US 3,952,984 AGranted

Mid-tower rotary antenna mount

OwnerDracos Alexander Dimitryinventor

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Abstract

Bolted or otherwise secured in offset relationship to one of the legs of a radio or television tower or mast is a bracket to the top of which is fixedly secured an inner sprocket. Rotatably mounted in this bracket coaxial with the inner sprocket is an inner shaft to the top of which is fixedly secured the rearward hub of an inner arm. Rotatably mounted in the forward hub of the inner arm is an intermediate shaft to the lower end of which is fixedly secured a lower intermediate sprocket carrying an endless sprocket chain drivingly connecting it to the inner sprocket. Fixedly secured to the forward hub of the inner arm coaxial with the intermediate shaft above the lower intermediate sprocket is an upper intermediate sprocket. Fixedly secured to the upper end of the intermediate shaft is the rearward hub of an outer arm, in the forward hub at the outer end of which is journaled an outer shaft. Fixedly secured to the outer shaft is an outer sprocket drivingly connected by a sprocket chain to the upper intermediate sprocket. Fixedly connected to the upper end of the outer shaft is an antenna boom which in turn carries a conventional antenna array for radio or television communication. A torque motor is optionally mounted on the bracket and drivingly connected to the inner shaft for power-operation of the rotary antenna mount, or alternatively it may be rotated manually through suitable gearing.

A rotating and swinging antenna-orienting contrivance for mounting upon an upright of an upstanding radio communication antenna supporting structure intermediate its upper and lower ends, said contrivance comprising

- a bracket structure including a pair of substantially horizontal upper and lower bracket members disposed in vertically-spaced substantially parallel relationship and having upper and lower inner ends with attachment means thereon adapted to be attached to the upright of the antenna supporting sturcture in outwardly-projecting offset relationship thereto and having upper and lower outer ends spaced outwardly away from said inner ends,
upper and lower inner bearings mounted on said upper and lower outer ends respectively in vertically-spaced coaxial relationship,
an inner rotary member journalled in said inner bearings,
an inner arm fixedly secured to said inner rotary member and having an intermediate bearing thereon disposed remote from said inner bearing in spaced parallel relationship thereto,
an intermediate rotary member rotatably mounted in said intermediate bearing,
an outer arm fixedly secured to said intermediate rotary member and having an outer bearing thereon disposed remote from said intermediate bearing in spaced parallel relationship thereto,
an outer rotary load-carrying member rotatably mounted in said outer bearing,
an inner driving device drivingly connecting said bracket structure to said intermediate rotary member and constructed and arranged to rotate said intermediate rotary member in response to the swinging of said inner arm by the rotation of said inner rotary member,
an outer driving device drivingly connecting said inner arm to said outer rotary member and constructed and arranged to rotate said outer rotary member in response to the swinging of said outer arm relatively to said inner arm by the rotation of said intermediate rotary member,
and a motor drivingly connected to said inner rotary member for rotating said inner rotary member.

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Abstract

Claims1