JP2002002455A - Cover body for arm head in wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate disturbance caused by a cover body, when a wiper arm engaged with the cover body is attached to a wiper shaft. SOLUTION: The cover body 11 and an arm head 3 are constituted to engage a cover body locking protrusion 11e with an arm head locking recess 3f so as to hold an open attitude, when a cover body engaging boss 11d is engaged with an arm head engaging part 3e, when a tip part of the cover body 11 is constituted to be freely oscillatable vertically using the engaging part 3e as a fulcrum, and when the cover body 11 is oscillated vertically to be brought into the open attitude where a tip part side is positioned on the upper side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a cover body of an arm head in a wiper device for wiping a window surface of a vehicle such as a passenger car, a bus and a truck.

[0002]

2. Description of the Related Art Generally, in such a wiper device,
There is a configuration in which the wiper arm is assembled by penetrating a wiper shaft protruding from the body side at the base end of the arm head constituting the wiper arm, and tightening a nut to the penetrating distal end. In such a case, the arm head may be covered with a cover so as to prevent the nut fastening portion from being exposed to the outside. For example, Japanese Patent Application Laid-Open No. Sho 58-180352 discloses this. Have been. In this case, the cover body is configured to swing up and down with the engagement portion at the tip of the arm head as a fulcrum, whereby the cover body is moved from the covering position covering the base end of the arm head to the upper side of the base end of the arm head. Until the open position is released, the shape can be swung freely.
Also, in recent years, there is a wiper arm formed of a resin material in terms of weight reduction and design, and such a wiper arm is provided with aerodynamic and aesthetically superior properties by forming the entire wiper arm in a streamlined shape. Although it is possible to provide such a structure, the above-described cover body is provided with a similar configuration.

[0003]

By the way, the cover body is surely mounted in a retaining shape with the covering posture, but freely swings in other postures. . On the other hand, the wiper arm is shipped with the cover body attached to the arm head in the free swinging state, and is attached to the wiper shaft on the skeleton side. This mounting operation is performed by tightening a nut to the tip of the wiper shaft. Since the nut is tightened from just above the wiper shaft using a tool such as an impact wrench, for example, the wiper shaft penetrates. It is necessary to open the upper part of the wiper arm base end where the section is provided. However, as described above, the conventional cover body is in a free swing state in which the cover body simply swings around the engagement portion as a fulcrum.
Furthermore, since a wiper arm made of a resin material as described above has a streamlined design, a large force acts to swing the cover body in the open state toward the covering posture side, so that it becomes easier to fall down. I have. For this reason, at the time of the fastening work, the cover body becomes an obstacle, and it is necessary to perform the work while pressing down the cover body, and there is a problem that workability is impaired and a smooth fastening work cannot be performed. There is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made for the purpose of solving these problems. A base end of the present invention is attached to a wiper shaft via a fixing means. A cover body attached to a fixed arm head, wherein the cover body covers a base end portion of the arm head with an engaging portion provided at a tip end portion of the arm head as a swing fulcrum; In order to be able to swing freely to the open position in which the upper end is opened, a holding means for holding the open position of the cover is provided between the cover and the arm head. By doing so, the work of assembling the wiper arm and the wiper shaft can be performed while holding the cover body. In this case, the holding means of the present invention may be a locking projection and a locking recess formed between the cover body and the arm head. Further in this one,
The locking between the locking projection and the locking recess of the present invention can be released with a load smaller than the engagement at the arm head engaging portion. Further, in this case, a locking projection is formed on the cover body of the present invention, and a locking recess is formed on the arm head, and the locking recess of the arm head is provided with a swing deformation of the cover body. A guide concave portion for guiding the movement of the locking projection can be extended. Further, in this embodiment, the guide concave portion of the present invention is a guide concave groove having a concave shape, and a plurality of the guide concave grooves are formed in a state substantially along the same arc locus as the swing locus of the engaging projection. It is provided in a state following the shape, and the locking projection can be locked in a temporary fixing shape. By doing so, it is possible to prevent the cover body from covering the arm head and causing difficulties when transforming the cover body into the open position again. Further, since the cover body can be temporarily fixed at any position, the assembling work can be improved.

[0005]

FIG. 1 shows an embodiment of the present invention.
Explanation will be made based on the drawings shown in FIGS. In the drawing,
Reference numeral 1 denotes a wiper arm that constitutes a wiper device. The wiper arm 1 includes an arm head 3 that is integrally fixed to a wiper shaft (pivot shaft) 2 that is rotatably supported on the frame side as described later. An arm shank 4 whose base end is swingably connected to the arm head 3. The wiper arm 1 reciprocates and swings with the forward and reverse rotation of the wiper shaft 2. The wiper blade 5 swingably connected to the tip of the arm shank 4 is set to perform the wiping operation of the window surface, and the basic configuration thereof is the same as the conventional one.

The arm head 3 is formed integrally with a resin material, and a through hole 3a is formed at the base end of the arm head 3. The through hole 3a extends vertically, and a metal support is formed in the through hole 3a. The member 6 is fitted in a detent shape. The support member 6 is formed with a shaft hole 6a extending in the vertical direction, through which the wiper shaft 2 supported on the skeleton side is made to penetrate, and a penetrating tip of the wiper shaft 2 projecting upward from the shaft hole 6a. The wiper shaft 2 and the arm head 3 are set so that they can be integrally mounted by tightening the nut 7 on the nut 2a. At this time, the nut 7 is tightened to the support member 6 and made of resin. The tightening load of the nut 7 does not act on the arm head 3, and the arm head 3 is thereby reinforced. Further, a pair of support pieces 3b are formed at the tip of the arm head 3 in a state of branching in the circumferential direction of the through hole 3a, and the arm shank 4 is swingable between the tips of the support pieces 3b. The support shaft 3c is integrally formed with the support shaft 3c, and a chamfered portion 3d is formed on the outer peripheral surface on the base end side of the support shaft 3c. Further, a projectile receiving shaft 9 for supporting one end of a biasing projectile 8, which will be described later, is integrally attached to the base end side of the support piece 3b.

On the other hand, the arm shank 4 is
It has been integrally molded with resin material like
A blade mounting portion 4a for mounting a wiper blade is formed on the lower surface of the distal end portion, and the machine receiving shaft 1 is formed on the lower surface on the proximal side.
0 is integrally attached. Further, a narrow connecting portion 4c protruding toward the arm head 3 is integrally formed at a base end of the arm shank 4, and a concave hole 4d formed in a protruding end of the connecting portion 4c is formed in the arm. By externally fitting the arm shank 4 to the head support shaft 3c, the arm shank 4 is
It is set so as to be vertically swingable with respect to. Incidentally, the arm shank concave hole 4d and the arm head 3c support shaft can be connected by incorporating one side of the opening of the arm shank concave hole 4d into the chamfered portion 3d of the arm head support shaft 3c. I have. An urging spring 8 is interposed between the arm receiving shaft 10 on the arm shank 4 side and the arm receiving shaft 9 on the arm head 3 side. It is set so as to swing up and down with the arm head support shaft 3c as a fulcrum against the armature 8 and to change from an action posture in which it comes into contact with the window surface in a resilient manner to an upright posture in which the arm head 3 stands. The arm shank 4 is set in the operating posture, and the wiper shaft 2 is driven forward and reverse to perform the wiping operation of the window surface.

Reference numeral 11 denotes a cover mounted on the arm head 3. The cover 11 is made of a resin material and is integrally formed so as to be thin and elastically deformable. A ceiling surface portion 11a to cover and a peripheral portion 11b to cover the peripheral surface of the arm head 3 are formed. A concave portion 11c for allowing the arm shank connecting portion 4c to swing up and down is formed in the ceiling surface portion 11a on the distal end side (arm shank 4 side), and a convex portion is formed on the distal end side of the opposing side surfaces of the peripheral edge portion 11b. The engagement bosses 11d are formed so as to protrude in a state of facing inward. The cover body 11 covers the outer peripheral surface of the arm head 3 tightly by engaging the engaging boss 11d with the deep groove-shaped engaging portions 3e formed on both side surfaces on the distal end side of the arm head 3. The cover body 11 with the covering posture and the engagement boss 11d as a fulcrum.
Of the arm head 3 is swung upward.
It is set so that it can be swingably deformed between an open position in which the upper part of the base end portion, which is the connection portion with the opening position, is opened.

[0009] Further, the peripheral portion 11b of the cover body 11 is located on the lower edge side from the position where the engaging boss 11d is formed and on the distal end side than the engaging boss 11d.
Spherical locking protrusions 11e having a smaller protrusion amount than 1d are formed so as to protrude inwardly. On the other hand, the cover body 11
When the cover is in the open position, a locking recess 3f is formed so that the locking protrusion 11e can be engaged and disengaged. The cover body 11 is in the open position and the locking protrusion 11e is fitted to the locking recess 3f. The cover body 11 is set so as to be able to be held in the open posture by being engaged, and this corresponds to the holding means in the open posture of the present invention. Further, guide recess grooves (guide recesses of the present invention) 12 extend on both side surfaces on the distal end side of the arm head 3 adjacent to the locking recesses 3f. The guide groove 12 is formed so that the guide groove 12 is opposed to the lock protrusion 11e which is displaced by the deformation swing between the open posture and the cover posture of the cover body 11 with the engagement boss 11d as a fulcrum. The groove end 12a is adjacent to the locking recess 3f with a slight arm head side surface 3g, and the other groove end 12b is formed at the lower end of the arm head. It is formed to reach. Further, the groove shape of the guide groove 12 is such that an inclined surface 12c that gradually becomes a deep groove is formed at one groove end 12a, and a deep groove is formed from the outer diameter inclined surface 12c to the other groove end 12b. The groove depth in the deep groove portion is set to be substantially the same as the protrusion amount of the locking protrusion 11e. Further, the locking recess 3f
While the inclined surface 3h is formed on the groove peripheral surface reaching the groove bottom surface, the locking protrusion 11e is formed in a hemispherical shape and has a smaller protrusion amount than the engagement boss 11d. Further, the other groove end 12 of the guide concave groove 12 of the arm head 3
In the vicinity of b, a chamfered portion 13 is formed.
When 1 is in the open position, the inclined surface 11g formed on the tip end side of the cover body 11 is configured not to interfere with the arm head 3.

Then, the cover body 11 is elastically deformed so as to push and expand the peripheral edge of the cover body 11 so that the engaging boss 11d is engaged with the arm head engaging portion 3e.
The wiper arm 1 with the cover body 11 mounted in this manner is mounted on the wiper shaft 2, and is attached to the penetrating tip 2 a of the wiper shaft 2. The screwing operation of the nut 7 is performed using the jig J. In this case, the cover body 11 is swung upward so that the locking protrusion 11 e is guided through the guide groove 12. The cover body 11 can be held in the open position in which the upper portion of the base end of the arm head 3 is opened as described above. At this time, the hemispherical locking projection 11e is temporarily separated from the guide groove 12 by a slight arm head side surface portion 3 via the inclined surface 12c of the guide groove 12.
After being pulled out into the locking recess 3f, the locking projection 3e is configured to be immersed in the locking recess 3f, whereby the locking projection 11e is set to be prevented from being removed from the locking recess 3f. Here, when the cover body 11 is in the open posture, the arm head chamfered portion 13 and the cover body inclined surface 11g are opposed to each other. As in the case where the chamfered portion 13 is not formed, there is no possibility that a force in the direction of falling the cover body 11 in the open posture toward the covering posture acts.
The engagement projection 11e and the engagement recess 3f are set so that the engagement and retention can be maintained more reliably and easily.

On the other hand, when the screwing operation of the nut 7 is completed and the cover body 11 is set to the covering posture in which the cover body 11 is attached to the arm head 3 in a close contact state, the base end of the cover body 11 is strongly directed downward. In this case, the locking projection 11
e has a smaller protrusion amount than the engagement boss 11d and is formed in a hemispherical projection, so that the engagement between the engagement projection 11e and the engagement recess 3f is made by the engagement boss 11d and the engagement portion 3e. Will be released with a smaller load than the engagement with
The locking projection 11e comes out of the locking recess 3f, and the cover body 11 is set to swing downward with the engagement boss 11d as a fulcrum. At this time, the locking projection 11e is moved along the inclined surface 3h of the locking recess 3f to form the arm head side surface 3g.
Side, and then one groove end 1 of the guide groove 12
It is set so as to reach the deep groove portion side along the inclined surface 12c on the 2a side.

Here, since the cover body 11 needs to be mounted in close contact with the arm head 3, the cover body 11 is formed such that there is no gap between the cover body 11 and the arm head 3. For this reason, when the cover body 11 swings and deforms, the locking protrusions 11 e formed on the inner surface of the cover body 11 so as to protrude toward the arm head 3 rub against both side portions of the arm head 3,
It is supposed that the frictional force becomes a load when the cover body 11 is mounted. In this case, the groove depth of the guide groove 12 is set to the amount of protrusion of the locking protrusion 11e and received. There is no inconvenience, and care is taken so that the rocking projections 11e are not protruded outwardly even when the swinging operation with the engaging boss 11d as a fulcrum is performed smoothly and the covering posture is reached. Note that, after the cover body 11 swings from the open position and the base end side abuts on the upper part of the base end of the arm head 3,
The cover body 11 is fitted into the arm head 3 so that the peripheral edge 11b of the cover body 11 is pushed open, and the cover body 11 is pressed down strongly in this state. On the end side, a pair of claw pieces 11f are formed so as to protrude in a state of facing inward, respectively.
A pair of notch grooves 3i are formed opposite to 1f, respectively, and when the cover body 11 is in the covering position, the claw pieces 11f are fitted and locked in the notch grooves 3i to prevent the cover body 11 from falling off. Is set to be made.

In the embodiment of the present invention configured as described above, the wiper arm 1 is mounted with the cover body 11 in an open posture with respect to the arm head 3. This is done by tightening a nut 7 on the tip of the wiper shaft 2, but the cover body 11 is open above the wiper shaft through hole 3 a of the arm head 3 above the wiper shaft 2. The locking projection 11e is moved to the locking recess 3
f and held in the open position. As a result, when the work for tightening the nut 7 on the wiper shaft tip 2a, there is no problem that the cover body 11 is in the way of operating the jig J, and the smooth and quick fastening work is performed. Can be.

As described above, according to the embodiment of the present invention, the cover body 11 is held in the open position so that the operation of attaching the wiper arm 3 to the wiper shaft 2 on the skeleton side can be performed smoothly and quickly. But in this one,
The protrusion of the locking protrusion 11e formed to hold the opening position is smaller than the protrusion of the engagement boss 11d, and the guide groove 1 follows the locking recess 3f formed in the arm head 3.
Since the cover 2 is formed, the swinging deformation with the engagement boss 11d as a fulcrum can be performed smoothly, and the locking projection 11e rubs both side surfaces of the arm head 3 when the cover body 11 is attached, so that the cover It does not impair the wearing of the body 11. Moreover, in order to bring the cover body 11 into the open position, it is sufficient to push up the cover body 11 with a slightly strong force shortly before the open position, and to transform the cover body 11 to the covering position side,
What is necessary is just to push down the base end part of the cover body 11 strongly. As a result, the wiper arm 1 with the cover body 11 mounted in a freely swinging state is assembled into the wiper shaft 2, and the cover body 11
Can be smoothly and quickly performed to cover the arm head 3 with, and the workability can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, and the groove shape of the guide groove 14 is different from that of the second embodiment shown in FIGS. And the shape of the locking projection 15 for locking in the guide groove 14 can be formed as follows. That is, in this embodiment, the locking projection 15 is formed in a wedge shape so as to have the same projection amount as the groove depth of the guide concave groove 14 and to be smaller than the engagement boss 11d. On the other hand, the guide groove 14
Has a V-groove shape for receiving the locking projection 15. The guide groove 14 is substantially the same arc locus as the swing locus of the locking projection 15 which is displaced in accordance with the deformation swing of the cover body 11 from the open posture to the covering posture with the engagement boss 11d as a fulcrum. The guide groove 14 is formed so as to be divided along the guide groove 14, and the guide groove 14 moves from the groove end at one end to the groove end at the other end.
4a and a plurality of offset locking portions 14b for temporarily locking the locking projections 15. That is, the guide groove 14
The moving guide portion 14a is configured so that a linear state in which the moving guide portion 14a sequentially deviates from the outer side to the inner side with respect to the arc locus is repeated stepwise. The biasing locking portion 14b is formed at a portion where the movement guide portion 14a switches stepwise from the outside to the inside with respect to the arc. In addition, the biasing locking portion 14b locks the locking projection 15 in a temporarily fixed manner against the own weight of the cover body 11, but when a load exceeding the temporary locking is applied to the cover body 11. Is temporarily released and the next movement guide portion 14a is released.
It is set so that it is guided to move. By doing so, the cover body 11 held in the open position is
The locking protrusion 15 formed on the arm head 3 is locked by the biasing locking portion 14b at the uppermost end of the guide groove 14. At this time, the cover body 11 is transformed into the covering posture. When a load is applied, the locking projection 15 is switched by the release of the locking of the uppermost biasing locking part 14b, and is guided by the next movement guiding part 14a. If the load has not been eliminated, the movement guide unit 14
The locking projections 15 sequentially move the moving guide portions 14a so that the locking of the biasing locking portions 14b is released and switching is performed, and the movement is guided by the next moving guide portion 14a. At the same time as being guided, it is set to be temporarily locked by the bias locking portion 14b. With such a configuration, even when a load for transforming the cover body 11 to the covering posture is applied, the locking projection 15 moves at a stretch from one groove end of the guide groove 14 to the other groove end. In addition, it is possible to prevent the cover body 11 from covering the arm head 3 and causing difficulties when transforming the cover body 11 to the open position again. When the assembling operation is performed while the cover body 11 is held in the open position, the locking projection 15 is moved to the optional bias locking part 1.
By engaging with the cover 4b, the cover body 11 can be temporarily fixed to a free position and work can be performed, so that the workability of assembly can be improved.

[Brief description of the drawings]

FIG. 1 is an overall front view of a wiper device.

FIGS. 2A and 2B are a plan view and a front view of a wiper arm, respectively.

FIGS. 3A and 3B are a bottom view of the wiper arm and a cross-sectional view taken along line XX of FIG. 2A, respectively.

FIG. 4 is an enlarged front view of an essential part for explaining the operation of the cover body.

FIGS. 5A, 5B, and 5C are a plan view, a front view, and a bottom view of an arm head, respectively.

6 (A), 6 (B) and 6 (C) each show FIG.
It is XX sectional drawing of (A), XX sectional drawing of FIG.5 (B), and YY sectional drawing of FIG.5 (B).

7 (A), (B), (C) and (D) are an enlarged side view, a partially enlarged front view, an enlarged plan view and an XX cross section of FIG. 7 (B), respectively, of the arm head. FIG.

FIG. 8 (A), (B), (C), (D), (E)
Is a plan view, bottom view, and X of FIG.
FIG. 9 is a cross-sectional view taken along a line X-X, a cross-sectional view taken along a line XX in FIG. 8B, and a cross-sectional view taken along a line YY in FIG.

FIG. 9 is an enlarged front view of an essential part for explaining an operation of a cover body according to the second embodiment.

FIGS. 10A, 10B, and 10C are a cross-sectional side view, a cross-sectional front view, and a perspective view of a main part, respectively, showing a second embodiment.

FIG. 11 (A), (B), (C), (D),
(E) is a plan view, bottom view, and FIG.
(A) XX sectional view, FIG. 11 (B) XX sectional view,
It is YY sectional drawing of FIG.11 (B).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiper arm 2 Wiper shaft 3 Arm head 3e Engagement part 3f Engagement concave part 4 Arm shank 7 Nut 8 Energizing bullet 11 Cover body 11d Engagement boss 11e Engagement projection 12 Guide groove 14 Guide groove 14a Move guide part 14b Offset locking section 15 Locking projection

Claims (5)

[Claims] 1. A cover having a base end attached to an arm head fixed to a wiper shaft via fixing means, wherein the cover is attached to an engagement portion provided at a tip end of the arm head by a swing fulcrum. As a covering posture for covering the base end of the arm head,
The wiper device is provided with holding means for holding the open posture of the cover body between the cover body and the arm head, so as to freely swing to the open posture where the upper end of the arm head is opened. Arm head cover body. 2. A cover body of an arm head in a wiper device according to claim 1, wherein the holding means is a locking projection and a locking recess formed between the cover body and the arm head. 3. A cover body of an arm head in a wiper device according to claim 2, wherein the locking between the locking projection and the locking recess is released with a load smaller than the engagement at the arm head engaging portion. . 4. The cover body according to claim 2, wherein the cover body has a locking projection, and the arm head has a locking recess. A cover body of an arm head in a wiper device in which a guide concave portion for guiding movement of a locking projection accompanying a dynamic deformation is extended. 5. The guide recess according to claim 4, wherein the guide recess has a groove shape, and the guide recess has a plurality of guide grooves substantially along the same arc locus as the swing locus of the engaging projection. Is provided in a state following the step, and is configured to temporarily lock the locking projection in a temporarily fixed manner.