JPS5852853B2 - window wiper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a windshield wiper, and particularly to the configuration of a connecting portion between a wiper arm and a yoke.

In the windshield wiper known from German Publication No. 2 642 953, a locking spring made of plastic with two legs is fixed in a central position on a shaft by means of bolts suspended on both sides of the yoke. .

Furthermore, the engagement cams, which are elastically curved by external forces, protrude only slightly beyond the lower edges of both side walls of the yoke.

In this case, if the engagement cam has a sufficient height to sufficiently engage the wiper arm,
A large force is required to engage and fix the wiper arm with the locking spring.

Also, if the engagement cam does not have sufficient height,
Although the engagement of the wiper arm with the locking spring is simplified, it does not provide a sufficiently reliable engagement over long periods of time.

This invention has been made based on the above circumstances, and it is possible to facilitate the engagement work of the wiper arm to the locking spring, and to ensure that the wiper arm is stably and sufficiently connected to the locking spring even after long-term use. It is an object of the present invention to provide a windshield wiper that can maintain a properly engaged state.

The object of the present invention is to provide a yoke and a U-shaped locking spring which has a curved part into which a hook-shaped end of a wiper arm is fitted and is rotatably connected to a shaft installed between both side walls of the yoke. a guide web provided on the locking spring and extending along both side walls of the yoke to guide the wiper arm; and a guide web provided on the guide web and formed to protrude inward within the range of the outer peripheral surface of the curved portion of the locking spring. and an engaging cam with an outer circumferential surface of the locking spring, the center of which is located between the outer circumferential surface of the locking spring and the shaft of the yoke. can do.

With such a configuration, when the yoke is fitted into the locking spring, the engaging cam can be made to protrude more downwardly from the lower edges of both side walls of the yoke than in the conventional example. The engaging cam can be elastically curved outward compared to the conventional example.

Therefore, compared to the conventional example, even if the height of the engagement cam is increased to ensure that the wiper arm is retained in the locking spring for a longer period of time, a large force is required to engage the wiper arm with the locking spring. This simplifies the engagement between the wiper arm and the locking spring, and when the windshield wiper is used, the guide web on which the engaging cam is provided runs along both side walls of the yoke, so it can be used for a long time. A sufficiently reliable engagement can be provided even after use.

Further, in the windshield wiper of the present invention, the locking spring has two parts extending along the husband and wife of the guide web within the range of the outer peripheral surface of the curved part of the locking spring.
Preferably, it has two slots.

With such a configuration, the force required for the engagement described above can be further reduced.

An embodiment of the present invention will be described below with reference to the drawings.

The windshield wiper of this embodiment includes a yoke 10 having parallel side walls 11, 12 and a web 13.

In the space 14 formed between the side walls 11.12, a shaft 15 formed by a bolt installed on the side walls 11.12 is arranged, and a locking spring 20 made of a plastic material is attached to this shaft 15. They are rotatably engaged and fixed.

The locking spring 20, as shown in an enlarged view in FIG.
It is provided with two legs 21, 22 for guiding the 6.

When the windshield wiper is activated, the guide webs 23, 24
As shown in FIG.
is supported in duplicate on the inner surface of the

The outer peripheral surface S of the curved part connected to the two leg parts 21 and 22
Engagement cams 25, 26 projecting inward are provided on the inner surfaces of the guide webs 23, 24, which extend beyond the outer circumferential surface S from within the range.

In order to engage the wiper arm 16 with the locking spring 20, these engagement cams 25, 26 are elastically bendable in the direction of an external force, as shown by the arrows in FIG.

Center point M of curvature of the outer peripheral surface S of the curved part of the locking spring 20
A recess 30 for the shaft 15 is provided eccentrically from the shaft.

When the wiper arm is installed as shown by the dashed line in FIG. 1, that is, when the wiper arm is engaged with the locking spring,
, 26 project downwardly from the yoke 10 together with guide webs 23, 24 from the outer circumferential surface S to the engaging cams 25, 26.

Therefore, when the end of the hook-shaped wiper arm 16 is pressed onto the outer peripheral surface S of the locking spring 20, the engagement cam 25.
26 can each be easily bent outwardly.

The center of curvature M of the outer peripheral surface S of the curved part, the recess 30 and the axis 1
The predetermined distance A between the common center axis of the yoke 10 and the common central axis of the yoke 10 is such that when the wiper arm 16 is installed, the portions of the guide webs 23 and 24 within the range from the engagement cams 25 and 26 to the outer peripheral surface S of the curved portion are on both sides of the yoke 10. From the axis 15, the side walls 11,
The value obtained by adding the distance from the center of curvature M to the outer circumferential surface S to the predetermined distance A must be determined to be larger than the distance E to the lower surface 17 of 12.

As best shown in FIG. 4, the locking spring 20 has two
It has two slots 32 and 33.

With such a shape, the predetermined movement of the engagement cams 25 and 26, that is, the bending in response to an elastic external force, becomes easier as shown by the curved line B shown by the broken line in FIG. , the guide webs 23, 24 are on both side walls 1 of the yoke 10.
1.12 can easily be duplicated.

When the engagement cams 25, 26 are bent outward, the slots 32, 33
The guide webs 23, 24 in the area of curved line B in FIG.
As shown, it curves inward to form a convex shape.

As shown particularly well in FIG. 3, the inner surface of the recess 30 on the outer peripheral surface S side is cut out to form a groove 34, and the remaining inner surface of the recess 30 on the outer peripheral surface S side is cut out. The portion acts as a stop 35.

Therefore, the locking spring 20 is not fitted too deeply into the shaft 15.

Due to the presence of the slot 34, when the locking spring 20 is engaged with the shaft 15, the legs 21, 22 can be separated from each other with a sufficient distance to accumulate elastic force, so that the groove Hole 34 is important.

As shown in FIG. 3, the engagement cam 25 has a contact surface 39 that is curved at the top and extends linearly at the bottom.

Such a shape is important in processing, and with such a shape, when the locking spring 20 is formed from a plastic material, the locking spring 20 can be extracted from the mold very easily.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of one embodiment of the present invention, Fig. 2 is a plan view seen from the direction of the arrow shown in Fig. 1, Fig. 3 is a vertical cross-sectional view of the locking spring, and Fig. 4 is a view of the third anchor. FIG. 5 is a plan view seen from the direction of the arrow ■ shown in FIG. 3, and FIG. 5 is a side view seen from the direction of the arrow V shown in FIG. 10... Yoke, 11... Side wall, 12
...Side wall, 15...Axle, 16...
...Wiper arm, 17...Bottom surface, 20...
... Tatsuking spring, 21 ... Foot section, 22 ...
...Foot, 23...Guidance web, 24...
...Guide web, 25...Engagement cam, 26
...Engagement cam, 32...High tide L33.
...Slot hole, A...Predetermined distance, E...
...Distance, M...Curvature center point, S...
Outer surface.

Claims (1)

[Scope of Claims] 1. A U-shaped locking spring that has a yoke and a curved portion into which a hook-shaped end of a wiper arm is fitted, and is rotatably connected to a shaft installed between both side walls of the yoke. a guide web provided on the locking spring and extending along both side walls of the yoke to guide the wiper arm; and a guide web provided on the guide web and formed to protrude within the range of the outer peripheral surface of the curved portion of the locking spring. and an engaging cam having an outer circumferential surface of the locking spring, the center of curvature of the outer circumferential surface of the locking spring being located between the outer circumferential surface of the locking spring and the axis of the yoke. 2 The distance from the center of curvature to the outer circumferential surface of the outer circumferential surface of the locking spring is longer than the distance from the axis of the yoke to the lower edges of both side walls of the yoke. The distance from the axis to the center of curvature is determined such that the sum of the distances from the axis of the yoke to the center of curvature is greater than the distance from the axis of the yoke to the lower edges of both side walls of the yoke. When the locking spring is rotated to a position where the sum of the distance to the center of curvature of the outer peripheral surface of the locking spring and the distance from the center of curvature to the outer peripheral surface becomes large, the locking spring rotates along the longitudinal axis of the yoke. The windshield wiper according to claim 1, wherein the windshield wiper is detached in a state perpendicular to the direction. 3. The locking spring is provided with two slots extending along each of the guide webs within the outer peripheral surface of the curved portion of the locking spring. Windshield wiper according to item 2.