JPS5846971B2 - Part joining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a bolt-based joining device for members that thin due to drying, such as wood.

When tightening wood with bolts, the tightening nut threaded onto the bolt loosens as the wood thins as it dries.

Such a situation causes a serious problem in tension bolts such as anchor bolts, battledore bolts, dowel tightening bolts, truss tension bars, and timber fastening bolts for construction warehouses.

This type of failure does not simply mean that the nut loosens and returns; tightening the bolt has the same effect as lengthening, so using spring washers and double nuts can prevent this failure. Must not be.

The above matters will be further explained using illustrated examples.

Figure 1 shows a case in which a wooden column a and a girder are connected using battledore bolts c. In this case, the engaging part b' of the girder column a in the notch is made to not come off from the notch. In order to do this, it is necessary that the battledore (pol) c be kept under tension at all times.

However, if the width d of column a is reduced due to drying,
The tension on the battledore bolt c is lost.

In this case, the above-mentioned situation cannot be prevented to the extent that the spring washer is used, but it must have a long spring strength throughout the culm, and this requires a long initial spring length. Even the slightest amount of slack will cause the spring to stretch and lose its effectiveness.

Therefore, if the initial length of the spring is made long, the bolt will protrude from the wall surface, which is impractical.

The present invention was proposed in order to solve such problems, and includes a bolt joining device for members that thin due to drying. With the activation member installed,
An apparatus for joining members, characterized in that the nut is rotated along the bolt as the member becomes thinner due to the urging force of the urging member, and is configured to constantly tighten the member. It is.

Since the present invention is configured as described above, in a device for joining members by bolt tightening, when the member thins due to drying, the tightening nut threaded on the bolt passed through the member in the direction of thinning of the member According to the present invention, the nut rotates along the bolt in response to the tightening of the member by the urging force of the installed urging member, and constantly tightens the member. With this configuration, it is possible to prevent problems caused by thinning of the members due to drying or the like in the member joining device.

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 designates, for example, a tension bolt that passes through the width direction of a pillar a that connects a wooden pillar a and a wooden girder as shown in FIG. 2, and 2 a tightening nut that is threaded onto the bolt 1.

One end of a helical spring 3 constituting the biasing member is fixed to the tightening nut 2 as shown in FIG.
is wound so that the other end is locked in the split groove 4 of the bolt head, and the nut 2 is urged to rotate along the bolt 1 in the tightening direction by the urging force of the spring 3. There is.

Therefore, when the width of the column a is thinned due to drying, the nut 2 rotates along the bolt 1 by the urging force of the spring 3 to constantly tighten the column a.

In the above embodiment, the other end of the spring 3 is fixed to the head split groove 4 of the bolt 1;
For example, it may be fixed to pillar a or the like.

FIG. 4 shows a case where a nut 5 with a detent device is screwed onto the bolt 1 in addition to the tightening nut 2.
A coiled spring 3 has one end fixed to the nut 2 and is wound around the same nut 2.
The other end is fixed to the nut 5 with a detent device.

In this case, when the nut 5 with a detent device is tightened, the tightening nut 2 also rotates on the bolt 1 in the tightening direction to tighten the member.

In the figure, reference numeral 6 denotes a backing, which is used to prevent the tightening nut 2 from sticking due to the double nut effect, and is removed after tightening.

Incidentally, after the tightening of the member by the tightening nut 2 is completed, the helical spring 3 is loaded by further rotating the nut 5 with the detent device.

FIG. 5 shows an embodiment in which the present invention is applied to a tension bar bolt for a truss beam. In the figure, 7 is an upper chord member, 8 is a lower chord member, 9 is a diagonal member, and 10 is a tension bar.

Other parts equivalent to those in the above embodiment are given the same reference numerals.

FIG. 6 shows an embodiment in which the present invention is applied to an anchor bolt 13 for fastening a foundation 12 to a cloth foundation 11 and a battledore bolt 15 for fastening a column 14 to the same foundation 12. Parts equivalent to the examples are given the same reference numerals.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a conventional member joining device, FIG. 2 is a side view showing an embodiment of the member joining device according to the present invention, and FIGS. 3 and 4 are respective illustrations of bolt ends. FIG. 5 and FIG. 6 are side views showing still other embodiments of the present invention. 1...Bolt, 2...Natsuto, 3...
...Tangled spring.

Claims (1)

[Claims] 1. In a bolt joining device for members that thin due to drying, etc., a biasing member is attached to a tightening nut screwed onto a bolt passed through the member in the thinning direction, and the biasing force of the biasing member causes the above-mentioned A device for joining members, characterized in that the nut is rotated along the bolt as the member thins, and is configured to constantly tighten the member.