Apparatus for driving rod antenna element for expansion/contract

Details Apparatus for driving rod antenna element for expansion/contract Apparatus for driving rod antenna element for expansion/contract

1992-10-13

1994-12-06

Jillions, John M.

Winding, tensioning, or guiding

Reeling device

With particular drive

343903, H01Q 110, B65H 7534

Patent

active

053703340

ABSTRACT:
An apparatus for driving a rod antenna element for expansion or contraction according to the invention is characterized in that its rotary drum for winding or unwinding a base portion of a rope for expanding or contracting the antenna element is provided with a means for frictionally transmitting rotary force comprising a plurality of minute ridges and recess formed on the inner peripheral surface of the shaft bearing section in order to frictionally and directly or indirectly transmit in part the rotary force of an electric motor to the rotary drum and that the inner rope-sliding peripheral surface of a rope storage area of the rotary drum is flared from the remotest point thereof toward the rope inlet/outlet port to form a peripheral surface of a frustum of cone.

REFERENCES:
patent: 1384324 (1921-07-01), Kelly
patent: 2496785 (1950-02-01), Finneburgh et al.
patent: 3774675 (1973-11-01), Yoshiro
patent: 4236162 (1980-11-01), Carolus
patent: 4389203 (1983-06-01), Duntzen
patent: 4436250 (1984-03-01), Becker
patent: 4633266 (1986-12-01), Alf et al.
patent: 4665406 (1987-05-01), Takizawa et al.
patent: 4768991 (1988-09-01), Kopp
patent: 4864322 (1989-09-01), Yamamoto et al.

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