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US4714930A Expired / Lapsed US ⏱️ 0.0 years remaining

Antenna feed polarizer

Assignee: The General Electric Company PLC
•
Filing: 1986-08-28
•
Granted: 1987-12-22
•
Expires: 2006-08-28
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Abstract

Abstract This invention relates to rotatable antenna feed polarizers for use in communication antenna systems, and seeks to provide, at economic cost, an antenna feed polarizer which is capable of being rotated accurately. The polarizer is rotated by a threaded member rotated by a motor. A drive member is moved longitudinally by the rotation of the threaded member. Two flexible connectors are each attached at one end to the drive member, pass around idler wheels, are wrapped partly around the polarizer, and are fixed to the latter. Movement of the drive member pulls one of the flexible connectors and thereby rotates the polarizer. Backlash is minimal because it occurs between only two moving parts, the drive member and the elongate member, and is achieved without using gears with minimum backlash, which may be expensive.

Inventors

  • 👤 Trevor Winter
  • 👤 William Macey

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:08
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/165

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 101 words
A rotatable antenna feed polariser comprising a motor (6), an elongate threaded member (7) connected to be rotated about its longitudinal axis (8) by said motor (6), a drive member (9) which co-operates with the thread of said elongate member (7) so as to be driven in the direction of said axis (8) when said elongate member (7) rotates, and a flexible connector (11,12) attached to said drive member (9) and wrapped at least partly around said polariser (3) or around an element (1) connected to said polariser (3) whereby said polariser is caused to rotate when the motor (6) operates.
Claim 2
Dependent Claim 101 words
A rotatable antenna feed polariser comprising a motor (6), an elongate threaded member (7) connected to be rotated about its longitudinal axis (8) by said motor (6), a drive member (9) which co-operates with the thread of said elongate member (7) so as to be driven in the direction of said axis (8) when said elongate member (7) rotates, and a flexible connector (11,12) attached to said drive member (9) and wrapped at least partly around said polariser (3) or around an element (1) connected to said polariser (3) whereby said polariser is caused to rotate when the motor (6) operates.
Claim 3
Dependent Claim 44 words
A rotatable polariser according to claim 1 wherein there are two flexible connectors (11,12) attached to the drive member (9), and wrapped in opposite senses to each other at least partly around the polariser (3) or the element (1) connected to the polariser (3).
Claim 4
Dependent Claim 18 words
A rotatable polariser according to claim 1 comprising means (9A) to prevent the drive member (9) from rotating.
Claim 5
Dependent Claim 17 words
A rotatable polariser according to claim 1 wherein the flexible connector (11,12) passes around tensioning means (13,14).
Claim 6
Dependent Claim 18 words
A rotatable polariser according to claim 2 comprising means (9A) to prevent the drive member (9) from rotating.
Claim 7
Dependent Claim 17 words
A rotatable polariser according to claim 2 wherein each flexible connector (11,12) passes around tensioning means (13,14).

References Cited (Backward Citations)

US3089137A Cited
US3357021A Cited
US3394375A Cited
US3604009A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-12-21 1991-06-22 1991-12-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-12-21 1995-06-22 1995-12-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-12-21 1999-06-22 1999-12-22 $7700.00 Window Closed / Lapsed

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