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.
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.
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.
| || ||TYPE—1||TYPE—2 |
| || ||To Suit lifting of Diesel Engine Loaded Wagons ||To suit lifting of Carriage |
|1.||Individual Capacity ||25 Tonne ||15 Tonne |
|2||Total capacity for one set (consisting of 4 Jacks)||100 Tonne ||60 Tonne|
|3||Total liftof claw||1342 mm ||1370 mm |
|4||Maximum claw height from ground level||2127mm ||2000mm |
|5||Minimum claw height from ground level||785 mm || 630 mm |
Claw Projection fromCentre of beam.
| 538 mm || 690 mm |
|7||Ground Clearancewhen resting on wheels||20 mm || 20 mm |
|8||Hoisting speed ||200 mm per minute (Approx)||200 mm per minute (Approx) |
|9||Net weight of one Jack ||1.5 Tonne (Approx) ||1.5 Tonne(Approx) |
|10||Overall Dimensions ||2781 mm x l22Ommx 1048mm ||2781 mm x l22Ommx 1048mm |
|11||Nature 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.