JPH10122214A - Driving fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving fastener which can be easily manufacture, does not produce loss of material, and is reliably split so as to obtain a substantial pull-out strength. SOLUTION: In a driving fastener which comprises two shank bodies 22 and 23 which are a semi-circular cylindrical shape in cross section, one shank body 22 having a projecting part 24 at the tip part, and both shank bodies 22 and 23 being bounded by a washer 27, so that a head part 25 side of its other end slips under a head part 26 side of the other shank body 23, the projecting part 24 of one shank body 22 is press molded in such a way as it has a width smaller than the flat face width of the shank body 23 and a thickness larger than that of the shank body 22, material loss is eliminated, the projecting part 24 is not pulled back when driving the other shaft body 23, and a reliable split is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open leg type driving fastener used for fixing equipment and the like to a concrete frame or a block.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional split-type driving fastener used for the above-mentioned purpose is composed of a combination of two shafts 1 and 2 and has a circular shaft having a large shaft diameter. The round wire 3 is cut into a predetermined length, and a disk-shaped head 4 is forged at one end (see FIG. 5A). The semi-cylindrical shaft portion 6 is formed by cutting or press-cutting while leaving the circular shaft portion 5, and a semicircular hole 7 is punched in the head 4 to form one shaft body 1. 5 (B), (D)).

[0003] On the other hand, the shaft body 2 is formed on a semi-cylindrical shaft portion 8,
As shown in FIG. 5 (C), the two shafts 1 and 2 have the semi-cylindrical shaft 8 of the other shaft 2 inserted into the hole 7 of the head 4, and the two shafts 6 and 8 have the same shape. Driving fasteners are formed by combining the flat surfaces so as to overlap each other.

As another example of the driving fastener, in the fastener shown in FIG. 5C, the semi-cylindrical shaft portion 6 of the one-axis body 1 is formed of a wire having a semicircular cross section.
In some cases, the guide projection corresponding to the circular shaft portion 5 is formed by partially projecting a part of the semi-cylindrical portion toward the flat surface side by means such as a press.

[0005] As shown in FIG.
A pilot hole 11 in which both shafts 1 and 2 are provided in a concrete body 10
By inserting the other shaft body 2 through the fixed body 12 and driving in, the tip of the shaft body 2 is guided by the circular shaft portion 5 and bent outward, so that the two shaft bodies 1 and 2 The pullout resistance is obtained by opening the legs.

[0006]

However, in the former fastener, it is necessary to cut or press each of a part of the circular shaft and the head 4, so that the manufacturing process is troublesome, and furthermore, the material is difficult to use. There is a problem that a large amount of loss occurs.

In the latter fastener, since the guide projection of the open leg is press-formed, depending on the conditions of the mounting location, such as a hard concrete frame, the tip of the other shaft is driven when the shaft is driven. , And this is the main cause, and there is a problem that a large pull-out resistance cannot be expected.

It is an object of the present invention to provide a driving fastener which has no material loss, simplifies the manufacturing process, ensures a reliable opening by driving, and has a high pull-out strength. .

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises two shafts each having a substantially semi-cylindrical cross section, and one of the shafts has a projection at a tip end. And the other end head side is shifted to the lower side of the head side of the other shaft body, and combined such that the respective flat surface portions face each other, and the two shifted shaft bodies are combined with the head of one shaft body. In the driving fastener having a structure bundled with a washer near the front end, the protrusion on the tip side of one of the shafts has a width smaller than the flat surface width of the substantially semi-cylindrical shaft, and the thickness is Is adopted.

A second aspect of the present invention, in the first aspect of the invention, employs a configuration in which the projection at the tip is substantially circular in cross section having a cross section having a diameter smaller than the flat surface width of the substantially semi-cylindrical shaft body. It was done.

[0013] According to a third aspect of the present invention, the cross section is substantially semi-cylindrical.
Consists of two shafts, one of which has a projection at the tip,
Combine such that the heads of the other ends are shifted to the lower side of the head of the other shaft so that the flat surfaces face each other, and combine the two shifted shafts with a washer near the head of one shaft. A method for manufacturing a driving fastener having a structure bundled by: a metal round wire is intermittently forged by two molds each having a substantially semicircular recessed groove and the other having a flat surface; Forming a substantially semi-cylindrical shaft part having a wide width so that the round wire part and the substantially semi-cylindrical shaft part are alternately repeated while having a transition part therebetween; and a semi-disc near the starting end of the substantially semi-cylindrical shaft part. Forming one of the shafts through a step of forming the shape of the head by forging and a step of cutting near the starting end of the next substantially semi-cylindrical shaft beyond the round line of the substantially semi-cylindrical shaft Is adopted.

[0012] According to a fourth aspect of the present invention, the cross section is substantially semi-cylindrical.
Consists of two shafts, one of which has a projection at the tip,
The head side of the other end is shifted to the lower side of the head side of the other shaft body so that the flat surface portions face each other, and the two shifted shaft bodies are near the head of one shaft body. What is claimed is: 1. A method for manufacturing a driving fastener having a structure bundled by a washer, comprising: using a semi-circular wire having a semi-cylindrical cross section, forging from two edge directions on both sides of the semi-circular wire toward the center; Of the semi-circular wire so that the thickened portion narrower than the flat surface of the portion and thicker than the thickness of the semi-cylindrical portion is alternately repeated while the semi-cylindrical shaft portion and the thickened portion have transition portions in the middle. A step of forming intermittently in the axial direction, a step of forging a semi-disc-shaped head near the starting end of the semi-cylindrical shaft, and And a step of cutting near the starting end of the shaft portion to form one shaft body. It is.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

[0014] As shown in FIG.
Is composed of two shafts 22 and 23 having a substantially semi-cylindrical cross section. One of the shafts 22 has a projection 24 on the flat surface side of the distal end, and a semi-disc-shaped head 25 on the other end. The other shaft body 23 has a length substantially equal to that of the one shaft body 22, has a semi-disk-shaped head 26 at the other end, and has both shaft bodies 22 and 23.
Is the head 25 of the one shaft body 22 is the head 26 of the other shaft body 23
And the two flat shafts 22 and 23 are stacked together by a washer 27 near the head 25 of one of the shafts 22 so that the flat portions face each other. .

The projection 24 provided at the tip of the one shaft 22 has a width smaller than the flat surface width of the shaft 22, and the thickness is larger than the thickness of the shaft 22. The protruding portion 24 is formed in a substantially circular shape having a diameter smaller than the flat surface width of the shaft body 22 in the illustrated case.

FIGS. 2 and 3 show a method of manufacturing the one-sided shaft body 22, using a metal round wire 28 as a material. First, one of the two molds has a substantially semicircular concave groove and the other has a flat surface. The metal round wire 28 is intermittently forged, and the semi-cylindrical shaft portion 29 having a width longer than the diameter of the round wire 28 and having a predetermined length is inserted into the round wire portion 3.
0 and the substantially semi-cylindrical shaft portion 29 are formed so as to be alternately repeated while having a transition portion 31 in the middle.

At this time, the substantially semi-cylindrical shaft portion 29 and the remaining round wire portion 30 are, as shown in FIG.
The arcuate bottom surface and the outer peripheral bottom surface of the round wire portion 30 become the same surface,
Approximately half of the round wire 30 protrudes from the flat surface of the substantially semi-cylindrical shaft 29, and this protruding portion becomes the protrusion 24 of the one shaft 22.

As described above, the wire rod in which the substantially semi-cylindrical shaft portions 29 and the round wire portions 30 are alternately formed is then replaced with the substantially semi-cylindrical shaft portion 2
9, a semi-disc-shaped head 25 is formed by forging near the starting end, and thereafter, near the starting end of the next substantially semi-cylindrical shaft portion 29 beyond the round wire portion 30 of the substantially semi-cylindrical shaft portion 29, By repeating the above steps, one shaft body 22 is manufactured.

As another method of manufacturing one of the shafts 22, a semi-circular wire having a semi-cylindrical cross section is used as a material, and is forged toward the center from two edge directions on both sides of the semi-circular wire. A half-thick portion narrower than the flat surface of the semi-cylindrical shaft portion and thicker than the thickness of the semi-cylindrical portion is alternately repeated while the semi-cylindrical shaft portion and the thick portion have a transition portion in the middle. It is formed intermittently in the axial direction of the round wire, a semi-disc-shaped head is formed by forging near the beginning of the latter half cylindrical shaft part, and further from the end of the semi-cylindrical shaft part to the next half past the biased part. One shaft is manufactured by cutting the vicinity of the starting end of the cylindrical shaft and repeating this.

In this manufacturing method, the uneven thickness portion is formed in the same shape and condition as the round wire portion 30 in the previous manufacturing method, so that it becomes protruding on the flat surface side of the semi-cylindrical shaft portion.

FIG. 4 shows an example of use of the fastener 21.
A pilot hole 11 having a diameter at which the concrete frame 10 and the two shaft members 22 and 23 are fitted is drilled by a drill or the like, and the two shaft members 22 and 23 are inserted into the pilot hole 11 through the attachment 12 so that the one shaft member is formed. 22
When the head 26 of the other shaft 23 is driven into the lower hole, the other shaft 23 enters the prepared hole, and its tip rides on the protrusion 24 provided on the one shaft 22, and the other shaft 23 Is bent outward in an arc shape, and the two shaft bodies 22 and 23 are in a state where the legs are opened.

The protruding portion 24 is provided on the one shaft 22
Since it is thicker than the thickness of the substantially semi-cylindrical shaft portion 29, it is not pushed back by the other shaft member 23 at the time of driving, so that both the shaft members 22 and 23 are connected to the hard concrete frame 1.
Even at 0, the legs can be reliably opened, and a large pull-out resistance can be obtained.

[0023]

As described above, according to the present invention, in a fastener consisting of two shafts having a substantially semi-cylindrical cross section, one of the shafts and the projection is formed by forging one of the shafts. As a result, the processing steps can be simplified, and there is no waste of material, so that the manufacturing cost can be reduced.

Further, the projection provided on one of the shafts is formed to have a width smaller than the flat surface width of the substantially semi-cylindrical shaft and thicker than the thickness of the substantially semi-cylindrical shaft. Is not pushed back, and a large pull-out resistance can be obtained.

[Brief description of the drawings]

FIG. 1A is a front view of a driving fastener, and FIG.
Is the side view, (C) is the rear view

FIG. 2A is a front view showing a method of manufacturing a uniaxial body,
(B) is an enlarged sectional view of the arrow bb in (A).

FIG. 3 is a perspective view showing a method for manufacturing the one-shaft body.

FIG. 4 is a sectional view showing a use state of the driving fastener.

5 (A) to 5 (D) are explanatory views showing a manufacturing process of a conventional driving fastener.

FIG. 6 is a sectional view showing a use state of a conventional driving fastener.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Fastener 22, 23 Shaft 24 Projection 25 Head 26 Head 27 Washer

Claims (4)

[Claims] 1. A shaft body having a substantially semi-cylindrical cross section, one shaft body having a projection at a tip end, and a head side at the other end being lower than a head side of the other shaft body. So that
In a driving fastener having a structure in which each flat surface portion is combined so as to face each other and two displaced shafts are bundled by a washer near the head of one of the shafts, a protrusion on the distal end side of one of the shafts is substantially A driving fastener having a width smaller than a flat surface width of a semi-cylindrical shaft body and a thickness larger than a thickness of the shaft body. 2. The driving fastener according to claim 1, wherein the projection at the tip is substantially circular in cross section having a diameter smaller than the flat surface width of the shaft body having a substantially semi-cylindrical cross section. 3. A shaft comprising two shafts each having a substantially semi-cylindrical cross section. One shaft has a projection at a tip end, and the head of the other end is lower than the head of the other shaft. So that
A method for manufacturing a driving fastener having a structure in which two flat shafts are combined so that respective flat surface portions face each other, and two shafts are bundled by a washer near a head of one of the shafts, and one of the shafts has a substantially semicircular recessed groove. And the other has a flat surface 2
A metal round wire is intermittently forged by two molds, and a substantially semi-cylindrical shaft portion wider than the diameter of the round wire portion is alternately formed while the round wire portion and the substantially semi-cylindrical shaft portion have a transition portion in the middle. Forming a semi-disc-shaped head near the beginning of the substantially semi-cylindrical shaft portion by forging; and forming the next substantially semi-cylindrical shaft portion beyond the round wire portion of the substantially semi-cylindrical shaft portion. Cutting one near the starting end to form one shaft body. 4. A cross-section comprising two shafts having a substantially semi-cylindrical cross section, one of which has a protruding portion at the tip, and the head of the other end is lower than the head of the other shaft. So that
A method for manufacturing a driving fastener having a structure in which two flat shafts are combined so that respective flat surface portions face each other, and two shifted shafts are bundled by a washer near a head of one of the shafts. Using a wire, forging from the two edge directions on both sides of the semi-circular wire toward the center, forming a thickened portion narrower than the flat surface of the semi-cylindrical shaft portion and thicker than the thickness of the semi-cylindrical portion, A step of forming the semi-cylindrical shaft portion and the thickened portion intermittently in the axial direction of the semi-circular wire so as to alternately repeat while having a transition portion in the middle, and a semi-disc-like shape near the starting end of the semi-cylindrical shaft portion Forming one of the shafts through a process of forming the head by forging and a process of cutting near the beginning of the next semi-cylindrical shaft from the end of the semi-cylindrical shaft over the uneven thickness portion Manufacturing method of the driving fastener.