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JAMALPUR JACK

Special Features

The Jamalpur Jack has a capacity to lift a load of 25 Tonnes and four such Jacks make one complete set with a total lifting capacity of 100 Tonnes. These Jacks can be operated simultaneously or individually.

The Jamalpur Jacks have been gaining in popularity chiefly due to low initial capital investment and minimum maintenance needs. It is worthwhile to mention that the performance and cost factor of these Jacks have posed a serious challenge to capital intensive Electrical Overhead Traveling Cranes.

Besides Indian Railways, these prestigious Jamalpur Jacks have been operating successfully at various steel plants and allied industries.

Construction Features

The Jack is rigid and robust. The upright column is fabricated and welded to the cast steel Gear Box. The elevating screw is provided with buttress thread supported with single-acting thrust ball-bearing having a spherical seating at the top and self-aligning ball-bearing at the bottom. This imparts self-aligning properties to the screw under loaded condition. The elevating screw is under tension when loaded and hence there is no chance of distortion due to buckling.
While lifting the load, the Jack rests firmly on its base. For movement from one place to another, the lifting carriage is to be lowered by pressing the yoke which lifts the base and the Jack rests on the three wheels with a ground clearance of 20 mm.

Utility

Jamalpur Jacks have been designed for:

  • Lifting Diesel/Electric Loco for inspection and maintenance.

  • Wheeling and de-wheeling in Sheds/Workshops/C&W Depot.

  • Various other lifting purposes with suitable adaptors.

Specification:                                           

  TYPE—1TYPE—2
  To Suit lifting of Diesel Engine Loaded Wagons To suit lifting of Carriage

(ICF,BEML etc.)

1.Individual Capacity 25 Tonne  15 Tonne
2Total capacity for one set (consisting of 4 Jacks)100 Tonne       60 Tonne
3Total liftof claw1342 mm 1370 mm
4Maximum claw height from ground level2127mm  2000mm
5Minimum claw height from ground level785 mm  630 mm
6

Claw Projection fromCentre of beam.

 538 mm     690 mm
7Ground Clearancewhen resting on wheels20 mm     20 mm
8Hoisting speed      200 mm per minute (Approx)200 mm per minute (Approx)                                                         
9Net weight of one Jack     1.5 Tonne  (Approx)  1.5 Tonne(Approx)
10Overall Dimensions  2781 mm x l22Ommx  1048mm 2781 mm x l22Ommx 1048mm   
11Nature of drive & Power Supply:

Power for the lifting screw is obtained from a specially designed

motorized Gear Box with worm drive. A 5 H.P. Squirrel Cage,

totally enclosed, fan-cooled, horizontally  foot-mounted,

380/415V, 3 phase, 50HZ  Brake Motor is directly placed over

the Gear Box for Power Transmission through a Chain Drive.




Source : Eastern Railway CMS Team Last Reviewed on: 30-09-2011  


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