Technical problem and representing invention purposes

In the industry of manufacturing one way hydraulic jack especially hydraulic elevators Jack, the computations are designed and considered according to the displacement length (course) and replacement force (joule), which one of the major computations of these long jacks is computation of the bending angle.

This type of computation (bending angle) grows the jack shaft's diameter in long courses, and this case leads to higher energy consumption for much flowing of lubricant mass and consequently moving jack shaft that means growing the size of power unit (a complex of lubricant+ electromotor+ Hydraulic pump and mandatory water faucet and ...), in this design prevents from useless growing of power unit and its accessories.

Expression of the former knowledge and development records regarding to the claimed invention

The first type of Hydraulic jacks was one way form, and in which the cross section (jack shaft) has direct relation with pressure (Hydraulic lubricant).

But it's computation due to considering bending angle in manufacturing other long jacks computed the pressure was created from second parameter jack, that finally the size of shaft diameter shall be increased much such that the bending angle is operable, and this case increased mass (volumetric flow rate) of Hydraulic pump and electromotor.

Bending angle or yield resistance coefficient

When hydraulic jack shaft is under pressure horizontally or vertically on the shaft level, the jack shaft is tensioned that if it is higher than the standard size, the shaft of the first jack bends and then breaks.

Presenting solution for the current technical problem through exact, enough and integrated description about invention

In this design through installing a fixed piston in the shaft (pipe shafts) the jack will be added according to the cylinder, and when the jack shaft opened and closed, prevented from moving total mass of the lubricant of the shaft and moves as per the thickness size of the lubricant shaft wall.

It means that the added piston in the shaft (pipe shafts) was fixed to the cylinder bottom with an axle, and the piston is put in the shaft at the same height of jack neck.

Clear and exact expression of claimed invention's advantages in compare with other invention

A- Reducing electromotor power means reducing electrical consumption, in few cases that has no access on three-phase electricity the single-phase electricity maybe used for elevators.

B- Reducing displacement lubricant mass means increasing lubricant life that is so useful for environment.

C- Reducing the size of hydraulic pumps means reducing energy consumption

D- Closing the bending angle to zero in computations of hydraulic jacks E- By replacing the created force in two ways jacks (differential) can increase tension force from expansion force, such that in hydraulic jacks in few machineries the expansion force is not required.

F- Continuous braking in jacks even when torn up the neck packing of jacks then the second mechanism that is internal piston by making pressure in the shaft prevent from sudden descending and striking shaft jack to the cylinder.

G- Creating few stages force in big size jacks such that the amount of created force will be changeable arbitrarily, for example a 3 cylinder shaft can put pressure as much as required.

Expression at least one executive method for using invention;

For making an elevator hydraulic jack that its movement course is 8 meter and must move a weight at 1500kg, through considering standard bending angle, the size of jack shaft reach to 100mm diameter, which in ordinary status by 50 bar pressure can make 4749 kg force, which this power is much more than the required amount so this case results in consume energy 40% more than average amount, but through applying this design and installing a fixed piston in the shaft the produced force in the jack is 4569 kg, and the required lubricant for displacing will be reduced subsequently, so lower energy is required.