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. 01, 1991
Filed:
Nov. 03, 1989
Fumitoshi Masuda, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A variable resistor having an insulating substate provided on the surface thereof with a resistor is molded into a resin case, a part of which is heated and bent to rotatably secure a rotor having a sliding member within the case for rotation with respect to the insulating substrate. The insulating substrate is molded into the resin case to make inside of the case airtight. An annular elastic body mounted between the under surface of a skirt portion of the rotor and the insulating substrate makes the space between the rotor and the insulating substrate airtight, and, at the same time, sets the rotational torque of the rotor to a suitable value. The arrangement of the insulating substrate, the resin case and the rotor having the sliding member, reduces the number of parts used for assembling the variable resistor, and together with the use of continuous strip hoop materials for forming terminals and the sliding member, allows for continuous automated production of the variable resistors.