JP3026150B2 - T nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T-nut used for fixing various members, and more particularly to a T-nut having a hollow cylindrical shaft and a flange provided at one end of the shaft. The present invention relates to a structure of the flange portion in a T-nut integrally formed of a metal material.

[0002]

2. Description of the Related Art Conventionally used T-nuts include:
For example, as shown in FIG. 3, a shaft portion 1 having a hollow cylindrical shape,
A flange 2 provided at one end of the shaft 1 and a pair of protrusions 3 formed around the periphery of the flange 2.
0 (Japanese Patent Laid-Open No. 5-1261).
No. 26). On the inner peripheral surface of the shaft portion 1, a female screw 11 is provided on the flange portion 2 side, and a screw member such as a bolt can be screwed. Further, the protrusion 3
0 is formed by crushing a part of the outer peripheral edge of the flange portion 2 from the outside to the inside.

As shown in FIG. 4, a T-nut having the above structure first forms a hole 41 in a fixing object 40 with respect to a fixing object 40 made of wood or a soft metal material. While the shaft portion 1 of the T-nut is inserted and penetrated, the back surface of the flange portion 2 is pressed against the fixation target 40 side, and the protrusion 30 of the flange portion 2 bites into the fixation target 40, thereby fixing both. Thereafter, the shank 1 protruding from the fixing object 40 is caulked to integrate the fixing object 40 and the T-nut (the state shown in FIG. 4), and the screw member is screwed to the shank 1 of the T-nut. By doing so, the other member and the object to be fixed are fixed.

[0004]

However, according to the T-nut having the above structure, after the shaft portion 1 and the flange portion 2 are integrally formed by pressing a metal material,
Since the projections 30 are provided by press working in which a part of the outer peripheral edge of the flange portion 2 is crushed from the outside to the inside, the press working is required twice, which makes the processing complicated and increases the processing cost. Was.

As shown in FIG. 5, a plurality of conical projections 31 are formed on the flange 2 at the same time as the pressing at the time of manufacturing the T-nut. It has been difficult to reliably fix the T-nut to the object to be fixed due to the shape of the projection 31.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a T-nut which can be easily processed and reduced in cost, and can be securely fixed to an object to be fixed.

[0007]

According to a first aspect of the present invention, a hollow cylindrical shaft portion and a flange portion provided at one end of the shaft portion are integrally formed of a metal material. It is a T-nut formed in an intended manner, and includes the following configuration. An internal thread is provided on the flange side of the inner peripheral surface of the shaft portion. A plurality of substantially triangular pyramid-shaped protrusions that are convex toward the shaft by press working are provided on the flange. Arrange one surface of the triangular pyramid of the protrusion along a surface including the radius of the flange portion,
This is referred to as a rotation prevention surface. And a hole is provided in this rotation prevention surface.

According to a second aspect of the present invention, in the T-nut according to the first aspect, the rotation preventing surface is perpendicular to the surface of the flange portion.

According to a third aspect of the present invention, in the T-nut according to the first aspect, a plurality of projections are provided in pairs so as to be point-symmetric with respect to the center of the shaft. It is characterized in that the bottom sides of the anti-rotation surface are located on the same extension line.

According to a fourth aspect, in the T-nut according to the third aspect, two pairs of protrusions are provided, and two extended lines including the bottom sides of the rotation preventing surfaces of the pair of protrusions are orthogonal to each other. On the other hand, it is characterized in that the anti-rotation surfaces are arranged in a direction facing each other with a shift of 90 degrees.

[0011]

According to the first aspect, when the shaft portion of the T-nut is driven into the hole of the object to be fixed, the protrusion provided on the flange portion cuts into the surface of the object to be fixed. At this time, since the shape of the projection is substantially triangular pyramid, the fixing with the object to be fixed is strengthened, and the anti-rotation surface is arranged along the surface including the radius of the flange portion. Since the hole is formed, when the T-nut is rotated with respect to the object to be fixed, the object to be fixed bites into the hole to secure the fixing.

According to the second aspect, since the rotation preventing surface is perpendicular to the flange surface, when the T nut is rotated with respect to the fixing object, the fixing object does not bite into the hole. Be more robust.

According to the third aspect, since the bottom sides of the rotation preventing surfaces of the pair of protrusions are located on the same extension line, the rotation of the T-nut with respect to the fixing object when the T-nut is rotated with respect to the fixing object. The penetration into the hole is further strengthened.

According to the fourth aspect, since two pairs of projections are provided and the rotation preventing surfaces are present in a direction facing each other with a 90 ° deviation, the T nut and the T nut can be rotated in either direction in the rotation direction given to the T nut. Ensure the fixation to the fixation object.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a T-nut according to the present invention will be described.
This will be described with reference to the drawings. 1A is a side view of the T-nut, FIG. 1B is a cross-sectional view, FIG. 2A is a plan view, and FIG. 2B is a rear view. The T-nut has a hollow cylindrical shaft portion 1 and a flange portion 2 provided at one end of the shaft portion 1 and is integrally formed by pressing a metal material. On the inner peripheral surface of the shaft portion 1, a female screw 11 is provided on the flange side thereof by thread cutting.
A caulking portion 12 having no female screw is provided on the side opposite to the flange.

The characteristic configuration of the present invention is that the projection 3 is formed simultaneously by press working when manufacturing a T-nut.
Is provided on the flange portion 2. The four projections 3 are provided on the flange 2 so as to project toward the shaft 1. Each projection 3 is formed by pressing a triangular pyramid-shaped pressing die (not shown) against the back surface of the flange 2 at the time of press working, so that the upper surface (projection surface) side is slightly rounded. It has a substantially triangular pyramid shape.

Each projection 3 has one surface of the triangular pyramid as an anti-rotation surface 4, and this anti-rotation surface 4 is arranged along a surface including the radius of the flange portion 2. It is perpendicular to the surface of the flange 2. Each protrusion 3
Is provided with a triangular hole 5. The holes 5 are formed simultaneously by press-working the flange 2 and providing the projections 3 by increasing the height of the projections 3 to some extent. Therefore, no special processing for forming the hole 5 is performed.

The projections 3 are arranged so as to form a pair with the center of the shaft 1, and the bottom sides of the rotation preventing surfaces 4 of the paired projections 3 are positioned on the same extension lines 6, 6 '. The extension lines are orthogonal to each other, and the rotation preventing surfaces 4 of the projections 3 are provided at every 90 degrees. Further, since the rotation preventing surfaces 4 of the two pairs of projections 3 are arranged on opposite sides, the rotation preventing surfaces 4 of the respective projections 3 are arranged so as to face each other with a shift of 90 degrees.

Next, a method of using the T nut having the above structure will be described. The shaft 1 is inserted into a hole provided in the fixing object in advance.
Is inserted into the object to be fixed so as to penetrate through. At this time, the projection 3 provided on the flange 2 bites into the surface of the object to be fixed, but since the shape of the projection 3 is substantially triangular pyramid, it is easy to bite into the object to be fixed, and both are firmly fixed. Further, an anti-rotation surface 4 is arranged along a surface including the radius of the flange portion 2, and a hole 5
Is formed, when the T-nut is rotated with respect to the object to be fixed, the object to be fixed bites into the hole 5 to securely fix the object to be fixed and the T-nut. It is prohibited to rotate with respect to the object. Thereafter, as described in the conventional example, the shaft 1 projecting from the object to be fixed is caulked to integrate the object to be fixed and the T nut, and the screw member is screwed to the shaft 1 of the T nut. By doing so, the other member and the object to be fixed are fixed. Therefore, according to the above structure, the rotation of the T nut when the screw member is screwed onto the shaft portion 1 of the T nut causes the shaft portion 1 to be detached from the hole of the object to be fixed or the shaft portion 1 to be displaced. Can be prevented.

When the T-nut is rotated with respect to the object to be fixed, the rotation preventing surface 4 is perpendicular to the flange surface 2, so that the object to be fixed is more likely to bite into the hole 5. However, it is possible to further firmly fix the two.

Further, since the bottom sides of the rotation preventing surfaces 4 of the pair of projections 3 are located on the same extension line, when the T nut is rotated with respect to the fixing object, the hole portion of the fixing object is rotated. It is possible to make the bite 5 more firm. Furthermore, since the rotation preventing surfaces 4 are arranged so as to face each other with a shift of 90 degrees, it is possible to reliably fix the T nut and the fixing object to either side in the rotation direction given to the T nut.

Further, according to the T-nut having the above-described structure, the projection 3 formed simultaneously with the pressing at the time of manufacturing the T-nut is provided on the flange 2, so that a special pressing process is performed when the projection is formed. All of them can be formed by one press working and thread cutting without performing the above, and the processing cost can be reduced.

[0023]

According to the present invention, since the projection is formed by press working when manufacturing the T-nut, the processing is simple and the cost is reduced. Since the rotation preventing surface is provided along the surface including the radius and the hole is provided in the rotation preventing surface, the T nut can be securely fixed to the fixing object.

[Brief description of the drawings]

FIG. 1 shows a T-nut according to an embodiment of the present invention.
(A) is a side view, (b) is a sectional view.

FIG. 2 shows a T-nut according to an embodiment of the present invention.
(A) is a plan view and (b) is a back view.

3A and 3B show a conventional T-nut, in which FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view.

FIG. 4 is an explanatory cross-sectional view when a T-nut is fixed to an object to be fixed and caulking is performed.

FIG. 5 is a perspective view showing a conventional T-nut.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shaft part, 2 ... Flange part, 3 ... Projection part, 4 ... Anti-rotation surface, 5 ... Hole part, 6, 6 '... Extension line, 11 ...
Female screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16B 37/04 F16B 37/02

Claims (4)

(57) [Claims] 1. A T-nut in which a hollow cylindrical shaft portion and a flange portion provided at one end of the shaft portion are integrally formed of a metal material, wherein an inner periphery of the shaft portion is provided. A female screw is provided on the flange side of the surface, a plurality of substantially triangular pyramid-shaped protrusions that are convex on the shaft side by press working are provided on the flange portion, and one surface of the triangular pyramid of the protrusion is A T-nut, which is disposed along a surface including a radius to form a rotation preventing surface, and a hole is provided in the rotation preventing surface. 2. The T-nut according to claim 1, wherein the rotation preventing surface is perpendicular to a surface of the flange portion. 3. A plurality of projections are provided in pairs so as to be point-symmetric with respect to the center of the shaft, and the bottom sides of the rotation preventing surfaces of the projections forming a pair are located on the same extension line. The T-nut of claim 1. 4. Two pairs of projections are provided, and two extension lines including the bottom sides of the rotation preventing surfaces of the pair of projections are orthogonal to each other, while the rotation preventing surfaces are shifted by 90 degrees. 4. The T-nut according to claim 3, wherein the T-nut is arranged in a facing direction.