1. Automatically returning switch comprising: at least two terminals projecting from a switch box for connection to an outside circuit or circuits, a see-saw contact in electrical contact with one of said terminals and adapted to rock within said box so as to make or break electrical contact with the other terminal or terminals, a rocking actuator with driving means secured at the tip thereof for driving said see-saw contact, two return springs exerting a spring action on said actuator, and means provided on said switch box for fixing said return springs theretO, said returning springs each consisting of a hook portion having a curved portion at its bottom and an arm portion with one end turned approximately at a right angle with respect to the plane containing said hook portion, said spring fixing means being a groove provided on the outside surface of the opposite walls of the switch box and having an island within said groove, and said island having a curvature at its lower part conforming to said curved portion of said hook portion of the spring said two return springs being mounted within each of said grooves on said switch box so that the arm portions of said springs can receive said actuator therebetween.

2. An automatically returning switch comprising: at least two terminals projecting from a switch box for connection to an outside circuit, or circuits; a see-saw contact in electrical contact with one of said terminals and adapted to rock within said box so as to make or break electrical contact with the other terminal or terminals; a rocking actuator with driving means secured at the top thereof for driving said see-saw contact; return spring means exerting a return action on said actuator, said means including two arm portions, each on an opposite side of said actuator, and each having a mounting portion extending substantially normal thereto; and spring receiving means on said switch box for receiving said mounting portions, each said spring receiving means including a groove in the outside surface of one of the walls of said switch box and an island within said groove; whereby said mounting portions have predetermined deflection movement in said grooves.

3. An automatically returning switch comprising: at least two terminals projecting from a switch box for connection to an outside circuit, or circuits; a see-saw contact in electrical contact with one of said terminals and adapted to rock within said box so as to make or break electrical contact with the other terminal or terminals; a rocking actuator with driving means secured at the top thereof for driving said see-saw contact; return spring means exerting a return action on said actuator, said means including two arm portions, each on an opposite side of said actuator, and each having a mounting portion extending substantially normal thereto; spring receiving means on said switch box for receiving said mounting portions, each said spring receiving means including a groove in the outside surface of one of the walls of said switch box and an island within said groove; and said return spring means comprising a spring wire with the said mounting portions thereof generally of U-shape and each said groove being of U-shape with legs of predetermined width and a central, curved, lower portion of reduced width; whereby said mounting portions have predetermined deflection movement in the legs of said grooves.

4. An automatically returning switch comprising: at least two terminals projecting from a switch box for connection to an outside circuit, or circuits; a see-saw contact in electrical contact with one of said terminals and adapted to rock within said box to make or break electrical contact with the other terminal or terminals; a rocking actuator with driving means secured at the top thereof for driving said see-saw contact; return spring means exerting a return action on said actuator, said means including two arm portions, each on an opposite side of said actuator, and each having a mounting portion extending substantially normal thereto; spring receiving means on said switch box for receiving said mounting portions, each said spring receiving means including a groove in the outside surface of one of the walls of said switch box and an island within said groove; and said return spring means comprising a single spring wire forming a symmetrical closed loop; whereby said mounting portions have predetermined deflection movement in said grooVes.

5. An automatically returning switch comprising: at least two terminals projecting from a switch box for connection to an outside circuit, or circuits; a see-saw contact in electrical contact with one of said terminals and adapted to rock within said box to make or break electrical contact with the other terminal or terminals; a rocking actuator with driving means secured at the top thereof for driving said see-saw contact; return spring means exerting a return action on said actuator, said means including two arm portions, each on an opposite side of said actuator, and each having a mounting portion extending substantially normal thereto; spring receiving means on said switch box for receiving said mounting portions, each said spring receiving means including a groove in the outside surface of one of the walls of said switch box and an island within said groove; and said return spring means comprises a pair of identical springs each having a hook portion with a curve at its bottom forming said mounting portion and each having said arm portion at its top with one end turned approximately at a right angle with respect to the plane containing said hook portion, each said arm portion being positioned in contact with an opposite side of said actuator of the switch, the said hook portion having a free end in engagement with the island of the groove in which it is received; whereby said mounting portions have predetermined deflection movement in said grooves.