US4176630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control valves
Assignee: Dynair Ltd
•
Filing: 1977-06-01
•
Granted: 1979-12-04
•
Expires: 1997-06-01
Abstract
Abstract The invention provides a pneumatic control system for a pneumatically operated clutch in the drive to a cooling fan of a vehicle engine. There are two thermostat valves arranged in series in the pneumatic control line. One valve is positioned in the supercharged air passage and the other valve is in the liquid coolant passage. If the temperature at either valve becomes excessive the supply line 22 is connected to relief and the fan clutch automatically engages.
Inventors
- 👤 Arthur E. H. Elmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:14
CPC Classifications
F; F16; F16D; F16D35/00; F16D35/02; F16D35/021; F01; F01P; F01P7/00; F01P7/02; F01P7/08; F01P7/081; F01P7/082; F01P7/085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
Apparatus for controlling the flow of a pressure fluid to a fluid actuator operatively connected to a variable speed drive in the rotary transmission to a cooling fan for a vehicle motor, including two automatic temperature sensing fluid control valves connected in series between a source of pressure fluid and the said fluid actuator, each valve having two operative positions in one of which the valve connects an inlet port to an outlet port, while in the other position it closes the connection between the inlet and outlet ports and connects the outlet port to a relief passage, the arrangement being such that when either valve is in its second position the pressure line leading to the actuator is disconnected from the pressure supply and connected to relief, and in which each of the two valves is directly exposed to a fluid flow associated with said vehicle motor so as to sense the fluid temperature directly.
Claim 2
Dependent Claim
156 words
Apparatus for controlling the flow of a pressure fluid to a fluid actuator operatively connected to a variable speed drive in the rotary transmission to a cooling fan for a vehicle motor, including two automatic temperature sensing fluid control valves connected in series between a source of pressure fluid and the said fluid actuator, each valve having two operative positions in one of which the valve connects an inlet port to an outlet port, while in the other position it closes the connection between the inlet and outlet ports and connects the outlet port to a relief passage, the arrangement being such that when either valve is in its second position the pressure line leading to the actuator is disconnected from the pressure supply and connected to relief, and in which each of the two valves is directly exposed to a fluid flow associated with said vehicle motor so as to sense the fluid temperature directly.
Claim 3
Dependent Claim
27 words
Apparatus according to claim 1, in which at least one of said valves is arranged to sense the temperature of a cooling fluid for said vehicle motor.
Claim 4
Dependent Claim
72 words
Apparatus according to claim 1, in which one of said valves is located in a liquid coolant circuit for said motor and the other valve is located in a supercharger air supply duct to said motor, both said liquid coolant circuit and said supercharger duct having radiators through which air is impelled by said cooling fan, and said valves being located in said circuit and duct at positions downstream of said radiators.
Claim 5
Dependent Claim
53 words
Apparatus according to claim 1, in which at least one of said valves includes an automatic pressure sensing system responsive to the fluid pressure at the valve inlet port arranged to move the valve into its second operative position when the pressure in the inlet to the valve falls below a pre-selected value.
Claim 6
Dependent Claim
14 words
Apparatus according to claim 1, in combination with a clutch actuated by the actuator.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 5, and a rotary body driven in rotation by said clutch when said clutch is engaged.
References Cited (Backward Citations)
US2231292A
Cited
US2125889A
Cited
US2452007A
Cited
GB785143A
Cited
US3203499A
Cited
US3388694A
Cited
US3684397A
Cited
DE2237979A1
Cited
US3872842A
Cited
US3902663A
Cited
US3961606A
Cited
US4062188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |