647 Chair Foot Extension Troubleshooting

This illustration highlights the main components of the foot extension mechanism.

Locking Mechanism

When either foot extension lever is pressed, the associated linkage retracts the two locking devices. When the teeth on the locking devices disengage the slotted plates, the foot extension can be extended / retracted as desired.

When the foot extension levers are released, the torsion springs cause the locking devices to engage the slotted plates, locking the foot extension in place.

The foot extension crash limit switch

The foot extension crash limit switch disables the Base Down and Tilt Down functions when it is tripped. The switch is tripped when pressure is applied to the bottom of the foot extension due to contact with an object.

The limit switch does not affect the mechanical function levers of the foot extension.