5Wheel Stair Climbing Trolley

1. I
Abstract
This project aims at developing a mechanism for easy transportation of heavy loads
over stairs. The need for such a system arises from day-to-day requirements in our society.
Devices such as hand trolleys are used to relieve the stress of lifting while on flat ground;
however, these devices usually fail when it comes to carrying the load over short fleet of
stairs. In the light of this, the project attempts to design a stair climbing hand cart which can
carry heavy objects up the stairs with less effort compared to carrying them manually. It also
endeavors to study the commercial viability and importance of such a product .Several
designs were conceived that would allow a non-industrial hand trolley to travel over stairs,
curbs, or uneven terrain while reducing the strain on the user. In our project, the trolley is
equipped with Five-Star wheels which enable us to carry load up and down the stairs. It also
eases the movement of trolley in irregular surfaces like holes, bumps, etc.

2. II
LIST OF TABLES
TABLE
NO.
TABLE PAGE NO
6.2 Handle 21
6.3 Axle 21
6.4 Wheel 22
6.5 Bush 23
6.6 Bearing 23
7.1 Material cost 24
7.2 Machining cost 25

3. III
LIST OF FIGURES
FIGURE NO. FIGURE PAGE NO.
4.3 Close-up showing surface roughness 9
4.4 Type of wheel frame 10
4.5.1 Cad model of trolley 11
4.5.2 Isometric view 12
4.7.1 Prototype of stair climbing trolley(side view) 15
4.7.2 Prototype of stair climbing trolley(front view) 16
5.2 Force necessary to pull the trolley 19
9.1 Modified wheel frame setup 27

4. IV
LIST OF SYMBOLS
SYMBOL DEFINITION
F Force
M Bending Moment
R1, R2 Reaction Forces
I Moment of inertia Bending Stress
y Distance between neutral axis and
central axis
E Young’s Modulus
R Radius of Curvature
X Height of the trolley
Y Distance between mid-point of the
weight and trolley wheel axis
W Weight acting on the trolley
W1 Weight of object to be carried
W2 Weight of the trolley
Re Reaction force on one side