Lowerable antenna for radio receivers

US4126820A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Bernt O. Hormann · Sindelfingen, DE
• Egon Frey · Sindelfingen, DE

Key dates

• Filing date: Sep 6, 1977
• Grant date: Nov 21, 1978
• Expiry date: Sep 6, 1997

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q9/14
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

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.