Electricity: motive power systems – Automatic and/or with time-delay means
Reexamination Certificate
2000-02-24
2001-10-23
Ip, Paul (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
C318S446000, C015S250160, C015S250170
Reexamination Certificate
active
06307341
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wiper driving apparatus for vehicles. In particular, the present invention relates to a wiper driving apparatus for vehicles which can prevent the temporary standstill phenomenon of wiper blades by restraining the overrun phenomenon of the wiper blades during a forward rotation thereof and restraining a driving lever from rotating after an elapse of a specified time in which the driving lever stands still during a reverse rotation of the wiper blades.
2. Description of the Prior Art
FIGS. 1 and 2
show a conventional wiper driving apparatus for vehicles disclosed in Korean Un-examined Publication No. 96-37441. The conventional wiper driving apparatus includes a driving lever
20
which is fixed to and rotates in a body with a driving shaft
10
of a wiper motor, a drive-force transfer arm
40
which is connected to the driving lever
20
and reciprocates in a manner that wipers perform their own function during a forward rotation (A) of the driving lever while the wipers are parked during a reverse rotation (B) of the driving lever, and two driven arms
50
, connected to a free end of the drive-force transfer arm
40
, for driving two wiper arms
60
and two wiper blades
70
.
According to the above apparatus, a ball bearing
30
b
is slidably supported on a hinge shaft of the driving lever
20
within a predetermined angle. During the forward rotation (A) of the driving lever, the ball bearing
30
b
rotates in a direction nearing the rotating shaft of the driving lever
20
as it traces a relatively small circular arc, and thus the wiper blade
70
rotates by a predetermined rotating angle including a start position (S) and a return position (R) so that the wipers perform their own function. During the reverse rotation (B) of the driving lever, the ball bearing
30
b
slidably moves in a direction getting away from the rotating shaft of the driving lever
20
as it traces a relatively large circular arc, and thus the wiper blade
70
moves to a parking position (P) which is deeper than the start position (S).
Also, according to the above apparatus, the driving lever
20
is structured to be folded in one direction. During the forward rotation (A) thereof, the hinge point of the outer end of the driving lever
20
rotates to trace the relatively small circular arc in a state that the driving lever
20
is folded to a predetermined angle, and thus the wiper blade
70
is driven to move in forward and reverse directions. During the reverse rotation (B) of the driving lever
20
, the hinge point of the outer end of the driving lever
20
rotates to trace the relatively large circular arc as the driving lever is unfolded, and thus the wiper blade
70
moves to the parking position (P) which is deeper than the start position (S).
However, the conventional wiper driving apparatus has the drawbacks that during the forward rotation (A) of the driving lever
20
, the overrun phenomenon of the wiper blade
70
happens as the outmost hinge point of the driving lever
20
or the position of the ball bearing
30
b
is changed due to the inertial force of rotation of the wiper. Also, at the time point when the angle of the reverse rotation (B) of the driving lever
20
reaches about 45° as the driving lever
20
rotates reversely from the return position (R) to trace the relatively large circular arc, the driving lever
20
becomes unfolded, or the ball bearing
30
b
, which is slidably supported on the plate type driving lever
20
within the predetermined angle, rapidly slides in the direction getting away from the rotating shaft of the wiper driving motor after its temporary standstill state, so that the wiper blade
70
rotates after the specified waiting time with noises, deteriorating the operational reliability of the wiper.
Specifically, in the parking operation of the wiper blades
70
according to the conventional wiper driving apparatus, the ball bearing
30
b
, which is eccentrically arranged on the hinge shaft of the driving lever
20
, rotates and moves in the upward direction getting away from the driving shaft of the wiper driving motor as it traces the large circular arc during the reverse rotation of the driving lever
20
. At this time, the inertial force of rotation of the wiper affects the drive-force transfer arm
40
, and the position of the ball bearing
30
b
connected to the drive-force transfer arm
40
is changed during its rotation, resulting in that the wiper blade
70
rotates over the predetermined rotating angle, and this causes the overrun phenomenon of the wiper blade
70
, which is the rapid rotation of the wiper blade
70
after the specified waiting time, to happen.
The overrun phenomenon may cause the driver to misrecognize it as malfunction of the wiper driving apparatus. The overrun phenomenon also degrades the visual field of the driver especially in case of rain, resulting in an uncomfortable driving state.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the problems involved in the prior art, and to provide a wiper driving apparatus for vehicles which can prevent a temporary standstill phenomenon of wiper blades, and thus improve the operational reliability of the wipers.
In order to achieve the above object, there is provided a wiper driving apparatus for vehicles having wiper blades which receive a driving force from a driving lever rotated by the rotating force of a wiper motor, and reciprocate between a start position and a return position so that the wiper blades wipe foreign substances such as moisture and dust scattered on a surface of a windshield glass, the apparatus comprising a hinge shaft provided to be projected from a free end of the driving lever, a ball type pin fixed to one side of the driving lever, being eccentric for a predetermined distance with respect to the hinge shaft on the free end of the driving lever so that the ball type pin moves downwardly and rotates in one direction as it traces a relatively small circular arc during a forward rotation of the driving lever while the ball type pin moves upwardly and rotates in the other direction as it traces a relatively large circular arc during a reverse rotation of the driving lever, and a sequential wiper blade rotation type parking means fixed centering around the hinge shaft on the free end of the driving lever so that the ball type pin moves upwardly as it traces a curved line by applying a specified pressure to the ball type pin during a rotation of the ball type pin.
REFERENCES:
patent: 4454626 (1984-06-01), Schmidt et al.
patent: 4597129 (1986-07-01), Eustache et al.
patent: 4798102 (1989-01-01), Buschur et al.
patent: 4924726 (1990-05-01), Rogakos et al.
patent: 5390391 (1995-02-01), Zimmer et al.
patent: 5502866 (1996-04-01), Battlogg
patent: 5894627 (1999-04-01), Irikura
patent: 6000092 (1999-12-01), Irikura
patent: 6145181 (2000-11-01), Murata et al.
Da Sung Co., Ltd.
Ip Paul
Rockey Milnamow & Katz Ltd.
LandOfFree
Wiper driving apparatus for vehicles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wiper driving apparatus for vehicles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wiper driving apparatus for vehicles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2592744