JP2001080472A - Method of manufacturing for wiper blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the costs of dies by using extruded blade rubber. SOLUTION: The wiper blade manufacturing method comprises the first step of manufacturing an extrusion having a blade rubber body 9a, an anti-flip neck portion 9d, a wiping-surface pressure contact portion 9i and a portion 9i4 to cut away, the second step of cutting the extrusion manufactured in the first step into preset longitudinal lengths, and the third step of cutting the cut portion 9i4 integral with a vertex 9i3 of each wiping-surface pressure contact portion 9i away from the vertex 9i3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a wiper blade for wiping a wiping surface of an automobile windshield glass or the like.

[0002]

2. Description of the Related Art As a wiper blade for wiping a wiping surface of an automobile, a lever yoke is connected to a blade lever connected to a wiper arm, a blade rubber is gripped by the lever yoke, and a vertebra is housed in a groove provided in the blade rubber. What is known is. The blade rubber of such a wiper blade is formed by using a pair of molds arranged in the longitudinal direction and dividing the molds so that the vertebra does not come off. Had walls.

[0003]

However, in the above-described wiper blade, a molding method is used in which a pair of dies arranged in the longitudinal direction are divided, so that a different metal is used for each blade rubber having a different length dimension. Since the type is used,
There is a problem that the cost for the mold increases.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a wiper blade which can reduce the cost of a mold by using a blade rubber formed by extrusion molding. And

[0005]

Configuration of the Invention

[0006]

According to the method of manufacturing a wiper blade according to the first aspect of the present invention, a blade rubber main body, a fall prevention neck formed integrally with the blade rubber main body, and an integrated fall prevention neck are provided. And a wiper blade formed in a long shape, wherein a hollow portion is formed in the wiping surface pressure contact portion of the wiper blade, and a top portion of the wiping surface pressure contact portion is provided. In succession,
A first step of forming a cut part integrally with the top part and manufacturing a molded body composed of a blade rubber body, a fall prevention neck part, a wiping surface pressing part and a cut part by extrusion molding,
A second step of cutting the molded body manufactured in the step into a predetermined length in the longitudinal direction, and a third step of cutting off a cut portion formed integrally with the top of the wiping surface pressure contact portion from the top. Features.

[0007]

In the method for manufacturing a wiper blade according to the first aspect of the present invention, in the first step, a hollow portion is formed in the wiping surface pressure contact portion of the wiper blade, and the hollow portion is continuous with the top of the wiping surface pressure contact portion. Then, a cut portion is formed integrally with the top portion, and a molded body including a blade rubber body, a fall prevention neck portion, a wiping surface pressure contact portion, and a cut portion is manufactured by extrusion molding, and is manufactured in the second step and the first step. The formed body is cut into a predetermined length in the longitudinal direction, and in a third step, a cut portion formed integrally with the top of the wiping surface pressure contact portion is cut off from the top. Therefore, it is not necessary to use a different mold for each blade rubber having a different length dimension as compared with a method using a molding method of dividing a pair of molds arranged in the length direction.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[0009]

1 to 8 show a first embodiment of a method of manufacturing a wiper blade according to the present invention.

The illustrated wiper blade 1 includes a blade lever 2, a first lever yoke 3, a second lever yoke 4, a third lever yoke 5, a fourth lever yoke 6, a fifth lever yoke 7, and a 6 is comprised of a lever yoke 8, a blade rubber 9, a first vertebra 10, and a second vertebra 11.

The blade lever 2 is arranged at the center of the wiper blade 1. This blade lever 2 has
A wiper arm connecting portion 2b is provided substantially at the center of the lever body 2a.
Are formed. The wiper arm connecting portion 2 b is rotatably connected via a clip 13 to a wiper blade mounting portion 12 a formed at the tip of the wiper arm 12. A pivot shaft reciprocatingly rotated by the power of a wiper motor (not shown) is screwed to the base end of the wiper arm 12. The wiper arm 12 reciprocates on the wiping surface 50 when the wiper motor is operated.

The end of the blade lever 2 has first and second
Lever yoke coupling portions 2c and 2d are formed respectively. First lever yoke coupling part 2 arranged at one end
A blade lever coupling portion 3b formed at a substantially central portion of the first lever yoke 3 is rotatably coupled to c. 2nd lever yoke coupling part 2d arranged at the other end
, A blade lever connecting portion 4b formed substantially at the center of the second lever yoke 4 is rotatably connected.

The first lever yoke 3 includes a yoke body 3
The blade lever connecting portion 3b is arranged at a substantially central portion of a. The first lever yoke 3 has a third lever yoke coupling portion 3c formed at one end of a yoke main body 3a. A lever yoke connecting portion 5b formed substantially at the center of the third lever yoke 5 is rotatably connected to the third lever yoke connecting portion 3c.

The first lever yoke 3 includes a yoke body 3
A fourth lever yoke coupling portion 3d is formed at the other end of the portion a. A lever yoke connecting portion 6b formed substantially at the center of the fourth lever yoke 6 is rotatably connected to the fourth lever yoke connecting portion 3d.

The third lever yoke 5 includes a yoke body 5
A lever yoke connecting portion 5b is arranged at a substantially central portion of a. In the third lever yoke 5, a first blade rubber grip 5c is formed at one end of a yoke main body 5a. In the third lever yoke 5, a second blade rubber grip 5d is formed at the other end of the yoke main body 5a.

The fourth lever yoke 6 includes a yoke body 6
A lever yoke coupling portion 6b is arranged at a substantially central portion of a. In the fourth lever yoke 6, a third blade rubber grip 6c is formed at one end of a yoke main body 6a. The fourth lever yoke 6 has a fourth blade rubber grip 6d formed at the other end of the yoke main body 6a.

The second lever yoke 4 includes a yoke body 4
The blade lever connecting portion 4b is arranged at a substantially central portion of a. The second lever yoke 4 has a fifth lever yoke coupling portion 4c formed at one end of a yoke main body 4a. A lever yoke connecting portion 7b formed substantially at the center of the fifth lever yoke 7 is rotatably connected to the fifth lever yoke connecting portion 4c.

The second lever yoke 4 includes a yoke body 4
A sixth lever yoke coupling portion 4d is formed at the other end of the line a. A lever yoke connecting portion 8b formed substantially at the center of the sixth lever yoke 8 is rotatably connected to the sixth lever yoke connecting portion 4d.

The fifth lever yoke 7 includes a yoke body 7
A lever yoke coupling portion 7b is arranged at a substantially central portion of a. The fifth lever yoke 7 has a fifth blade rubber holding portion 7c formed at one end of a yoke main body 7a. The fifth lever yoke 7 has a sixth blade rubber grip 7d formed at the other end of the yoke main body 7a.

The sixth lever yoke 8 includes a yoke body 8
A lever yoke coupling portion 8b is arranged at a substantially central portion of a. The sixth lever yoke 8 has a seventh blade rubber holding portion 8c formed at one end of a yoke main body 8a. The sixth lever yoke 8 has an eighth blade rubber holding portion 8d formed at the other end of the yoke main body 8a.

The first blade rubber grip 5c of the third lever yoke 5 is formed in a C-shape as shown in FIG. The first blade rubber holding portion 5c includes:
A base 5c1, a first arm 5c2, a second arm 5c3, a first projecting piece 5c4, and a second projecting piece 5c5 are provided.

The base 5c1 has a yoke body 5a at the center.
And is formed in a plate shape continuous with. This base 5c1 is
When the wiper blade 1 is pressed against the wiping surface 50, the blade rubber main body 9 a of the blade rubber 9 is brought into contact with the top portion 9 a 0 so that the blade rubber main body 9 a does not tilt with respect to the wiping surface 50. It has the function to do.

The first and second arms 5c2 and 5c3 are formed by being bent at substantially 90 degrees from the end of the base 5c1 toward the wiping surface 50. First and second arms 5
Each of c2 and 5c3 is an interval dimension L shown in FIG.
1 and are inserted and locked by lever yoke locking portions 10d and 11d formed on the first and second vertebras 10 and 11, respectively.

