Parker Hannifin's Cylinder Division has introduced a novel
self-compensating, tapered-flat cushion spear design, which enhances the
smooth acceleration and deceleration of the company's HTR series rotary
actuators. The 'Decelerator' cushion spear configuration is now
incorporated in all HTR rotary actuators fitted with optional
end-of-travel cushioning. The system creates a progressive and effective
deceleration rate that minimises internal actuator loading. This, in
turn, reduces the levels of shock transmitted to the transfer line or
handling system, allowing the use of lighter constructions and avoiding
the need for costly additional hardware such as external shock absorbers
or closed loop electronic control systems.