JPH0450206Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper device for a vehicle. In particular, the present invention relates to an improvement in the rotatable connecting portion between the first stay and the second stay.

[Conventional technology]

Hereinafter, a conventional wiper device for a vehicle will be explained with reference to FIGS. 5 and 6.

In the figure, 1 is a metal first stay, this first stay 1 has a cross-section shape, and mounting pieces 10 are formed on both left and right vertical pieces at the tip of this first stay 1,
A small circular hole 11 is opened in the pair of mounting pieces 10. Reference numeral 2 denotes a second stay made of metal, and the second stay 2 has a cross-sectional shape that is one size smaller than the first stay, and has mounting pieces 20 on both left and right vertical pieces in the center.
A small circular hole 21 is formed in the mounting piece 20. 3 is a spacer, and the spacer 3 has a cross-sectional shape that is one size smaller than the first spacer and one size larger than the second stay 2;
Small circular holes 31 are opened in both the left and right vertical pieces,
Moreover, a boss portion 30 is formed on the inner edge of the small through hole 31. 4 is a metal rivet, and this rivet 4 consists of a head 40 and a leg 41.

Thus, the spacer 3 is externally fitted onto the second stay 2, the boss portion 30 of the spacer 3 is fitted into the small through hole 21 of the second stay 2, and the first stay 1 is externally fitted onto the second stay 2 and spacer 3. fit. next,
The leg portion 41 of the rivet 4 is inserted into the small through holes 11, 31, 21 of the first stay 1, spacer 3, and second stay 2.
is inserted, and the tips of the leg portions 41 of the rivet 4 are caulked to rotatably attach the second stay 2 to the first stay 1, and to connect the rotating portion of the first stay 1 to the second stay 2.
A spacer 3 is interposed between the stay 2 and the rotating portion.

[Problem that the invention attempts to solve]

However, the conventional vehicle wiper device described above is
Since the first stay 1, second stay 2, and spacer 3 are integrally assembled by crimping the metal rivet 4, rust occurs in the crimped portion of the rivet 4. Further, due to variations in the tightening of the rivets 4, play occurs between the first stay 1, the second stay 2, and the spacer 3, and a metallic sound (squeaking sound) is generated during wiping. Furthermore, there are problems such as a large number of man-hours for tightening the rivets 4.

Therefore, an application for a wiper device for a vehicle (Utility Model Application No. 185662/1983) was filed earlier, which solved the above-mentioned problems.

This wiper device for a vehicle includes a first lever 1, a second lever 2, and a second lever 2 connected to the first lever 1.
A pin 7 is rotatably attached to the pin 7, and a resin spacer 8 is interposed between the rotating portion of the first lever 1 and the rotating portion of the second lever 2. A stopper 8f is provided on the spacer 8 in a direction perpendicular to the axial direction of the pin 7, and the stopper 8f of the spacer 8 is elastically engaged with the small diameter portion 7a of the pin 7 in the radial direction of the pin 7. This also prevents the pin 7 from moving in the axial direction.

However, in the above-described vehicle wiper device, the stopper 8f of the spacer 8 is provided in a direction perpendicular to the axial direction of the pin 7, and the stopper 8f of the spacer 8 is attached to the small diameter portion 7a of the pin 7 so as to be elastic in the radial direction of the pin 7. Therefore, when the wiper blade swings left and right during wiper operation, only a portion of the stopper 8f hits the stepped portion of the pin 7, and the stopper 8f receives the force in the direction of bending left and right. other,
A force in the swinging direction is applied, and a large load is applied to the support portion of the stopper 8f, which is the root of the spacer 8.

In such a state, in a wiper device that operates under harsh conditions that change from high temperature to low temperature (or vice versa, from low temperature to high temperature), fatigue of the resin accumulates in the support part of the stopper 8f, causing the support part to deteriorate. There is a possibility of damage, and there are problems with durability, which is not desirable for wiper devices.

An object of the present invention is to improve the above-mentioned wiper device for a vehicle, and to provide a wiper device for a vehicle that has excellent durability.

[Means for solving problems]

The present invention is characterized in that the rivet is provided with an engaging stepped portion, and the spacer is provided with two engaging pawls that elastically engage with the engaging stepped portion of the rivet in the axial direction of the rivet.

[Effect]

In the present invention, due to the above-described structure, when the wiper blade swings left and right during wiper operation, the tips of the two engaging claws of the spacer engage with the engaging stepped portion of the rivet in a press-contact state. , No force in the twisting direction is applied to the two engaging claws, and only force in the direction of expansion and contraction is applied.

Further, since the two engaging claws prevent the rivet from coming off in the axial direction of the rivet, the load on the support portion, which is the base of the engaging claw with the spacer, is divided into two and reduced.

Therefore, compared to a conventional vehicle wiper device in which one stopper 8f is elastically engaged with the small diameter portion 7a of the pin 7 in the radial direction of the pin 7, the load applied to the support portion of the two engaging claws is reduced. is extremely small, resin fatigue of the supporting portion is reduced, the possibility of damage to the wiper is reduced, and durability is improved.

〔Example〕

Hereinafter, two examples of the vehicle wiper device according to the present invention will be described with reference to FIGS. 1 to 4.

Figure 1 shows the first wiper device for a vehicle according to the present invention.
FIGS. 2 and 3 are a partial sectional view showing an embodiment of the present invention, and FIGS.

In the figure, reference numeral 5 denotes a first stay made of metal, and this first stay 5 has a square cross section. Attachment pieces 50 are formed on both left and right vertical lower pieces of the tip of this first stay 5. A circular hole 51 is opened in the hole.

6 is a metal second stay;
has a cross-sectional shape that is one size smaller than the first stay 5, and a mounting piece 60 is formed on both left and right vertical pieces in the middle of the second stay 6, and a circular through hole 61 is formed in the mounting piece 60. . Further, a rectangular through hole 62 is opened in the middle horizontal piece of the second stay 6.

Reference numeral 7 designates a spacer made of resin, and this spacer 7 has a cross section that is one size smaller than the first stay 5 and one size larger than the second stay 6, and has mounting pieces 70 formed on both left and right vertical pieces. Then, a circular through hole 71 is opened in the mounting piece 70. Spacer 7
An insertion part 73 is integrally provided on the front and back of the inner surface of the horizontal piece 72 to protrude downward, and an arm part 74 is integrally provided on the opposite surface of the insertion part 73 to protrude in the opposite direction. The engaging claws 75 are integrally provided so as to project slightly inward in the same direction. In addition, 76 is the engagement claw 7
5 is a through hole for die cutting. Reference numeral 77 denotes a locking portion integrally provided at the front end of the spacer 7.

Reference numeral 8 designates a rivet made of resin, and this rivet 8 includes a shaft portion 80, a head portion 81 integrally provided at one end of the shaft portion 80, and a small diameter shaft portion 8 provided at an intermediate portion of the shaft portion 80.
2, and a stepped portion 83 formed at the boundary between the small diameter shaft portion 82 and the shaft portion 80.

In this way, the spacer 7 is fitted onto the second stay 6, and the insertion portion 73, arm portion 74,
The engaging claw 75 is inserted into the through hole 62 of the second stay 6. Next, the first
While the stay 5 is fitted onto the outside, the tip of the first stay 5 is locked to the locking part 77 of the spacer 7. Next, rivets 8 are inserted into the circular through holes 51, 71, 61 of the first stay 5, spacer 7, and second stay 6.
Press the rivet 8 from its tip (the end opposite to the head 81) in the direction of the arrow in FIG. Then, the locking claw 75 of the spacer 7 is bent outward due to contact with the shaft 80 of the rivet 8, and when the shaft 80 of the rivet 8 is fitted into the circular through-holes 51, 71, 61,
The engaging claw 75 engages with the stepped portion 83 of the rivet 8, and as a result, the rivet 8 can be prevented from coming off in the direction opposite to the arrow. On the other hand, the head 81 of the rivet 8 comes into contact with the peripheral edge of the circular hole 51 of the first stay 5, and as a result, the rivet 8 can be prevented from coming out in the direction of the arrow.

At this time, when the wiper blade swings left and right during wiper operation, the tips of the two engaging claws 75 of the spacer 7 engage in pressure contact with the step part 83 of the rivet 8, and the two engage with the stepped part 83 of the rivet 8. No force in the twisting direction is applied to the engaging claw 75, and only force in the direction of expansion and contraction is applied.

Further, since the two engaging claws 75 prevent the rivet 8 from coming off in the axial direction of the rivet 8,
The load applied to the support portion, which is the base of the engagement claw 75 with the spacer 7, is divided into two and reduced.

Therefore, compared to a conventional vehicle wiper device in which one stopper 8f is elastically engaged with the small diameter portion 7a of the pin 7 in the radial direction of the pin 7, the amount of force applied to the support portion of the two engaging claws 75 is reduced. The load becomes extremely small, the resin fatigue of the support part is reduced, the possibility of the wiper being damaged is reduced, and the durability is improved.

In this way, since the resin rivet 8 is used instead of the metal rivet and the second stay 6 is rotatably attached to the first stay 5 with the resin spacer 7 interposed, the conventional vehicle wiper device There is no rust on the caulking parts of metal rivets such as. Therefore, the rust prevention effect is improved. Also, the first stay 5
and the second stay 6 with a resin spacer 7.
This can prevent the generation of metallic sounds. Furthermore, since the resin rivet 8 is attached to the first stay 5, second stay 6, and resin spacer 7, and the first stay 5, second stay 6, and resin spacer 7 are assembled, there is a step of tightening the metal rivet. is not necessary.

Figure 4 shows the second wiper device for a vehicle according to the present invention.
FIG.

In the figure, the same reference numerals as in FIGS. 1 to 3 indicate the same parts. In this embodiment of the vehicle wiper device of the present invention, the engaging claws 75 are provided alternately. On the other hand, the resin rivet 9 has a shaft portion 90 and inclined surfaces 91 provided alternately at the corners of both ends of the shaft portion 90.
and a small diameter shaft portion 92 provided at the intermediate portion of the shaft portion 90;
It consists of a stepped portion 93 formed at the boundary between the small diameter shaft portion 92 and the shaft portion 90.

Thus, the resin spacer 7 is fitted onto the second stay 6, the first stay 5 is fitted onto it, and the first
The rivet 9 is press-fitted into the circular through holes 51, 71, and 61 of the stay 5, spacer 7, and second stay 6 in the direction of arrow A (or in the direction of arrow B). Then, the right (left) engaging claw 75 bends along the slope, and the left (right) engaging claw 75 also bends outward due to contact with the shaft 90, causing the shaft 90 of the rivet 9 to become circular. When the rivet 9 is inserted into the through holes 51, 71, and 61, the engaging claw 75 engages with the stepped portion 93 of the rivet 9, thereby preventing the rivet 9 from coming out in the A direction and the B direction.

This embodiment provides the same effects as those of the first embodiment described above.

[Effect of idea]

As is clear from the above, in the vehicle wiper device of the present invention, the two engaging claws of the spacer are elastically engaged with the engaging stepped portion of the rivet in the axial direction of the rivet. When the wiper blade swings from side to side, the tips of the two engaging claws of the spacer engage in pressure contact with the engaging step part of the rivet, and the two engaging claws have a torsional direction. No force is applied, only force in the direction of expansion and contraction is applied.

Further, since the two engaging claws prevent the rivet from coming off in the axial direction of the rivet, the load on the support portion, which is the base of the engaging claw with the spacer, is divided into two and reduced.

Therefore, compared to a conventional vehicle wiper device in which one stopper is elastically engaged with the small diameter portion of the pin in the radial direction of the pin, the load applied to the support portion of the two engaging claws is extremely small. , resin fatigue in the support part is reduced, reducing the possibility of wiper damage.
Durability is improved.

[Brief explanation of drawings]

Figure 1 shows the first wiper device for a vehicle according to the present invention.
FIGS. 2 and 3 are partial sectional views showing an embodiment of the present invention. FIGS. FIG. 4 is a partially sectional view showing a second embodiment of the wiper device for a vehicle according to the present invention. Fifth
This figure is a partial perspective view showing a conventional wiper device for a vehicle, and FIG. 6 is a sectional view taken along the line -- in FIG. 5. 5...First stay, 50...Mounting piece, 51...
Through hole, 6...Second stay, 60...Mounting piece, 61
...Through hole, 7...Spacer, 70...Mounting piece, 7
1... Through hole, 75... Engaging claw, 8, 9... Rivet, 80, 90... Shaft portion, 81... Head, 83,
93...Danbe.

Claims (1)

[Scope of utility model registration request] A first stay, a second stay, a resin rivet that rotatably attaches the second stay to the first stay, and a space between the rotating portion of the first stay and the rotating portion of the second stay. In the wiper device for a vehicle, the rivet has an engaging stepped portion, and the spacer elastically engages with the engaging stepped portion of the rivet in the axial direction of the rivet. A wiper device for a vehicle characterized by having two engaging claws.