The first and second protruding pieces 5c4 and 5c5 are formed by being bent at substantially 90 degrees in directions facing the tips of the first and second arms 5c2 and 5c3, respectively. The first and second protruding pieces 5c4, 5c5 have a clearance dimension L2 shown in FIG. 3 and are inserted into first and second lever grooves 9e, 9f provided in the blade rubber 9, respectively. The blade rubber 9 has a function of gripping the third lever yoke 5 so as not to come off.

Although not shown here, the second blade rubber holding portion 5d of the third lever yoke 5 has a base portion, a first arm portion, and a second arm portion, similarly to the first blade rubber holding portion 5c. Arm, a first protruding piece, and a second protruding piece are provided respectively, but the first arm and the second arm are formed on the first and second vertical brassiere 10, 11, respectively. It is not inserted into each of the lever yoke locking portions 10d and 11d.

Although not shown here, the third blade rubber gripper 6c of the fourth lever yoke 6 has a base, a first arm, and a second arm similar to the second blade rubber gripper 5d. , A first protruding piece, and a second protruding piece.

Although not shown here, the fourth blade rubber gripper 6d of the fourth lever yoke 6 has a base, a first arm, and a second arm similar to the second blade rubber gripper 5d. , A first protruding piece, and a second protruding piece.

Although not shown here, the fifth blade rubber holding portion 7c of the fifth lever yoke 7 has a base portion, a first arm portion, and a second arm portion, similarly to the second blade rubber holding portion 5d. , A first protruding piece, and a second protruding piece.

Although not shown here, the sixth blade rubber holding portion 7d of the fifth lever yoke 7 has a base portion, a first arm portion, and a second arm portion in the same manner as the second blade rubber holding portion 5d. , A first protruding piece, and a second protruding piece.

Although not shown here, the seventh blade rubber holding portion 8c of the sixth lever yoke 8 has a base portion, a first arm portion, and a second arm portion in the same manner as the second blade rubber holding portion 5d. , A first protruding piece, and a second protruding piece.

Although not shown here, the eighth blade rubber gripper 8d of the sixth lever yoke 8 has a base, a first arm, and a second arm similar to the second blade rubber gripper 5d. , A first protruding piece, and a second protruding piece.

In the blade rubber 9, the blade rubber main body 9a, the first vertebra storage section 9b, the second vertebra storage section 9c, the fall prevention neck 9d, the first lever groove 9e, the second lever groove 9f, and the first 9g, a second shoulder 9h, a wiping surface pressure contact portion 9i, and a hollow portion 9j are integrally formed by extrusion molding.

The blade rubber main body 9a is formed in a plate shape having a width L3 shown in FIG. 3 and a rectangular cross section. The top part 9a0 arranged at the upper end of the blade rubber main body 9a has a base part 5c1 formed on the first blade rubber gripping part 5c of the third lever yoke 5, and a second blade rubber of the third lever yoke 5. A base formed on the grip 5d, a base formed on the third blade rubber grip 6c of the fourth lever yoke 6, and a base formed on the fourth blade rubber grip 6d of the fourth lever yoke 5. , Fifth
The base formed on the fifth blade rubber holding portion 7c of the lever yoke 7, the base formed on the sixth blade rubber holding portion 7d of the fifth lever yoke 7, and the seventh portion of the sixth lever yoke 8 The base formed on the blade rubber holding portion 8c and the base formed on the eighth blade rubber holding portion 8d of the sixth lever yoke 8 are respectively brought into contact with each other.

On both side edges of the blade rubber main body 9a,
First and second vertebra housings 9b and 9c are formed respectively. First and second vertebra storage sections 9
Since b and 9c are formed by extrusion molding, they are arranged so as to penetrate in the length direction of the blade rubber main body 9a, and have the same length dimension as the blade rubber main body 9a. First,
The first and second vertebra storage portions 9b and 9c have first and second
Vertebras 10 and 11 are accommodated respectively.

A pair of lower surfaces 9a3, 9a4 provided on the blade rubber main body 9a are provided with first and second lever grooves 9e,
The upper wall portion 9f is formed.

