JPH0451686B2 - - Google Patents

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 work was completed, the square timbers and beams contracted, causing the bolts and nuts to loosen even further, resulting in defects that caused rattling.

"Problems to be Solved by the Invention" The object of the present invention is to provide a bolt/nut device that can automatically tighten dry shrink wood by tightening it once and without having to retighten it, and a method of using the same. It is something to do.

``Means for Solving the Problems'' The present invention achieves the above object by screwing two nuts onto a bolt in the same direction, providing a horizontal arm on these nuts, and interposing a side arm between these nuts. extending both ends of the coiled spring laterally and engaging the extensions with the side arms, respectively, and interposing a gap between the inner periphery of the coil spring and the outer periphery of the bolt,
The specified invention is a bolt-nut device in which the coil spring can be tightened in the same direction as the screwing direction, and the other nut of the two nuts described in the invention is slidably inserted instead of being screwed, A bolt-nut device in which a lock nut is in contact with the other nut through an uneven surface; A bolt-nut device according to the invention described above, in which a nut cover is fitted to the two nuts, and a side arm is provided on the cover; a bolt is drilled into a piece of wood to be tightened; Insert into the hole,
The opening end of the through hole is tightened by one of the two nuts through a washer, and in this state, the other nut is rotated to tighten the coil spring. It consists of how the bolt/nut device is used.

"Action" Therefore, the through hole 1 drilled in the wood 10, 10 to be tightened
1, and the bolt head or head nut 13 is locked to one side of the wood 10, 10, or the lower part of the anchor bolt 1 is buried in the concrete foundation 14, and the open end of the through hole 11 is inserted. 11' with washer 1
Tighten by rotating one nut 2 through 2. 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 bolt 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 the above-mentioned wood 1
When 0 and 10 dry and shrink, the tightening width in the direction of the through hole 11 of the wood 10 and 10 also decreases, and one nut 2
A minute gap is generated between the lower surface of the nut 2 and the surface of the washer 12 or the wood 10, so that one nut 2 is rotated in the tightening direction by the torsional force of the coil spring 5 and does not loosen.

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

Further, nut covers 9, 9 can be fitted onto the nuts 2, 3, and the side arms 4, 4 can be provided via the covers 9.

"Example" Bolt head or head nut 1 at one end of bolt 1
3 (Figures 1 and 9) or by bending the lower end to form the anchor bolt 1 (Figure 12), or attach a mounting plate to one end as shown in Figures 10 and 11. 1' is provided to form the square timber assembly bolt 1. Two nuts 2 and 3 are screwed onto the other end of the bolt 1, and side arms 4 and 4 are attached to these nuts 2 and 3, respectively.
, and a coil spring engagement hole 15 is bored at the tip. A coil spring 5 is interposed between the nuts 2 and 3, and both ends of the coil spring 5 are extended laterally to extend parts 6 and 6.
The tip of the coil spring 5 is engaged with the engagement holes 15, 15 by interposing a gap t between the inner diameter (inner circumference) of the coil spring 5 and the outer diameter (outer circumference) of the bolt 1. The coil spring 5 can be wound up. A through hole 16 (FIG. 4) is bored in the other nut 3 of the nuts 2 and 3, and the bolt 1 is slidably inserted into the bolt 1 instead of being screwed into the nut. The other nut 3 can be stopped by contacting the grooves 7 formed on one surface of the lock nut 8 in a male-female engaged state. Further, the horizontal arm 4 can be provided on the nut covers 9, 9 fitted to the nuts 2, 3, and unevenness 7, 7 may be provided between the upper surface of the other nut cover 9 and the lower surface of the lock nut 8 to prevent male and female nuts. It is best to match them (see Figure 4).

Then, the bolt 1 is inserted into a through hole 11 made in the timbers 10, 10 to be fastened, such as the square timber, and the open end 11' of the through hole 11 is inserted into the one nut 2 through the washer 12. In this state, the other nut 3 is rotated to tighten the coil spring 5.

"Effects" Since the present invention is configured as described above, when the timbers 10, 10 to be fastened dry and shrink, one of the nuts 2 is automatically rotated by the torsional force of the coil spring 5, and the nut 2 is loosened. It has the effect of preventing

[Brief explanation of drawings]

Fig. 1 is a front view showing the bolt-nut device of the present invention, Fig. 2 is a vertical sectional view of the gap between the coil spring and the bolt, Fig. 3 is a front view of the nut cover in a tightened state, and Fig. 4 is the other nut and A cutaway front view of the nut cover, Figure 5 is a partially enlarged front view of Figure 1,
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, and Fig. 10 is a front view of the embodiment of the other nut.
The figure is a front view of the connection part at the top end of a conventional column.
The figure is a left side view of FIG. 10, and FIG. 12 is a front view of the conventional anchor bolt. 1... Bolt, 2, 3... Nut, 4... Side arm, 5... Coil spring, 6... Extension, t... Gap, 7... Unevenness, 8... Lock nut, 9... Nut cover, 10 ...Wood to be fastened, 11...Through hole, 11'...Open end, 12...Washer.

Claims (1)

[Claims] 1. Two nuts are screwed onto a bolt in the same direction,
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, so that a gap between the inner periphery of the coil spring and the outer periphery of the bolt is formed. A bolt/nut device in which a gap is interposed between the coil spring and the coil spring so that the coil spring can be tightened in the same direction as the screwing direction. 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 via an uneven surface. 3. The bolt/nut device according to claim 1 or 2, wherein a nut cover is fitted onto the two nuts, and a side arm is provided on the cover. 4. Insert the bolt into the hole drilled in the wood to be tightened, tighten the open end of the hole with one of the two nuts above through the washer, and in this state tighten the other nut. 4. The method of using the bolt/nut device according to claim 1, 2 or 3, wherein the bolt/nut device is rotated to tighten the coil spring.