US3946284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for controlling damp shock loading
Assignee: Oak Industries Inc
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Filing: 1974-08-19
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Granted: 1976-03-23
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Expires: 1994-08-19
Abstract
Abstract This is concerned with an electric circuit for controlling or damping the shock loading on the structural components and parts of machinery which are moved by a conventional hydraulic cylinder. It is more specifically concerned with a control circuit to be used with a proportional control valve so that the mass moved by the cylinder will be gradually accelerated and decelerated to avoid abrupt starts and stops.
Inventors
- 👤 Andrew M. Dieringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:47
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/22; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
128 words
A circuit for use with a hydraulic cylinder for moving a load, a proportional control valve with a coil adapted to control the flow of hydraulic fluid between a fluid source and the cylinder, a power circuit connected to the coil for providing current from a power source through the coil to ground, a transistor in the circuit on each side of the coil, a control circuit connected to the transistors for applying an input to the base of each of the transistors, and an RC circuit in the control circuit to load and unload during the signal to increase and decrease the bias on the base of the transistor so that current flow to the valve will gradually increase when applied and gradually decrease when cut off.
Claim 2
Dependent Claim
128 words
A circuit for use with a hydraulic cylinder for moving a load, a proportional control valve with a coil adapted to control the flow of hydraulic fluid between a fluid source and the cylinder, a power circuit connected to the coil for providing current from a power source through the coil to ground, a transistor in the circuit on each side of the coil, a control circuit connected to the transistors for applying an input to the base of each of the transistors, and an RC circuit in the control circuit to load and unload during the signal to increase and decrease the bias on the base of the transistor so that current flow to the valve will gradually increase when applied and gradually decrease when cut off.
Claim 3
Dependent Claim
29 words
The structure of claim 1 further characterized by and including duplicate power and control circuits connected oppositely to the coil to operate the valve and cylinder in opposite directions.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |