The chipper 660 series can be supplied with an award winning collapsible counter-blade mounted on a running slide and secured with adjusted shear bolts.
Whenever a hard body is accidentally entered into the chipper, the bolts are sheared and the counter-blade falls down, so that the foreign body exits before causing damages.
A foreign body is accidentally introduced into the chipper
Chipper without foreign body protection
Chipper provided with collapsible counter-blade
Example of a steel hinge introduced and ejected from a Pezzolato wood chipper with collapsible counter blade.