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 Insulator
- 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 & Bearings
- Inspection of Lower Arm Flexible Connectors
- Inspection of Pantograph Head Shunt Assembly
- Inspection of Pantograph Movement
Lubricants Required For Pantograph
| Lubricant/Grease | Where 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.
 Pantograph | [Project report] | 1281 Kb |
