公开(公告)号：US3676824A

公开(公告)日：1972-07-11

申请号：US3676824D

申请日：1970-09-18

Applicant: VISHAY INTERTECHNOLOGY INC

Inventor： MULQUEEN JOHN J ,  SCHOETTLY EDWARD

IPC: H01C10/14 ,  H01C9/02

CPC classification number: H01C10/14 ,  Y10S338/01

Abstract: A trimming potentiometer comprising a base with a flange extending perpendicular to it and a cover that encloses the flange and is sealed to the base. Supported on the flange is an assembly comprising a post, a non-conductive plate on which an arcuate resistive path is disposed, a contact plate with a contact finger that presses against the resistive element, and a gear journaled on the shaft and releasably coupled to the plate to move the finger along the arcuate resistive path. The shaft, the plate and finger, and the gear are joined together, and a spring is provided to force the plate into engagement with the gear. The cover has a lead screw mounted in it with a head available to the outside and the threaded portion in mesh with the gear. The axial direction of the screw may be either perpendicular to the base or parallel with it.

Abstract translation: 一种微调电位计，包括具有与其垂直延伸的凸缘的基座和封闭凸缘并且密封到基座的盖。 在法兰上支撑的是一种组件，其包括柱，其上布置弧形电阻路径的非导电板，具有压接电阻元件的接触指的接触板，以及轴承在轴上的可释放地联接到 板沿着弓形电阻路径移动手指。 轴，板和指状物和齿轮连接在一起，并且提供弹簧以迫使板与齿轮接合。 盖具有安装在其中的导螺杆，其中可用于外部的头部和与齿轮啮合的螺纹部分。 螺杆的轴向可以垂直于底座或与其平行。

公开(公告)号：US3626351A

公开(公告)日：1971-12-07

申请号：US3626351D

申请日：1970-09-18

Applicant: VISHAY INTERTECHNOLOGY INC

Inventor： SCHOETTLY EDWARD

IPC: H01C10/14 ,  H01C9/02

CPC classification number: H01C10/14 ,  Y10S338/01

Abstract: A trimming potentiometer including a housing having top and bottom sections. The bottom section houses a gear which has on one of its flat surfaces a laterally disposed cam for engagement with a matching cam on one surface of a contact drum which also fits within the housing. The drum has on its reverse surface an electrical contact pressed against an arcuate-shaped resistance element housed within the top section and having each of its ends connected to a conductive terminal. The gear is driven by a worm rotatably mounted in the bottom section. Rotation of the worm drives the gear, which rotates the drum, causing the electrical contact to sweep across the arcuate-shaped resistance element. The drum has a stop that engages abutment edges on the housing to limit rotation of the drum so that the electrical contact will not go beyond the arcuate limit of the resistance element, usually 270* or so. If rotation of the screw is continued after the stop engages the abutment edges at either end of the range of rotation, the gear and screw are forced out of engagement with each other by camming action between the cam on the gear and the matching cam on the drum to prevent destruction of either the gear section or the thread surface of the worm. Within the bottom section is positioned a gear spring which will flex when the gear is forced out of position against it, but will keep the gear otherwise engaged with the screw. The drum is generally circular in shape and large enough to have one of its sides ordinarily pressed against a shoulder at the bottom section. Since the drum will rotate with the gear, unless otherwise provided, the drum will encounter large frictional forces when turning against the shoulder of the section. To reduce friction a wave spring is provided between the drum and the section shoulder.