| 摘要 |
<p>In a temperature responsive safety switch including an insulating housing provided with a recess, a thermally conductive heat transfer plate mounted on the housing, a pair of electrically conductive contact elements mounted in the housing and defining an electric current path extending through the housing, one of the contact elements being a spring element which is internally stressed to tend to separate from the other contact element, a body of meltable material mounted on the heat transfer plate, and a forcetransmitting plunger displaceably mounted in the housing and supported between the body of meltable material and the spring element to maintain the contact elements in contact with one another when the body of meltable material has not melted, there is provided a hollow cylindrical sleeve member mounted in the housing recess and in which the solder body is enclosed and which is oriented in the displacement direction of the plunger, the sleeve member and plunger being so positioned and dimensioned relative to one another that the end of the plunger remote from the contact spring extends into the sleeve member with play in the direction perpendicular to the longitudinal axis of said sleeve member, the housing recess being dimensioned to present a space around the sleeve member sufficient to receive the entire mass of solder when the solder melts and is forced out of the sleeve member by displacement of the plunger.</p> |
