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:
Oct. 17, 1989
Filed:
Jun. 22, 1988
Jiro Harada, Tokyo, JP;
Harada Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A drive control device for an electrically-driven extending and retracting antenna such as an antenna on an automobile including a motor-driven rotary plate which makes approximately one revolution during the time for complete extension or retraction and has attached, on one side, a disk-shaped conducting part with a small cut-out. Of the three contacts, the first is ordinarily in contact with the disk-shaped conducting part, maintaining a state of electrical continuity, the second contact contacts the small cut-out when extension of the antenna is completed; and the third contact contacts the small cut-out when retraction of the antenna is completed. As a result, electrical continuity is maintained during extension or retraction of the antenna, but not when extension or retraction has been completed. The first and second contacts thus constitute a limit switch for antenna extension; and the first and third contacts constitute a limit switch for antenna retraction. As a result, the extension and retraction operating wire never sustains any unreasonable tensile or compressive forces as would be the case with a step-type drive control, where the drive motor operates for longer periods than required.