EXPLOSION-PROOF KEY SWITCH.

摘要

An explosion-proof key switch has a switch seat (2) and a cover plate (6), wherein the inside of the switch seat is provided with a switch lock core (1) and a rotating shaft (7) which are connected with each other; the output end of the rotating shaft passes through the cover plate and extends into the outer part of the switch seat; and the cover plate is provided with a microswitch (9) matched with the output end of the rotating shaft. The input end of the rotating shaft is arranged on the switch seat through a copper jacket (5) sleeved outside; clearances between the copper jacket and the rotating shaft and between the copper jacket and the switch seat are less than 0.2mm, and the lengths of the clearances are more than 12.5mm; the end face of the output end of the rotating shaft is provided with a notch (14); and one side of the power end of an elastic rod (16) arranged on the microswitch is provided with an idler wheel (15) contacted with the longitudinal section of the notch, while the other side is contacted with a movable contact (17).