JPS6037451Y2 - blind nut - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a blind nut.

By the way, when trying to bolt other items to a board that is impossible or difficult to tap with screws, a blind nut is used for the purpose of providing a female threaded hole in the board.

However, in conventional blind nuts, a flange is formed at one end to prevent the nut from rotating when fastened to the board, so when the nut is fastened to the board, the flange is attached to the surface of the board. will be exposed.

Therefore, when attempting to bolt other parts to the substrate surface, there is a drawback that the article is obstructed by the flange and cannot be brought into direct contact with the substrate surface.

Furthermore, in an attempt to overcome this drawback, when a blind nut is passed through and fastened between the above-mentioned articles in direct contact with the substrate surface, the flange is exposed to the surface of the article. , there is an inconvenience that the article cannot be removed.

Furthermore, when using such a conventional blind nut, it is necessary to prevent the nut from rotating as a whole when tightening, regardless of the above-mentioned usage patterns. Therefore, a special tool is required to hold the flange so that it does not rotate.
Generally speaking, it has the disadvantage of being troublesome to fasten.

In order to deal with the above-mentioned conventional problems regarding blind nuts, the present invention allows the article to be attached to a substrate by bringing the article into direct contact with the surface of the substrate, and yet allows for free removal. It is an object of the present invention to provide a blind nut that can be easily fastened to its own substrate.

Hereinafter, an embodiment shown in the drawings will be described in detail.

In the figure, 1 is a sleeve-shaped nut member with a straight cylindrical outer circumference and a female thread 2 formed on the inner circumference of the tip, and 3 is a bolt with a polygonal outer circumference (hexagonal in the illustrated example). This is a washer member in which the inner diameter of the hole 4 is made equal to that of the nut member 1.

The nut member 1 and the washer member 3 are the first,
In the first embodiment shown in Fig. 2, they are continuously integrated, and in the second embodiment shown in Figs. 3 and 4, and the third embodiment shown in Figs. Parts 1 and 3
is a connecting means that enables separation in the axial direction, and is combined so as to be connected at least in the circumferential direction.

That is, in the first embodiment, this connecting means is a thin wall portion 6 formed by providing a groove 5 on the outer periphery near the boundary between the nut member 1 and the washer member 3 which are in a continuous and integrated state. In both the second and third embodiments, the mating surfaces 7 and 8 are uneven engaging surfaces 7 and 8 formed at the joint portions of the separated members 1 and 3, respectively.

Reference numeral 9 denotes a bolt used together with this blind nut, which is inserted into the nut member 1 from the bolt hole 4 of the washer member 3 and screwed into the female thread 2.

However, on the upper surface of the washer member 3 in the first embodiment, there is a peripheral wall 1 that can surround the outer periphery of the head of the bolt 9.
0 is provided and the upper edge 11 of the wall is bent inwardly to embrace the bolt head.

Therefore, the bolt 9 used in this embodiment has a circular head with a polygonal hole.

Further, the washer member 3 of the second embodiment is in the form of a flat plate, so the bolt 9 used in conjunction with this embodiment may have a normal polygonal head.

Furthermore, the washer member 3 of the third embodiment is also provided with a peripheral wall 12 on the upper surface, and therefore, the bolt 9 used in conjunction with this embodiment is prepared with a circular head with a polygonal hole. .

Although this peripheral wall 12 does not hold the head of the bolt 9 as in the first embodiment, a torque shear groove is formed below the outer peripheral surface.
3 is formed, and the thickness of the peripheral wall is thinner only in this portion.

In FIG. 7, 14 is a board for fastening the blind nut, 15 is an article to be attached to the board, and 16 and 17 are blind nut insertion holes drilled in advance.

The blind nut of each embodiment configured as described above is
The bolt 9 is inserted into the washer member 3 and the nut member 1 and screwed onto the female thread 2, and then supplied for each purpose.

Therefore, in the first embodiment, the nut member 1 and the washer member 3 are continuously integrated at the thin wall portion 9 from the beginning, but in the second embodiment. In each of the third embodiments, the mating surfaces 7 and 8 are held together in the circumferential direction by bolts 9.

Therefore, the article 15 to be attached to the board 14 is brought into direct contact with a predetermined location on the surface of the board, and while keeping the insertion holes 16 and 17 of both of them aligned, the nut member of the blind nut is 1 into both holes 16 and 17 from the article 15 side, and bring the washer member 3 into direct contact with the surface of the article. While engaging the tool to prevent the member from rotating, strong tightening applies torque to the bolt 9.

Then, the nut member 1 has a thin wall portion 6 or a mating surface 7,
Since the washer member 3 is connected to the washer member 3 at 8 and cannot rotate with the bolt 9, the female threaded portion of the bolt 9 is connected to the washer member 3 by the bolt 9 screwed into the female thread 2.
The substrate 14 is buckled on the back surface of the substrate 14 and deformed to expand its outer diameter, and is also slightly enlarged and deformed within the insertion hole 16 of the substrate, coming into pressure contact with the inner peripheral surface of the hole. .

Therefore, for example, when the blind nut of the first embodiment is used, the nut is fastened to the base plate 14 and the article 15 is fixed to the base plate in the manner shown in FIG.

Note that the strength of the torque applied to the bolt 9 to fasten the blind nut as described above can be regulated by using a torque wrench to tighten the bolt, but further according to the third embodiment, When torque is applied with a tool such as a spanner to a portion of the peripheral wall 12 of the washer member 3 above the torque shear groove 13, the peripheral wall 12
The quality of the fastened state can be confirmed by whether or not it is sheared from 3.

On the other hand, the article 15 fixed to the substrate 14 in this manner is removed from the substrate in the following manner.

That is, in the first embodiment in which the nut member 1 and the washer member 3 are continuously integrated, when an attempt is made to remove the bolt 9, the head of the bolt is A load is applied to the washer member 3 in the direction of separating it from the nut member 1, and tensile stress concentrates on the thin wall portion 6 between both members 1 and 3, causing this portion to break. It is separated from the nut member 1 in parallel with the extraction of the nut member 1.

Further, in both the second and third embodiments, the nut member 1 and the washer member 3 are only connected in the circumferential direction at the engaging surfaces 7 and 8, so by removing the bolt 9, the washer member 3 can also be alienated.

Therefore, the article 15 can be removed from the substrate 14 with the nut member 1 remaining thereon, and the remaining nut member 1 can be used for reattachment of the article 15.

As described above, the blind nut according to the present invention is configured such that the nut member and the washer member are coupled at least in the circumferential direction and can be separated in the axial direction. When using a nut, even when trying to bolt another item to a plate material that is impossible or difficult to tap, the item can be fixed in direct contact with the plate material, Moreover, the blind nut can be removed from the plate material freely, and since the outer periphery of the washer member is polygonal, it is possible to use a wrench or the like to prevent rotation when fastening the blind nut to the plate material. This has the advantage that the fastening work can be easily performed.

[Brief explanation of drawings]

Fig. 1 is a cutaway front view showing the first embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cutaway front view showing the second embodiment. , Figure 4 is its plan view, Figure 5
The figure is a cutaway front view of the third embodiment, FIG. 6 is a sectional view taken along the line B--B in FIG. 5, and FIG. 7 is a cutaway front view showing the first embodiment in use. 1... Nut member, 2... Female thread, 3
...Washer 1 part, 6... Thin wall part,
7, 8...Matching surface.

Claims (3)

[Scope of utility model registration request] (1) Consists of a nut member whose outer circumferential shape is a straight cylindrical surface and a washer member whose outer circumferential shape is a polygon and whose inner diameter is equal to that of the nut member, and both of these members prevent separation in the axial direction. 1. A blind nut, characterized in that the blind nut is combined so as to be coupled at least in the circumferential direction by means of coupling means that enable the coupling. (2) A utility model registration claim characterized in that the connecting means between the nut member and the washer member is a thin wall portion formed near the boundary between the two members in a continuous and integrated state. A blind nut according to scope 1. (3) Utility model registration claim No. 1, characterized in that the connecting means between the nut member and the washer member is a mating surface formed at the joint portion of the two separated members. The blind nut according to item 1.