US3756282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor controlled fluid valve
Assignee: Enerpac Tool Group Corp
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Filing: 1972-05-30
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Granted: 1973-09-04
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Expires: 1992-05-30
Abstract
Abstract An electric motor controlled hydraulic or pneumatic valve including a valve housing having a main spool positioned to control the flow of fluid from a pressure port to a fluid circuit, the spool including a threaded bore at one end, a high speed low torque reversible electric motor mounted on said housing and being connected to the spool by a threaded rod to provide high torque output to the spool and an electric control circuit including a bridge circuit having a manually controlled variable resistance, a feed back variable resistance mechanically connected to the spool, and a pair of solid state switches or relay circuits connected across the bridge circuit to provide an electric signal to the electric motor in response to movement of the manually controlled variable resistance.
Inventors
- 👤 D Knutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0402; F15B13/044; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614; Y10T137/86622
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
155 words
An electric motor controlled hydraulic or pneumatic valve comprising: a valve housing having a cylindrical bore, a valve spool mounted for axial movement in said bore for controlling the flow of fluid through said valve housing, said spool having a threaded bore in one end, a reversible high speed low torque electric motor mounted on one end of said housing and having an output shaft extending into said cylindrical bore, means for threadedly connecting the output shaft of said motor to said threaded bore, an electric power circuit operatively connected to said motor, and a low power electric control circuit connected to said electric power circuit to control said electric circuit, said control circuit including manual input means and an electric signal means connected to respond to the movement of said valve spool to de-energize said motor upon movement of said valve spool a distance corresponding to the distance of movement of said input means.
Claim 2
Dependent Claim
155 words
An electric motor controlled hydraulic or pneumatic valve comprising: a valve housing having a cylindrical bore, a valve spool mounted for axial movement in said bore for controlling the flow of fluid through said valve housing, said spool having a threaded bore in one end, a reversible high speed low torque electric motor mounted on one end of said housing and having an output shaft extending into said cylindrical bore, means for threadedly connecting the output shaft of said motor to said threaded bore, an electric power circuit operatively connected to said motor, and a low power electric control circuit connected to said electric power circuit to control said electric circuit, said control circuit including manual input means and an electric signal means connected to respond to the movement of said valve spool to de-energize said motor upon movement of said valve spool a distance corresponding to the distance of movement of said input means.
Claim 3
Dependent Claim
57 words
A valve according to claim 1 wherein said power circuit includes a pair of solid state or solenoid switches and said control circuit includes a bridge circuit having a pair of relay circuits connected to actuate one or the other of said solid state or solenoid switches to thereby control the direction of rotation of said motor.
Claim 4
Dependent Claim
66 words
A valve according to claim 1 wherein said manual input means includes a first variable resistance and said electric signal means includes a second variable resistance, a bridge circuit having a first fixed resistance connected in series with said first variable resistance and a second fixed resistance connected in series with said second variable resistance and a pair of relay circuits connected across said bridge circuit.
Claim 5
Dependent Claim
14 words
The valve according to claim 1 including means for manually overriding said drive motor.
Claim 6
Dependent Claim
48 words
The valve according to claim 4 wherein said valve spool includes a drive section and a control section, means for biasing said control section to a null position and said manual override means includes a handle operatively connected to move said control section independent of said drive section.
Claim 7
Dependent Claim
34 words
The valve according to claim 4 wherein said valve spool includes a drive section, a control section and an override section, said manual override means comprising a handle operatively connected to said override section.
Claim 8
Dependent Claim
102 words
An electric motor controlled fluid valve comprising: a valve housing having a cylindrical bore, a valve spool mounted for axial movement in said bore for controlling the flow of fluid through said housing, said spool having a threaded bore at one end, a reversible high speed low torque electric motor mounted on one end of said housing and having an output shaft extending into said cylindrical bore, means for threadedly connecting the output shaft of said motor to said threaded bore, and means for selectively energizing said motor whereby the rotary motion of said motor produces axial movement of said valve spool.
Claim 9
Dependent Claim
102 words
An electric motor controlled fluid valve comprising: a valve housing having a cylindrical bore, a valve spool mounted for axial movement in said bore for controlling the flow of fluid through said housing, said spool having a threaded bore at one end, a reversible high speed low torque electric motor mounted on one end of said housing and having an output shaft extending into said cylindrical bore, means for threadedly connecting the output shaft of said motor to said threaded bore, and means for selectively energizing said motor whereby the rotary motion of said motor produces axial movement of said valve spool.
Claim 10
Dependent Claim
14 words
The valve according to claim 7 including means for manually moving said valve spool.
Claim 11
Dependent Claim
32 words
The valve according to claim 7 wherein said valve spool includes a drive section and a control section, and a manual override means including a lever operatively connected to said control section.
Claim 12
Dependent Claim
75 words
The valve according to claim 7 wherein said means for energizing said motor includes an electric poweR circuit and an electric control circuit connected to control said power circuit, said control circuit having a manual input means and an electric signal feed back means connected to respond to the movement of said valve spool to de-energize said motor upon displacement of said spool a distance corresponding to the distance of movement of said input means.
Claim 13
Dependent Claim
53 words
The valve according to claim 7 wherein said valve spool includes a drive section, a control section and an override section and means for biasing said control section to a null position in said bore and means operatively connected to said override section for moving said control section independently of said drive section.
Claim 14
Dependent Claim
163 words
An electric motor controlled fluid valve comprising: a valve housing having a central flow passage connected to an inlet port, a tank port and a pair of fluid flow ports, a valve spool mounted in said central flow passage to control the flow of fluid between said inlet port and one of said fluid flow ports and between the other of said fluid flow ports and said tank port, said valve spool having a threaded bore at one end, means for preventing rotary motion of said valve spool on axial movement in said passage, a reversible high speed low torque electric motor mounted on one end of said valve housing and having a drive shaft, means threadedly connecting said drive shaft to one said threaded bore in said valve spool, an electric power circuit connected to said motor, and an electric control circuit connected to said power circuit, said control circuit including a manually controlled variable resistance mechanically connected to said valve spool.
Claim 15
Dependent Claim
163 words
An electric motor controlled fluid valve comprising: a valve housing having a central flow passage connected to an inlet port, a tank port and a pair of fluid flow ports, a valve spool mounted in said central flow passage to control the flow of fluid between said inlet port and one of said fluid flow ports and between the other of said fluid flow ports and said tank port, said valve spool having a threaded bore at one end, means for preventing rotary motion of said valve spool on axial movement in said passage, a reversible high speed low torque electric motor mounted on one end of said valve housing and having a drive shaft, means threadedly connecting said drive shaft to one said threaded bore in said valve spool, an electric power circuit connected to said motor, and an electric control circuit connected to said power circuit, said control circuit including a manually controlled variable resistance mechanically connected to said valve spool.
Claim 16
Dependent Claim
43 words
The valve according to claim 12 wherein said control circuit comprises a bridge circuit having a pair of relay switches connected to control said power circuit, said manually controlled variable resistance and said feed back variable resistance being connected in said bridge circuit.
Claim 17
Dependent Claim
45 words
A valve according to claim 12 wherein said valve spool includes a drive section and a control section, means for biasing said control section to a null position in said passage and manual override means for moving said control section independently of said drive section.
Claim 18
Dependent Claim
52 words
A valve according to claim 12 wherein said valve spool includes a drive section, a control section and an override section, means for biasing said control section to a null position in said passage and means for manually moving said override section to move said control section independently of said drive section.
References Cited (Backward Citations)
US3482604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |