Patent US1589783A successfully refreshed from Google Patents.
US3576192A
Expired / Lapsed
US
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Hydraulic uniflow control unit
Assignee: CAPILANO ENGINEERING Co Ltd
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Filing: 1969-11-10
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Granted: 1971-04-27
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Expires: 1989-11-10
Abstract
Abstract There is disclosed a hydraulic control unit particularly for use in steering apparatus for boats, and in which the hydraulic fluid always flows in the same direction. The unit has pressure passages having ends to be connected to opposite sides of a pumping unit and opposite ends to be connected to the device to be controlled, such as the opposite ends of a slave cylinder which operates the rudder of a boat. A shuttle valve normally closes off the pressure passages and shuts them off from a common return passage which is connected to the reservoir of the pumping unit. When hydraulic fluid flows through one pressure passage, it shifts the shuttle valve to open the passage and connect the other passage to the return passage. The flowing fluid also passes through a check valve in the pressure passage and shifts a lock spool to open a corresponding check valve in the other pressure passage.
Inventors
- 👤 Ray A R Wood
- 👤 Robert A Atkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:20
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/08; B63H25/14; B63H25/18; B63H25/22; F; F15; F15B; F15B7/00; F15B7/001; F15B7/005; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
202 words
A hydraulic uniflow control unit comprising a body, first and second pressure passages extending through the body and having inlet ends to be connected to opposite pressure sides of at least one reversible pump unit and outlet ends to be connected to opposite ends of an operation cylinder, return passage means in the body connected to both of said pressure passages and to be Connected to the return of said pump unit, a shuttle valve slidably mounted in the body and normally shutting both of said pressure passages and closing off the return passage means from both of said pressure passages to prevent fluid from flowing through said pressure passages and said passage means, said shuttle valve being moved by fluid flowing through the first passage to permit said flow and to permit fluid to flow from the second passage outlet end to the return passage means and vice versa, a check valve in each pressure passage normally preventing fluid from flowing therein from the outlet end to the inlet end thereof, and a lock spool slidable mounted in the body and positioned to unseat the check valve of the second passage when fluid flows through the first passage and vice versa.
Claim 2
Dependent Claim
202 words
A hydraulic uniflow control unit comprising a body, first and second pressure passages extending through the body and having inlet ends to be connected to opposite pressure sides of at least one reversible pump unit and outlet ends to be connected to opposite ends of an operation cylinder, return passage means in the body connected to both of said pressure passages and to be Connected to the return of said pump unit, a shuttle valve slidably mounted in the body and normally shutting both of said pressure passages and closing off the return passage means from both of said pressure passages to prevent fluid from flowing through said pressure passages and said passage means, said shuttle valve being moved by fluid flowing through the first passage to permit said flow and to permit fluid to flow from the second passage outlet end to the return passage means and vice versa, a check valve in each pressure passage normally preventing fluid from flowing therein from the outlet end to the inlet end thereof, and a lock spool slidable mounted in the body and positioned to unseat the check valve of the second passage when fluid flows through the first passage and vice versa.
Claim 3
Dependent Claim
125 words
A control unit as claimed in claim 1 in which each pressure passage has two parallel intermediate branches, one branch of each pressure passage being in communication with the inlet end of said each pressure passage and the other of said branches of said each pressure passage being in communication with said return passage means, said shuttle valve has two sections, said sections normally closing off both of the branches of both of said pressure passages, and when moved by fluid in the first pressure passage the shuttle valve uncovers the branch which is in communication with the inlet of the first pressure passage and uncovers the branch of the second pressure passage which is in communication with said return passage means, and vice versa.
Claim 4
Dependent Claim
116 words
A control unit as claimed in claim 2 in which said lock spool has one end exposed to fluid in the first pressure passage between the two intermediate branches thereof and the check valve therein and an opposite end exposed to fluid in the second pressure passage between the two intermediate branches thereof and the check valve therein, and including pins on opposite ends of the lock spool and extending towards adjacent check valve, and when fluid in the first pressure passage flows against the adjacent end of the lock spool, the latter is shifted to cause the pin on its opposite end to open the check valve in the second pressure passage and vice versa.
Claim 5
Dependent Claim
114 words
A control unit as claimed in claim 1 in which said lock spool has one end exposed to fluid in the first pressure passage between the inlet end thereof and the check valve therein and an opposite end exposed to fluid in the second pressure passage between the inlet end thereof and the check valve therein, and including pins on opposite ends of the lock spool and extending towards adjacent check valves, and when fluid in the first pressure passage flows against the adjacent end of the lock spool, the latter is shifted to cause the pin on its opposite end to open the check valve in the second pressure passage and vice versa.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |