JPS6113769Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tuft pin screw used when assembling aluminum sashes and the like, for example, when connecting and fixing the shapes that will become a solid stile and a horizontal stile.

When connecting and fixing a vertical section and a horizontal section, as shown in Fig. 1, a screw retaining groove 2 with a C-shaped cross section is formed in advance on one section 1, and then the screw retaining groove 2 with a C-shaped cross section is formed in advance on one section 1.
A tapping pin screw is inserted into the through hole 3 and is forcibly screwed into the screw retaining groove 2, thereby joining the two shapes 1 and 1' without performing tapping processing on the screw retaining groove 2. However, in aluminum sashes, as shown in FIG. 1, the tassel pin screws are often hidden in the internal space of the shank material 1' when the shapes are connected, making it difficult to smoothly insert and screw in the tatu pin screws. Therefore, as shown in Fig. 2, a tapping screw 4 having a cylindrical portion 4A without a thread at the tip is used, and the screw is screwed into the cylindrical portion 4A using the cylindrical portion 4A as a guide to facilitate the screwing operation. , there is something that can be done accurately.

However, in the case of such a tut pin screw 4, when the threaded portion 4B of the tut pin screw 4 slips out of the screw retaining groove 2 when the shape material is disassembled, even if the tut pin screw 4 is rotated, it simply rotates idly and the shape material 1' is There is a drawback that the tuft pin screw 4 cannot be extracted externally.

On the other hand, as shown in FIG.
A tuft pin screw 5 having a threaded portion 5C having a thread smaller than that of the thread is known from Japanese Utility Model Application Publication No. 48-40669. According to such a tut pin screw 5, since a small internal thread is first drilled in the threaded portion 5C, screwing can be performed with a small force, and at the same time, the tut pin screw 5 can be made to protrude to the outside of the mold material 1' during disassembly. .

However, in the case of such a tuft pin screw 5, since there is a threaded portion 5C at the tip, it is difficult to correctly guide the screwing direction, and also because the threaded portion 5B and the threaded portion 5C are not continuous, the threaded portion There may be cases where the tip of the threaded part 5B is not screwed into the female threaded part drilled by 5C,
At this time, the previously tapped female thread is not only broken as a result, resulting in poor tightening, but also has the disadvantage that the previously described return action of the screw 5 cannot be performed.

This invention was devised to eliminate these conventional drawbacks, and its purpose was to provide a tapping screw that facilitates the connection and disassembly of shapes and that can be obtained at low cost by rolling. be.

The tatsupin screw according to this invention has a main thread formed in a cylindrical portion on the proximal end side, a secondary thread continuous with the main screw and the same pitch as the main screw formed on the cylindrical portion on the distal end side, and the main screw is connected to the screw retainer. The secondary screw has a thread diameter that is larger than the inner diameter of the stop groove and a thread diameter that is smaller than the diameter of the screw holding groove, and the secondary screw has a thread diameter that is slightly smaller than the inner diameter of the thread holding groove and a valley that is larger than the thread diameter of the main screw. The screw has a diameter and is large enough to be screwed into the female thread of the screw retaining groove tapped by the main screw, and the sub-thread portion acts as a guide when screwing in, and the sub-screw acts as a guide when disassembling the screw. It is designed to be securely engaged with the female thread of the retaining groove, and also to be easily manufactured by rolling.

This invention will be explained below based on an illustrated embodiment. As shown in FIG. 4, the tuft pin screw 10 according to this invention consists of a head 11 and a cylindrical portion 12.
A main thread 13 is formed on the proximal end side of the cylindrical portion 12, and a secondary thread 14 is formed on the distal end side.

As shown in FIGS. 4 and 5, the main screw 13 is
The thread diameter d is larger than the inner diameter D of the screw retaining groove 2 of one of the vertical and horizontal shapes 1 and 1' to be connected and fixed.
1 and a root diameter d2 smaller than this inner diameter D, and is formed from the seat surface of the head 11 to a distance l1 (a length that provides an appropriate tightening and fixing force).

