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US 3,944,774 AGranted
Electric switch having a sealed casing
AssigneesToyota Jidosha Kogyo Kabushiki Kaisha, Kabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsMotoi Noba, Hatsuyoshi Yoshida
Life of this patent
Estimating the term…
Abstract
An electric switch having a sealed casing or a closed type switch wherein a breather hose has its one end opened to the interior of a closed contact chamber, so that the breathing action of the contact chamber due to its temperature change is made through the breather hose. An opening at the other end of the breathing hose is located in an outside atmosphere of good condition, whereby air of high humidity is prevented from intruding into the contact chamber.
Claims8
An electric switch which comprises:
- a movable contact and fixed contacts;
- a casing for enclosing said contacts;
- said casing defining a chamber in which said movable contact is disposed, and including a cover to render the same waterproof, the outside wall of said cover defining a cavity having apertures therein through which said fixed contacts are installed with their contact surfaces extending into said chamber;
- a plurality of lead wires disposed in said cavity of said cover and connected to said fixed contacts;
- a compound packed in said cavity to ensure the sealed state of said chamber;
- and means to conduct atmospheric air into and from said casing from a region remote from said casing.
3 more elements
Dependencies are inferred from the claim text.