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US 5,225,752 AGranted
Wiper system
AssigneeNissan Motor Co., Ltd.
InventorsToru Yasuda, Hideaki Nemoto, Yasuyuki Yamaguchi, Masayuki Kaneda
Life of this patent
Estimating the term…
Abstract
A wiper system for wiping a windshield of an automotive vehicle. The wiper system is comprised of a wiper arm to which a wiper blade is movably fixed. The wiper arm is driven by a wiper motor through a link mechanism so as to move the wiper blade in such a manner that the moving speed of the wiper blade is accelerated at an initial period and decelerated at the remaining period in a stroke of wiper blade movement. The degree of deceleration is reduced in the course of the remaining period, thereby omitting troublesome or bothersome feeing of a driver seated in the vehicle.
Claims23
A wiper system comprising:
- a wiper arm;
- a wiper blade movably fixed to said wiper arm, said wiper blade being movable with said wiper arm to wipe a surface of a window panel;
- means for setting moving characteristics during a stroke of said wiper blade, said characteristics including an acceleration section in which a moving speed of said wiper blade is increased from zero to a maximum speed, and a deceleration section in which the moving speed of said wiper blade is decreased from the maximum speed to zero,
- wherein a graphical representation of the moving characteristics in terms of moving speed of the wiper blade versus time includes a convex portion during the acceleration section and a concave portion followed by a convex portion during the deceleration section;
- and
- means for driving said wiper arm to move said wiper blade in accordance with said wiper blade moving characteristics.
3 more elements
A wiper system comprising:
- a wiper arm;
- a wiper blade movably fixed to said wiper arm, said wiper blade being movable with said wiper arm to wipe a surface of a window panel;
- means for setting moving characteristics during a stroke of said wiper blade, said stroke being one of a going stroke and a returning stroke, said characteristics including an acceleration section in which a moving speed of said wiper blade is increased from zero to a maximum speed, and a deceleration section in which the moving speed of said wiper blade is decreased from the maximum speed to zero,
- said deceleration section being after said acceleration section in time of movement of said wiper blade and having a first deceleration increasing part, a second deceleration increasing part, and a deceleration reducing part at which the deceleration in the moving speed of the wiper blade is reduced relative to that at said first and second deceleration increasing parts of said deceleration section, said deceleration reducing part being between said first and second deceleration increasing parts in time of movement of said wiper blade;
- wherein a graphical representation of the deceleration section of the stroke in terms of moving speed of the wiper blade as a function of a rotational angle of a wiper arm drive shaft includes a concave portion during the deceleration reducing part and a convex portion during each of the first and second deceleration increasing parts;
- and
- means for driving said wiper arm to move said wiper blade in accordance with said wiper blade moving characteristics.
4 more elements
A wiper system comprising:
- a wiper arm;
- a wiper blade movably fixed to said wiper arm, said wiper blade being movable with said wiper arm to wipe a surface of a window panel;
- means for setting moving characteristics during a stroke of said wiper blade, said characteristics including an acceleration section in which the moving speed of said wiper blade is rapidly increased from zero to a maximum speed, and a deceleration section in which the moving speed of said wiper blade is decreased from the maximum speed to zero,
- said deceleration section being after said acceleration section in time of movement of said wiper blade and having a first deceleration increasing part during which the moving speed of said wiper blade is rapidly decreased, a second deceleration increasing part during which the moving speed of said wiper blade is rapidly decreased, and a deceleration reducing part at which the deceleration in the moving speed of the wiper blade is reduced relative to each deceleration increasing part,
- said deceleration reducing part being between said first and second deceleration increasing parts in time of movement of said wiper blade;
- and
- means for driving said wiper arm to move said wiper blade in accordance with said wiper blade moving characteristics.
4 more elements
A wiper system comprising:
- a wiper arm;
- a wiper blade movably fixed to said wiper arm, said wiper blade being movable with said wiper arm to wipe a surface of a window panel;
- means for setting moving characteristics during a stroke of said wiper blade, said characteristics including an acceleration section in which the moving speed of said wiper blade is accelerated toward a maximum speed, and a deceleration section in which the moving speed of said wiper blade is decelerated from the maximum speed, said deceleration section being after said acceleration section in time of movement of said wiper blade and having a deceleration reducing part at which the deceleration in the moving speed of the wiper blade is reduced relative to that at another part of said deceleration section which part is before said deceleration reducing part in time of movement of said wiper blade;
- said moving characteristics setting means including means for setting wiping areas of said wiper blade during a stroke of said wiper blade, said wiping areas being formed on the surface of said window panel and wiped with said wiper blade,
- said wiping areas including a first wiping area at which a wiping action of said wiper blade is initiated, a second wiping area located after said first wiping area in time of movement of said wiper blade, and a third wiping area located after said second wiping area in time of movement of said wiper blade, the wiping action of said wiper blade being terminated at said third wiping area,
- said second wiping area having an area smaller than that of said first wiping area and larger than said third wiping area, an average moving speed of said wiper blade at said third wiping area being lower than that at said first wiping area and higher than that at said second wiping area;
- and
- means for driving said wiper arm to move said wiper blade in accordance with said wiper blade moving characteristics.
5 more elements
Dependencies are inferred from the claim text.