JPH07108608B2 - Manufacturing method of tire blade for anti-icing road surface - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a tire blade for preventing icy road surfaces, which prevents slipping when traveling on a road frozen due to snow, freezing rain, etc., and scrapes the road surface at that time. The purpose is to obtain a tire that can be run without.

[0002]

2. Description of the Related Art Generally, spiked tires with metal pins are used to prevent slipping when traveling on a frozen road. In the spiked tire, the marking line displayed on a pedestrian crossing or the like disappears in order to scrape off the paved road surface, and the road surface is damaged, and pollution problems such as noise and dust occur. Especially, as for dust, falling ash dust consisting of scraped pavement components and spike pin metal powder is usually
Since the number is 10 times as high, there is a concern that the pneumoconiosis and chronic bronchitis may cause health problems to the residents.

Therefore, by using a tire blade and forming a narrow groove in the tire at a right angle to the direction of rotation or in a direction intersecting a predetermined inclination angle, the tire travels without slipping on a frozen road surface without using a spike pin. It has become possible to solve various problems of spike pins.

However, there are some problems with this narrow groove forming method. That is, as shown in FIGS. 6 and 7, a conventional tire blade has one metal thin plate 1'worked in a predetermined shape and a metal pin shaft of a predetermined thickness cut according to the width of the metal thin plate. Consists of 2 ',
A groove is cut in the length direction of the metal pin shaft, the lower end edge of the metal thin plate is inserted into the groove, and the insertion portion along the groove is welded by a gas burner by means of welding or the like. Then, the above-mentioned tire blade is incorporated into a tire mold to form a tire blade groove, and when the tire blade is pulled out after the processing is completed, a narrow groove for slip prevention is formed in the tire T.

That is, the above-mentioned thin metal plate has a plate thickness of 0.3.
~ 0.7 mm, pin shaft has a diameter of 1.0 ~ 2.0 mm
Since the thickness is the front or rear or the necessary thickness, the thin metal plate 1 ′ is inserted into the groove of the pin shaft, so that an angled internal angle θ is generated at the connecting portion. Further, it is quite troublesome to slit the metal pin 2 ′ into a slot, and in reality, inserting a thin metal plate into the slot 10 subjected to the slot is a manual work. Also, both ends of the pin shaft 2'must be rounded with a file or the like, but this is also done manually.

Therefore, during manufacture of a tire formed by forming an angled interior angle θ at the joint between the thin metal plate and the groove of the metal pin, rubber is likely to be cracked, which is one of the causes of an accident. There was a problem as.
Further, since the work of grooving the pin shaft 2 ', the end work of the pin shaft, and the laminating process of the pin shaft 2'and the thin metal plate 1'are precise and manual work, skillful techniques are required, There is a problem that it takes time and the cost becomes high.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object of the invention and to solve the problems of the prior art, the present invention provides a method for producing a tire blade for preventing icy road surfaces, A thin metal plate of arbitrary shape is bent in two, a pin shaft of a predetermined thickness is sandwiched between the two-folded bifurcated pieces, and the bent bifurcated pieces are positioned at the inner bottom, and the bifurcated pieces are pressed from the outer surface side. Then, when the two pieces are brought into close contact with each other, the boundary between the bent portion and the forked piece with the pin shaft sandwiched is gently formed without angling, and the vicinity of the close contact edge of the forked piece is welded and necessary. According to the above, a hole is drilled at a predetermined location.

[0008]

Embodiments based on the above means will be described with reference to the drawings. In the figure, 1 is a thin metal plate made of stainless steel having a plate thickness of about 0.3 to 0.7 mm, which is cut into a predetermined shape. 2 is a pin shaft made of stainless steel having a diameter of 1.0 to 2.0 mm, the length of which is the same as the lateral width of the thin metal plate or slightly shorter. 3 is a thin metal plate 1 2
A point welded part that is fixed so that the folded bifurcated piece does not come off,
Reference numeral 4 is an air vent hole formed in the bifurcated piece, 5 is a hole for pulling out the tire blade, 6 is a press die for bending the thin metal plate 1 into two pieces, and 7 is made of metal between the bifurcated pieces. 2 shows a press die for inserting and pressing the pin shaft 2 of FIG.

[0009]

[Specific Manufacturing Process Example] Next, a specific manufacturing process example according to the above-described embodiment will be described. (1) First, the metal thin plate 1 having a predetermined shape is bent into two substantially U-shaped folds by the first press die 6 · 6 ′. The inner width of the U-shaped bifurcated pieces 11 and 12 is set so that the separately prepared pin shaft 2 can be inserted. (2) Next, insert the pin shaft 2 between the U-shaped bifurcated pieces 11 and 12 of the thin metal plate and position it on the inner bottom portion 13 of the bent portion, and position the end so that it does not protrude from the lateral width of the thin metal plate 1. Make adjustments. (3) Then, using the second press die 7, 7 ', the forked piece
The boundary α between the bent portion and the bifurcated piece in which the pin shaft 2 is sandwiched is pressed gently from the outer surface of 11 and 12, and is gently formed without angling, and the shape also approximates the vertical cross-sectional shape of the flask. (4) Further, spot welding 3 is carried out in the vicinity of the close contact edges of the bifurcated pieces 11 and 12, and an air vent hole 4 is provided at a predetermined position if necessary.
And, the hole 5 for extracting the bifurcated piece is perforated. In this case, if necessary, a bending forming step of a mountain fold m and a valley fold g is added in a direction orthogonal to the lateral width direction of the spot-welded bifurcated piece. (5) Finally, the entire outer surface of the bifurcated pieces 11 and 12 is barrel-polished to complete the tire blade. (6) The tire blade obtained by the steps (1) to (5) is incorporated into a tire molding die in a direction intersecting with the tire rotation direction to mold the tire T, and after the tire molding is completed,
The tire blade is pulled out by hooking the pulling tool on the pull-out hole 5 of the bifurcated piece, so that the tire is blown along the direction intersecting the rotation direction or along the rotation direction.
A narrow groove is formed.

[0009]

Since the present invention is constructed as described above, it has the following effects. Firstly, the boundary between the bent portion with the pin shaft sandwiched and the bifurcated piece is formed gently without being angular, and the shape is similar to the vertical cross-sectional shape of the flask. The rubber is hard to crack during molding, so traveling is safe. Secondly, according to the present invention, since the flask-shaped narrow groove is formed in the direction intersecting with the tire rotation, it has elasticity and has a strong effect on snow and a frozen road surface. Thirdly, the U-shaped bending of a thin metal plate and the vertical cross-section flask shape with a pin shaft inserted can be easily and easily performed with a press die, so that no special skill is required for uniform quality. Can be manufactured in. Fourthly, by providing the air vent hole in the bifurcated piece that is bent in two and pressed and brought into close contact, the air accumulated in the rubber during tire production can be surely vented. Fifthly, since the bifurcated piece is provided with the pull-out hole, when the tire blade is taken out after the tire is manufactured by the molding die, if the pull-out tool is hooked in the hole and pulled out, it is combined with the elasticity of the rubber.
It can be taken out easily without damaging the tire. Sixth, the metal shaft pin is sandwiched between the metal thin plates, so that the pin terminal does not have to be filed as in the conventional case.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a tire blade for a frozen road surface manufactured by the method of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a schematic explanatory view showing steps (a) to (g) of manufacturing a tire blade according to the method of the present invention.

FIG. 4 is a vertical cross-sectional view of a first press die for forming a thin metal plate into a U shape.

FIG. 5 is a vertical cross-sectional view of a second press die for molding the forked piece into a flask shape.

FIG. 6 is a front view of a conventional tire blade for preventing icy road surfaces.

7 is a sectional view taken along line 7-7 of FIG.

[Explanation of symbols]

 1 Metal thin plate 2 Metal shaft pin 3 Spot welded part that fastens the vicinity of the edge of the closely contacted forked piece 4 Air vent hole made in the bifurcated piece 5 Extraction hole made in the bifurcated piece 6 First press die 7 Second Press mold

Claims (1)

[Claims] 1. A thin metal plate having an arbitrary shape is bent in two, and a pin shaft having a predetermined thickness is sandwiched between the two-folded bifurcated pieces and positioned at the inner bottom of the bent piece. When pressing both from the outer surface side to bring them into close contact, gently form the boundary between the bent part with the pin shaft and the bifurcated piece without angling, and close the close edge of the bifurcated piece. After welding and drilling holes at specified locations as needed,
A method for manufacturing a tire blade for use on a frozen road surface, which comprises polishing the entire outer surface.