JPH0158365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a driving member, such as a nail or a nail, which has a shaft portion to be driven into a mating member.

(Prior art and its problems) As shown in FIG. 7, the conventional nail 2 has a driving shaft portion 3.
The entire tip of the nail is wedge-shaped, and the nail is
When the nail is driven into the nail, the shaft of the nail acts as a wedge, creating a strong force that forces the material around the nail to spread outward.

Therefore, when the nail 2 is driven near the end 61 of the wood 6, cracks that reach the end 61 are likely to occur, and the nail loses its usefulness.

Particularly when driving thick and short nails, which are often used in two-by-four (2x4) construction, cracking of the end of the wood is inevitable.

Therefore, in the past, pilot holes were made with a drill or awl, etc., and then the nails were driven in to prevent the end of the wood from cracking.
There was a problem in that drilling pilot holes was time-consuming and significantly reduced nailing efficiency.

Therefore, nails shown in FIGS. 8 and 9 have been proposed for the purpose of preventing plates from cracking.

The nail shown in FIG. 8 has a shaft 30 with a hemispherical tip and a guiding protrusion in the center, and the nail shown in FIG. The tip of the shaft portion is formed in two stages.

Both of the above two nails reduce the wedge effect of the nail and prevent the end of the wood from cracking.

However, in the case of FIG. 8, the tip except for the protrusion 4 is formed into a hemispherical shape, and a force is generated in the spherical surface 33 that pushes the material around the driving part outward and causes cracks in the material to be driven. The effect of preventing this is small.

Further, in the case of FIG. 9, the tip of the nail is generally wedge-shaped like a conventional nail, so that it can hardly be expected to be effective in preventing cracking of the material to be driven.

By making the tip of the nail flat, there will be no wedge effect when driving the nail, and this will prevent the end of the wood from cracking.

However, the sharp end of the nail plays an important role in preventing the nail from shifting its driving position and as a guide for the nail to penetrate straight through the wood. It is not possible to hit the ball straight to the exact spot.

Furthermore, the above-mentioned problem of cracking at the end of the wood also applies to the cracking.

(Means for Solving the Problem) The present invention solves the above-mentioned problem, and provides a driving member such as a nail, a gaiter, etc., which has a driving shaft portion 3, which has a driving shaft portion 3 having a uniform thickness. The distal end thereof is a flat surface 5 perpendicular to the axis, and a pointed protrusion 4 is formed at the center of the flat surface.

(Operation and effect) Push the tip of the protrusion 4 strongly to the driving position of the wood,
If you drive the driving member 1 in this state, the driving position will not shift, and when the shaft 3 penetrates the wood, the projection 4 will lead the shaft 3 straight, so you can place the driving member 1 in the correct position. You can type directly into

The wood material in contact with the protrusions 4 is pushed out to some extent by the wedge action of the protrusions, but the protrusions are smaller compared to the conventional case where the entire tip of the shaft is pointed, and the wood material is pushed and spread out slightly. The force is weak, and the flat surface 5 at the tip of the shaft part 3 is perpendicular to the shaft center, so there is no wedge effect on the wood to be driven into, and it crushes the wood material around the protrusion 4 downward, crushing the surrounding material. In order to advance while increasing the density of the
The force of the protrusions 4 to push and spread the wood material in the lateral direction is reduced by half, and the density of the material around the shaft is increased to prevent the shaft from coming off.

Furthermore, since the shaft portion 3 other than the protrusion has a uniform thickness, there is no wedge effect in the shaft portion that would cause cracks in the other member to be driven, and therefore, when the shaft portion 3 is driven into wood, , can prevent cracking at the wood end.

(Example) Fig. 1 shows the present invention applied to a nail, with a head 2 at one end of a round shaft-like shaft portion 3 of uniform thickness, a flat surface 5 at the other end, and a flat surface 5 at the center of the flat surface. A conical or pyramidal protrusion 4 is formed. The flat surface 5 constitutes an annular step 5 surrounding the protrusion 4.

The maximum diameter of the projection 4 is 1/3 to 2/3 of the diameter of the shaft portion 5.

FIG. 5 shows another embodiment in which the shaft of the nail 1 is used as a shaft main body 31, and a cylindrical body 32 is fitted onto the shaft main body 31 to form the shaft portion 3.

The length of the cylindrical body 32 is equal to the length of the axis of the nail excluding the sharp portion at the tip, the tip of the nail is the protrusion 4, and the tip surface of the cylindrical body is the annular flat surface 5.

FIG. 6 shows another embodiment in which the present invention is implemented in a U-shaped gap, in which a flat surface 5 is provided at the tips of the driving shaft portions 3, 3 on both sides, and a protrusion similar to that shown in FIG. Child 4 is formed.

The present invention is not limited to the above embodiments,
Various modifications are possible within the scope of the claims.

[Brief explanation of drawings]

Fig. 1 is a front view of the nail according to the present invention, Fig. 2 is an enlarged view of the tip portion of the same, Fig. 3 is a slope view of the same as the above,
Fig. 4 is a sectional view of the tip of the nail, Fig. 5 is a sectional view of another embodiment in which two members are combined, Fig. 6 is a front view of the rinsing according to the present invention, and Fig. 7 is a conventional example. 8 and 9 are front views of the main parts of a conventional nail, which has a distinctive tip. 1... Nail, 3... Shaft, 4... Protrusion, 5... Annular step, 7... Scratch.

Claims (1)

[Scope of Claims] 1. In a driving member such as a nail or a screwdriver having a driving shaft portion 3, a flat surface 5 perpendicular to the axis is formed at the tip of the driving shaft portion 3 having a uniform thickness, A driving member characterized in that a small-diameter protrusion 4 with a pointed tip is provided protruding from the center of the flat surface 5. 2 The shaft portion 3 has a shaft main body 31 with a pointed tip and a cylindrical body 32.
The driving member according to claim 1, wherein the driving member is configured by fitting the cylinder body 32 with the cylinder body 32 and the distal end surface of the cylinder body 32 is an annular flat surface 5.