JP2000234611A - Nut for fastening sill of wooden house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain an original fastening condition as much as possible according to the thinning of sills. SOLUTION: In a washer 1, a square hole is formed on the central of a recessed portion 4 on a top surface and a cutting edge 8 for cutting a sill 9 is provided on a bottom surface. The washer 1 is combined with a cylindrical nut by fitting a square latching portion next to a flange portion 11 on an upper edge into the square hole. A threaded portion 7 screwed into an anchor bolt 6 is provided on the cylindrical nut. Then, a spring washer 3 is interposed between the flange portion 11 and the washer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut for tightening a base of a wooden house, which is used for screwing an anchor bolt erected on a base concrete to tighten a wooden base to the base concrete.

[0002]

2. Description of the Related Art A square hole is formed at the center of a concave portion provided on an upper surface, and a washer provided with a cutting blade for cutting a base is provided on a lower surface, and a square locking portion adjacent to a flange at an upper end is formed on the square hole. A structure in which cylindrical nuts are combined so as to coincide with each other, and the cylindrical nuts are provided with screw holes to be screwed into anchor bolts is known, for example, as described in Japanese Utility Model Publication No. Hei 8-10701.

[0003] That is, according to the publication in the same publication, after the anchor is erected on the foundation concrete so that the anchor bolt erected on the foundation concrete is passed through a through hole provided in the foundation, the anchor bolt is mounted on the foundation concrete. At the end, a washer was screwed into a cylindrical nut (with the square hole and the square locking part matched) with a washer fitted and assembled, and then provided on the flange of the nut on the axis of the screw hole. By fitting a tool into the polygonal hole and turning it to tighten it, the base is cut by the cutting blade provided on the lower surface inclined in the radial direction of the washer, and the washer and the flange at the upper end of the cylindrical nut are placed inside the base. It is to be implanted in.

[0004]

In the above prior art, the washer and the cylindrical nut formed separately from each other are combined (assembled) and applied as a tightening nut. Therefore, the lower surface of the flange portion of the cylindrical nut at the time of tightening. It is difficult to make close contact between the washer and the upper surface of the recessed part of the washer in terms of processing accuracy, and so-called play is liable to occur.
This is noticeable by the "thinness" of the base (tree) due to aging, and the tightening force of the base against the foundation concrete by the tightening nut is weakened.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has been devised to provide a base tightening nut which can maintain the initial tightened state as much as possible by following the "thinness" of the base. Things.

[0006]

A square hole is formed in the center of a concave portion provided on the upper surface, and a washer provided with a cutting blade for cutting a base is provided on a lower surface with a square locking portion adjacent to a flange at an upper end. A cylindrical nut is combined with the square hole, and the cylindrical nut is provided with a screw hole for screwing to an anchor bolt. Alternatively, the basic means is that an elastic material such as a rubber piece is interposed, and the basic means is provided with a projection which clamps a washer with a flange on the cylindrical nut, and the cylindrical nut and the washer are integrated. It is intended to be convenient for handling on site by adding a customized configuration.

It is sufficient that the cylindrical nut has a square locking portion at a position adjacent to the flange portion (here, the term “adjacent” includes the case where the cylindrical nut is adjacent via an elastic material. (Includes a case in which a peripheral groove is provided in the cylindrical nut portion between the stopper and the stopper, and the elastic material is integrated with the cylindrical nut by engaging with the peripheral groove.) The entire lower side of the rectangular cylindrical shape or the rectangular locking portion in which the outer shape of the stop portion extends to the lower end may have a cylindrical shape.

Further, according to the present invention, when the cylindrical nut is rotated by a tool, the washer is rotated by the engagement relationship between the square hole and the square locking portion (at this time, the cutting blade cuts the base). However, the locking portion of the tool only needs to be provided on the cylindrical nut, and therefore may utilize the outer peripheral shape or inner peripheral shape of the flange portion. It may be used.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a bottom view, and FIG. FIG. 5 is an exploded view cut away, and FIG. 5 is a sectional view showing a use state.

The base tightening nut A of the embodiment is constructed by integrally mounting a washer 1 and a cylindrical nut 2 via a spring washer 3 as in the embodiment. Instead of caulking the cylindrical nut 2, both may be used in combination at the site (they need not be integrated).

The washer 1 is provided with a concave portion 4 in the center of the upper surface, and the lower surface 1 'is formed as a circular dish-shaped body inclined so as to gradually rise from the center toward the outer peripheral edge. A rectangular hole (a quadrangle in the embodiment, but a hexagonal or other polygonal shape is sufficient) 5 is provided, and the screw of the cylindrical nut 2 with respect to the anchor bolt 6 is provided on three sides of the lower surface 1 ′ at regular intervals. The cutting blades 8, 8, 8 each formed of a slightly spiral protruding strip along the screwing direction of the hole 7 are provided.

The height of the cutting blade 8 is gradually reduced from the center of the washer 1 toward the peripheral end because friction (cutting) resistance with the base 9 when rotating with a tool is reduced. This is to facilitate the operation.

The cutting blade 8 is arranged along the screwing direction of the screw hole 7 with respect to the anchor bolt 6 because the cutting blade 8
This is because the shavings of the base 9 are easily discharged and the bottom surface of the washer 1 is easily brought into close contact with the base 9.

The cylindrical nut 2 is provided with a flange 11 having a thickness smaller than the depth of the concave portion 4 at the upper end of the cylindrical main body 10, and an outer shape which is adjacent to the flange 11 and coincides with the square hole 5. In addition to providing a rectangular engaging portion (corner root portion in the embodiment) 12 having a shape, the screw hole 7 is provided inside the cylindrical main body 10,
The flange 11 is positioned on the axis of the screw hole 7.
A locking portion (hexagonal hole in the embodiment) 13 for locking a tool is provided on the inner side of the rectangular locking portion 12.

The mounting nut A of the embodiment is
The cylindrical main body 10 of the cylindrical nut 2 is passed through the square hole 5 of the washer 1 through the spring washer 3 so that the square hole 5
And the rectangular locking portion 12 are engaged with each other, the washer 1, the cylindrical nut 2 and the spring washer 3 are combined with each other, and the cylindrical main body 10 is subjected to secondary processing so that the protrusion 18 protruding from the peripheral side thereof is formed. The three members are integrally provided with each other (provided by caulking).

The base tightening nut A is screwed into the anchor bolt 6 in the screw hole 7, and the tip of a bit assembled to a tool (for example, an electric impact wrench) is engaged with the locking portion 13.
(At this time, the flange 11 is floated from the bottom surface of the recess 4 of the washer 1 by the spring washer 3 so that it is easy to engage). 9 is fastened to the foundation concrete 14, while the cutting blade 8 cuts the periphery of the through hole 15 of the base 9 and the washer 1 is buried in the base 9, and no unnecessary protrusions are formed on the base 9, 9 is fixedly fastened to the foundation concrete 14.

Even if the anchor bolt 6 protrudes more than the required amount from the foundation concrete 14, the above-described locking portion can be formed so as to surround the anchor bolt 6 and engage with the tip of the bit. The rotation operation can be performed, and the anchor bolt does not interfere.

In the figure, reference numeral 15 denotes an insertion hole formed in the washer 1, as shown in FIG.
After tightening, the tip of the nail 16 is driven into the base 9 through the insertion hole 15, and the washer 1 is securely fixed to the base 9,
Therefore, the spring washer 3 acts even more and the loosening of the cylindrical nut 2 is reliably prevented.

[0019]

The present invention has the configuration described above,
As in the conventional example, the anchor bolts erected on the foundation concrete can be screwed onto the anchor bolts without projecting, and the base can be fastened to the foundation concrete. And a nut for tightening the base that can reliably prevent loosening of the base and maintain the tightened state of the base against the foundation concrete in the initial state.

[Brief description of the drawings]

FIG. 1 is a front view.

FIG. 2 is a plan view.

FIG. 3 is a bottom view.

FIG. 4 is an exploded view with a part removed.

FIG. 5 is a sectional view showing a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washer 2 Cylindrical nut 4 Recessed part 5 Square hole 6 Anchor bolt 8 Cutting blade 9 Base 11 Flange part 12 Square locking part

Claims (2)

[Claims] A square hole is formed in the center of a concave portion provided on an upper surface, and a washer provided with a cutting blade for cutting a base is provided on a lower surface, and a square locking portion adjacent to a flange at an upper end is formed on the square hole. A base tightening nut having screw holes for screwing to anchor bolts is provided on the base nut, and an elastic material such as a spring washer is interposed between the flange and the washer. A nut for tightening the base of a wooden house. 2. A nut for tightening a base of a wooden house according to claim 1, wherein said cylindrical nut and a washer are provided integrally with said cylindrical nut so as to hold said washer with a flange.