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you really need a huge amount of force to release the dog gear
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If you design the spring attachment points so that the spring is almost parallel to the kicking lever when in the armed position, then the holding torque will be very low, even with large kicking energy stored in the spring. Then it is easy to actuate the release mechanism.
I drew a sketch but this particular thread has attachments disabled. Think of an over-center latch.
The disadvantage to this approach is that you cannot vary the kicking energy in software.
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