US3572965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter control means
Assignee: Individual
•
Filing: 1969-04-23
•
Granted: 1971-03-30
•
Expires: 1989-04-23
Abstract
Abstract Torque motors are interposed in the control linkages used for processing the control gyro of a rigid rotor helicopter. Due to the inherent characteristics of a DC torque motor, this arrangement damps unwanted nutations of the control gyro while at the same time allowing accurate control of the processing of the control gyro.
Inventors
- 👤 Harold R Scheibe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:35
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
A helicopter control unit comprising: A rigid helicopter rotor having variable pitch blades thereon; a swash plate; a control gyro connected to said swash plate; means interconnecting said control gyro and said helicopter rotor so that a change in the plane of rotation of either causes a compensating change in the pitch of said blades; two sets of control linkage means for applying torque to said swash plate to precess said control gyro in first and second directions; and a first means connected within one of said linkage means for causing said one of said linkage means to apply a torque to said swash plate while acting to damp control gyro nutations and to absorb back motion through said one of said linkage means caused by the action of the other of said linkage means upon the control gyro.
Claim 2
Dependent Claim
139 words
A helicopter control unit comprising: A rigid helicopter rotor having variable pitch blades thereon; a swash plate; a control gyro connected to said swash plate; means interconnecting said control gyro and said helicopter rotor so that a change in the plane of rotation of either causes a compensating change in the pitch of said blades; two sets of control linkage means for applying torque to said swash plate to precess said control gyro in first and second directions; and a first means connected within one of said linkage means for causing said one of said linkage means to apply a torque to said swash plate while acting to damp control gyro nutations and to absorb back motion through said one of said linkage means caused by the action of the other of said linkage means upon the control gyro.
Claim 3
Dependent Claim
15 words
The control means of claim 1 wherein the first means comprises a DC torque motor.
Claim 4
Dependent Claim
29 words
The control means of claim 2 wherein the first means further comprises a pinion connected to the shaft of the motor and a rack in mesh with the pinion.
Claim 5
Dependent Claim
69 words
The control means of claim 1 further comprising a second means connected within the other of said linkage means for causing said other of said linkage means to apply a torque to said swash plate while acting to damp control gyro nutations and to absorb back motion through said other of said linkage means caused by the action of said one of said linkage means upon the control gyro.
Claim 6
Dependent Claim
15 words
The control means of claim 4 wherein said second means comprises a DC torque motor.
Claim 7
Dependent Claim
17 words
The control means of claim 4 wherein both said first and second means comprise DC torque motors.
Claim 8
Dependent Claim
47 words
The combination of claim 6 wherein both said first and second means further comprise a pinion connected to the shaft of each motor, a rack in mesh with each said pinion and a linkage system for transmitting force imparted to each said rack to said swash plate.
Claim 9
Dependent Claim
16 words
The combination of claim 7 wherein said first direction and said second direction are mutually orthogonal.
References Cited (Backward Citations)
US2396038A
Cited
US2368698A
Cited
US2397183A
Cited
US2439089A
Cited
US2519762A
Cited
US2598672A
Cited
US2992563A
Cited
US3144906A
Cited
US3135335A
Cited
US3256780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |