US3841395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control for vehicle passenger space
Assignee: Robert Bosch GmbH
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Filing: 1973-01-15
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Granted: 1974-10-15
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Expires: 1993-01-15
Abstract
Abstract A blower supplies outside air to two ducts in one of which the air may be heated in cold weather and in the other of which air may be cooled in warm weather. At the downstream junction of these ducts a flap valve, positioned by a thermosensitive expansion element located in the cooler of the two air streams, determines the proportion in which the two air streams will contribute to the air delivered to the passenger space. A vent of small cross-section downstream from the thermosensitive element assures a minimum flow of the cooler air stream sufficient to actuate the control.
Inventors
- 👤 H Steinmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:25
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00007; B60H1/00021; B60H1/00035; B60H1/00057
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
A system for maintaining constant thE temperature of an air space comprising: blower means including a blower and two output ducts for delivering, respectively, two air streams of different temperatures, to a duct junction and including also means for supplying said blower with fresh air; main delivery duct means for delivering air from said duct junction towards said air space; mixing valve vane (20) means in or at said duct junction for determining by its position the relative proportion of air from said two air streams to be delivered by said main delivery duct means; thermosensitive means (21) for positioning said vane means in response to the temperature of the cooler of said air streams and for decreasing, under increasing temperature of said cooler stream, the proportion of said warmer stream to be delivered through said main delivery duct and for increasing, under decreasing temperature of said cooler stream, the proportion of said warmer stream so delivered, said thermosenstive means being in the form of a positioning member connected to said vane means.
Claim 2
Independent Claim
173 words
A system for maintaining constant thE temperature of an air space comprising: blower means including a blower and two output ducts for delivering, respectively, two air streams of different temperatures, to a duct junction and including also means for supplying said blower with fresh air; main delivery duct means for delivering air from said duct junction towards said air space; mixing valve vane (20) means in or at said duct junction for determining by its position the relative proportion of air from said two air streams to be delivered by said main delivery duct means; thermosensitive means (21) for positioning said vane means in response to the temperature of the cooler of said air streams and for decreasing, under increasing temperature of said cooler stream, the proportion of said warmer stream to be delivered through said main delivery duct and for increasing, under decreasing temperature of said cooler stream, the proportion of said warmer stream so delivered, said thermosenstive means being in the form of a positioning member connected to said vane means.
Claim 3
Dependent Claim
91 words
A system for maintaining constant temperature as defined in claim 1 in which said vane means (20) is adapted in its extreme positions to exclude air of one or the other of said streams from said main delivery duct means and in which an auxiliary delivery duct of relatively small cross section (7) is provided with connections such as to assure that a flow of air of said cooler stream flows past said thermosensitive means (21) even when air of said cooler stream is exculded from said main delivery duct means.
Claim 4
Dependent Claim
95 words
A system for maintaining constant temperature as defined in claim 1 in which a heat exchanger adapted to serve as a heating element is assoicated with the duct through which said warmer air stream flows from said blower to said mixing valve vane means and in which a second heat exchanger adapted to serve as a cooling element is associated with the duct through which said cooler air stream flows from said blower to said mixing valve vane means and in which said thermosensitive means (21) is positioned downstream of said cooling heat exchanger (11).
Claim 5
Dependent Claim
35 words
A system for maintaining constant temperature as defined in claim 3 in which the two said heat exchangers (10, 11) are adapted to be alternately placed in operation by a manual switching or changeover device.
Claim 6
Dependent Claim
32 words
A system for maintaining constant temperature as defined in claim 3 in which the two said heat exchangers (10, 11) are arranged to be placed alternatively in operation by a thermostatic device.
Claim 7
Dependent Claim
37 words
A system for maintaining constant temperature as defined in claim 5 in which said thermostatic device constitutes means for placing one or the other of said heat exchangers in operation in dependence upon the outside air temperature.
Claim 8
Dependent Claim
32 words
A system for maintaining constant temperature as defined in claim 1 in which said thermosensitive means (21) is or includes an expansible material element and is directly responsive to the expansion thereof.
Claim 9
Dependent Claim
26 words
A system for maintaining a constant temperature as defined in claim 1 in which said thermosensitive means (21) is or contains a liquid filled expansion element.
Claim 10
Dependent Claim
49 words
A system for maintaining constant temperature as defined in claim 1 in which directly downstream of said thermosensitive means in the path of said cooler air stream an air exit (7) of relatively small cross-section is provided, whereby said cooler air stream is assured a minimum rate of flow.
Claim 11
Dependent Claim
37 words
A system for maintaining constant temperature as defined in claim 1 in which said thermosensitive means (21) is so constructed that it possesses a variable thermal time constant that is variable in response to an operating condition.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |