US3692260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damping devices
Assignee: HM Hobson Ltd
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Filing: 1970-05-28
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Granted: 1972-09-19
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Expires: 1990-05-28
Abstract
Abstract A hydraulic jack for actuating the flying control surface of an aircraft which includes a damper mechanically connected to the piston and cylinder assembly of the jack and effective to augment the stability of the installation.
Inventors
- 👤 Stanley George Glaze
- 👤 Charles Philip Smith
- 👤 Jerzy Leon Courtenay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
B; B64; B64C; B64C13/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A hydraulic jack for actuating a flying control surface of an air craft which comprises a cylinder and cooperating main piston, one for attachment to the aircraft structure and the other for attachment to the control surface, a control valve external to the cylinder and movable in opposite directions from a neutral position to connect opposite ends of the cylinder alternatively to a pressure inlet and to an exhaust outlet and thereby to effect relative movement between the cylinder and the main piston, a smaller piston attached to the cylinder and extending into a bore in the piston rod of the main piston, a damping orifice in one of the main piston and the smaller piston for controlling the flow of liquid between said bore and the exhaust outlet, and a non-return valve in the said one of the main piston and the smaller piston adapted to open to provide a bypass flow from the bore to the exhaust outlet.
Claim 2
Dependent Claim
160 words
A hydraulic jack for actuating a flying control surface of an air craft which comprises a cylinder and cooperating main piston, one for attachment to the aircraft structure and the other for attachment to the control surface, a control valve external to the cylinder and movable in opposite directions from a neutral position to connect opposite ends of the cylinder alternatively to a pressure inlet and to an exhaust outlet and thereby to effect relative movement between the cylinder and the main piston, a smaller piston attached to the cylinder and extending into a bore in the piston rod of the main piston, a damping orifice in one of the main piston and the smaller piston for controlling the flow of liquid between said bore and the exhaust outlet, and a non-return valve in the said one of the main piston and the smaller piston adapted to open to provide a bypass flow from the bore to the exhaust outlet.
Claim 3
Dependent Claim
17 words
A hydraulic jack as claimed in claim 1, wherein said non-return valve is in the smaller piston.
Claim 4
Dependent Claim
17 words
A hydraulic jack as claimed in claim 1, wherein said non-return valve is in the main piston.
Claim 5
Dependent Claim
33 words
A hydraulic jack as claimed in claim 1, which includes exhaust outlet valves between opposite ends of the cylinder and the exhaust outlet which permit of fluid being drawn from exhaust without cavitation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |