JPH0418926Y2 - - Google Patents

Description

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

[Prior art and problems to be solved by the invention] In general, this type of 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. Since the wiper arm simply wipes the window surface in a fan shape as the wiper arm swings, it has the disadvantage that the area to be wiped at the window corners and folded positions is inevitably small.

Therefore, for example, as shown in Japanese Utility Model Application Publication No. 53-26035, the 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 corner of the window. There are also known methods such as those shown in Japanese Utility Model Publication No. 52-37538, in which the wiper area is increased by changing the blade angle relative to the wiper arm when the wiper reaches the return position. However, these wipers do not perform wiping by expanding and contracting the arm length and changing the angle of the blade in conjunction with a series of swinging movements of the wiper arm, but they are performed individually. The fact is that there is still no known device that performs this in conjunction with 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 devised for the purpose of providing a wiper device that can eliminate these drawbacks. a wiper arm configured by a swinging arm that swings back and forth, and a movable arm that can move forward and backward to change the length of the arm; A movable piece, a bullet that is interposed between the movable piece and the movable arm, and urges the movable piece to be located at a retraction limit position provided on the movable arm, and a blade are integrally provided, and the movable An oscillator is pivotally connected to the tip of the arm, and the oscillator is interposed between the oscillator and the movable piece, and the oscillator is oscillated by the relative movement of the movable piece with respect to the movable arm. The movable arm includes a link rod for performing angular displacement with respect to the wiper arm, and a stopper provided on the swing arm to limit the backward movement of the movable piece with respect to the swing arm. In this case, the movable arm is positioned at a semi-retracted position where the movable arm is at the retracted limit position and is not restricted from moving in the backward direction by the stopper. , the movable arm moves forward from the semi-retracted position and then retreats back to the semi-retracted position again to perform a reciprocating movement to extend and contract the arm length, and in the process of the swinging arm reaching the folded back position, the movable arm stops at the stopper. The movable arm is movable such that only the movable arm is moved further backward beyond the semi-retracted position, and the blade is moved angularly with respect to the wiper arm as the movable piece moves relative to the movable arm. This device is characterized by being provided with a forward/backward moving mechanism for moving the arm forward and backward.

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. It is.

[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 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, the actuating arm 4 constitutes the advancing and retracting mechanism of the present invention together with member devices such as a pivot shaft 5, a floating gear 6, and a fixed gear 7, which will be described later.
A pivot shaft 5 is rotatably supported on the operating arm 4. An idler gear 6 is integrally attached to the pivot shaft 5, and the idler gear 6 meshes with a fixed gear 7 that is integrally fixed to the body. As described above, when the swing arm 3 swings, the idle gear 6 revolves around the fixed gear 7 in a state of rotation, and the pivot shaft 5 fixed to the idle gear 6 also rotates. It is 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. This movable arm 9 constitutes the wiper arm A.
A base end portion of the shaft 5 is operatively connected to the pivot shaft 5 via a link 10. The movable arm 9 gradually moves toward the tip end in the arm length direction by the operation of the link 10 that follows the swinging of the swinging arm 3 from the stop position (stopping position) to the turning position (reversing position). It is configured to move forward toward the arm, reach the approximate corner of the window W, reach the maximum forward state (longest state, see Fig. 2B), and thereafter move backward toward the base end of the arm. In this case, the movable arm 9 returns to the retracted position with respect to the swing arm 3 when the wiper arm A is at the stop position, that is, the semi-retracted position (see Fig. 2C). ), and the movable arm 9 moves beyond the semi-retracted position and further retreats toward the base end of the arm in the process of the wiper arm A reaching the folded-back position from this nearby position, and reaches the most retreated position when it reaches the folded-back position. located (Fig. 2D)
(See) It is set to move forward and backward.

Further, the blade 12 is integrally fixed to the oscillator (swivel piece) 13,
The base end of the rocker 13 is pivotably supported to the tip of the movable arm 9 via a pin shaft 13a. Further, the tip of a link rod 14 is pivotally attached to the oscillator 13 via a pin shaft 14a. On the other hand, reference numeral 15 denotes a movable piece 15 that is provided so as to be slidable in the arm length direction of the swing arm 3, and the movable piece 15 is always attached by a bullet 16 toward the base end of the arm. The moving piece 15 is moved against the projectile 16, and is located at a retreat limit position 9a provided on the movable arm 9, and normally moves integrally with the movable arm 9. By forcibly moving the arm toward the tip side, the link rod 14 performs a relative link operation with respect to the movable arm 9, thereby causing the oscillator 13 to oscillate about the pin shaft 13a as a fulcrum. The angle of the oscillator 13 with respect to the wiper arm A changes, and the blade 12 swings so that its lower side protrudes toward the folding direction. However, this forced movement of the movable piece 15 toward the arm tip side It is done as follows.

That is, as described above, the movable piece 15 is normally positioned at the retraction limit position 9a closest to the arm proximal end by the ammunition 16. In the process of the wiper arm A reaching from the stop position to the vicinity of the folding position, the movable arm 9 retreats only to the semi-retracted position, and when retracting to this range, the movable arm 15 moves integrally with the movable arm 9. Become. Therefore, in this case, there is no change in the angle of the oscillator 13. On the other hand, in the process in which the wiper arm A moves from the near-returning position to the reversing position, the movable arm 9 moves further backward beyond the semi-retracted position, as described above. And movable arm 9
When the movable arm 15 attempts to move further backward beyond the semi-retracted position, the movable piece 15 comes into contact with a stopper 17 provided on the swing arm 3, and further backward movement is restricted, whereby only the movable arm 9 moves backward beyond the semi-retreat position against the ammunition 16. As a result, the movable piece 15 moves relative to the movable arm 9, which causes the oscillator 13 to oscillate, causing a change in the angle of the blade 12 with respect to the wiper arm A. (See FIG. 2D) In the embodiment of the present invention constructed 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 swing arm 3 swings as the motor is driven, the movable arm 9 moves along the guide 8 to the tip of the arm due to the link operation of the link 10 as the idle gear 6 rotates and revolves around the fixed gear 7. After moving forward toward the side, the wiper arm A moves backward, and the arm length of the wiper arm A becomes the longest at a substantially corner portion of the window W halfway, and a wide wipe is performed by entering the corner portion. . When the wiper arm A reaches a position close to the folded back position, the swing arm 3 is located at the same semi-retracted position as the wiper arm A was at the stop position. Although the movable arm 9 moves beyond the semi-retracted position and retreats further toward the base end of the arm, the movable piece 15 contacts the stopper 17 and is prevented from moving further backward with the movable arm 9. As a result, the movable arm 9 As a result, the moving piece 15 moves relative to the movable arm 9 toward the arm tip side, and by the link operation of the link rod 14 connected thereto, the oscillator 13 moves backward. 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.

In this way, in the present invention, wiper arm A
In a series of swinging processes from the stop position to the folding position, first, the arm length of the wiper arm A expands and contracts to wipe the corner of the window widely, and then when the folding position is reached, the swing of the oscillator 13 relative to the wiper arm A A wide wiping action is performed with angle changes, and therefore a wide range of wiping is performed that is not available with conventional wipers (the hatched part in FIG. 3 is a wide wiping area). Furthermore, the series of wiping operations accompanied by changes in the length of the arm and changes in the angle of the blade with respect to the arm moves the movable arm 9 together with the movable piece 15 to the semi-retracted position in the process of the wiper arm A from the stop position to the folded back position. After being moved forward as a reference and then retreated again to the semi-retracted position, the movable piece 15 is prevented from moving backward by the stopper 17, so that only the movable arm 9 is further retreated beyond this semi-retracted position. The structure is not particularly complicated.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, but the mechanism for moving the movable arm forward and backward does not use a fixed gear, a floating gear, and a link as in the above-mentioned embodiment. It is also possible to use a cam mechanism 19 as shown in FIG. Furthermore, by appropriately changing the stopper restriction position of the movable piece, the wiping operation that involves a change in angle can be started from a desired position.

[Operations and Effects] In summary, since the present invention is constructed as described above, in the series of swinging processes in which the wiper arm moves from the stop position to the return position, initially,
The arm length of the wiper arm expands and contracts to wipe a wide area of the window corner, and when the wiper arm reaches the folded position, a wide wiping operation is performed with a change in the angle of the oscillator relative to the wiper arm. Therefore, the conventional wiper wipes over a wide range with changes in arm length and angle.

Moreover, the series of wiping operations accompanied by changes in the length of the arm and changes in the angle of the blade with respect to the arm is performed by moving the movable arm together with the movable piece with reference to the semi-retracted position in the process of the wiper hoom from the stop position to the folded position. After reciprocating forward and backward movement to change the length of the arm, when it reaches the vicinity of the return position, the backward movement of the movable piece is restricted by a stopper, and only the movable arm is moved to this semi-retracted position. This can be done by further retracting it beyond the 200 degrees, and therefore, the structure is not particularly complicated.

[Brief explanation of the drawing]

The drawings show an embodiment of the wiper device according to the present invention, in which FIG. 1 is a schematic plan view of the wiper device, FIGS. 2A, B, C, and D are action explanatory views, and FIG.
The figure is a state diagram showing a wiping locus, and FIG. 4 is an explanatory diagram of main parts showing another embodiment. In the figure, 3 is a swinging arm, 9 is a movable arm, 12
is a blade, 13 is an oscillator, 14 is a link rod, 1
5 is a moving piece, and 17 is a stopper.

Claims (1)

[Scope of utility model registration request] A wiper arm A includes a swing arm 3 that swings back and forth in conjunction with motor drive, and a movable arm 9 that can move forward and backward to change the length of the arm. a movable piece 15 provided so as to be movable forward and backward;
interposed between the moving piece and the movable arm,
A bullet 16 that urges the movable piece to be located at a retraction limit position provided on the movable arm, and an oscillator that is integrally provided with a blade and is pivotally connected to the tip of the movable arm. 13, a link rod 14 which is interposed between the oscillator and the movable piece, and is used to oscillate the oscillator by moving the movable piece relative to the movable arm, thereby angularly displacing the blade with respect to the wiper arm; The movable arm further includes a stopper 17 that is provided on the swing arm and serves as a limit to the backward movement of the movable piece with respect to the swing arm.
At the stop position of the wiper arm, the movable arm is located at a semi-retreat position where the movable piece is at the retraction limit position and is not restricted from moving in the backward direction by the stopper, and the swing arm is moved from the stop position to the vicinity of the turning position. In the process leading to this, the movable arm is moved forward from the semi-retracted position and then retreated again to the semi-retracted position, thereby performing a reciprocating movement to extend and contract the arm length, and in the process of the swinging arm reaching the folded position, The movable piece contacts the stopper and is restricted from moving in the backward direction, causing only the movable arm to move further backward beyond the semi-retracted position to prevent the angular displacement of the blade relative to the wiper arm due to the relative movement of the movable piece to the movable arm. A wiper device characterized in that it is provided with a forward/backward moving mechanism for moving a movable arm back and forth so as to move the movable arm back and forth.