JPH05141408A - Washer having coil spring - Google Patents

Abstract

PURPOSE:To enable stable connection by installing a coil spring on a washer, and thereby always compressing a member while utilizing a pressurizing margin and return stress of the coil spring. CONSTITUTION:A bolt 1 is inserted into a wood 1, a coil spring 3 is installed thereto by means of a washer 2, and a a hexagon nut 4 is fastened. A compression coil spring is used for the coil spring 3 which has a pressurizing margin more than an estimated dry contraction of the used wood, or has return stress corresponding to allowable sinking stress of the used wood. When the wood 5 is dried and contracted after fastening, the coil spring 3 is returned by the contraction rate of the wood while keeping compression of the wood 5. The coil spring 3 can be used alone. In case that the washer 2 or the hexagon nut 4 is installed on the coil spring 3, deposition, adhesion, or covering with thermal contraction vinyl can be adopted. This method is effective to the material of plastic, concrete, or metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer equipped with a coil spring and relates to a bolt joining device.

[0002]

2. Description of the Related Art Conventionally, when bolts are tied to timber, the timber is dried and shrunk to loosen the bolts, so that it is necessary to re-tighten and lack strength. In addition, the conventional spring washer (Fig. 4) is a single winding, so it has little pushing force and little strength, so it is not possible to expect tightening against dry shrinkage of wood, check shrinkage of wood and prevent loosening of washers or nuts. Was the purpose. If the dry shrinkage rate of the wood in the fiber direction is 1% to 3% in the case of a general lumber product, a shrinkage dimension of 1.2 mm to 3.6 mm will be obtained for a material having a thickness of 12 cm.

[0003]

Therefore, there is no method for compensating the strength of bolting when the wood is dried and shrunk. The present invention solves these drawbacks.

[0004]

[Means for Solving the Problems] Now, the structure thereof will be described. A) The bolt 1 is passed through the wood 5. (B) Attach the coil spring 3 via the washer 2. C) Tighten the hexagon nut 4. (2) Use a compression coil spring 3 having a pressing margin that exceeds the expected dry shrinkage of the wood used. E) Use a compression coil spring that has a return stress of the allowable penetration stress of the wood used.

[0005]

Next, the operation of the present invention will be described. When the wood 5 is tightened with the bolt 1 and the hexagon nut 4 and then dried and contracted, the coil spring 3 returns to the extent of the contraction and continues to compress the wood.

[0006]

EXAMPLES The following can be applied to the present invention. A) Use the coil spring 3 as a disc spring. B) Use coil spring 3 as a bamboo spring. C) The coil spring 3 is made of elastic rubber. D) Attach washers 2 to both ends of the coil spring 3. E) Attach the hexagon nut 4 to the coil spring 3. f) Attach the washer 2 to one end of the coil spring 3 and the hexagon nut 4 to the other end. G) Attach the coil spring 3 to the nut part of the hexagon bolt. H) Coil spring 3 and washer 2 on the nut part of the hexagon bolt
Attach. Although the coil spring 3 can be used alone, the method of attaching the washer 2, the hexagonal nut 4 and the like to the coil spring 3 includes welding, bonding, and covering with heat shrinkable vinyl. N) The use of the present invention is applicable not only to wood but also to plastic.
Also effective for concrete and metal.

[0007]

Therefore, since the members are constantly compressed by utilizing the pushing margin / return stress of the coil spring, reliable and stable joining can be expected.

[Brief description of drawings]

FIG. 1 is a front view / partial sectional view and plan view of the present invention.

FIG. 2 is a front view of a usage example of the present invention.

FIG. 3 is a front view of an example of using a conventional bolt joint.

FIG. 4 is a front view and a plan view of a conventional spring washer.

[Explanation of symbols]

 1 is a bolt 2 is a washer 3 is a coil spring 4 is a hexagon nut 5 is wood

Claims (1)

[Claims] 1. A washer with a coil spring in which a coil spring is attached to the washer.