| 摘要 |
In a snap-action electric switch, and a contact blade structure therefor, the contact blade of the contact blade structure is constituted by an actuation portion of approximately hollow rectangular form having two spaced limbs, a web at one end of the contact blade, and a further web at the other end of the contact blade, and a biassing portion which is disposed within the actuation portion and which is integral therewith by being connected to the first-metioned web of the actuation portion. A contact member is disposed between adjacent edge portions of the above-mentioned further web of the actuation portion and of the biassing portion, the biassing portion being of resultant cyma form to urge the contact member towards electrical contact with a terminal of the switch when the contact blade structure is operatively in use. An actuator member incorporated in the switch is operatively engageable with the limbs of the actuation portion of the contact blade for movement of the contact member into engagement with a second terminal of the switch, a slightly resiliently deformable cylindrical roller being disposed at the base of an inclined surface which is presented by the switch and which extends towards the above-mentioned one end of the contact blade, with the biassing portion of the contact blade at the junction between the double curves thereof in contact with the roller. Thus, the electric switch, and the contact blade structure therefor, are of simplified form, and substantially overcome the disadvantages which arise if the contact blade is constituted by two or more elements, if the contact blade incorporates bend lines, or if the contact member requires to be riveted to the contact blade.
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