JPS5929547A - Wiper blade - Google Patents

Abstract

PURPOSE:To normalize the contact pressure of a wiper blade the connecting section between a vertebra and a blade lever in the neighborhood of the central part in the longitudinal direction of the vertebra is formed such that the relative movement of the blade lever and the vertebra is suppressed. CONSTITUTION:Two blade levers 11 and 12 are slidably coupled with a vertebra 15 by claws 11A and 12A. The levers 11 and 12 receive the forces produced when the claws 11A and 12A come near the glass face by a torsion spring provided to the hinged part 13. Notches 15A and 15B are formed places near the central part in the longitudinal direction of the vertebra 15, and the claws 14A and 14B of the blade lever 14 are coupled with the notches 15A and 15B. The relative movement in the longitudinal direction of the lever 14 and the vertebra 15 can therefore be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper blade, and particularly to a wiper blade of a type in which a blade rubber and a blade lever are connected via a vertebra.

In the conventional wiper plate 9 of this type, a notch is provided at one end of the vertemirra in the longitudinal direction, and a pawl at one end of the blade lever is engaged with the notch to suppress relative longitudinal movement. The claws were slidably engaged with the vertepla in the longitudinal direction to accommodate the curvature of the glass surface to be wiped [2] and to allow the plaid rubber to curvature. This configuration has the advantage that it is easy to attach a clip that prevents relative movement of the plaid rubber in the longitudinal direction to the vertebra or the claw that engages with the notch thereof.

On the other hand, in order to improve the wiping effect of the wiper plate and reduce wear on the blade comb, it is necessary to equalize the contact pressure along the length of the blade rubber, and various measures have been taken for this purpose. Among these, increasing the number of pressure supports by increasing the number of levers complicates the structure and increases costs, and the sufficient effect cannot be obtained. There is a defect in that the tracking ability for the degree of curvature of the glass deteriorates in the vicinity. It has been proposed that the rigidity of the vertepla be varied along its length to prevent the drop in trailing performance near both ends, but this has the disadvantage of complicating the structure.

An object of the present invention is to obtain a wiper blade in which the contact pressure is leveled without increasing the number of levers of the blade lever, that is, the number of fulcrums, and without particularly increasing the rigidity of the vertebrae.According to the present invention, A wiper blade having the above-mentioned configuration is provided, which suppresses relative movement in the longitudinal direction between the large blade lever and the vertebra at at least two joints in the longitudinal center portion of the vertebra among the joints between the large blade lever and the vertebra. be done.

FIG. 1 shows an example of a conventional wiper blade, and the play lever is made up of two levers 1 and 2 connected by a hinge pin 6, with claws 1A, 1B, 2A of each lever,
One of the claws 2B engages with the cutout groove 5A of the vertebra 5 to prevent relative movement in the longitudinal direction, and the remaining claws are slidably attached.

The distribution of contact pressure between the plate 9 and the glass surface when a force is applied in the direction of the arrow is shown in Figure 1←→.The contact pressure is high at the winter melon position, and the contact pressure is low in the middle. This caused uneven wiping and abnormal wear of the blade rubber.

In order to eliminate this drawback, it was considered to increase the number of levers as shown in FIG. 2, but it was still impossible to level out the contact pressure distribution.

FIG. 6 shows a first embodiment of the invention, in which the two levers 11, 12 are slidably engaged with the bar tipper 15 by means of pawls 11A, 12A, and each is engaged by a torsion spring provided in the hinge portion 16. The claws 11A and 12A are receiving force in a direction toward the glass surface. Bartemira 15
Notches 15A and 15B are provided near the center in the length direction, and the pawls 14A and 14B of the sixth lever 14 engage with the notches 15A and 15B, respectively, so as not to move relative to each other in the length direction. ing. The contact pressure distribution is shown in FIG. 6 (b), and it can be seen that it is significantly improved compared to tLl in FIG. 1.

In the case of FIG. 6, the claws 14A, 14B of the lever 14 are shown to be engaged with the notches 15A, 15B of the vertemirror 15, but the lever 14 and vertepla 15 may be fixed together.

In the embodiment of FIG. 4, the pawl 21A of the lever 21.22,
22A is slidably engaged with the vertemirra 25, and the lever 2
1. The other ends 21B and 22B of 22 are respectively levers 24.
26, the levers 24.26 each
4A, 24B, 26A.

26 It is fixed or integrally connected to the vertebra 25 at the position B.

In addition, although the parts shown as 21' and 22' in FIG. 4 have been described as being integrated with the levers 21 and 22, respectively, they may be separate parts, and if they are separate parts, they should not be attached to the common hinge part 26. The lever 22.21 may be hinged at a mid-length position.

[Brief explanation of the drawing]

Fig. 1 (a) is a side view of a conventional wiper blade, Fig. 1 (b) is a partial perspective view showing the state of connection between the vertepla and the lever, Fig. 1 () → is a graph showing the contact pressure distribution, Figure 2 is a side view 1 showing another form of a conventional wiper blade.
and contact pressure distribution diagram. FIG. 6(a) is a graph showing the wiper route contact force distribution according to the present invention, FIG. 6(a) is a plan view of the vertebrae, and FIG. 4 is a side view showing a modified example. 1, 2, 1', 2', 7, 8, 11, 12, 14
, 21. 22, 24.26 are levers, iA, IB, 2
A, 2B. 1'A, 2'A, 7A, 7B, 8A, 8B, 11A, 1
2A. 14A, 14B, 21A, 22A, 24A, 24B. 261 and 26B are connecting portions, 5, 15.35 are vertical plastics, 3, 13.23 are hinge portions, and 6 is plate 9 rubber.

Claims (1)

[Claims] (+) Flaed Rubber and Plaid Lever In a wiper plate that is connected via a tow vertebra, the blade lever is connected to the vertebra at at least two joints near the longitudinal center of the vertebra among the joints between the blade lever and the vertebra. A wiper plate characterized in that it is configured to suppress relative movement in the longitudinal direction of the wiper plate.