| 摘要 |
FIELD: production of computers, control-cash machines and other means and equipment for accounting, planning and analysis of operations, that require protection against action of environment (dust, moisture). SUBSTANCE: keyboard has printed-wiring plate mounted on base, lid with windows and key mechanisms, components of which are keys, pushers with contacts and membranes, that are mounted in wells and capable for longitudinal motion. Wells are made in the form of cylindrical bulges on outer and inner sides of lid. Membrane is made in the form of dome and in the form in its middle part and in the form of hollow cylinders in its top and base. Membrane is mounted with its base on outer collar of well and with its top - on head of pusher and provides improved protection of keyboard from action of environment. To limit longitudinal motion of executing members each well has stop. To prevent free drop out of key mechanisms pusher base has lugs. Axial hole of stop is made in steps and. EFFECT: increased protection of keyboard from action of environment. 7 dwg |
