JPS61238547A - wiper arm device - Google Patents

Abstract

PURPOSE:To reduce the thicknesswise dimension of a wiper arm device, by couling a spring seat slidably supported to the casing of the wiper arm device, with a support through the intermediary of a link. CONSTITUTION:A spring seat 21 is fixed to the casing 13, and a spring seat 22 is supported to the casing 13, slidably in the longitudinal direction of the latter. In this arrangement a coupling pin 27 receives a force in the direction P1 by means of a coil spring 20, the acting line of the force passing below the coupling pin 18 so that a link 28 is rotated counterclockwise abut the pin18 as a center.Then, the casing 13 is rotated counterclockwise about the axis 17 as a center through a bracket 25, and therefore, a wiper blade jounalled to the front end of the support 14 is pressed against an window glass pane.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a wiper arm device that supports a wiper blade and wipes a window glass surface.

[Background of the invention]

FIG. 8 is a perspective view showing an example of a conventional wiper blade device, in which a support 2 fixed to a rotary drive shaft 1 is reciprocated as indicated by a reciprocating arrow AA'. This support 2
is case 3. A wiper blade 5 is supported via a support plate 4, and wipes the windshield 6 while keeping the wiper blade 5 substantially perpendicular to the window glass.

The case 3 is pivoted to the support 2 by a shaft 7, and a spring (
It is hidden in this figure. (described later with reference to FIG. 9), the wiper blade 5 is pressed against the windshield 6 by this rotational urging force.

FIG. 9 is a sectional view of the vicinity of the case 3 in an example of a conventional wiper arm device. The case 3 supporting the wiper blade needs to be biased in the counterclockwise direction in the figure as shown by arrow B around the shaft 7 so as to press the wiper blade against the windshield during normal operation, and When it is raised as shown by arrow C for inspection and maintenance, it is desirable that it maintains its position as shown by the imaginary line 3'.

In the conventional example shown in FIG. 9, a tension spring 10 is interposed and engaged between a spring hanger 8 provided on the support 2 and a spring hanger 9 provided on the case 3, and the tension spring 10 is attached to the spring hanger 9 in the direction of arrow T1. It adds the power of When the case 3 in the normal operating position shown by the solid line receives a force in the direction of the arrow T1, the line of action of this force, the arrow T1, passes below the pivot shaft 7 of the case 3, so the case 3 rotates counterclockwise as shown in the figure. receive a directional force. Also, the spring hanger 9' of the case 3' in the raised position (imaginary line) is shown by the arrow T.
Receives forces in two directions. Since the line of action of this force passes through the right side of the pivot shaft 7, the case 3 receives a force in the clockwise direction in the figure, and the case 3' comes into contact with the flange portion 2a of the sabots 1 and 2. and save that posture.

In this way, since the structure is such that the tension spring 10 is turned over beyond its dead center, the hook 11 is bent in a dogleg shape so that the tension spring 10 does not interfere with the pivot shaft 7. It is interposed between the tension spring 10 and the spring ring hanger 8.

The conventional wiper arm device (FIG. 9) configured as described above has a problem in that the thickness dimension H of the device is large. (For example, Utility Model Publication No. 58-149243#.

(Refer to branch number 83-12590) In order to solve the above-mentioned problem and construct a thin wiper arm device, a compression coil spring 10' is installed between the support 2' and the case 3', as shown in FIG. A configuration has been proposed in which the intervening
issue). According to this invention, the thickness dimension H' of the device can be configured to be relatively small, but when the case 3' is raised, the axis of the compression coil spring 10 is subjected to an unreasonable external force in the form of bending. This is unfavorable from the standpoint of device reliability and durability, and has the disadvantage of unstable operation.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and allows the thickness of the device to be reduced, and furthermore, the spring is not subjected to unreasonable force in the direction of bending its axis, and its operation is stable and highly reliable. The present invention aims to provide a wiper arm device.

[Summary of the invention]

In order to achieve the above object, the wiper arm device of the present invention includes a support plate that supports the wiper blade and presses it almost perpendicularly to the windshield, and a case fixed to the proximal end of the port plate as indicated by -. , a wiper arm device comprising a support that rotates back and forth, the case being rotatably supported on the support, and a spring provided in the case applying rotational force to the case; A spring seat fixed to a case, a spring seat slidably supported in the longitudinal direction of the case, and a coil spring compressed and interposed between both of the spring seats, and the slidable spring It is characterized in that the seat and the support are connected by a link. However, in the present invention, the support plate is fixed to the tip of the case and directly connects the wiper blade.

A general term for arm members supported at joints, regardless of whether they are plate-shaped or rod-shaped in appearance.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a sectional view of one embodiment of the wiper arm device of the present invention, and corresponds to FIGS. 9 and 10 in the above-mentioned known example. Figure 2 is a view from the ■ arrow in Figure 1.
The figure is a sectional view taken along the line mm in FIG. 2.

A case 13 is pivotally supported on a support 12 by a single shaft 17.

12a is a stopper portion provided on the support 12, and 14 is a support plate fixed to the tip of the case 13.

A pair of spring seats 21 and 22 are configured, and the spring seats 21 and 22 are fixed to the case 13, and the spring seats 22 are slidably supported in the longitudinal direction of the case 13 as described below. A coil spring 20 is compressed and interposed between spring seats 21 and 22.

The spring seat 22 of this embodiment is a coil spring 20
The connecting bracket 24 is integrally connected to the guide shaft 23 which is inserted through the guide shaft 23 .

On the other hand, the base end of the support plate 14 (right end in the figure)
The side is extended to pass through the spring seat 21, and the end thereof is inserted into the coil spring 20 so that it also serves as a guide shaft.

A guide bracket 25 is fixed to the case 13. This guide bracket 25 has a case 1 as shown in FIG.
Three longitudinal slots 26 are provided.

The connecting pin 27 is connected to the bracket 24. It is inserted through the link 28° and the slot 26, and its both ends are crimped, supporting the bracket 24 integral with the spring seat 22, and guiding the case 13 so as to be slidable in the longitudinal direction.

The other end of the link 28 is pivoted to the support 12 by a connecting pin 18.

As shown in FIG. 1, the connecting pin 27 is connected to the arrow P! by the coil spur ring 20. The link 28 receives a force in the direction of force, and since the line of action of this force passes below the connecting pin 18, the link 28 receives a rotational force in the counterclockwise direction in the figure about the connecting pin 18. When the link 28 tries to rotate counterclockwise, the case I3 receives a counterclockwise rotation force about the shaft 17 via the bracket 25, and the wiper blade supported at the tips of the support plays 1 to 14 is rotated to the windshield. Press it against the glass (none of which are shown).

When the above-mentioned case J3 is pulled clockwise in the figure by applying a hand force so that the urging force PO of the coil spring 20 passes through the connecting pin I8 as shown in Fig. 4, the case 13 receives the rotational force. It disappears. Then, the state shown in Figure 4 (
When the case 13 is further pulled up after passing the dead point 1-), it becomes as shown in FIG. It comes into contact with the stopper portion 12a under the rotational force in the rotational direction, and is held in that position.

In this embodiment (Fig. 1 to Fig. 5), there is no risk of interference between the pivot shaft of the case and the spring as in the conventional example (Fig. 9) using a tension spring, so the conventional example There is no need to provide the hook member 11 as shown in FIG. Since the coil spring 20 receives only pure compressive force and is not subjected to excessive external force in the direction of bending the axis, there is no risk of unstable operation or damage to reliability and durability.

6 and 7 show an embodiment different from the above, FIG. 6 is a sectional view corresponding to FIG. 1 in the previous example, and FIG.
FIG. 3 is a partially cutaway bottom view when the figure is viewed in the direction of the arrow ■. Supports 12. with the same drawing reference numbers as in the previous embodiments. Case 13. Axis 17. Compression coil spring 20. Movable side spring seat 22. and the link 2B are the same or similar components as in the previous embodiment.

The structural members shown with reference numbers in the drawings in the above embodiments correspond to the structural members in the above embodiments, but are different as described below.

A slot 26' is provided in a link connecting bracket 24' that is integrally connected to the spring seat 22 on the movable side, and both ends of the guide pin 29 inserted through this slot 26' are inserted into the bracket 2.
It is fixed at 5. The link connection bracket 24
' is connected to the link 28 by a connecting pin 27'.

The support plate 14' in this example does not penetrate through the bracket 21' on the fixed side, but instead extends the guide shaft 23' integrally connected to the bracket 22 on the movable side compared to the previous example, so that the bracket 21' on the fixed side It is slidably fitted into a through hole 30 provided in the hole 30.

Even with this configuration, the same operation and effect as the previous example can be obtained.

〔Effect of the invention〕

As detailed above, the wiper arm device of the present invention includes:
A spring seat fixed to a case and a spring seat slidably supported in the longitudinal direction of the case are provided to compress a coil spring, and the slidable spring seat is linked to the support. By connecting the coil spring through the wire, the thickness of the device can be reduced, and since no unreasonable force is applied to the coil spring to bend its axis, the operation is stable and highly reliable. It has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an eleventh embodiment of the wiper arm of the present invention, Fig. 2 is a view taken along the ■ arrow in Fig. 1, and Fig. 3 is a cross-sectional view of Fig.
The sectional view, FIGS. 4 and 5 are explanatory views of the operation of the above embodiment. FIG. 6 is a cross-sectional view of an embodiment different from the above, and FIG. 7 is a partial cross-sectional view taken in the direction of the arrow ■ in FIG. Fig. 8 is an external perspective view of a wiper arm device, Fig. 9 is a sectional view of an example of a conventional wiper arm device using a tension spring, and Fig. 10 is a sectional view of a known wiper arm device using a compression coil spring. It is a diagram. 2... Support, 3... Case, 4... Support plate, 10... Tension spring, 10'.
...Compression coil spring, 12...Support, 13
...Case, 14°14' ...Support plate, 20...Coil spring, 21...Fixed spring seat, 22...Slidably supported spring seat, 23.23' ...Guide shaft, 24°24'
...Connection bracket 1-125...Guide bracket 1-125'...Bracket, 26.26'...
・Slot hole, 28...link. Patent applicant Nissan Motor Co., Ltd. Ichikoh Industries, Ltd.

Claims (1)

[Claims] It consists of a support plate that supports the wiper blade and presses it almost vertically against the windshield, a case fixed to the base end of the support plate, and a support that rotates back and forth. In a wiper arm device that is rotatably supported on a shaft and in which rotational force is applied to the case by a spring provided in the case, the wiper arm is supported so as to be slidable in the longitudinal direction of the case and a spring seat fixed to the case. A wiper arm characterized in that a coil spring is compressed and interposed between the two spring seats, and the slidable spring seat and the support are connected by a link. Device.