CONTACT GEAR Russian patent published in 1994 - IPC

FIELD: automatics, computer engineering, electronics, radio and instrumentation engineering. SUBSTANCE: contact gear includes printed circuit board 5 with contact lands 6, frame 1 where contact element 4 made from twisted spring of spiral shape is located, key head 2 with guide 3. Spiral expands gradually towards lower part placed above contact lands. Upper part of spring is fitted on guide of key head and is produced in the form of cylinder. With pressure on key head effort is transmitted via guide of contact part of spring and contacts close smoothly. EFFECT: facilitated manufacture, ensured efficiency. 2 dwg