GB276741A - Improvements in or relating to adjustment devices particularly suitable for use with variable condensers, variometers and the like instruments - Google Patents

Abstract

276,741. Davis, W. J. June 2, 1926. Wireless tuning- apparatus, adjustment and indicating devices for. - A coarse and fine adjustment mechanism comprises epicyclic friction or toothed gearing having the intermediate wheels carried in a rotatable cage rigidly fixed to the operating- spindle, one of the gears being prevented from rotating during the fine adjustment, the arrangement being such that during the coarse adjustment there is no relative rotation between the gear wheels which rotate as a whole. In one construction, Fig. 1 (Provisional Specification), the intermediate wheels H, J are carried between plates D, E rigidly secured to the spindle A by a grub screw G. The fine adjustment spindle M is integral with a pinion L which is pressed into contact with the wheels H by springs K, the wheels J being simultaneously pressed into contact with the rim of a dished washer C. The washer C is loosely mounted on the spindle A and has a felt or other liner in its under side which frictionally engages the panel B. In modifications, the springs K engage with the pinion L only, pressure being transmitted through the gear wheels to the panel. The grub screw G is also arranged to project to the exterior of the coarse adjustment knob.