As shown in FIGS. 5 and 6, the first vertebra 10 is provided with a vertebra main body 10a having a thin plate shape. At one end of the vertical bra main body 10a, a first retaining portion 10b bent in an L-shape from the vertical bra main body 10a is formed. At the other end of the vertical bra main body 10a, a second retaining portion 10c bent in an L shape from the vertical bra main body 10a is formed.

The first and second retaining portions 10b and 10c are provided so that the vertebra body 10a is the first of the blade rubber body 9a.
When stored in the vertical rubber storage portion 9b, the first vertical blade 10 is engaged with the first and second end faces 9a1 and 9a2 of the blade rubber main body 9a so that the first vertical It has a function to prevent it from falling out. In the same manner as the first vertebra 10, the second vertebra 11 has a vertical vertebra body 11a,
First and second retaining portions 11b and 11c are formed.

The vertical bar body 10a of the first vertical bar 10 has a lever yoke locking portion 10d, an elastic portion 10
e are formed respectively.

The lever yoke engaging portion 10d is formed in a concave shape near the first retaining portion 10b on the vertical bra main body 10a. This lever yoke locking portion 10d has
The vertical rubber main body 9a is the first of the blade rubber main body 9a.
The first arm portion 5c2 formed on the first blade rubber holding portion 5c of the third lever yoke 5 is inserted when the first arm portion 5c2 is accommodated in the vertical lever accommodation portion 9b.

The elastic portion 10e is connected to the lever yoke locking portion 10
d. The elastic portion 10e is formed by connecting the lever yoke engaging portion 10d to the first arm portion 5c2 formed on the first blade rubber grip portion 5c of the third lever yoke 5.
Press toward.

As shown in FIGS. 7 and 8, a lever yoke engaging portion 11d and an elastic portion 11e are formed on the second vertebra 11, respectively, as shown in FIGS.

The lever locking part 1 of the second vertical bra 11
1d, the second arm 5c3 formed in the first blade rubber grip 5c of the third lever yoke 5 is inserted.

The elastic portion 11e is provided with the lever yoke engaging portion 11
d is pressed toward the second arm 5c3 formed on the first blade rubber grip 5c of the third lever yoke 5.

The first and second vertebras 10, 11 are:
By being housed in the first and second vertebra housings 9b and 9c, respectively, the blade rubber main body 9a is provided with an elastic repulsive force to the blade rubber main body 9a such that the blade rubber main body 9a is uniformly bent according to the curved state of the wiping surface 50. I do.

The first and second vertebras 10, 11 are:
By storing the vertical vertebra main bodies 10a and 11a in the first and second vertical vertebra storage portions 9b and 9c of the blade rubber main body 9a, respectively, the first vertical vertebra 1
0, the first and second retaining portions 10b, 10c are respectively engaged with the first and second end faces 9a1, 9a2 of the blade rubber body 9a, while the first and second retaining portions of the second vertebra 11 are held. The portions 11b and 11c are locked to the first and second end surfaces 9a1 and 9a2 of the blade rubber main body 9a, respectively, so that the blade rubber 9 is prevented from falling in the length direction.

Then, from the left side in FIG. 1 of the assembly comprising the blade rubber 9 and the first and second vertebras 10 and 11, the first and second blade rubber gripping portions 5c of the third lever yoke 5 are provided. , 5d and the third of the fourth lever yoke 6,
The fourth blade rubber holding portions 6c and 6d, and the fifth and sixth blade rubber holding portions 7c of the fifth lever yoke 7,
7d and the seventh and eighth blade rubber gripping portions 8c and 8d of the sixth lever yoke 8 are passed through the blade rubber main body 9a of the blade rubber 9, and the first blade of the third lever yoke 5 at the tip end. The first and second arm portions 5c2 and 5c3 formed on the rubber holding portion 5c are inserted into and locked by the lever yoke locking portions 10d and 11d of the first and second vertebras 10 and 11, respectively. With respect to the rubber 9, the blade lever 2, the first, second, third, fourth, fifth, and sixth lever yokes 3, 4, 5, 6, 7, 8
Are positioned and assembled.

The fall prevention neck 9d is arranged below the blade rubber main body 9a. The fall prevention neck 9d is
First and second protruding pieces 5c4, 5c5 formed on the first blade rubber holding portion 5c of the third lever yoke 5 and smaller than the width L3 of the blade rubber main body 9a.
A projecting piece formed on the second blade rubber gripping portion 5d of the third lever yoke 5, and a projecting piece formed on the third and fourth blade rubber gripping portions 6c, 6d of the fourth lever yoke 6. Pieces, and projecting pieces formed on the fifth and sixth blade rubber holding portions 7c and 7d of the fifth lever yoke 7,
The sixth lever yoke 8 has a width dimension L4 smaller than each gap dimension L2 between the protruding pieces formed on the seventh and eighth blade rubber gripping portions 8c and 8d. The side surfaces 9d1 and 9d2 of the fall prevention neck 9d are provided with first and second lever grooves 9 respectively.
e, 9f are formed.

When the wiper arm 12 swings on the wiping surface 50, the tipping prevention neck 9d is moved to the blade lever 2, the first, second, third, fourth, fifth, and sixth lever yokes 3, 4, When the wiping surface pressure contact portion 9i of the blade rubber 9 is pressed against the wiping surface 50 to perform the wiping movement, the wiping surface pressure contact portion 9i moves integrally with the wiping surface 50.
Upright with respect to the wiping surface 50, and the blade rubber body 9
It has a function to support it from falling down from a.

The first and second shoulders 9g and 9h are arranged between the fall prevention neck 9d and the wiping surface pressure contact 9i. Upper surfaces 9g1, 9h1 of first and second shoulders 9g, 9h
Form lower wall portions of the first and second lever grooves 9e and 9f.

The first lever groove 9e is formed between the lower surface 9a3 of the blade rubber main body 9a and the side wall 9d1 of the fall prevention neck 9d.
And the upper surface 9g1 of the first shoulder 9g to form a U-shaped concave and have the same length as the blade rubber main body 9a.

The second lever groove 9f is formed between the lower surface 9a4 of the blade rubber main body 9a and the side wall 9d2 of the fall prevention neck 9d.
And the upper surface 9h1 of the second shoulder 9h to form a U-shaped concave and have the same length as the blade rubber main body 9a.

The first and second lever grooves 9e and 9f are provided with the first blade rubber grip 5c of the third lever yoke 5.
The first and second protruding pieces 5c4, 5c5 formed on the second lever rubber gripping portion 5d of the third lever yoke 5
And a fourth lever yoke 6
Projecting pieces formed on the third and fourth blade rubber gripping portions 6c and 6d, respectively, and projecting pieces formed on the fifth and sixth blade rubber gripping portions 7c and 7d of the fifth lever yoke 7, respectively. And the protruding pieces formed on the seventh and eighth blade rubber gripping portions 8c and 8d of the sixth lever yoke 8 are inserted.

The wiping surface pressure contact portion 9i is formed in an inverted isosceles triangle shape. The top plate 9i0 disposed above the wiping surface pressure contact portion 9i is integrated with the lower portions of the first and second shoulders 9g and 9h. The wiping surface pressure contact portion 9i is
There is no lip bent and pressed against zero.

As shown in FIG. 3, first and second side walls 9i1 and 9i2 forming isosceles are provided as shown in FIG.
The top 9i3 disposed at the center of the wiping surface 50 is pressed against the wiping surface 50. The top surface 9i3 of the wiping surface pressure contact portion 9i is selected to be 60 to 90 degrees. The wiping surface pressure contact portion 9i is kept upright with respect to the wiping surface 50 without falling down with respect to the blade rubber main body 9a by the fall prevention neck 9d.

The hollow portion 9j is formed inside the wiping surface pressure contact portion 9i in a triangular shape similar to the wiping surface pressure contact portion 9i so as to penetrate the entire length of the blade rubber 9. Hollow part 9j
Has a function of preventing the rigidity of the wiping surface pressure contact portion 9i from becoming unnecessarily high. Therefore, when the wiper blade 1 is reversed at the reversal position of the wiping surface, the reversal noise generated by the wiping surface pressure contact portion 9i whose rigidity is reduced by the hollow portion 9j is reduced.

In the wiping surface pressing portion 9i of the blade rubber 9, a cut portion 9i4 shown in FIG. 4 is formed at the tip of the second side wall 9i2 at the time of extrusion molding. By cutting the cut portion 9i4 along the second side wall 9i2, the center of the first side wall 9i1 and the center of the second side wall 9i2 can be reduced.
An apex 9i3 having an acute angle of from 90 degrees to 90 degrees is formed.

The wiper blade 1 has the following 3
It is manufactured by two processes.

In the first step, a hollow portion 9j is formed in the wiping surface pressure contact portion 9i of the blade rubber 9 of the wiper blade 1,
Further, a cut portion 9i4 is formed integrally with the top portion 9i3 of the wiping surface pressure contact portion 9i, and the cutout portion 9i4 is formed integrally with the top portion 9i3, and the blade rubber body 9a, the fall prevention neck 9d,
A molded body including the wiping surface pressing portion 9i and the cut portion 9i4 is manufactured.

In the second step performed after the first step,
The molded body produced in the first step is cut into a predetermined length in the longitudinal direction.

Then, in the third step performed after the second step, the cut part 9i4 formed integrally with the top part 9i3 of the wiping surface pressure contact part 9i is cut off from the top part 9i3.

As described above, in such a wiper blade 1, since the blade rubber 9 is formed by extrusion molding, the first and second vertebra housings 9b, 9 are provided.
c is penetrated so that the blade rubber 9 does not need to have a wall in the groove for accommodating the vertebra as in the prior art.
The first vertebra 10 accommodated in the first vertebra storage section 9b is stopped by the blade rubber 9 by the first and second retaining portions 10b and 10c, while the second vertebra storage of the blade rubber 9 is performed. The second vertebra 11 accommodated in the portion 9c is the first and second retaining portions 11
Since the blade rubber 9 prevents the first and second vertebras 10 and 11 from falling off the blade rubber 9, the blade rubber 9 is prevented from falling off by the blade rubber 9.

When the wiper arm 12 swings on the wiping surface 50, the blade rubber 9, the blade lever 2, the first, second, third, fourth, fifth and sixth lever yokes 3, Wiping surface 5 integrally with 4, 5, 6, 7, 8
0, and is moved by the elastic force of an arm spring (not shown) built in the wiper arm 12 to press against the wiping surface 9i.
When is pressed against the wiping surface 50 and wipes, the fall prevention neck 9d supports the wiping surface press-contact portion 9i so as to stand upright on the wiping surface 50, thereby splashing rainwater on the wiping surface 50. At this time, the first and second shoulders 9g,
9h, the first and second protruding pieces 5c formed on the first blade rubber gripping portion 5c of the third lever yoke 5
4, 5c5, a projecting piece formed on the second blade rubber grip 5d of the third lever yoke 5, and third and fourth blade rubber grips 6c, 6 of the fourth lever yoke 6.
d, the fifth and sixth blade rubber gripping portions 7c and 7d of the fifth lever yoke 7, and the seventh and eighth projections of the sixth lever yoke 8. By contacting with the protruding pieces formed on the blade rubber gripping portions 8c and 8d, respectively, the prevention of the wiping surface pressure contact portion 9i from falling down is promoted.

Then, the blade rubber 9 moves on the wiping surface 50 with the wiping surface pressing portion 9i standing upright with respect to the wiping surface 50 by the fall prevention neck 9d.
The wiping surface 5 after the wiping surface pressure contact portion 9i has passed does not catch the above rainwater between the wiping surface pressure contact portion 9i and the wiping surface 50, but instead splashes the rainwater with the wiping surface pressure contact portion 9i.
No thin water film is formed on zero. Of course, the wiping surface 50
Even if the water-repellent film is coated on the wiping surface 50 and the rainwater on the wiping surface 50 has become water droplets, the wiping surface pressing portion 9i causes the rainwater to be splashed in the same manner.

Further, when the wiper arm 12 swings on the wiping surface 50, the blade rubber 9 is provided with the neck 9d for preventing falling.
Accordingly, the wiping surface pressing portion 9i is slid on the wiping surface 50 in a state of standing upright without falling down with respect to the blade rubber main body 9a. When the wiper arm 12 is reversed at a predetermined reversing position, the wiping surface pressure contact portion 9i is switched so that the inclination angle with respect to the blade rubber main body 9a is reversed in any of the forward and backward movement directions. Since the rigidity of the wiping surface pressure contact portion 9i is reduced by the hollow portion 9j, the reversal sound is extremely small and the direction is quietly reversed.

FIGS. 9 and 10 show a second embodiment of the wiper blade according to the present invention.

In this case, the first and second blade rubber 9
Are formed in a pair of independent plate shapes.
A wiping surface pressure contact portion 9m is formed below the first and second shoulder portions 9g and 9h via a bent piece 9k. The first and second shoulders 9g and 9h are used to prevent the wiping surface pressure contact portion 9m from inclining more than necessary. Folded piece 9k
Has a function of allowing the wiping surface press-contact portion 9m to incline to some extent with respect to the wiping surface 50. And other parts,
The first and second vertebras 10 and 11 have the same structure as that of the first embodiment.
Although it has 11b, 10c, and 11c, the hollow portion 9j and the cut portion 9i4 in the first embodiment are not formed, and a lip 9m1 that is bent with respect to the wiping surface 50 is formed at the tip of the wiping surface press-contact portion 9m. I have.

[0067]

As described above, according to the method for manufacturing a wiper blade according to the first aspect of the present invention, in the first step, a hollow portion is formed in the wiping surface pressure contact portion of the wiper blade, and A cut portion is formed integrally with the top portion of the wiping surface pressure contact portion and is integrally formed with the top portion, and a molded body including a blade rubber body, a fall prevention neck portion, a wiping surface pressure contact portion, and a cut portion is manufactured by extrusion molding. In two steps, the molded body manufactured in the first step is cut to a predetermined length in the longitudinal direction, and in the third step, a cut part integrally formed on the top of the wiping surface pressure contact part is formed from the top. Be separated. Therefore, it is not necessary to use a different mold for each blade rubber having a different length dimension as compared with a method using a molding method of dividing a pair of molds arranged in the length direction. Therefore, the use of the blade rubber formed by extrusion molding has an excellent effect that the cost for the mold can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a wiper blade manufactured by a first embodiment of a method of manufacturing a wiper blade according to the present invention.

FIG. 2 is an external perspective view for explaining an assembling relationship of a blade rubber, a vertebra, and a lever yoke in the wiper blade shown in FIG.

FIG. 3 is a right side view of the wiper blade shown in FIG. 1;

FIG. 4 is a side view of the wiper blade shown in FIG. 1 when a single blade rubber is formed.

FIG. 5 is a bottom view of a first vertebra used in the wiper blade shown in FIG. 1;

FIG. 6 is a side view of the first vertebra shown in FIG. 5;

FIG. 7 is a bottom view of a second vertebra used in the wiper blade shown in FIG. 1;

FIG. 8 is a side view of the second vertebra shown in FIG. 7;

FIG. 9 is an external perspective view for explaining an assembling relationship of a blade rubber, a vertebra, and a lever yoke in a wiper blade manufactured by a second embodiment of the method of manufacturing a wiper blade according to the present invention.

FIG. 10 is a right side view of the wiper blade shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiper blade 9a Blade rubber main body 9d Fall prevention neck 9i Wiping surface pressure contact portion 9i3 Top 9i4 Cut portion 9j Hollow portion 9m Wiping surface pressure contact portion

Claims (1)

[Claims] 1. A blade rubber main body, a tipping prevention neck formed integrally with the blade rubber main body, and a wiping surface pressure contact part formed integrally with the tipping prevention neck are formed to be long. A method for manufacturing a wiper blade, comprising: forming a hollow portion in a wiping surface pressure contact portion of the wiper blade;
Further, a cut portion is formed integrally with the top portion of the wiping surface pressure contact portion continuously with the top portion, and a molded body including a blade rubber body, a fall prevention neck portion, a wiping surface pressure contact portion, and a cut portion is manufactured by extrusion molding. A second step of cutting the molded body produced in the first step to a predetermined length in the longitudinal direction, and cutting off a cut portion formed integrally with the top of the wiping surface pressure contact portion from the top A method for manufacturing a wiper blade comprising a third step.