JPH021584B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing an anchor.

Conventionally, anchors used to fix various parts to foamed concrete or various types of insulation materials, and which have a shape consisting of two or more legs and a head, have been manufactured using a single piece of material. The manufacturing cost was extremely high because a notch (cut) was cut in the longitudinal direction from one end and the parts other than the head were separated into two or more legs to form expandable legs. Another method used has been to weld the ends of two or more leg materials together to form the head, but this method worsens the working environment and causes variations in strength (cracks occur at the head). There were flaws.

The present invention aims to solve these problems and enable high-strength anchors to be mass-produced at low cost and with high efficiency.The present invention is characterized by the following two points.
The main feature is that a ring is externally fitted onto the tip of a leg material larger than a book, and the tip is caulked to integrate the leg material and the ring to form the head of the anchor.

The present invention will be explained below based on illustrated embodiments.

FIG. 1 shows an example of an anchor manufactured according to the present invention, and this anchor 1 includes an anchor body 4 consisting of a head 2 and two legs 3, and
It is composed of a washer 5 fitted around the legs 3, 3 so as to be movable in the axial direction, and a shaft-like object 6, such as a nail, inserted between the legs 3, 3 from the distal end side.

Each of the two legs 3, 3 has a fan-shaped cross section of 180 degrees, and when the two legs are put together, a short cylindrical body is formed. Slanted surfaces 7, 7 are provided on the inner circumferential surface of the tip, and the diameter becomes smaller on the inner side, and when the anchor 1 is cast into aerated concrete, etc., by having these inclined surfaces 7, 7, two legs can be formed. 3, 3 expands the thighs (spreads the legs). The washer 5 prevents the legs 3, 3 from opening freely.

As shown in FIGS. 2 and 3, the leg materials 8 and 8 used to manufacture such an anchor 1 have a cross section made of metal such as aluminum or the same alloy.
The two wire rods A and A are shaped like a fan of 180 degrees, and small semicircular grooves 9 and 9 are respectively provided in the center so that when the two wire rods A and A are combined, they form a cylindrical body.

Leg materials 8, 8 made of such wire rods A, A
is first fed into the circular hole 11 of the die 10 from the direction of arrow B as shown in FIG.
At a position where the tips 8a, 8a slightly protrude from the
Pressure fixing member 13,1 provided inside the die 10
3 from the direction of arrows C and C to hold it fixed. Thereafter, the ring 14 is fitted onto the tips 8a, 8a as shown by arrow D.

Next, as shown in FIG.
7 to the ring 14 from the right direction in the same figure, and immediately press the caulking blade 16 in the direction of the arrow E as shown in FIG.
Crimp a, and attach the tips 8a, 8a and the ring 14.
are integrated to form the head 2 of the anchor.

More specifically, a small chamfer 18 is formed on the peripheral edge of the opening of the circular hole 11 to the die front surface 12, and a small chamfer 18 is formed on the tip surface of the caulking blade 16 to form the shape of the tips 8a, 8a after caulking. As shown in FIGS. 5 and 6, when the caulking blade 16 is pressed in the direction of the arrow E, the tip of the leg material 8 made of relatively soft metal is formed. 8a is plastically deformed so as to flow into the chamfer 18 and the recess 19, and is firmly pressed from the hole side of the annular ring 14, so that the head 2 is integrally formed.

In this way, the chevron-shaped cutter 20 is attached at the same time as the head 2 is caulked, or immediately before or after the caulking.
is extruded from the direction perpendicular to the plane of the paper as shown in FIG. 6 to cut the leg portion 3 into a predetermined short length and form the above-mentioned inclined surfaces 7, 7 into a V-shape.

Thereafter, the caulking blade 16 and punch 17 are moved back from the state shown in FIG.
3 is moved backward and the wire rods A and A are sent in the direction of arrow G, and the anchor body 4 after processing is pressed to the right in the figure and falls.

Next, the washer 5 is fitted onto the anchor body 4,
If the shaft-like object 6 is further pushed in from the tip, the anchor 1
is completed.

In addition, in the present invention, the shape and structure of the anchor 1 can of course be freely modified other than that shown in the drawings, and three or more leg materials 8 are used and integrated by caulking the head. , it is also preferable to use an anchor having three or more leg portions 3 . Moreover, the shape of the shaft-like object 6 can be freely deformed.

As described above, the present invention is to form a head of an anchor by fitting an annular ring onto the tips of two or more leg materials, caulking the tips, and integrating the leg materials and the annular ring. Therefore, there is no need for cutting to separate the legs or welding to integrate the head, making manufacturing easier and reducing costs, improving the working environment, improving work efficiency, and anchor quality. Improvements were made.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an example of an anchor manufactured by the manufacturing method according to the present invention, FIG. 2 is a side view showing a leg material, FIG. 3 is a cross-sectional view thereof, and FIG.
5 and 6 are cross-sectional side views showing the manufacturing process in order. 2...Head, 8...Leg material, 8a...Tip, 1
4...Circle.

Claims (1)

[Claims] 1. An anchor characterized in that a ring is fitted onto the tips of two or more leg materials, the tips are caulked, and the leg materials and the rings are integrated to form the head of the anchor. Production method.