 20 has at least the embedded portion. A projecting portion 23 facing the opening side of the operation hole 12 of the case 10 and extending along the circumferential direction of the shaft rod 20 ′ and having an abutment surface 23 a inclined toward the opening side of the operation hole 12 is provided. It is provided and the fastener 2 The abutment surface 23a of the protrusion 23 is engaged with the expanded head S'of the tightening tool received in the receiving hole 11 by rotating the shaft rod 20 ', and the tightening tool Since the structure is such that the embedded case 10 is temporarily retracted toward the opening side of the operation hole 11 and is housed in the operation hole 11, the tightening tool received in the receiving hole 11 is the same as the tightening tool. By rotating the tightening tool 20 of the tightening locking tool, the plate material P-1 having the head S ′ projected and screwed in is embedded in the tightening locking tool. Both plate members P-1 and P-2 can be jointed by pulling to the existing plate member P-2. Further, since the operation hole 12 for rotating the tightening tool is opened from the surface opposite to the opening surface of the receiving hole 11 provided in the buried case 10, the receiving side of the tightened tool, that is, From the surface of the plate material P-2 in which the tightening locking tool is embedded, on the side opposite to the side in contact with the plate material P-1 into which the tightening target is screwed, etc., the operation hole 12 in the tightening locking tool. The tightening tool 20 can be rotationally operated via the.

[0010]

【Example】

 Hereinafter, a typical embodiment of the fastening device according to the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 is an exploded perspective view of a tightening and locking device according to an embodiment, FIGS. 2, 4 and 6 are side sectional views showing the same use state, and FIGS. 3, 5 and 7 are the tightening members. FIG. 8 is a plan view showing parts of the stopper, and FIG. 8 is a perspective view showing a usage state of the tightening locking tool.

The tightening locking tool according to this embodiment includes an embedded case 10 and a tightening tool 20 housed in the embedded case 10.

The embedded case 10 is composed of a case body 10a having a substantially columnar outer shape, and a substantially disc-shaped lid 10b mounted and assembled on one end surface of the case body 10a. The case main body 10a is provided with a receiving hole extending substantially parallel to the axial center line of the case main body 10a from one end surface (surface opposite to the end surface on which the lid 10a is assembled) toward the other end surface. 11 is transparently provided. When the case body 10a is viewed from one end face, the receiving hole 11 has a size that can be accommodated within a semicircle that is divided into two by a line segment passing through the midpoint of a circle formed by the end face. A hole having a diameter is opened from the end face. From the end surface portion of the case body 10a where the receiving hole 11 is not provided, from one end surface of the case body 10a to the other end surface thereof, substantially parallel to the axis center line of the case body 10a, The operation hole 12 is transparently provided. The operation hole 12 has a small-diameter bearing hole portion 12a extending from a surface opposite to the end surface on which the lid 10a is assembled to a position approximately one third of the height of the case body 10a. A mounting hole 12b having a diameter larger than that of the bearing hole 12a is formed deeper than the end of the bearing hole 12a, and a hole extending from the end of the mounting hole 12b to the end face on the side where the lid 10a is assembled. Is a turning hole portion 12c having a larger diameter. Therefore, due to the difference in hole diameter between the holes, a step surface 12b 'is formed between the bearing hole 12a wall and the mounting hole 12b hole wall in the operation hole 12, and the mounting hole 12b' described above. Stepped surfaces 12c 'are formed between the hole wall of the hole 12b and the hole wall of the rotating hole 12c. The receiving hole 11 and the operating hole 12 are communicated with each other by notching the hole wall of the rotating hole portion 12c of the operating hole 12 on the receiving hole 11 side toward the receiving hole 11. Further, from the step surface 12b ′ formed between the hole wall of the bearing hole portion 12a and the hole wall of the mounting hole portion 12b on the side where the receiving hole 11 and the operation hole 12 are provided in series, A braking protrusion 12b ″ having an end face that is the same as the face 12c ′ face is projected. The end face of the case body 10a on the side where the lid 10a is assembled and the face opposite to the end face. An assembling hole 13 is formed substantially at a target position across the opening of the receiving hole 11. Further, an outer peripheral surface of the case body 10a is oriented in the circumferential direction of the case body 10a. A retaining rib 14 having an outwardly-opening inclined surface facing the end surface side opposite to the end surface side where the assembling hole 13 is bored is appropriately provided.

The lid body 10b is assembled on the end surface of the case body 10a on the side where the assembly hole 13 is formed, and communicates with the operation hole 12 and the rotation of the operation hole 12 at the time of assembly. A bearing hole 15 having a diameter smaller than that of the moving hole portion 12c is provided so as to extend from one surface toward the other surface. Further, a recess 16 having the same diameter as the receiving hole 11 of the case body 10a and communicating with the receiving hole 11 at the time of assembling is formed from the surface on the side in contact with the body case 12. From the surface of the lid body 10b that is in contact with the end surface of the case body 10a, an assembling rod 16 that fits into the assembling hole 13 of the case body 10a is provided in a protruding manner. Further, on the outer peripheral surface of the lid body 10b, the surface facing the circumferential direction of the lid body 10b and the surface on the side where the assembly rod 16 projects from the surface on the side where the assembly rod 16 does not project. A retaining rib 14 having an outwardly facing inclined surface is provided as appropriate.

The tightening tool 20 has an enlarged diameter portion 22 formed at approximately the middle of an axial rod 20 ′ having an operation concave portion 21 into which one end of a jig such as a screwdriver can be inserted, and the enlarged diameter portion. Starting from the edge on the side opposite to the operation recessed portion 21 side of 22 and extending toward the circumferential direction of the enlarged diameter portion 22 for a while, it extends over approximately three quarters of the entire circumference of the enlarged diameter portion 22 while temporarily becoming thicker. The protrusion 23 is formed by extending on the surface of the enlarged diameter portion 22. The projection 23 is provided on the operation recess 21 side in a direction orthogonal to the tangent line of the enlarged diameter portion 22 on the side where the operation recess 21 is provided, and in a direction in which the thickness of the projection is temporarily thick. It has an abutment surface 23a that gradually protrudes toward it. Also, of the step surface between the surface of the enlarged diameter portion 22 and the surface of the shaft rod 20 ′, from the step surface facing the end side of the shaft rod 20 ′ on the side where the operation recess 22 is not provided. Is provided with a protrusion 24 having a side edge on the same surface as the peripheral surface, following the peripheral surface on which the protrusion 23 of the expanded diameter portion 22 does not extend toward the end portion side. .

The tightening tool 20 has both ends of the shaft rod 20 ′ axially supported by the bearing hole portion 12 a of the case body 10 a of the buried case 10 and the bearing hole 15 of the lid portion 10 b, and the operation recess portion. The end portion on the side where 21 is provided is housed in the operation hole 12 in the embedded case 10 in a state where the end portion of the lid portion 10b is projected outward from the bearing hole 15 of the lid portion 10b. That is, the protrusion 23 protruding from the peripheral surface of the expanded diameter portion 22 of the fastener 20 is housed in the rotation hole portion 12c in the operation hole 12 of the embedded case 10, and The protrusion 24 protruding from the stepped surface between the surface of the enlarged diameter portion 22 of the fastener 20 and the surface of the shaft rod 20 'is housed in the mounting hole portion 12b. The protrusion width of the protrusion 23 of the fastener 20 from the enlarged diameter portion 22 is determined by the operation hole 12 when the fastener 20 is housed in the embedded case 10 as described above. The projection 23 is dimensioned to project into the receiving hole 11 communicating with the hole 12.

