 In fine, it is absolutely prevented from getting out of hand in the manner that mars the action of so many servo mechanisms |
The detail operation of the power
mechanism is best explained by means of the accompanying
diagram. When the brake pedal is pressed in order to
apply the brake, the hinge C acts as a fulcrum about
which the upper part of the lever A moves forward until
the clearance between its boss and the pin A1 is taken up.
This movement is sufficient by means of a system of
levers F, to open a valve G that places the cylinder in
communication with the induction pipe. The piston thus
moves forward and pulls through a chain upon the bottom
end of the lever A. The movement of the lever A is communicated to the brake rod K through another lever B, which is hinged to A at C, and is fulcrummed at Bl. Actually B1 and A1 are the same but are separated in the diagram for clearness. All the force on the brake rod K is applied through the lever B and comes to this lever through the hinge C. |