| 摘要 |
An adjustable snap-acting thermostatic switch, exhibiting a small temperature differential between its switch-on and switch-off conditions throughout its adjustment range, consists of a snap-acting switch actuator blade (7) which is controlled in its movement by the action of a pair of opposed creep bimetals (19, 20). A spindle (18) carrying a cam (26) engaged with one (19) of the creep bimetals is rotatable for adjusting the temperature setting of the thermostat. The other (20) creep bimetal is coupled to the switch actuator blade (7) by a coupling member (27) which transmits switch actuating movements of the bimetals (19, 20) to projections (13) provided in a cut-out (8) in the switch actuator blade (7) for causing the blade (7) to snap to its opposite condition, and this determines the condition of a pair of switch contacts (14, 6). The actuator blade (7) includes a pair of legs (9) bridged at their ends, one of the bridging portions (11) being crimped (12) to render the blade snap acting. <IMAGE> |
