US3893377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic servomotor
Assignee: US Philips Corp
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Filing: 1973-10-09
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Granted: 1975-07-08
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Expires: 1993-10-09
Abstract
Abstract A hydraulic servomotor comprising one or two controlled motor spaces. An accumulator is connected to each of the motor spaces, a flexible diaphragm in each accumulator dividing the accumulator space into a compartment which the hydraulic medium can flow into or out of via a restriction, and a compartment in which a gas under pressure is contained.
Inventors
- 👤 Jacob Johan T Mannetje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:45
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/22; F15B1/00; F15B1/02; F15B15/08; F15B15/14; F15B15/1423; F15B15/1433; F15B15/149; F15B21/00; F15B21/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A hydraulic servomotor comprising a controlled motor space, means for conducting hydraulic medium to said space, and means for damping oscillations of pressure of the hydraulic medium, said damping means comprising an accumulator having first and second compartments separated by a flexible diaphragm, said accumulator comprising a disk member and a block member, said disk member being a wall of said first compartment, and a viscous flow restriction means for connecting said first compartment directly to said motor spaces, said viscous flow restriction means being at least one restrictive passage through said disk member, said second compartment containing a gas under pressure.
Claim 2
Dependent Claim
102 words
A hydraulic servomotor comprising a controlled motor space, means for conducting hydraulic medium to said space, and means for damping oscillations of pressure of the hydraulic medium, said damping means comprising an accumulator having first and second compartments separated by a flexible diaphragm, said accumulator comprising a disk member and a block member, said disk member being a wall of said first compartment, and a viscous flow restriction means for connecting said first compartment directly to said motor spaces, said viscous flow restriction means being at least one restrictive passage through said disk member, said second compartment containing a gas under pressure.
Claim 3
Dependent Claim
57 words
A hydraulic servomotor as claimed in claim 1, wherein said diaphragm comprises a ring near the circumference of the diaphragm, said accumulator has a recess between the disk member and the block member having a smaller cross sectional area than the cross sectional area of the ring, said ring being clamped in said recess between said members.
Claim 4
Dependent Claim
30 words
A hydraulic servomotor as claimed in claim 1, wherein said diaphragm has a tubular construction enclosing a variable volume, said second compartment being the volume enclosed within the tubular diaphragm.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |