Patent US3762433A successfully refreshed from Google Patents.
US3762433A
Expired / Lapsed
US
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Automatic fluid flow control for pressure actuated devices
Assignee: Individual
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Filing: 1972-07-26
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Granted: 1973-10-02
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Expires: 1992-07-26
Abstract
Abstract An automatic fluid flow control for pressure actuated devices comprising means for automatically maintaining selected predetermined speeds of operation in response to variations in back pressure produced in the control by varying loads imposed on the work to which the control is operatively connected. The control is installed in a pressure fluid condiut between a fluid source and the work to be actuated thereby. It comprises a housing having a back pressure chamber communicating with the pressure actuated work, a tubular fluid intake member movable in axial directions provided with an opening communicating with the back pressure chamber, a piston and sleeve slidably mounted on the intake member covering the opening to varying degrees, an adjustment member for adjusting the position of the intake member in the housing, and a spring bearing on the adjustment member and the piston, whereby variations in load imposed on the work produce back pressure in the chamber and automatic movement of the piston and sleeve to vary the size of the opening and passage of pressure fluid therethrough to the work to maintain uniform selected predetermined speed of operation of the work.
Inventors
- 👤 R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:32
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/103; G05D16/106; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7738; Y10T137/7781; Y10T137/7784; Y10T137/7792
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
218 words
An automatic fluid flow control for pressure actuated work for maintaining uniform selected predetermined speed of operation of the work under varying load conditions comprising a. a housing having a back pressure chamber therein communicating with the work to be actuated by the controlled fluid flow, b. a tubular fluid intake member movable in axial directions relatively to the housing mounted in the housing in communication with a pressure fluid source, c. an opening in the intake member permitting passage of fluid from the intake member to the back pressure chamber, d. a piston and sleeve slidably mounted on the intake member and movable to positions wherein the sleeve covers variable areas of the opening, e. an adjustment member mounted in the housing and engaging the intake member for initial adjustment of the position of the intake member, and f. a coiled spring surrounding the intake member and bearing at one end on the piston and at the other end on the adjustment member, whereby variations in the predetermined work load produce variations in back pressure in the back pressure chamber and cause movement of the piston and sleeve to vary the size of the opening in the intake member and consequent passage of pressure fluid therethrough to maintain the selected predetermined speed of operation of the work.
Claim 2
Dependent Claim
218 words
An automatic fluid flow control for pressure actuated work for maintaining uniform selected predetermined speed of operation of the work under varying load conditions comprising a. a housing having a back pressure chamber therein communicating with the work to be actuated by the controlled fluid flow, b. a tubular fluid intake member movable in axial directions relatively to the housing mounted in the housing in communication with a pressure fluid source, c. an opening in the intake member permitting passage of fluid from the intake member to the back pressure chamber, d. a piston and sleeve slidably mounted on the intake member and movable to positions wherein the sleeve covers variable areas of the opening, e. an adjustment member mounted in the housing and engaging the intake member for initial adjustment of the position of the intake member, and f. a coiled spring surrounding the intake member and bearing at one end on the piston and at the other end on the adjustment member, whereby variations in the predetermined work load produce variations in back pressure in the back pressure chamber and cause movement of the piston and sleeve to vary the size of the opening in the intake member and consequent passage of pressure fluid therethrough to maintain the selected predetermined speed of operation of the work.
Claim 3
Dependent Claim
28 words
The control defined by Claim 1, in which the opening in the fluid intake member is triangular in shape, with its apex removed from the piston and sleeve.
Claim 4
Dependent Claim
74 words
The control defined by claim 1, in which the fluid intake member is provided with a bleeder opening which permits restricted passage of fluid from the intake member to the back pressure chamber when there is no back pressure in the chamber, and with a larger opening which permits quickly increased passage of fluid from the intake member to the back pressure chamber when the piston and sleeve are moved by increased back pressure.
Claim 5
Dependent Claim
56 words
The control defined by claim 1, in which the housing is provided with an open end and threads on its inner surface adjacent said end, and in which the adjustment member is a washer having a central threaded opening engaging the intake member and having threads on its periphery which engage the threads on the housing.
Claim 6
Dependent Claim
34 words
The control defined by claim 1, in which the fluid intake member is threaded on its outer surface for reception of a coupling to a pressure fluid source, and for engaging the threaded washer.
Claim 7
Dependent Claim
26 words
The control defined by claim 1, in which the fluid intake member has a central bore larger at the portion connected to the pressure fluid source.
Claim 8
Dependent Claim
32 words
The control defined by claim 1, which includes a lock nut threaded on the intake member and bearing against the adjustment member to retain the intake member in its initially adjusted position.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |