JPH0437805Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a variable arm length wiper device installed in a vehicle such as an automobile.

[Prior art and problems to be solved by the invention] In general, a wiper device is constructed by providing a blade at the tip of a wiper arm that is provided so as to be able to swing back and forth. As the wiper arm swings, the window surface is merely wiped in a fan shape, so the wiped area is small. So, for example, Utsukai Showa 53-26035
As shown in the publication, the arm length of the wiper arm is extended and contracted in conjunction with the swinging of the wiper arm, thereby increasing the wiping area and efficiently wiping the window corners, or the 52nd Utility Model.
As shown in Publication No. 37538, when the turn-around position is reached,
Wiper wipers are known in which the wiper area is increased by changing the angle of the blade relative to the wiper arm. However, these devices do not allow wiping due to the expansion and contraction of the arm length and changes in the angle of the blade.
They are not performed in conjunction with a series of swings of the wiper arm, but are performed individually.
The reality is that there is still no known device that performs these actions in unison by a series of swinging movements of the wiper arm.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was created with the aim of providing a variable arm length wiper device that can eliminate these drawbacks. The movable arm, which has a wiper blade on its tip, moves forward and backward in the length direction of the wiper arm.The swing arm reciprocates between the lower and upper reverse positions of the wiper arm in conjunction with motor drive. While freely supporting the wiper arm, the movable arm is moved forward in the middle of the swinging process from the bottom inverted position of the swinging arm to the top inverted position to maximize the wiper arm length, and thereafter is moved back in the process of reaching the top inverted position. In the variable arm length wiper device, the wiper device is connected to a connecting link that relatively swings in conjunction with a motor drive so as to reduce the wiper arm length by moving the movable arm. A wiper blade is integrally provided at the distal end, and the proximal end is attached to the distal end of the movable arm. A link rod is interposed between the intermediate part of the oscillator, which is swingably supported in the part, and the movable piece, so that the movable piece can be moved relative to the tip side against the movable arm against the movable arm. , the lower side of the wiper blade is configured to variably swing relative to the wiper arm toward the upper reverse position, and is supported on the swing arm so as to be movable in the longitudinal direction of the wiper arm, and is linked to the motor drive. A stopper is provided which is connected to an auxiliary link that swings relative to each other and restricts the moving piece from moving in and out.
The movable piece catches up to the stopper and contacts the swinging shafts of the swinging arm, the auxiliary link, and the connecting link in the middle of the process when the wiper arm reaches the maximum length and reaches the upper reverse position. However, in the process of reaching the upper inversion position, the movable piece is provided at a position shifted to restrict the retraction, and after the movable piece contacts the stopper, in the swinging process toward the upper inversion position, The present invention is characterized in that the movable piece is configured to move relative to the movable arm toward the distal end by restricting the movable piece from moving toward the proximal side integrally with the movable arm.

With this configuration, the present invention is capable of wiping over an extremely wide area by linking the expansion and contraction of the wiper arm and changing the angle of the blade through a series of swinging movements of the wiper arm.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a swing shaft rotatably supported on the vehicle body side, and a swing arm 2, a swing arm 3, and an operating arm 4 are integrally provided on the swing shaft 1. It is being The swinging arm 3 is configured to swing back and forth between a lower inversion position and an upper inversion position within a predetermined angle range by the swinging displacement of the swinging arm 2 driven by a wiper motor (not shown). . On the other hand, a pivot shaft 5 is rotatably supported on the operating arm 4, and an idler gear 6 is integrally attached to the pivot shaft 5, and the idler gear 6 is integrally attached to the fuselage side. It meshes with a fixed gear 7 fixed to the. As described above, as the swinging arm 3 swings, the swinging gear 6 revolves around the fixed gear 7 while rotating, and the pivot shaft 5 fixed to the swinging gear 6 rotates around the fixed gear 7. is also configured to move integrally with the idler gear 6.

Reference numeral 8 denotes a guide provided integrally with the swinging arm 3, and a movable arm 9 is provided on the guide 8 so as to be swingable in the arm length direction. The movable arm 9 has a base end connected to a swing link 5a integrally provided with the pivot shaft 5.
It is interlocked and connected to the distal end of the body via a connecting link 10. The movable arm 9 operates as a telescopic link between the swing link 5a and the connecting link 10 as the swing arm 3 swings from the stop position (lower inverted position) to the folded position (upper inverted position). Therefore, the arm gradually moves forward toward the distal end side, and when it reaches the approximate corner of the window W, it reaches the maximum forward state (longest state, see Figure 2 B), and thereafter moves backward toward the arm base end side. In this case, the movable arm 9 is set to move further toward the arm proximal end than when the wiper arm A is at the stop position.

