JPS60161238A - Wiper device for car - Google Patents

Abstract

PURPOSE:To maintain the strength of a coupling part, by a method wherein U- shaped link, positioned astride an arm head, is pivotally secured closer to the wiper pivot side than to a retainer coupling part at the side of the free end part of the arm head of a wiper and in a position where it is offset in a level lower than that of the coupling part. CONSTITUTION:A retainer 3 is formed in a short size, and meanwhile, a link member 11 is formed in an elongated U-shape being long enough to allow it to extend astride the retainer 3, the coupling part of the retainer 3, a spring 8, and the surrounding of a link member 11 mounting part are covered with a cover 13 of a resin material, formed in a U-shape in cross section. The end of an arm piece 6 is caulked to the upper surface of the retainer 3 by means of a pin 7, a bracket 4 is caulked to the under surface of the middle part of the arm piece 6 by means of pins 15, and the end of the spring 8 is engaged with the bracket 14. The resin cover 13 is forced into resilient frictional engagement with the sides of the arm piece 6, and the link member 11 is contained and concealed at the interior of the side wall of the rear end part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automobile wiper device, and more particularly to a spring arrangement structure for biasing a wiper blade toward a windshield surface.

Prior Art Fig. m1 shows a wiper device that is commonly used.l is an arm head that is fitted into the wiper device ('w-p) and fixed with a nut, and the free end of the arm head is The bracket part 2 is integrally molded. 3 shows a retainer which is connected to the bracket part 1 so as to be rotatable in the vertical direction by a pin 1, and to this retainer 3, an f-piece t which holds a wiper blade (not shown) is fixed and connected to a pin 7 by caulking. It is. ♂ is arm head/
and the retainer 3 side, for example, the bracket part 6a of the arm piece 6@, and is a spring that biases the tip side of the retainer 3 downward and presses the wiper blade against the windshield surface (not shown). The other end of this spring is hooked to a pin located below the connecting pin of the bracket part λ of the arm head and at a position offset to the wiper pivot (W-P) side. It is tethered to. In the case of the wiper device, in order to facilitate the wiper blade replacement work or to prevent the wiper blades from being buried due to snowfall, the unit on the tip side of the retainer 3 is lifted up from the windshield surface. It is required that it can be maintained.

For these reasons, if the aforementioned hook member IO is straight as shown by the chain line l0IL in FIG.
Alternatively, the hook member 10a may interfere with the bracket portion 2, making it impossible to rotate the retainer 3 upward. Therefore, the hook member 10 is usually bent into a dogleg shape or an arc shape, as shown by the solid line in the figure, to prevent the hook member io from interfering with the bracket part 2 when the retainer 3 rotates upward. That's how it is. However, when the hook member is bent and molded in this way, the vertical dimension of the wiper device becomes very large, which obstructs the forward visibility, and especially when using a concealed wiper specification, the layout of the circumference of the wiper device mounting part becomes very difficult. It becomes difficult. In addition, S in FIG. 1 indicates a bush.

Therefore, as shown in Japanese Utility Model Application Publication No. 58-122845, a slit is formed in the center of the tip of the bracket part of the arm head, and when the retainer rotates upward, the hook member or spring connection vjIflII end is formed. A device has been proposed in which the part can pass through this slit.

However, if a slit is formed in the bracket part of the arm head in this way, the connection part between the bracket part and the retainer will be divided into left and right parts, which will reduce the strength of the connection part and cause the connection part to be damaged. The resulting torsional load causes looseness and shudder of the wiper blade; the windshield surface cannot be properly wiped, and the wiper blade rides on the pillars on the side of the windshield, damaging the blade rubber. This will cause problems. (9) Apart from these functional problems, since the connecting part is divided into left and right parts, it is necessary to improve the centering accuracy of this left and right connecting part, which makes processing management very difficult.) It also becomes a factor that inhibits productivity.

OBJECTS OF THE INVENTION In view of the conventional situation, the present invention provides a wiper device for an automobile that can hold a retainer upright without increasing the height dimension of the device or reducing the strength of the connecting portion between the arm head and the retainer. The purpose is to provide the following.

Structure of the Invention In order to achieve the above-mentioned object, in the present invention, the retainer connecting portion on the side surface of the protruding end of the arm head is also located on the wiper pivot side, and the connecting portion is also located at a position offset downward. A U-shaped link member that straddles the free end of the arm head is rotatably mounted, and a spring that biases the tip end of the retainer downward is stretched between the end of the link member and the retainer side.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

That is, in the present invention, as shown in FIG. 2.8, the arm head/free end portion connected to the wiper pivot,
Specifically, the retainer 3, which is connected to the arm piece jt that holds the wiper blade, is connected to the bracket part λ so as to be rotatable in the vertical direction by means of a pin, and the arm head/ and the bracket part at the end of the arm piece 6 are connected to the bracket part λ. The retainer connecting pin 4'jC on the side of the bracket part λ of the arm head/ is also on the wiper pivot side, and , the connecting pin L] is also rotatably attached with a pin 12 to a U-shaped link member that straddles the U end of the bracket at a position offset downward, and the end of the spring ♂ on the arm head side is attached. This link member // is tethered to the end thereof.

In this embodiment, the link member /'/ has a hook part // at the rear end.
A is formed so that it is removably engaged with the pin L, but it may also be fixedly pivotally attached to the pin J. In particular, if the link member // is detachably attached as in this embodiment, there is an advantage that it can be easily applied to existing wiper devices.

According to the above embodiment structure, the bracket portion of the arm head l is not divided into left and right parts, so the connection portion of the retainer 3 by the pin V maintains high connection strength as in the conventional structure shown in FIG. This allows it to sufficiently resist torsional loads without causing galling. On the other hand, when the retainer 3 is rotated upward together with its distal end member, the link member /l rotates together with the rotation of the retainer 30, but this link member ii Since the retainer 3 is formed in a straddling U-shape, it can freely rotate relative to the bracket section C. During the rotation process of the retainer 3, the link member /
The bottle support point P1 of / and the bracket s1 of the spring and arm piece B. When the line connecting the connecting part P and the connecting part P, that is, the axis of the spring r, crosses the pin support point of the retainer 3, the biasing force of the spring ♂ changes counterclockwise in the figure, and the end of the retainer 3 is The retainer 3 can be held upright by being press-fitted onto the bracket part λ.

In the embodiment shown in FIG. 5.6, the retainer 3 is formed short, and the link member // is formed in a long U-shape so as to straddle this retainer 3, and the link member 3 is connected to the spring 3. The periphery of the link member//attached portion is covered with a cover/j made of a resin material and having a substantially U-shaped cross section. Since the end of the arm piece B is caulked and fixed to the upper surface of the retainer 3 with a pin 7, a bracket/Hiro is caulked and fixed to the lower surface of the middle of this arm piece O with a pin 15), and this bracket)/4L is fixed. The end of spring r is connected. The resin cover 13 is attached such that its distal end is elastically engaged with the side edge of the arm piece t so that it will not come off, and the link member /l is housed and concealed inside the side wall of the rear end.

This embodiment is also functionally completely similar to the embodiments shown in FIGS. 2-4.

Effects of the Invention As described above, according to the present invention, the height dimension of the device, specifically, the height dimension around the connecting portion between the arm head and the retainer does not increase, and the connecting portion The present invention has a great practical effect in that the retainer can be held upright without impairing its strength, and the conflicting problems of conventional devices can be simultaneously satisfied.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the conventional structure, #! Fig. 2 is an exploded perspective view showing essential parts of an embodiment of the present invention, Fig. 8 is a perspective view of the assembled state seen from below, Fig. 4 is an explanatory view showing the operating mode, and Fig. 5 is an exploded perspective view of the present invention. 6th partially exploded perspective view of different examples of
The figure is a perspective view showing the assembled state. /... Arm head, λ... Arm head free end (bracket part), 3... Retainer, V... Connection pin, 6... Arm piece, t... Spring, //
...Link member.

Claims (1)

[Claims] (1) A retainer to which an arm piece for holding a wiper blade is connected is connected to the free end of the arm head connected to the wiper pivot so as to be rotatable in the vertical direction. The structure includes a spring that biases the distal end side of the arm downwardly, and the arm is located at a position closer to the wiper pivot than the retainer connecting part on the side of the arm head, and also offset downward from the retainer connecting part. A wiper device for an automobile in which a U-shaped link member is rotatably mounted to straddle the protruding end of the head, and the spring is stretched across the end of the link member and the retainer side.