Rotary adjustable electronic component - has step reduced diameter spindle for adjustment control and to accommodate miniature component

摘要

The constructional elements of a rotary adjustable electronic component, e.g. a resistor, are suitable for small dimensional installations and avoid problems such as irregular adjustment characteristics when small diameter adjustment spindles etc. are used. The design uses a narrowed spindle to enable front facia apertures to be covered whilst providing a larger adjustment spindle attached to a small dimension component. A threaded bush (11) is used to bolt (nut 19) the component to the equipment chassis (14). An operating spindle (12) passes through the bush (11) and has a rear wiper plate (13) to carry the wipers (20) which connect with the resistive substrate (23) track fixed to the rear of the support bush (11). The centre spindle (12) reduces in diameter three times from adjustment knot end through the bush (11) and again to accommodate the wiper support (12',13) to enable a small component to be reliably adjusted. The component may also be a variable capacitor or inductor.