US3807631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating,ventilating and defrosting system for vehicles
Assignee: Volkswagen AG
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Filing: 1972-12-01
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Granted: 1974-04-30
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Expires: 1992-12-01
Abstract
Abstract A heating, ventilating and defrosting system for vehicles has a mixing flap mounted in a heater housing movably about a pivot axis between first and second angular positions. In the first position, the mixing flap forms first and second seals with the housing respectively at opposite sides thereof and closes off all flow in the housing through and around the heater. In the second position, it forms at least a third seal with the housing and closes off flow in the housing around the heater but permits flow through the heater. In positions between the first and second positions, it permits various partial flows in the housing through and around the heater. The mixing flap and the housing are relatively configured so that the first seal closes before and opens after the second seal when the flap pivots back and forth between the first and second positions. It is thus possible to adjust the system to permit variable flow in the housing around the heater to passenger-compartment and defroster outlets formed in the housing downstream of the heater while preventing flow through the heater.
Inventors
- 👤 P Mohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:32
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00007; B60H1/00021; B60H1/00064; B60H1/00071; B60H1/00642; B60H1/00664; B60H1/00671
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
231 words
A heating, ventilating and defrosting system for vehicles, comprising a housing formed with a fresh-air inlet, a passengercompartment outlet, and a defroster outlet, a heater mounted within the housing downstream of the fresh-air inlet and upstream of the passenger-compartment and defroster outlets and extending over only a part of the cross-sectional flow area of the housing, a mixing flap, means mounting the mixing flap in the housing movably about a pivot axis between first and second angular positions, the mixing flap in said first position being upstream of the heater, forming first and second seals with the housing respectively at opposite sides thereof and closing off all flow in the housing through and around the heater, in said second position forming at least a third seal with the housing and closing off flow in the housing around the heater but permitting flow through the heater, and, in positions between said first and second positions, permitting variouS partial flows in the housing through and around the heater, the mixing flap and the housing being relatively configured so that said first seal closes before and opens after said second seal when the flap pivots back and forth between said first and second positions, whereby it is possible to adjust the system to permit variable flow in the housing around the heater to the passenger-compartment and defroster outlets while preventing flow through the heater.
Claim 2
Dependent Claim
231 words
A heating, ventilating and defrosting system for vehicles, comprising a housing formed with a fresh-air inlet, a passengercompartment outlet, and a defroster outlet, a heater mounted within the housing downstream of the fresh-air inlet and upstream of the passenger-compartment and defroster outlets and extending over only a part of the cross-sectional flow area of the housing, a mixing flap, means mounting the mixing flap in the housing movably about a pivot axis between first and second angular positions, the mixing flap in said first position being upstream of the heater, forming first and second seals with the housing respectively at opposite sides thereof and closing off all flow in the housing through and around the heater, in said second position forming at least a third seal with the housing and closing off flow in the housing around the heater but permitting flow through the heater, and, in positions between said first and second positions, permitting variouS partial flows in the housing through and around the heater, the mixing flap and the housing being relatively configured so that said first seal closes before and opens after said second seal when the flap pivots back and forth between said first and second positions, whereby it is possible to adjust the system to permit variable flow in the housing around the heater to the passenger-compartment and defroster outlets while preventing flow through the heater.
Claim 3
Dependent Claim
59 words
A heating, ventilating and defrosting system for vehicles according to claim 1 wherein the housing adjacent to the first seal is formed with an inner wall describing in section a circular arc centered on said pivot axis, so that said first seal is maintained during a certain range of angular movement of the flap adjacent to said first position.
Claim 4
Dependent Claim
73 words
A heating, ventilating and defrosting system for vehicles according to claim 1 further comprising a second flap cooperating with the passenger-compartment and defroster outlets and selectively movable to a first position in which it closes the passenger-compartment outlet and leaves the defroster outlet open, a second position in which it leaves the passenger-compartment and defroster outlets open, and a third position in which it separates the passenger-compartment and defroster outlets from the heater.
Claim 5
Dependent Claim
72 words
A heating, ventilating and defrosting system for vehicles according to claim 1 wherein said second and third seals are formed by cooperation of spaced-apart portions of the housing with generally the same portion of the mixing flap and wherein the housing is contoured so that it is spaced apart from the path of movement of said portion of the mixing flap as the mixing flap moves between said first and second positions.
Claim 6
Dependent Claim
78 words
A heating, ventilating and defrosting system for vehicles according to claim 1 wherein the housing is formed with a supplemental passenger-compartment outlet downstream of the fresh-air inlet and upstream of the heater and wherein the mixing flap in said second position forms a fourth seal with the housing, said fourth seal being upstream of the supplemental passenger-compartment outlet, so that, when the mixing flap is in said second position, it closes off flow through the supplemental passenger-compartment outlet.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |