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:
Mar. 21, 2000
Filed:
Feb. 25, 1999
Fumitoshi Masuda, Fukui-ken, JP;
Masashi Morikami, Fukui-ken, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Abstract
Slack in the engagement of a shaft 5 and a rotor 3 in a case 1 is prevented by the resiliency of an O ring 6 under radial but not axial compression. Even if heat stress is added, the variable resistor which can secure air-tightness is provided. The rotor 3 and a slider 4 are accommodated in the case 1. A resistance substrate 2 having a collector electrode 25 formed on the central portion of the surface and a circular resistor 24 formed concentrically on the periphery of the collector electrode 25 is engaged with the lower end part of the case 1. A stepped surface 12 supporting the peripheral surface and the bottom surface of the O ring 6 is formed on the upper surface of the case. A boss portion 55 contacting the inner circumference of the O ring 6 and an operating portion 51 projecting on the upper surface of the case 1 and covering the stepped surface 12 is formed on the shaft 5. The inner and outer circumferences of the O ring 6 are pressed and contacted with the stepped surface 12 of the case and the boss portion 55 of the shaft 5. A gap .delta. is provided between either upper or lower end surface of the O ring 6 and the stepped surface 12 or the bottom surface of the operating portion 51.