JP3023469U - Nut and fastening device using the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fastening device capable of securely fastening members by preventing loosening of nuts. [Constitution] A bolt hole penetrating from the bottom surface (2) to the top surface is screwed. A slit (3) is provided on the upper surface so as to cross the bolt hole. The bottom surface (2) is formed in an inverted V shape, and the height from the bottom surface to the top surface is gradually reduced from the peripheral portion toward the bolt hole. The position of the slit (3) corresponds to the top portion (2a) of the inverted V-shaped bottom surface, and the direction of the slit (3) and the top portion (2a) of the inverted V-shaped bottom surface (2) substantially coincide with each other. Is formed in.

Description

[Detailed description of the device]

[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 provided with a bolt hole penetrating from the bottom surface (2) to the upper surface, and the upper surface is provided with a slit (3) so as to cross the bolt hole. When (6) is tightened, the object to be fastened (6) and the bottom surface (2) come into strong contact with each other, and the slit (3) on the top surface is deformed so that the bolt is screwed into the bolt hole due to the deformation. It is characterized in that the bottom surface (2) is provided with unevenness or an inclined surface so that the (5) can be sandwiched from the side.

Further, a bolt hole penetrating from the bottom surface (2) to the top surface is screwed, and a slit (3) is provided on the top surface so as to cross the bolt hole, and the bottom surface (2) has an inverted V shape. It is formed in a V shape, and the height from the bottom surface to the top surface gradually decreases as it approaches the bolt hole from the peripheral edge, and the position of the slit (3) is the top of the inverted V-shaped bottom surface. It is characterized in that it is formed so that the direction of the slit (3) and the top portion (2a) of the inverted V-shaped bottom face are substantially coincident with each other at the location corresponding to (2a).

Further, in the above nut, a resin ring (10) having an inner diameter larger than the hole diameter of the bolt hole is provided on the upper surface side where the slit (3) is formed so as to surround the periphery of the bolt hole. It is characterized by being fixed.

The fastening device of the present invention comprises the above nut (1) and bolt (5), and the threaded portion (5a) of the bolt (5) is formed with minute irregularities. Is characterized by.

Further, it is composed of the nut (1) and the bolt (5), and the apex angle (α) of the thread of the bolt (5) is the apex angle (β) of the thread trough of the nut. It is characterized in that it is larger, or the angle of the apex angle of the nut thread (β ′) is larger than the angle of the apex angle of the bolt thread valley (α ′).

[0009]

Embodiments

 Hereinafter, the present invention will be described with reference to a preferred embodiment. Example 1 FIGS. 1 to 3 are views showing a nut of an example, FIG. 1 is a perspective view, FIG. 2 is a front view, and FIG.

The bottom surface (2) of the nut (1) has an inverted V shape. In this embodiment, the angle θ of the bottom inclined surface with respect to the horizontal plane is 8 °. In addition, on the upper surface of the nut (1), a slit (groove) (3) is provided across the bolt hole at a position corresponding to the top (ridge) of the inverted V-shaped bottom surface (2). The direction of the top (2a) of the inverted V-shaped bottom surface is substantially the same as the direction of the bottom (3). Attach this nut (1) to the bolt (5) and rotate the nut (1) with a tightening tool such as a spanner to tighten it.

When tightened, the end of the bottom surface (2) of the nut (1) comes into contact with the object to be fastened (6). When tightening further, the nut (1) moves to the side of the fastening object (6) (downward in the figure), so the contacting part of the fastening object on the bottom surface of the nut (1) is on the opposite side (upward in the figure). A force is applied to the bottom surface (2a), and the shape of the bottom surface (2a) gradually changes from an inverted V shape to a shape close to a flush surface.

FIG. 4 is a view showing a state where the fastening is completed. As shown in the figure, almost the entire bottom surface (2) is in close contact with the object to be fastened (6), and the upper part of the slit (3) on the upper surface of the nut (1) is close to both sides and the width is narrow. In this state, the upper surface of the nut (1) has a V-shape with the slit (3) as the top.

The threaded portion (4) of the nut (1) moves inward as it approaches the upper surface of the nut, and bites into the threaded portion (5a) of the bolt (5) from the side. As a result, the friction between the threaded portion (4) of the nut (1) and the threaded portion (5a) of the bolt (5) increases, and the nut (1) is less likely to loosen.

Since the difficulty of loosening the nut (1) varies depending on the amount of biting of the nut screw portion (4) into the bolt screw portion (5a), the angle θ of the nut bottom surface (2) with respect to the horizontal plane and the corresponding angle θ It can be changed by changing the width of the slit. The angle θ was 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 (5), rotating the nut (1) requires a slightly stronger force than the conventional one.

[Second Embodiment] This embodiment has the same basic structure as that of the first embodiment, but aims to further increase the friction between the bolt (5) and the nut (1). FIG. 5 is an enlarged cross-sectional view of the joint between the bolt (5) and the nut (1). As shown in the figure, the threaded portion (5a) of the bolt (5) is provided with fine irregularities. When the nut (1) is tightened and the nut screw part (4) bites into the bolt screw part (5a), the unevenness of the surface of the bolt screw part (5a) bites into the nut screw part (4), increasing the friction coefficient. It becomes more difficult to loosen than in the case of 1.

[Third Embodiment] This embodiment also has the same basic configuration as that of the first embodiment, but aims to further increase the friction between the bolt (5) and the nut (1). Figure 6 is an enlarged cross-sectional view of the joint between the bolt and the nut. As shown in the figure, the thread angle α of the bolt thread (5a) is larger than the thread valley angle β of the nut thread (4). Is getting worse. Therefore, when the nut (1) is tightened, the screw threads of the bolt screw part (5a) bite into the thread troughs of the nut screw part (4) like wedges, which increases friction during tightening. It becomes more difficult to loosen. Similarly, the wedge effect as described above can be obtained even if the angle β ′ of the thread of the nut screw portion (4) is made larger than the angle α ′ of the thread trough of the bolt screw portion (5a).

[Fourth Embodiment] FIG. 7 is a perspective view of a fourth embodiment, and FIG. The basic structure is the same as that of the first embodiment, but in this embodiment, a resin (nylon in this embodiment) ring (10) is formed around the bolt hole inside the nut upper surface where the slit (3) is formed. It is fixed so as to surround. When tightening the nut (1), the ring (10) will bite into the bolt screw part (5a) due to the deformation of the nut (1), but it does not bite between the metals, so make sure to bite it strongly. Is hard to damage the screw thread. In this embodiment, the inner diameter of the ring (10) is slightly larger than the diameter of the bolt hole so that the nut (1) can be easily inserted when it is attached. Further, if a colored ring (a ring molded with a resin other than white) is used as the ring (10), the tightening can be confirmed by utilizing the fact that the resin is whitened by the tightening deformation.

[Embodiment 5] Although the bottom surface of the nuts of Embodiments 1 to 4 has an inverted V-shape, the "inverted V-shape" referred to in the present invention is a cutout of the bottom surface as in each of the above embodiments. The cross section of the portion is triangular, and the top portion (2a) is not limited to be sharp (angular), and the top portion (2a ') may have a rounded shape. In this embodiment, as shown in FIG. 9, the shape of the bottom surface (2) is an "inverted V shape" with the top portion (2a ') having a slight roundness. In the case of this embodiment, the same action and effect as those of the above embodiment can be obtained.

[Sixth Embodiment] The above first to fifth embodiments are examples in which the present invention is applied to a hexagonal nut, but the present embodiment is applied to a square nut (11) as shown in FIG. . (12) is an inverted V-shaped bottom surface, and (13) is a slit, and the operation is the same as in each of the above embodiments.

Although the bottom surfaces (2) and (12) are formed in the inverted V shape in each of the above embodiments, the present invention is not limited to this. For example, the inverted U shape may be used. Includes cases where a protrusion is provided on the bottom surface or the bottom surface is cut in an arc shape toward the top surface. That is, instead of making the bottom surface flush, when the nut is tightened, part of the bottom surface makes strong contact with the object to be fastened and the slit on the top surface is deformed so that it narrows and is screwed into the bolt hole. It suffices to be able to pinch the bolt that is on the side. Further, it is not always necessary that the entire bottom surface be in close contact with the object to be fastened in the fastening completed state.

Further, although the invention is applied to the so-called “trapezoidal screw” in which the cross section of the screw thread and the screw trough is trapezoidal in the embodiment, the invention is not limited to this, and the screw thread and the screw trough are not limited to this. 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.

[0023]

[Effect of device]

 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 drawings]

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

FIG. 2 is a front view of the nut according to the first embodiment.

FIG. 3 is a front center vertical cross-sectional view of the nut according to the first embodiment.

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

FIG. 5 is an enlarged cross-sectional view of a joint portion between a bolt and a nut according to the second embodiment.

FIG. 6 is an enlarged cross-sectional view of a joint portion between a bolt and a nut according to the third embodiment.

FIG. 7 is a perspective view of a nut according to the fourth embodiment.

FIG. 8 is a vertical cross-sectional view of the center of the side surface of the nut of the fourth embodiment.

FIG. 9 is a front view of the nut of the fifth embodiment.

FIG. 10 is a perspective view of a nut according to the sixth embodiment.

[Explanation of symbols]

 (1) Nut (2) Bottom (2a) Top of bottom (3) Slit (4) Nut thread (5) Bolt (6) Object to be fastened

Claims (5)

[Scope of utility model registration request] 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 is narrowed, and unevenness or an inclined surface is formed on the bottom surface so that the bolt screwed into the bolt hole can be sandwiched from the side due to the deformation. Nuts. 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. It is formed such that the height from the bottom surface to the top surface gradually decreases as the portion approaches the bolt hole, and the position of the slit is a position corresponding to the top of the inverted V-shaped bottom surface, and the slit and the inverted V shape. A nut characterized in that it is formed such that the directions of the tops of the letter-shaped bottom face substantially coincide with each other. 3. A resin ring having an inner diameter larger than the hole diameter of the bolt hole is fixed to the upper surface side where the slit is formed so as to surround the periphery of the bolt hole. Alternatively, the nut according to claim 2. 4. A fastening device comprising a bolt having fine irregularities formed on the surface of a screw portion and the nut according to claim 1, claim 2 or claim 3. 5. A fastening device comprising a bolt and the nut according to claim 1, claim 2 or claim 3, wherein the apex angle of the thread of the bolt is the apex angle of the thread trough of the nut. Or the angle of the apex angle of the thread of the nut is larger than the angle of the apex angle of the thread trough of the bolt.