Patent US3883783A successfully refreshed from Google Patents.
US3883783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic component positioner for loader vehicles and the like
Assignee: Caterpillar Inc
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Filing: 1973-11-02
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Granted: 1975-05-13
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Expires: 1993-11-02
Abstract
Abstract A conventional hydraulic fluid pump is hydraulically coupled bia a self-centering control valve means to a hydraulic cylinder having a reciprocatable cylinder rod coupled to a vehicle component. An electromagnet is disposed to latch the control valve means in a selected position when energized. Switch means is secured to the hydraulic cylinder, and means for actuating the switch means is secured to the cylinder rod for translation therewith. A logic circuit is connected to the switch means and to the electromagnet, whereby the electromagnet is energized in response to the degree of movement, and a first direction of movement, of the cylinder rod to latch the control valve means. The electromagnet is deenergized via the switch means and the means for actuating, when the cylinder rod reaches a preselected position proceeding from the opposite direction. This unlatches the control valve means which allows it to seek its self-centered position. Thus, fluid flow to the hydraulic cylinder ceases when the vehicle component reaches a preselected position.
Inventors
- 👤 Joe E Fuzzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:04
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
A logic control circuit for energizing and deenergizing a selected device via a given voltage source, said logic control circuit comprising: a conductive device; circuit means operatively associated with said conductive device and adapted to couple said selected device to said voltage source in response to conduction through said conductive device and to uncouple said selected device from said voltage source upon termination of conduction through said conduction device; first and second sequentially operable triggering means having a sequence of operations that after termination of said first triggering means said second triggering means operates and terminates and then operates and terminates again and then said first triggering means operates; means responsive to operation of said first triggering means for rendering said conductive device nonconductive during operation of said first triggering means and for conditioning said conductive device for conduction after termination of operation of said first triggering means; means responsive to operation of said second triggering means for initiating conduction through said conductive device during operation of said second triggering means and for maintaining conduction through said conductive device until a subsequent operation of said first triggering means.
Claim 2
Dependent Claim
188 words
A logic control circuit for energizing and deenergizing a selected device via a given voltage source, said logic control circuit comprising: a conductive device; circuit means operatively associated with said conductive device and adapted to couple said selected device to said voltage source in response to conduction through said conductive device and to uncouple said selected device from said voltage source upon termination of conduction through said conduction device; first and second sequentially operable triggering means having a sequence of operations that after termination of said first triggering means said second triggering means operates and terminates and then operates and terminates again and then said first triggering means operates; means responsive to operation of said first triggering means for rendering said conductive device nonconductive during operation of said first triggering means and for conditioning said conductive device for conduction after termination of operation of said first triggering means; means responsive to operation of said second triggering means for initiating conduction through said conductive device during operation of said second triggering means and for maintaining conduction through said conductive device until a subsequent operation of said first triggering means.
Claim 3
Dependent Claim
72 words
A logic control circuit as set forth in claim 1 wherein said conductive device is a silicon controlled rectifier, wherein the means responsive to operation of said first triggering means controls the path of conduction through said silicon controlled rectifier and wherein the means responsive to operation of said second triggering means applies a conduction-initiating gate pulse to the gate of said silicon controlled rectifier during operation of said second triggering means.
Claim 4
Dependent Claim
34 words
A logic control circuit as set forth in claim 2 wherein said first and second triggering means each comprise a switch which is closed during operation thereof and open upon termination of operation thereof.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |