| 摘要 |
523,993. Snap-action switches and valves. FABRIC ELEKTR. APPARATE F. SAUTER AKT.-GES. Jan. 18, 1939, No. 1812. Convention date, Jan. 19, 1938. [Class 38 (v)] [Also in Group XXIX] A snap - action thermal switch, Fig. 1, comprises a fluid-filled thermal element 24 which acts on a bellows 21 against the action of an adjustable spring 5 to move a rod 25 carrying contacts 17, 18, cooperating with fixed contacts 15. A snap-action is provided by the engagement in grooves 26, 27 of spring-pressed balls 11 carried in a fixed insulating sleeve 28. The operating temperature is varied by altering the spring pressure on balls 11 by moving the counter supports 30 of the springs by means of a conical nut 29 screwed on the member 28. In a valve-actuating device, Fig. 2, the valve 33 is attached to a rod 35 lifted by fluid pressure acting on a bellows 31 against a spring 44. A snap-action is produced by the engagement of spring-seated balls in grooves 36, 37, 38. The fluid pressure may arise from changes of temperature in a cooling system. |
