| 摘要 |
A keyswitch includes a hollow base, a cover sealing the open top side of the base, a push-button type actuator guided to move up and down, two spaced-apart electrode elements fixed on the bottom wall of the base, and a coil spring disposed within the base between the electrode elements and the actuator. The base, cover and actuator are made of an insulative material, while the electrode elements and the coil spring are made of a conductive material. The structures of the base, spring, actuator and cover are symmetrical so as to be easily joined together. The spring is shaped in the form of a truncated cone and has turns of different diameters which gradually decrease in size from the bottom to the top thereof. The lowermost turned portion of the spring is insulated from the electrode elements. When the actuator is depressed, one turned upper portion of the spring moves through the lowermost turned portion of the same so as to come into bridging contact with the electrode elements and establish a conductive path between the electrode elements.
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