Safety switch operated by key-actuated rotary cam - has keyhole entrance guarded by angled faces of two plungers biased by springs upward and downward

摘要

The key (11) is slid into a channel (9) to cooperate with the cam (25). A pin (13b) projecting downward from the key enters a recess in the cam (25) so as to rotate it in either direction, releasing a spring-loaded plunger (6,10) so that moving the fixed contacts (12,5) come together. The entrance is closed by two spring-loaded plungers (18a,18b) working in opposite directions with inclined faces (22a,22b) pushed aside by the sloping edges (21a,21b) of the key (11). USE/ADVANTAGE - On doors of switchgear cubicles etc. System of simple devices improves both security and reliability of operation.