JPH04102709A - Nail and its manufacture - Google Patents

Abstract

PURPOSE:To improve the strength of tapered parts, enable effective formation and mass production by forming a head part where leg pieces each having a tapered part at its foremost end while being connected to each other at the base, i.e., the rear end, thereof mutually closed, in a flat head shape projecting from a cross sectional flat line in the cross direction by caulking. CONSTITUTION:Two leg pieces 2 which are provided with tapered parts 1 formed at their one end parts and closed mutually at the other end parts are formed of a cross sectional flat wire material, and a head part 3 connecting both of the leg pieces 2 to each other at the base in a flat head shape projecting in the cross direction by caulking. The structure becomes simple to thereby enable mass production at low cost accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nail used for an anchor or the like and a method for manufacturing the same.

[Prior art and problems to be solved by the invention] Conventionally, nails used as anchors used for fixing various parts to foamed concrete or various types of insulation materials have a shape consisting of two or more leg pieces and a head. In this method, a notch (cut) was cut in the longitudinal direction from one end of a single material, and the parts other than the head were separated into two or more legs to form expandable legs, so the manufacturing cost was reduced. had the problem of being extremely expensive. Furthermore, since the sloped portion provided at the end of the leg of the nail is also formed by cutting, the strength is weak and the nail cannot be driven smoothly.

SUMMARY OF THE INVENTION Therefore, the present invention aims to solve the above-mentioned problems and to provide a nail with a strong sloped portion at the end of a leg and a manufacturing method that enables mass production of the nail in which the sloped portion can be efficiently formed. OBJECTIVES (Means for Solving the Problems) In order to achieve the above objects, the present invention has a sloped portion at the tip and connects two mutually closed leg pieces into a single flat cross-section. The head, which connects both leg pieces at the base, is formed by caulking into a flat head shape that protrudes laterally.Furthermore, the metal wire having a flat cross section is used as a finished product. Press from the thickness direction at a pitch of about twice the total length of the nail to form a thin sloped rolled part on the wire, cut and remove the protruding part in the width direction of the rolled part, and The longitudinal center of the rolled part is cut, and then the longitudinal center of the 1-pitch wire having sloped parts at both ends is bent into an 11-shape using a bending press head to form a U-shaped intermediate body, and the IU The vicinity of the proximal end of the character-shaped intermediate body is pinched from both outsides by pinching blocks to form a leg piece and a proximal curved portion, and then, while maintaining the sandwiched state, the pinching block and the head crimping block are moved relative to each other. The curved portion is caulked into a flat head shape that protrudes laterally.

[For production]

All you need to do is pour it into foamed concrete or high-grade insulation material.

Since the sloped portions at the tips of both leg pieces are formed by rolling, they have high hardness and smooth surfaces, and both leg pieces can be driven smoothly while the legs are spread apart. The sloped portion is formed by pressing the metal wire from the thickness direction at a pitch of approximately twice the total length of the finished nail to form a thin sloped rolled portion in the wire. , is formed by cutting and removing the protrusion in the width direction of the rolled part and cutting the longitudinal center of the rolled part.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 shows an embodiment of a nail according to the present invention. The nail 5 is
two mutually closed straight leg pieces 2.2 each having a sloped part 1.1 inclined inward at the tip;
It is comprised of a flat head-shaped head 3 projecting laterally and connecting the leg pieces 2, 2 at the base. The nail 5 is formed from a single wire rod 4 having a flat cross section, and the head 3 is caulked. The wire 4 used has a cross-sectional shape as shown in FIG. 2, for example. A wire rod 4 with a rectangular cross-sectional shape (Fig. 2 I), a wire rod 4 with a substantially semicylindrical shape (Fig. 2 ■)
, ” A substantially rectangular wire rod 4 (second
Figure 111) etc. are used.

The method for manufacturing the nail 5 is as shown in FIGS. 3 and 4, in which the metal wire 4 having the flat cross section is intermittently fed in the direction of arrow A. The wire rod 4 is first pressed from above in the thickness direction at a predetermined pitch p that is approximately twice the total length of the nail 5 as a finished product to form a thin gradient rolled portion 6. The rolled portion 6 (in this case, protruding portions 7 and 7 are naturally formed in the width direction. The pressing is carried out using a pressing press block (not shown). Next, the wire 4 is rolled by 1 bift p in the direction of arrow A. The @rolled part 6 is cut by a cutting cutter (not shown) to cut the protruding parts 7.7 and at the center in the longitudinal direction of the rolled part 6. A 1-pitch wire rod 8 having a portion 1.1 is formed.The center portion of the 1-pitch wire rod 8 is pressed in the direction of arrow B by a bending press head 9, and the press head 9 and a pair of clamping The blocks 11, 11 are bent into a U-shape to form a U-shaped intermediate body 10 (see Figure 5).Here, the pressing breath block, the cutting cutter, the bending press head 9 and one It is placed in the upper mold.

As shown in FIG. 5, the formed U-shaped intermediate body 10 is
It is supported by the base and the head crimping block 13.

Next, the press head 9 is retracted upward, resulting in the state shown in FIG. 6. Near the proximal end of the U-shaped intermediate body from both outside (
The legs 2, 2 and the proximal curved portion 12 as shown in FIG. 7 are formed by pinching and pressing with the clamping blocks 11, 11 (from the direction of arrows C and C). Thereafter, while maintaining the clamping state of the clamping blocks 11.11, as shown in FIG. By pressing, a flattened head 3 protruding laterally is caulked. here,
In this step, the head 3 is formed by bringing the head crimping block 13 closer to the clamping block 11.11, or by moving both the clamping block 11.11 and the head crimping block 13 to bring them closer together. It is free to form the head 3.

As shown in FIG. 9, the completed nail 5 falls downward as the head staking block 13 escapes laterally and the clamping block 11 is separated outwardly (in the direction E, E).

It should be noted that the present invention is not limited to the above-described embodiments, and design changes may be made without departing from the gist of the present invention.

〔Effect of the invention〕

Since the present invention is configured as described above, it achieves the remarkable effects described below.

(2) According to claim 1, since it is formed from one wire rod 4 and has a simple structure, it can be mass-produced at low cost. Moreover, there are no connecting parts, so even if you hit it with a strong hammer, it will not disassemble.
It cannot be destroyed.

(2) According to claim 2, since the sloped portion 1.1 is formed by rolling with a pressing press, the sloped portion 1.1 can be efficiently formed to have a smooth and hard surface, and therefore it can be used smoothly as an anchor. The leg pieces 2, 2 can be reliably opened and firmly fixed inside the ALC etc.

(2) According to claim 2, the nails 5 can be continuously and automatically mass-produced.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a sectional view showing a wire rod, Fig. 3 is a simplified plan view for explaining the manufacturing process, Fig. 4 is a front view of the same, Figures 5, 6 and 7
8 and 9 are simplified front views showing the order of manufacturing steps. 1... Gradient part, 2... Leg piece, 3... Head, 4...
・Wire rod, 5... Nail, 6... Gradient rolling part, 7...
Projection part, 8... 1-pitch wire rod, 9... Press head for bending, 10... U-shaped intermediate body, 11... Clamping block, 12... Base end curved part, 13...・Head crimping block.

Claims (1)

[Claims] 1. Two mutually closed leg pieces 2, 2 having sloped parts 1, 1 at their tips are formed of one wire rod 4 having a flat cross section, and further, both leg pieces A nail characterized in that a head 3 that connects 2 and 2 at the base is caulked into a flat head shape that projects laterally. 2. A metal wire rod 4 having a flat cross section is pressed from the thickness direction at a pitch of about twice the total length of the nail 5 as a finished product to form a thin gradient rolled part on the wire rod 4. 6, cut and remove the protruding parts 7, 7 in the width direction of the rolled part 6, and cut the longitudinal center of the rolled part 6, and then cut a 1-pitch wire 8 having slope parts 1, 1 at both ends. The central part in the longitudinal direction is bent into a U-shape using the bending press head 9.
A character-shaped intermediate body 10 is formed, and the vicinity of the proximal end of the U-shaped intermediate body 10 is sandwiched between sandwiching blocks 11, 11 from both outer sides to form leg pieces 2, 2 and a proximal curved portion 12, and then, While maintaining the clamping state, the clamping blocks 11, 11 and the head crimping block 13 are brought relatively close to each other, and the curved portion 1
1. A method for manufacturing a nail, characterized in that the nail is caulked into a flat head shape that protrudes laterally.