JP2517494B2 - 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 having a hollow shaft portion having an internal thread formed on its inner peripheral surface and a flange portion extending outward from one end of the shaft portion.
In particular, the present invention relates to a propeller T nut having a plurality of threads formed on the outer peripheral surface of a shaft portion.

[0002]

2. Description of the Prior Art FIG. 4 shows a conventional T-nut 1 of interest to the present invention. FIG. 5 is a plan view of the T-nut 1 shown in FIG.

[0003] The T nut 1 is made of an integral metal material.
The shaft portion 2 and the flange portion 3 protruding outward from the first end portion of the shaft portion 2 are provided. The shaft 2 has a hollow cylindrical shape.
A female screw 4 is formed on the inner peripheral surface of the shaft portion 2, while a plurality of screws 5 are formed on the outer peripheral surface thereof.
The screw 5 has a relatively large lead or pitch. Such a screw 5 is formed, for example, by shifting the metal material existing in the part 6 of the shaft portion 2.

Such a T-nut 1 is attached to a fixed object made of a soft metal material such as wood or aluminum as follows. That is, a hole is previously formed in the object to be fixed, and the shaft portion 2 is driven into the hole. As a result, the screw 5 bites into the inner peripheral surface of the hole, and the T-nut 1 is fixed to the object to be fixed. As described above, when the T-nut 1 is fixed to the object to be fixed, the screw 5 bites into the inner peripheral surface of the hole, so that the shaft portion 2 is prevented from coming off the hole, and the T-nut is also prevented. It is prohibited that 1 rotates with respect to the fixed object. Therefore, a screw member such as a bolt can be screwed into the female screw 4 formed on the inner peripheral surface of the shaft portion 2. T-nuts 1 of this type are now often used for fixing to the lower ends of chair legs and for attaching casters thereto by screws.

[0005]

However, in order to fix such a T-nut 1 to an object to be fixed in an appropriate state, the T-nut 1 is set between the size of the envelope surface given by the screw 5 and the size of the hole. Relatively high accuracy is required. For example, if the size of the envelope surface provided by the screw 5 is smaller than the ideal size, the T-nut 1 may rotate when the corresponding screw member is screwed into the T-nut 1. Further, due to such rotation, the shaft portion 2 may be further displaced in the axial direction with respect to the hole, or in the worst case, the shaft portion 2 may slip out of the hole.

Therefore, it is an object of the present invention to provide a T-nut that is particularly adapted to reliably inhibit rotation.

[0007]

SUMMARY OF THE INVENTION A T-nut according to the present invention is made of an integral metal material, and extends outward from a shaft portion and a first end of the shaft portion, and at a right angle to a central axis of the shaft portion. The shaft portion has a hollow cylindrical shape, and the female screw is formed on the inner peripheral surface of the shaft portion, and the plurality of screws are formed on the outer peripheral surface of the shaft portion. In the department,
The two protrusions formed by crushing a part of the outer peripheral edge of the flange portion from the outside to the inside face the shaft at a position facing each other at an angle of 180 ° around the central axis of the shaft. It is characterized in that it is provided so as to project toward the second end of the portion, and that all the portions of the flange portion other than the portion provided with the two protrusions are formed flat.

[0008]

In the present invention, 2 provided on the flange portion
The individual protrusions are formed by crushing a part of the outer peripheral edge of the flange portion from the outer side to the inner side only at two locations facing each other at an angle of 180 ° around the central axis of the shaft portion, In addition, since the portions other than the portions where the protrusions are formed are formed flat, the flat portion where the protrusions are not formed is engaged with the corresponding groove of the guide of the supply track having a pair of opposed U-shaped grooves in cross section. Since a plurality of sheets can be combined and continuously conveyed, automatic supply can be easily performed. In this case, since the pair of protrusions arranged so as to face each other are located between the guide grooves that face each other, the protrusions of the T nuts that are adjacently supplied come into contact with each other, and the adjacent T
The inconvenient phenomenon of one of the nuts riding on the other and overlapping is also avoided. Also, these protrusions
Despite being relatively short, the T-nut has a sufficient fixing force to prevent rotation of the T-nut against the object to be fixed, as well as the effect of the screw biting, and the screw is mounted on the outer peripheral surface of the shaft part. The function required for the protrusion in the provided T-nut is not impaired. Further, since the portion of the flange portion other than the portion provided with the projection is flat, the flat surface of the flange portion abuts the surface of the fixing target into which the T-nut is driven. As a result, the flange portion does not lift from the surface of the object to be fixed in the state of being driven into the object to be fixed, and the entire shaft portion can be reliably embedded in the object to be fixed.

[0009]

As described above, according to the present invention, the rotation of the T-nut with respect to the object to be fixed is prohibited because both the screw and the projection bite into the object to be fixed. Is increased. Therefore, it is possible to advantageously prevent the shaft portion from being axially displaced with respect to the hole due to such rotation, and further, the shaft portion from coming out of the hole. As a result, T
The nut can be securely fixed to the object to be fixed.

Further, since the projection is formed by crushing a part of the outer peripheral edge of the flange portion from the outside to the inside, when forming such a claw,
Since, for example, only a press is applied, the protrusions are formed, so that the processing cost is not increased so much.

[0011]

1 is a front view showing a T-nut 11 according to an embodiment of the present invention. FIG. 2 is a plan view of the T-nut 11 shown in FIG. FIG. 3 is a line III-II in FIG.
It is sectional drawing which follows I.

The T-nut 11 is integrally obtained, for example, by processing an iron-based metal plate into a metal plate.
2 and a flange portion 13 protruding outward from the first end portion of the shaft portion 12.

The shaft portion 12 has a hollow cylindrical shape. Shaft 12
A female screw 14 is formed on the inner peripheral surface of the
A plurality of screws 15 are formed on the outer peripheral surface of 2. Like the screw 5 of the conventional T-nut 1, the screw 15 is also formed by shifting the metal material forming the part 16 of the shaft portion 12. Screw 15 has a relatively large lead or pitch. Further, as can be seen by comparing FIG. 1 and FIG. 3, the screw 15 and the female screw 14 give a spiral that advances in mutually opposite directions.

The flange portion 13 is provided with a plurality of, for example, two projections 17 formed by crushing a part of the outer peripheral edge of the flange portion 13 from the outside to the inside with an angular interval of 180 degrees. , Is provided so as to project toward the second end opposite to the first end of the shaft portion 12. As a result of the projection 17 being formed on the outer peripheral edge of the flange portion 13, a notch 18 having a substantially semicircular cross section is left.

Such a T-nut 11 is used in the same manner as the conventional T-nut 1. That is, the shaft portion 12 is driven into a hole provided in advance in the object to be fixed. As a result, the screw 15 bites into the inner peripheral surface of the hole,
The protrusions 17 bite into the surface of the adhered object. In such a mounted state of the T-nut 11, not only the screw 15 but also the protrusion 17 is prohibited from rotating with respect to the object to be fixed. Further, the shaft portion 12 is prevented from coming out of the hole, mainly by the screw 15 biting into the inner peripheral surface of the hole, but the undesired rotation of the T-nut 11 causes wear of the material and the shaft portion. 12 tends to come out of the hole more easily. However, as mentioned above, the T-nut 1
Since No. 1 is surely prohibited from rotating with respect to the object to be fixed, such prohibition of rotation also acts to prevent the shaft portion 12 from coming out of the hole. Therefore,
The T-nut 11 can be firmly fixed to the object to be fixed.

[Brief description of drawings]

FIG. 1 is a front view showing a T-nut 11 according to an embodiment of the present invention.

FIG. 2 is a plan view of a T-nut 11 shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a front view showing a conventional T-nut 1 which is of interest to the present invention.

5 is a plan view of the T-nut 1 shown in FIG. 4. FIG.

[Explanation of symbols]

 11 T Nut 12 Shaft 13 Flange 14 Female Thread 15 Screw 17 Protrusion

Claims (1)

(57) [Claims] 1. A shaft portion and a flange portion made of an integral metal material and extending outward from a first end portion of the shaft portion and in a direction substantially perpendicular to a central axis of the shaft portion, The shaft portion has a hollow cylindrical shape, an internal thread is formed on the inner peripheral surface of the shaft portion, and a plurality of threads are formed on the outer peripheral surface of the shaft portion, and the flange portion includes the flange portion. 2 was formed by crushing a part of the outer peripheral edge from the outside to the inside
Projections are provided at positions facing each other around the central axis of the shaft portion at an angle of 180 ° so as to project toward the second end portion of the shaft portion, and the two projections are provided. A T-nut in which all the portions of the flange portion other than the portion provided with are formed flat.