Variable resistor

• US 4,785,278 A
• Filed: 09/29/1987
• Issued: 11/15/1988
• Est. Priority Date: 10/01/1986
• Status: Expired

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Ueda, Yukinori, Nishizawa, Hideo
• Primary Examiner(s): ALBRITTON, CLARENCE
• Application Number:
  US07/102,321
• Time in Patent Office: 413 Days
• Field of Search: 338/160, 338/162, 338/163, 338/164, 338/184, 338/199, 338/167, 338/171, 338/190, 338/174, 338/188
• US Class Current: 338/162
• CPC Class Codes: H01C 10/005 Surface mountable, e.g. chip trimmer potentiometer

Abstract

A variable resistor wherein the arm portion of a rotatable slider is in contact against an approximately circular arc-shaped resistor provided on a base plate with the central portion of the resistor, and the slider is provided with a driver plate having an approximately dish-shaped projection portion at its center, and an approximately ring-shaped arm portion having a contact portion, which are coupled to each other, are punched out from one sheet of conductive sheet metal, are turned up by 180° at the coupling portion, with the projection portion being projected from the arm portion.

Claims

1. A variable resistor comprising a base plate having a hole at its center and a resistor around the hole, a slider provided with, at its one end, a driver plate having an approximately dish-shaped projection at its center, and an approximately ring-shaped arm portion having a contact point portion, which are coupled to each other at a coupling portion of the both ends, are punched out from one piece of conductive sheet metal and are turned up by 180°

at the coupling portion with the projection portion being projected from an arm portion, and a terminal plate having a cylindrical portion inserted through the hole of the base plate and engaged into the hole of the projection portion of the driver plate, the driver plate being rotatably mounted onto the base plate through the terminal plate.

2. The variable resistor as claimed in claim 1, wherein the driver plate is positioned extendingly to the outside of the arm portion in order to protect the arm portion.

3. The variable resistor as claimed in claim 1, wherein the driver plate is provided with a groove to use for a plus driver.

4. The variable resistor as claimed in claim 1, wherein the driver plate is provided with a groove to use for a minus driver.