| 摘要 |
<p>SNAP ACTING SWITCH FOR THERMOSTATS OR THE LIKE A snap acting switch structure for thermostats or the like is disclosed in which the switch's movable contact is supported on a pair of arms the first of which is placed in compression and the second of which is placed in tension by a bistable spring system. The first arm is formed of relatively thin metal providing deep flanges to cause the arm to act as a rigid beam pivoted at one end. The two arms are welded together in face-to-face adjacency and the actuating force applied to the switch is applied substantially at the joint between the arms. Therefore, there are no substantial bending forces applied to the first arm, and the switch efficiently produces good wiping between the contacts and sufficient shear forces to break welds which may occur therebetween. The operating temperature differential is established for a given contact gap value by selecting the position of a calibration screw along the length of one leg of the snap spring system so that it cooperates with the stiffness of such leg to control the position of the joint between the snap spring legs to cause proper temperature differential.</p> |
