JPH11348735A - Parallel wiping type wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parallel wiping type wiper device constituted so that a wiper arm can be moved outside a mounting position of a pulley. SOLUTION: A parallel wiping type wiper device is constituted by a strap body or a belt body 7 stretched between a first and a second pulleys 6a and 6b provided in the neighborhood of each end of a guide rail 2 extending along a window frame, and a slider 3 reciprocating on the guide rail, connected to each end of the strap body or a belt body, one end of the strap body or the belt body 7 extending from the first pulley 6a to the slider 3 is crossed by the other end of the strap body or the belt body 7 extending from the second pulley 6b to the slider 3 in the neighborhood of the slider 3, and one end of the slider 3 is connected to the second pulley 6b side of the slider 3, while the other end to the first pulley side of the slider 3. By this, the distance between the point starting to leave from the outer circumference of the pulley and the connecting point to the slider 3 of the strap body or the belt body 7 can be made wider, and even if a wiper arm is moved outside the pulley, a winding angle of the strap body or the belt body 7 over the pulley can be kept as an obtuse angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel wiping type wiper device for wiping raindrops on a window glass by reciprocating an upright wiper arm in a lateral direction.

[0002]

2. Description of the Related Art A parallel wiping type wiper device for reciprocating a wiper arm having a blade extending vertically so as to reciprocate left and right to wipe raindrops on a window glass is disclosed in, for example, Japanese Patent Publication No. 47-29533. Is disclosed.

In the wiper device described in the above publication,
A wire rope stretched between two pulleys is connected to a base of the wiper arm, and the wiper arm is moved right and left by a pulling force generated on the wire rope by driving the pulley to rotate.

[0004]

However, according to this known structure, if the winding angle of the wire rope with respect to the pulley becomes acute, it becomes impossible to apply a pulling force to the wiper arm in the left-right direction. For wiping, each pulley must be arranged outside the windshield end, that is, outside the vehicle body. However, it is practically impossible to install the pulley at such a position, and it is difficult to set the movement limit of the wiper arm to the left and right sides of the windshield in consideration of the space for assembling the pulley.

[0005] The present invention has been devised to solve such a problem, and a main object of the present invention is to provide a parallel wiping device which is configured so that a wiper arm can be moved outside a pulley installation position. An object of the present invention is to provide a mold wiper device.

[0006]

In order to achieve the above object, according to the present invention, a guide rail 2 extending along a window frame and first and second guide rails provided near each end of the guide rail are provided. 2 pulleys 6a and 6b, a string or band 7 bridged between the first and second pulleys, and a slider connected to each end of the string or band to reciprocate on a guide rail And one end of a string or a band extending from the first pulley toward the slider and the other end of the string or the band extending from the second pulley toward the slider. The present invention provides a parallel wiping-type wiper device, wherein the wiper devices cross each other in the vicinity, and one end is connected to the second pulley side of the slider and the other end is connected to the first pulley side of the slider. According to this, the distance between the point at which the string-shaped body or the band-shaped body starts to separate from the outer periphery of the pulley and the connection point with the slider can be further increased. The winding angle of the shape or the band with respect to the pulley is maintained at an obtuse angle, and each pulley can be installed inside the windshield end, that is, in the vehicle body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of a parallel wiping type wiper device to which the present invention is applied. This wiper device
A guide rail 2 extending in the left-right direction along a lower edge of a front windshield 1 of an automobile;
A wiper arm 5 whose base end is supported by the slider 3 and integrally holds the wiper blade 4; And a tension pulley 6c pressed by a spring force or the like toward the belt 7 so as to apply a constant tension to the belt 7, and each of the belts 7 is provided with a belt 7 extending between the pulleys 6a and 6b. An end is connected to the slider 3 and one of the two pulleys 6a and 6b is driven to rotate forward and backward by a motor (not shown) so that the wiper blade 4 is reciprocally moved in parallel via the slider 3. It was done.

The belt 7 is stretched between the pulleys 6a and 6b and both ends thereof are connected to the slider 3.
More specifically, one end 7a of the belt that is wound rightward around the right pulley 6b and then extended is connected to the left side of the slider 3, and is wound around the left pulley 6a counterclockwise and then extended. The other end 7b of the released belt is connected to the right side of the slider 3.

Thus, the right pulley (first pulley) 6b
One end 7a of the belt (string or band) extending toward the slider 3 from the other end and the other end 7b of the belt extending toward the slider 3 from the left pulley (second pulley) 6a In the vicinity of the slider 3, one end 7a is located on the left pulley 6a side of the slider 3 and the other end 7b is located on the slider 3
Are connected to the right pulley 6b side of the pulley 6b. Therefore, even if the base end of the wiper arm 5 connected to the center of the slider 3 moves outside the center of each pulley 6a Since the winding angle of the belt 7 is maintained at an obtuse angle, the pulling force of the belt due to the rotational force of the pulley continues to act. Therefore, the movement limit of the slider 3, that is, the wiper arm 5,
• Can be set outside 6b.

Although it is preferable to use a timing belt having no slippage between the pulley and the pulley in order to ensure smooth operation, it is difficult to cross a wide belt such as a timing belt. To solve this problem,
As shown in FIG. 2, hinge portions 8a and 8b vertically offset from each other are provided on the slider 3, and the belt ends 7a and 7
By connecting each end 7a, 7b of the belt 7 to the slider 3 via a connecting member 9a, 9b in which the connecting portion for b and the connecting portion for the hinge portions 8a, 8b are offset, these connecting portions are vertically It is good to avoid interference. Further, as shown in FIG. 3, the ends 7a and 7b of the belt may be partially cut off so that they do not interfere with each other when they are overlapped, and then directly connected to the slider 3.

Since the sum of the distance from one focal point to a certain point on the circumference of the ellipse and the distance from the certain point to the other focal point is constant, the curvature of the guide rail 2 If a part of an ellipse having a focal point at the contact point with each of the pulleys 6a and 6b is used, the slider 3 can travel on the guide rail 2 while keeping the length of the belt 7 constant. Actually, since the contact point of the belt 7 with each of the pulleys 6a and 6b always changes with the left and right movement of the slider 3,
Cannot be strictly constant, but in practice, if the curvature of the guide rail 2 is a part of an ellipse whose focal point is the center of each of the pulleys 6a and 6b, at least the slack of the belt 7 is reduced. Since the amount is reduced, the amount of displacement of the pulley 6c as a tensioner device for applying tension to the belt 7 can be reduced, which is effective in further compacting the device configuration.

[0013]

As described above, according to the present invention, the installation position of the pair of pulleys for driving the slider supporting the wiper arm can be set inside the windshield end of the vehicle body, that is, inside the vehicle body. Since there is no disadvantage that the wiping area is reduced due to the restriction on the arrangement of the pulleys with respect to the vehicle body, it is possible to achieve a great effect in achieving both higher compactness of the entire apparatus and expansion of the wiping area. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a parallel wiping type wiper device to which the present invention is applied.

FIGS. 2A and 2B are a rear view and a plan view showing an example of a connecting portion of a belt to a slider. FIGS.

FIG. 3 is a perspective view showing another example of a connecting portion of a belt to a slider.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front windshield 2 Guide rail 3 Slider 4 Blade 5 Wiper arm 6a ・ 6b Front pillar 6c Tension pulley 7 Belt 7a ・ 7b Terminal 8a ・ 8b Hinge part 9a ・ 9b Connecting member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taizo Kikuchi 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Inventor Toru Hagi 1-4-1-1 Chuo, Wako-shi, Saitama No. Inside Honda R & D Co., Ltd. (72) Inventor Takashi Hoshino 1-2681-1, Hirosawa-cho, Kiryu-shi, Gunma Pref.

Claims (2)

[Claims] A guide rail extending along the window frame;
First and second guides provided near each end of the guide rail
A pulley, a string or a band spanned between the first and second pulleys, and a slider connected to each end of the string or the band and reciprocating on the guide rail. A parallel wiping-type wiper device, comprising: one end of the string-shaped body or the band-shaped body extending from the first pulley toward the slider; and the string-shaped body extending from the second pulley toward the slider. Alternatively, the other end of the strip is crossed with each other near the slider, the one end is connected to the second pulley of the slider, and the other end is connected to the first pulley of the slider. Parallel wiping type wiper device. 2. The method according to claim 1, wherein the guide rail is provided with the first and second guide rails.
2. The parallel wiping wiper device according to claim 1, wherein each of the pulleys is a part of an ellipse whose focal point is at each center of the pulley.