| 摘要 |
A pushbutton switch comprises a plunger, which provokes, under the action of pressure by a user, the depression of an upper dome positioned above switching means, any depression of the upper dome necessarily provoking the depression of the switching means, the crest of the upper dome and the switching means having a down position, a first electric contact being produced between a primary contact and a secondary contact of the upper dome forming a first electric circuit when the crest of the upper dome is in the down position, and a second electric contact being produced between a primary contact and a secondary contact of the switching means forming a second electric circuit when the switching means are in the down position. |
