This presentation summarizes a student project to design, prototype, and control a hospital cot. The objectives are to allow sliding the sleeping surface between two beds and introducing five types of motion in a single bed. The project uses rack and pinion gears to enable sliding, and air pumps to inflate the right and left sides of the bed. Sensors and motors are controlled using a microcontroller. Materials were selected based on mechanical properties and cost. The presentation provides details on the motor, controller, and other mechanical components designed to safely support patients.

1. Final Year Project
Presentation
“Design ,prototype and controlling of
Hospital Cot”

2. PRESENTED BY:
PRESENTED TO:
FINAL YEAR PROJECT COMMITTEE
DEPARTMENT OF MECHANICAL
ENGINEERING
• Nausherwan Ahmad UET-12-ME-SCET-06
• Asif Durez UET-12-ME-SCET-02
• Hassan Shehwar Shah UET-12-ME-SCET-24
Abdul Rafay
ASSISTANT PROFESSOR
( MED SCET )
Project supervisor

4. PROJECT OBJECTIVE
The main objective is to slide sleeping
surface from one bed to another bed
Introducing 5 types of motion in a single
Bed
Inflation of right and left side

5. BACKGROUND
We have chosen a path to implement our innovative ideas in the form of this
project named as Design ,prototype and controlling of Hospital Cot. The
basic concept, which is emerged out from our project is to Provide ease to
the patient .
• Sliding Motion are designed to a specific application and location.
• Rack and pinion Mechanism used for this purpose is cheap in cost and
easy to handle
• Inflation of right and left side is accomplished using air pump ,we insert air
in a parachute made bed sheet

6. Features of project
There are various FEATURES of our project. It can offer number of
advantages to the user. Our project has some of the most
countable features that have mentioned below:-
• Automatic: In automatic transmission, patient should be moved
without help of nurse
• Manual :Manual operation permits the patient to move bed by
herself/himself using controls
• Motors can handles weight up to 50Kg.
• Structure can handle weight up to 250kg

7. Material Selection

8. For material selection following are the parameters
which should kept in mind
Mechanical properties
Physical Properties
Manufacturability
Cost

10. Bed Structure

11. Sr. no. Parameter dimension
1 Length 7ft
2 Width 3ft
3 Height 1.38ft
4 Elevation 75degree
5 Declination 20degree
6 Mattress 3ft *7ft
7 Weighing capacity 150kg
8 Maximum motor load 50kg
Parameters

12. Caster Selection

13.  Casters also come in a variety of sizes, mount
types and load rating ranges to withstand
diverse weight capacities
 In any medical caster, it's a high priority to
reduce operator strain and provide patient
comfort especially on hospital beds.
 Medical casters have been used for
diagnostic equipment, hospital beds, hospital
carts, stretchers, IV poles and other mobile
medical equipment.
 Additionally, casters come in a variety of
aesthetically pleasing designs to avoid looking
industrial or threatening to patients.

14. Sr.No Iteam Description
1 Caster Type Swivel
2 Wheel Width 25mm
3 Wheel Description Solid Rubber on Nylon
4 Wheel Bearing Plain bore
5 Load Rating (lbs) 154
6 Mount Type Plug-in pin
7 Mounting Plate 43mm
8 Bolt Hole 11mm
9 Wheel Material Solid Rubber
10 Wheel Diameter 100mm
11 Overall Height 121mm
12 Manufacturer Blickle

15. Controller (Forward and Backward Switch)

16. The motor will run only as long as each pushbutton switch is held down. If
we wanted to keep the motor running even after the operator takes his or
her hand off the control switch , we could change the circuit in a couple of
different ways: we could replace the pushbutton switches with toggle
switches, or we could add some more relay logic to “latch” the control
circuit with a single, momentary actuation of either switch. Let’s see how
the second approach is implemented, since it is commonly used in
industry

17. BLOCK DIAGRAM

18. BLOCK DIAGRAM

19. BLOCK DIAGRAM

20. Motor Selection

21. AC Motors
• Selection of motors on the basis of its output power .This is a
condenser-run type induction motor, designed for durability
in repeated clockwise and counter-clockwise rotations as in
door actuators and lifts. This kind of model has high starting
torque and short acceleration period. The maximum
continuous running time is 30 minutes. When the motor is
stopped for a long enough time, it can be used for a longer
period in a repeated manner. The output is 6W to 120W.
The rated voltages are 100V, 115V ,220V, and 240V it is
recommended to select an appropriate motor type that will
fit the load characteristics and user’s conditions.

22. Motor Pics

23. AC GEAR MOTOR
AC gear motor operates on 220 volts and is controlled by the
Microcontroller. Three AC gear motors are present here; one
is on Leg side and second is on head side third motor is for
sliding motion The motors are interfaced with the controller,
when the signal is received the motor starts to work.

24. Rack and Pinion

25. The Rack & Pinion block represents rack and pinion gear that converts
between translational and rotational motion. The rotational-translational gear
constrains the pinion (P) and rack (R) to, respectively, rotate and translate
together in a fixed ratio that you specify. You can choose whether the rack
axis translates in a positive or negative direction, as the pinion rotates in a
positive direction, by using the Rack direction parameter
Sr.No 1st
Rack 2nd
Rack Pinions
Width 0.7inch 0.7inch 0.7inch
Length 21inch 15.5inch 36inch
Teeth 79 59 34

26. Sliding Channel

27. The main objective of this project is to slide sleeping surface from one bed to
another bed. For this purpose we use a Sliding channel of length 0.125Ft
and Width of 3ft and we weld wheels

28. TIME AND COST ANALYSIS
Sr Item Cost
1 Material
2 Traveling
3 Labor cost
4 Thesis
5
6
7 Total

29. PROJECT PARTS
The Design ,prototype and controlling of
Hospital Cot is divided into two basic parts:
• Electronic part
This part of the project consist of electronic circuitry(Switch) and all the
Ac motors which is used to work together with the mechanical structure .
• Mechanical part
Mechanical part of the project is consist of the basic structure of hospital
bed which is used to slide patient from one surface to another.

30. PROJECT APPLICATIONS
• Transfer of patient
• Provide Free hand to patient

31. FUTURE ENHANCEMENT
•
Our project contain wired Switch panel which would be
used using 220v,In future we will use wireless remote for
this purpose using any latest technology.