In the tightening locking tool having the above-mentioned structure, the lid portion 10b side is embedded in the embedding hole H formed from one surface of the plate material P-2 to be jointed from one surface of the plate material P-2. It is used by being housed in the buried hole H so as to be in contact with the bottom surface of the hole H. The shaft of the fastener 20 that communicates with the embedded hole H from the surface of the plate P-2 opposite to the embedded surface of the embedded hole H and projects outward from the bearing hole 15 of the lid portion 10b. A hole H'for accommodating the end portion of the rod 20 'is appropriately formed.

Next, the operation of the tightening lock according to this embodiment will be described with reference to FIGS. 2 to 7. Note that FIGS. 2, 4, and 6 show the tightening locking tool cut at a position corresponding to the position shown by the arrow in FIGS. 3, 5, and 7. First, as shown in FIGS. 2 and 3, the surface on the side where the projection 23 of the expanded diameter portion 22 of the fastener 20 is not extended is located on the communication side of the receiving hole 11 and the operation hole 12. By arranging the fastener 20 in the operation hole 12 so as to be in contact with each other, the head S ′ of the screw S protruding from the end face of the plate P-1 to be joined is received. Put it in the insertion hole 11. The protrusion 24 provided on the fastener 20 is provided at a position corresponding to the peripheral surface of the enlarged diameter portion 22 on which the protrusion 23 is not extended, while the protrusion 24 of the operation hole 12 is provided. Since the braking ridge 12b ″ is provided at a position where the operation hole 12 and the receiving hole 11 communicate with each other from the step surface 12b ′, the position where the protrusion 24 abuts on the braking ridge 12B ″. By rotating the tightening tool 20 up to this state, the protrusion 23 is not projected toward the inside of the receiving hole 11, that is, the head S ″ of the screw S is accommodated in the receiving hole 11. Then, as shown in Fig. 4 and Fig. 5, the head S'of the screw S is housed in the receiving hole 11, and the head S'and the screw S are screwed together. On the step surface formed between the main body of S Insert the driver through the hole H'provided in the plate P-2 so that the protrusion 23 of 20 abuts on the engaging surface 23a on the side of the thin end of the protrusion 23 so that the tip of the driver is Inserted in the operation recess 21 provided on the end surface of the shaft 20 'of the fastener 20, and rotating the fastener 20 in the clockwise direction in Fig. 4. The fastener 20 is provided as described above. The protruding portion 23 is temporarily thickened in the circumferential direction of the axial rod 20 ', and the radial contact surface 23a of the protruding portion 23 is located on the operating recess 21 side of the axial rod 20', that is, the plate member P. -2 is inclined for a while toward the surface on the opening side of the hole H ', so that by continuing the rotation, the screw S with which the stepped surface formed by the head S'is abutted on the abutting surface 23a. Is temporarily drawn into the receiving hole 11 toward the hole H ′ side surface. Along with this, the end surface of the plate material P-1 into which the screw S is screwed in is also pulled toward the surface of the plate material P-2 for a time. Then, as shown in FIGS. When the end surface of the plate material P-1 to which the screw S is screwed and which is to be joined completely contacts the surface of the plate material P-2 on the side where the embedded hole H is opened, the tightening tool 20 is further rotated. Even if it is attempted to do so, the screw S screwed into the plate material P-1 can no longer be drawn into the receiving hole 11, so the operation for joining the plate materials P-1 and P-2 at this point is When the plate member P-1 is joined to the plate member P-2 by using the tightening / locking tool according to this embodiment, the embedding provided on the plate member P-2 as shown in FIG. The opening of the hole H depends on the end surface of the plate P-1. Since it is hidden by the end face of the plate P-1, the surface of the fastener 20 housed in the buried hole H on the opening side of the receiving hole 11 can also be covered by the end face of the plate P-1. The appearance of the cabinet composed of P-1 and P-2 can be simplified.

