JP2019073291A - Wiper arm - Google Patents

Abstract

To provide a wiper arm which enables opening/closing operation of a head cover by rotation while achieving improvement of rigidity of an arm head.SOLUTION: In a wiper arm 2 including an arm shank 40, an arm head 10, and a head cover 60, the head cover 60 is attached to the arm head 10 so as to be rotatable in a state where a rotation center P2, which is located closer to the arm shank 40 side than a rotation center P1 of the arm shank 40 and the arm head 10, is set as a supporting point.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a wiper arm of a wiper device mounted on a vehicle.

  A wiper device for wiping windshield glass (front window glass or rear window glass) of an automobile is provided with a wiper arm having a wiper blade at its tip end for wiping a glass wiping surface. The base end of the wiper arm is fixed to a pivot shaft provided on the vehicle body, so that the wiper arm reciprocates in a predetermined range by the rotation of the pivot shaft, whereby raindrops, mud, etc. Play the role of wiping away.

  For example, Patent Document 1 discloses an example of a conventional wiper arm.

  Generally, as described in Patent Document 1, the wiper arm is a proximal arm head (also referred to as a support) fixed to the pivot shaft and a distal arm shank (also referred to as a retainer) to which the wiper blade is attached. And have. The arm head and the arm shank are rotatably connected by the connecting means.

  The proximal end side of the arm head is provided with a pivot shaft fixing portion fixed to the pivot shaft using a nut. Further, a pair of side plates are provided in a bifurcated shape on the tip end side of the arm head, with a recess for receiving a connection projection piece protruding from the base end of the arm shank. The connection protrusion on the arm shank side is provided with, for example, a connection hole in which a part of the hole circumferential wall is opened. On the other hand, between the pair of side plates on the arm head side, for example, a connecting shaft is provided corresponding to the connecting hole. And, by engaging the connecting shaft on the arm head side with the connecting hole on the arm shank side, the arm shank is connected to the arm head so as to be rotatable in a direction toward and away from the glass surface. . Here, the connecting hole and the connecting shaft constitute connecting means for rotatably connecting the arm head and the arm shank.

  In addition, between the arm shank and the arm head, a tension coil spring having one end engaged with the arm shank and the other end engaged with the arm head is interposed. The tension coil spring serves as biasing means for biasing the arm shank pivotably connected to the arm head in a direction approaching the glass wiping surface.

  As described above, the arm head is fixed to the pivot shaft by inserting the pivot shaft into the insertion hole provided in the pivot shaft fixing portion of the arm head and tightening the nut on the tip of the pivot shaft. If the fastening portion is exposed as it is to the outside, it may not only impair the appearance but also be exposed to raindrops and dust. Therefore, a generally bowl-shaped head cover is usually attached to the arm head so as to cover the arm head.

  The head cover has a portion on the opposite arm shank side (a portion covering the pivot shaft fixing portion and the nut) by being rotatably attached to the arm head at a portion close to the arm shank side, for example, in consideration of maintenance. It can be opened and closed vertically. In other words, by turning the head cover open by turning, the fastening portion of the nut can be exposed, and the necessary operation can be performed on the exposed portion.

  As described above, in order to rotatably mount the head cover, the arm head and the head cover are provided with engaging means serving as a pivot. For example, a shaft hole or a protruding shaft is provided on the outer surface of a pair of side plates of the arm head, and a protruding shaft or a shaft hole is provided on the inner surface of the head cover. By engaging the head cover, the head cover is rotatably coupled to the arm head.

  By the way, conventionally, the arm head is mainly configured by a synthetic resin molded product. Therefore, for processing reasons, the connecting shaft for connecting with the arm shank is integrally formed on the inner side surface of the pair of side plates, and at the position corresponding to the connecting shaft on the inner side surface of the outer side surface of the pair of side plates The rotation center of the head cover (shaft hole or projecting shaft serving as a rotation fulcrum) is provided.

  On the other hand, there has been a demand for changing the arm head from a synthetic resin molded article to a metal-processed article (for example, an aluminum die-cast article) mainly in consideration of the rigidity increase of the wiper arm. When the arm head is formed of a metal workpiece, it is mainly considered that only the connection holes are formed in the pair of side plates of the arm head due to processing restrictions. That is, it is mainly to adopt a method of rotatably connecting the arm head and the arm shank by penetrating and riveting a rivet as a connecting shaft in the connecting hole of the arm head and the connecting hole on the arm shank side. Conceivable.

JP 2005-193786 A

  However, when the arm head and the arm shank are connected by rivets, the head of the rivet is exposed to the outer surface of the pair of side plates of the arm head. Then, it becomes difficult to provide the center of rotation of the head cover at the position where the rivets are provided. Therefore, it has been concluded that attaching the head cover to the arm head so as to be able to pivot can not but give up when forming the arm head with a metal work to increase the rigidity.

  The present invention has been made in view of the above-described circumstances, and provides a wiper arm that enables opening and closing operations of a head cover by rotation while aiming to increase the rigidity of the arm head.

  In order to solve the above problems, a wiper arm according to the present invention comprises an arm shank connected to a wiper blade, an arm head rotatably connected to the arm shank, and one end attached to the arm head. An urging means having the other end attached to the arm shank and urging the arm shank in the rotational direction with respect to the arm head to generate a pressure on the wiper blade against the surface to be wiped And a head cover that covers the arm head, wherein the head cover is pivotable about a rotation center located closer to the arm shank than the pivot center of the arm shank and the arm head. It is characterized in that it is mounted on the arm head.

  According to the present invention, the center of rotation of the head cover can be moved to the arm shank side. Therefore, at the time of work such as maintenance, the head cover can be opened and closed by pivoting without completely removing the head cover. In addition, the head cover can be widely opened, and the operability at the time of maintenance and the like can be improved.

  In the above-mentioned wiper arm, the arm head is characterized by being formed of a metal processing product.

According to the present invention, since the arm head is formed of a metal product (for example, aluminum die cast), the rigidity of the arm head which is the base part of the wiper arm can be increased. Further, by using a metal processed product, the arm head can be miniaturized and its non-deformability can be improved. Therefore, it can contribute to the prevention of the occurrence of the operation failure due to the secular change and the like. It is possible to enable the opening and closing operation of the head cover by turning while configuring the arm head with a metal product. Therefore, at the time of work such as maintenance, the work such as maintenance can be performed on the fastening portion between the arm head and the pivot shaft without completely removing the head cover, and the workability can be improved.
That is, in the case where the arm head is formed of a metal processed product, the connection at the rotation center of the arm head and the arm shank is performed by a rivet due to processing restrictions and the like. When connecting with a rivet, the head of the rivet will be exposed on the outer surface of the arm head, so provide a turning center for opening and closing the head cover at the turning center of the arm head and arm shank. It becomes difficult. Therefore, in the present invention, the opening / closing operation by turning the head cover is enabled by providing the turning center of the head cover at a position not disturbed by the rivet, that is, at a position different from the turning centers of the arm head and the arm shank. .

  In the wiper arm, the center of rotation of the head cover is disposed in the vicinity of a corner portion of the arm head on the arm shank side and at a position separated from the surface to be wiped.

  According to the present invention, by increasing the rigidity of the arm head formed of a metal processing product, the center of rotation of the head cover can be disposed in the vicinity of the corner portion of the arm head without undue strain. There is. Therefore, when the head cover is rotated, the facing area of the inner surface of the head cover relative to the outer surface of the arm head can be reduced, and the rotation operability can be improved even when the facing surface slides. .

  In the wiper arm, the rotation center of the head cover is disposed in the vicinity of a corner of the head cover on the arm shank side and at a position separated from the surface to be wiped.

  According to the present invention, since the head cover pivots around the corner of the head cover, interference with the arm shank when the head cover is opened can be easily avoided. Therefore, the shape can be simplified without providing a stopper or the like for avoiding the interference with the arm shank.

  In the wiper arm, an engagement recess is provided on either one of the inner surface of the head cover and the outer surface of the arm head, and an engagement protrusion is provided on the other, and the engagement recess is engaged with the engagement protrusion. The rotation center of the head cover is configured by the above.

  According to the present invention, since the arm head and the head cover are rotatably connected by the engagement of the engagement convex portion and the engagement concave portion, the configuration can be simplified.

  In the wiper arm, the engagement recess is provided on the inner side surface of the head cover made of a synthetic resin molded product, and the engagement protrusion is provided on the outer side surface of the arm head made of a metal product. The center of rotation of the head cover is configured by the engagement with the joint convex portion.

  According to the present invention, since it is not necessary to provide the engagement convex portion on the head cover made of synthetic resin, the moldability is improved.

  According to the present invention, the rigidity of the arm head can be increased, and the head cover can be opened and closed by rotation.

It is the perspective view seen from the lower part which shows a partial structure of the wiper apparatus using the wiper arm which concerns on embodiment of this invention. It is an enlarged view which shows the principal part of FIG. 1 in the state which removed the head cover. It is the perspective view seen from the top of the part shown in FIG. It is a figure which decomposes | disassembles and shows a part of part shown in FIG. It is a single block diagram seen from the lower part of the arm head shown in FIG. 3, (a) is a perspective view showing a state before attaching a rivet and a spring pin, (b) is a perspective view showing a state where a rivet and a spring pin are attached FIG. It is the top view seen from the top of the part shown in FIG.2 and FIG.3. It is the top view seen from the lower part of the part shown in FIG. FIG. 3 is an enlarged view of the portion shown in FIG. 2 with the head cover attached. It is a side view which shows the state which rotated the head cover shown in FIG. 8 upwards.

Hereinafter, embodiments of the present invention will be described based on the drawings.
FIG. 1 is a perspective view showing a partial configuration of a wiper apparatus using a wiper arm according to an embodiment of the present invention, and FIG. 2 is an enlarged view showing the main part of FIG. 1 with the head cover removed. FIG. 3 is a perspective view from above of the part shown in FIG.

(Wiper device)
As shown in FIG. 1, the wiper apparatus 1 includes a wiper arm 2 according to the present embodiment in which a wiper blade 3 for wiping a glass wiping surface (surface to be wiped) (not shown) is attached to a tip portion. The base end of the wiper arm 2 is fixed to the pivot shaft 5 provided on the vehicle body, so that the wiper arm 2 reciprocates in a predetermined range by the rotation of the pivot shaft 5. It plays a role of removing dirt and mud.

(Directivity of the wiper arm)
Here, the directionality will be briefly described in advance.
In the following description, the longitudinal direction of the wiper arm 2 along the glass wiping surface is referred to as X direction, the width direction of the wiper arm 2 along the glass wiping surface is referred to as Y direction, and the height direction of the wiper arm perpendicular to the glass wiping surface is referred to as Z direction. . The X, Y, Z directions are directions orthogonal to one another.

  Further, the arm shank side (tip end side) in the longitudinal direction of the wiper arm 2, that is, the X direction is taken as the X1 direction, and the arm head side (base end side) as the X2 direction. When the X2 direction is viewed from the X1 direction, the left side of the wiper arm 2 in the width direction Y direction is taken as the Y1 direction, and the right side is taken as the Y2 direction. Further, the upper side (the direction separating from the glass wiping surface) in the height direction of the wiper arm 2, that is, the Z direction, is the Z1 direction, and the lower side (the direction approaching the glass wiping surface) is the Z2 direction.

(Wiper arm configuration)
As also shown in FIGS. 2 and 3, the wiper arm 2 is mounted with an arm head (also referred to as a support) 10 which is a base component on the base end side (X2 direction side) fixed to the pivot shaft 5 and a wiper blade 3 And an arm shank (also referred to as a retainer) 40 on the tip end side (X1 direction side). The arm shank 40 is formed of a synthetic resin injection-molded product, and the arm head 10 is formed of an aluminum die-cast processed product (metal processed product). And the arm head 10 and the arm shank 40 which were separately manufactured are rotatably connected by the connection means (connection holes 43 and 22, the rivet 30, and the bush 31) mentioned later.

(Arm head)
A pivot shaft fixing portion 11 fixed to the pivot shaft 5 using a nut (see FIG. 9) is provided on the base end side (X2 direction side) of the arm head 10 which is an integral die-cast product made of aluminum die cast There is. The pivot shaft fixing portion 11 is a flange-like portion whose upper surface is a fastening seat of a nut, and an insertion hole 12 penetrating in the Z direction in which the tip of the pivot shaft 5 is inserted is provided at the center.

  4 is an exploded view of a part of the portion shown in FIG. 3, FIG. 5 is a single block diagram seen from below the arm head shown in FIG. 3, (a) is a rivet or spring pin (B) is a perspective view showing a rivet and a spring pin attached state, FIG. 6 is a plan view seen from above the portion shown in FIG. 2 and FIG. 7, FIG. 6 is a bottom view of the portion shown in FIG. 6, FIG. 8 is an enlarged view of the portion shown in FIG. 2 with the head cover attached, and FIG. 9 shows the head cover shown in FIG. It is a side view which shows the state made to rotate.

  As shown in FIGS. 4 to 7, a pair of side plates is provided on the tip end side (X1 direction side) of the arm head 10 with a recess 21 for receiving the connection projection 42 provided at the base end of the arm shank 40. 20, 20 are provided in a bifurcated shape. The pair of side plates 20 are provided in parallel to each other along the XZ plane, and are opposed to each other across the recess 21 in the width direction (Y direction) of the wiper arm 2.

(Arm shank)
The connecting projection 42 on the arm shank 40 side is integrally formed as a plate-like portion having a width of about half the width of the main body 41 at the center in the width direction of the base end face of the main body 41 of the arm shank 40 . The connecting protrusion 42 is also provided along the XZ plane, and a connecting hole 43 (a hole into which the rivet 30 is inserted in FIG. 4) penetrates in the Y direction at the center of the side surface of the connecting protrusion 42. Is drilled. Further, as shown in FIGS. 1 and 7, a groove 44 for avoiding interference with a tension coil spring 90 described later is formed along the X direction on the lower surface in the Z2 direction of the connecting projection piece 42.

(Connection of arm head and arm shank)
On the other hand, in the pair of side plates 20 of the arm head 10, as shown in FIGS. 4 and 5, connection holes 22 penetrating in the Y direction are bored corresponding to the connection holes 43 on the arm shank 40 side. ing. The arm head 10 and the arm shank 40, as shown in FIGS. 3 to 7, insert the connecting projection 42 into the recess 21 between the pair of side plates 20, 20, and position the connecting holes 22, 43 of each other. In the combined state, the rivet 30 is penetrated through the connection holes 22 and 43 via the bush 31 and crimped. Thereby, it is rotatably connected in a direction (up and down direction, that is, Z direction) in the XZ plane, that is, in a direction toward and away from the glass surface.
Here, the connection holes 22 and 43, the rivet 30 and the bush 31 constitute a connection means for rotatably connecting the arm head 10 and the arm shank 40, and the center of the rivet 30 is the arm shank relative to the arm head 10. The rotational center P1 of 40 (see FIG. 9).

(Tensile coil spring)
Further, on the lower surface side between the arm shank 40 and the arm head 10, a tension coil spring 90 as biasing means is interposed. As shown in FIG. 1, the main part of the tension coil spring 90 is accommodated in the inner space of the main body portion 41 of the arm shank formed in an inverted U-shaped cross-sectional shape. In the tension coil spring 90, one end 91 in the X2 direction is locked to a spring pin 32 (see FIG. 4) provided as a locking portion on the arm head 10 side, and the other end 92 is on the arm shank 40 side. It is locked by the locking portion. Thereby, the tension coil spring 90 biases the arm shank 40 rotatably connected to the arm head 10 in the direction (Z2 direction) approaching the glass wiping surface.

(Locking part of tension coil spring)
As shown in FIGS. 5A and 5B, the spring pin 32 provided as a locking portion on the arm head 10 side is bored in the projecting portion 26 on the inner side of the side plate 20 of the arm head 10. It is fixed to the arm head 10 by press-fitting into the pin insertion hole 27. The spring pin 32 is disposed at a position on the opposite side of the arm shank 40 than the rivet 30, that is, at a position on the pivot shaft fixing portion 11 side.

(Mechanism of generation of urging force)
Thus, the locking portions at both ends of the tension coil spring 90 are disposed on both sides of the pivoting center (the rivet 30) of the arm head 10 and the arm shank 40, and the tension coil spring 90 is on the lower side of the rivet 30. By being disposed in a tension state, a biasing force is generated which rotationally biases the arm shank 40 in a direction (Z2 direction) approaching the glass wiping surface.

(Need for head cover)
By the way, for fixing the arm head 10 to the pivot shaft 5, the tip of the pivot shaft 5 is inserted through the insertion hole 12 provided in the pivot shaft fixing portion 11 of the arm head 10, and It is done by tightening the If the fastening portion is exposed as it is to the outside, it may not only impair the appearance but also be exposed to raindrops and dust. Therefore, as shown in FIGS. 1, 3 and 8, the arm head 10 is attached with a head cover 60 made of a substantially bowl-shaped synthetic resin so as to cover the arm head 10.

(Necessity of turning the head cover)
As shown in FIG. 9, the head cover 60 has a portion on the side opposite to the arm shank 40 (pivot shaft) by being rotatably attached to the arm head 10 in a portion close to the arm shank 40 in consideration of maintenance. The fixing portion 11 and the portion covering the nut can be operated to open and close in the vertical direction. That is, by setting the head cover 60 in the state of being opened upward by rotation (the state shown by the solid line in FIG. 9), the fastening portion of the nut 6 can be exposed, and the necessary operation can be performed on the exposed portion It has become.

(Details of the head cover)
Hereinafter, this point will be described in detail.
As shown in FIGS. 2 to 4, the head cover 60 is made of a synthetic resin injection-molded product, and has a bowl shape that covers the upper portion of the arm head 10. That is, the head cover 60 has an upper surface plate 61 in the Z1 direction, a pair of side plates 62 and 62 in the Y1 and Y2 directions, and a rear surface plate 63 in the form of a semicircular arc in the X2 direction. The front surface on the (X1 direction side) and the lower surface on the Z2 direction side are in the shape of an open bowl.

  The top plate 61 is provided with a notch 64 in a U-shape from the front end edge to avoid interference with the connection projection 42 of the arm shank 40. In the vicinity of the upper corner on the side of the arm shank 40 on the inner surface of the side plates 62, 62 of the head cover 60, a boss 65 with a pair of hinge holes 66 is provided in a protruding manner.

  Further, a pair of stopper protrusions 67 is provided in the vicinity of the lower corner portion on the side of the arm shank 40 on the inner side surface of the side plates 62, 62 of the head cover 60. Further, an engagement convex portion 68 for engaging with the arm head 10 is formed at the lower end portion on the opposite side of the arm shank 40 in the inner side surface of the both side plates 62, 62 of the head cover 60. In addition, reinforcing ribs 69 are provided on portions from the inner surface of the upper surface plate 61 of the head cover 60 to the inner surfaces of the side plates 62 and 62 and the rear surface plate 63.

(Configuration corresponding to the head cover on the arm head side)
On the other hand, the arm head 10 is provided with several elements as means for attaching the head cover 60 and using it at the time of rotation.

(The center of rotation of the head cover)
First, as the first element, a hinge hole of the boss 65 with the hinge hole 66 on the head cover 60 side in the vicinity of the upper corner on the arm shank 40 side on each outer side surface of the pair of side plates 20 of the arm head 10 A pair of hinge projections (engagement convex portions) 25 engaged with the (engagement concave portions) 66 are provided in a protruding manner.
The position at which the hinge projections 25 are disposed is a position different from the position of the rivet 30 (rotation center P1) that rotatably connects the arm shank 40 and the arm head 10, and the rivet 30 (turning) It is a position closer to the arm shank 40 side than the movement center P1).

  Then, by engaging the pair of hinge holes 66 on the side of the head cover 60 with the pair of hinge protrusions 25 on the side of the arm head 10, the head cover 60 makes the arm head 10 a hinge projection 25 and the hinge hole 66 a rotation center P2 ( As shown in FIG. 9), they are rotatably connected in the vertical direction.

Thus, by mounting the head cover 60 on the arm head 10, as shown in FIG. 9, the rotation center P2 of the head cover 60 is a portion on the arm shank 40 side of the arm head 10 and the head cover 60 and It is located in the vicinity of the corner located at a position away from the wiping surface (surface to be wiped).
Therefore, the head cover 60 can be exposed so as to be able to maintain the pivot shaft fixing portion 11 side of the arm head 10 by lifting the portion on the opposite arm shank 40 side.

(Configuration to hold the head cover in the open position)
Next, as a second element, when the head cover 60 is rotated about 90 degrees upward (Z2 direction) as shown in FIG. 9 at a predetermined location on the outer surface of the pair of side plates 20 of the arm head 10 The pair of stopper projections 67 on the head cover 60 side are engaged. Thus, a pair of holding holes 28 for holding the head cover 60 in the open state (inverted posture) is provided. The pair of holding holes 28 is arranged at a position corresponding to the position of the stopper projection 67 on the head cover 60 side when the head cover 60 is rotated about 90 degrees upward (Z2 direction).

