JP4032376B2 - Fastener - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
In the present invention, a metal band, a wire, a resin belt, etc. are used to tighten a nut from the outer periphery and tighten it in an optimum state by continuously adjusting the nut, not in a stepwise manner. The present invention relates to a fastener that has a structure and can be manufactured at low cost.
[0002]
[Prior art]
Generally, there are bolts and nuts for attaching objects by screwing, and as shown in FIG. 9, a mountain slope of the male threaded portion 6 of the bolt 5 is illustrated on the valley slope of the female threaded portion 2 of the nut 1. Since it is intended to be fixed by pressing it in the direction of the arrow (direction parallel to the axis), loosening due to vibration is inevitable. Various proposals have been made to solve this problem. However, as represented by double nuts and washers, for example, a spring force is applied in the axial direction to absorb vibrations that cause looseness. However, frequent maintenance and inspections are inevitable because even fine vibrations can cause looseness.
[0003]
In order to solve this problem, various so-called split nuts have been proposed. However, there is a disadvantage that the structure is complicated and a specially structured nut has to be manufactured, which increases the cost and cost. However, there is a drawback that it is practically impossible to arrange various sizes. Also, in the case of split nuts, there are combinations of nut pieces, so the handling is complicated, and even tightening from the outer periphery is gradual, so a delicate tightening method according to each combination of bolt and nut Was impossible, and secure tightening could not be expected.
[0004]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that when tightening a nut from the outer periphery, the tightening operation can be performed in an optimum state by continuously adjusting the tightening even though it is a simple structure. It will be possible to manufacture.
[0005]
[Means for Solving the Problems]
In the present invention, a slit 3 is provided in a part of a nut 1 having a female screw portion 2 corresponding to a male screw portion 6 of a corresponding bolt 5 so as to penetrate from the outer periphery to the female screw portion 2 over the entire width in the thickness direction. The circumferential locking groove 4 is recessed in the outer periphery of the nut 1, the female screw part 2 is screwed onto the male screw part 6 of the bolt 5, and the binding member 7 wound around the locking groove 4 is tightly coupled. The main feature is that the female screw portion 2 is crimped to the male screw portion 6.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the nut 1 has a female screw portion 2 on the inner periphery, and a slit 3 penetrating from the outer periphery to the female screw portion 2 is provided over the entire width in the thickness direction. A circumferential locking groove 4 is provided on the outer periphery of the nut 1. The locking groove 4 is preferably formed in a substantially cylindrical shape, but can be hexagonal, square, or the like depending on the shape of the head of the nut 1. Even in that case, it is better to round the corners. Thus, the male screw portion 6 of the bolt 5 is screwed with the female screw portion 2. The binding member 7 is temporarily fixed in the locking groove 4, and the bolt 5 is screwed to a predetermined position. By tightening 7, the female screw portion 2 can be crimped to the male screw portion 6.
[0007]
The size is not limited. For example, the diameter of the female screw portion 2 can be applied from about 1 mm to about 2000 mm. Small materials may be resin or metal, but large sizes may be determined according to the application, such as iron, aluminum, brass, stainless steel, high-speed steel, etc. The binding member 7 is not particularly limited, and any binding member 7 can be used as long as it can be wound around the outer periphery and continuously tightened. A general hose band or a stainless steel wire can be easily applied.
[0008]
The female screw portion 2 is preferably provided with a split groove 8 facing the slit 3 and substantially parallel to the axis. In particular, when the size is increased, it is preferable to have the dividing groove 8. The dividing groove 8 is for smoothly tightening with the bundling member 7, and may be provided on the extended surface of the slit 3 as shown in the figure, or may be provided at a shifted position. A plurality of them can also be provided.
[0009]
FIG. 2 shows a hose band type bundling member 7 attached to the engaging groove 4 on the outer periphery of the nut 1 and tightened. FIG. 3 shows a stainless steel wire instead of the bundling member 7.
[0010]
In the manufacture of the fastening tool of the present invention, first, a normal nut 1A having a female screw portion 2 is prepared as shown in FIG. 4, and the slit 3 and the split groove 8 as shown in FIG. Is to be applied. This is suitable for manufacturing in small quantities or with various changes in size. It is also suitable when accuracy of materials and dimensions is required.
[0011]
As another manufacturing method, the outer shape of the nut 1, the female thread portion 2 and the slit 3, and, if necessary, the split groove 8 can be simultaneously formed at the time of forging the nut with a bit. This is a suitable method for mass production.
[0012]
FIG. 6 illustrates the operation of the present invention, and the opening dimension of the slit 3 before the binding member 7 is fastened is D (indicated by an imaginary line). Here, when the bundling member 7 is fastened as indicated by a solid line, the slit 3 is deformed in the direction of the arrow and contracted to the dimension d. This is shown in FIGS. 7 and 8 in a longitudinal section parallel to the axial direction. That is, there is a play between the male and female screw portions 2 and 6 before tightening, and the bolt 5 can be screwed into the nut 1 smoothly. When the bolt 5 and the nut 1 are in a predetermined position and the binding member 7 is tightened, the female screw portion 2 of the nut 1 is fastened to the male screw portion 6 of the bolt 5 in the direction toward the center of the shaft as shown in FIG. .
[0013]
The tightening by the binding member 7 is performed continuously, and the male and female screw portions 2 and 6 can be tightened until the peaks and valleys thereof are in close contact with each other as shown in FIG. Loosening is possible by loosening the binding member 7. If the binding member 7 is a wire or the like, it may be cut.
[0014]
【The invention's effect】
In the present invention, a slit 3 penetrating from the outer periphery to the female screw portion 2 is provided in a part of the nut 1 over the entire width in the thickness direction, and the circumferential locking groove 4 is recessed in the outer periphery of the nut 1. The female screw portion 2 is screwed onto the male screw portion 6 of the bolt 5, and the binding member 7 wound around the locking groove 4 is fastened so that the female screw portion 2 is crimped to the male screw portion 6. Therefore, the nut 1 can be tightened until the slit 3 is continuously narrowed by tightening of the bundling member 7 and is tightly attached to the male screw portion 6 of the female screw portion 2 bolt 5. Even if there is some variation in the nut, the tightening can be continuously adjusted to cope with the subtle and sure in the optimum state and perform the firm tightening. In addition, the tightening direction is not a force in a direction parallel to the conventional shaft, but a direction toward the center of the bolt shaft, so that the valleys of the male and female screw portions 2 and 6 are in contact with a wide surface of the mountain. As a result, a large frictional force can be obtained and tightening that is difficult to loosen can be performed. Furthermore, since a slit can be machined into a normal general-purpose nut by cutting or simultaneously formed at the time of manufacturing the nut, a conventional nut material can be used as it is, and the cost can be greatly reduced. In particular, a large size nut for a vehicle or the like can be easily applied without introducing a particularly large facility, so that the range of utilization is widened.
[0015]
Further, since the bolt 1 has the female screw portion 2 corresponding to the male screw portion 6 of the corresponding bolt 5, the screwing operation of the nut 1 is simply and smoothly tightened to the final position without any difference from the conventional nut. Further , since the binding member 7 fits into the locking groove 4, the square shape of the head of the nut 1 can be maintained, and the tightening adjustment with a jig such as a wrench is not impaired. In addition, when the dividing groove 8 is provided, it is easy to bind and is useful in the case of a large size nut.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of the present invention.
FIG. 2 is a perspective view of the above-described binding member binding upper body.
FIG. 3 is a perspective view of another embodiment of the same.
FIG. 4 is a plan view of a known nut that is a material of the present invention.
FIG. 5 is a plan view of the nut of the present invention.
FIG. 6 is an explanatory diagram of the operation in the tight state of the present invention.
FIG. 7 is a longitudinal sectional view before tightening.
FIG. 8 is a longitudinal cross-sectional view of the above-described tightly-tightened state.
FIG. 9 is a longitudinal sectional view of a conventional nut tightened state.
[Explanation of symbols]
1 Nut 2 Female thread part 3 Slit 4 Locking groove 5 Bolt 6 Male thread part 7 Bundling member

Claims (2)

A part of the nut 1 having the female screw portion 2 corresponding to the male screw portion 6 of the corresponding bolt 5 is provided with a slit 3 penetrating from the outer periphery to the female screw portion 2 over the entire width in the thickness direction. A circumferential locking groove 4 is recessed on the outer periphery, the female screw portion 2 is screwed onto the male screw portion 6 of the bolt 5, and a binding member 7 wound around the locking groove 4 is tightened to tighten the female screw. A fastening tool characterized in that the portion 2 is crimped to the male screw portion 6. A part of the nut 1 having the female screw portion 2 corresponding to the male screw portion 6 of the corresponding bolt 5 is provided with a slit 3 penetrating from the outer periphery to the female screw portion 2 over the entire width in the thickness direction. The female screw portion 2 is provided with a split groove 8 facing the slit 3 and substantially parallel to the shaft, a circumferential locking groove 4 is provided on the outer periphery of the nut 1, and the male screw portion 6 of the bolt 5 is provided with the above-mentioned A fastening tool, wherein the female screw portion 2 is screwed together, and the bundling member 7 wound around the locking groove 4 is fastened so that the female screw portion 2 is crimped to the male screw portion 6.

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