JPH01307504A - Bolt-nut device and method of using the same - Google Patents

Abstract

PURPOSE:To prevent loosening of a bolt-nut device when a timber tightened by the device is dried and contracted by engaging both ends of a coil spring interposed between the two nuts screwed onto a bolt with lateral arms provided to these nuts, thereby allowing the coil spring to retighten the nuts. CONSTITUTION:Nuts 2, 3 provided with respective lateral arms 4 are screwed onto one end of a bolt 1 tightening a timber 10, and a coil spring 5 is interposed between the nuts 2, 3 with a clearance maintained with the outer periphery of the bolt 1. The extension parts 6 of the coil spring 5 are then engaged with coil spring engaging holes 15 provided on the heads of the lateral arms 4. When the tightened timber 10 is dried and contracted, the tortional force of the coil spring 5 automatically turns the nut 2 to prevent loosening of the nut.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a bolt/nut device that automatically prevents loosening of a bolt/nut tightened on a material to be tightened, and a method of using the same.

``Prior Art'' Conventionally, after completing the construction of a house, wooden square timbers and beams dry and shrink, so they must be tightened once before wall panels, roof panels, ceiling coverings, and other interior work are carried out. However, even after the interior construction work was completed, the square timbers and beams contracted, causing the bolts and nuts to loosen even further, resulting in a defective backlash.

``Problems to be Solved by the Invention'' The object of the present invention is to provide a Portonut device that can automatically tighten dry-shrink wood by tightening it once, without having to tighten it again, and a method of using the same. It is.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the present invention provides a method in which two nuts are screwed together on a port, horizontal arms are provided on these nuts, and a coil spring is interposed between these nuts. Specifies a bolt/nut device in which both ends of the coil spring are extended laterally to engage the respective side arms, a gap is interposed between the inner periphery of the coil spring and the outer periphery of the port, and the coil spring can be tightened. The present invention provides a nut cover for the two nuts of a bolt-nut device in which the other nut of the two nuts described in the above invention is slidably inserted instead of being screwed together, and a lock nut is in contact with the other nut through a concavity and convexity. The bolt-nut device port according to the invention described above, which has a side arm on the cover, is inserted into a through-hole drilled in the wood to be fastened, and the open end of the through-hole is inserted through a washer into the two above-mentioned bolts. The method of using the bolt/nut device according to the above invention is characterized in that the bolt/nut device is tightened by one of the nuts, and in that state, the other nut is rotated to tighten the coil spring.

``Operation'' Therefore, the port l is inserted into the through hole 11 drilled in the wood 10.10 to be tightened, and the bolt head or head nut 13 is inserted into the wood 1.
0.10, or by burying the lower part of the anchor bolt l in the concrete foundation 14 and rotating one nut 2 through the washer 12 to open the open end ll' of the through hole 11. Tighten. In this state, when the other nut 3 is rotated in the tightening direction, the coil spring 5 is tightened in the tightening direction, applying torsional force, and the gap t between the outer diameter of the port 1 and the inner diameter of the spring 5 is reduced. In this state, a tightening force is applied to one nut 2 in the tightening direction by the above-mentioned torsional force, and as the wood 10.10 dries and shrinks, the tightening width in the direction of the through hole 11 of the wood 10.10 also decreases. However, a minute gap is generated between the lower surface of one nut 2 and the surface of washer 12 or wood 10, so that one nut 2 is rotated in the tightening direction by the torsional force of coil spring 5 and does not loosen.

If the other nut 3 is slidably inserted into the port 1 through a through hole rather than a threaded hole, its rotation is stopped by a lock nut 8 that is in contact with the nut 3 through the unevenness 7.

Further, a nut cover 9.9 can be fitted onto the nut 2.3, and the lateral arm 4.4 can be provided via the cover 9.

"Example" A bolt head or a head nut 13 is screwed into one end of the port l (Figs. 1 and 9), or the lower end is bent to form an anchor port l (Fig. 12), or the 1st O As shown in FIG. 11, a mounting plate 1' is provided at one end to form a square piece assembly bolt l. Attach two nuts 2 to the other end of the port 1 above.
．． Screw 3 together.

Each of these nuts 2.3 is provided with a lateral arm 4.4, and a coil spring engagement hole 15 is bored at the tip.

A coil spring 5 is interposed between the nuts 2.3, and both ends of the coil spring 5 are extended laterally so that the tip of the extension portion 6.6 is engaged with the engagement hole 15.15. By interposing a gap E between the inner diameter (inner circumference) of the port 1 and the outer diameter (outer circumference) of the port 1, the coil spring 5 can be tightened. A through hole 16 (Fig. 4) is bored in the other nut 3 of the above-mentioned nuts 2.
1 so that the other nut 3 can be stopped by slidingly inserting the lock nut 3 into contact with the unevenness 7 formed on one surface of the other nut 3 and the unevenness 7 formed on one surface of the lock nut 8 in a male-female engagement state. can. Also, the side arm 4 is the nut 2 above.
It is preferable to provide an unevenness 7.7 between the upper surface of the other nut cover 9 and the lower surface of the lock nut 8 for male and female engagement (see FIG. 4). ).

Then, the above Pol) l is the wood to be tightened such as the above square timber 10.1
0, and tighten the open end 11' of the through hole 11 with one nut 2 through the washer 12. In this state, rotate the other nut 3 to release the coil spring. 5 is used by wrapping it tightly.

"Effect" Since the present invention is configured as described above, the wood to be fastened 10.1
When the nut 0 undergoes dry shrinkage, one of the nuts 2 automatically rotates due to the torsional force of the coil spring 5, thereby preventing the nut 2 from loosening.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the bolt/nut device of the present invention;
The figure is a longitudinal sectional view of the gap between the coil spring and the bolt, Figure 3 is a front view of the nut cover in a tightened state, Figure 4 is a cutaway front view of the other nut and the nut cover, and Figure 5 is a part of Figure 1. An enlarged front view, FIG. 6 is a front view of the other nut embodiment, FIG. 7 is a perspective view of one nut, FIG. 8 is a perspective view of the nut cover, FIG. 9 is a front view of a conventional beam material, 10th
11 is a left side view of FIG. 1O, and FIG. 12 is a front view of a conventional anchor bolt. 1...Boruto, 2.3...Natsuto, 4...side arm, 5...
Coil spring, 6... extension, t... gap, 7... unevenness,
8. Lock nut, 9. Nut cover, lO. Wood to be tightened, 11. Through hole, 11'. Opening end, 12.
・Washer.

Claims (4)

[Claims] (1) Two nuts are screwed onto the bolt, side arms are provided on these nuts, both ends of a coil spring interposed between these nuts are extended laterally, and the extensions are engaged with the side arms, respectively. A bolt and nut device in which a gap is provided between the inner periphery of a coil spring and the outer periphery of a bolt so that the coil spring can be tightened. (2) A bolt-nut device in which the other nut of the two nuts according to claim (1) is slidably inserted instead of being screwed together, and a lock nut is in contact with the other nut through an unevenness. . (3) The bolt/nut device according to claim (1) or (2), wherein a nut cover is fitted to the two nuts, and a side arm is provided on the cover. (4) Insert the bolt into the through hole drilled in the wood to be tightened, tighten the open end of the through hole with one of the two nuts above through the washer, and in this state tighten the other nut. The method of using the bolt/nut device according to claim 1, 2, or 3, wherein the bolt and nut device is rotated to tighten the coil spring.