Patent US3845700A successfully refreshed from Google Patents.
US3845700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation shutter control of motor vehicle
Assignee: Peugeot & Renault
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Filing: 1972-07-05
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Granted: 1974-11-05
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Expires: 1992-07-05
Abstract
Abstract This invention relates to an automatic device for controlling the shutter associated with the fan of a motor vehicle, as a function of its relative speed with respect to the surrounding atmosphere. This shutter and the fan speed are controlled through a rod adjustable in length and connected at one end to the movable wall of bellows forming a vacuum chamber and at the other end to the movable member of a rheostat and/or switch inserted in the electric circuit for energizing the fan motor, said vacuum chamber communicating with the vacuum area of a Venturi choke receiving the incoming air flow due to the relative wind.
Inventors
- 👤 A Lefeuvre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:23
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00642; B60H1/00735; B60H1/00764
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
Automatic control device for the air-intake shutter of a ventilation system for a motor vehicle comprising a fan driven by an electric motor, an air-intake shutter, movable electrical control member interposed in the power circuit of said electric motor, means adapted to engage said shutter with said movable electrical control member to rotate said shutter, a Venturi choke having its air inlet fed with the relative wind created by the vehicle motion, a vacuum chamber having a movable end wall, means communicating said vacuum chamber with the depression zone of said Venturi choke, rigid means connecting said movable end-wall of said vacuum chamber with said movable electrical control member, and said movable electrical control member being rigid with a tapped socket engaged by the screw-threaded portion of a control rod adapted, by rotating a control knob associated therewith, to preset the distance between said movable member and said vacuum chamber.
Claim 2
Dependent Claim
150 words
Automatic control device for the air-intake shutter of a ventilation system for a motor vehicle comprising a fan driven by an electric motor, an air-intake shutter, movable electrical control member interposed in the power circuit of said electric motor, means adapted to engage said shutter with said movable electrical control member to rotate said shutter, a Venturi choke having its air inlet fed with the relative wind created by the vehicle motion, a vacuum chamber having a movable end wall, means communicating said vacuum chamber with the depression zone of said Venturi choke, rigid means connecting said movable end-wall of said vacuum chamber with said movable electrical control member, and said movable electrical control member being rigid with a tapped socket engaged by the screw-threaded portion of a control rod adapted, by rotating a control knob associated therewith, to preset the distance between said movable member and said vacuum chamber.
Claim 3
Dependent Claim
14 words
Device according to claim 1, wherein said movable electrical control member is a rheostat.
Claim 4
Dependent Claim
23 words
Device according to claim 1, wherein said shutter is urged to its open position by having its fulcrum slightly off-set from its diameter.
Claim 5
Dependent Claim
36 words
Device according to claim 1, wherein said movable end wall of said vacuum chamber is connected to the fixed end wall through variable-flexibility resilient means, the chamber tightness being provided by using a reinforced bellows structure.
Claim 6
Dependent Claim
21 words
Device according to claim 4, wherein said variable-flexibility resilient connecting means comprise at least two coil compression springs having different diameters.
Claim 7
Dependent Claim
18 words
Device according to claim 1, wherein said choke is disposed longitudinally in front of the relative air flow.
Claim 8
Dependent Claim
39 words
Device according to claim 1, wherein said choke is disposed transversely and supplied with air from the relative air flow created by the vehicle during its operation through a duct having its inlet directed towards the incoming air flow.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |