The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 1994
Filed:
Oct. 13, 1992
Masaki Shinkawa, Tokyo, JP;
Nobuhiko Suzuki, Tokyo, JP;
Manabu Sakakibara, Hiroshima, JP;
Norifumi Ogawa, Hiroshima, JP;
Harada Industry Co., Ltd., Tokyo, JP;
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.