JPH01190563A - Wiper device for automobile - Google Patents

Abstract

PURPOSE:To easily vary the pressing pressure of a wiper arm by providing a pressure arm on the same axis as that of a shaft support portion of the wiper arm, oscillating the pressure arm by driving means, and bringing the pressure arm into contact with the wiper arm at a designated position through a contact portion. CONSTITUTION:The base end portion of a fixed member 2 is fitted in the upper end of a pivot shaft 1 turned to reciprocate by a motor, and one end of a link 31 of a wiper arm 3 is supported on the fixed member 2 in such a manner as to freely oscillate by a support shaft 22. A pressure lever 4 is supported by the support shaft 22 and disposed on the fixed member 2, and a coil spring 5 is stretched between the pressure lever 4 and a rod 33. The other end 42 of the pressure lever 4 is positioned above the pivot shaft 1 and brought into contact with the upper end portion 61 of a piston 6 which is disposed as driving means in the interior of the pivot shaft 1. Further, the above link 31 is provided with a stopper pin 7 as a contact portion, which is passed between opposite side wall portions, so that the pressure lever 4 is brought into contact with the stopper pin at a designated position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automobile wiper device having a wiper blade pressing pressure adjustment mechanism.

[Prior Art] In order to improve the durability of wiper blades when an automobile wiper device is not in use, it is desirable to minimize the pressing pressure against the windshield surface to prevent deformation of the blade rubber. On the other hand, during use, the specified pressing pressure can be quickly obtained.
It is required to prevent deterioration in wiping performance due to floating of the wiper.

Conventionally, as a means for adjusting the pressing pressure of a wiper blade, a pressure lever is rotatably supported on a fixed member that rotates integrally with a pivot shaft that rotates back and forth, and the rotation position of the pressure lever is adjusted. It is known that the pressing pressure of the wiper blade can be adjusted by changing the tension of a spring member stretched between the tip of the pressure lever and the wiper arm (for example, as disclosed in Japanese Patent Application Laid-Open No. 62-6853).

[Problems to be Solved by the Invention] By the way, in the conventional wiper device described above, setting the pressing pressure of the wiper blade to zero means that the spring member is completely relaxed or that the tension of the spring member is passed through the support shaft of the wiper arm. This is possible if the pressure lever is rotated in the direction of It is necessary, and the lack of speed is large.

The present invention has been made in order to solve the above-mentioned conventional problems.The present invention has been made in a wiper device that adjusts the pressing pressure of the wiper blade using a spring member. It is an object of the present invention to provide a small-sized wiper device that can quickly obtain a predetermined pressing pressure by only slightly displacing the rotational position of a lever.

[Means for Solving the Problems] In order to achieve the above object, the wiper device of the present invention is provided on a pivot shaft 1 that reciprocates (FIG. 1), and includes a fixed member 2 that rotates integrally therewith, a wiper arm 3 having one end pivotally supported by the fixed member 2, rotatable in a direction perpendicular to the rotating surface of the fixed member 2, and holding a wiper blade at the other end;
A pressure lever 4 that is pivotally supported by the fixed member 2 and rotates, and that changes the tension of a spring member 5 stretched between the fixed member 2 and the wiper arm 3 according to the rotational position; The wiper blade is provided with a driving means 6 for rotationally driving the wiper blade 4, and the pressure applied to the wiper blade can be increased or decreased by rotating the pressure lever 4. Then, either the pressure lever 4 or the wiper arm 3 is provided with an abutting portion 7 that brings the two into abutment at a predetermined position.

When the support shaft of the pressure lever 4 and the support shaft of the wiper arm 3 are positioned concentrically, the pressing pressure on the wiper blade becomes zero by bringing the pressure lever 4 into contact with the wiper arm 3. By bringing the two into contact with each other, the load on the wiper blade can be reduced to zero. Further, these may be positioned eccentrically, and in this case as well, a sufficiently small pressing pressure can be obtained when not in use, and a predetermined pressing pressure can be quickly achieved when in use.

[Function] In the above structure, the pressure lever 4 is moved by the drive means 6.
When the wiper arm 3 and the pressurizing lever 4 are rotated around the axis and come to a predetermined position, the wiper arm 3 and the pressure lever 4 come into contact with each other by a contact portion 7 provided on either of them. At this time, the force acting on the wiper blade by the spring member 5 is rapidly reduced by the contact between the two, and the pressing pressure of the wiper blade is reduced in a stepwise manner. In particular, when the support shaft of the pressure lever 4 and the support shaft of the wiper arm 3 are positioned concentrically, the acting force of the spring member 5 is canceled as an internal force within the wiper arm 3, and the pressing pressure of the wiper blade is reduced. It becomes zero.

When the pressure lever 4 is rotated in the opposite direction, the pressing pressure of the wiper blade increases rapidly with a slight displacement, and the desired pressing pressure is quickly obtained.

[Example] An embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, the hollow pivot shaft 1 is
Housing 12 fixed to vehicle front plate B with screws 13
It is rotatably supported by a washer 14 and a clip 15. Bushes 16 are disposed above and below between the housing 12 and the pivot shaft 1, and a space 17 formed by these bushes is used as a lubricating oil reservoir. The pot shaft 1 is connected to a motor (not shown), and is rotated back and forth by driving the motor.

The upper end of the pivot shaft 1 is fitted into a fitting hole provided in a fixed member 2, and the fixed member 2 has a forked end with a screw 21.
The tightening is fixed. As a result, the fixing member 2
rotates integrally with the pivot shaft 1.

The wiper arm 3 consists of a link 31 whose one end is rotatably supported by the support shaft 22 on the fixed member 2, and a rod 33 fixed to the other end of the link 31 with a rivet 32, and thus the rotation of the fixed member 2 It is rotatable in the direction perpendicular to the plane. A wiper blade (not shown) is connected to the tip of the rod 33.

The fixed member 2 is further provided with a pressure lever 4 supported by the support shaft 22, and the pressure lever 4 is similarly rotatable in a direction perpendicular to the rotating surface of the fixed member 2. be.

A coil spring 5 is tensioned between the pressure lever 4 and the rod 33, with both ends suspended in holes 41 and 331 provided at opposing ends, respectively. On the other hand, the other end 42 of the pressure lever 4 is located above the pivot shaft 1, and is brought into contact with the upper end 61 of a piston 6, which is a driving means, disposed inside the hollow pivot shaft 1. be.

The link 31 of the wiper arm 3 is provided with a stopper pin 7 which passes through the opposing side walls and serves as an abutting part.
The wiper arm 3 and pressure lever 4 are not in contact with each other at a predetermined position.

In the above structure, when the piston 6 is moved up and down within the pot shaft 1 by a drive source (not shown), the pressure lever 4 rotates around the support shaft 22. and,
The tension of the coil spring 5 changes depending on the rotational position, and the pressing pressure of the wiper blade increases or decreases accordingly.

FIG. 3 shows changes in the pressing pressure of the wiper blade depending on the lever position. That is, if the lever position is expressed by the distance H from the support shaft 22 of the coil spring 5 attachment part (Fig. 4), when the pressure lever 4 and the stopper pin 7 are not in contact (Fig. 3A), , H increases, the pressing pressure of the wiper blade increases. Then, when the pressure lever 4 is rotated in the opposite direction and comes into contact with the stopper pin 7 (the third
In Figure B), the acting force of the coil spring 5 is canceled out as an internal force, and the pressing pressure rapidly decreases to zero.

Therefore, if the spring constant of the coil spring 5 is selected so that the pressing pressure obtained when the pressure lever 4 is away from the stopper pin 7 is a desired value, the pressure lever 4 can be moved slightly near the stopper pin 7. You can arbitrarily select between a zero pressing pressure state and a desired pressing pressure state by simply moving the button.

In the above embodiment, the pressure lever 4 and the wiper arm 3 are pivotally supported on the fixed member 2 by one support shaft 22, but as shown in FIG.
They may be provided separately from the supporting shaft 22 and positioned eccentrically.

In this case, as shown in FIG. 6, the acting force of the coil spring 5 is not completely canceled out as an internal force at the position where the pressure lever 4 and the wiper arm 3 contact each other, and a friction peak occurs due to the contact between the two. The pressing pressure decreases by the same amount.

In the above embodiment, the stopper pin 7 is provided on the wiper arm 3 as a contact part, but the shape of the pressure lever 4 is changed so that a part of it contacts the wiper arm 3 at a predetermined position.
Alternatively, a portion of the link 31 may come into contact with the pressure lever 4 at a predetermined position.

[Effects of the Invention] In the present invention, a contact portion is provided on either the wiper arm or the pressurizing lever so that the two contact each other at a predetermined position, so that when not in use, the wiper blade is pressed by bringing them into contact with each other. The durability of the wiper blade is improved by making the pressure sufficiently small, and when in use, the pressing pressure of the wiper blade is maintained at a specified level by displacing the pressure lever unevenly from the contact position to eliminate the contact state between the two. The pressure can be increased stepwise.

Thus, according to the present invention, the pressing pressure can be greatly changed simply by slightly displacing the pressure lever, and the device can be downsized by reducing the operating stroke of the pressure lever.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a sectional side view of a wiper device, a sectional view taken along line I-I in FIG.
The figure is a plan view of the wiper device, FIG. 3 is a pressing pressure characteristic diagram of the wiper blade, FIG. 4 is a schematic diagram of the wiper device, and FIG.
6 and 6 show another embodiment of the present invention, FIG. 5 is a sectional side view of the wiper device, and FIG. 6 is a pressing pressure characteristic diagram of the wiper blade. 1... Pivot shaft 2... Fixing member 22... Support shaft 23... Support shaft 3... Wiper arm 4...・Pressure lever 5... Coil spring (spring member) 6
... Piston (driving means) 7 ... Stopper pin (contact part) Fig. 3 Fig. 4

Claims (1)

[Claims] A fixed member is provided on a pivot shaft that rotates reciprocally and rotates integrally with the pivot shaft, and one end is pivotally supported by the fixed member and is rotatable in a direction perpendicular to the rotating surface of the fixed member, and a wiper blade is attached to the other end. a wiper arm to be held; a pressurizing lever that is pivotally supported by the fixed member and rotates and changes the tension of a spring member tensioned between the wiper arm and the wiper arm according to the rotational position; and the pressurizing lever. A wiper device comprising a driving means for rotationally driving a lever, and increasing or decreasing the pressing pressure of the wiper blade by rotating the pressure lever, the wiper device having a drive means for rotationally driving the lever, the wiper device having the wiper arm and the pressure lever both at a predetermined position. A wiper device for an automobile, characterized in that it is provided with a contact portion that makes contact with the wiper device.