LIFTING CLAW CARRIAGE
The lifting claw carriage is of fabricated steel designed for lifting under the side of the vehicle & runs on the vertical carriage guides providede on frame. The carriage is mounted on suitable alloy steel rollers fitted with anti-friction bearings. The vertical downward load on the lifting claw is countered by a set of rollers mounted on the carriage against upward frame. The lifting claw is also provided with a chequered plate.
LOAD SCREW & NUT
The load screw & the nut, used in jacks are generously proportioned to withstand regular lifting of heavy loads. The screw of high quality steel having single start buttress thread in accordance with IS:4696. The screw is axially free at the bottom & splined to the warm wheel. The load is borne on a heavy duty ball thrust bearing having a spherical seated housing fixed at the top.
In our Jack the main load nut is of AL-Bronze, conforming to IS : 305 Grade AB-I. A safety steel nut is also provided as a safety device underneath the load nut to prevent any accidental fallng of load. The safety steel nut is controlled with two vertical guides which are fixed to the load nut. If the load nut wears to breaks then the safety nut immediately acts as a support & takes the load. This is a clear indication to replace the load nut, since the load is borne by the safety nut, the jacks would not operate.
DRIVE MOTOR & TRANSMISSION
The jacks are driven by squirred cage motors, totally enclosed fan cooled, foot mounted, operating on 415 volts+-10%, 3 phase, 50 cycleA.C. supply. The power from motors is rransfered to a totally enclosed, oil-immersed reduction gear system, our own make. Each jack is provided with suitably made hand feiven manual handle to operate in case of power failure.
MOBILE CONTROL PANEL & ELECTRONIC SYSTEM
The control of the jacks is from master control panel. The jacks can be operated synchronously, either individually or in a group of four jacks. Suitable safety measures are provided for the synchronous operation of the jacks. Emergency push button stops are also provided on each jack as well as on control panel. All the jacks woukd stop instantly, if any of the jack fails, by prssing any of the emergency push buttons. The jacks will automatically go into locked position in case of power failure, failure of any component or faulty operation to ensure safety. When all the jacks are operating synchronously, all the jackswill stop immediately if any one jack fails, resulting in overloading of other jacks & the overload release will come into action. This eliminates any possiblitity of an accident due to the failure of one jack. Electrical limit switches are also provided on each jack at the extrimities of the lifting claw travel.
BASE
The base is of fabricated steel, incorporating a gear box for the warm and worm wheel which run in oil. All the mechanism for hand operation is carried on the base in portable type (H-type column) only.
MOBILITY
The wheels are mounted on antifriction bearings and are of large diameter, enabling the jacks to be moved easily on shop floor.