Chapter 8 Machines
235
Input motion
Output motion
Fixed pivot
gure 8-15. In a reverse motion linkage,
the pivot is fixed at the center of one lever.
Input force equals output force.
Input motion
Output motion
Fixed pivot
gure 8-16. In this example, the pivot has
been moved closer to the output motion. Is the
input force increased or decreased at the output?
gure 8-17. A simple pulley changes
direction once.
Pulley
Resistance
arm
Effort
arm
F
Fulcrum
Resistance
Resistance
Effort
Effort
gure 8-18. Look at this drawing
and explain why a pulley is a special
type of Class 1 lever.