Collapsible rooftop microwave antenna

Details Collapsible rooftop microwave antenna Collapsible rooftop microwave antenna

H - Electricity

01

Q

351/28, 351/54,

H01Q 1/20 (2006.01) H01Q 1/08 (2006.01) H01Q 1/12 (2006.01) H01Q 19/13 (2006.01)

Patent

CA 1209248

ABSTRACT OF THE DISCLOSURE A parabolic, collapsible rooftop microwave antenna for direct satellite-to-consumer TV transmission pivots in the direction of the aperture axis about a horizontal pivot axis in response to excessive wind forces. The antenna has a cross-head theodolite-type mount adjustable for azimuth and elevation, with a horizontal pivot that provides axial displacement if the axial wind force exceeds a predetermined threshold force. This limits the torque transmitted to the roof on which the antenna is mounted to a reasonably low level. Various torque sensitive horizontal pivots are des- cribed including a torqued pivot bolt, torqued slide bolts disposed in arcuate slots for limit-stop action, shear pins for quick release action, and biased springs for collapse and self-restoration to the initial vertical position in response to transient wind force exceeding a threshold force set by the spring bias.

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