JP2007015636A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of chatter in a wiper blade of a wiper device. <P>SOLUTION: The wiper device 10 is provided with a wiper arm 11 which comprises an arm head 12 having one end connecting with a wiper shaft and an arm shank 13 having a base end part connected with a tip of the arm head 12; and with the wiper blade 30 having a connection block 40 of which intermediate part is rotatably connected with a tip part of the arm shank 13. The arm shank 13 is covered with an arm cover 20 covering a hook 16 of an arm piece 15, and chatter suppressing parts 28, 28 abutting on wall outer faces in both sides of the connection block 40 are provided in the arm cover 20. Since the chatter suppressing parts 28, 28 of the arm cover 20 hold the connection block 40 to suppress chatter of the wiper blade 30, noise caused by chatter can be prevented even in the wiper device having a tournament type wiper blade, a fin type wiper blade or a wiper blade with a blade main body covered with a rubber cover. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wiper device, for example, a wiper device effective for use in wiping a windshield of an automobile.

Generally, a wiper device has a wiper arm having an arm head whose base end is connected to the wiper shaft, an arm shank whose base end is connected to the tip of the arm head, and a rotation of a connecting part disposed in the middle part. And a wiper blade having the tip of the arm shank connected by a shaft. The wiper blade wipes the wind glass as the wiper arm is reciprocally rotated by the wiper shaft.
By the way, in such a wiper device, for example, when a long wiper blade is wiped by a large wiper device, the base end side, which is the wiper shaft side portion of the wiper blade, is faster than the distal end side. Therefore, the followability to the wiper arm may be deteriorated, or the wiper blade may vibrate finely (so-called chatter) to generate abnormal noise.
Therefore, a wiper device that improves the followability to the wiper arm by supporting the base end side of the wiper blade with a support member provided on the wiper arm, or suppresses the chatter of the wiper blade to prevent the generation of abnormal noise is proposed. Has been.
An example of this type of conventional wiper device is disclosed in Patent Document 1.
In this structure, the support member is provided with a concave groove-like support recess in the wiper arm, while a support receiver is integrally provided on the wiper blade side, and the support receiver is slidably fitted in the support recess. ing.

JP-T-2001-501893.

  However, the above-described wiper device includes a wiper blade of a type in which a plurality of rigid levers are stacked like a tournament type wiper blade, and the wiper blade is supported by a support recess at a position away from the connecting portion of the wiper arm. In this case, chattering can be suppressed by holding the support recess on the wiper arm side by the rigidity of the lever. However, with the wiper blade covered with a rubber cover and the wiper blade covered with a rubber fin cover, even if the position away from the connection with the wiper arm is held by the support recess, the rubber There is a problem in that chattering cannot be suppressed due to the elasticity of the wiping, and the wiping performance deteriorates due to chattering during wiping.

  The object of the present invention is to improve the wiping performance by suppressing chatter even if the wiper blade is covered with a rubber cover, or the wiper blade is covered with a cover with rubber fins. It is to provide a wiper device.

A wiper device according to the present invention includes a wiper arm including an arm head having one end connected to a wiper shaft and an arm shank having a base end connected to the other end of the arm head;
A wiper blade provided with a connecting portion that is rotatably connected to a tip portion of the arm shank at an intermediate portion,
An arm cover that covers the tip of the arm shank is attached to the wiper arm,
The arm cover is integrally formed with a vibration suppressing portion that contacts the side wall of the connecting portion and a fixing portion that is fixed to the wiper arm.

  According to the above-described means, the vibration suppressing portion of the arm cover fixed to the wiper arm abuts against the side wall of the connecting portion of the wiper blade, so that chatter in the wiper blade can be suppressed. Not only the fin type wiper blade but also a wiper blade having a blade body covered with a rubber cover, chattering in the wiper blade can be suppressed and wiping performance can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the wiper device 10 according to the present embodiment includes a wiper arm 11, an arm cover 20, a wiper blade 30, and a blade cover 60.
The wiper arm 11 includes an arm head 12 fixed to one end of a wiper shaft (not shown), and the wiper shaft is reciprocally rotated by converting the rotational motion of the wiper motor into a reciprocating rotational motion via a link mechanism. As a result, the arm head 12 reciprocates within a certain range following the rotation of the wiper shaft.
A base end portion of an arm shank 13 formed in an elongated hook shape is pivotally supported at the distal end portion of the arm head 12 so as to be rotatable. The arm shank 13 is configured to rotate with respect to the arm head 12 in a plane including the wiper shaft. In other words, the arm shank 13 is configured to be able to approach and leave the glass surface of the window.
Although not shown, a spring is provided between the arm head 12 and the arm shank 13, and one end is engaged with the arm head 12 and the other end is engaged with the arm shank 13. The reaction force is applied to the arm shank 13 so as to constantly urge the arm shank 13 in a direction approaching the glass surface of the window.

As shown in FIGS. 2 and 3, a stepped portion 13a is formed at the tip of the arm shank 13, and an arm piece 15 constituting the tip of the arm shank 13 is formed on the stepped portion 13a. Fastened by rivets 14 and 14.
The arm piece 15 is formed in an elongated plate shape, and a hook 16 for connecting the wiper blade is formed in a U shape in the plate thickness direction at the distal end portion of the arm piece 15 opposite to the fastened proximal end portion. It is folded and formed. A lock hole 17 is formed at the end of the hook 16 on the folded side.
In the stepped portion 13a of the arm shank 13 to which the arm piece 15 is fastened, an engagement hole 18 for engaging with an arm cover 20 to be described later is formed at the base end side portion of the arm piece 15.

As shown in FIG. 1 and FIG. 4, an arm cover 20 made of resin is integrally formed on the main surface opposite to the window glass at the tip of the arm shank 13 with an arm piece 15 and a rivet 14. , 14 is covered.
The arm cover 20 includes a cover portion 21, and the cover portion 21 is integrally formed in a generally bowl shape corresponding to the substantially bowl shape of the arm shank 13. The cover portion 21 covers the stepped portion 13a formed at the tip of the arm shank 13 on three sides corresponding to the arm piece 15 and the rivets 14, that is, on the upper side of the arm piece 15 and on both sides thereof. It is put on.
By attaching the arm cover 20 to the stepped portion 13 a of the arm shank 13, the arm shank 13 and the arm cover 20 can be arranged in close proximity, so that the arm cover 20 has a sense of unity with the arm shank 13. be able to.
As shown in FIGS. 2, 4 (b) and 4 (c), a pair of engagement part pieces 22, 22 for retaining the inner part of the inner part of the cover-shaped inner surface of the cover part 21 are respectively provided. Projected in the direction. In a state where the arm cover 20 is put on the tip of the arm shank 13, both the engaging pieces 22, 22 are engaged with the edges on both sides in the intermediate part of the arm piece 15.
Further, on the substantially center line of the base end portion of the cover-shaped inner surface of the cover portion 21, a positioning engagement piece 23 projects at a right angle. In a state where the arm cover 20 is placed on the tip of the arm shank 13, the positioning engaging piece 23 is fitted into the engaging hole 18 formed in the arm shank 13.
Both the engaging part pieces 22, 22 for retaining are engaged with the edges on both sides of the arm piece 15, and the engaging part piece 23 for positioning is fitted into the engaging hole 18 of the arm shank 13, The arm cover 20 is firmly fixed to the distal end portion of the arm shank 13.

A hook cover portion 24 that covers the hook 16 is formed in a rectangular shape corresponding to the hook 16 at a portion facing the hook 16 in the cover portion 21, and a tip portion of the hook cover portion 24 is a U-shape of the hook 16. It has been folded to correspond to. In a state where the arm cover 20 is put on the tip of the arm shank 13, the hook cover portion 24 covers the hook 16 from the side opposite to the window glass side.
A pair of engaging pieces 25 are provided at both ends of the tip of the hook cover portion 24 so as to protrude laterally.
Further, the end side between the both engaging part pieces 25 of the hook cover part 24 constitutes a regulating end side 26 that can be brought into contact with a regulating part piece 65 described later.
A pair of escape portions 27 are formed on both sides of the hook cover portion 24 in the cover portion 21 by notching them. In a state where the arm cover 20 is put on the tip of the arm shank 13, both the escape portions 27, 27 are in a state where they escape from both sides of the hook 16.
A pair of chatter suppressing portions 28, 28 as vibration suppressing portions respectively contacting the outer surfaces of support walls 42, 42 of the connecting block 40 described later protrude at the portions of both escape portions 27, 27 in the cover portion 21. It is installed. Both chatter suppressing portions 28 and 28 are each formed in a circular dish shape that engages with both end portions of a rotating shaft 44 described later.

As shown in FIG. 5, the wiper blade 30 includes a blade body 31 that wipes the surface of the wind glass. The blade body 31 is formed in a substantially rod shape, has a length corresponding to the wiping portion of the wind glass to be wiped, and is configured to exhibit the flexibility to bend and follow the curved surface of the wind glass. Has been.
That is, the blade body 31 has a holding member 32 configured to exhibit flexibility, a blade rubber 33 held by the holding member 32, and a holding member 32 that covers the holding member 32 with the blade rubber 33 exposed. And a member cover 34. The blade body 31 urges the window glass to be pressed by a spring (not shown) stretched between the arm head 12 and the arm shank 13.

As shown in FIG. 5, the wiper blade 30 includes a connecting block 40 as a connecting portion that is rotatably connected to the distal end portion of the arm shank 13, and the connecting block 40 is in the longitudinal direction of the blade body 31. Arranged and fixed in the center of the. The external shape of the connecting block 40 corresponds to the external shape of the blade body 31 so as to create a sense of unity as the entire wiper blade 30.
As shown in FIGS. 2 and 5, an accommodation groove 41 for accommodating the lock member 46 is formed at the center of the connecting block 40, and a support wall 42 formed by a pair of side walls of the accommodation groove 41, A pair of support holes 43 and 43 are formed in 42. A rotation shaft 44 is inserted into both the support holes 43, 43 so as to be pivoted between the support walls 42, 42.
In practice, the pivot shaft 44 is insert-molded integrally with the connecting block 40 when the connecting block 40 is molded.
A pair of vertical grooves 45, 45 are laid opposite to each other on the inner surfaces of both support walls 42, 42.

The lock member 46 is integrally formed using a resin that exhibits elastic force, and is formed in a substantially H-shaped steel shape corresponding to the receiving groove 41. An insertion port 48 is formed at one end of the H-shaped steel-shaped horizontal piece 47 a, and a shaft portion 49 is formed adjacent to the insertion port 48. The outer peripheral surface in contact with the insertion port 48 of the shaft portion 49 is formed in a semi-cylindrical shape corresponding to the U-shaped inner peripheral surface of the hook 16 of the arm piece 15.
As shown in FIG. 2, a fitting port 50 is formed in a substantially R shape in a portion of the shaft portion 49 on the bottom surface side of the housing groove 41. When the connecting shaft 40 is formed in the fitting port 50, the rotation shaft 44 that is integrally molded is inserted, so that the lock member 46 rotates in the receiving groove 41 around the axis of the shaft portion 49. It will be in a state of being supported freely.
A lever 51 is provided on the bottom surface side of the receiving groove 41 of the horizontal piece 47 a of the lock member 46, and a fixed end thereof is connected to the shaft portion 49 so as to project. A shooting portion 52 is formed at the free end portion of the lever 51, and a lock convex portion 53 projects from the bottom side main surface of the housing groove 41 at the intermediate portion. The lock projection 53 is configured to fit into the lock hole 17 of the hook 16 of the arm piece 15.
A pair of protrusions 54, 54 protrude from both side surfaces of the lock member 46, and the protrusions 54, 54 are a pair of vertical grooves respectively recessed in the inner surfaces of the support walls 42, 42 of the connecting block 40. 45 and 45 are set to be engaged. Both protrusions 54, 54 engage with both longitudinal grooves 45, 45, thereby preventing the lock member 46 from rotating more than necessary with respect to the rotation shaft 44.
A pair of engaging recesses 55, 55 are respectively recessed at the side of the insertion port 48 side of the pair of H-shaped steel-shaped vertical pieces 47 b, 47 b of the lock member 46. The arm cover 20 is configured to be engaged with a pair of engaging pieces 25, 25 protruding from the hook cover portion 24 of the arm cover 20.

The wiper blade 30 is attached to the arm piece 15 which is the tip of the arm shank 13 as follows.
The hook 16 formed in a U-shape at the distal end portion of the arm piece 15 is inserted into the shaft portion 49 of the lock member 46 of the connecting block 40 from the insertion port 48 side. As the hook 16 is inserted into the shaft portion 49, the lever 51 is bent by its own elastic force, and when the hook 16 is inserted to the back, the lever 51 is restored by its own elastic force. When the lever 51 is restored, the lock projection 53 is fitted into the lock hole 17 of the hook 16. The hook 16 is locked to the connecting block 40 by the insertion of the lock projection 53 and the lock hole 17.
In the present embodiment, when the hook 16 is inserted into the shaft portion 49 of the lock member 46, both chatter suppressing portions 28, 28 of the arm cover 20 are connected to the connecting block 40 as shown in FIG. 6. The both ends of the rotation shaft 44 projecting from the outer surfaces of the support walls 42 and 42 are respectively fitted.

As described above, when the wiper blade 30 is connected to the tip of the arm shank 13, the wiper blade 30 is supported so as to be rotatable about the rotation shaft 44.
The rotation range of the wiper blade 30 is within the range of the inclination angle indicated by the imaginary line in FIG. 5B from the posture in which the lock member 46 is substantially parallel to the receiving groove 41 of the connecting block 40.
Further, the arm cover 20 fixed in advance to the distal end portion of the arm shank 13 is in a state of covering the main surface of the wiper blade 30 on the receiving groove 41 side of the connecting block 40. That is, the arm cover 20 is in a state where the connecting portion between the arm shank 13 and the wiper blade 30 is covered with a sense of unity without any gap.
Further, the engaging pieces 25, 25 projecting from the hook cover portion 24 of the arm cover 20 are engaged with the engaging recesses 55, 55 sunk on the end side of the lock member 46 on the insertion port 48 side. As a result, the hook cover portion 24 of the arm cover 20 is coupled to the lock member 46, so that it is prevented from being lifted from the lock member 46.
In the present embodiment, as shown in FIG. 6, both chatter suppressing portions 28, 28 of the arm cover 20 abut on the outer surfaces of both support walls 42, 42 of the connection block 40, respectively. 40 is gripped.

  A blade cover fixing portion 56 is formed at a portion of the connecting block 40 adjacent to the bottom surface of the housing groove 41, and an engagement hole 57 is formed in a substantially rectangular shape on the bottom surface of the blade cover fixing portion 56. A pair of engaging convex portions 58, 58 project inwardly on the pair of long side surfaces of the engaging hole 57, respectively, and at the center portion of the end surface of the engaging hole 57 on the receiving groove 41 side, A push-opening convex part 59 projects in the opposite direction.

As shown in FIGS. 2 and 7, the blade cover 60 is integrally formed in a substantially hood shape as shown in FIGS. 2 and 7, and the outer shape of the blade cover 60 is a streamlined shape in order to suppress air resistance. Is formed.
In order to create a continuity with the arm cover 20, the outer shape of the blade cover 60 corresponds to the outer shape of the arm cover 20 as shown in FIG. 1.

An escape portion 61 for escaping the hook cover 24 is largely cut out in a substantially square shape at the end of the blade cover 60 on the connection side with the arm cover 20, and the blade cover 60 is connected to the wiper blade 30. In the state attached to 40, the escape portion 61 is fitted so as to escape the hook cover portion 24.
A pair of relief portions 62 and 62 are formed on the pair of side walls of the blade cover 60, respectively, and anti-slip portions 63 and 63 are formed at portions near the tips of the relief portions 62 and 62, respectively. In a state where the blade cover 60 is attached to the connecting block 40 of the wiper blade 30, both escape portions 62, 62 are in a state where the both chatter suppressing portions 28, 28 covering both ends of the rotating shaft 44 are respectively escaped. .

A pair of engaging part pieces 64 and 64 project from a substantially central part of the inner surface of the blade cover 60, and a lower engaging projection 64a and an upper engaging part are provided on each of the engaging part pieces 64 and 64, respectively. A mating protrusion 64b is provided. Both the engaging part pieces 64, 64 are inserted into a pair of engaging convex parts 58, 58 protruding from the engaging hole 57 of the connecting block 40 from the opposite side to the receiving groove 41, and engage with each other. At the same time, the lower engaging projections 64a and 64a and the upper engaging projections 64b and 64b of both the engaging piece pieces 64 and 64 are configured to grip both engaging convex portions 58 and 58.
When both the engaging pieces 64 and 64 engage with both engaging protrusions 58 and 58, the engaging portions 64 and 64 project between the engaging holes 57 and the central portion of the end surface of the engaging hole 57 on the receiving groove 41 side. Since the provided push-out convex part 59 is in a fitted state, the engagement of both the engaging part pieces 64 and 64 with both the engaging convex parts 58 and 58 is maintained.
As a result, the blade cover 60 is put on the wiper blade 30 in a state where the blade cover 60 is prevented from falling off the connecting block 40.

