US3750555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Installation for prevention of draft in the interior space of motor vehicles
Assignee: Daimler Benz AG
•
Filing: 1971-05-20
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Granted: 1973-08-07
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Expires: 1991-05-20
Abstract
Abstract An installation for preventing a draft in the interior space of motor vehicles equipped with air discharge openings in the vehicle rear section to provide a ventilation, in which the discharge openings are provided with an automatically controllable closure flap.
Inventors
- 👤 H Gotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:12
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/24; B60H1/248
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
An installation for the prevention of drafts in the interior space of motor vehicles which are provided with air discharge aperture means in the vehicle rear section, characterized in that the air discharge aperture means are provided with an automatically controllable closure flap means, and control means for automatically controlling the closure flap means in dependence on the pressure difference between the air in the vehicle interior and the outside air, said control means including a pressure-measuring means in the vehicle interior which is adapted to be acted upon on one side with outside pressure and the other with the pressure in the vehicle interior and whose movement actuates a switch means.
Claim 2
Dependent Claim
112 words
An installation for the prevention of drafts in the interior space of motor vehicles which are provided with air discharge aperture means in the vehicle rear section, characterized in that the air discharge aperture means are provided with an automatically controllable closure flap means, and control means for automatically controlling the closure flap means in dependence on the pressure difference between the air in the vehicle interior and the outside air, said control means including a pressure-measuring means in the vehicle interior which is adapted to be acted upon on one side with outside pressure and the other with the pressure in the vehicle interior and whose movement actuates a switch means.
Claim 3
Dependent Claim
23 words
An installation according to claim 1, characterized in that said pressure-measuring means is a pressure diaphragm and said switch means is a microswitch.
Claim 4
Dependent Claim
33 words
An installation according to claim 1, characterized in that said switch means is electrically and operatively connected with a magnetic shifting means for an auxiliary force element acting on the closure flap means.
Claim 5
Dependent Claim
59 words
An installation according to claim 3, characterized in that the magnetic shifting means includes an armature and a spring biasing the armature, the auxiliary force element with a non-energized magnetic shifting means being adapted to be acted upon with outside pressure as a result of the closure movement of the armature initiated by the spring engaging at the armature.
Claim 6
Dependent Claim
25 words
An installation according to claim 4, characterized in that said armature is connected with a plunger cooperating with a line leading to the vacuum source.
Claim 7
Dependent Claim
59 words
An installation according to claim 3, characterized in that the vehicle rear section is provided with a fuel tank having a vent line extending therefrom, the vent line being provided with a free end serving as a measuring place for the outside pressure, and means for conducting the outside pressure from the free end to the pressure measuring means.
Claim 8
Dependent Claim
33 words
An installation according to claim 6, characterized in that the auxiliary force element is adapted to be connected with a vacuum source by a line and by way of the magnetic shifting means.
Claim 9
Dependent Claim
21 words
An installation according to claim 7, characterized in that said vacuum source is the suction pipe of an internal combustion engine.
Claim 10
Dependent Claim
59 words
An installation according to claim 7, characterized in that the magnetic shifting means includes an armature and a spring biasing the armature, the auxiliary force element with a non-energized magnetic shifting means being adapted to be acted upon with outside pressure as a result of the closure movement of the armature initiated by the spring engaging at the armature.
Claim 11
Dependent Claim
25 words
An installation according to claim 9, characterized in that said armature is connected with a plunger cooperating with a line leading to the vacuum source.
Claim 12
Dependent Claim
23 words
An installation according to claim 10, characterized in that said pressure-measuring means is a pressure diaphragm and said switch means is a microswitch.
Claim 13
Dependent Claim
21 words
An installation according to claim 11, characterized in that said vacuum source is the suction pipe of an internal combustion engine.
Claim 14
Dependent Claim
59 words
An installation according to claim 1, characterized in that the vehicle rear section is provided with a fuel tank having a vent line extending therefrom, the vent line being provided with a free end serving as a measuring place for the outside pressure, and means for conducting the outside pressure from the free end to the pressure measuring means.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |