Compact double-contact secured pushbutton switch
AssigneeThales
InventorJean-Louis Bigand
Life of this patent
Estimating the term…
Abstract
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.
Claims13
A pushbutton switch, comprising:
- a plunger, the plunger provoking, under an action of pressure by a user, a depression of an upper dome positioned above switching means, any depression of the upper dome necessarily provoking a depression of the switching means,
- a 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,
- 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 is in the down position;
- and
- an intermediate mobile part positioned below the upper dome and above the switching means, the intermediate mobile part being electrically conductive at least in its upper portion and electrically linked to the secondary contact of the upper dome, the depression of the upper dome resulting in a closure of said first electric circuit, and the depression of the switching means being brought about by the displacement of at least one of the intermediate mobile part, the top surface of the lower dome, and the bottom surface of the intermediate mobile part being electrically insulating.
Dependencies are inferred from the claim text.