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:
May. 29, 1984
Filed:
Sep. 08, 1981
Satoshi Yasumura, Tokyo, JP;
Trio Kabushiki Kaisha, Tokyo, JP;
Abstract
A volume control apparatus for use in an acoustic apparatus with a sound signal source and an amplifier which is usable as an alarm or warning apparatus. The volume control apparatus is provided with a motor for operating a volume control variable resistor, a manually operatable presetting variable resistor and first, second and third selectively operable manual switching means. Upon each power supply, the volume control variable resistor is always automatically set by the motor to a position corresponding to a preset position of the presetting variable resistor regardless of its position prior to the power supply. By selectively operating the first and second switching means at a desired moment after the power supply, the volume control variable resistor is set by the motor from the position corresponding to the preset position of the presetting variable resistor to a desired position regardless of its previous position. By operating the third switching means at a desired moment after the power supply, the presetting variable resistor can be adjusted while listening to a sound produced by a speaker.