JP6489988B2 - Wiper arm - Google Patents

Description

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

  A wiper device for wiping a windshield glass (front window glass or rear window glass) of an automobile includes a wiper arm having a wiper blade attached to a distal end portion for wiping a glass wiping surface. The wiper arm is fixed to a pivot shaft provided on the vehicle body so that the wiper arm reciprocates within a predetermined range by the rotation of the pivot shaft, thereby removing raindrops and mud on the glass wiping surface with the wiper blade. Plays the role of dispelling.

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

  Usually, as described in Patent Document 1, the wiper arm includes a proximal-side arm head (also called a support) fixed to a pivot shaft and a distal-side arm shank (also called a retainer) to which a wiper blade is attached. And. Then, the arm head and the arm shank are rotatably connected by a connecting means.

  A pivot shaft fixing portion that is fixed to the pivot shaft using a nut is provided on the base end side of the arm head. In addition, a pair of side plates are provided in a bifurcated manner on the distal end side of the arm head, with a recess for receiving a connecting projecting piece projecting from the proximal end of the arm shank. For example, a connecting hole in which a part of the hole peripheral wall is opened is provided in the connecting protrusion on the arm shank side. 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. The arm shank is connected to the arm head so as to be rotatable in a direction approaching and separating from the glass surface by engaging the connecting shaft on the arm head side and the connecting hole on the arm shank side. . Here, the connecting hole and the connecting shaft constitute connecting means for rotatably connecting the arm head and the arm shank.

  Further, a tension coil spring having one end locked to the arm shank and the other end locked to the arm head is interposed between the arm shank and the arm head. The tension coil spring serves as a biasing means that biases the arm shank rotatably 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 at the tip of the pivot shaft. If this fastening portion is exposed to the outside as it is, not only the beauty is impaired, but there is a risk of being exposed to raindrops or dust. Therefore, a generally saddle-shaped head cover is usually attached to the arm head so as to cover the arm head.

  For this head cover, for example, in consideration of maintenance, a portion close to the arm shank side is rotatably attached to the arm head, so that the portion on the side opposite to the arm shank (the portion covering the pivot shaft fixing portion and the nut) It can be opened and closed in the vertical direction. That is, when the head cover is opened upward by rotation, the fastening portion of the nut is exposed and necessary work 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 rotation fulcrum. For example, a shaft hole portion or a projecting shaft portion is provided on the outer surface of the pair of side plates of the arm head, and a projecting shaft portion or a shaft hole portion is provided on the inner surface of the head cover, and the shaft hole portion and the projecting shaft portion are connected to each other. By being engaged, the head cover is configured to be connected to the arm head so as to be rotatable.

  Conventionally, the arm head is mainly composed of a synthetic resin molded product. Therefore, for processing reasons, a connecting shaft for connecting with the arm shank is integrally formed on the inner side surfaces of the pair of side plates, and the outer side surfaces of the pair of side plates are positioned at positions corresponding to the connecting shafts on the inner side surface side. The center of rotation of the head cover (a shaft hole portion or a protruding shaft portion serving as a rotation fulcrum) is provided.

  On the other hand, there has been a demand to change the arm head from a synthetic resin molded product to a metal processed product (for example, an aluminum die-cast product) mainly considering an increase in rigidity of the wiper arm. When an arm head is formed of a metal workpiece, it is conceivable that only a connection hole is formed in the pair of side plates of the arm head due to processing limitations. In other words, the arm head and the arm shank are mainly connected in a pivotable manner by inserting and crimping a rivet as a connecting shaft into 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 rivet heads are exposed on the outer surfaces of the pair of side plates of the arm head. If it does so, it will become difficult to provide the rotation center of a head cover in the position which provided the rivet. For this reason, it has been concluded that when the arm head is formed of a metal processed product for increasing the rigidity, it is unavoidable to attach the head cover to the arm head in a rotatable manner.

  The present invention has been made in view of the above-described circumstances, and provides a wiper arm that enables a head cover to be opened and closed by turning while increasing the rigidity of the arm head.

  In order to solve the above problems, a wiper arm according to the present invention includes 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. The other end of the arm shank is attached to the arm shank. The biasing means biases the arm shank against the arm head in the rotational direction and generates a pressing force on the wiped surface on the wiper blade. And a head cover that covers the arm head, wherein the arm head is made of a metal processed product, and the arm shank side of the head cover is separated from the arm shank and the center of rotation of the arm head. It is characterized in that the arm head is mounted so as to be rotatable with a rotation center disposed at the position of the center as a fulcrum.

According to the present invention, since the arm head is made of a metal processed product (for example, aluminum die cast), the rigidity of the arm head that is the base part of the wiper arm can be increased. In addition, since it is made of a metal workpiece, the arm head can be reduced in size and improved in non-deformability. For this reason, it is possible to contribute to the prevention of malfunction due to aging.
In addition, since the center of rotation of the head cover is provided at a position different from the center of rotation of the arm head and arm shank, it is possible to open and close the head cover by pivoting while the arm head is made of a metal workpiece. can do. Therefore, during maintenance work, 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 workability can be improved.
That is, when the arm head is made of a metal processed product, the connection between the arm head and the arm shank at the rotation center is performed by a rivet due to processing restrictions and the like. When connecting with rivets, the head of the rivet will be exposed on the outer surface of the arm head. Therefore, a center of rotation for opening and closing the head cover is provided at the position of the center of rotation of the arm head and arm shank. It becomes difficult. Therefore, in the present invention, by providing the center of rotation of the head cover at a position not disturbed by the rivet, that is, a position different from the center of rotation of the arm head and the arm shank, opening / closing operation by rotation of the head cover is enabled. .

  In the wiper arm, the center of rotation of the head cover is disposed on the arm shank side with respect to the center of rotation of the arm shank and the arm head.

  According to the present invention, the rotation center of the head cover can be moved to the arm shank side as compared with the case where the arm head is formed of a synthetic resin molded product. Therefore, the head cover can be opened widely, and the workability during maintenance can be improved.

  The wiper arm is characterized in that the center of rotation of the head cover is disposed in the vicinity of a corner of the arm head on the arm shank side and at a position away from the surface to be wiped.

  According to the present invention, the rigidity of the arm head made of a metal workpiece is increased, so that the center of rotation of the head cover can be arranged near the corner of the arm head without excessive force. Yes. Therefore, when the head cover is rotated, the facing area of the inner surface of the head cover and the outer surface of the arm head that are relatively moved can be reduced, and the rotating operability can be improved even when the facing surface slides. .

  The wiper arm is characterized in that the center of rotation 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 away from the surface to be wiped.

  According to the present invention, since the head cover rotates around the corner of the head cover, it is easy to avoid interference with the arm shank when the head cover is opened. Therefore, a simple shape can be obtained without intentionally providing a stopper or the like for avoiding interference with the arm shank.

  In the wiper arm, an engagement concave portion is provided on one of the inner side surface of the head cover and the outer side surface of the arm head and an engagement convex portion is provided on the other side, and the engagement concave portion and the engagement convex portion are engaged. The center of rotation of the head cover is configured as described above.

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

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

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

  According to the present invention, it is possible to increase the rigidity of the arm head and to open and close the head cover by turning.

It is the perspective view seen from the bottom which shows the 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 part shown in FIG. It is a figure which decomposes | disassembles and shows a part of part shown in FIG. 4A is a perspective view showing a state before a rivet or a spring pin is attached, and FIG. 4B is a perspective view showing a state where a rivet or a spring pin is attached. FIG. FIG. It is the top view seen from the part shown in FIG.2 and FIG.3. It is the top view seen from the part shown in FIG. FIG. 3 is an enlarged view showing a portion shown in FIG. 2 with a 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 with reference to the drawings.
FIG. 1 is a perspective view showing a partial configuration of a wiper device using a wiper arm according to an embodiment of the present invention as viewed from below, and FIG. 2 is an enlarged view showing a main part of FIG. 1 with a head cover removed. FIG. 3 is a perspective view of the portion shown in FIG. 2 as viewed from above.

(Wiper device)
As shown in FIG. 1, the wiper apparatus 1 includes a wiper arm 2 according to this 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 wiper arm 2 is fixed to a pivot shaft 5 provided on the vehicle body so that the wiper arm 2 is reciprocated within a predetermined range by the rotation of the pivot shaft 5, whereby raindrops on the glass wiping surface are wiped by the wiper blade 3. It plays the role of wiping away dirt and mud.

(Direction of 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 the X direction, the width direction of the wiper arm 2 along the glass wiping surface is referred to as the Y direction, and the height direction of the wiper arm perpendicular to the glass wiping surface is referred to as the Z direction. . The X, Y, and Z directions are directions orthogonal to each other.

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

(Configuration of wiper arm)
As shown in FIGS. 2 and 3, the wiper arm 2 is attached to an arm head (also referred to as a support) 10 that is a base part (X2 direction side) base part 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 side (X1 direction side). The arm shank 40 is composed of a synthetic resin injection-molded product, and the arm head 10 is composed of an aluminum die-cast processed product (metal processed product). The separately manufactured arm head 10 and arm shank 40 are rotatably connected by connecting means (connecting holes 43 and 22, rivets 30, and bush 31) described later.

(Arm head)
A pivot shaft fixing portion 11 that is 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 that is an integrally processed product made of aluminum die cast. Yes. The pivot shaft fixing portion 11 is a flange-shaped portion whose upper surface is a fastening seat of a nut, and an insertion hole 12 penetrating in the Z direction into which the tip of the pivot shaft 5 is inserted is provided at the center.

  FIG. 4 is an exploded view of a part of the portion shown in FIG. 3, FIG. 5 is a single unit view seen from below the arm head shown in FIG. 3, and (a) shows rivets and spring pins. FIG. 6 is a perspective view showing a state before attaching, FIG. 6B is a perspective view showing a state where rivets and spring pins are attached, FIG. 6 is a plan view seen from above the parts shown in FIGS. FIG. 8 is a plan view of the portion shown in FIG. 6 as viewed from below, 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 rotated.

  As shown in FIGS. 4 to 7, a pair of side plates is disposed on the distal end side (X1 direction side) of the arm head 10 with a recess 21 for receiving a connecting projection 42 projecting from the proximal end of the arm shank 40. 20 and 20 are provided in a bifurcated shape. The pair of side plates 20 and 20 are provided in parallel to each other along the XZ plane, and face 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 about half the width of the main body 41 at the center in the width direction of the base end surface of the main body 41 of the arm shank 40. . This connection protrusion 42 is also provided along the XZ plane, and a connection hole 43 (a hole into which the rivet 30 is inserted in FIG. 4) penetrating in the Y direction is formed at the center of the side surface of the connection protrusion 42. Is drilled. As shown in FIGS. 1 and 7, a groove 44 for avoiding interference with a later-described tension coil spring 90 is formed along the X direction on the lower surface in the Z2 direction of the connecting projection piece 42.

(Connection between arm head and arm shank)
On the other hand, as shown in FIGS. 4 and 5, the pair of side plates 20, 20 of the arm head 10 is provided with a connecting hole 22 penetrating in the Y direction so as to correspond to the connecting hole 43 on the arm shank 40 side. ing. As shown in FIGS. 3 to 7, the arm head 10 and the arm shank 40 are configured such that the connecting protrusions 42 are inserted into the recesses 21 between the pair of side plates 20 and 20, and the connecting holes 22 and 43 are positioned relative to each other. In the combined state, the rivet 30 is passed through the connecting holes 22 and 43 through the bush 31 and crimped. Thereby, it connects so that it can rotate in the direction (up-down direction, ie, Z direction) which approaches and separates with respect to the XZ plane, ie, a glass surface.
Here, the connecting holes 22, 43, the rivet 30 and the bush 31 constitute a connecting means for rotatably connecting the arm head 10 and the arm shank 40, and the center of the rivet 30 is the arm shank for the arm head 10. 40 rotation centers P1 (see FIG. 9).

(Tension coil spring)
Further, a tension coil spring 90 as an urging means is interposed on the lower surface side between the arm shank 40 and the arm head 10. As shown in FIG. 1, the main part of the tension coil spring 90 is accommodated in the inner space of the main body 41 of the arm shank formed in an inverted U-shaped cross section. 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. Locked to the locking portion. Thereby, the tension coil spring 90 urges the arm shank 40 that is rotatably connected to the arm head 10 in the direction approaching the glass wiping surface (Z2 direction).

(Locking part of tension coil spring)
The spring pin 32 provided as a locking portion on the side of the arm head 10 is drilled in the protruding portion 26 inside the side plates 20 of the arm head 10 as shown in FIGS. 5 (a) and 5 (b). By being press-fitted into the pin insertion hole 27, the arm head 10 is fixed. The spring pin 32 is disposed at a position on the side opposite to the arm shank 40 from the rivet 30, that is, a position on the pivot shaft fixing portion 11 side.

(Mechanism of generating urging force)
Thus, the engaging portions at both ends of the tension coil spring 90 are arranged on both sides of the pivot center (rivet 30) of the arm head 10 and the arm shank 40, and the tension coil spring 90 is located below the rivet 30. By being arranged in a tensioned state, an urging force for rotating and urging the arm shank 40 in the direction approaching the glass wiping surface (Z2 direction) is generated.

(Necessity of head cover)
By the way, the arm head 10 is fixed to the pivot shaft 5 by inserting the tip of the pivot shaft 5 through the insertion hole 12 provided in the pivot shaft fixing portion 11 of the arm head 10 and the nut 6 (FIG. 9) at the tip of the pivot shaft 5. This is done by tightening If this fastening portion is exposed to the outside as it is, not only the beauty is impaired, but there is a risk of being exposed to raindrops or dust. Therefore, as shown in FIGS. 1, 3, and 8, the arm head 10 is mounted with a substantially saddle-shaped synthetic resin head cover 60 so as to cover the arm head 10.

(Necessity of rotating the head cover)
As shown in FIG. 9, in consideration of maintenance, the head cover 60 is rotatably mounted on the arm head 10 at a portion close to the arm shank 40 side, so that a portion on the anti-arm shank 40 side (pivot shaft) is provided. The fixing part 11 and the portion covering the nut) can be opened and closed in the vertical direction. In other words, by turning the head cover 60 upward (the state indicated by the solid line in FIG. 9) by turning, the fastening portion of the nut 6 can be exposed and necessary work 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 covering the top of the arm head 10. That is, the head cover 60 includes an upper surface plate 61 in the Z1 direction, a pair of side surface plates 62 and 62 in the Y1 direction and the Y2 direction, and a rear surface plate 63 having a semicircular arc surface shape in the X2 direction. The front surface of the (X1 direction side) and the lower surface of the Z2 direction side have an open bowl shape.

  The upper surface plate 61 is provided with a notch 64 in a U-shape from the front end edge to avoid interference with the connecting projection piece 42 of the arm shank 40. A boss portion 65 with a pair of hinge holes 66 protrudes in the vicinity of the upper corner portion on the arm shank 40 side on the inner side surfaces of both side plates 62, 62 of the head cover 60.

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

(Head cover rotation center)
First, as a first element, in the vicinity of the upper corner portion on the arm shank 40 side on each outer side surface of the pair of side plates 20 of the arm head 10, the hinge hole of the boss portion 65 with the hinge hole 66 on the head cover 60 side is provided. A pair of hinge projections (engagement projections) 25 that are engaged with the (engagement depressions) 66 project.
The positions at which the hinge protrusions 25 are arranged are 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 time). The position is closer to the arm shank 40 side than the moving center P1).

  Then, the pair of hinge holes 66 on the head cover 60 side is engaged with the pair of hinge protrusions 25 on the arm head 10 side, so that the head cover 60 moves the hinge protrusion 25 and the hinge hole 66 to the rotation center P2 ( As shown in FIG. 9, it is connected so as to be rotatable in the vertical direction.

As shown in FIG. 9, when the head cover 60 is attached to the arm head 10, the rotation center P2 of the head cover 60 is a portion of the arm head 10 and the head cover 60 on the arm shank 40 side and glass. 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 expose the pivot shaft fixing portion 11 side of the arm head 10 so as to be maintainable by lifting the portion on the side opposite to the arm shank 40.

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

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

(Wiper arm assembly procedure)
Next, a procedure for assembling the wiper arm 2 will be briefly described.
In order to assemble the wiper arm 2, first, the spring pin 32 that is a locking portion of the one end 91 of the tension coil spring 90 is press-fitted into the pin insertion hole 27 of the arm head 10 made of a metal processed product. Next, the connecting projection piece 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 connecting hole 43 on the arm shank 40 side is connected to the arm head 10 side. The holes 22 are aligned.

  In this state, the rivets 30 are inserted into the connection holes 22 and 22 of the pair of side plates 20 and 20 of the arm head 10 from both outsides. At that time, the rivet 30 is inserted into the connecting hole 43 of the connecting protrusion 42 on the arm shank 40 side located between the pair of side plates 20, 20 of the arm head 10 through the bush 31. By doing so, 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. By doing so, an urging force in the Z2 direction is generated in the arm shank 40.

  Next, the hinge hole 66 of the boss 65 with the hinge hole 66 of the head cover 60 is engaged with the hinge protrusion 25 of the arm head 10. Thereby, the head cover 60 is attached to 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. Thereafter, the head cover 60 is rotated 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. Accordingly, the head cover 60 can be held in a closed state (the state shown in FIG. 8 or the state shown by the two-dot chain line in FIG. 9).

(Function)
When the wiper arm 2 is fixed to the pivot shaft 5 (or when the fixing portion is maintained after fixing), the engagement concave portion 15 on the arm head 10 side and the engagement convex portion 68 on the head cover 60 side are engaged. While removing, the part of the head cover 60 on the side opposite to the arm shank 40 is lifted in the Z1 direction. Then, the head cover 60 rotates upward with the hinge hole 66 and the hinge projection 25 as the rotation 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 an inverted state. Therefore, the work around the pivot shaft fixing portion 11 can be easily performed without completely removing the head cover 60.

(Summary of effects)
As described above, according to the wiper arm 2 of the present embodiment, since the arm head 10 is made of a metal processed product (aluminum die-cast), the rigidity of the arm head 10 that is a base part of the wiper arm 2 can be increased. it can. In addition, the arm head 10 can be reduced in size and improved in non-deformability due to the metal workpiece. For this reason, it is possible to contribute to the prevention of malfunction due to aging.

  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 arm cover 10 is made of a metal processed product, and the head cover is rotated. 60 opening / closing operations can be made possible. For this reason, during maintenance work or the like, maintenance work or the like 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 workability can be improved.

  That is, when the arm head 10 is made of a metal workpiece, the rivet 30 connects the arm head 10 and the arm shank 40 at the rotation center P1 due to processing restrictions. When the rivet 30 is connected, the head of the rivet 30 is exposed on the outer surface of the arm head 10, so that the head cover 60 can be opened / closed at the center of rotation of the arm head 10 and the arm shank 40. The rotation center P2 cannot be provided. In that respect, in the wiper arm 2 of the present embodiment, by providing the rotation center P2 of the head cover 60 at a position not disturbed by the rivet 30, that is, a position different from the rotation center P1 of the arm head 10 and the arm shank 40, Opening and closing operation by 60 rotations became possible.

  In particular, since the rotation center P2 of the head cover 60 is moved to the arm shank 40 side rather than the position when the arm head 10 is formed of a synthetic resin molded product, the head cover 60 can be opened widely, for maintenance, etc. The workability can be improved. Furthermore, by setting the pivot center to P1, the area of the pivot locus where the end of the head cover 60 on the arm shank 40 side projects to the arm shank 40 side can be made smaller than the pivot center P2. Therefore, the clearance between the head cover 60 and the arm shank 40 for avoiding contact between the head cover 60 and the arm shank 40 during rotation can be reduced. In addition, the arm head 10 can be downsized and the appearance of the wiper arm 10 can be improved.

  Further, since the rigidity of the arm head 10 made of a metal processed product is improved, the rotation center P2 of the head cover 60 can be disposed in the vicinity of the upper corner of the arm head 10 without excessive strength. Therefore, when the head cover 60 is rotated, the opposed area of the inner surface of the head cover 60 and the outer surface of the arm head 10 that are relatively moved can be reduced. Can be increased.

  Further, since the head cover 60 rotates around the vicinity of the upper corner of the head cover 60, it becomes easy to avoid interference with the arm shank 40 when the head cover 60 is opened. Therefore, a simple shape can be obtained without intentionally providing a stopper or the like for avoiding interference with the arm shank 40.

  In the present embodiment, the arm head 10 and the head cover 60 are rotatably connected by the engagement of the hinge protrusion (engagement protrusion) 25 and the hinge hole (engagement recess) 66, so that the configuration is simplified. Can be achieved. In particular, by providing the hinge projection (engagement convex portion) 25 on the arm head 10 side, it is not necessary to provide the engagement convex portion on the head cover 60 made of synthetic resin, so that the moldability is improved.

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

  DESCRIPTION OF SYMBOLS 1 ... Wiper apparatus 2 ... Wiper arm 3 ... Wiper blade 5 ... Pivot shaft 6 ... Nut 10 ... Arm head 25 ... Hinge protrusion (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 ... rotation center of arm shank and arm head P2 ... rotation center of head cover

Claims (6)

An arm shank connected to the wiper blade;
An arm head rotatably connected to the arm shank;
One end portion is attached to the arm head, and the other end portion is attached to the arm shank. An urging means for generating a pressing force of
A head cover covering the arm head;
In the wiper arm with
The arm head is made of a metal processed product,
The arm shank side of the head cover is attached to the arm head so as to be rotatable about a rotation center disposed at a position different from the rotation center of the arm shank and the arm head.
A wiper arm characterized by that. The center of rotation of the head cover is disposed closer to the arm shank than the center of rotation of the arm shank and the arm head.
The wiper arm according to claim 1. 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 located at a position away from the surface to be wiped.
The wiper arm according to claim 2. The center of rotation 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 away from the surface to be wiped.
The wiper arm according to claim 3. An engagement concave portion is provided on one of the inner side surface of the head cover and the outer side surface of the arm head, and an engagement convex portion is provided on the other side. The engagement of the engagement concave portion and the engagement convex portion results in the head cover. The rotation center of
The wiper arm according to any one of claims 1 to 4, wherein the wiper arm is 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 the arm head made of the metal processed product. The engagement concave portion and the engagement convex portion The rotation center of the head cover is configured by engagement with
The wiper arm according to claim 5.

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