JP2007147061A - Fastening device and its seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening device with a looseness preventing mechanism having a bent washer, for hardly causing the deformation of a fastened member even when the fastened member is formed of a thin plate or a soft material. <P>SOLUTION: The fastening device T with the looseness preventing mechanism comprises a rotary fastener 11, the bent washer 12 for preventing the rotation of the rotary fastener 11, and a seat 13 having greater rigidity than the bent washer 12. The seat 13 is arranged on the reverse side of the bent washer 12 so that an abutting face 13b on the reverse side of the seat 13 abuts on the surface of the fastened member 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tightening device provided with a loosening prevention mechanism, and further relates to a base for a tightening device suitably used for the tightening device.

  As a tightening device provided with a loosening prevention mechanism, for example, a device disclosed in Patent Document 1 is known. As shown in FIG. 9, the fastening device includes a bolt (rotary fastening tool) 101 and a folding washer 102 that prevents the bolt 101 from rotating. The corners of the bolt 101 are bent and brought into contact with the head of the bolt 101 to prevent the bolt 101 from loosening.

Japanese Patent Laying-Open No. 2005-0776645 (FIGS. 7 and 8)

  Since the bending washer 102 of the tightening device shown in FIG. 9 is formed of a thin plate so that it can be easily bent, there is a risk of deformation due to the tightening force of the bolt 101. When the bending washer 102 is deformed by the tightening force of the bolt 101, a large supporting stress acts on the periphery of the bolt 101. Therefore, when the member Q to be tightened is formed of a thin plate or a soft material, When a long hole or a loose hole is formed in the member to be tightened Q, the member to be tightened Q may be deformed.

  Note that the above-mentioned problem is similarly applied to the case where a loose washer such as a nut is used to prevent loosening of a rotary fastener other than a bolt.

  From this point of view, the present invention provides a tightening device with a loosening prevention mechanism provided with a bending washer, and even if the member to be tightened is formed of a thin plate or a soft material. It is an object of the present invention to provide a fastening device that hardly causes deformation of the attaching member, and to provide a base for a fastening device that is preferably used for the fastening device.

  In addition, when the surface of the member to be tightened is not flat, if a conventional washer is interposed between the member to be tightened and the rotary fastener, the member to be tightened is subject to thermal expansion and contraction. When the fastening member moves relative to the rotary fastener, wear occurs between the member to be fastened and the washer, and the fastening axial force decreases. As a result, the rotary fastener is caused by vibration or the like. May loosen. From such a point of view, another object of the present invention is a fastening device that includes a conventional washer and a rotary fastener, and is capable of preventing loosening of the rotary fastener. It is an object to provide an apparatus.

  The fastening device according to the present invention, which has been devised to solve such a problem, includes a rotary fastener, a folding washer that prevents the rotary fastener from rotating, and a folding washer. A tightening device with a loosening prevention mechanism provided with a rigid base, wherein the base is disposed on the back side of the bent washer, and the contact surface on the back side of the base is the cover. It abuts on the tightening surface of the tightening member.

  In short, the present invention is characterized in that a pedestal that is more difficult to deform than the folded washer is interposed between the folded washer and the tightened member. That is, in the present invention, the tightening force of the rotary fastener acts on the member to be tightened via the pedestal having higher rigidity than the bending washer. In this case, since the supporting stress acting on the member to be tightened is smaller than that of a conventional tightening device that does not have a pedestal, the member to be tightened may be formed of a thin plate or a soft material. Even if a long hole or a loose hole is formed in the member to be tightened, it is difficult to cause deformation in the member to be tightened.

  The rotary fastener is a general term for fasteners formed with male screws and female screws such as bolts and nuts.

  In the present invention, the above-described fastening device may be provided with a retractable member that is compressed in the fastening direction by the fastening force of the rotary fastener. If it does in this way, since a contractible member will be compressed when a rotary type fastener is clamped, it will become possible to confirm the clamping situation of a rotary type fastener visually.

  The retractable member is preferably disposed between the bent washer and the pedestal. If it does in this way, since a clearance gap will be formed between a bending washer and a base, it will become easy to utilize a tool etc. when bending a bending washer.

