US3797967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic throttle actuator
Assignee: Individual
•
Filing: 1972-05-10
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Granted: 1974-03-19
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Expires: 1992-05-10
Abstract
Abstract A throttle actuator for accelerating and decelerating the speed of an internal combustion engine in response to work demand where the engine drives the pump of a hydraulic system. In one aspect, the invention is directed to a throttle actuating piston and rod arrangement for operating the throttle of the engine and a pulsation intensifier for sensitively controlling the piston''s movement. The pulsation intensifier is connected in a pressure line from the pump and comprises a free spring biased floating piston of configuration such that there is a differential in area across the piston for fluid pressure intensification purposes. The intensifier piston in one embodiment also has an axial passage therethrough and an orifice communicating with the throttle actuating piston. Both pistons are slidably mounted in housings which have springs to normally position the pistons in directions to cause the engine to return to idle speed when there is no work demand.
Inventors
- 👤 D Howeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:44
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/20; F02; F02D; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0235
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
227 words
In a hydraulic system or operating a work performing apparatus and including a hydraulic fluid pump driven by a primary power source controlled by a hydraulic actuator having an actuator cylinder with an actuator piston located therein and coupled to said primary power source for control purposes, the improvement comprising: a fluid pressure intensifier including an intensifier cylinder having a free-floating intensifier piston located for movement therein. a line connecting one end of said intensifier cylinder with a pressure line of said hydraulic system, the other end of said intensifier cylinder being in fluid communication with said actuator cylinder by way of an opening in said actuator cylinder on one side of said actuator piston, biasing means for normally urging said actuator piston toward said opening in said actuator cylinder, said intensifier piston having oppositely facing surfaces of different areas to be exposed to hydraulic fluid for providing a differential in area across said intensifier piston for fluid pressure intensification purposes, the larger of said surfaces facing said one end of said intensifier cylinder, biasing means for normally urging said intensifier piston toward said one end of said cylinder, and a continuously open passageway including a restrictive orifice communicating between the ends of said intensifier cylinder on opposite sides of said intensifier piston for providing a twoway fluid flow passageway between the ends of said intensifier cylinder.
Claim 2
Dependent Claim
227 words
In a hydraulic system or operating a work performing apparatus and including a hydraulic fluid pump driven by a primary power source controlled by a hydraulic actuator having an actuator cylinder with an actuator piston located therein and coupled to said primary power source for control purposes, the improvement comprising: a fluid pressure intensifier including an intensifier cylinder having a free-floating intensifier piston located for movement therein. a line connecting one end of said intensifier cylinder with a pressure line of said hydraulic system, the other end of said intensifier cylinder being in fluid communication with said actuator cylinder by way of an opening in said actuator cylinder on one side of said actuator piston, biasing means for normally urging said actuator piston toward said opening in said actuator cylinder, said intensifier piston having oppositely facing surfaces of different areas to be exposed to hydraulic fluid for providing a differential in area across said intensifier piston for fluid pressure intensification purposes, the larger of said surfaces facing said one end of said intensifier cylinder, biasing means for normally urging said intensifier piston toward said one end of said cylinder, and a continuously open passageway including a restrictive orifice communicating between the ends of said intensifier cylinder on opposite sides of said intensifier piston for providing a twoway fluid flow passageway between the ends of said intensifier cylinder.
Claim 3
Dependent Claim
20 words
The hydraulic system of claim 1 wherein said continuously open passageway including said restrictive orifice extends through said intensifier piston.
Claim 4
Dependent Claim
34 words
The hydraulic system of claim 1 wherein said continuously open passageway including said restrictive orifice comprise a two-way fluid passageway coupled to opposite ends of said intensifier cylinder and which bypasses said intensifier cylinder.
Claim 5
Dependent Claim
50 words
The hydraulic system of claim 1 wherein: said means for biasing said actuator piston comprises a return spring, a spring adjustment means for adjusting the return force of said return spring, and an adjustable stop operable independently of said spring adjustment means for adjusting the stroke of said actuator piston.
Claim 6
Dependent Claim
54 words
The hydraulic system of claim 1 comprising: a piston rod coupled to said actuator piston for movement therewith and extending outwardly of an end of said actuator cylinder, said primary power source includes an internal combustion engine having a throttle with an accelerator lever, and means coupling said piston rod to said actuator lever.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |