JPH0631211Y2 - Golden nail - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a metal nail for joining timbers to each other.

(Prior Art) Conventionally, various nails for joining timbers have been proposed for various purposes, but the projected area for splitting timber (cross-sectional area of legs) is large, but the contact area is large. In order to increase the joint strength with a small number of round nails, a large contact area, that is, a large diameter is required. In this case, there is no problem if the point to be hit is a distance sufficiently away from the end of the used wood (that is, a distance sufficient to absorb the splitting stress), but if it is hit at a position where the stress cannot be absorbed, it will be cut into the wood. It will tear and the joint strength cannot be maintained, and the struck wood will also be in a damaged state and will have to be replaced, resulting in loss of work and materials. Therefore, we try to prevent the occurrence of excessive shear stress by drilling the required holes in advance to prevent splitting.However, since labor and time are required for the drilling work of the holes, an efficient and economical joining means. Is required to be developed.

(Problems to be Solved by the Invention) In view of the above, the present invention has an object to provide a wood-bonding metal nail that does not cause splitting even if it is hit at the end of wood.

(Means for Solving the Problems) The gold nail of the present invention is a round nail in which a leg is circular, and the leg has a notch portion penetrating from a lower end of the leg to a head portion in a central portion of a cross section thereof, Further, the gold nail is formed by penetrating a punched hole through the outer periphery of the leg, which is electrically connected to the cutout portion, and disposing a cutting blade at the lower end of the leg. Here, notches include not only those arranged at the outer peripheral portion of a circular cross section but also those arranged at the center of the cross section, and in this case, the notches penetrate the head. Some are also provided.

(Function) Compared with a circular nail having the same circular cross section, the area of splitting (the projected area of the leg) is drastically reduced, so that splitting is less likely to occur, and the cutting edge at the tip of the leg reduces the shear resistance at the time of driving.

(Embodiment) The present invention will be described with reference to an embodiment. As shown in FIG. 1, a gold nail a of this invention has a fan-shaped notch 1 around the leg of a conventional round nail shown by phantom lines. 3 consisting of corner pieces 2 that evenly project in three directions so that
The outer end of the square piece 2 is formed into an acute angle with a size that fits within the outer circumference of a conventional round nail of each size, and its lower end is formed into a downward bevel 4 directed toward the center as shown in FIG. At the same time, the cutting edge 5 is wired along the ridgeline. In another embodiment of the present invention, a gold nail a'is a leg having a ring-shaped cross section in which a notch 6 is provided at the center of a circular cross section around the leg of a conventional round nail as shown in FIG. 7, the cutout portion 6 is provided so as to penetrate the head portion 8, and the lower end of the leg 7 has a slope 9 (not necessarily a slope) that intersects two opposing surfaces with a center line as shown in FIG. ) And a cutting edge 10 is provided on the cylindrical end surface of the slope 9. In addition, in the case of the golden nail a, the square piece is 3
Arrange more than one, shape the square piece into a spiral shape,
Alternatively, a notch 11 as shown by an imaginary line in FIG. 2 may be provided in the vertical axis direction of the square piece, or a fourth portion may be appropriately provided on the outer circumference of the leg of the gold nail a ′.
As shown by the phantom line in the figure, the through holes 12 are provided so as to prevent floating after the driving, and so on. At this time, when the nail a'is driven into the wood, the wood is pushed away by the outer periphery of the leg 7 outside the leg 7. Therefore, external pressure is applied to the outer circumference of the leg 7 from the surrounding wood, and accordingly, the hole 12 provided on the side surface of the leg 7 is clogged so that part of the wood bites into it. That is, the punch hole 12 is closed by the pressure inside the wood generated by the wood pushed away by the nail a ', thereby preventing the nail itself from rising.

When the golden nail a thus constructed is driven, the cutting blade 5 provided at the lower end of the square piece 2 easily shears the wood, the area of the square piece 2 excluded to the outside and the projection of the leg 3 are small. Since the area (cross-sectional area) is small, the surface pressure against a constant impact force becomes high, which makes it easier to drive and does not cause splitting, and the contact area is the same or larger than the same outer diameter size, so the joint strength is also Can be firmly secured. Further, when the gold nail a'is also hammered, the wood is sheared by the cutting edge 10 on the end face of the cylinder, the area compressed outward is small, and the wood sheared in a circular shape is stored inside the leg 7. Therefore, it does not contribute to the outward expansion of the wood, and the impact area is smaller than the round nail of the same size for a constant impact force, so the surface pressure becomes high as above. The above-mentioned gold nail a for ease of driving, splitting prevention, and great joint strength.
It is put to practical use with. That is, as shown in FIG. 5, in the truck bed or the like, since the floorboard 14 in the vertical direction is joined to the rootstock 13 in the horizontal direction in a butt shape,
Although it is a place where splitting is likely to occur during joining,
According to the gold nail of this invention, as described above, it is possible to firmly join without causing splitting.

(Effect of the device) As described above, according to the metal nail of the present invention, the compression area to the outside of the leg at the time of driving is small, and since the wood is sheared by the cutting blade, it is easy to perform without splitting. There is an effect that can be driven into. Further, by providing the holes in the legs, it is possible to prevent lifting after nailing.

[Brief description of drawings]

FIG. 1 is a plan view of a gold nail a according to the present invention, and FIG. 2 is a first view.
FIG. 3 is a plan view of the drawing, FIG. 3 is a plan view of a gold nail a ′ as another embodiment of the present invention, FIG. 4 is a front view of FIG. 3, and FIG. 5 is a partial plan view of a state of use. In the figure, 1 and 6 are notched parts, 2 are square pieces, 3 and 7 are legs, 4 is a beveled edge, 5 and 10 are cutting edges, 8 is a head, and 9 is a bevel. a and a'are gold nails.

Claims (1)

[Scope of utility model registration request] 1. A circular nail having a circular leg circumference, wherein the leg is
The center of the cross section is provided with a notch that penetrates from the lower end of the leg to the head, and a punched hole that penetrates to the notch is provided at the outer periphery of the leg, and a cutting blade is provided at the lower end of the leg. A golden nail that is characterized by being installed.