Mechanically operated electric pulse switch and anti-tie down control circuit using the same

In an anti-tie down control circuit for energizing electrical apparatus for a single operational cycle of said apparatus each time said control circuit is operated, a pair of mechanically operated pulse switches having their respective contacts connected in series in said control circuit, each said switch having a pushbutton operator providing closure and reopening of the respective switch contacts upon a single depression of a respective said pushbutton operator, said closure having a duration which is independent of operation of said pushbutton operator, said switches requiring substantially simultaneous depression of said pushbutton operators for operation of said control circuit, said switches each comprising:

• a stationary contact;
• movable contact means biased away from said stationary contact;
• a contact actuator movable between two stable positions thereof in response to depression of said pushbutton operator, subsequent depressions of said pushbutton operator effecting movement of said actuator in alternate directions;
• and
• means on said actuator engaging said movable contact means for effecting momentary closure of said movable contact means upon said stationary contact during movement of said actuator from one stable position to the other.

A mechanically operated electric pulse switch comprising, in combination:

• a pushbutton operator;
• a stationary contact;
• a movable contact biased away from said stationary contact;
• a contact actuator movable between two stable extreme positions thereof in response to depression of said pushbutton operator, subsequent depressions of said pushbutton operator effecting movement of said actuator in alternate directions;
• means on said actuator engaging said movable contact for effecting momentary closure of said movable contact upon said stationary contact and reopening of said movable and stationary contacts during movement of said actuator from one stable position to the other, closure and reopening of said movable and stationary contacts occurring during a single depression movement of said pushbutton operator.