JP3039649U - nut - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fastening device capable of securely fastening members by preventing loosening of nuts. [Structure] A bolt hole (6) penetrating from the bottom surface (3) to the top surface is screwed. A slit (2) is provided on the upper surface so as to cross the bolt hole (6). The bottom surface (3) is formed in an inverted V shape, and the height from the bottom surface to the top surface is gradually decreased as the bolt hole (6) is approached from the peripheral portion. By forming a notch (4) on the top (3a) of the inverted V-shaped bottom surface (3), a thin part (5) is formed between the notch (4) and the bolt hole (6). ing. Slit (2)
Is a position corresponding to the top portion (3a) of the inverted V-shaped bottom surface (3), and the direction of the slit (2) and the top portion (3a) of the inverted V-shaped bottom surface (3) are substantially aligned. Has been formed.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a nut and a fastening device using the nut.

[0002]

[Prior art and its problems]

 The nut is used together with the bolt to fix the plate material. This is done by screwing the nut onto a bolt and tightening it with a tightening tool such as a spanner. However, if vibration is applied to the fastening part, the tightening nut may rotate in the direction opposite to the tightening direction, loosening the tightening or coming off the bolt. In such a state, smooth operation and use of the equipment and the device may be hindered, and the strength of the device and the structure may be deteriorated, which is not preferable.

In order to prevent such an inconvenience, conventionally, a first nut that is screwed in first is tightened continuously with two nuts for one bolt, and a second nut that is screwed in later is used. A so-called "double nut" method was sometimes used to prevent loosening by pressing with a nut. However, this method has the problem that the amount of nuts required is doubled, which increases the number of parts and the number of assembly steps. Therefore, it is an object to provide a fastening device that has a small number of parts, can be mounted with a small number of steps, and that does not easily loosen the nut.

[0004]

[Means for Solving the Problems]

 The nut (1) of the present invention is screwed with a bolt hole (6) penetrating from the bottom surface (3) to the upper surface, and the upper surface is provided with a slit (2) across the bolt hole (6). When tightening the fastening object (10), the fastening object (10) and the bottom surface (3) come into strong contact with each other and the slits (2) on the top surface are deformed so that the bolt holes (6) are deformed. The bottom surface (3) has an uneven surface or an inclined surface so that the screwed bolt (11) can be sandwiched from the side, and the peripheral edge of the bottom surface (3) corresponding to the slit (2). A notch (4) is provided upward on the part side, and a thin portion (5) is formed between the notch (4) and the bolt hole (6). To do.

Alternatively, a bolt hole (6) penetrating from the bottom surface (3) to the upper surface is screwed, and a slit (2) is provided in the upper surface so as to cross the bolt hole (6). (3) is formed in an inverted V shape, and the height from the bottom surface to the top surface is gradually reduced as the edge approaches the bolt hole (6). By forming a notch (4) upward on the top (3a) of 3), a thin part (5) is formed between the notch (4) and the bolt hole (6), and the slit (4) is formed. The position of (2) corresponds to the top portion (3a) of the inverted V-shaped bottom surface (3), and the direction of the slit (2) and the top portion (3a) of the inverted V-shaped bottom surface (3). Are formed so as to substantially coincide with each other.

[0006]

Embodiments

 Hereinafter, the present invention will be described using preferred embodiments. [Embodiment 1] FIG. 1 is a perspective view of this embodiment, FIG. 2 is a plan view (A), a front view (B) and a bottom view (C), and FIG. 3 is a side view (A) and a sectional view taken along line AA ( B).

The bottom surface (3) of the nut (1) has an inverted V shape. A notch (4) is provided on the top (3a) of the top. The notch (4) does not reach the bolt hole (6) inward, and only the notch (4) is provided between the bolt hole (6) and the notch (4) compared to other parts. A thin portion (5) having a small thickness is formed. In the present embodiment, the thin portion (5) has a thickness of about 1 mm between the notch (4) and the ridge of the bolt hole (6), but the shape of the notch (4) and the nut (1) are different. It may be appropriately determined depending on the material and size, the shape of the bottom surface (3), and the like.

The shape of the notch (4) in this embodiment is a triangular shape having a rounded top (4a). The reason why the top part (4a) is rounded instead of being angular is that stress is concentrated on the top part (4a) when the thin part (5) extends left and right by tightening the nut (1) as described later. This is to prevent it from tearing. However, the shape of the notch (4) can be appropriately changed depending on the shape of the bottom surface (3), the material of the nut (1), etc., and is not necessarily limited to the shape of this embodiment, and for example, a simple shape It may be a triangular shape, an inverted U shape, a square shape, or the like.

Further, on the upper surface of the nut (1), a slit (groove) (2) is formed across the bolt hole at a location corresponding to the top (ridge) (3a) of the inverted V-shaped bottom surface (3). The direction of the slit (2) and the direction of the inverted V-shaped bottom surface (2a) are substantially aligned. Therefore, the notch is provided on the peripheral edge side (the side opposite to the bolt hole) of the bottom surface (3) corresponding to the slit (2).

When the nut (1) is attached to the bolt (11) and the nut (1) is rotated and tightened with a tightening tool such as a wrench, the end of the bottom surface (3) of the nut (1) is Contact the fastening object (10). When the nut (1) is further tightened, the nut (1) moves toward the fastening object (10) side (downward in FIG. 4), so that the fastening object contact portion on the bottom surface of the nut (1) is relatively on the opposite side (see FIG. 4). A force is applied to the bottom surface (3), and the shape of the bottom surface (3) gradually changes from an inverted V shape to a shape close to a flush surface. At the same time, the thin part (5) is pulled downwards to the left and right and extends (the area becomes wider while the thickness becomes thinner). Due to the extension of the thin portion (5), the nut (1) is easily deformed as compared with the case where the bottom surface is simply formed into an inverted V shape.

FIG. 4 is a diagram showing a state in which the fastening is completed. As shown in the figure, almost the entire bottom surface (3) is in close contact with the object to be fastened (10), and the upper part of the slit (2) on the upper surface of the nut (1) has both sides close to each other and the width becomes narrow. In this state, the upper surface of the nut (1) has a V-shape with the slit (2) as the top.

The screw part of the nut (1) moves inward as it approaches the upper surface of the nut, and bites into the screw part of the bolt (11) from the side. As a result, friction between the threaded portion of the nut (1) and the threaded portion of the bolt (11) increases, and the nut (1) is less likely to loosen.

Further, even if the nut (1) tries to return to its original shape, the thin portion (5) that has once been extended and expanded is stretched to prevent the shape from returning. Therefore, the threaded portion of the nut (1) is kept in the threaded portion of the bolt (11), and the nut (1) is harder to loosen.

Since the degree of difficulty of loosening the nut (1) changes depending on the amount of the nut screw biting into the bolt screw portion, the angle θ of the nut bottom surface (3) with respect to the horizontal plane and the width of the corresponding slit are changed. It can be changed. The angle θ is preferably about 3 ° to 12 °.

When it is necessary to remove the nut (1), use a wrench or the like to rotate the nut (1) in the opposite direction to the tightening as in the usual case. Due to the increased friction between the threads of the bolt (11), a slightly stronger force is required to rotate the nut (1) compared to the conventional one.

In the above embodiment, the bottom surface (3) has an inverted V shape, but the present invention is not limited to this. For example, an inverted U shape or a protrusion on the bottom surface. Including cases where parts are provided or the bottom surface is cut out in an arc shape toward the upper surface side. That is, when the nut is tightened, a part of the bottom surface makes strong contact with the object to be fastened without deforming the bottom surface, and the slit on the top surface is deformed so as to be narrowed, and this deformation causes the bolt to be screwed into the bolt hole. It suffices to be able to pinch from the side. In addition, it is not always necessary that the entire bottom surface be in close contact with the object to be fastened in the tightened state.

Further, in the embodiment, the invention is applied to a so-called “trapezoidal screw” in which the cross section of the screw thread and the screw valley is trapezoidal, but the present invention is not limited to this, and the screw thread and the screw valley are It can also be applied to screws with other cross-sectional shapes such as a “square screw” with a square cross section and a “round screw” (“Dharma screw”) that is a circular arc with continuous cross sections of threads and valleys. In particular, round screws are easy to screw on, but easy to loosen, so the application of the present invention is effective.

[0018]

[Effect of the invention]

 As described above, according to the present invention, it is possible to provide the fastening device capable of preventing the nut from loosening and securely fastening the members.

[Brief description of the drawings]

FIG. 1 is a perspective view of a nut according to an embodiment.

FIG. 2 is a diagram showing a front view, a plan view, and a bottom view of a nut of the embodiment.

FIG. 3 is a view showing a side view and a cross-sectional view of a nut of the embodiment.

FIG. 4 is a cross-sectional view showing a state in which the nut of the embodiment is tightened.

[Explanation of symbols]

 (1) Nut (2) Slit (3) Bottom (3a) Top of bottom (4) Notch (4a) Top of notch (5) Thin section (6) Bolt hole (10) Fastening object (11) Bolt

Claims (2)

[Utility model registration claims] 1. A bolt hole penetrating from a bottom surface to an upper surface is screwed, and a slit is provided in the upper surface so as to traverse the bolt hole. The bottom surface has strong contact and is deformed so that the slit on the top surface narrows, and the unevenness or inclined surface is formed on the bottom surface so that the bolt screwed into the bolt hole can be sandwiched from the side. A nut characterized in that a notch is provided upward on a peripheral edge side of a portion corresponding to the slit, and a thin portion is formed between the notch and the bolt hole. 2. A bolt hole penetrating from the bottom surface to the top surface is screwed, a slit is provided in the top surface so as to traverse the bolt hole, and the bottom surface is formed in an inverted V shape and has a peripheral edge. The height from the bottom surface to the top surface gradually decreases as the portion approaches the bolt hole, and a notch is provided at the top of the inverted V-shaped bottom so that the notch and the bolt are provided. A thin portion is formed between the holes, and the position of the slit is a position corresponding to the top of the inverted V-shaped bottom face, and the directions of the slit and the top of the inverted V-shaped bottom face are substantially the same. A nut characterized by being formed.