JPS6232122Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an over-rotation prevention device for blades of pantograph wiper devices used in automobiles and the like.

When a wiper device is used on a light vehicle or motorcycle, it is installed in a position that is easily accessible to people. Therefore, there are many cases where a person accidentally or carelessly touches the blade and rotates the blade, causing the angle of the blade with respect to the arm to deviate from the set normal angle range. If the wiper device operates at an angle that is different from the set angle, not only will it not be possible to obtain the desired scrubbing function, but if the wiper device is operated at an angle that is different from the set angle, a load greater than the set value will be applied to the drive of the wiper device. This may cause serious damage to the motor, such as burnout of the motor. In addition, it is assumed that in addition to human action, force majeure such as gusts of wind during driving may cause a load higher than the design value and cause the blade setting angle to change. An anti-rotation device was required.

In view of the above points, it is an object of the present invention to provide a pantograph-type wiper device in which the set position of the blade is always secured, has good operability, and has good durability.

The feature of this invention is that by extending the length of the normally used connecting shaft,
The extension of this shaft protrudes during the movement of the arm and substay, exerting a large stopping force.

Next, embodiments of the present invention will be explained based on the drawings. FIG. 1 is an overall explanatory diagram of a pantograph wiper device according to the present invention, in which a blade 2 for slidingly cleaning a windshield 1 is rotatably connected to an arm 5 by a shaft 4 via a swivel 3.
The arm 5 is rotatably connected to an arm head 7 and a shaft pin 8 via a holding guard 6, and a coil spring is built in the holding guard to form an arm shank. A drive motor shaft 11 is inserted into a shaft hole 10 formed in the arm head 7 and connected to a drive motor 13 via a bracket 12.
performs reciprocating rotational motion within a predetermined angle around the motor shaft 11. On the other hand, substay 14
is also rotatably connected to the swivel 3 by the shaft 15, and the arm 5 and substay 14
is interlocked through the swivel 3, causing the blade 2 to perform a predetermined reciprocating sliding movement. substay 14
The joint outer 16 at the bottom of the joint ball shaft 1 protrudes from the motor housing.
The sub-stay 14 is supported by a ball bearing structure on the sub-stay 7 and is movable three-dimensionally.

As shown in FIG. 2, according to the present invention, the shafts 4 and 15 are made longer than usual, and protrude on a certain mutually parallel plane (indicated by broken lines) where at least the arm 5 and substay 14 exist. ing. Also, as shown in Figures 3a and b, L
A blade 2 is fixed to one end of a letter-shaped swivel 3, and a substay 14 is rotatably connected to the other end with a bearing interposed therebetween. An arm 5 is attached to the corner portion of the L-shaped swivel 3.
are similarly rotatably connected via a bearing, and the arm 5 supports the sub-stay 14 to cause the blade 2 to perform a predetermined reciprocating sliding movement.

Next, the operation of preventing over-rotation of the blade 2 according to the present invention will be explained. As shown in FIG. 2, the arm 5 and the substay 14 move parallel to each other on the fixed plane, but on each plane, the arm 5 hits the shaft 15, and the substay 1
4 corresponds to the shaft 4 and limits the rotation range of the blade 2. In FIG. 3a, when a force is applied to the blade 2 to rotate it in the direction of arrow A, the shaft 15,
The arm 5, substay 14, shaft 4, etc. begin to move parallel to each other on their respective fixed planes, but in the process of parallel movement, the shaft 15 moves along the arm 5.
When this happens, the robot can no longer move in the same direction, and the series of operations stops. The rotation of the blade 2 in this direction is therefore stopped. On the other hand, when a force is applied to rotate the blade 2 in the direction of arrow B opposite to that described above as shown in FIG. stops, and at the same time, the rotation of the blade 2 in the B direction stops. Through the above-described operations, the arm and the substay mutually contact the shaft used to connect the other, thereby restricting the rotation of the blade.

As described above, according to the present invention, it is possible to obtain a pantograph-type wiper device that can prevent unnecessary over-rotation of the blade and has excellent operability and durability in which normal sliding movement can always be expected.

[Brief explanation of the drawing]

Fig. 1 is an overall explanatory view of the pantograph wiper device as seen from the side, Fig. 2 is a detailed view of the swivel connection, and Figs. 3a and 3b are schematic diagrams illustrating the operation to prevent over-rotation of the blade. In the plan view, Fig. 3a shows the case when rotating to the left, and Fig. 3b shows the case when rotating to the right. Explanation of symbols, 2: Blade, 3: Swivel,
4: Shaft (for arm connection), 5: Arm, 1
4: Substay, 15: Shaft (for substay connection)

Claims (1)

[Scope of utility model registration request] A first blade that cleans a windshield etc. by sliding it back and forth; and a first blade each having a protrusion.
In a pantograph wiper device, the pantograph wiper device includes an arm and a substay that are rotatably connected to each other by a shaft and a second shaft and mutually support the blade, and a drive section that drives the arm, wherein the second shaft protrudes from the arm. A pantograph type wiper device, characterized in that the first shaft protrusion functions as a stopper for the sub-stay, and limits the rotation angle of the blade within a desired range.