Occasionally I get a bee in my bonnet about a certain mechanism.
Today's case in point: I wanted the cogwheel driven robot to have a pair of long flexible feelers that it swung before itself, feeling for obstacles. In other words, I want a trigger that rotates through ~180 degrees and is only triggered if the feeler fetchs up against an obstacle.
The trick seems to be to rotate the entire pawl and ratchet assembly, and take the activation motion off the spindle by pushing upwards.
A picture will be worth a thousand words, if I can get the scanner running.
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