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Rotary Potentiometer Mounting Clamp

IP.com Disclosure Number: IPCOM000046586D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Gregory, JA: AUTHOR

Abstract

The use of a one-piece rotary potentiometer mounting clamp eliminates offset loads when securing a rotary potentiometer in position. These potentiometers require their shaft to be along a given center line perpendicular to the hole surface. Conventionally, a rotary potentiometer 1 is mounted with two separate cleats 2 that are 180 degrees apart, as shown in Fig. 1. An unequal clamping force occurs when one side is clamped too tightly before clamping the opposite side. This, in turn, causes the potentiometer shaft 3 to skew, as indicated by the angle in Fig. 1, resulting in excessive internal wear on the potentiometer, inaccurate potentiometer feedback, and external damage to the transducer. Potentiometers made of a brittle or plastic material are susceptible to fracture under these conditions.

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Rotary Potentiometer Mounting Clamp

The use of a one-piece rotary potentiometer mounting clamp eliminates offset loads when securing a rotary potentiometer in position. These potentiometers require their shaft to be along a given center line perpendicular to the hole surface. Conventionally, a rotary potentiometer 1 is mounted with two separate cleats 2 that are 180 degrees apart, as shown in Fig. 1. An unequal clamping force occurs when one side is clamped too tightly before clamping the opposite side. This, in turn, causes the potentiometer shaft 3 to skew, as indicated by the angle in Fig. 1, resulting in excessive internal wear on the potentiometer, inaccurate potentiometer feedback, and external damage to the transducer. Potentiometers made of a brittle or plastic material are susceptible to fracture under these conditions. This conventional mounting method would require a torque specification for the mounting screws 5 as well as a procedure. A new style of clamp (Fig. 2) provides equal clamping force, via a single screw 10 (Fig.
3) simultaneously to opposite sides (180 degrees apart) of the potentiometer. The potentiometer shaft 6 remains perpendicular to the mounting surface 7, as shown in Fig. 3, and prevents side loading due to misalignment of the potentiometer shaft inside the rotary actuator shaft 8. Only two points of contact 9 (Fig. 4) exist where force is applied to the transducer by the clamp. Thus, adverse wear on the potentiometer and inaccurate...