The secondary screw 14 is continuous with the main screw 13 and has the same pitch as the main screw 13. The thread diameter d3 of the sub-screw 14 is slightly smaller than the inner diameter D of the screw retaining groove 2;
The root diameter d4 is larger than the root diameter d2 of the main screw 13, and the thread shape is such that it can be tapped by the main screw 13 and screwed into the internal thread 15. As a result, the auxiliary screw 14 functions as a guide when the tapping screw is screwed in, and when disassembled, it screws into the female screw 15 to cause the tapping screw to fully protrude to the outside. Incidentally, the length l2 of this sub-screw 14 is set so as to be able to perform the two functions described above.

A tuft pin screw having such a configuration can be easily manufactured by making a slight modification to a normal rolling die 16 as shown in FIG. That is, the pair of dies 16A, 16B has an outer diameter D1 (=d1),
A thread groove 17 with an inner diameter D2 (=d2) is formed, and a portion of the die corresponding to the auxiliary thread 14 may be ground by φ to have an inner diameter D3 (=d4).

In a die with such a configuration, the diameter D0 (D3
<D0<D1) If the material is rolled, the thread groove 17 at the 13th part of the main thread will be filled with the desired main thread 13, and the 14th part of the main thread will have a thickness equal to the amount of grinding. A desired sub-thread 14 with a small thread diameter and a small rise is formed.

Here, the thread diameter d3 of the auxiliary screw 14 is set to be slightly smaller than the inner diameter D of the screw retaining groove, and can be adjusted by the grinding amount φ.

When connecting the vertical and horizontal sections 1 and 1' using such a tapping screw, if the tapping screw 10 is inserted into the screw retaining groove 2 of the section 1 through the through hole 3 of the section 1', the auxiliary screw 14 section is removed. is the screw retaining groove 2
It immerses itself inside and becomes a derivative. If rotation is applied with a screwdriver from this state, the tuft pin screw 10 will be correctly guided by the auxiliary screw 14, and the main screw 13 will be accurately screwed into the screw retaining groove 2 of the companion section 1.

When disassembling the shapes 1, 1', if the main screw 13 continues to rotate in the opposite direction even after it has come out of the screw retaining groove 2, the auxiliary screw 14 will continue to the female thread tapped by the main screw 13. Since they are screwed together, the tapping screw 10 continues to move back and the head 11 protrudes outside the profile 1'. Therefore, even though the tapping screw 10 has a thread guide portion after the shape is fastened, it can be easily and reliably pulled out from the shape 1' by turning the screw in the opposite direction.

Since the tuft pin screw according to this invention has the above-described structure, it is possible to perform the assembling work of the shape material and the disassembly work at the time of repair extremely easily and reliably. Furthermore, it is easy to manufacture with only slight improvements to the rolling die and is inexpensive.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing how the mold material is installed, Figure 2
3 is a front view showing a conventional tapping screw, FIG. 4 is a front view showing a tapping screw according to this invention, FIG. 5 is a cross-sectional view showing a similar tapping screw in an attached state, and FIG. It is a sectional view showing a manufacturing method of a similar tuft pin screw. 1, 1'...Shape material, 2...Screw retaining groove, 3...
Through hole, 4... Tatsupin screw, 4A... Cylindrical part,
4B...Thread part, 5...Tatsupin screw, 5A...
...Cylindrical part, 5B...Threaded part, 5C...Threaded part, 10...Tatsu pin screw, 11...Head, 12
... Cylindrical part, 13 ... Main screw, 14 ... Secondary screw,
15...Female thread, 16, 16A, 16B...Dice, 17...Thread groove.

Claims (1)

[Scope of utility model registration request] A main thread is formed in the proximal cylindrical part, and a sub-screw that is continuous with the main screw and has the same pitch as the main screw is formed in the distal cylindrical part, and the main screw has a thread diameter larger than the inner diameter of the screw retaining groove. The auxiliary screw has a root diameter slightly smaller than the inner diameter of the screw retaining groove and a root diameter slightly larger than the root diameter of the main screw. A tapping screw characterized in that the screw is large enough to be screwed into a female thread of a tapped screw retaining groove.