JPH0730168U - Orbital belt support structure for wipers - Google Patents

Abstract

(57) [Abstract] [Purpose] String 2 placed on the surface of the mirror body
7 is attached to the revolving belt 26, and the revolving belt 26 is attached to the idler pulley 25 and the drive pulley 2.
A mirror wiper device (prior application / actual application No. 4-82047) of a type in which it is wound around 2'and revolves to improve the mounting of the revolving belt and prevent the occurrence of a locked state due to foreign matter being caught. To prevent. [Configuration] Idler pulley 34a is replaced with pulley holder 34b
In addition to supporting the pulley holder 34b with a coil spring 34c, a force is applied to the belt 26 by the coil spring 34c.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for supporting a revolving belt in a wiper device for a vehicle outside mirror, which has a structure using a string as a wiping member.

[0002]

[Prior art]

 FIG. 3 is a front external view of a vehicle outside mirror including a wiper device according to a conventional example. The mirror body 4 is fixed to the mirror body 3, and the mirror body 4 is supported by the mirror housing 12 via the mirror body 3. A mirror base 23 is used by being fixed to the vehicle body, and the mirror base 23 supports the mirror housing 12. A wiper arm shaft 21 is provided penetrating the mirror housing 12, and a wiper arm 24 is attached to the wiper arm shaft 25. When the wiper arm shaft 25 reciprocally rotates, the wiper arm 24 supports the wiper blade 29 and tilts reciprocally, and the wiper blade 29 slides and wipes the surface of the mirror body 4. The conventional mirror wiper device shown in FIG. 3 is unattractive because the wiper arm 24 and the wiper blade 29 appear in appearance even while the wiper operation is stopped, and the product value is reduced. If an eaves-shaped wiper storage portion 20 (shown in phantom) is provided above the mirror housing 12, the wiper blade 29 can be stored and hidden, but the wiper arm 24 cannot be hidden. Further, the wiper arm 24 and the wiper blade 29 are members having a large inertia among the constituent members of the wiper device. Reciprocatingly driving such a member having a large inertia tends to cause noise (operation sound is generated if there is looseness). In order to solve the above-mentioned inconvenience, it is considered that the string-shaped member is slid along the surface of the mirror main body and the wiping action is performed by the string-shaped member. Since the string-shaped member has a small inertia, the required driving force is small, and if the string-shaped member is brought close to one corner of the mirror main body while the wiper operation is stopped, the appearance is hardly damaged. The above-mentioned string-type mirror wiper device is an unknown device (Practical application No. 4-82047. Mirror wiper device), which has been separately filed by the present applicant. For convenience of explanation, the device will be abbreviated as the device of the prior application. FIG. 4 is a partially cutaway front view showing an embodiment of a mirror wiper device according to an unknown prior application. The mirror body 4 is fixed to the mirror body 3. The reflecting mirror that is an optical component is sometimes called a mirror, and the entire assembly using the above reflecting mirror is sometimes called a mirror. Therefore, in the present invention, the single reflecting mirror that is a constituent element is a mirror. It is called the main body and the assembly is called the mirror device to distinguish them. On the back side of the mirror body 3, one driving pulley 22 and three idler pulleys 25 are arranged around the mirror body 3 and an endless circular loop belt 26 is wound around these four pulleys in total. It is hung. A string 27 is stretched over the surface of the mirror body 4 so as to be tightly attached, and one end 27a of the string 27 contacts the edge of the mirror body 4 (depicted by a hidden line) and wraps around to the back side of the mirror body, and is attached to the orbiting belt 26. It is installed. FIG. 5 is a schematic cross-sectional view showing both ends of the string in the above embodiment, (A) shows a state where one end of the string is attached to a loop belt, and (B) shows other parts of the string. The end is shown attached to a tensioner and under tension. The pulley 22 shown in FIG. 5 (A) is the driving pulley described above with reference to FIG. 4, and is rotated by a motor (not shown) via the transmission belt 17 and wound around the circuit. The belt 26 is rotated. One end 27a of a string 27 is fixed to the loop belt 26. In FIG. 4, the pulley 22 is rotated in the direction of the arrow a, and the revolving belt 26 is revolved as indicated by arrows b and c. One end 27a of the string 27 attached to the revolving belt 26 is moved in the direction of the arrow b to the 27a 'position. Along with this, the string 27 at the position drawn by the solid line is tilted up to the position 27 'shown by the chain line by being drawn around like the circular arc arrow d. As can be easily understood from FIG. 4, the linear portion of the string 27 '(chain line) is longer than the linear portion of the string 27 (solid line). Therefore, a tensioner 28 is provided to provide a constant tension so that the string does not come loose or tear. (This tensioner 28 is shown in both FIG. 4 and FIG. 5B, but in FIG. 5B, the central portion is broken and cut and drawn.) The tensioner 28 is configured to draw the other end 27b of the string 27 into the elongated cavity (pipe) 28a. 28b is a tensioner coil spring that applies a force in a direction in which the string 27 is drawn into the conduit 28a. The string 27 is wiped off while being slid along the surface of the mirror body 4 while being kept at a substantially constant tension while being pulled out from the inlet 28c of the tensioner or being pulled in from the inlet 28c. .

The point where one end of the string 27 is attached to the revolving belt 26 (for example, points 27 a and 27 a ′ shown in FIG. 4) revolves together with the revolving belt 26. When the loop belt 26 is stopped when this point comes near the tensioner 28c (for example, the point e), the string 27 also stops and does not appear in the appearance. The reason is that it is hidden by the eaves-shaped portion 3a shown in FIG. Further, in this state, most of the string 27 is drawn into the tensioner 28, and its tip reaches the stroke end 27c. By the time one end 27a of the string at the point e moves in the directions of the arrows b 1 and c 2 along with the rotation of the revolving belt 26 and reaches the point f, almost all the surface of the mirror body 4 (appearance is The entire exposed area) is wiped by the string 27, and no unwiped portion such as that in the conventional example (FIG. 3) is generated.

[0004]

[Problems to be solved by the device]

 In the wiper device according to the invention of the prior application shown in FIG. 4, the revolving belt 26 is wound around three idler pulleys 25 and one drive pulley 22 in order to wipe the string 27 for wiping. One end 27 of the string is fixed and orbits as shown by arrows b and c. In order to achieve the above-mentioned action, the revolving belt 26 is wound around the pulley with an appropriate tension. Since the revolving belt 26 is tensioned as described above, the following technical problems occur. I. When the revolving belt 26 is wound around a plurality of pulleys, a large force is required, so that the assembling workability is not good. In order to reduce the required force for this work, if the winding is loosened, the required tension cannot be obtained.

B. When a foreign matter is caught between the revolving belt 26 and the pulley, the revolving belt 26 is locked in its peripheral rotation and the wiper function is stopped. Not only is the function stop itself inconvenient, but the drive motor may be burned out unless some kind of overload prevention means is taken.

The present invention has been made in view of the above circumstances, and has good workability in assembling, can only apply a predetermined tension to the revolving belt, and can prevent foreign matter from being caught. An object of the present invention is to provide a support structure for a loop belt for a wiper, in which there is no fear that the wiper function will stop.

[0007]

[Means for Solving the Problems]

 In order to achieve the above objectives (improving workability in assembly and preventing lock when foreign matter is caught), the support structure of the present invention has a plurality of pulleys arranged along the periphery of the mirror body fixed to the mirror body. An endless annular loop belt is wound around the plurality of pulleys, and one end of a string movably arranged near the surface of the mirror body is attached to the loop belt and the other end of the string is attached. A structure for supporting a revolving belt used in a wiper device whose end is attached to a tensioner and tensioned, wherein at least one of the plurality of pulleys is an idler pulley. The at least one idler pulley is guided so as to move toward and away from the orbiting belt, and the idler pulley is moved around the orbiting belt. Wherein the spring acts in the direction of pressing toward is provided.

[0008]

[Action]

 According to the above structure, at least one of the idler pulleys can be retracted in the direction away from the revolving belt, that is, in the direction in which the revolving belt is loosened. Therefore, the revolving belt is wound around the pulley while the idler pulley is retracted. It can be assembled quickly and easily. After winding, a spring is provided which acts in the direction of pressing the pulley against the revolving belt, so that the required tension is applied. Further, even when a foreign object is bitten, the pulley moves backward against the force of the spring, so that the wiper function does not stop and there is no fear of overloading the motor.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially cutaway front view showing an embodiment of a support structure for a wiper belt according to the present invention. This embodiment is a front view corresponding to FIG. 4 in the invention of the prior application. This example (FIG. 1) is different from FIG. 4 in the following points.

(A). A large number (six) of idler pulleys 25 are arranged.

(B). A driven toothed wheel 33d is fixed to a drive pulley 22 'that is rotated by being wound around a revolving belt 26, and is rotated by a drive gear 33a via intermediate gears 33b and 33c.

(C). A belt tensioner 34 is arranged at a position where the loop belt 26 is wound. 2A and 2B show the belt tensioner shown in the above embodiment, FIG. 2A is a sectional view taken along the line AA in FIG. 1, and FIG. 2B is a schematic perspective view of the belt tensioner. An idler pulley 34a is rotatably supported by a bifurcated pulley holder 34b. The pulley holder 34b is guided by the mirror body 3 and the holder guide 34e in the direction of movement toward and away from the revolving belt 26 (reciprocating arrow i-j), and the stroke dimension thereof is restricted. . Moreover, the pulley holder 34b is pressed by the coil spring 34c in the direction (arrow i) approaching the orbiting belt 26. FIG. 2A illustrates a state where the stroke end is reached by being pressed and moved in the direction of arrow i. Therefore, the idler pulley 34a rotates at a fixed position unless it receives a force sufficient to bend the coil spring 34c (direction of arrow j).

[See FIG. 2B] When the revolving belt 26 is wound around the pulley, when a force in the direction of arrow j is applied to the idler pulley 34a, the idler pulley 34a bends the coil spring 34c to cause the arrow j to rotate. By retreating in the direction, the revolving belt 26 can be assembled quickly and easily. When the force in the arrow j direction is released after the orbiting belt 26 is assembled, the holder guide 34e and the idler pulley 34a are restored to the positions shown in FIG. A predetermined tension is applied to (Fig. B). As shown in FIG. 2 (B), when the revolving belt 26 is revolving in the direction of the arrow k, when a foreign matter (shown by a virtual line) 35 is caught between the revolving belt 26 and the idler pulley 34a, The idler pulley 34a bends the coil spring 34c and retracts in the direction of arrow j to allow the foreign matter 35 to pass through without causing excessive tension on the belt 26. (See FIG. 1) When foreign matter is caught between the idler pulley 25 other than the idler pulley 34a and the revolving belt 26, and when foreign matter is caught between the drive pulley 22 'and the revolving belt 26. When the idler 34a is caught, the idler pulley 34a retreats and operates similarly.

[0014]

[Effect of device]

 When the present invention is applied, since at least one of the idler pulleys can be retracted in the direction away from the revolving belt, that is, in the direction in which the revolving belt is loosened, the revolving belt is wound around the pulley while the idler pulley is retracted. And can be assembled quickly and easily. After being wound, since a spring is provided which acts in the direction of pressing the pulley against the revolving belt, a required tension is applied. In addition, even when foreign matter is caught, the pulley moves backward against the force of the spring, so the wiper function does not stop, and there is no risk of overloading the motor. Produce an effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a support structure for a wiper belt according to the present invention.

2A and 2B show the belt tensioner shown in the above embodiment, wherein FIG. 2A is a sectional view taken along the line AA of FIG. 1, and FIG. 2B is a schematic perspective view of the belt tensioner.

FIG. 3 is a front external view of a vehicle outside mirror including a wiper device according to a conventional example.

FIG. 4 is a front view showing an embodiment of a mirror wiper device according to an unknown prior application, with a part cut away.

FIG. 5 is a schematic cross-sectional view showing both ends of the string in the above embodiment, (A) shows a state in which one end of the string is attached to a revolving belt, and (B).
Shows the other end of the string attached to a tensioner and under tension.

[Explanation of symbols]

3 ... Mirror body, 4 ... Mirror body, 12 ... Mirror housing, 17 ... Transmission belt, 20 ... Eaves, 22 ... Driving pulley, 23 ... Mirror base, 24 ... Wiper arm, 25 ... Wiper arm shaft, 26 ... Orbit Belt, 27,
27 '... string, 27a, 27a' ... one end of string, 27b ... other end of string, 27c ... stroke end of string, 28 ... tensioner, 28a ... conduit, 28b ... tensioner coil spring, 28c ... tensioner inlet, 29 ... Wiper blade, 34 ... Belt tensioner, 34a ... Idler pulley, 34b ... Pulley holder, 34c ... Coil spring, 34e ... Holder guide, 35 ... Foreign matter.

Claims (1)

[Scope of utility model registration request] 1. A plurality of pulleys are arranged along the periphery of a mirror body fixed to a mirror body, and an endless annular belt is wound around the plurality of pulleys. One end of a string movably disposed near the surface of the string is attached to the loop belt, and the other end of the string is attached to a tensioner to support a loop belt used in a tensioned wiper device. In the structure, at least one pulley of the plurality of pulleys is an idler pulley, and the at least one idler pulley is guided so as to be movable toward and away from the revolving belt. And a spring that acts in a direction to press the idler pulley toward the revolving belt is provided. Support structure of the use lap belt.