Pantograph

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A pantograph is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line drawing is traced by the first point, an identical, enlarged, or miniaturized copy will be drawn by a pen fixed to the other.

Because of their effectiveness at translating motion in a controlled fashion, pantographs have come to be used as a type of motion guide for objects large and small. A common example of the use of a pantograph assembly as mechanical guide frame is the extension arm of an adjustable wall-mounted mirror.

Main Components of Pantograph

  • Base Frame
  • Lower Arm
  • Upper Arm
  • Fourth Arm
  • Pan head
  • Rasing Cylinder
  • Over Geight Detector
  • Air Control Schematic
  • Control panel
  • Air Feed Insulator
  • Foot Insulator

Pantograph Assembly


Different types of pantograph assemblies are

  • Base Assembly
  • Lower arm Assembly
  • 4th Bar Assembly
  • Upper Arm Assembly
  • Pan Head Assembly
  • Air Equipment
  • Raising Cylcle Assembly
  • Foot Insulator

Equipment Hierarchy

Ratings & Specifications

  • Setting of Pressure Switch PS1 : 3.9 Bar (Upper Range) - 1.0 Bar (Lower Range)
  • Setting of Pressure Switch PS2 : 5.0 Bar (Upper Range) - 1.5 Bar (Lower Range)
  • Contact Force : 90 +/- 5 Newton
  • Min. Pre. to Raise Pantograph : 3.9 Bar
  • Min. Pre. to Maintain 90N Con. Pre. : 5.5 Bar
  • Raising Time of Pantograph : 3 +/- 2 Sec.
  • Lowering Time of Pantograph : 4 +/- 2 Sec.

Precautions While Working on Pantograph

  • Pantograph should be lowered
  • Overhead line should be properly de-energied & earthed
  • Safety belt should be used while working on pantograph
  • Availability of compressed air supply is needed in near by

General Maintenance Of Pantograph

  • Cleaning, Inspection & Re- greasing of InsulatorĀ 
  • Inspection of Upper Arm
  • Inspection of Base Frame
  • Inspection of Lower Arm
  • Inspection of Pantograph Head
  • Inspection of 4th Bar Assembly
  • Inspection of Air Equipment
  • Cleaning, Inspection & Re-greasing of Elbow Chain
  • Checking & Re-greasing of Exposed Threads & BearingsĀ 
  • Inspection of Lower Arm Flexible Connectors
  • Inspection of Pantograph Head Shunt Assembly
  • Inspection of Pantograph Movement

Lubricants Required For Pantograph

Lubricant/GreaseWhere it is Used
Bicc BX-1 Conductive Mating Surfaces
Grease Shell Albida R2 & Alternatives: Esso Beacon 2 Bearings,Grease Nipples and general protection
Rockoil 410 Elbow Chains
Dow Corning DC4 Silicon Protective Grease Insulator Surfaces

Please go through the attached document for the systems AutoCAD drawings.
Attachments:
Download this file (Pantograph.pdf)Pantograph[Project report]1281 Kb