By the way, when the wiper blade 30 is removed from the tip of the arm shank 13 during the maintenance and inspection work of the wiper blade 30, it is necessary to remove the blade cover 60 from the connection block 40.
In such a case, when the both anti-slip portions 63 and 63 of the blade cover 60 are pushed (inwardly pressed) and the anti-slip portions 63 and 63 are pushed in the opposite direction to the arm cover 20, 60 can be removed from the connecting block 40.
In other words, when both the anti-slip portions 63, 63 of the blade cover 60 are pushed inward, the gap between the engaging portions 64, 64 is opened, so that the anti-slip portions 63, 63 are placed in the opposite direction to the arm cover 20. By pushing, it is possible to release the engagement of the engagement portions 64 and 64 with the engagement protrusions 58 and 58.

A restricting piece 65 projects from the upper end of the engaging pieces 64, 64 inside the blade cover 60 in the direction of the hook cover 24.
Here, FIG. 8 shows the positional relationship between the restriction end side 26 of the hook cover portion 24 and the restriction portion piece 65 of the blade cover 60.
As shown in FIG. 8A, in a state where the blade cover 60 is attached to the connecting block 40 of the wiper blade 30, the regulating portion piece 65 is spaced from the regulating end side 26 of the hook cover portion 24 by a predetermined distance. Are facing each other.
Then, when the wiper arm 11 and the wiper blade 30 are relatively rotated around the rotation shaft 45 from the posture in which the lock member 46 is accommodated in the accommodation groove 41 of the connection block 40, FIG. 8B shows. As described above, when the restriction end side 26 of the hook cover portion 24 abuts against the restriction portion piece 65 of the blade cover 60, the rotation range of the wiper blade 30 is restricted to a predetermined range.
At this time, in the engagement hole 57 of the connection block 40, the pair of engagement protrusions 58, 58 and the push-open protrusion 59 are the lower engagement protrusions 64 a of the pair of engagement portion pieces 64, 64 of the blade cover 60. 64a and the upper engaging protrusions 64b and 64b, the rotational load applied to the blade cover 60 is received by the connecting block 40 via the upper engaging protrusions 64b and 64b. .

  According to the embodiment, the following effects can be obtained.

(1) By holding the wiper blade connecting block by the chatter suppression portion of the arm cover fixed to the wiper arm, even if the wiper blade is covered with a rubber cover on the blade body, chatter is suppressed and abnormal noise is generated. Therefore, the wiping performance of the wiper device can be improved.

(2) By separately connecting the arm cover and the blade cover to the connecting portion between the wiper arm and the wiper blade, it is possible to effectively cover the gap between the wiper arm and the wiper blade, and to prevent dirt and snow from clogging the gap. Therefore, the appearance performance and wiping performance of the wiper device can be improved.

(3) By projecting a regulating piece on the part of the regulating edge of the blade cover that faces the hook cover, when the lock member is rotated from the position in which the lock member is received in the receiving groove of the connecting block, Since the regulation end side and the regulation piece can be brought into contact with each other, the rotation range of the wiper blade can be regulated to a predetermined range.

(4) An engaging piece is provided on the hook cover portion of the arm cover, and the engaging concave portion is submerged in the lock member of the connecting block, whereby the arm is engaged with the engaging concave piece and the engaging concave portion. Since the hook cover portion of the cover can be coupled to the lock member, the arm cover can be prevented from being lifted from the lock member, that is, the connecting block.

(5) A pair of engaging pieces projecting from the inside of the blade cover and a pair of engaging projections projecting into the engaging holes of the connecting block, thereby engaging both engaging pieces. The blade cover can be put on the connecting block of the wiper blade by the engagement with the convex portion in a state in which the blade cover is prevented from falling off. In addition, when performing a maintenance / inspection operation of the wiper blade, the blade cover can be removed from the connecting block by forcibly releasing the engagement between both the engagement piece and the both engagement protrusions.

  The present invention is not limited to a wiper device having a wiper blade having a blade body covered with a rubber cover as in the above embodiment, but a wiper device having a tournament type wiper blade or a fin type wiper. The present invention can be applied to wiper devices in general such as a wiper device having a blade.

  In addition, the structure of the connecting portion between the arm shank and the wiper blade is not limited to the connection structure of the U-shaped hook and the lock member pivotally mounted on the connecting block, and other clip methods. The connecting structure of can be applied.

  Further, the wiper device according to the present invention is not limited to the one arranged on the driver's seat side, but can be applied to the one arranged on the passenger seat side. In this case, the specifications of the left and right orientations of the wiper device are appropriately different according to the arrangement.

It is a front view which shows the wiper apparatus which is one embodiment of this invention. It is a disassembled perspective view which shows the principal part. The main part of an arm shank is shown, (a) is a front view, (b) is a side view. The attachment state of an arm cover is shown, (a) is a front view, (b) is a side sectional view, and (c) is a rear view. The wiper blade is shown, (a) is a side view, (b) is a side view of a connection part, (c) is the front view, (d) is sectional drawing which follows the dd line of (b). . The connection state to the connection part of a wiper arm is shown, (a) is a partially abbreviated front view, (b) is sectional drawing which follows the bb line of (a). The blade cover is shown, (a) is a front view, (b) is a plan view, (c) is a left side view thereof, (d) is a right side view thereof, (e) is a rear view, and (f) is a rear view thereof. It is sectional drawing which follows the ff line | wire of (a). It is each partially abbreviate | omitted front sectional drawing which shows the positional relationship of the control edge of a hook cover part, and the control part piece of a blade cover, (a) has shown the free state, (b) has shown the control state. Yes.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 11 ... Wiper arm, 12 ... Arm head, 13 ... Arm shank, 14 ... Rivet, 15 ... Arm piece, 16 ... Hook, 17 ... Lock hole, 18 ... Engagement hole, 20 ... Arm cover, 21 ... Cover part, 22 ... engagement part piece for retaining, 23 ... engagement part piece for positioning, 24 ... hook cover part, 25 ... engagement part piece, 26 ... regulating end side, 27 ... relief part, 28 ... Chatter suppressing part (vibration suppressing part), 30 ... wiper blade, 31 ... blade body, 32 ... holding member, 33 ... blade rubber, 34 ... holding member cover, 40 ... connecting block (connecting part), 41 ... receiving groove, 42 ... support wall, 43 ... support hole, 44 ... rotating shaft, 45 ... vertical groove, 46 ... lock member, 47a ... horizontal piece, 47b ... vertical piece, 48 ... insertion port, 49 ... shaft, 50 ... insertion Mouth, 51 ... Lever, 52 ... Shooting , 53 ... Lock convex part, 54 ... Projection, 55 ... Engagement concave part, 56 ... Blade cover fixing part, 57 ... Engagement hole, 58 ... Engagement convex part, 59 ... Push-opening convex part, 60 ... Blade cover, 61 ... Escape portion, 62 ... Escape portion, 63 ... Anti-slip portion, 64 ... Engagement piece, 64a ... Lower engagement projection, 64b ... Upper engagement projection, 65 ... Restriction piece.

Claims (5)

A wiper arm comprising an arm head having one end connected to the wiper shaft and an arm shank having a base end connected to the other end of the arm head;
A wiper blade provided with a connecting portion that is rotatably connected to a tip portion of the arm shank at an intermediate portion,
An arm cover that covers the tip of the arm shank is attached to the wiper arm,
The wiper device according to claim 1, wherein the arm cover is integrally formed with a vibration suppressing portion that contacts the side wall of the connecting portion and a fixing portion that is fixed to the wiper arm.   2. The wiper device according to claim 1, wherein the vibration suppression unit is formed in a substantially circular dish shape that engages with both ends of a rotation shaft protruding from the connection unit.   The wiper device according to claim 1, wherein the fixing portion is engaged with an engagement hole formed in the arm shank.   The tip of the arm shank has a U-shaped hook, and an inner peripheral surface of the hook is engaged with an outer peripheral surface of a lock member constituting the connecting portion. The wiper device according to 2 or 3.   The wiper device according to claim 1, 2, 3, or 4, wherein the wiper blade is covered with a blade cover that covers a tip portion of the arm shank.

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