The Brilliant Engineering behind Pantographs!
Pantographs are a special device mounted on electric trains to collect current from one or several contact wires. They consist of a pantograph head, frame, base, and drive system, and their geometric shape is variable.
Pantographs are typically operated by compressed air from the vehicle's braking system, either to raise the unit and hold it against the conductor or, when springs are used to effect the extension, to lower it. As a precaution against loss of pressure in the second case, the arm is held in the down position by a catch.
Pantograph strips are often made of steel, copper alloy, pure carbon, and metal-impregnated carbon, which have different principles of interaction with the contact wire. Carbon strips have smooth surfaces and no rough parts that may abrade the contact wire.
The Brilliant Engineering behind Pantographs!
Pantographs are a special device mounted on electric trains to collect current from one or several contact wires. They consist of a pantograph head, frame, base, and drive system, and their geometric shape is variable.
Pantographs are typically operated by compressed air from the vehicle's braking system, either to raise the unit and hold it against the conductor or, when springs are used to effect the extension, to lower it. As a precaution against loss of pressure in the second case, the arm is held in the down position by a catch.
Pantograph strips are often made of steel, copper alloy, pure carbon, and metal-impregnated carbon, which have different principles of interaction with the contact wire. Carbon strips have smooth surfaces and no rough parts that may abrade the contact wire.
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