Note: This text is a work in progress. If you find any inaccuracies or material that needs to be included, please contact us.
Prototypes
Our first prototype is made with LEGO® TECHNIC® parts and uses a cam sliding over a bar to get the bidirectional motion:
The second prototype is a refined LEGO version which works more smoothly and can actually lift small objects:
Here are some videos of the second prototype operating:
- The cam mechanism and closing spring (0.7M) – The cam provides the reversing action as it travels past the midpoint.
- The pulley and return spring (1.1M) – The return spring weakly pulls the hook back open in voluntary closing mode.
- Lifting an object (3.1M) – Note that the closing spring is too weak to lift it, but it can be lifted in voluntary closing mode.
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