This is a simple model of two Meccano men — a teacher writing on a blackboard, and a man lifting weights.
Teacher and weightlifter
The mechanism is driven by an electric motor, geared down using two sets of worm gears and pinions, driving a shaft which runs the length of the model. At each end of the shaft is a bush wheel with an eccentric bolt. One end of a piece of thin wire is secured to this bolt and the other end is secured to one of the arms.
The mechanism
Modernised version
The ‘modern’ version of this model has a whiteboard rather than a blackboard since these are no longer used in schools!
It uses repainted parts, a simplified mechanism utilising a geared electric motor, and a ‘box’ constructed from all Meccano parts.
A modernised version of the teacher and weightlifter