JPH04124317U - screw nail - Google Patents

Abstract

(57) [Summary] [Purpose] To firmly fix wood in close contact with ALC. [Structure] A first screw 26 on the front end side and a second screw 27 on the rear end side are attached to the outer circumferential surface of the shaft part 22 having a pointed end 23 at the front end and a head 24 at the rear end, and a non-threaded part 25 is inserted between them. are provided separately with the intervening. The positional relationship between the first screw 26 and the second screw 27 is set so that the second screw 27 is shifted from the extension line of the helical wire of the first screw 26. When the tip of the second screw 27 presses the wood and makes the head 24 sink into the wood, the part where the second screw 27 screws into the wood pulls in the head 24, so the ALC A large load is not placed on the first screw 26 screwed inside, and the occurrence of idle rotation due to destruction of the ALC is prevented.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is suitable for screw nails used to fix wood etc. to soft materials such as ALC. related.

0002

[Conventional technology]

Methods for fixing wood to ALC include installation using plugs and anchors. , installation by driving nails, installation by adhesive, and installation by screw nails. .

0003 By the way, installation using plugs and anchors requires drilling pilot holes in the ALC and wood. After the plug and anchor are expanded, drilling a pilot hole is time-consuming and construction cost is high. The problem is that it is expensive.

0004 When attaching with nails, the nails have a weak effect on preventing the fragile ALC from falling out, and the fixing strength of the wood is poor. There is a problem of not being able to obtain a degree.

[0005] Fixing with adhesive takes time for the adhesive to harden, resulting in poor installation efficiency. Another problem is that the fixing strength is weak.

[0006] Installation with screws and nails is easy as it only requires screwing from the wood to the ALC. It also provides good fixing strength, so it is more suitable for ALC than other mounting methods mentioned above. It is the most suitable.

[0007] 4 to 7 show different examples of conventional ALC screws.

[0008] The screw nail 1 of the first example shown in A and B of FIG. It has a structure in which a portion 4 is provided, and a screw 5 is provided that continues along the entire length of the outer circumferential surface of the shaft portion 2.

[0009] The screw nail 1 shown in A and B of FIG. However, it has a structure in which a non-threaded portion 6 is formed on the head 4 side.

0010 The screw nail 1 shown in FIGS. 7A and 7B is similar to that shown in FIG. It has a structure in which a wood cutting blade 7 is formed on the cutting surface.

[0011]

[Problem that the idea aims to solve]

First, the screw nail 1 shown in FIG. 5, when the tip of the screw 5 penetrates the wood 11, the tip of the screw 5 The protrusion 13 is pushed out on the back side of the wood 11 due to the edge slope, and the screw nail is pushed out as shown in FIG. 5B. As the protrusion 1 enters, the protrusion 13 is pushed wider, and the burr caused by the expansion of the protrusion 13 is A gap 14 is created between the ALC 12 and the wood 11 as shown in Fig. 5C, and as shown in Fig. 4B. There is a problem that the wood 11 cannot be fastened in close contact with the surface of the ALC 12. Ru.

0012 Also, even if you press the wood 11 toward the ALC 12, the screw 5 is fully screwed into the wood 11. Since both are screwed together, it is impossible to fill the gap 14 once created.

[0013] Next, in the screw nail 1 of FIG. 6, since the non-threaded part 6 on the head 4 side penetrates the wood 11, In the screwed state, the burrs on the wood 11 are held down and released by the pressure from the head 4. The wood 11 can be brought into close contact with the ALC 12, but if the head 4 is attached to the wood 11, When sinking, excessive force is applied to the screw 5 in the pulling direction, making it difficult to sink the head 4. It becomes difficult to rotate the head 4 in order to completely submerge it as shown in Figure 6B. , As shown by the dashed line in the figure, the screw 5 inside the ALC 12 breaks its own spiral and becomes empty. There is a problem in that the wood 11 cannot be fixed due to rotation.

[0014] Furthermore, the screw nail 1 shown in FIG. 7 cuts the wood 11 with the cutting blade 7 of the head 4, so the screw nail 1 shown in FIG. The head 4 sinks into the wood 11 better than the screw nail 1, but the wood 11 is If it is harder than expected, screw 5 will break its own spiral and become empty, similar to screw nail 1 in Figure 6. There is a problem that rotation occurs.

[0015] Therefore, this idea was developed to solve the problems with conventional screw nails as mentioned above. , it is possible to fix the wood in close contact with the ALC, and it can be fastened without twisting. Our goal is to provide screws that can be used in a variety of conditions.

[0016]

[Means to solve the problem]

In order to solve the above problems, this invention has a pointed end at the tip of the shaft and a head at the rear end. For screw nails with a threaded section, the outer periphery of the shank is sandwiched with the non-threaded section in between, and the tip end side The first screw and the second screw on the rear end side are provided separately, and the second screw is connected to the first screw. is a configuration provided at a position offset from the extension line of the helical wire of the first screw. This is what was adopted.

[0017]

[Effect]

When screwing from wood toward ALC, the first screw enters first, then the unthreaded part passes through the wood, after which a second screw is screwed into the wood.

[0018] The second screw is installed at a position offset from the extension line of the helical wire of the first screw. Therefore, the second screw is threaded into the wood in a different part from the spiral formed by the first screw. This second screw pushes the wood towards the ALC, causing the back side of the wood to The burr is released and the wood adheres to the surface of the ALC.

[0019] When sinking the head into the wood, use the pushing force of the screwdriver and the second screw screwed into the wood. This is done by retracting the screw, so the first screw threaded into the ALC No excessive load is applied and no spinning occurs.

[0020]

【Example】

Embodiments of this invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings.

[0021] As shown in FIG. 1, the screw nail 21 includes a circular shaft portion 22 having a predetermined length, and a circular shaft portion 22 having a predetermined length. A pointed end 23 provided at the tip of the shaft 22, a head 24 provided at the rear end of the shaft 22, and a shaft A first screw provided on the distal end side with a non-threaded portion 25 formed in the middle portion on the outer circumferential surface of 22 sandwiched therebetween. It is composed of a screw 26 and a second screw 27 provided on the head side.

[0022] The first screw 26 is a part that screws into the ALC, and has a predetermined pull-out strength. The threads are set to a length that is equal to or larger than the thread length, and are provided at a constant pitch in the range from the tip 23 to the non-threaded part 25. It is being

[0023] The second screw 27 is located near the head 24 and has a length that matches the thickness of the wood. The first screw 26 has a spiral in the same direction as the first screw 26 .

[0024] The positional relationship between the first screw 26 and the second screw 27 is as shown in FIG. The second screw 27 is in a position shifted from the extension line of the helical wire A of the screw 26. is set to

[0025] The screw nail of this invention has the above structure, and the wood 11 is attached to the ALC 12. It is used for fixing and presses the tip 23 against the wood 11 stacked on the ALC 12, A driver engaged with the head 24 applies pushing force and rotation to the screw nail 21.

[0026] First, the first screw 26 of the shaft portion 22 of the screw nail 21 is screwed into the ALC 12 from the wood 11. However, when penetrating the wood 11, burrs are generated on the back surface of the wood 11 by the tip 23. .

[0027] As the shaft portion 22 enters into the ALC 12, the non-threaded portion 25 penetrates the wood 11. As the shaft portion 22 advances further, the tip of the second screw 27 comes into contact with the wood 11.

[0028] When the tip of the second screw 27 comes into contact with the wood 11, as shown in FIG. The wood 11 is pushed towards LC12, the burr is removed by the pressure, and the back side of the wood 11 is moved to ALC1. 2, and there are no gaps.

[0029] The second screw 27 is screwed into the wood 11 after sufficiently pressing the wood 11. This first The second screw 27 is located at a position offset from the extension line of the helical wire A on the first screw 26. Since the spiral path of the wood 11 formed by the first screw 26 On the other hand, the second screw 27 will be screwed into a different position, and therefore the second screw 27 will be screwed into a different position. 27 is firmly screwed into the wood 11 without loosening.

[0030] After the second screw 27 is screwed into the wood 11, the head 24 is recessed into the surface of the wood 11. The head 24 is recessed by pressing with a screwdriver and by tightening the wood with the second screw 27. This is done by pulling the screwed part into the material 11, so it is possible to There is no excessive load on the first screw 26, so the screw nail 21 The wood 11 can be firmly fixed without the occurrence of empty rotation due to the destruction of the wood 12.

[0031] Note that the head 24 is pressed so that the resistance is reduced when the head 24 is depressed into the wood surface. A cutting edge 28 may be formed on the pressure surface as shown in FIG. 1.

[0032]

【effect】

As described above, according to this invention, there is a first screw on the tip side of the shaft portion and a second screw on the head side. The screws are provided separately with a non-threaded part interposed therebetween, and the first screw and the second screw are separated. The positional relationship of the second screw is shifted from the extension line of the helical wire of the first screw. Since the second screw is set in the right position, the tip of the second screw will push into the wood when screwing in. Therefore, it is possible to securely fix the wood in close contact with the ALC. .

[0033] Also, the second screw is threaded in a different position from the first thread formed in the wood. As the second screw is inserted into the wood, it is firmly screwed into the wood with no loosening. When sinking the head into the surface of the wood, pull in the part where the second screw screws into the wood. Therefore, there is no need to place a large burden on the first screw located within the fragile ALC. Therefore, it is possible to prevent the occurrence of hollow rotation due to the destruction of ALC, and the wood can be firmly fixed. Ru.

[Brief explanation of drawings]

[Figure 1] Front view of the screw nail according to this invention

[Fig. 2] Explanatory diagram showing the relationship between the first screw and the second screw

[Fig. 3] Explanatory diagram showing the screwed part of the second screw

[Fig. 4] A is a cross-sectional view showing the first example of a conventional screw nail during screwing, and B is a cross-sectional view showing the same fully screwed state.

[Fig. 5] A, B, and C are explanatory diagrams showing the process of starting screwing in the same as above.

[Fig. 6] A is a cross-sectional view showing a second example of a conventional screw nail during screwing, and B is a cross-sectional view showing the same fully screwed state.

[Fig. 7] A is a cross-sectional view showing a third example of a conventional screw nail during screwing, and B is a cross-sectional view showing the same fully screwed state.

[Explanation of symbols]

21 Screw nail 22 Shaft part 23 Point 24 Head 25 Non-threaded part 26 First screw 27 Second screw

Claims (1)

[Scope of utility model registration request] Claim 1: A screw nail having a tip at the tip and a head at the rear end, with a first screw on the tip side and a screw on the rear side on the outer periphery of the shaft, with a non-threaded part in between. A screw nail characterized in that a second screw is provided separately, and the second screw is provided at a position offset from an extension line of a helical wire of the first screw with respect to the first screw. .