JPS6229645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper arm-pivotal fixture assembly method.

It is well known, particularly in the automotive industry, to suitably join two parts made of any given material by gluing them together. One of these parts consists of a cavity into which a shaped piece is inserted which has a complementary shape to the shape formed in the other part. The space existing between the two mated parts, ie between the wall of the cavity and the wall of the corresponding male piece, is filled with a liquid adhesive, such as a polymeric resin. This resin ensures a non-disassembly bond between the two parts after curing. Adhesives of this type are used to join together two parts of molded plastic material. However, especially in this particular case, taking into account the large manufacturing tolerances that exist in the dimensions of the parts that are to be joined together, and also the width of the gap obtained between these two parts, it is necessary to The problem arises of the relative positioning of the two parts.

The object of the invention is to ensure a temporary retention between the two parts to be joined together during the curing of the adhesive introduced into the space existing between the cavity and the male piece fitted therein. The object of the present invention is to provide an improvement to such a joint, which consists in forming at least one thin fin in relief on at least three walls of the two parts. The fins have a low mechanical resistance, so that they can be deformed by pushing the male-shaped piece into the cavity. A mechanical connection between the two assembled parts can be ensured by the adhesive alone after it has hardened.

The present invention also provides a wiper arm 16 of a windshield wiper device.
The ends 3, 7 of the wiper blade are arranged in a cavity 4, 22 which is closed at one end by a pivoting fitting 17 for pivotally mounting a wiper blade, the walls of said cavity and the walls of said wiper arm a wiper arm for assembling the wiper arm of the windshield wiper device and the pivoting fixture by placing an amount of adhesive, such as a polymeric resin, into the cavity 4, 22 capable of filling the space between the wiper arm and the pivoting fixture; In the arm-pivoting fixture assembly method, at least three of the two components consisting of the wiper arm 16 and the pivot fixture 17 are assembled in order to accurately position the wiper arm 16 within the cavity. The wall is provided with a protrusion, the protrusion being constituted by at least one fin 5, 9, 25 provided on each wall, the inner surface of the cavity 4, 22 and the wiper arm 16
The shape of the void is adapted to the shape of the end of the wiper arm so that the outer surface of the end of the wiper arm is parallel to the outer surface of the wiper arm, and a space having a substantially constant thickness is defined between the inner and outer surfaces of the wiper arm. The ends of the wiper arms are complementarily maintained in position by the plurality of fins 5, 9, 25 during the curing of the adhesive.

A method of assembling a wiper arm-pivotal fixture, characterized in that:

In the preferred embodiment (FIGS. 1 and 2), one locating fin is formed in each wall of the cavity that receives the male piece. By pushing the male-shaped piece into a cavity having a complementary shape, the positioning fins formed in the cavity are deformed. The positioning fins extend continuously parallel to the axis of the cavity and over substantially the entire depth of the cavity. The male piece introduced into the cavity may have small striations or scratches.
providing scorings, slits or partial protrusions. The space may be approximately in the shape of a parallelepiped (a hexahedron in which all six faces are parallelograms), but in Figures 1 and 2, it is a rectangular parallelepiped (a hexahedron in which all six faces are rectangles). , and one positioning fin is provided in relief on each of the four sides of the space. Each positioning fin is disposed substantially in the center plane of the sides of the cavity. In another embodiment (shown clearly in FIGS. 3 and 7) in which the cavity has the shape of a rectangular parallelepiped, locating fins are provided that extend substantially in the midplane of each of the two smaller sides. Two mutually parallel positioning fins are provided on one of the two larger side surfaces at a certain distance from each other. The adhesive used is a resin that can be polymerized at ambient temperature, such as an elastomeric silicone. The two parts to be joined together are made from molded plastic material.

Embodiments of the assembly method of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show two parts 1, 2 to be assembled by the assembly method of the invention. The part 2 made of metal comprises a male-shaped piece 3 with a rectangular cross section adapted to fit into a complementary shaped cavity 4 formed in the part 1.

As can be seen in FIG. 2, the cavity 4 provided in the component 1 is provided with positioning fins 5. Each of the four fins 5 is arranged on each of the four sides of the space 4. Each fin 5 is arranged substantially in the longitudinal center plane of each of these side surfaces. Each fin 5 extends over substantially the entire depth of the cavity 4. Each fin 5
are dimensioned such that the male piece 3 of the part 2 is held securely in the cavity 4 of the part 1 by the deformation of the positioning fins 5.

The male-shaped piece 3 is press-fitted into the cavity 4 so as to ensure a completely irredeemable bonding of the two parts 1, 2. A liquid adhesive is introduced into the cavity 4, such as an elastomeric silicone sold under the trade name silmate, which can be vulcanized at ambient temperature. 4 positioning fins 5
This temporarily fixes the shaped piece 3 in the cavity 4 and keeps the side wall of the cavity 4 apart from the shaped piece 3. The positioning fins 5 only have a momentary fixing effect. The reason is that the male-shaped piece 3 is
It is this adhesive, when cured, that holds the two parts 1, 2 in place and provides a reliable mechanical bond between them. Small striations, scratches, etc. to enhance the adhesion of the adhesive around the male piece 3 of the part 2.
Scorings, slots, partial protrusions or similar features may be provided around the shaped piece 3.

In the variant shown in FIG. 3, a male piece 7 with a rectangular cross section is fitted into a complementary shaped cavity formed in a further part 8. Two positioning fins 9 are formed on only one long side of this space. Each one of the short sides of the cavity is provided with a positioning fin located in the longitudinal midplane of the short sides. The two fins 9, 9 formed on one of the long sides of the cavity are parallel to each other and are arranged approximately symmetrically on each side of the longitudinal center plane of the long side. When the male piece 7 is pushed into the cavity of the part 8 into which the liquid adhesive has been introduced, the male piece 7 forms no fins with the four fins 9 as shown in FIG. It is held momentarily by the long sides of the cavity of part 8. Liquid adhesive is Fin9
occupies the space existing between the three side surfaces formed in relief and the three oppositely located side surfaces of the male-shaped piece 7, and after curing of this introduced adhesive 2
It is possible to sufficiently mechanically connect the parts.

4, 5, 6 and 7 illustrate the assembly method of the present invention for securing a pivoting fixture to the end of a wiper arm for a motor vehicle. This windshield wiper is 2
The wiper blade 11 is provided with a support band-like piece 10 that supports the wiper blade 11 by means of two pivoting swing arms 12, 12. 2
The pivot arms 12, 12 are interconnected by a main strip 13 with a groove-shaped cross section. In the central area of the main strip 13 a pivot area is arranged. In this pivot area, a core with a U-shaped groove cross section is removed and two side flanges 1 of this groove shape are removed.
4 and 14 are enlarged. The two flanges 14, 14 separating the pivot area on each side are hinge pins 15.
They are interconnected by. Support strip piece 10
The wiper arm 16 is driven on the windshield of an automobile by means of a wiper arm 16 made of a metal rod with a rectangular cross section. The connection between the wiper arm 16 and the support strip 10 is provided by a pivot fitting 1 made of molded plastic material.
Perform according to 7.

The pivot fitting 17 has a slot 1 at one of its ends between two lips 19, 20 that are substantially parallel to each other.
8 is formed. The bottom of the slot 18 is rounded. The radius of curvature of this bottom is hinge pin 1
equal to the radius of 5. On the side opposite to the side through which the slot 18 opens, the pivot fitting 17 is provided with a support surface portion 21 . The surface of the supporting surface portion 21 is formed to be a part of a cylindrical surface centered on the axis of the hinge pin 15. The lower part of the support surface part 21 is connected to the extension of the lip 20 and the upper part of the support surface part 21 is connected to a part of the pivot mount 17 having a cavity 22 of rectangular cross section. The elastic tongue 23 is arranged in the lower central area of the support surface part 21. The elastic tongue-shaped piece 23 projects toward the outside of the support surface portion 21. The radius of the supporting surface portion 21 having a partially cylindrical surface is such that the supporting surface portion 21 has a protrusion 2.
Hinge pin 1 so that it abuts against and is supported by 4.
5 and the ledge 24.

The cavity 22 located in the pivot fixture 17 is formed with positioning fins 25 on three sides, as can be seen in FIG. Two positioning fins 25 parallel to each other are formed on the long side surface of the space located on the side of the supporting surface portion 21 (lower side in FIGS. 6 and 7). Each of the four fins 25 is continuous and extends over substantially the entire length of the space 22 in parallel to the axis of the space 22. Pivoting fitting 17
can be made by plastic molding with large manufacturing tolerances regarding the dimensions of the cavity 22. A small score 26 is formed in the end area of the wiper arm 16 which is adapted to fit into the cavity 22 of the pivoting fixture 17.

The pivot fitting 17 is joined to the wiper arm 16 by force-fitting the wiper arm 16 into a cavity 22 into which a liquid adhesive has been introduced. This pressure fit is achieved by deforming each positioning fin 25. The positioning fins 25 allow the liquid adhesive to harden at atmospheric temperature.
The end of the wiper arm 16 can be securely fixed within the space 22. Adhesion of the adhesive at the end of the wiper arm 16 is enhanced by the presence of small streaks 26. In addition, although a shrinkage cavity is formed due to shrinkage due to polymerization of the liquid adhesive, the side wall of the cavity 22 is flexible.
The mechanical strength of this connection is improved.

After the pivot fitting 17 and the wiper arm 16 are glued together, the pivot fitting 17 is attached to the two side flanges 1
4 and 14 from above, insert the hinge pin 15 into the slot 18 of the pivot fitting, and insert the pivot fitting 17 until the hinge pin 15 abuts the rounded bottom of the slot 18. Push down. The support strip 10 is then rotated relative to the wiper arm 16. At this time, the protrusion 24 provided on the support strip 10 comes into contact with the elastic tongue 23, but the elastic tongue 23 is pushed down by the protrusion 24 due to its elasticity. The ledge 24 is an elastic tongue 23
, so that the elastic tongue 23 abuts against the rear of the ledge 24. After the pivot fitting 17 is thus positioned within the support strap 10 as shown in FIGS. forming a stop piece that limits upward rotational movement of the pivot fitting 17.

Although the present invention has been described in detail with reference to its embodiments, it is obvious that the present invention can be modified in various ways without departing from its spirit.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of two parts assembled by the assembly method of the present invention, and FIG.
3 is a cross-sectional view of a variant of FIG. 2; FIG. 4 is a side view of the wiper support strip pivotally attached to the wiper arm by means of a pivoting mount according to the assembly method of the present invention, and FIG. 5 is an enlarged longitudinal section taken along the center line of the support strip of FIG. 4. It is a front view. 6 is a longitudinal cross-sectional view showing the pivoting fixture of FIG. 5 prior to its fixation to the wiper arm, and FIG. 7 is a cross-sectional view taken along the line -- in FIG. 6. 3, 7... End, 4, 22... Housing, 5, 2
5... Fin, 16... Wiper arm, 17... Pivoting fixture.

Claims (1)

[Claims] 1. End portion 3 of wiper arm 16 of windshield wiper device;
7 is placed in a cavity 4, 22 which is closed by one end of a pivoting fixture 17 for pivotally mounting a wiper blade, and the space between the wall of the cavity and the wall of the wiper arm is Assembling the wiper arm of the windshield wiper device and the pivoting attachment by placing an amount of adhesive, such as a polymeric resin, into the cavity 4, 22 capable of filling the wiper arm - pivoting attachment. In the method of assembly, at least three walls of the two components consisting of the wiper arm 16 and the pivot mount 17 are provided with projections in order to accurately position the wiper arm 16 within the cavity. and the protrusion is constituted by at least one fin 5, 9, 25 provided on each wall, the inner surface of the cavity 4, 22 and the wiper arm 16
The shape of the void is adapted to the shape of the end of the wiper arm so that the outer surface of the end of the wiper arm is parallel to the outer surface of the wiper arm, and a space having a substantially constant thickness is defined between the inner and outer surfaces of the wiper arm. Wiper arm pivoting, complementary, characterized in that during curing of the adhesive, the end of the wiper arm is maintained in position by the plurality of fins 5, 9, 25. How to assemble the fixture. 2. At least one fin is formed in at least three walls of the cavity receiving the end of the wiper arm 16.
How to assemble the wiper arm - pivot mount described in section. 3. The end of the wiper arm is pressure-fitted into the cavity having a shape complementary to the shape of the end by deformation of the plurality of positioning fins formed in the cavity. A method for assembling a wiper arm-pivotal fixture according to claim 1 or 2. 4. The wiper arm-pivoting fixture assembly method according to claim 2, wherein a plurality of said fins are continuously extended in parallel along substantially the entire depth of said cavity. 5. A claim characterized in that a small streak-like flaw, a scratch (scratching flaw), a groove, or a partial protrusion is formed on the end portion of the wiper arm that is inserted into the void. Wiper arm--pivoting fixture assembly method as described in Scope 2. 6. The cavity is formed into a substantially parallelepiped shape, and the fins for positioning are formed in relief on each one of the side surfaces of the cavity, and each one of these fins is formed by:
3. The wiper arm-pivoting fixture assembling method as claimed in claim 2, wherein the wiper arm-pivot mount is disposed approximately in the central plane of one of the sides of the cavity. 7 Make the space into a parallelepiped shape, and 2 of this space
Each of the two short side surfaces is provided with the positioning fin located approximately at the center of the side surface, and one of the two long sides is provided with the positioning fin parallel to each other and spaced apart from each other by a certain distance. A method for assembling a wiper arm-pivotal fixture according to claim 2.