Both Hydraulic Jacks and Caterpillar Skates are used to lift heavy items but are used in different situations. In both cases people don't make an effort in picking up the item; the system is made in such a way that applying small strength gives great results. What you cannot move on your own from one place to another because of its weight, you can do that with the help of these devices.
While the skates are used to pick up really heavy things to move them from one place to another, the function of hydraulic jacks is only to lift items. The most common example for the usage of the jack is when repairing your car. There are many different types of jacks available in different sizes and designs. There are also larger ones for professional usage, which are used mainly by the auto service.
Suppose you are going on a long journey but your wheel gets a puncture. You cannot change your wheel all alone as you don't have enough strength to lift the car. The Jack is the device that is needed for such emergencies, which should be kept in the emergency kit of every car. In an event that you need to lift the car to replace the wheel, you put the jack towards the front wheel of the car, there is a special place for the jack. With a manual motion, gradually the car starts to rise and soon the wheel is in the air. Finally you can remove the damaged wheel to be replaced by the spare. This can be done in ten to fifteen minutes.
In conclusion Hydraulic Jacks and Caterpillar Skates are really very helpful in lifting heavy weights. Many emergencies and day to day industrial jobs are dependent on their uses.