Input: green carrier, 180 deg. reciprocating.
Output: blue gear, 180 deg. reciprocating.
During 180 deg. rotation of the input, the output turns 180 deg. and then pauses or vice versa.
White gear is stationary.
No teeth sector of the large gear keeps the blue gear immobile during its pause stages.
It can be used for the gate shown at
https://youtu.be/P32pBR-HRa0
when the opening angle is larger than 90 deg.
آی-ویدئو