  The retractable member may be provided at a site where the tightening force of the rotary fastener acts, but when the rotary fastener is a bolt, it may be attached to the shaft portion of the bolt. If it does in this way, when a clamping device is conveyed and used, it will become difficult to drop a contractible member. In addition, as a retractable member which can be attached to the axial part of a volt | bolt, a disc spring, a spring washer, etc. correspond, for example. In particular, if a spring washer that can be easily procured is made of a retractable member, an inexpensive fastening device can be realized.

  When the rotary fastener is a bolt, a through hole may be provided in the bent washer and the pedestal, and a shaft portion of the bolt may be inserted into the through hole. If it does in this way, it will become possible to carry in the state which mounted | worn the bending washer, the base, and the retractable member to the axial part of the volt | bolt.

  When a through hole is formed in the bending washer and the pedestal, and the shaft portion of the bolt is inserted into the through hole, a retaining member for preventing the bolt from coming out from the through hole of the pedestal may be provided. . This makes it easier to handle the folded washer or pedestal when the folded washer or pedestal is mounted on the bolt shaft, making it easier to handle and thus tightening work easier. This can be done quickly.

  Note that the retaining member is more preferably fitted to the shaft portion of the bolt. If it does in this way, since it will become difficult for the drop-off prevention member itself to fall off from the axial part of a bolt, it will become possible to prevent fall-off of a base etc. certainly.

  The outer diameter of the retaining member is preferably larger than the diameter of the through hole formed in the pedestal. In this way, it is possible to prevent the pedestal from falling off more reliably.

  Further, if the outer diameter of the retaining member is made smaller than the diameter of the insertion hole formed in the tightening member, the retaining member is tightened when the bolt is tightened to the tightening member. Since it enters the insertion hole formed in the attaching member, the contact surface of the pedestal and the to-be-tightened surface of the to-be-tightened member are surely brought into surface contact.

  Further, the base for the fastening device capable of preventing the loosening of the rotary fastening tool is a base for the fastening device interposed between the washer and the fastening member, and the fastening member The contact surface formed of the same kind of metal or synthetic resin and shaped so as to follow the shape of the tightened surface of the tightened member, and the surface opposite to the contact surface is a flat surface It is characterized by being. According to such a pedestal, since the tightening force acts uniformly on the tightened member, even if the tightened member moves relative to the pedestal due to thermal expansion or contraction, the tightened member As a result, the rotary fastener is less likely to be loosened. Further, according to the fastening device using this pedestal, it is possible to prevent loosening of the rotary fastener even when the member to be fastened is moved due to thermal expansion and contraction. In the case where the fastening member is a transverse beam constituting a vehicle protective fence, it is possible to maintain the fastening force of the rotary fastener over a long period of time even if the number of maintenance is reduced. . In addition, maintenance of the vehicle protection fence itself can be reduced by making the cross beams and joint members constituting the vehicle protection fence made of aluminum alloy.

  According to the tightening device of the present invention, even if the member to be tightened is formed of a thin plate or a soft material, or a long hole or a loose hole is formed in the member to be tightened, It becomes difficult to cause deformation in the tightening member.

  Further, if the pedestal for the fastening device according to the present invention is interposed between the bending washer and the fastening member, the fastening member may be formed of a thin plate or a soft material, Even if a long hole or a loose hole is formed in the attaching member, it is difficult to cause deformation in the member to be tightened. Further, according to the pedestal for a tightening device according to the present invention, the tightening force acts uniformly on the tightened member, so that the tightened member moves relative to the base due to thermal expansion and contraction. Even if it exists, it will become difficult to wear to a to-be-clamped member, and as a result, it will become difficult to produce looseness in a rotary type fastener.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  In addition, in the following description, although the case where the fastening apparatus which concerns on this invention is applied to the guard fence for vehicles is illustrated, it is not the meaning which limits the use of the fastening apparatus which concerns on this invention.

(Vehicle guard fence)
First, the configuration of the vehicular protective fence G according to the present embodiment will be described.

  As shown in FIG. 1, the vehicle guard fence G includes a plurality of support columns 1 (only one is shown in FIG. 1) installed on the foundation concrete C constructed along the roadway R, and the roadway R side of the support column 1. And the joint members 3 disposed across the ends of the lateral beams 2 and 2 adjacent to each other in the longitudinal direction.

  As shown in FIG. 1A, the support column 1 includes a base portion 1a installed in a recess C1 formed on the upper surface of the foundation concrete C, a main body portion 1b standing up from the base portion 1a, and the main body portion 1b. And a holding portion 1c formed on the uppermost roadway R side. The anchor bolt C2 embedded in the foundation concrete C is fixed to the base portion 1a. The concave portion C1 is filled with mortar C3.

  The cross beam 2 is made of an extruded shape made of an aluminum alloy (A6061S-T6) having a circular tube shape. As shown in FIG. 2, a plurality of (two in this embodiment) insertion holes 2 a and 2 a are formed in the tightened surface 2 b provided on the outer surface of the end portion of the cross beam 2.

  The joint member 3 connects the adjacent horizontal beams 2 and 2 and is disposed inside the horizontal beam 2 in the present embodiment. In the joint member 3, female screw holes 3a and 3a corresponding to the insertion holes 2a and 2a of the cross beam 2 are formed. The joint member 3 is made of an extruded shape member made of an aluminum alloy (A6061S-T6) having a tubular shape.

  In the following description, the cross beam 2 is referred to as a “fastened member 2”, and the joint member 3 is referred to as a “screwed member 3”.

(Tightening device)
Next, the configuration of the tightening device T according to the present embodiment will be described with reference to FIG.

  The fastening device T is for fastening the fastened member 2 to the screwed member 3, and prevents a plurality of (two in this embodiment) bolts 11, 11 and rotation of each bolt 11. And a pedestal 13 having a rigidity higher than that of the bending washer 12. The tightening device T according to the present embodiment further includes the number of retractable members 14 and 14 and the retaining members 15 and 15 corresponding to the number of bolts 11.

  The bolt 11 is a type of rotary fastener, and a shaft portion 11a (hereinafter referred to as “bolt shaft portion 11a”) on which a male screw that is screwed into the female screw hole 3a of the member to be screwed 3 is formed. And a regular polygonal head portion 11b (hereinafter referred to as “bolt head portion 11b”) to which a tightening tool such as a ratchet wrench or a spanner is engaged.

  Note that the form of the bolt shaft portion 11a and the form of the bolt head portion 11b are not limited to those shown in the drawings, and may be appropriately changed. The material of the bolt 11 is not particularly limited, but in the present embodiment in which the member 2 to be tightened is made of an aluminum alloy, it is desirable that the material is made of stainless steel (for example, SUS304).

  The bending washer 12 is made of a plate-like member having a rectangular (rectangular) shape in plan view, and the rotation of the bolt 11 is prevented by bending the corner of the bending washer 12 and contacting the side surface of the bolt head 11b. Further, the bending washer 12 has through holes 12 a and 12 a at positions corresponding to the insertion holes 2 a and 2 a of the member 2 to be tightened. The bolt shaft portion 11a is inserted through the through hole 12a. In addition, although the bending washer 12 needs to be relatively unrotatable with respect to the bolts 11 and 11, in the present embodiment, a plurality (two in the present embodiment) of the through holes 12 a and 12 a are provided. This is realized by inserting the bolt shaft portions 11a and 11a, respectively.

  The form of the bending washer 12 may be appropriately changed according to the purpose of use of the fastening device T. For example, although not shown, the bent washer 12 may be a circular shape, an elliptical shape, a polygonal shape, or the like in plan view. The material of the bent washer 12 is not particularly limited, but in the present embodiment in which the bolt 11 is made of stainless steel, it is preferable that the material is made of stainless steel (for example, SUS304) or aluminum alloy.

  The pedestal 13 is disposed on the back surface side (the tightened member 2 side) of the bent washer 12. That is, the pedestal 13 is interposed between the bent washer 12 and the tightened member 2, and when the bolt 11 is tightened, the contact surface 13 b on the back side of the pedestal 13 is the surface of the tightened member 2. (In more detail, it abuts on the tightening surface 2b).

  The pedestal 13 is made of a plate-like member having a rectangular (rectangular) shape in plan view, and the through holes 13a and 13a through which the bolt shaft portions 11a are inserted at positions corresponding to the insertion holes 2a and 2a of the member 2 to be tightened. Is formed. The pedestal 13 is larger in bending rigidity than the folded washer 12 and is not easily deformed.

  The contact surface 13b of the pedestal 13 is formed into an arc surface so as to follow the tightened surface 2b of the tightened member 2, and is in close contact with the tightened surface 2b without a gap. In the present embodiment, the entire back surface of the pedestal 13 is the contact surface 13b.

  The form of the pedestal 13 may be appropriately changed according to the purpose of use of the fastening device T. For example, although not shown, the pedestal 13 that exhibits a circular shape, an oval shape, a polygonal shape, or the like in plan view may be used. The material of the pedestal 13 is not particularly limited, but in the present embodiment in which the member 2 to be tightened is made of an aluminum alloy, it is desirable that the material is made of an aluminum alloy (for example, A6063S-T5). When the pedestal 13 is made of an aluminum alloy, an anodized film may be formed on the surface. In addition, the pedestal 13 may be made of a nylon synthetic resin.

  The retractable member 14 is compressed in the tightening direction by the tightening force of the bolt 11, and in the present embodiment, is composed of a spring washer that is wrapped around the bolt shaft portion 11a. Further, the retractable member 14 according to the present embodiment is disposed between the bending washer 12 and the pedestal 13 and is sandwiched between the bending washer 12 and the pedestal 13 when the bolt 11 is tightened.

  In the present embodiment, the case where a spring washer is used as the retractable member 14 because it is easy to procure materials and can securely transmit the tightening force to the pedestal 13 is illustrated, but the present invention is not limited thereto. In other words, a coil spring or a disc spring may be used as the retractable member 14. The material of the retractable member 14 is not particularly limited, but in the present embodiment in which the bolt 11 and the bending washer 12 are made of stainless steel and the pedestal 13 is made of an aluminum alloy, stainless steel (for example, SUS304 or the like) is used. ) Or aluminum alloy.

  Moreover, in this embodiment, although the retractable member 14 was arrange | positioned between the bending washer 12 and the base 13, it is not limited to this, Although illustration is abbreviate | omitted, You may arrange | position between the bending washers 12.

  Further, in the present embodiment, the retractable member 14 is mounted on the bolt shaft portion 11a. However, the retractable member 14 may not be mounted on the bolt shaft portion 11a. For example, a block-like member made of a material having a small elastic coefficient such as rubber, foamed polystyrene, or synthetic resin may be used as a retractable member, and this may be interposed between the bent washer 12 and the base 13.

  The retaining member 15 prevents the bolt 11 from coming out of the through hole 13a of the pedestal 13, and in this embodiment, a rubber or synthetic resin fitted to the bolt shaft portion 11a on the back side of the pedestal 13 is used. It consists of an annular member (O-ring) made of. The outer diameter of the retaining member 15 is larger than the diameter of the through hole 13a of the base 13 and smaller than the diameter of the insertion hole 2a of the member 2 to be tightened. The retaining member 15 may be disposed on the tip end side of the bolt shaft portion 11a, or after the bent washer 12, the pedestal 13 and the retractable member 14 are offset toward the bolt head 11b side, the pedestal 13 You may arrange | position so that it may contact | abut on the back surface of (refer Fig.3 (a)).

  A method of using the tightening device T configured as described above will be described with reference to FIGS. 3 and 4.

  First, as shown in FIG. 3A, the bolt shaft portion 11a is inserted into the through hole 12a (see FIG. 2) of the bent washer 12, the retractable member 14, and the through hole 13a of the base 13 (see FIG. 2). The fastening device T is formed by inserting the retaining member 15 into the bolt shaft portion 11a.

  Next, as shown in FIG. 3B, the bolt shaft portion 11a is inserted into the insertion hole 2a of the member 2 to be tightened, and the bolt head portion 11b is rotated to connect the bolt shaft portion 11a to the member to be screwed. 3, the contact surface 13 b of the base 13 is brought into contact with the tightening surface 2 b of the member 2 to be tightened.

  Subsequently, as shown in FIG. 3 (c), the bolt 11 is rotated using a tightening tool (not shown), and the bolt shaft portion 11a is screwed into the female screw hole 3a of the member 3 to be screwed. The bolt 11 is tightened until a predetermined tightening force is obtained. At this time, the retractable member 14 is compressed in the tightening direction (that is, the axial direction of the bolt shaft portion 11a) by the tightening force of the bolt 11, so that the tightening of the bolt 11 can be confirmed by visually confirming the compression state. It is possible to grasp the attached status. Note that the tightening force of the bolt 11 acts on the member 2 to be tightened via the base 13 having a rigidity higher than that of the bent washer 12.

  Thereafter, as shown in FIG. 4, when the corner 12b of the bending washer 12 that is mounted so as not to rotate is bent and brought into contact with the bolt head 11b, loosening (rotation) of the bolt 11 is prevented.

  As shown in FIG. 3C, when the corner of the bent washer 12 is bent, a tool or the like is provided in the gap t formed between the bent washer 12 and the base 13 by the retractable member 14. It is good to insert.

  Although there is no restriction | limiting in particular in the tool used when bend | folding the bending washer 12, What is necessary is just to bend using a screwdriver, a chisel, and a hammer.

  According to the tightening device T according to the present embodiment described above, it is possible to reduce the bearing stress acting on the tightened member 2 as compared with the conventional tightening device that does not include the pedestal 13. Therefore, even when the tightening member 2 is formed of a thin plate or a soft material, or when a long hole or a loose hole is formed in the tightening member 2, the tightening member 2 is deformed. It becomes difficult to generate.

  Since the bolt shaft portion 11a is inserted into the through hole 12a of the bent washer 12 and the through hole 13a of the pedestal 13, and the retractable member 14 is mounted on the bolt shaft portion 11a, the bent washer 12, the pedestal 13 and the The retractable member 14 can be carried in a state where it is mounted on the bolt shaft portion 11a. Moreover, in the present embodiment, since the retaining member 15 having an outer diameter larger than the hole diameter of the through hole 13a of the base 13 is fitted to the bolt shaft portion 11a, the bolt shaft portion 11a is directed downward. The bent washer 12 and the pedestal 13 are difficult to come off. In other words, according to the tightening device T according to the present embodiment, it is possible to operate in a state in which various parts constituting the tightening device T are assembled (that is, the state of FIG. 3A). Can be performed easily and quickly.

  In this embodiment, since the outer diameter of the retaining member 15 is smaller than the diameter of the insertion hole 2a of the member 2 to be tightened, when the bolt 11 is tightened to the member 2 to be tightened, The retaining member 15 enters the insertion hole 2a (see FIG. 3B), and the contact surface 13b of the base 13 and the tightened surface 2b of the tightened member 2 are surely brought into surface contact.

  In the present embodiment, the tightening device T including the two bolts 11 and 11 is illustrated. However, the tightening device T may include three or more bolts, or may include one bolt. There is no problem. If there is only one bolt, it is necessary to lock the bent washer to the member to be tightened and make it non-rotatable.

  Moreover, in this embodiment, although the case where the rotary fastener was the volt | bolt 11 was illustrated, it is not the meaning which limits the rotary fastener of the clamping device which concerns on this invention. For example, in the case where a male thread protrudes from the member to be screwed, a nut may be used instead of the bolt 11 although illustration is omitted.

  Note that the pedestal 13 may not be used in combination with the folded washer 12. That is, the pedestal 13 may be used in combination with the spring washer 16 and the flat washer 17 instead of the bent washer 12 as in the tightening device T ′ shown in FIG.

  The tightening device T ′ shown in FIG. 5 will be described in more detail. The fastening device T ′ is for fastening the fastened member 2 to the screwed member 3, and is arranged on a bolt (rotary fastening tool) 11 and the seat surface side of the bolt 11. A spring washer 16, a flat washer 17 disposed on the back side of the spring washer 16, and a base 13 disposed on the back side of the flat washer 17 are configured. The pedestal 13 is fixed to the tightened member 2 only by the tightening force of the bolt 11.

  The structure of the pedestal 13 is the same as that described above, but will be described in more detail with reference to FIG. The contact surface 13b of the pedestal 13 is formed so as to be along the tightened surface 2b of the tightened member 2, and is in surface contact with the tightened surface 2b. Moreover, the surface (surface opposite to the contact surface 13b) 13c of the pedestal 13 is formed flat (planar), and is in surface contact with the back surface of the flat washer 17 (surface on the tightening member 2 side). The area of the surface 13c of the pedestal 13 is larger than that of the flat washer 17, and the entire back surface of the flat washer 17 contacts the surface 13c of the pedestal 13. Further, the rigidity of the pedestal 13 is larger than the rigidity of the flat washer 17. In addition, it is desirable that the hole diameter of the through hole 13a of the base 13 is smaller than the hole diameter of the insertion hole 2a of the member 2 to be tightened. The material of the pedestal may be the same kind of metal when the member 2 to be tightened is a metal member such as an aluminum alloy, but a nylon-based synthetic resin that does not easily wear the member 2 to be tightened when slid. It may be a material.

  Even in such a tightening device T ′, it is possible to reduce the bearing stress acting on the tightened member 2 as compared with the case where the pedestal 13 is not interposed. Even when it is formed of a soft material or when the insertion hole 2b of the member 2 to be tightened is a long hole or a loose hole, it is difficult to cause deformation of the member 2 to be tightened. When the pedestal 13 is omitted, as shown in FIG. 7, when the flat washer 17 comes into contact with the tightening member 2, the tightening surface 2b of the tightening member 2 is a curved surface. Since the back surface of the flat washer 17 is a flat surface, the flat washer 17 makes point (line) contact with the tightened surface 2b. That is, when the pedestal 13 is omitted, the bearing stress acting on the member to be tightened 2 is increased, so that the member 2 is easily deformed.

  By the way, the horizontal beam 2 as the tightened member 2 expands and contracts with changes in the temperature. Therefore, when the pedestal 13 is omitted, the outer periphery of the horizontal beam 2 is caused by the flat washer 17 that is in point (line) contact with the horizontal beam 2. The surface is greatly shaved and worn, and in some cases, the tightening force of the bolt 11 may be reduced. In particular, when the member 2 to be tightened is made of an aluminum alloy and the plain washer 17 is made of steel (including stainless steel) harder than the aluminum alloy, the outer peripheral surface of the cross beam 2 is easily worn, and the bolt 11 is tightened. There is a possibility that the applied force is greatly reduced. On the other hand, if the pedestal 13 is interposed between the horizontal beam 2 and the flat washer 17, the bearing stress acting on the horizontal beam 2 is reduced, so that the outer peripheral surface of the horizontal beam 2 is not greatly shaved. The tightening force of the bolt 11 is not significantly reduced.

  In this embodiment, the contact surface 13b of the pedestal 13 is a cylindrical surface according to the shape of the tightening surface 2b. However, the present invention is not limited to this, and the tightening surface 2b is a flat surface. Alternatively, the contact surface 13b may be formed into a flat surface.

  As shown in FIG. 8, a test body in which the connection portion of the horizontal beams 2 and 2 was reproduced was created, and a test for confirming the effect of the pedestal 13 was performed. In the test, the horizontal beams 2 and 2 were repeatedly expanded and contracted in the axial direction in order to simulate the expansion and contraction of the horizontal beam 2 caused by the temperature change of the day and the temperature change of the year.

  The tightening device used in the test is a tightening device T1 (same as the tightening device T ′ shown in FIG. 6) having a base 13, a spring washer 16, and a plain washer 17, and a tightening device T2 (without the base 13). (See FIG. 7). The horizontal beam 2 and the pedestal 13 are made of an aluminum alloy, and the spring washer 16 and the flat washer 17 are made of stainless steel. The bolt 11 was made of stainless steel, and its tightening torque was 75 (N · m).

  Table 1 shows the measurement result of the retightening torque of the bolt 11 after the test (equivalent to 365 days) and the measurement result of the axial force of the bolt 11 when 190 days have elapsed. For each specimen, measurement was performed on the two bolts 11 that fastened the lateral beam 2 that was moved (slided) relative to the joint member 3 among the lateral beams 2 and 2. As shown in Table 1, the retightening torque of the bolt 11 of the tightening device T1 is larger than that of the bolt 11 of the tightening device T2, and the axial force of the bolt 11 of the tightening device T1 is the tightening device T2. It can be seen that it is larger than that of the bolt 11. That is, it can be seen that if the pedestal 13 is interposed between the cross beam 2 and the flat washer 17, loosening of the bolt 11 can be prevented.

(A) is a sectional side view for demonstrating the guard fence for vehicles in which the clamping device based on embodiment of this invention was used, Comprising: XX sectional drawing of (b), (b) is (a) FIG. It is a disassembled perspective view of the clamping device concerning an embodiment of the present invention. It is sectional drawing explaining the usage method of the clamping apparatus which concerns on embodiment of this invention, Comprising: (a) is a figure which shows the state before mounting | wearing with a clamping apparatus, (b) is a rotary type fastener in female The figure which shows the state screwed in the screw hole, (c) is a figure which shows the state which tightened the rotary type | mold fastener. It is a perspective view which shows the state which bent the bending washer of the clamping apparatus which concerns on embodiment of this invention. It is a perspective view which shows the clamping device which uses the base which concerns on this invention. It is sectional drawing which shows the clamping device which uses the base which concerns on this invention. It is sectional drawing which shows the clamping device used in the test implemented in order to confirm the effect of the base which concerns on this invention. It is a schematic diagram for demonstrating the content of the test implemented in order to confirm the effect of the base which concerns on this invention. It is a perspective view which shows the conventional clamping device.

Explanation of symbols

T Tightening device 11 Bolt (Rotary fastening tool)
12 Bending Washer 13 Base 14 Retractable Member 15 Retaining Member 2 Fastening Member 2a Insertion Hole 2b Fastening Surface

Claims (13)

A rotary fastener,
A folded washer for preventing rotation of the rotary fastener;
A tightening device with a loosening prevention mechanism comprising a pedestal having rigidity greater than that of the bending washer,
The pedestal is disposed on the back side of the folded washer,
The fastening device according to claim 1, wherein a contact surface on a back side of the pedestal contacts a tightened surface of the tightened member.   The fastening device according to claim 1, further comprising a retractable member that is compressed in a fastening direction by a fastening force of the rotary fastening tool.   The fastening device according to claim 2, wherein the retractable member is disposed between the bent washer and the pedestal. The rotary fastener is a bolt;
The tightening device according to claim 2 or 3, wherein the retractable member is mounted around a shaft portion of the bolt. The rotary fastener is a bolt;
The bent washer and the pedestal have a through hole,
The fastening device according to any one of claims 1 to 4, wherein a shaft portion of the bolt is inserted into the through hole.   The tightening device according to claim 5, further comprising a retaining member that prevents the bolt from slipping out of the through hole of the pedestal.   The fastening device according to claim 6, wherein the retaining member is fitted to a shaft portion of the bolt.   The tightening device according to claim 7, wherein an outer diameter of the retaining member is larger than a diameter of the through hole formed in the base.   The fastening device according to claim 7 or 8, wherein an outer diameter of the retaining member is smaller than a diameter of an insertion hole formed in the fastened member. A rotary fastener,
A washer,
A fastening device comprising a pedestal interposed between the washer and the fastening member,
The pedestal is made of the same kind of metal or synthetic resin as the member to be tightened, and has a contact surface formed so as to follow the shape of the surface to be tightened of the member to be tightened. A clamping device, wherein a surface opposite to the surface is a flat surface. The to-be-tightened member is a transverse beam constituting a vehicle protective fence;
The fastening device according to claim 10, wherein the rotary fastening tool is a bolt that fixes the joint member connecting the transverse beams and the transverse beam. The transverse beam and the joint member are an aluminum alloy,
The fastening device according to claim 11, wherein the base is an aluminum alloy or a synthetic resin. A base for a fastening device interposed between a washer and a member to be fastened,
Made of the same kind of metal or synthetic resin as the member to be tightened,
For a clamping device, comprising: a contact surface formed so as to conform to a shape of a tightened surface of the tightened member; and a surface opposite to the contact surface being a flat surface Pedestal.

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