US3795177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid motor control circuit providing selective fast motion
Assignee: Caterpillar Inc
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Filing: 1971-11-04
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Granted: 1974-03-05
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Expires: 1991-11-04
Abstract
Abstract A system having a manually operated control valve for directing pressurized fluid to a pair of fluid motors while receiving fluid discharged therefrom also has a fast motion valve for causing the motors to outrun the fluid supplied through the control valve by returning a portion of the discharged fluid directly to the motors. The circuit shifts to provide fast motion on detecting a predetermined flow rate between the control valve and the motors. As the operator can modulate this flow rate, the fast motion is always subject to operator control. To assure operator control under all conditions, the fast motion valve is spring biased to the unoperated position and return of a portion of the motor discharge flow to the control valve is a necessary condition for operation of the fast motion valve. The system is further arranged to prohibit fast motion, under any condition, during reversed motion of the motors.
Inventors
- 👤 J Cryder
- 👤 A Freedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:18
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/024; F15B2011/0243; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3056; F15B2211/30565; F15B2211/3058; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/3144; F15B2211/315; F15B2211/3157; F15B2211/31588; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/70; F15B2211/71; F15B2211/7114; F15B2211/7128; F15B2211/75
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
301 words
A control circuit for fluid motor means which has first and second flow passages communicated therewith and wherein application of pressurized fluid to said first flow passage operates said motor means in one direction while fluid is discharged through said second passage and the application of pressurized fluid to said second passage operates said motor means in a reverse direction while discharging fluid through said first passage, comprising: a source of said pressurized fluid; a control valve connected between said source and said first and second flow passages to said motor means and having one position supplying said pressurized fluid to said first passage while receiving discharge fluid through said second passage, said control valve having an additional position supplying said pressurized fluid to said second flow passage while receiving discharge fluid through said first passage; a valve body forming a portion of said second flow passage between said control valve and said motor means and having a flow path communicated with said first flow passage; a valve member within said body and having a first position at which fluid flow in said second passage is confined to flow between said control valve and said motor means and having another position at which a portion only of said flow through said second flow passage is diverted to said flow path that communicates with said first flow passage; resilient means for urging said valve member toward said first position thereof; means forming a flow constriction in one of said flow passages for producing a fluid pressure differential across said constriction which is a function of the flow rate therethrough, and means for causing said fluid pressure differential to act on said valve member to urge said valve member toward said additional position thereof while said motor means operates in said one direction.
Claim 2
Dependent Claim
301 words
A control circuit for fluid motor means which has first and second flow passages communicated therewith and wherein application of pressurized fluid to said first flow passage operates said motor means in one direction while fluid is discharged through said second passage and the application of pressurized fluid to said second passage operates said motor means in a reverse direction while discharging fluid through said first passage, comprising: a source of said pressurized fluid; a control valve connected between said source and said first and second flow passages to said motor means and having one position supplying said pressurized fluid to said first passage while receiving discharge fluid through said second passage, said control valve having an additional position supplying said pressurized fluid to said second flow passage while receiving discharge fluid through said first passage; a valve body forming a portion of said second flow passage between said control valve and said motor means and having a flow path communicated with said first flow passage; a valve member within said body and having a first position at which fluid flow in said second passage is confined to flow between said control valve and said motor means and having another position at which a portion only of said flow through said second flow passage is diverted to said flow path that communicates with said first flow passage; resilient means for urging said valve member toward said first position thereof; means forming a flow constriction in one of said flow passages for producing a fluid pressure differential across said constriction which is a function of the flow rate therethrough, and means for causing said fluid pressure differential to act on said valve member to urge said valve member toward said additional position thereof while said motor means operates in said one direction.
Claim 3
Dependent Claim
39 words
The combination defined in claim 1 further comprising means for causing said pressure differential to act on said valve member in the same direcTion that said resilient means acts thereon while said motor means operates in said reverse direction.
Claim 4
Dependent Claim
61 words
The combination defined in claim 1 wherein said motor means comprises a pair of fluid motors and wherein said first and second flow passages are branched to communicate with each of said motors and wherein said second flow passage communicates said control valve directly with one of said motors and communicates with the other of said motors through said valve body.
Claim 5
Dependent Claim
106 words
The combination defined in claim 3 wherein said means forming a flow constriction is situated in said first flow passage and wherein said means for causing said fluid pressure differential to act on said valve member comprises a conduit connecting said valve body with said first passage at a point therein between said flow constriction and said fluid motors and another conduit connecting said valve body to said first flow passage at a point therein between said flow constriction and said control valve, and means for causing the fluid pressures within said conduits to act on opposite sides of said valve member within said valve body.
Claim 6
Dependent Claim
84 words
The combination defined in claim 1 wherein said fluid motor means comprises a pair of fluid motors and wherein said first and second flow passages are both branched to communicate with each of said fluid motors and wherein said valve body forms a portion of said second flow passage between said control valve and each of said motors, said means forming a flow restriction being situated in said second flow passage between said flow path to said first flow passage and said control valve.
Claim 7
Dependent Claim
21 words
The combination defined in claim 5 wherein said means forming a flow constriction forms a flow orifice through said valve member.
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |