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:
Nov. 21, 1978
Filed:
Sep. 06, 1977
Bernt O Hormann, Sindelfingen, DE;
Egon Frey, Sindelfingen, DE;
Abstract
An antenna adapted to be extended and retracted for car radio receivers, which is actuated by means of an on-off switch of the radio receiver and is driven by an electric motor reversible in its direction of rotation; the control circuit for the electric motor includes two limit switch contacts adapted to be opened by switching cams on a disk that moves proportional to the movement of the antenna, and a further switching contact which is adapted to be actuated by a further switching cam of the disk; the further switching contact is thereby opened at and above a predetermined extended length of the antenna while a manual switch with push-button function and possibly with detent function is provided for the further selective extension or retraction of the antenna.