(Configuration to hold the head cover in the closed position)
Further, as the third element, when the head cover 60 is closed, the engagement convex portion 68 on the head cover 60 side is engaged with the lower end edges on both left and right sides of the pivot shaft fixing portion 11 of the arm head 10. An engagement recess 15 is provided to hold the head cover 60 in the closed position.
In addition, in the predetermined places on the left and right outer side surfaces of the arm head 10, depressions 29 for avoiding interference with the head cover 60 are provided.

(Wiper arm assembly procedure)
Next, the procedure for assembling the wiper arm 2 will be briefly described.
In order to assemble the wiper arm 2, first, the spring pin 32 serving as the locking portion of the one end portion 91 of the tension coil spring 90 is press-fit into the pin insertion hole 27 of the arm head 10 made of a metal product. Next, the connection projection 42 at the base end of the arm shank 40 is inserted into the recess 21 between the pair of side plates 20, 20 of the arm head 10, and the connection hole 43 on the arm shank 40 side and the connection on the arm head 10 side. Align holes 22.

  In this state, the rivets 30 are inserted into the connection holes 22, 22 of the pair of side plates 20, 20 of the arm head 10 from both sides. At this time, the rivet 30 is inserted through the bush 31 into the connection hole 43 of the connection projection 42 on the side of the arm shank 40 located between the pair of side plates 20 of the arm head 10. By doing this, the arm head 10 and the arm shank 40 are rotatably connected with the rivet 30 as the rotation center P1.

  Next, one end 91 of the tension coil spring 90 is locked to the spring pin 32 of the arm head 10, and the other end 92 of the tension coil spring 90 is locked to the locking portion of the arm shank 40. As a result, a biasing force in the Z2 direction is generated in the arm shank 40.

  Next, the hinge hole 66 of the boss portion 65 with the hinge hole 66 of the head cover 60 is engaged with the hinge projection 25 of the arm head 10. Thus, the head cover 60 is mounted on the arm head 10 so as to be rotatable in the vertical direction with the hinge hole 66 and the hinge projection 25 as the rotation center P2. After that, the head cover 60 is pivoted to the closed position, and the engagement convex portion 68 on the head cover 60 side is engaged with the engagement concave portion 15 on the arm head 10 side. Thus, the head cover 60 can be held in the closed state (the state shown in FIG. 8 or the state shown by the two-dot chain line in FIG. 9).

(Action)
When the wiper arm 2 is fixed to the pivot shaft 5 (or when the fixed position is maintained after fixing), engagement between the engagement recess 15 on the arm head 10 side and the engagement projection 68 on the head cover 60 side While removing the head cover 60 on the side opposite to the arm shank 40 in the Z1 direction. Then, the head cover 60 pivots upward with the hinge hole 66 and the hinge projection 25 as the pivot center P2, and the pivot shaft fixing portion 11 is exposed. At this time, the stopper projection 67 on the head cover 60 side is engaged with the holding hole 28 on the arm head 10 side, whereby the head cover 60 is held in the inverted state. Therefore, the work on the periphery of the pivot shaft fixing portion 11 can be easily performed without completely removing the head cover 60.

(Summary of effects and effects)
As described above, according to the wiper arm 2 of the present embodiment, since the arm head 10 is formed of a metal-processed product (aluminum die casting), the rigidity of the arm head 10 which is a base component of the wiper arm 2 can be increased. it can. Further, by using a metal processed product, the arm head 10 can be miniaturized and its non-deformability can be improved. Therefore, it can contribute to the prevention of the occurrence of operation failure due to aging or the like.

  Further, since the rotation center P2 of the head cover 60 is provided at a position different from the rotation center P1 of the arm head 10 and the arm shank 49, the head cover by rotation while constituting the arm head 10 by a metal product 60 opening and closing operations can be made possible. Therefore, at the time of work such as maintenance, work such as maintenance can be performed on the fastening portion between the arm head 10 and the pivot shaft 5 without completely removing the head cover 60, and the workability can be improved.

  That is, when the arm head 10 is formed of a metal-processed product, the rivet 30 is used to connect the arm head 10 and the arm shank 40 at the rotation center P1 due to processing restrictions and the like. When the connection is performed with the rivet 30, the head of the rivet 30 is exposed on the outer surface of the arm head 10. Therefore, in order to open and close the head cover 60 at the rotation center position of the arm head 10 and the arm shank 40. It is not possible to provide the rotation center P2 of the In that respect, in the wiper arm 2 of the present embodiment, the head cover 60 is provided with the rotation center P2 of the head cover 60 at a position not disturbed by the rivets 30, that is, a position different from the rotation centers P1 of the arm head 10 and the arm shank 40. Opening and closing operation by turning of 60 became possible.

  In particular, since the center of rotation P2 of the head cover 60 is moved to the arm shank 40 side from the position where the arm head 10 is formed of a synthetic resin molded product, the head cover 60 can be widely opened. The improvement of the work efficiency of Further, by setting the rotation center to P1, the area of the rotation locus in which the end on the arm shank 40 side of the head cover 60 projects toward the arm shank 40 can be made smaller than the rotation center P2. Therefore, the clearance between the head cover 60 and the arm shank 40 can be reduced in order to avoid contact between the head cover 60 and the arm shank 40 at the time of rotation. Further, the arm head 10 can be miniaturized, and the appearance of the wiper arm 2 can be improved.

  In addition, by increasing the rigidity of the arm head 10 formed of a metal product, the rotation center P2 of the head cover 60 can be disposed in the vicinity of the upper corner portion of the arm head 10 without undue force. Therefore, when the head cover 60 is rotated, the facing area of the inner surface of the head cover 60 and the outer surface of the arm head 10 to be moved relative to each other can be reduced. Can be enhanced.

  In addition, since the head cover 60 pivots around the upper corner portion of itself, interference with the arm shank 40 when the head cover 60 is opened can be easily avoided. Therefore, the shape can be simplified without providing a stopper or the like for avoiding the interference with the arm shank 40.

  Further, in the present embodiment, since the arm head 10 and the head cover 60 are rotatably connected by the engagement of the hinge projection (engagement convex portion) 25 and the hinge hole (engagement concave portion) 66, the configuration is simplified. Can be In particular, by providing the hinge projection (engaging projection) 25 on the arm head 10 side, the head cover 60 made of synthetic resin does not have to be provided with the engagement projection, and the formability is improved.

The present invention is not limited to the above-described embodiment, and includes the above-described embodiment with various modifications, without departing from the spirit of the present invention.
For example, the hinge protrusion (engagement convex portion) in the above embodiment may be provided on the head cover 60 side, and the hinge hole (engagement concave portion) may be provided on the arm head side.

  DESCRIPTION OF SYMBOLS 1 ... Wiper apparatus 2 ... Wiper arm 3 ... Wiper blade 5 ... Pivot axis 6 ... Nut 10 ... Arm head 25 ... Hinge projection (engagement convex part) 40 ... Arm shank 60 ... Head cover 66 ... Hinge hole (engagement recessed part) 90 ... Tensile coil spring (biasing member) 91 ... one end 92 ... other end P1 ... center of rotation of arm shank and arm head P2 ... center of rotation of head cover

Claims (6)

An arm shank coupled to the wiper blade;
An arm head rotatably connected to the arm shank;
One end is attached to the arm head, and the other end is attached to the arm shank, and the arm shank is biased in the rotational direction with respect to the arm head, and the wiper blade is moved to the wiping surface Biasing means for generating a pressing force of
A head cover that covers the arm head;
In a wiper arm provided with
The head cover is rotatably mounted on the arm head with a rotation center located closer to the arm shank than the arm shank and the rotation center of the arm head.
Wiper arm characterized by. The arm head is made of a metal processing product.
A wiper arm according to claim 1, characterized in that. The center of rotation of the head cover is disposed on the arm shank side of the arm head and in the vicinity of a corner at a position separated from the surface to be wiped.
The wiper arm according to claim 1 or 2, characterized in that: The center of rotation of the head cover is disposed near the corner on the arm shank side of the head cover and at a position separated from the surface to be wiped.
A wiper arm according to claim 3, characterized in that. An engagement recess is provided on one of the inner surface of the head cover and the outer surface of the arm head, and an engagement protrusion is provided on the other, and the head cover is engaged by the engagement of the engagement recess and the engagement protrusion. Configured the rotation center of the
The wiper arm according to any one of claims 1 to 4, characterized in that. The engagement concave portion is provided on the inner side surface of the head cover made of a synthetic resin molded product, and the engagement convex portion is provided on the outer side surface of an arm head made of a metal product. The center of rotation of the head cover by the engagement of
The wiper arm according to claim 5, characterized in that:

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