JP2000025577A - Wiper arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble a retainer to an arm head without backlash and accurately assemble an arm spring by forming a support portion on the arm head, which is arranged inside the both side plates of the arm head and can support an arm spring locking pin. SOLUTION: A retainer connection portion 2a of an arm head 2 has side plates 2c, 2d, a bush 7 is inserted into shaft holes 2e, 2f respectively formed in them, and a retainer support shaft 8 is inserted into it. At respective ends 2c1, 2d1 of the side plates 2c, 2d, intermediate plates 2i, 2j are formed by folding the side plates 2c, 2d inward in the U shape in cross section. Pin holes 2m, 2q, part of a support 3, are provided in inner bodies 2k, 2n of respective intermediate plates, and an arm spring locking pin 9 is pressed into through side plate side pin holes 2g, 2h concentrically with the pin holes 2m, 2q. A storing portion 2r of an arm spring hook 6b is formed between the intermediate plates 2i, 2j. Thus, rigidity of the retainer connection portion 2a can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper arm used for swinging a wiper blade for wiping a surface to be wiped such as a windshield glass of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a wiper arm for swinging a wiper blade for wiping a surface to be wiped such as a windshield glass of an automobile, an wiper arm having an arm head and a retainer connected to the arm head has been known. I have. The arm head is molded from a metal plate,
This arm head has two opposing plates with the retainer side having a U-shaped cross section. And on the two boards,
While the retainer support shaft is rotatably supported,
An arm spring lock pin is fixed, a retainer disposed outside the two plates is fixed to a retainer support shaft, and an arm spring with one end locked to the retainer side is attached to the arm spring lock pin. The ends are locked.

[0003]

In the above-mentioned wiper arm, when the arm spring locking pin is press-fitted from one of the two plates of the arm head to the other plate, the plate is moved from one plate to the other plate. The length of the plate is large and the span is large, so one plate or the other plate is easy to bend, and when one plate or the other plate is bent, the retainer located outside the arm head rattles. There was a problem that occurred. Further, since the arm spring locking pin is fixed to the one plate and the other plate having a large distance between the arms, the arm spring locking pin is bent by the arm spring being locked, and the bent arm spring locking is performed. There is a problem that the tension of the arm spring may deviate from the design value due to the pin, and in addition to the above-mentioned problem, there is a possibility that the quality may be deteriorated.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-quality wiper arm in which a retainer can be assembled to an arm head without rattling and an arm spring can be accurately assembled.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a wiper arm having a first side plate and a second side plate which have a U-shaped cross section and are arranged opposite to each other, and which is connected to a retainer at one end. The retainer joint to be formed is formed,
An arm head having a pivot shaft coupling portion formed at the other end thereof with the pivot shaft, and a retainer support shaft rotatably supported by first and second side plates of the retainer coupling portion formed at the arm head. And an arm spring locking pin formed independently of the retainer support shaft and fixed to the first and second side plates of the retainer coupling portion formed on the arm head, and a wiper blade attached to one end, An arm piece having an end fixed to the retainer, an arm piece fixed to one end, and the other end disposed outside the first and second side plates of the arm head, and a retainer support shaft coupled thereto; A retainer that pivots with respect to the head, one end of which is locked to the arm piece, and the other end of which is locked to the arm spring locking pin, stretches between the retainer side and the arm head side. A wiper arm having an arm spring which imparts to the arm head, first,
The present invention is characterized in that a support portion is provided inside the second side plate and is capable of supporting the arm spring locking pin.

In the wiper arm according to a second aspect of the present invention, the support portion is connected to the ends of the first and second side plates of the arm head, and the first and second side plates are respectively opposed to the first and second side plates. It is characterized in that it is configured to be formed on each of the second middle plates.

The wiper arm according to a third aspect of the present invention is characterized in that an arm spring accommodating portion in which an arm spring can be arranged is formed between the first and second middle plates. .

In the wiper arm according to a fourth aspect of the present invention, the first and second side plates have side plate-side shaft holes for rotatably supporting the retainer support shaft, respectively, and an arm spring. A side plate side pin hole for supporting the locking pin is formed, and the first and second middle plates have an inner diameter smaller than that of the side plate side pin holes of the first and second side plates. It is characterized in that a middle plate side pin hole for supporting the locking pin is formed.

In the wiper arm according to a fifth aspect of the present invention, the first and second side plates are formed with side plate-side shaft holes for rotatably supporting the retainer support shaft, respectively. A side plate side pin hole for supporting an arm spring locking pin is formed in one of the second side plates, and the first and second middle plates have an inner diameter smaller than that of the side plate side pin hole. And a middle plate side pin hole for supporting the arm spring locking pin is formed.

[0011]

In the wiper arm according to the first, second, third, fourth and fifth aspects of the present invention, the arm head supports the arm spring locking pin by the first and second side plates and the first and second side plates. The arm spring locking pin is supported with high rigidity by also supporting the support portion disposed inside the side plate of the arm spring. Therefore, the first and second side plates do not bend. Further, the arm spring locking pin does not bend due to being supported by a small span.

[0012]

1 to 5 show a first embodiment of a wiper arm according to the present invention.

The illustrated wiper arm 1 includes an arm head 2, a support 3, a retainer 4, an arm piece 5, and an arm spring 6.

The arm head 2 is formed by pressing a metal flat plate into a U-shaped cross section. The arm head 2 has a first arm head side plate 2c and a second arm head side plate 2c on both sides of an arm head top plate 2b. The arm head side plates 2d are arranged to face each other. And in the arm head 2,
A retainer connecting portion 2a is formed at one end on the retainer 4 side. The first arm head side plate 2c and the second arm head side plate 2d at the retainer coupling portion 2a have a width L1 on the outside and a width L2 on the inside.

The first arm head side plate 2c and the second arm head side plate 2d are formed with a first arm head side plate side shaft hole 2e and a second arm head side plate side shaft hole 2f, respectively. First and second arm head side plate side shaft holes 2
e and 2f are round holes having an inner diameter slightly larger than the outer diameter of the bush 7, and the bush 7 is fitted into each of the first and second arm head side plate side shaft holes 2e and 2f. I have.

Since the bush 7 is formed to have a length slightly larger than the width L1 outside the first and second arm head side plates 2c and 2d, the ends are the first and second arms. They are arranged to slightly protrude from the head side plates 2c, 2d. A retainer support shaft 8 is inserted through the bush 7.

The retainer support shaft 8 is a rivet-shaped shaft member whose shaft portion 8a has an outer diameter slightly smaller than the inner diameter of the bush 7, and is rotatably supported by being inserted through the bush 7. Have been. Retainer support shaft 8
Is connected to an arm head connecting portion 4a provided on a retainer 4 described later.

As shown in FIG. 3, the first arm head side plate 2c and the second arm head side plate side shaft hole 2e and the second arm head side plate side shaft hole 2f are formed in the first arm head side plate 2c and the second arm head side plate 2d. Independently of the first arm head side plate side shaft hole 2
e, a first arm head side plate side pin hole 2g and a second arm head side plate side pin hole 2h are respectively formed below the second arm head side plate side shaft hole 2f in the drawing. Each of the first and second arm head side plate side pin holes 2g, 2h is formed as a round hole having an inner diameter slightly smaller than the outer diameter of the arm spring locking pin 9, and The arm spring locking pin 9 is press-fitted into each of the arm head side plate side pin holes 2g and 2h.

The arm spring locking pin 9 is a round bar-shaped member, and includes first and second arm head side plates 2c, 2c.
Since it is formed to have a length slightly smaller than the width L1 on the outside of d, the ends are arranged so as not to protrude from the first and second arm head side plates 2c, 2d.

The ends 2c1 and 2d1 of the first arm head side plate 2c and the second arm head side plate 2d on the opposite side to the arm head top plate 2b have a U-shaped cross section as shown in FIG. The first and second arm head side plates 2c and 2d are bent and formed inside.
A first middle plate 2i and a second middle plate 2j are respectively formed.

The first and second middle plates 2i and 2j are arranged near the center of the first and second arm head side plates 2c and 2d, respectively. As shown in FIG. 3, the first middle plate 2i and the first arm head side plate 2c are arranged at an interval L3, and the second middle plate 2j and the second arm head side plate 2d are , And are spaced from each other by a distance L4.

The first intermediate plate 2i is provided with a part of the support 3 on a first intermediate plate main body 2k which is parallel to the first and second arm head side plates 2c and 2d, respectively. The 1st middle board side pin hole 2m which comprises is formed.

The second intermediate plate 2j is provided with a part of the support portion 3 on a second intermediate plate main body 2n which is parallel to the first and second arm head side plates 2c and 2d. A second intermediate plate-side pin hole 2q to be formed is formed.

The first middle plate pin hole 2m of the first middle plate body 2k and the second middle plate pin hole 2 of the second middle plate body 2n
q is the first arm head side plate side pin hole 2g of the first arm head side plate 2c and the second arm head side plate 2d.
Are arranged concentrically with the second arm head side plate side pin holes 2h. Then, from the first arm head side plate side pin hole 2g of the first arm head side plate 2c described above, the first middle plate side pin hole 2m of the first middle plate body 2k and the second middle plate body 2n are formed. The arm spring locking pin 9 is press-fitted in the order of the second middle plate-side pin hole 2q and the second arm head side plate-side pin hole 2h of the second arm head side plate 2d described above to be fixed.

As shown in FIG. 3, between the first middle plate 2i into which the arm spring locking pin 9 is press-fitted and the second middle plate 2j, an arm spring accommodating portion 2r having an interval L5 is provided. An arm spring retaining portion 9a at the center of the arm spring retaining pin 9 is disposed in the arm spring receiving portion 2r. The distance L5 between the arm spring accommodating portions 2r is slightly larger than the outer diameter of an arm spring hook 6b provided in the arm spring 6 described later.

The first arm head side plate 2c has the first arm head side plate side pin hole 2g, and the first middle plate main body 2k disposed inside the first arm head side plate 2c. Side pin hole 2m, second middle plate side pin hole 2q of second middle plate main body 2n arranged inside second arm head side plate 2d, second arm head side plate of second arm head side plate 2d Arm spring locking pin 9 in side pin hole 2h
Is press-fitted, the spacing L3 between the first arm head side plate 2c and the first middle plate 2i, the spacing L4 between the second arm head side plate 2d and the second middle plate 2j, and the first The distance L5 between the plate 2i and the second middle plate 2j is significantly smaller than the width L2 inside the first arm head side plate 2c and the second arm head side plate 2d. , The second arm head side plate 2c, 2
d and the first and second middle plates 2i and 2j increase the rigidity of the retainer coupling portion 2a, so that the first arm head side plate 2c, the first middle plate 2i, the second middle plate 2j, Second
Since no large bending stress is applied to each of the arm head side plates 2d, the first arm head side plate 2c,
The second arm head side plate 2d does not bend with respect to the arm head top plate 2b.

The arm spring locking pin 9 is provided between a first middle plate 2i arranged inside the first arm head side plate 2c and a second middle plate arranged inside the second arm head side plate 2d. Arm spring locking portion 9 in arm spring receiving portion 2r formed between each of plates 2j
a is the arm spring hook 6b of the arm spring 6
The arm spring hook 6b is locked by the arm spring locking portion 9a, the interval dimension of which is significantly smaller than the width dimension L2 inside the first arm head side plate 2c and the second arm head side plate 2d. L5. As a result, the tension between the arm head 2 and the retainer 4, which is generated when the arm spring 6 is locked to the arm piece 5 described later, is applied to the first intermediate plate 2i and the second intermediate plate. 2j
The arm spring locking pin 9 does not bend due to the tension applied from the arm spring 6.

On the other hand, a pivot shaft coupling portion 2s is formed at the other end of the arm head 2 opposite to the retainer 4. As shown in FIG. 2, the pivot shaft coupling portion 2s includes an arm head top plate 2b, a first arm head side plate 2c, and a second arm head side plate 2d.
An arm head end plate 2t is provided, and a cylindrical end piece 10 is housed inside.

As shown in FIG. 5, the end piece 10 is held on the arm head top plate 2b by piece holders 2u and 2v formed at the lower end portions of the first and second arm head side plates 2c and 2d. Attached and held.
Arm head top plate 2b at pivot shaft joint 2s
Is formed with a round hole 2b1. End piece 10
A nut receiving portion 10a is formed below the round hole 2b1 of the arm head top plate 2b.
Pivot shaft mounting hole 10 vertically penetrated through
b is formed.

As shown in FIG. 2, the pivot shaft connecting portion 2s
0 is inserted into the pivot shaft mounting hole 10b, and a nut (not shown) is screwed into the pivot shaft 11 protruding from the pivot shaft coupling portion 2s, whereby the pivot shaft 11 is fixed to the pivot shaft 11. The pivot shaft 11 is coupled to a wiper motor (not shown) via a wiper link (not shown), and is reciprocated by the wiper link when the wiper motor operates.

A retainer 4 is coupled to a retainer coupling portion 2a of the arm head 2. The retainer 4 is press-formed by a metal flat plate into a U-shaped cross section. The retainer 4 is provided with a first retainer side plate 4c and a second retainer side plate 4d on both sides of a retainer top plate 4b. Have been.

The retainer 4 has an arm head connecting portion 4a formed on the arm head 2 side. As shown in FIG. 3, the first retainer side plate 4c and the second retainer side plate 4d at the arm head connecting portion 4a
The inner width L6 is slightly larger than the outer width L1 of the first and second arm head side plates 2c and 2d at the retainer coupling portion 2a.

The first retainer side plate 4c and the second retainer side plate 4d are provided with the first retainer side plate side shaft hole 4d.
e, a second retainer side plate side shaft hole 4f is formed. First and second retainer side plate side shaft holes 4e, 4f
Are formed in a round hole having an inner diameter slightly larger than the outer diameter of the retainer support shaft 8, and the first arm head side plate side shaft hole 2e and the second arm head side plate side shaft hole 2f of the arm head 2 are formed. Are arranged concentrically.

A retainer support shaft 8 is inserted into the first retainer side plate side shaft hole 4e and the second retainer side plate side shaft hole 4f. At this time, the retainer support shaft 8 is provided with the first retainer side plate side shaft hole 4e, the first arm head side plate side shaft hole 2e of the arm head 2, and the second arm head side plate side shaft hole 2e.
f, after being inserted into the second retainer side plate side shaft hole 4f, the outside of the second retainer side plate 4d is caulked and attached to the arm head coupling portion 4a. By attaching the retainer support shaft 8 to the retainer 4 and the arm head 2, the retainer 4 can rotate around the retainer coupling portion 2 a of the arm head 2 in the clockwise direction and the counterclockwise direction in FIG.

An arm piece 5 is fixed to a side of the retainer 4 opposite to the arm head 2. Arm piece 5
Is formed by a rod-shaped member, a base end portion of which is fixed by caulking to a retainer top plate 4b of the retainer 4 with a rivet pin 12, and a hook 5a for mounting the wiper blade 20 is formed at a distal end portion. . At the base end of the arm piece 5, an arm spring engaging portion 5b is formed.

The arm spring 6 is locked to the arm spring locking portion 9a of the arm spring locking pin 9 attached to the arm head 2 and the arm spring locking portion 5b of the arm piece 5, respectively.

The arm spring 6 is provided with an arm spring body 6a arranged on the retainer 4 side and an arm spring hook 6b arranged on the arm head 2 side, and one end of the arm spring body 6a is connected to the arm. Locked by the arm spring locking portion 5b of the piece 5,
The other end of the arm spring body 6a is locked to one end of the arm spring hook 6b, and the other end of the arm spring hook 6b is locked to the arm spring locking portion 9a of the arm spring locking pin 9, respectively. . The arm spring 6 has a function of applying a tension between the retainer 4 side and the arm head 2 side, so that the wiper blade 20 mounted on the distal end of the arm piece 5 is pressed against the wiping surface with a predetermined pressing force. Press.

The wiper arm 1 having such a structure is as follows.
The pivot shaft 11 is screwed to the pivot shaft coupling portion 2s of the arm head 2, and the wiper blade 20 is mounted on the tip of the arm piece 5 and mounted on the vehicle. The wiper blade 20 is disposed on a wiping surface (not shown).

When the wiper motor operates, the pivot shaft 11 reciprocates via the wiper link, so that the wiper arm 1 swings reciprocally on the wiping surface, so that the wiper blade 20 reciprocates on the wiping surface. It will be wiped with.

As described above, in the wiper arm 1, the arm spring locking pin 9 is disposed inside the first arm head side plate side pin hole 2g of the first arm head side plate 2c and inside the first arm head side plate 2c. The first middle plate side pin hole 2m of the first middle plate body 2k and the second middle plate side pin hole 2q of the second middle plate body 2n arranged inside the second arm head side plate 2d. The second arm head side plate 2d
The first arm head side plate 2c and the first middle plate 2i are pressed into the respective arm head side plate side pin holes 2h.
Distance L3 between the second arm head side plate 2d and the second arm head side plate 2d.
The distance L4 between the first and second middle plates 2i and 2j and the distance L5 between the first and second middle plates 2j and 2j are respectively smaller than the distance between the first arm head side plate 2c and the second arm head side plate 2d. The width L2 is significantly smaller than the width L2, and the first and second arm head side plates 2c, 2d and the first,
Since the rigidity of the retainer coupling portion 2a is increased by the second middle plates 2i and 2j, the first arm head side plate 2
c, the second arm head side plate 2d is the arm head top plate 2
There is no bending to b. Therefore, the first and second arm head side plates 2c and 2d and the first and second
Since there is no gap between the retainer side plates 4c and 4d, the retainer 4 can be assembled to the arm head 2 without play.

The arm spring locking pin 9 is provided between a first middle plate 2i arranged inside the first arm head side plate 2c and a second middle plate arranged inside the second arm head side plate 2d. Arm spring locking portion 9 in arm spring receiving portion 2r formed between each of plates 2j
a is the arm spring hook 6b of the arm spring 6
The arm spring hook 6b is locked by the arm spring locking portion 9a, the interval dimension of which is significantly smaller than the width dimension L2 inside the first arm head side plate 2c and the second arm head side plate 2d. L5. As a result, the tension between the arm head 2 and the retainer 4 generated when the arm spring 6 is locked to the arm piece 5 is applied to the first intermediate plate 2i and the second intermediate plate 2j. Since the arm spring locking pin 9 does not bend due to the tension applied from the arm spring 6, the tension of the arm spring 6 does not deviate from the designed value.

FIG. 6 shows a second embodiment of the wiper arm according to the present invention.

In this case, the second arm head side plate side pin hole 2h is formed in the second arm head side plate 2d of the arm head 2.
Are not formed, the arm spring locking pin 9 is made smaller in length than in the first embodiment, and the other parts are configured in the same manner as in the first embodiment.

The arm spring locking pin 9 is provided with a first arm head side plate side pin hole 2g of the first arm head side plate 2c, and a first middle plate main body 2k disposed inside the first arm head side plate 2c. Are inserted into the second mid-plate side pin hole 2q of the second mid-plate main body 2n disposed inside the second arm head side plate 2d. At this time, similarly to the first embodiment, the distance L3 between the first arm head side plate 2c and the first intermediate plate 2i, and the distance between the second arm head side plate 2d and the second intermediate plate 2j. L4
And the distance L between the first middle plate 2i and the second middle plate 2j
5 is significantly smaller than the width L2 inside the first arm head side plate 2c and the second arm head side plate 2d, and the arm spring locking pin 9 is attached to the second arm head side plate 2d. Because it is not supported,
A large bending stress is not applied to each of the first arm head side plate 2c, the first middle plate 2i, the second middle plate 2j, and the second arm head side plate 2d. The second arm head side plate 2d does not bend with respect to the arm head top plate 2b. Therefore, since there is no gap between the first and second arm head side plates 2c and 2d and the first and second retainer side plates 4c and 4d of the retainer 4, the retainer 4 is loosened on the arm head 2. Assembled without sticking.

The arm spring locking pin 9 is provided between a first middle plate 2i arranged inside the first arm head side plate 2c and a second middle plate arranged inside the second arm head side plate 2d. Arm spring locking portion 9 in arm spring receiving portion 2r formed between each of plates 2j
a is the arm spring hook 6b of the arm spring 6
The arm spring hook 6b is locked by the arm spring locking portion 9a, the interval dimension of which is significantly smaller than the width dimension L2 inside the first arm head side plate 2c and the second arm head side plate 2d. L5. As a result, the tension between the arm head 2 and the retainer 4 generated when the arm spring 6 is locked to the arm piece 5 is applied to the first intermediate plate 2i and the second intermediate plate 2j. Since the arm spring locking pin 9 does not bend due to the tension applied from the arm spring 6, the tension of the arm spring 6 does not deviate from the designed value. .

[0046]

As described above, according to the wiper arm according to the first, second, third, fourth and fifth aspects of the present invention, the arm head has the first and second side plates having the arm spring locking pins. By supporting the arm spring locking pin with high rigidity by supporting the arm spring locking pin with the support portion disposed inside the first and second side plates. Therefore, the first and second side plates do not bend. Further, the arm spring locking pin does not bend due to being supported by a small span. Therefore, there is an excellent effect that the retainer can be assembled to the arm head without rattling and the arm spring can be assembled with high accuracy to provide a high-quality wiper arm.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of a wiper arm according to the present invention.

FIG. 2 is a vertical sectional front view of the wiper arm shown in FIG.

FIG. 3 is a sectional view of the wiper arm shown in FIG.
A) It is a line end view.

FIG. 4 is a sectional view of the wiper arm shown in FIG.
B) It is a line end view.

FIG. 5 is a perspective view of the wiper arm shown in FIG.
C) It is a line end view.

FIG. 6 is an end view around an arm head in a second embodiment of the wiper arm according to the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 wiper arm 2 arm head 2a retainer coupling portion 2c (first side plate) first arm head side plate 2d (second side plate) second arm head side plate 2e (side plate side shaft hole) first arm head side plate side shaft Hole 2f (side plate side shaft hole) Second arm head side plate side shaft hole 2g (side plate side pin hole) First arm head side plate side pin hole 2h (side plate side pin hole) Second arm head side plate side pin hole 2i 1st middle plate 2j 2nd middle plate 2m (middle plate side pin hole) 1st middle plate side pin hole 2q (middle plate side pin hole) 2nd middle plate side pin hole 2r Arm spring receiving portion 2s pivot Shaft coupling part 3 Support part 4 Retainer 5 Arm piece 6 Arm spring 8 Retainer support shaft 9 Arm spring locking pin 11 Pivot shaft

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenichi Kuramochi 1760 Higashimatano-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (Reference) 3D025 AA01 AE04 AE05 AE23 AE33

Claims (5)

[Claims] 1. A retainer coupling part having a first side plate and a second side plate each having a U-shaped cross section and opposed to each other is formed at one end, and a pivot shaft is formed at the other end. An arm head having a pivot shaft coupling portion coupled to the arm head, and a first one of a retainer coupling portion formed on the arm head.
A retainer support shaft rotatably supported by the second side plate; and a retainer support shaft formed independently of the retainer support shaft and fixed to first and second side plates of a retainer coupling portion formed on the arm head. An arm spring locking pin, an arm piece having a wiper blade attached to one end thereof, and having the other end fixed to a retainer, the arm piece being fixed to one end, and the first arm head having the other end thereof. A retainer supporting shaft connected to the outer side of the second side plate, the retainer pivoting with respect to the arm head, one end locked to the arm piece, and the other end locked to the arm spring; A wiper arm provided with an arm spring that is locked to a pin and applies tension between a retainer side and an arm head side, wherein the arm head has first and second side plates. A wiper arm, wherein a support portion that is disposed inside and that can support the arm spring locking pin is formed. 2. A supporting portion is formed on each of first and second middle plates connected to the ends of the first and second side plates of the arm head and opposed to the first and second side plates, respectively. The wiper arm according to claim 1, wherein the wiper arm is provided. 3. The wiper arm according to claim 2, wherein an arm spring accommodating portion in which an arm spring can be arranged is formed between the first and second middle plates. 4. A side plate for supporting a retainer support shaft rotatably is formed in each of the first and second side plates, and a side plate for supporting an arm spring locking pin. A side pin hole is formed, and the first and second side holes are formed.
The middle plate is formed with a middle plate side pin hole having an inner diameter smaller than that of the side plate side pin hole of the first and second side plates and supporting the arm spring locking pin. Item 4. The wiper arm according to items 2 and 3. 5. A side plate side shaft hole for rotatably supporting a retainer support shaft is formed in each of the first and second side plates, and one of the first and second side plates is formed in one of the first and second side plates. A side plate side pin hole for supporting the arm spring locking pin is formed, and the first and second middle plates have an inner diameter smaller than the side plate side pin hole to support the arm spring locking pin. The wiper arm according to claim 2, wherein each of the intermediate plate side pin holes is formed.