초록 ▼

An electronic control device for opening and closing valves in a valve assembly that actuates a variable pitch fan system capable of operating in a plurality of fan blade pitch positions including a temperature switch actuated in response to a temperature condition of the engine, a pressure switch i

An electronic control device for opening and closing valves in a valve assembly that actuates a variable pitch fan system capable of operating in a plurality of fan blade pitch positions including a temperature switch actuated in response to a temperature condition of the engine, a pressure switch in series with the temperature switch and actuated in response to a pressure condition of the variable pitch fan system, and a time delay relay control in parallel with the temperature switch and the pressure switch for transmitting a timed signal therefrom. The device also includes a first solenoid in series with the pressure switch, a second solenoid in series with the time delay relay control and connected to the first solenoid, and wherein transmission of at least one of the timed signal, the temperature condition signal, and the pressure condition signal opens or closes the valves of the valve assembly of the variable pitch fan system.

대표청구항 ▼

An electronic control device for opening and closing valves in a valve assembly that actuates a variable pitch fan system capable of operating in a plurality of fan blade pitch positions including a temperature switch actuated in response to a temperature condition of the engine, a pressure switch i

An electronic control device for opening and closing valves in a valve assembly that actuates a variable pitch fan system capable of operating in a plurality of fan blade pitch positions including a temperature switch actuated in response to a temperature condition of the engine, a pressure switch in series with the temperature switch and actuated in response to a pressure condition of the variable pitch fan system, and a time delay relay control in parallel with the temperature switch and the pressure switch for transmitting a timed signal therefrom. The device also includes a first solenoid in series with the pressure switch, a second solenoid in series with the time delay relay control and connected to the first solenoid, and wherein transmission of at least one of the timed signal, the temperature condition signal, and the pressure condition signal opens or closes the valves of the valve assembly of the variable pitch fan system. is concave.9. The portable computer as defined in claim 6 wherein the means for attaching include tabs.10. The portable computer as defined in claim 9 wherein some of the tabs include fastener apertures formed therein.11. An information handling system comprising: a chassis; a microprocessor mounted in the chassis; an input coupled to provide input to the microprocessor; a storage coupled to the microprocessor; a base surface provided on the chassis; and the input including a keyboard mounted on the base surface, the keyboard including: a support plate having opposed peripheral edges, a first surface and a second surface, the second surface being convex;a plurality of keys supported adjacent the first surface; anda retainer member extending from each of the opposed edges of the support plate for attachment to the base for flexing the convex second surface into abutment with the base surface.12. The information handling system as defined in claim 11 wherein the support plated is bowed.13. The information handling system as defined in claim 11 wherein the first surface is concave.14. The information handling system as defined in claim 11 wherein the retainer member includes a plurality of tabs.15. The information handling system as defined in claim 14 wherein some of the tabs include fastener apertures formed therein.16. A method of mounting a keyboard comprising: providing a base including a base surface; providing a support plate; forming the support plate to include a first surface and a convex second surface; mounting a plurality of keys on the first surface; providing retainer members on peripheral edges of the support plate; positioning the second surface in abutment with the base surface; and securing the retainer members on the base, whereby the convex second surface is flexed into abutment with the base surface in response to the securing. 17. The method as defined in claim 16 further comprising: mounting a membrane on the first surface between the support plate and the keyboard. 18. The method as defined in claim 16 wherein the forming includes bowing the support plate to form an arcuate cross-section.