JP2002168223A - Nut with washer and bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut with washer and a bolt that lowers the increase of resistance according as a spot facing acts, and sinks the washer part fast. SOLUTION: The nut with washer 1 and the bolt is provided with a cutting edge 6, making a bearing surface, at its washer part 2. The cutting edge 6 is provided with an undersurface cutting edge 7 and a circumference cutting edge 8. The undersurface edge 7 is radiately set at the under surface of the washer part 2. The circumference edge 8, connecting to the undersurface edge 7, is formed at the circumference of the washer part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a nut with a washer and a bolt used for fixing wood.

[0002]

2. Description of the Related Art In a wooden framed house or a wooden wall structure house, many nuts and bolts with washers are used for fixing wood such as a base, a pillar or a beam. And recently, in order to avoid the part of the nuts and bolts used from sticking out of the surface of the wood and getting in the way, and to eliminate the need to pre-form the digging to bury the overhang, Nuts and bolts with washers having undercut blades on the lower surface have been proposed.

A nut or bolt with a washer provided with a digging blade comprises a washer, a nut or a bolt, and a lower surface of the washer is provided with a digging blade extending radially from the center to the periphery. is there. And, for example, when an anchor bolt is penetrated into a through hole provided in a base, and a nut with a washer is screwed into this to fix the base to the foundation, a washer with a digging blade is used, and a washer is used. As the attached nut is rotated with a tool, digging is performed at the same time as screwing,
There is an advantage that a preliminary digging operation is not required, and that there is no obstructive overhang on the wood surface.

At this time, if the washer is formed in a flat disk shape, the amount of digging is reduced and the working time is reduced. However, on the other hand, the washer needs to endure a strong fastening force, and its thickness is as large as about 4 to 5 mm, and the disc-shaped washer has a peripheral surface. In addition, conventional digging blades,
Only the lower surface of the washer is provided. For this reason, the initial cutting state at the surface of the wood is good, but the cutting efficiency will be deteriorated due to the so-called clogging of the chips, and the peripheral surface of the washer without cutting edges will have the resistance of sinking. As a result, the digging speed is extremely reduced. In some cases, the perimeter of the formed dug-out is rough, giving the impression that the work is rough.

Eventually, the resistance at the time of compressing the chips on the lower surface of the washer reaches the limit, and the digging stops. Since nuts and bolts with washers with digging blades are rotated using a rotary tool, stop the progress of digging, that is, increase the rotational resistance to the torque limit of the rotary tool,
Although it can be used for automatic stop of a rotary tool, on the other hand, the sinking speed of a target washer is slow due to a large resistance, which causes a delay in working time. Also, there are times when the entire thickness of the washer and hard wood cannot be submerged.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nut with a washer and a bolt, which have a small increase in resistance due to the progress of digging, and which quickly sink in a washer portion.

[0007]

Means for Solving the Problems In a nut with a washer comprising a disk-shaped washer portion and a nut portion extending downward from a central portion of the lower surface thereof, a digging blade provided on the lower surface of the washer is formed around the lower blade and the periphery. And a face blade. The lower blade is formed radially from the lower central portion of the washer to the periphery of the washer, and the peripheral blade is formed on the peripheral surface of the washer by connecting to the lower blade. The disk-shaped washer is usually a thin cylinder cut out, and the peripheral surface is a vertical surface perpendicular to the upper and lower surfaces. However, there may be a rounded peripheral surface. A tool hook is provided on the upper surface of the washer. 180 ° or 1
There are two or three, and in some cases, more through holes or depressions (holes) arranged at intervals of 20 °. Alternatively, the tool holder may be an inner six stroke or inner square hole formed at the center of the upper surface. The rotary tool is provided with a bit corresponding to the form of the tool holder. The digging blades are also located at 180 ° and 120 ° intervals on the underside of the washer,
Form three.

The peripheral blade is a vertical blade that appears on the peripheral surface of the washer portion, and the lower surface blade is formed on the peripheral surface where the peripheral edge of the washer portion is reached. When the peripheral blade portion is viewed from the front, a space is formed in a triangular pyramid shape by the inclined surface in the rotation direction front of the blade. In other words, the peripheral blade is configured such that a part of the peripheral surface of the lower surface of the washer portion, which is the front side in the rotation direction of the lower surface blade, extends in the thickness direction of the washer portion from the lower surface center side to the peripheral direction along the lower surface blade. The side is a standing wall, and the point where the lower blade reaches the peripheral edge is formed by the inclined surface that becomes the deepest.

[0009] The screw hole of the nut portion may be formed through the washer portion. In this configuration, the nut with washer can be used by penetrating the screw portion of the bolt. The bolt with washer is a bolt with the nut part of the nut with washer formed as a bolt. The configuration of the lower surface blade formed on the lower surface and the peripheral surface of the washer and the peripheral blade connected thereto is the same as that of the nut with washer. It is.

[0010]

1 to 5 relate to a nut with a washer. The nut 1 with a washer includes a disk-shaped washer 2 and a nut 3 extending downward from a central portion of the lower surface thereof. The washer 2 and the nut 3 are formed integrally, and in this embodiment, the screw hole 4 of the nut 3 penetrates the washer 2 (FIG. 4). The washer portion 2 is basically flat on the upper and lower surfaces, like a form obtained by cutting a thin cylinder, and in this embodiment, the peripheral surface is vertical. Then, a tool holder 5 composed of two holes is formed on the upper surface, and a digging blade 6 is formed on the lower surface and the peripheral surface. The digging blade 6 comprises a lower surface blade 7 extending radially from the central portion of the lower surface of the washer 2 to the periphery of the washer 2 and a peripheral blade 8 connected to the lower surface blade 7 and formed on the peripheral surface of the washer 2 (FIG. 3). In the embodiment, there are two digging blades 6, and the lower surface blades 7 are arranged at intervals of 180 °.

The lower blade 7 is formed by using a machine tool such as a homer to form a part 9 of the lower surface of the washer portion on an inclined surface, and make the front edge in the rotation direction a standing wall 10. The peripheral blade 8 is a vertical blade that appears on the peripheral surface of the washer portion 2 (FIG. 2), and the lower surface of the washer portion is located at a location P (FIG. 5) where the lower surface blade 7 reaches the peripheral edge of the washer portion in the rotation direction. A part of the peripheral side of the bottom surface is formed along the lower surface blade 7 in the thickness direction of the washer part 2 from the lower surface center side to the peripheral direction, and the lower surface blade side is a standing wall 11 and the reaching point P is the deepest. Formed by Therefore, when the peripheral blade 8 is viewed from the front, a triangular pyramid-shaped space 13 is formed on the front side in the rotation direction of the peripheral blade 8.

FIG. 6 shows a base 14 using a nut 1 with a washer.
Is fixed to the base 15, the upper end of the anchor bolt 16 fixed to the base 15 is passed through a through hole provided in the base 14, and the base 14 is placed on the top end of the base 15.
The nut 1 with a washer is screwed into the upper end of the anchor bolt 16 from the upper surface side. A screw 17 is used for screwing. As the screwing with the anchor bolt 16 progresses, the nut with washer 1 is drawn to the base 14, and the lower surface of the washer portion 2 comes into contact with the surface of the base 2 before digging starts. At the beginning of digging, chips scraped by the lower blade 7 are sent to the peripheral side of the washer 2 by centrifugal force or the like and discharged. Even when the peripheral surface of the washer 2 reaches the upper surface of the base 2, the peripheral blade 8 exerts a cutting function, and chips by the lower blade 7 are discharged to the outside through a triangular pyramid-shaped space. Because it is easy, the rotation resistance of the washer 2 is small. For this reason, the sink nut 1 sinks quickly.

FIG. 7 shows an example of a bolt 18 with a washer.
It comprises a washer 19 and a bolt 20. The form of the washer 19 is the same as that of the nut 1 with the washer, and has a plurality of tool hooks 5 on the upper surface side and a plurality of digging blades 6 including the lower surface blade 7 and the peripheral surface blade 8 on the lower surface. . The tool holder 5 is an inner hexagonal hole provided at the center of the washer, but may be an inner square hole, or a plurality of through holes or recesses arranged at intervals along a circle. Others are not particularly different from the nuts with washers.

[0014]

According to the present invention, since the peripheral surface blade is provided in the washer portion, resistance to sinking of the peripheral surface of the washer portion is small, and sinking of the washer portion due to digging is quick. Further, since the peripheral edge of the counterbore is cut by the peripheral surface blade, it is possible to prevent the occurrence of splinters on the peripheral edge of the counterbore hole to be formed. Since there is a triangular pyramid-shaped space ahead in the rotation direction of the peripheral blade, chips are discharged to the final stage through this space during digging, and the degree of chip compression on the lower surface of the washer is low. For this reason, sinking of the washer portion due to digging is quick.

[Brief description of the drawings]

FIG. 1 is a perspective view of a nut with a washer viewed from a nut portion side.

FIG. 2 is an enlarged perspective view showing a portion B in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 5;

FIG. 4 is a perspective view of a nut with a washer viewed from a washer portion side.

FIG. 5 is a plan view of the washer seen from the lower surface side.

FIG. 6 is a perspective view showing a use state.

7 (a) and 7 (b) are perspective views of bolts with washers shown in different directions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nut with washer 2 Washer part 3 Nut part 4 Screw hole 5 Tool hook part 6 Drilling blade 7 Lower surface blade 8 Peripheral surface blade 9 Part of lower surface 10 Standing wall (lower surface blade) 11 Standing wall (peripheral blade) 12 Inclined surface 13 Triangular pyramid space 14 Base 15 Foundation 16 Anchor bolt 17 Rotary tool 18 Washer bolt 19 Washer part 20 Bolt part

Claims (3)

[Claims] 1. A disk-shaped washer portion, and a nut portion extending downward from a central portion of a lower surface thereof, wherein the washer portion has a tool hooking portion on an upper surface and a digging blade on a lower surface. The blade consists of a lower surface blade extending radially from the lower central portion of the washer to the periphery of the washer and a peripheral blade formed on the peripheral surface of the washer connected to the lower surface blade. A part of the peripheral side of the lower surface of the washer part, which is the rotation direction front side of the reached point,
The washer is characterized in that the washer is formed from a lower surface center side to a peripheral direction along the lower surface blade in the thickness direction of the washer portion and the lower surface blade side is an upright wall, and is formed by an inclined surface at which the reaching point is deepest. nut. 2. The nut with a washer according to claim 1, wherein a screw hole of the bolt is formed through the washer. 3. A disk-shaped washer, and a bolt extending downward from a central portion of the lower surface thereof, the washer having a tool hooking portion on an upper surface and a digging blade on a lower surface. The blade consists of a lower surface blade extending radially from the lower central portion of the washer to the periphery of the washer and a peripheral blade formed on the peripheral surface of the washer connected to the lower surface blade. A part of the peripheral side of the lower surface of the washer part, which is the rotation direction front side of the reached point,
The washer is characterized in that the washer is formed from a lower surface center side to a peripheral direction along the lower surface blade in the thickness direction of the washer portion and the lower surface blade side is an upright wall, and is formed by an inclined surface at which the reaching point is deepest. bolt.