[0018]

[Effect of device]

 According to the tightening locking tool used for the joint between the plate materials constituting the cabinet or the like according to the present invention, the tightened locking tool such as the screw received in the receiving hole of the tightening locking tool projects its head. By rotating the tightening tool housed in the operation hole communicating with the receiving hole of the tightening locking tool, the plate material screwed in is embedded in the tightening locking tool. Since both plates can be joined by being drawn to the plate, it is possible to easily assemble a so-called knockdown type assembly cabinet or the like. The operation hole for rotating the fastener is opened from the surface opposite to the opening surface of the receiving hole provided in the buried case. Therefore, from the surface of the plate material in which the fastening locking tool is embedded, on the receiving side of the fastening tool, that is, on the side opposite to the side in contact with the plate material on which the fastening tool is screwed, etc. The tightening tool can be easily rotated through the operation hole in the inside. In order to embed the tightening locking tool in the plate member, a buried hole is formed in one surface of the plate member, and the tightening locking tool is inserted in the embedding hole from the other surface of the plate member. It is sufficient to make a hole that communicates with the operation hole of the tightening lock when it is stored so that it is easy to process the plate material when installing the tightening lock. In addition, it has a feature that such a hole is not used to make a thin portion in the plate material unnecessarily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a tightening lock according to an embodiment.

FIG. 2 is a side cross-sectional view showing a usage state of the tightening locking tool according to the embodiment.

FIG. 3 is a plan view of a case main body 10a that constitutes the tightening locking tool according to the embodiment.

FIG. 4 is a side cross-sectional view showing a usage state of the tightening locking tool according to the embodiment.

FIG. 5 is a plan view of a case main body 10a that constitutes the tightening locking tool according to the embodiment.

FIG. 6 is a side cross-sectional view showing a usage state of the tightening locking tool according to the embodiment.

FIG. 7 is a plan view of a case main body 10a that constitutes the tightening locking tool according to the embodiment.

FIG. 8 is a perspective view showing a usage state of the tightening locking tool according to the embodiment.

FIG. 9 is a perspective view showing a usage state of a conventional tightening lock tool X.

FIG. 10 is a side cross-sectional view showing a usage state of a conventional tightening locking tool X.

FIG. 11 is a side cross-sectional view showing a usage state of a conventional tightening lock tool X.

FIG. 12 is a perspective view showing a usage state of a conventional tightening locking tool Y.

FIG. 13 is a side cross-sectional view showing a usage state of a conventional tightening locking tool Y.

FIG. 14 is a side sectional view showing a usage state of a conventional tightening and locking tool Y.

FIG. 15 is a plan cross-sectional view showing components of a conventional tightening locking tool Y.

[Explanation of symbols]

 P-1 plate material P-2 plate material S screw S'head H embedding hole H'hole 10 embedding case 10a case body 10b lid body 11 receiving hole 12 operation hole 12a bearing hole portion 12b mounting hole portion 12b 'step surface 12b " Braking convex strip 12c Rotating hole 12c 'Step surface 13 Assembly hole 14 Detachment rib 15 Bearing hole 16 Assembly rod 20 Fastening tool 20' Axle rod 21 Operation recess 22 Expanded part 23 Projection 23a Abutment surface 24 Projection

Claims (1)

[Scope of utility model registration request] 1. A receiving hole for receiving a tightening tool such as a screw having a large diameter head from the head side of the tightening tool is formed from one surface, and a receiving hole on the opposite side of the receiving surface is formed. A buried case in which an operation hole is opened from a surface, the operation hole and the receiving hole communicate with each other, and the shaft rod of the fastener is rotatably accommodated in the operation hole. The shaft rod of the fastener has at least an abutment surface facing the opening side of the operation hole of the embedded case and extending in the circumferential direction of the shaft rod and inclined toward the opening side of the operation hole. The fastener has a protrusion, and the fastener has an engaging surface of the protrusion that engages with a head portion of the diameter of the tightened tool that is received in the receiving hole when the shaft rod is rotated. , Temporarily aiming the tightened tool toward the operation hole opening side of the buried case Tightening fasteners, characterized in that which is on the can inclusive capable the operation hole.