JP2002242920A - Foundation tightening nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the cutting of an insertion hole periphery part of a foundation by a cutting blade smoothly in a short time, to rapidly and easily bury a flange part in the foundation at the same plane with a less noise and to certainly tighten and fix the foundation to a base concrete. SOLUTION: A nut main body 1 comprises a cylindrical part 2 and a flange part 3 continuously provided on an upper end of the cylindrical part 2 and a polygonal receiving hole 4 of engaging a tool is provided at a center part of an upper surface of the nut main body 1. A thread part 7 communicated with a center part of the receiving hole 4 and threadly engaged with an anchor bolt 6 is provided on an inner surface of the cylindrical part 2 and a lower surface of the flange part 3 is made to a circular bottom surface 3a with a lower expansion which is gradually raised from the center part toward a periphery end direction. A plurality of cutting blades 9 for cutting a foundation 8 made of wood placed on a base concrete 5 are recessedly provided on the circular bottom surface 3a at an equal interval by a driving processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut for fastening a wooden base to a foundation concrete by screwing it to an anchor bolt erected on the foundation concrete.

[0002]

2. Description of the Related Art Conventionally, a nut for tightening a base of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-96414, and FIG.
As shown in FIG. 7, a nut body 20 is constituted by a cylindrical portion 21 and a flange portion 22 provided continuously at an upper end of the cylindrical portion 21, and a hexagonal tool locking portion is provided on an upper surface of the nut main body 20. And a screw portion 24 communicating with the central portion of the receiving hole 23 and screwing with the anchor bolt is provided on the inner surface of the cylindrical portion 21, and the lower surface of the flange portion 22 is And a slope that gradually rises from the part in the circumferential end direction, and
On the lower surface, a plurality of cutting ridge blades 25... 25 for cutting a wooden base placed on the foundation concrete are provided in a protruding manner.

[0003] Then, the tightening nut is screwed into a screw portion of an anchor bolt erected on the foundation concrete,
When the tip of the bit assembled to the electric impact wrench is engaged with the receiving hole 23 and rotated, the tightening nut descends along the anchor bolt to tighten the base to the foundation concrete while the cutting ridge blade 25 The flange 22 is embedded in the base by cutting the periphery of the insertion hole of the base, and the base is fixedly fastened to the foundation concrete.

However, in order to improve the adhesion between the bottom surface of the flange portion 22 and the cutting surface of the base, the cutting ridge blade 25 of the tightening nut is provided from the central portion of the flange portion 22 to the peripheral end direction. It has a structure in which the protruding height is gradually reduced, that is,
Near the peripheral edge of the flange 22, the height of the cutting ridge blade 25 is almost nil. Therefore, the cutting edge of the cutting ridge blade 25 at the peripheral edge portion where the cutting area is the largest becomes very poor. ing. As a result, the thickness t of the peripheral end of the collar 22
It takes time to dig into the base until it is flush with the base and embed it, and at the time of burying, forcibly screw the flange 22 with poor sharpness at the peripheral end onto the base with an electric impact wrench As a result, there is a problem in that the impact wrench is frequently hit and the loud sound is emitted for a long time. In addition, when mass production of the tightening nut is to be performed by, for example, forging with a forging machine, a cutting protruding blade is formed by pushing a material into a blade forming groove formed in a die. According to such molding, it is very difficult to form the edge of the cutting ridge blade, and there is also a problem that it is difficult to make the edge of the cutting ridge edge sharp.

[0005] In view of the above, the present invention provides a cutting blade capable of sharply cutting the periphery of the through hole of the base with a cutting blade in a short time, and the flange can be quickly and easily embedded with little noise in the base. It is an object of the present invention to provide a base tightening nut capable of securely tightening and fixing the base to the foundation concrete.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 of the present application is to form a nut main body by a cylindrical portion and a flange portion continuously provided at an upper end of the cylindrical portion. A receiving hole for locking a polygonal tool is provided at the center of the upper surface of the nut main body, and a screw portion communicating with the center of the receiving hole and screwing with the anchor bolt is provided on the inner surface of the cylindrical portion. On the other hand, the lower surface of the flange portion is an arc-shaped bottom surface of a downward bulge gradually rising from the center portion toward the peripheral end, and a plurality of cuttings for cutting the base placed on the foundation concrete on the arc-shaped bottom surface. It is characterized in that the blades are recessed by driving at equal intervals.

According to a second aspect of the present invention, in the configuration of the first aspect, the cutting blade extends from the center of the arc-shaped surface of the flange toward the peripheral end, and extends from the center to the peripheral end. The height of the blade is maintained at a predetermined height, and the front side of the cutting blade 9 rises from the valley of the cutting blade 9 to the front thereof and gradually becomes continuous with the arc-shaped bottom surface. It is characterized in that a gently inclined shavings relief surface is formed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a nut for tightening a base according to the present invention. The nut N is constituted by a cylindrical portion 2 and a flange portion 3 provided at an upper end of the cylindrical portion 2 to form a nut main body 1. I have. In the center of the upper surface of the nut main body 1, a hexagonal receiving hole 4 for locking a tool is provided, and the inner surface of the cylindrical portion 2 communicates with the central portion of the receiving hole 4.
The threaded portion 7 to which the anchor bolt 6 erected on the foundation concrete 5 shown in FIG. On the other hand, the collar 3
The lower surface is formed as a downwardly bulging arc-shaped bottom surface 3a which gradually rises from the center toward the peripheral end, and a wooden base 8 to be placed on the foundation concrete 5 is cut on the arc-shaped bottom surface 3a. The three cutting blades 9 are recessed at equal intervals by driving.

Each of the cutting blades 9 extends radially from the center of the arcuate bottom surface 3a of the flange 3 toward the peripheral end thereof, as shown in FIGS. The height h of the blade is maintained at a predetermined height up to the end, and on the front side of the cutting blade 9, from the trough of the cutting blade 9 toward the front thereof, gradually rises to the arc-shaped bottom surface 3 a. A gently inclined shavings relief surface 10 is formed.

In manufacturing the tightening nut N, first, a multi-stage press forming machine is used, and the nut main body 1 excluding the screw portion 7 by the press forming by the forming machine is sequentially sequentially coarsely to finely. The screw forming is performed in a post-process. Here, the cutting blade 9 formed on the flange 3 is formed by the flange 3 of the intermediate material formed in the previous step during the punching operation of the punch on the die side in the molding machine.
By cutting the arc-shaped bottom surface 3a, it is possible to easily and accurately form the edge, and the edge thereof can be formed at an acute angle.

As the tool, an electric impact wrench (not shown) is used as shown in FIG. 5, and a hexagonal shape whose leading end engages with the receiving hole 4 is provided at the tip of the impact wrench main body. A bit 11 having a vertical hole 11a through which the anchor bolt 6 can be inserted is detachably attached to the center of the bit.

In the drawing, reference numeral 12 denotes an upper surface of the flange portion 3,
A hexagonal concave groove formed concentrically with the hole 4 on the outer periphery of the receiving hole 4.

Next, the operation of the base tightening nut configured as described above will be described. First, the insertion holes 8a of the wooden base 8 are inserted into the anchor bolts 6 erected on the base concrete 5, and the base 8 is placed on the base concrete 5. Next, the tightening nut N is screwed into the screw portion 6a of the anchor bolt 6 that penetrates through the base 8 and protrudes upward, and then the tip of the bit 11 assembled to the electric impact wrench is connected to the nut N It engages with the receiving hole 4 and rotates. Thereby, as shown in FIG. 5, the nut N descends along the anchor bolt 6, the cylindrical portion 2 enters into the insertion hole 8a of the base 8, and the flange 3 fastens the base 8 to the foundation concrete 5. At this time, the cutting blades 9... 9 provided on the lower surface of the flange 3 cut the periphery of the insertion hole 8 a of the base 8, the flange 3 is embedded in the base 8, and the base 8 is tightened to the foundation concrete 5. Fixed.

Here, the cutting blade 9 extends from the central portion of the arc-shaped bottom surface 3a of the flange portion 3 toward the peripheral edge, and the height h of the blade is maintained at a predetermined height from the central portion to the peripheral edge. Therefore, when cutting the periphery of the insertion hole 8 a of the base 8 with the cutting blade 9, the sharpness up to the peripheral end of the flange 3 is sharp.
In addition, cutting can be performed reliably in a short time. Further, on the front side of the cutting blade 9, a gently-sloping shavings relief surface 10 is formed which is formed from the valley of the cutting blade 9 toward the front thereof and gradually rises so as to be continuous with the arc-shaped bottom surface 3 a. As a result, the cuttings are guided to the shavings relief surface 10 and are quickly discharged to the outside from the relief surface 10. Therefore, when the thickness portion t at the peripheral end of the flange portion 3 is cut into the base 8 until it is flush with the base 8, the embedded portion can be embedded in a short time, and the flange 3 can be embedded by an electric impact wrench. When screwing into the impact wrench, it is possible to reduce the number of hits of the impact wrench, thereby reducing noise. In addition, when the flange 3 is embedded in the base 8, the three arc-shaped bottom surfaces 3 a of the flange 3 and the cut surface of the base 8 are securely in close contact with each other, and the base 8 is securely fixed to the foundation concrete 5. can do.

Each of the cutting blades 9 formed on the flange 3
.. 9 are recessed in the arc-shaped bottom surface 3a of the flange 3, so that when the nut main body 1 is formed by driving a punch into a die in a forging machine, the flange of the intermediate material formed in the previous step is formed. The cutting blades 9... 9 can be easily and accurately formed by cutting the arc-shaped bottom surface 3 a of the portion 3. Thereby, the edge of each of the cutting blades 9... 9 can be formed at an acute angle while the nut main body 1 can be mass-produced by the forging machine.

In the above-described embodiment, the shavings relief surface 10 is formed relatively short, but as shown in FIG. 6, for example, as shown in FIG. May be configured to rise more gradually from the trough to the arc-shaped bottom surface 3a. In addition, the cutting blade 9
In addition to being provided radially from the center to the peripheral edge of the arc-shaped bottom surface 3a, for example, as shown in FIG. 7, the arc-shaped bottom surface 3a may be provided in an arc that curves forward toward the center. With this configuration, the initial bite can be softened. Furthermore, in the above-described embodiment, the case where three cutting blades 9... 9 are provided on the lower surface of the flange portion 3 has been described. However, the present invention is not limited to three, and two or four or FIG.
As shown in FIG. Further, the height h of the adjacent cutting blades 9, 9 may be configured to be slightly different from each other. For example, when four cutting blades 9 are provided,
The heights h of the adjacent cutting blades 9, 9 are alternately provided with a slight difference in height. With this configuration, the cutting blade 9 that is the leading edge of the cutting can be set in advance to improve the cutting performance.

The receiving hole 4 need not be hexagonal, but may be polygonal or oval.
The bit 11 also has a shape such as a polygon or an oval that matches the shape of the receiving hole 4. Furthermore, as the base 8,
The member is not limited to a wooden member, and may be a member made of another material as long as the member can be cut by the cutting blade 9.

[0018]

Since the present invention is constructed as described above, it is possible to sharply cut the periphery of the through hole of the base with the cutting blade in a short time in a sharp manner, and to quickly and easily form the flange portion and reduce the noise to be flush with the base. It can be embedded, yet the base is securely fastened to the foundation concrete.

In particular, the cutting blade extends from the center of the arcuate bottom surface of the flange toward the peripheral end, and maintains the height of the blade at a predetermined height from the center to the peripheral end. On the front side of the blade, from the valley of the cutting blade toward the front,
By forming a gently inclined shavings relief surface that rises up gradually so as to be continuous with the arc-shaped bottom surface, when cutting the periphery of the insertion hole of the base with this cutting blade, it sharpens up to the peripheral edge of the flange, In addition, the cutting can be reliably performed in a short time, and the cutting chips cut by the cutting blade can be quickly discharged to the outside from the relief surface.

In addition, when the main body of the nut is formed in order from rough to fine by driving a punch into a die in a pressure forming machine, cutting is performed by cutting the arc-shaped bottom surface of the flange portion of the intermediate material formed in the previous step. The blade can be formed easily and with high accuracy, and thus the edge of the cutting blade can be formed at an acute angle while the main body of the nut can be mass-produced by the forging machine.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a base tightening nut according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a bottom view of the same.

FIG. 4 is a perspective view of the same.

FIG. 5 is a sectional view showing a use state of the nut.

FIG. 6 is a bottom view showing another embodiment of the shavings relief surface.

FIG. 7 is a bottom view showing another embodiment of the cutting blade.

FIG. 8 is a bottom view showing still another embodiment of the cutting blade.

FIG. 9 is a partially cutaway front view of a conventional base tightening nut.

FIG. 10 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nut main body 2 Cylindrical part 3 Flange part 3a Arc-shaped bottom surface 4 Receiving hole 6 Anchor bolt 7 Screw part 8 Wooden base 9 Cutting blade N Base tightening nut

Claims (2)

[Claims] 1. A nut main body comprising a cylindrical portion and a flange portion connected to an upper end of the cylindrical portion, a receiving hole for locking a tool is provided at a central portion of an upper surface of the nut main body, On the inner surface of the portion, a screw portion communicating with the central portion of the receiving hole and screwing the anchor bolt is provided, while the lower surface of the flange portion is a downwardly bulging circle gradually rising from the central portion toward the peripheral end direction. A base tightening nut having an arc-shaped bottom surface, and a plurality of cutting blades for cutting a base placed on a foundation concrete are punched at equal intervals into the arc-shaped bottom surface by punching. 2. The cutting blade extends from the center of the arcuate surface of the flange toward the peripheral end, and the height of the blade is maintained at a predetermined height from the center to the peripheral end. The cutting blade has a front surface formed with a gently sloping chip release surface which is formed from the valley of the cutting blade toward the front thereof and gradually rises so as to be continuous with the arc-shaped bottom surface. Item 2. A nut for tightening a base according to Item 1.