JP2001295374A - Spontaneously rotating nut utilizing spring stress - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the looseness of bolts and the like, caused by the drying shrinkage of a structural material for a wooden architecture. SOLUTION: After the bolts, etc., and nuts on the market are used just the way they are for the joint portions of structural members (a beam, a column, a sill, etc.), in the case of the execution of work, they are covered with metallic materials utilizing the spontaneous rotation stress of a spring. Additionally, the bolts, etc., and the nuts having small diameters are fastened by the metallic materials utilizing a different kind of spontaneous rotation stress of the spring and integrated with the ordinary nuts for the purpose of saving labor and time for the execution of work, preventing the looseness of the bolts, etc., caused by the drying shrinkage resulting from a reduction in the water content of the structural material in the long run, and maintaining durability in new construction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building hardware for preventing a reduction in strength of a wooden building.

[0002]

2. Description of the Related Art In ancient wooden constructions, there are few examples of using architectural hardware, and the members (intersections of columns, beams, etc.) of the members maintain their mutual proof strength by various construction methods. However, in recent years, when a large amount of building hardware is used, a method of constructing a main connection portion with a bolt (male screw) and a nut (female screw) has become mainstream.

[0003] However, even after the lumber becomes part of the building after sawing, the moisture content increases and decreases and generally tends to decrease. In some cases, drying shrinkage occurs and the nut (female thread) is loosened. Was.

[0004] Basically, structural analysis by the current method maintains its strength in the short term after completion, but does not consider much the reduction in strength due to drying shrinkage of the structural material, and in the long term, the original strength is reduced. Should be considered not maintained. According to the basis (Fig. 1), although there is an individual difference, it is considered that the decrease due to drying shrinkage of the structural material is about 5 mm until it becomes stable.

[0005]

The problem to be solved is that when the maximum load (horizontal force) considered in the load-bearing wall of a wooden structure occurs (FIG. 2), the bolts are effectively reduced by drying shrinkage. It is difficult to function.

[0006]

According to the present invention, commercially available bolts (male screws) and nuts (female screws) are used as they are,
The point is that a long-term rotational force is applied to the nut portion by using "spring stress", and the structural material and the washer portion are constantly brought into close contact. (Figure 11) ・ (Figure 15)

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS After bolts are attached according to the conventional construction method, the proof strength is maintained with a minimum number of parts, and the invention is realized without affecting the subsequent construction procedure.

[0008]

FIG. 8 shows an "internal section just before installation" of the present invention. The spring has a stress for rotating a nut (female screw), but is limited by a cushioning material. When the spring cover is brought into close contact with the washer at the nail hole (FIG. 9) at the end of the spring cover, the cushioning material comes off and the stress is transmitted to the nut.
(Figure 10)

(Equation) is a calculation formula for accommodating the spiral spring.

[0010]

[Embodiment] (FIG. 13) is a view for applying a stress to a nut (female thread) smaller than that of the above "embodiment". If the bolt has a small diameter, the labor for construction is saved.

[0011]

As described above, according to the construction hardware of the present invention, bolts (male screws) and nuts (female screws) are tightened until the structural material is stabilized for a long time after the construction work is completed. Later, if it was loose, the finish had to be removed, but the invention naturally tightens the nut.

[Brief description of the drawings]

FIG. 1 is a view showing shrinkage of a structural material.

FIG. 2 is an explanatory diagram showing a maximum load (horizontal force) that can be generated on a bearing wall by structural calculation.

FIG. 3 is a main explanatory view showing a portion where the present invention is mounted.

FIG. 4 is a main explanatory view showing a portion where the present invention is mounted.

FIG. 5 shows shapes of a bolt (male thread) and a nut (female thread) which are objects of the present invention.

FIG. 6 is an enlarged view of a “meshing portion” of a commonly used bolt and nut.

FIG. 7 is an enlarged view of a “tolerance” in a “meshed portion” of a commonly used bolt and nut.

FIG. 8 is an internal sectional view of the present invention immediately before installation. (Example)

FIG. 9 is an internal plan view of the present invention immediately before installation. (Example)

FIG. 10 is an internal sectional view of the present invention immediately after installation. (Example)

FIG. 11 shows a state in which the present invention functions due to contraction of the structural material. (Example)

FIG. 12 is an internal plan view after the present invention functions effectively. (Example)

[Formula] This is a formula for producing the present invention (embodiment).

FIG. 13 is an explanatory diagram of hardware applied to a bolt (male screw) having relatively small stress. (Example) Fixing nut A in advance
When the spring is pulled, the adhesive of the fixing nut A (female thread) is filled in the gap between the bolt (male thread) and the spring. It is generated and transmits the rotational force to the nut B (female screw).
(Figure 18)

FIG. 14 shows a state in which the fixing nut A (female screw) and the bolt (male screw) are integrated, and stress is generated in the spring. (Example)

FIG. 15 shows a state in which the present invention is functioning due to contraction of the structure. (Example)

FIG. 16 is a plan view of the present invention, which has a simple structure. (Example)

FIG. 17 is a detailed view of the present invention. (Example)

FIG. 18 is a detailed view for fixing a fixing nut A (female thread) to a bolt (male thread). (Example)

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 9, 2000 (200.5.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 13 is an explanatory view (embodiment) of metal fittings applied to bolts (male screws) having relatively small stress. When the fixing nut A and the nut B (female thread) integrated in advance are attached to the bolt (male thread), the adhesive contained in the fixing nut A (female thread) is inserted into the gap with the bolt (male thread). Filled,
It is integrated with the bolt (male screw). The "spring"
Is generated, and a rotational force is transmitted to the nut B (female screw).

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9

FIG. 10

FIG. 11

FIG.

FIG. 13

FIG. 14

FIG.

FIG. 16

FIG.

FIG. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 6, 2000 (2000.9.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

The calculation formulas for accommodating the spiral springs from (FIG. 8) to (FIG. 12) in the embodiment are as follows. [Relationship between rotation of spiral spring and effective clearance] L1 = maximum diameter L2 = minimum diameter t = thickness of spiral spring n1 = number of turns when stress is released n2 = effective number of turns when maximum stress is applied π = pi [π ( n1 · L1−t · n1 (n1-1) = π (n2 · L2 + t · n2
(N2 + 1) "

Claims (1)

[Claims] Claims 1. In structural materials of wooden buildings, bolts installed on the joints (intersections of pillars, beams, etc.) to prevent a decrease in strength due to drying shrinkage due to a decrease in the water content thereof. Screws) that are tightened for a long time with nuts (female threads) using spring stress.