Reference numeral 12 denotes a blade, and the blade 12 is integrally fixed to the tip of an oscillator (swivel piece) 13, and the base end of the oscillator 13 is connected to It is pivotally supported at the tip of the movable arm 9 so as to be swingable. Furthermore, the rocker 13
The tip of the link rod 14 is connected to the pin shaft 1 in the middle of the
It is pivotally connected via 4a so as to be swingable. on the other hand,
15 is a movable piece provided on the movable arm 9 so as to be slidable in the arm length direction;
5 is constantly urged toward the base end of the arm by the ammunition 16, and normally moves integrally with the movable arm 9, but this moving piece 15 is moved against the ammunition 16. By forcibly moving the arm toward the tip side, the link rod 14 performs a link operation relative to the movable arm 9, and the oscillator 13 moves toward the pin shaft 1.
3a as a fulcrum, and thereby the oscillator 13
The angle of the blade 12 with respect to the wiper arm A changes, and the lower side of the blade 12 is in the folded direction (upper reversed position direction).
It is structured so that it swings so as to extend toward the side.

On the other hand, 17 is a movable stopper provided on the guide 8 so as to be slidable in the arm length direction so as to correspond to the movable piece 15, and between the movable stopper 17 and the intermediate portion of the swing link 5a, there is provided an auxiliary stopper. A link 18 is interposed. The rotary stopper 17 is guided by the guide 8 and moves in conjunction with the reciprocating and reversing rocking of the swing arm 3 described above, and the movable stopper 17 operates as follows.
That is, the movable piece 15 is normally located closest to the arm proximal end side by the ammunition 16, and when the movable arm 9 moves forward as described above, the movable arm 9 is moved in this state.
Therefore, in this case, there is no change in the angle of the oscillator 13.
As the movable arm 9 moves backward in accordance with the swinging of the swinging arm 3 toward the upper inverted position, when the movable arm 9 returns to approximately the same position as the swinging start position with respect to the swinging arm 3, the moving arm 15 catches up with and comes into contact with the movable stopper 17, which moves slowly but in the same direction as the movable arm 9, and the movable stopper 17
This will lead to an integrated gradual retreat. Therefore, between the movable arm 9 that quickly retreats,
The movable piece 15 moves relatively toward the arm tip side, causing a change in the angle of the oscillator 13 with respect to the wiper arm A (see FIG. 2D).

In the embodiment of the present invention configured as described above, the swinging arm 3 swings due to the swinging motion of the swinging arm 2 accompanying the drive of the wiper motor, and the blade 12
However, in the present invention, wiping is performed over a wider wiping area than ever before.

That is, when the swinging arm 3 swings due to motor drive, the operating arm is moved by the telescopic link operation between the swinging link 5a and the connecting link 10 as the floating gear 6 revolves around the fixed gear 7 while rotating. 9 will move toward the arm tip side along the guide 8, and as a result, the movable arm 9 will move forward toward the arm tip side, the arm length will become longer, and the movable arm 9 will be in the most advanced state at the corner portion of the window W. From then on, the wiper arm A gradually retreats toward the proximal end side, and in this way a wiping operation in which the arm length of the wiper arm A expands and contracts is performed. When the swinging arm 3 further swings toward the upper inverted position, the movable arm 9 moves back beyond the original position relative to the swinging arm 3 toward the base end of the arm. When the movable arm 9 reaches approximately the original position, the movable piece 15 comes into contact with the gently retreating movable stopper 17 to catch up with the movable stopper 17, and the integral backward movement of the movable arm 9 of the movable arm 9 is restricted. As a result, the movable piece 15 moves slowly relative to the movable arm 9 toward the arm tip side, and the oscillator 13 is moved by the link operation of the link rod 14 connected thereto. The blade swings about the pin shaft 14a as a fulcrum to change the angle with the wiper arm A, and the wiping operation is performed with the lower side of the blade 12 protruding close to the window edge. Then, after turning back, it swings to the stop position along the opposite wiping trajectory.

As described above, in the present invention, in the series of swinging processes from the lower inverted position of the swinging arm 3 to the upper inverted position, the wiping operation in which the arm length of the wiper arm A expands and contracts, and the wiper arm of the oscillator 13 It is possible to perform the wiping operation that involves angle changes with respect to A at the same time, thus wiping over a wide range that is not possible with conventional wipers. area). Furthermore, this wiping operation accompanied by a change in angle is performed by bringing the movable piece 15 provided on the movable arm 9 into contact with the movable stopper 17, which moves slowly during the retreating process of the movable arm 9, so as to catch up with the movable stopper 17. It is something. For this reason, it is not possible to make the movable arm 9 quiet without producing an impact sound when the movable arm 9 makes contact, unlike the case where the movement of the movable arm 9 is restricted by a fixed stopper. The angle change is gentler than when changing the angle with a fixed stopper, and it is possible to maintain a posture as parallel to the side edge of the window W as possible, allowing a wider wiping area to be achieved. This means that it can be secured. Furthermore, by adjusting the link pitch, the angle change of the blade 12 can be freely set, and therefore it is extremely easy to achieve the optimum wiping locus that matches the shape of the window.

[Operations and Effects] In short, the present invention is constructed as described above, and the wiper arm performs a wiping operation with extension of the wiper arm through a series of swings from the lower reversed position to the upper reversed position, and the movable arm By restricting the integral retraction of the moving piece with the movable arm during the backward movement process of the wiper blade, the wiping operation accompanied by swinging changes of the wiper blade is performed at the same time, which is unprecedented. This means that a wide area can be wiped away, ensuring a wide range of visibility during rain. Moreover, this wiping operation that involves the swinging of the wiper blade is achieved by the movable piece catching up with and contacting the stopper which is slowly retreating, thereby restricting the movable piece from moving together with the movable arm. Because of this, the impact when the movable piece comes into contact with the stopper is absorbed, making it quieter, and the change in swing angle is also slower than when the movable piece is regulated by a fixed stopper. , it can be made to fit as closely as possible to the side edge of the window, and therefore a wider wiping area can be secured.

[Brief explanation of drawings]

The drawings show an embodiment of the wiper device with variable arm length according to the present invention, in which FIG. 1 is a schematic plan view of the wiper device, and FIGS. 2A, B, C, and D are explanatory diagrams of the operation. , FIG. 3 is a state diagram showing the wiping locus. In the figure, 3 is a swing arm, 5a is a swing link, 9
10 is a movable arm, 10 is a connecting link, 12 is a blade, 13 is an oscillator, 14 is a link rod, 15 is a movable piece, 16 is a bullet, 17 is a movable stopper, 18 is an auxiliary link, and A is a wiper arm.

Claims (1)

[Scope of utility model registration request] The movable arm, which has a wiper blade on its tip, moves forward and backward in the length direction of the wiper arm.The swing arm reciprocates between the lower and upper reverse positions of the wiper arm in conjunction with motor drive. While freely supporting the wiper arm, the movable arm is moved forward in the middle of the swinging process from the bottom inverted position of the swinging arm to the top inverted position to maximize the wiper arm length, and thereafter is moved back in the process of reaching the top inverted position. In the variable arm length wiper device, the wiper device is connected to a connecting link that relatively swings in conjunction with a motor drive so as to reduce the wiper arm length by moving the movable arm. A wiper blade is integrally provided at the distal end, and the proximal end is attached to the distal end of the movable arm. A link rod is interposed between the intermediate part of the oscillator, which is swingably supported in the part, and the movable piece, so that the movable piece can be moved relative to the tip side against the movable arm against the movable arm. , the lower side of the wiper blade is configured to variably swing relative to the wiper arm toward the upper reverse position, and is supported on the swing arm so as to be movable in the longitudinal direction of the wiper arm, and is linked to the motor drive. A stopper is provided which is connected to an auxiliary link that swings relative to each other to restrict the movement of the movable piece, and the swing arm;
Each swing shaft of the auxiliary link and connecting link is
On the way to the above-mentioned state in which the wiper arm reaches its maximum length and reaches the top inverted position, the movable piece catches up with the stopper and comes into contact with it, and in the process of reaching the top inverted position, the movable piece is restricted from moving in or out. In the swinging process toward the upper inverted position after the movable piece contacts the stopper, the movable piece is integrally provided with the movable arm and is restricted from moving toward the proximal end side. A variable arm length wiper device, characterized in that the movable piece is moved relative to the distal end side with respect to the movable arm.