US3665482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tracking antenna with anti-backlash spring in gear train
Assignee: BAE Systems Electronics Ltd
•
Filing: 1971-03-10
•
Granted: 1972-05-23
•
Expires: 1991-03-10
Abstract
Abstract A steerable aerial, driven via a differential and two reduction gearboxes, on which backlash is eliminated by a spring biassing arrangement. The spring biassing arrangement is connected between the cage member of the differential and one of the planet gears of the differential and provides a constant torque spring bias to one of the reduction gearboxes in relation to that of the other.
Inventors
- 👤 Richard Cresswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:05
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/02; H01Q3/08; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19623; Y10T74/19628
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A steerable aerial installation including a driven gear from which the aerial is carried; a pair of driving gears engaging said driven gear to drive the same; a pair of high reduction ratio gearboxes each in the drive to one or other of said driving gears; a differential having driving means driven by a source of driving power and a pair of differentially related driven means each driving one or other of said gearboxes, and spring bias means arranged to provide substantially constant bias of the drive to one gearbox with relation to that of the other.
Claim 2
Dependent Claim
97 words
A steerable aerial installation including a driven gear from which the aerial is carried; a pair of driving gears engaging said driven gear to drive the same; a pair of high reduction ratio gearboxes each in the drive to one or other of said driving gears; a differential having driving means driven by a source of driving power and a pair of differentially related driven means each driving one or other of said gearboxes, and spring bias means arranged to provide substantially constant bias of the drive to one gearbox with relation to that of the other.
Claim 3
Dependent Claim
33 words
An installation as claimed in claim 1 wherein the differential is of the sun and planet gear wheel type and provides the drives to the gearboxes from the shafts of its sun wheels.
Claim 4
Dependent Claim
34 words
An installation as claimed in claim 2 wherein the spring bias means is a spring operatively connected between the cage member of the differential and one of the planet gear wheels of the differential.
Claim 5
Dependent Claim
78 words
An installation as claimed in claim 3 wherein said aerial is carried from said driven gear by means of a carrier member which is carried by and rotates with said driven gear on the axis thereof, said aerial being pivotted to said carrier member about a pivotal axis perpendicular to the axis of said driven gear and means being provided for adjusting the angular position of said aerial with respect to said carrier member about said pivotal axis.
Claim 6
Dependent Claim
24 words
A satellite tracking aerial installation in accordance with claim 4 wherein the axis of rotation of said driven gear is the hour angle axis.
References Cited (Backward Citations)
US3396594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |