JP2013253617A - Bolt and nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt and a nut with enhanced security.SOLUTION: In a head portion 1, torque receiving parts 2 receiving rotating torque from a dedicated tool and torque reception inhibition parts 3 each having a curved outer face and inhibiting the torque receiving parts 2 from receiving rotating torque from a tool other than the dedicated tool, are alternately disposed around an axial center of the head portion 1. One of both side faces of the torque receiving part 2 serves as a tightening torque receiving face 21 for receiving tightening torque from the dedicated tool, the other face serves as a loosening torque receiving face 22 for receiving loosening torque from the dedicated tool. An outer face other than the both side faces is a curved face. The loosening torque receiving faces 22 are disposed at an angle inhibiting reception of loosening torque from a holding tool even when the head portion 1 is held across the axial center by the holding tool.

Description

  The present invention relates to a bolt and a nut.

  Conventionally, a bolt and a nut capable of improving crime prevention are known (Patent Document 1). These bolts and nuts adopt a special head shape and are difficult to remove with a normal tool. Therefore, it is effective for prevention of mischief, crime prevention, confidential information protection (black box), and so on.

  The nut (or bolt) disclosed in Patent Document 1 is a nut that can be tightened and relaxed by a tightening tool that engages with the nut body, and a rotational torque is applied to the nut body on the side peripheral surface of the nut body. A transmission surface 110 for transmission and an inclined surface 120 that is formed so as to face the transmission surface 110 and transmits rotational torque to the nut body are provided, and tightening is provided between the transmission surface 110 and the inclined surface 120 that faces the transmission surface 110. A gap 130 for engaging with the tool is provided (see FIG. 7).

  By the way, Patent Document 2 discloses a plier capable of accurately pinching and loosening a screw head with respect to a bolt that has been rusted and deformed due to deterioration over time and can be removed.

  The pliers 200 disclosed in Patent Document 2 project from the opposite end portions of the jaw portions 230 of the pair of sandwiching arms 210 and 220 arranged in an X-shape so as to protrude from both side ends toward the opposite surfaces. A pair of front pinching teeth 250 and vertical pinching teeth 240 provided between the front pinching teeth 250 are provided (see FIG. 8).

JP-A-11-351228 JP 2005-279801 A

  Since the pliers 200 disclosed in Patent Document 2 are provided with front pinching teeth 250 protruding from both side ends of the jaw portion 230, the front pinching teeth are disposed in the gap 130 of the nut 100 disclosed in Patent Document 1. 250 can be invaded. Thereby, the nut 100 can be clamped from both sides by the clamping arms 210 and 220, and the nut 100 can be removed by applying a relaxing torque to the transmission surface 110 or the inclined surface 120.

  As described above, the nut may be removed for the purpose of mischief, or confidential information may be leaked by removing the nut.

  This invention is made | formed in view of this point, and it aims at providing the volt | bolt and nut which can improve crime prevention.

  In order to achieve the above object, the bolt and nut of the present invention are configured as follows.

  The bolts and nuts according to the present invention each have a head that prevents relaxation by a gripping tool and engages only with a dedicated tool, and can be tightened and relaxed only with the dedicated tool, The head includes a torque receiving portion that receives rotational torque from the dedicated tool, and a torque receiving blocking portion that has a curved outer surface and blocks the torque receiving portion from receiving rotational torque other than the dedicated tool. Alternatingly arranged around the axis of the head, the torque receiving portion has one of its both side surfaces as a tightening torque receiving surface for receiving the tightening torque from the dedicated tool, and the other surface being A relaxation torque receiving surface that receives a relaxation torque from the dedicated tool is formed, and an outer surface other than the both side surfaces is a curved surface, and the relaxation torque receiving surfaces straddle the axis by the gripping tool. Before Also be gripped head, characterized in that it is arranged at an angle to prevent acceptance of relaxation torque from said gripping tool.

  According to such a specific matter, even if the head is gripped by the gripping tool so as to cross the axis, the relaxation torque receiving surfaces are arranged at an angle that prevents the reception of the relaxation torque from the gripping tool. Therefore, the relaxation torque from the gripping tool cannot be applied to the relaxation torque receiving surface. Thereby, it is possible to prevent the bolt from being loosened by the gripping tool and the nut from being loosened by the gripping tool.

  In the bolts and nuts described above, three of the torque receiving portions may be arranged around the axis at intervals of 120 °.

  In this case, since the three torque receiving portions are arranged at intervals of 120 ° around the axis, it is possible to effectively prevent the bolts from being loosened by the gripping tool and the nuts from being loosened by the gripping tool by arranging a small number of torque receiving portions. Can do.

  In the above-described bolt and nut, the torque receiving portions may be non-uniformly arranged around the axis.

  In this case, since the torque receiving portions are arranged unevenly around the shaft center, the head shapes of the respective bolts and nuts can be made to have different shapes (that is, unique shapes). As a result, a dedicated tool that fits only with each head shape is required, so that the security of the bolt and the security of the nut can be further improved.

  The bolts and nuts, wherein the torque receiving blocking portion and the torque receiving portion on the tightening torque receiving surface side are larger than the distance between the torque receiving blocking portion on the relaxation torque receiving surface side and the torque receiving portion. The interval between and may be wide.

  In this case, since the interval between the torque receiving blocking portion on the tightening torque receiving surface side and the torque receiving portion is wider than the interval between the torque receiving blocking portion on the relaxation torque receiving surface side and the torque receiving portion, tightening from the dedicated tool is possible. The applied torque can be easily applied to the tightening torque receiving surface.

  In the bolts and nuts described above, the bottom surfaces of the gaps between the torque receiving portion and the torque receiving blocking portion adjacent to the torque receiving portion are respectively inclined surfaces that are inclined upward toward the axis. I will do it.

  In this case, the bottom surface of the gap between the torque receiving portion and the torque receiving blocking portion adjacent to the torque receiving portion is an inclined surface that is inclined upward toward the axis, so that the gap also extends in the depth direction. It becomes narrow and it can prevent further that a grasping tool penetrates into this gap.

  ADVANTAGE OF THE INVENTION According to this invention, the volt | bolt and nut which can improve crime prevention can be provided.

Fig.1 (a) is a perspective view of the volt | bolt of one Embodiment concerning this invention, The same figure (b) is a perspective view of the nut concerning this invention. Fig.2 (a) is a top view of the volt | bolt of one Embodiment concerning this invention, The same figure (b) is a top view of the nut concerning this invention. FIG. 3 is a front view of a bolt according to an embodiment of the present invention. 4A is a cross-sectional view taken along the line II shown in FIG. 2A, and FIG. 4B is a cross-sectional view taken along the line II-II shown in FIG. 2B. FIG. 5 is a plan view of a bolt according to another embodiment of the present invention. FIG. 6A is a plan view of a bolt according to still another embodiment of the present invention, and FIG. 6B is a plan view of a bolt according to still another embodiment of the present invention. FIG. 7 is a perspective view of the nut of Patent Document 1. FIG. FIG. 8 is a perspective view of the pliers of Patent Document 2. FIG.

  Hereinafter, the bolt 10 and the nut 11 of the present invention will be described with reference to the drawings. 1A is a perspective view of a bolt according to an embodiment of the present invention, FIG. 1B is a perspective view of a nut according to the present invention, and FIG. 2A is an embodiment according to the present invention. FIG. 3B is a plan view of the nut according to the present invention, FIG. 3 is a front view of the bolt according to the embodiment of the present invention, and FIG. 4A is FIG. (B) is a cross-sectional view taken along the line II-II shown in FIG. 2 (b).

  The bolt 10 according to the present embodiment is a bolt that includes the head 1 that prevents the relaxation by the gripping tool and engages only with the dedicated tool, and can be tightened and relaxed only by the dedicated tool.

  The head 1 has a substantially circular dome shape in plan view, and a thread 6 extends from the lower surface thereof. Further, the outer peripheral edge at the lower end of the head 1 has an outwardly tapered shape. In addition, the head 1 has a torque receiving portion 2 that receives rotational torque from the dedicated tool, and a torque receiving blocking portion 3 that has a curved outer surface and prevents the torque receiving portion 2 from receiving rotational torque other than the dedicated tool. Are alternately arranged around the axis of the head 1. In the present embodiment, three torque receiving portions 2 are arranged at intervals of 120 ° around the axis of the head 1 in plan view, and there are 3 torque receiving blocking portions 3 between these torque receiving portions 2. Are arranged (see FIG. 2A). The bottom surfaces of the gaps 5 between the torque receiving portion 2 and the torque receiving blocking portion 3 adjacent to the torque receiving portion 2 are respectively inclined surfaces 51 that are inclined upward toward the axial center (see FIG. 4A). .

  The torque receiving portion 2 has a tightening torque receiving surface 21 for receiving a tightening torque from a dedicated tool on one side of the both sides, and a relaxing torque receiving surface 22 for receiving a relaxing torque from the dedicated tool on the other surface. In addition, the outer surface other than both side surfaces is a curved surface. The shapes of the tightening torque receiving surface 21 and the relaxation torque receiving surface 22 are shapes that fall substantially vertically from the upper surface of the head 1.

  The relaxation torque receiving surfaces 22 are arranged at an angle that prevents reception of the relaxation torque from the gripping tool even when the head 1 is gripped by the gripping tool so as to straddle the axis of the head 1. In the present embodiment, the relaxation torque receiving surfaces 22 are evenly arranged around the axis of the head 1 at 120 ° intervals.

  Similarly, the tightening torque receiving surfaces 21 are arranged at an angle that prevents the tightening torque from being received from the gripping tool even if the head 1 is gripped by the gripping tool so as to straddle the axis of the head 1. In the present embodiment, the tightening torque receiving surfaces 21 are evenly arranged around the axis of the head 1 at intervals of 120 °.

  Next, tightening and relaxation of the bolt 10 will be described.

  The bolt 10 of the present invention is tightened and relaxed by a dedicated tool (not shown) that engages with the shape of the head 1.

  When a rotational torque is applied to the dedicated tool after the dedicated tool and the head 1 are engaged, the torque receiving portion 2 is subjected to the rotational torque and the bolt 10 is rotated. When tightening, a tightening torque is applied to the tightening torque receiving surface 21 of the torque receiving portion 2. When performing relaxation, a relaxation torque is applied to the relaxation torque receiving surface 22 of the torque receiving portion 2. Thereby, the bolt 10 of the present invention can be tightened and relaxed only by the dedicated tool.

  Here, the case where the bolt 10 of this embodiment is loosened using the pliers 200 (gripping tool) disclosed in Patent Document 2 will be described.

  When the bolt 10 of the present embodiment is to be gripped by the pliers 200, the outer surfaces of the torque receiving portion 2 and the torque receiving blocking portion 3 are curved surfaces, so that the bolt 10 cannot be gripped across the head 1 by the pliers 200. .

  Even if the front pinching teeth 250 projecting from both side ends of the jaw portion 230 of the pliers 200 are made to enter the gap 5 between the torque receiving portion 2 and the torque receiving blocking portion 3 adjacent thereto, the inclination of the gap 5 Since the surface 51 is inclined upward toward the axial center, the front pinching teeth 250 slip and the bolt 10 cannot be gripped across the head 1.

  Further, since the relaxation torque receiving surfaces 22 are arranged at an angle that prevents the reception of the relaxation torque from the pliers 200, the relaxation torque from the pliers 200 cannot be applied to the relaxation torque receiving surfaces 22.

  As described above, even if the head 1 is gripped by the gripping tool so as to straddle the axis, the relaxation torque receiving surfaces 22 are arranged at an angle that prevents the reception of the relaxation torque from the gripping tool. Cannot be applied to the relaxation torque receiving surface 22. Thereby, the bolt 10 can be prevented from being loosened by the gripping tool, and the bolt 10 capable of improving crime prevention can be provided.

  Further, when three torque receiving portions 2 are arranged at intervals of 120 ° around the axis as in the present embodiment, the bolts 10 can be effectively relaxed by the gripping tool by arranging a small number of torque receiving portions 2. Can be prevented.

  Note that the torque receiving portions 2 may be arranged unevenly around the axis of the head 1. In this case, since the torque receiving portions 2 are arranged unevenly around the axis of the head 1, the shapes of the heads 1 of the respective bolts can be different from each other (that is, unique shapes). . Thereby, since the exclusive tool which fits only with each head 1 shape is required, the crime prevention property of the volt | bolt 10 can further be improved.

  Next, a bolt 10 according to another embodiment of the present invention will be described with reference to FIG.

  Since the bolt of this embodiment is different from the above-described embodiment only in the shape of the torque acceptance blocking portion 3, only the differences will be described below, and the same components are denoted by the same reference numerals and the same components are denoted by the same reference numerals. Description is omitted.

  FIG. 5 is a plan view of a bolt according to another embodiment of the present invention.

  In the present embodiment, the distance between the torque reception blocking portion 3 and the torque receiving portion 2 on the tightening torque receiving surface 21 side is larger than the interval 5 between the torque receiving blocking portion 3 and the torque receiving portion 2 on the relaxation torque receiving surface 22 side. 5 is wide.

  In the illustrated example shown in FIG. 5, since the interval between the torque receiving block 3 on the side of the relaxation torque receiving surface 22 and the torque receiving unit 2 is narrowed, the torque receiving unit 2 on the side of the relaxing torque receiving surface 22 and the torque receiving block. It is possible to effectively prevent the gripping tool from entering the gap 5 between the parts 3.

  On the other hand, since the distance between the torque receiving blocking portion 3 and the torque receiving portion 2 on the tightening torque receiving surface 21 side is widened, the tightening torque from the dedicated tool can be easily applied to the tightening torque receiving surface 21. Can do.

  Next, a bolt 10 according to still another embodiment of the present invention will be described with reference to FIG. Since the bolt of the present embodiment is different from the above-described embodiment only in the shape of the torque reception blocking portion 3 and the shape of the torque reception portion 2, only the differences will be described below, and the same components are described below. The same reference numerals are given and description thereof is omitted.

  FIG. 6A is a plan view of a bolt according to still another embodiment of the present invention, and FIG. 6B is a plan view of a bolt according to still another embodiment of the present invention.

  The outer surface of the torque receiving portion 2 of the present embodiment may be designed wider than the outer surface of the torque receiving blocking portion 3 (see FIG. 6A).

  In this case, since the interval between the torque receiving portions 2 can be reduced, it is possible to further prevent the gripping tool from entering between the torque receiving portion 2 and the torque receiving blocking portion 3.

  In contrast to this, the outer surface of the torque receiving blocking portion 3 may be designed wider than the outer surface of the torque receiving portion 2 (see FIG. 6B).

  In this case, since the curved surface of the outer surface of the torque acceptance blocking portion 3 can be widened, it is possible to more effectively prevent the torque receiving portion 2 from being applied with rotational torque.

  As mentioned above, although embodiment of the volt | bolt 10 which concerns on this invention was described, since the nut 11 of this invention is substantially the same as the head 1 of the volt | bolt 10, the description is abbreviate | omitted (FIG.1 (b) ), FIG. 2 (b), FIG. 4 (b)).

DESCRIPTION OF SYMBOLS 1 Head 2 Torque receiving part 21 Tightening torque receiving surface 22 Relaxing torque receiving surface 3 Torque receiving blocking part 5 Gap 51 Inclined surface 10 Bolt 11 Nut

The bolts and nuts according to the present invention each have a head that prevents relaxation by a gripping tool and engages only with a dedicated tool, and can be tightened and relaxed only with the dedicated tool, The head includes a torque receiving portion that receives rotational torque from the dedicated tool, and a torque receiving blocking portion that has a curved outer surface and blocks the torque receiving portion from receiving rotational torque other than the dedicated tool. Alternatingly arranged around the axis of the head, the torque receiving portion has one of its both side surfaces as a tightening torque receiving surface for receiving the tightening torque from the dedicated tool, and the other surface being A relaxation torque receiving surface that receives a relaxation torque from the dedicated tool is formed, and an outer surface other than the both side surfaces is a curved surface, and the relaxation torque receiving surfaces straddle the axis by the gripping tool. Before Also be gripped head, the are arranged at an angle to prevent acceptance of relaxation torque from the gripping tool, than the distance between the relaxation torque receiving surface side of the torque receiving blocking portion and the torque receiving portion, A gap between the torque receiving blocking portion and the torque receiving portion on the tightening torque receiving surface side is wide.

According to such a specific matter, even if the head is gripped by the gripping tool so as to cross the axis, the relaxation torque receiving surfaces are arranged at an angle that prevents the reception of the relaxation torque from the gripping tool. Therefore, the relaxation torque from the gripping tool cannot be applied to the relaxation torque receiving surface. Thereby, it is possible to prevent the bolt from being loosened by the gripping tool and the nut from being loosened by the gripping tool. In addition, the distance between the torque receiving blocking portion on the tightening torque receiving surface side and the torque receiving portion is wider than the interval between the torque receiving blocking portion on the relaxation torque receiving surface side and the torque receiving portion, so that tightening from a dedicated tool is possible. The torque can be easily applied to the tightening torque receiving surface.

Claims (10)

A bolt that prevents loosening by a gripping tool, has a head that engages only with a dedicated tool, and can be tightened and relaxed only by the dedicated tool;
The head includes a torque receiving portion that receives rotational torque from the dedicated tool, and a torque receiving blocking portion that has a curved outer surface and blocks the torque receiving portion from receiving rotational torque other than the dedicated tool. Alternately arranged around the axis of the head,
The torque receiving portion includes a tightening torque receiving surface in which one of both side surfaces receives a tightening torque from the dedicated tool, and a relaxing torque receiving surface in which the other surface receives a relaxing torque from the dedicated tool. And the outer surface other than the both side surfaces is a curved surface,
The relaxing torque receiving surfaces are arranged at an angle that prevents the receiving of the relaxing torque from the gripping tool even when the head is gripped by the gripping tool across the axis. Bolts to do. The bolt according to claim 1,
The bolt is characterized in that three torque receiving portions are arranged around the axis at intervals of 120 °. The bolt according to claim 1,
The bolt, wherein the torque receiving portions are arranged unevenly around the axis. The bolt according to any one of claims 1 to 3,
The distance between the torque receiving blocking portion on the tightening torque receiving surface side and the torque receiving portion is wider than the interval between the torque receiving blocking portion on the relaxation torque receiving surface side and the torque receiving portion. Bolts to do. The bolt according to any one of claims 1 to 4,
The bolts characterized in that the bottom surfaces of the gaps between the torque receiving portion and the torque receiving blocking portion adjacent to the torque receiving portion are inclined surfaces that are inclined upward toward the axis. A nut that prevents loosening by a gripping tool, has a head that engages only with a dedicated tool, and can be tightened and relaxed only by the dedicated tool;
The head includes a torque receiving portion that receives rotational torque from the dedicated tool, and a torque receiving blocking portion that has a curved outer surface and blocks the torque receiving portion from receiving rotational torque other than the dedicated tool. Alternately arranged around the axis of the head,
The torque receiving portion includes a tightening torque receiving surface in which one of both side surfaces receives a tightening torque from the dedicated tool, and a relaxing torque receiving surface in which the other surface receives a relaxing torque from the dedicated tool. And the outer surface other than the both side surfaces is a curved surface,
The relaxing torque receiving surfaces are arranged at an angle that prevents the receiving of the relaxing torque from the gripping tool even when the head is gripped by the gripping tool across the axis. Nuts to do. The nut according to claim 6,
Three torque receiving portions are arranged around the shaft center at intervals of 120 °. The nut according to claim 6,
The nut, wherein the torque receiving portions are arranged unevenly around the axis. The nut according to any one of claims 6 to 8,
The distance between the torque receiving blocking portion on the tightening torque receiving surface side and the torque receiving portion is wider than the interval between the torque receiving blocking portion on the relaxation torque receiving surface side and the torque receiving portion. Nuts to do. The nut according to any one of claims 6 to 9,
The nut characterized in that the bottom surfaces of the gaps between the torque receiving portion and the torque receiving blocking portion adjacent to the torque receiving portion are inclined surfaces that are inclined upward toward the axis.

Images