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2. WHAT IS HYDRAULIC LIFT?
Hydraulic lift is a device used for carrying
passenger or goods from one floor to another
in multi- storied building to raise heavy
objects.

3. HISTORY OF HYDRAULIC LIFT
 The need for vertical transport is as old as civilization.
Over the centuries, mankind has employed ingenious
forms of lifting.
 The first elevator designed for a passenger was built in
1743 for King Louis XV at his palace in France. The
one-person contraption went up only one floor, from the
first to the second. Known as the "Flying Chair," it was
on the outside of the building, and was entered by the
king via his balcony.
 By 1850 steam and hydraulic elevators had been
introduced, but it was in 1852 that the landmark event in
elevator history occurred: the invention of the world's
first safety elevator by Elisha Graves Otis. The first
passenger elevator was installed by Otis in New York in
1857.

4. PRINCIPLE OF
HYDRAULIC LIFT
 Pascal's law is a principle in fluid
mechanics that states that pressure exerted
anywhere in a confined incompressible fluid is
transmitted equally in all directions throughout
the fluid such that the pressure variations (initial
differences) remain the same.
 This law is applied to lifts.

5. TYPES OF HYDRAULIC LIFTS
TYPES
DIRECT ACTING
HYDRAULIC
LIFT
SUSPENDED
HYDRAULIC
LIFT

6. DIRECT ACTING HYDRAULIC LIFT
 When fluid under pressure is forced into the
cylinder, the ram gets a push upward. The platform
carries loads or passengers and moves between
the guides. At required height, it can be made to
stay in level with each floor so that the good or
passengers can be transferred.
 In direct acting hydraulic lift, stroke of the ram is
equal to the lift of the cage.

7. CONSTRUCTION DETAILS
Components of direct acting
hydraulic lift:
 Fixed cylinder: It is fixed with the wall
of the floor, where the sliding ram
reciprocate when we apply the
pressure.
 Cage: It is fitted on the top of the
sliding ram where the load is placed
(i.e. lifted load).
 Sliding ram: It is fitted in the fixed
cylinder which is reciprocate (upward
or downward direction) when we
applied the pressure (i.e. reaches the
floor wise.)

8. SUSPENDED HYDRAULIC LIFT
WORKING :-
 When fluid under pressure is forced into the cylinder, the
ram gets reciprocate to the movable pulleys. With the
help of arrangement of hydraulic jigger; pulley can
rotates; with the help of wire rope the cage is maintain
there pressure force with there floor. At required height,
it can be made to stay in level with each floor so that the
good or passengers can be transferred.
 Working period of the lift is ratio of the height of lift to the
velocity of lift.
 Idle period of lift is the difference of the total time for one
operation and the working period of the lift.

9. CONSTRUCTION:-
 Cage: It is fitted on the top of the sliding
ram where the load is placed (i.e. lifted
load).
 Wire rope: It connects the cage to pulley.
 Sliding ram: It is fitted in the fixed
cylinder which is reciprocate (upward or
downward direction) when we applied
the pressure (i.e. reaches the floor wise)
 Pulleys: pulleys are connected to the
sliding ram and fixed cylinder; where one
pulley is fixed and other pulley is
movable.
 Hydraulic jigger: It consists of a moving
ram which slides inside a fixed hydraulic
cylinder.
 Fixed cylinder-: It is fixed with the wall of
the floor, where the sliding ram
reciprocate when we apply the pressure.

10. APPLICATIONS OF HYDRAULIC LIFTS:
1. • Wheel chair lift.
2. • Industrial hydraulic applications.
3. • Material handling.
• Truck trailers.

11. MODERN INNOVATIONS
 Now days the speed of hydraulic lifts has been
increased enormously.
 By using working oils in hydraulic actuators while
energy recovering operation is performed by the
hydraulic lift device, occurrence of pressure
pulsation in the working oil can be prevented, and
energy recovering efficiency is increased.