A gauge wherein a helical drive member rotates to move a pointer along the perimeter of a dial to indicate a measured value

摘要

A gauge 10 comprises a pointer assembly 16 and dial 12 with peripheral scale 14. The pointer assembly comprises a guide 26 adjacent to the scale supporting a helical drive member 22. The drive member carries a follower 20 and pointer 18. A motor 24 axially rotates the drive member causing the pointer to move relative to the scale to indicate a measured value; clockwise and counterclockwise rotation drives the pointer in opposite directions. The drive member may have a constant or variable pitch such that the linear distance moved by the pointer for each rotation is respectively constant or non-constant. The dial boundary may be straight or curved and a display (e.g. LCD) may be disposed within the dial, no part of which is obscured by the scale or pointer.