US3655134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet engines for aircraft
Assignee: HM Hobson Ltd
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Filing: 1970-11-23
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Granted: 1972-04-11
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Expires: 1990-11-23
Abstract
Abstract A thrust reversal system for an aircraft jet engine comprising a pair of thrust reverser buckets movable between a stowed and a deployed position, an air motor operable under pilot''s control for imparting movement to the buckets and mechanism for automatically decelerating the air motor as the buckets approach both the stowed and the deployed positions.
Inventors
- 👤 Leonard Sidney Greenland
- 👤 Charles Philip Smith
- 👤 David Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:10
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/54; F02K1/76
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A thrust reversal system for an aircraft jet engine comprising a pair of thrust reverser buckets movable between a stowed and a deployed position, an air motor operable under pilot''s control for imparting movement to the buckets and mechanism for automatically decelerating the air motor as the buckets approach both the stowed and the deployed positions.
Claim 2
Dependent Claim
56 words
A thrust reversal system for an aircraft jet engine comprising a pair of thrust reverser buckets movable between a stowed and a deployed position, an air motor operable under pilot''s control for imparting movement to the buckets and mechanism for automatically decelerating the air motor as the buckets approach both the stowed and the deployed positions.
Claim 3
Dependent Claim
41 words
A system as claimed in claim 1, in which the air motor includes a snubber valve and which comprises mechanism operated by the motor for imparting closing movement to the snubber valve when the buckets near the end of their travel.
Claim 4
Dependent Claim
45 words
A system as claimed in claim 2, which includes a pneumatic servo motor for operating the snubber valve and vent valves controlled by cams operated by the air motor for venting air from the servo motor near the end of the travel of the buckets.
Claim 5
Dependent Claim
24 words
A system as claimed in claim 2, in which the closing movement is imparted to the snubber valve by feedback from the air motor.
Claim 6
Dependent Claim
34 words
A system as claimed in claim 1, which comprises a brake for the air motor and a pneumatic servo motor arranged to apply the brake when the buckets near the end of their travel.
Claim 7
Dependent Claim
30 words
A system as claimed in claim 5, which includes vent valves operated by the air motor for venting air from the servo motor for the purpose of applying the brake.
Claim 8
Dependent Claim
29 words
A system as claimed in claim 5, which includes a feedback connection from the air motor which is operative on the servo motor to effect application of the brake.
Claim 9
Dependent Claim
57 words
A system as claimed in claim 1, which includes a directional control valve for the air motor, a pneumatic servo motor for actuating said valve and a selector valve operative under pilot''s control to cause said servo motor to move the directional control valve in the direction corresponding to the intended direction of travel of the buckets.
Claim 10
Dependent Claim
21 words
A system as claimed in claim 8, which includes a feedback connection between the air motor and the directional control valve.
Claim 11
Dependent Claim
24 words
A system as claimed in claim 1, which includes two ball servo actuators operatEd by the air motor for imparting movement to the buckets.
Claim 12
Dependent Claim
65 words
A system as claimed in claim 1, which includes a pneumatically operated locking plunger for locking the buckets in the stowed position and a selector valve operable by the pilot to retract the plunger upon selection of movement of the buckets to the deployed position and to urge the plunger towards its locking position on selection of movement of the buckets to the stowed position.
Claim 13
Dependent Claim
71 words
A system as claimed in claim 11, which includes a combined shut-off and pressure regulating valve arranged to open under solenoid control upon selection by the pilot of movement of the buckets to the deployed position and to be retained open pneumatically under control of a pneumatic servo motor controlling the locking plunger until the locking plunger has returned to locking position upon return of the buckets to the stowed position.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |