JPH0116681Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper device for cleaning the window glass of a vehicle.

[Prior Art] In the wiper device described above, the wiper blade made of rubber is constantly pressed against the window glass, so when the window glass is heated under the scorching sun, the wiper blade deteriorates.

Utility Model Publication No. 52-60045 states that when used (in rainy weather)
Other than that, a wiper arm is separated from the window glass by a spring, and the wiper arm is pressed against the window glass by electromagnetic force only when in use. However, this is undesirable because the wiper arm is pulled away from the window glass by the spring when the wiper is not in use on sunny days, so the wiper arm flaps and generates noise while the vehicle is running.

[Problems to be Solved by the Invention] An object of the invention is to provide a wiper device in which the wiper blade is automatically separated from the window glass only when the vehicle is stopped under the scorching sun.

[Means for Solving the Problem] In order to achieve the above object, the configuration of the present invention uses an engagement piece to project a support piece to the side of a mounting plate that can be attached to a support piece of a wiper blade, and Accordingly, a rod-shaped heat deformable member made of a shape memory alloy is attached to the side surface of the support plate so that the end thereof curves downward when the temperature is high and comes into contact with the window glass.

[Function] When the vehicle is stopped in the hot sun and the glass becomes hot, the end of the thermally deformable member 23 curves and comes into contact with the window glass 10, and the wiper arm 6 is pushed up.
Since the wiper blade 12 is pulled away from the window glass 10, its thermal deterioration is prevented.

[Embodiment of the invention] The basic structure of the wiper device is as shown in FIG. A wiper arm 6 is tiltably supported at the tip of the wiper arm 6 by a pin 5 extending in a direction intersecting the drive shaft 3. An auxiliary arm 7 is supported at the tip of the wiper arm 6, and a holder 9 is attached to the tip by a pin 8. The wiper blade 1 is supported by the holder 9 by known means.
2 is supported and housed inside the wiper arm 6, and the wiper arm 6 is rotated about the shaft 5 by a toggle mechanism including a spring that has one end latched to the shaft 5 and the other end latched to the proximal end of the auxiliary arm 7. The wiper blade 12 is urged to rotate counterclockwise and is pressed against the window glass 10. Such a toggle mechanism is similar to the conventional one, and since it is not directly related to the gist of the present invention, it will not be further described.

As shown in FIGS. 2 and 3, the wiper blade 12 has a substantially cross-shaped cross section and is attached to a slit 27 of a band-shaped metal support plate 16 supported by the holder 9. As shown in FIGS. The wiper blade 12 has a flat plate portion 15 superimposed on the lower side of the support plate 16.
, a wiping piece 14 for wiping the window glass 10 , and a support plate 1
It is integrally constructed with a retaining piece 13 having a triangular cross section and projecting upward from the slit 27 of No. 6. The retaining piece 13 is pressed against the upper surface of the support plate 16 by a presser piece 17 (FIG. 2) provided in the middle of the slit 27 of the support plate 16. However, the present invention is not limited to this example as long as the wiper blade 12 is attached to the support plate 16.

As shown in FIGS. 3 and 4, the wiper device of the present invention includes a support plate 16 that supports the wiper blade 12.
Thermal deformation members 23 are attached to both side edges of the housing along these edges by mounting plates 21. The thermally deformable member 23 is made of a straight rod-shaped shape memory alloy at room temperature.
Elastic leg pieces 24 made of rubber or the like are connected to both ends to abut against the window glass 10.

The mounting plate 21 is made of a plate material with a chevron-shaped cross section that covers the support plate 16 and the retaining piece 13 so as to be attached to the support plate 16 and the wiper blade 12, and has a cylindrical shape that supports the thermally deformable member 23 by wrapping both side edges of the plate material. The supporting pieces 22 of the wiper blade 12 are integrally constructed, and hook-shaped engaging pieces 28 that engage with the lower side of the plate portion 15 of the wiper blade 12 from both side edges are integrally constructed.

The heat deformable member 23 is heated to a predetermined temperature (for example, 40°C)
As shown in FIGS. 2 and 3, both ends 23a
is preformed with a shape memory alloy so that it can be bent at right angles, and its length is such that when both ends 23a are bent, the lower end of the wiping piece 14 of the wiper blade 12 is separated from the window glass surface 10 by the ends 23a. is set to

The crystal structure of the shape memory alloy changes in the solid state due to temperature changes, and changes to a matrix structure at a higher temperature than the transformation point, and a martensitic structure at a lower temperature. Then, when the matrix structure, which has been memory-molded in advance, changes to a martensitic structure, superelasticity occurs. On the other hand, when heated from the low temperature side, it has the property of changing to the matrix structure and returning to the pre-memory-molded shape. Such shape memory alloys themselves are known. The transformation point at which the matrix structure is formed varies depending on the alloy composition, and any temperature can be obtained.

In the above configuration, when the vehicle is parked under the hot sun for a long time, the wiper blade 12 comes into contact with the window glass 1.
0 is heated, both ends 23a of the thermally deformable member 23, which were straight at room temperature, are bent at right angles and come into contact with the window glass 10, as shown in FIG. Piece 14 is lifted from window pane 10 as shown in FIG. Therefore, deterioration of the wiper blade 12 due to heat is prevented. Conversely, when the ambient temperature around the window glass 10 decreases, the thermally deformable member 23 straightens as shown in FIG. 4, and the wiper blade 12 is pressed against the window glass 10 again by a spring (not shown).

[Effects of the invention] As described above, the present invention uses an engagement piece to project a support piece to the side of a mounting plate that can be attached to a support plate of a wiper blade. Since the deformable member is attached to the side surface of the support plate so that the end curves downward and comes into contact with the window glass when the temperature is high, the wiper blade is automatically pulled up from the window glass together with the support plate, so that the wiper blade is automatically pulled up from the window glass. The deterioration of the wiper blade due to
Wiper blade service life is extended. Furthermore, the mounting plate allows the thermally deformable member to be easily attached to the wiper support plate even after the wiper is attached, which has the effect of meeting regional or seasonal demands.

[Brief explanation of the drawing]

FIG. 1 is a side view of the wiper device according to the present invention, FIG. 2 is a perspective view of the main part, FIG. 3 is a front sectional view of the wiper device, and FIG. 4 is a side view of the wiper device. 3: Drive shaft, 6: Wiper arm, 7: Auxiliary arm, 9: Holder, 12: Wiper blade, 14:
wiping piece, 15: plate section, 16: support plate, 21: mounting plate, 23: heat deformable member, 24: elastic leg piece.

Claims (1)

[Scope of utility model registration request] The engagement piece causes the support piece to protrude to the side of a mounting plate that can be attached to the wiper blade support plate, and the support piece allows the rod-shaped shape memory alloy heat deformable member to be attached to the wiper blade support plate.
A wiper device that is attached to the side surface of the support plate so that the end curves downward and comes into contact with the window glass when the temperature is high.