Claims
- 1. An apparatus to automatically control a throttle of an engine which provides power to a hydraulic or pneumatic system, the apparatus comprised of a housing defining a chamber, said chamber having a first opening comprised of a channel having a diameter narrower than said chamber adapted to receive a fluid containing conduit in communication with said system, a piston slidably mounted in said chamber and having a main body portion within said chamber and a first end with a narrower diameter than said main body positioned within said channel which is acted on by a fluid in said conduit, a spring surrounding a portion of said piston within said chamber and biasing said piston towards said first opening, said piston including a second end extending through a second opening in said chamber which controls said throttle, said second opening including an adjustable stop which limits travel of said piston and an adjustable member which controls the compression of said spring.
- 2. The apparatus of claim 1 further comprising a cap positioned on said second end of said piston.
- 3. The apparatus of claim 1 further comprising a seal positioned between an interior wall of said chamber and said first end of said piston.
- 4. The apparatus of claim 2 wherein said cap is threadedly engaged with said second end of said piston.
- 5. The apparatus of claim 1 wherein said adjustable member is threadedly engaged with an interior wall of said chamber.
- 6. The apparatus of claim 5 wherein said adjustable stop is threadedly engaged with an interior wall of said spring.
- 7. The apparatus of claim 1 wherein an outer wall of said housing is threaded.
- 8. The apparatus of claim 1 wherein said piston includes at least three sections having different diameters.
- 9. The apparatus of claim 8 wherein said piston includes two ends having narrowest diameters.
- 10. A throttle control mechanism comprising a cylinder having first and second openings at each end thereof, said cylinder having a threaded outer wall and a first end adapted to mate with a fluid containing conduit, a piston reciprocable within said cylinder and having a fluid inlet end and a throttle control end, said piston having a narrowest diameter adjacent each end, a largest diameter inward from said fluid inlet end, and an intermediate diameter inward from said throttle control end, said cylinder including a main chamber having a diameter sufficient to accommodate said largest diameter of said piston and a passage with a restricted diameter between said main chamber and said first end, said fluid inlet end of said piston extending through said restricted diameter passage which acts as a stop against the largest diameter of said piston, a seal located between said fluid inlet end of said piston and an inner wall of said chamber, a spring surrounding said intermediate diameter portion of said piston within the main chamber of said cylinder, a first end of said spring stopped by the largest diameter portion of said piston and a second end of said spring stopped by a first ring threaded into the second end of said cylinder, a second ring threaded into the interior of the said first ring and creating a passage in said second end of said cylinder large enough to accommodate said smallest diameter of said piston and acting as a stop against said intermediate diameter of said piston, said spring providing a bias against a fluid in said conduit, said spring stop and said piston stop being threadedly adjustable along a longitudinal axis of the said cylinder to tailor the resistance to pressure and travel of said piston.
- 11. The apparatus of claim 10 further comprising a cap positioned on said second end of said piston.
- 12. In combination with an engine having a throttle and a pump driven by said engine, an automatic control device comprising a cylindrical housing having a threaded outer wall and defining a chamber, said chamber having a first opening adapted to receive a fluid containing conduit in communication with said pump, a piston slidably mounted in said chamber and having a first end acted on by a fluid from said conduit, a spring surrounding a portion of said piston within said chamber and biasing said piston towards said first opening, said piston including a second end extending through a second opening in said chamber which controls said throttle, said chamber including a first adjustable stop which limits travel of said piston and a second adjustable stop which controls the compression of said spring, a bracket mounted to said engine and including a threaded portion mated to said threaded outer wall of said automatic control device to facilitate longitudinal axial adjustment thereof.
Parent Case Info
This application is a continuation of provisional application, U.S. Ser. No. 60/025.118, filed Aug. 30, 1996.
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
743161 |
Oct 1954 |
GBX |