US3590415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive windshield wiper
Assignee: Nissan Motor Co Ltd
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Filing: 1969-12-30
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Granted: 1971-07-06
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Expires: 1989-12-30
Abstract
Abstract An automotive windshield wiper oscillating along a substantially straight horizontal trochoidal curve. The wiper blade sweeps practically the total area of one-half of the windshield. The trochoidal curve is drawn by a crank arm oscillating about a fixed point and a wiper arm mounted pivotally on the periphery of the crank arm, oscillating in a direction opposite to the oscillation of the crank arm. A quadric chain mechanism is formed by the wiper arm and hingedly connected links to hold the wiper blade in a position substantially perpendicular to the horizontal line.
Inventors
- 👤 Yoichi Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:41
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/32; B60S1/34; B60S1/3402; B60S1/3409
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
An automotive windshield wiper assembly comprising a crank arm rotatably supported on a stationary crank arm shaft, a wiper arm rotatably supported on the periphery of said crank arm, the relative length of said wiper arm to the unit length 1 of said crank arm being determined according to the equation R (cosm theta 1-1)/(cos theta 1-1), in which R is said relative length of said wiper arm to said unit length 1 of said crank arm, m is the ratio of the angles formed by said crank arm and said wiper arm when rotated and theta 1 is the angle formed by said rotation of said wiper arm, means to rotate said crank arm, means to rotate said wiper arm in a direction opposite to the direction of said crank arm and interdependently of said crank arm, a wiper blade mounted on the periphery of said wiper arm, a mechanism to maintain said wiper blade in a position substantially perpendicular to a horizontal line, means to incline said wiper blade from said position when reaching the extreme outward limit of the sweep and means to oscillate said windshield wiper assembly, thereby moving said wiper blade along a substantially horizontal path.
Claim 2
Dependent Claim
201 words
An automotive windshield wiper assembly comprising a crank arm rotatably supported on a stationary crank arm shaft, a wiper arm rotatably supported on the periphery of said crank arm, the relative length of said wiper arm to the unit length 1 of said crank arm being determined according to the equation R (cosm theta 1-1)/(cos theta 1-1), in which R is said relative length of said wiper arm to said unit length 1 of said crank arm, m is the ratio of the angles formed by said crank arm and said wiper arm when rotated and theta 1 is the angle formed by said rotation of said wiper arm, means to rotate said crank arm, means to rotate said wiper arm in a direction opposite to the direction of said crank arm and interdependently of said crank arm, a wiper blade mounted on the periphery of said wiper arm, a mechanism to maintain said wiper blade in a position substantially perpendicular to a horizontal line, means to incline said wiper blade from said position when reaching the extreme outward limit of the sweep and means to oscillate said windshield wiper assembly, thereby moving said wiper blade along a substantially horizontal path.
Claim 3
Dependent Claim
143 words
An automotive windshield wiper assembly according to claim 1, in which said mechanism to maintain said wiper blade in a position substantially perpendicular to the horizontal line comprises a quadric chain mechanism formed by said wiper arm, an auxiliary link, a first and a second connecting link, the drive end of said wiper arm having a portion of internal serrations into which an externally serrated portion of a second sleeve shaft fits, a second externally axially grooved stationary pulley, mounted on said stationary crank arm shaft, a fourth externally axially grooved pulley mounted on an independently rotatable wiper arm shaft, said second and fourth pulleys being of similar size, a second internally laterally grooved belt meshed around said second and fourth pulleys, said wiper arm shaft having an externally serrated portion fitting into a portion of internal serrations of said first connecting link.
Claim 4
Dependent Claim
36 words
An automotive windshield wiper assembly according to claim 2, in which said means to incline said wiper blade comprises said quadric chain mechanism in which said second connecting link is shorter than said first connecting link.
Claim 5
Dependent Claim
77 words
An automotive windshield wiper assembly according to claim 1, in which said means to rotate said crank arm comprises a first sleeve shaft integral with said crank arm and inserted rotatably in a boss formed in a casing, said first sleeve shaft being rotatably engaged with said stationary crank shaft mounted fixEdly on said casing, a sector gear secured to said first sleeve shaft by a snap ring and meshing with a fixed pinion of a motor.
Claim 6
Dependent Claim
107 words
An automotive windshield wiper assembly according to claim 1, in which said means to rotate said wiper arm comprises a first externally axially grooved stationary pulley mounted on said stationary crank arm shaft, and of the same size as said second and fourth pulleys, a third externally axially grooved pulley fixedly or integrally secured to an independently rotatable second sleeve shaft and having a smaller diameter than said first pulley, a first internally laterally grooved belt meshed around said first and third pulleys, an externally serrated portion of said second sleeve shaft fitting into a portion of internal serrations of said drive end of said wiper arm.
Claim 7
Dependent Claim
50 words
An automotive windshield wiper assembly according to claim 1, in which said means to oscillate said windshield wiper assembly comprises a first contact button mounted on said sector gear, a second contact button mounted on a first limit switch and a third contact button mounted on a second limit switch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |