Nail Driver Plunger and Weight Mechanism for Durability

The patent divides the power transmission system into two independent paths: one path (active member → first pulley → first wire → plunger) and another path (weight → second pulley → second wire → plunger). This segmentation eliminates the common pinion gear connection, so that when the active member suddenly stops, the impact does not transfer to the weight or its transmission components, preventing gear breakage while maintaining reaction force reduction through coordinated independent movement.

The patent separates the coupling mechanism into two independent wire systems: a first wire connecting the active member to the plunger, and a second wire connecting the weight to the plunger. Each wire operates independently without sharing common connection points. This eliminates the risk that sudden stopping of the active member will transmit impact through a common wire to the weight or connecting parts, preventing disconnection while maintaining the reaction reduction effect through independent coordinated movement.

The patent merges the transmission of reaction forces through the common plunger while keeping the driving paths independent. Both the active member and weight independently drive the plunger through separate wires and pulleys, but their forces combine at the plunger to achieve the fastening action. This merging approach allows independent movement (reducing impact risk) while maintaining a relatively simple overall structure through force consolidation at a single point.