Improvement of Design and Fabrication of Automatic Wheelchair Convertible into bed and standing modes

Project Title

Improvement of Design and Fabrication of Automatic Wheelchair Convertible into bed and standing modes

Project Area of Specialization Mechanical EngineeringProject Summary

The idea of this project is basically inspired from user requirements to design and fabricate such wheelchair that patient can drive themselves and it can transform into bed when he/she wants to take rest and can be convertible into standing mode for medical therapies. 

Project Objectives

This project is initially attempted by group of four students in batch 2015 of Mechanical Engineering department (Wah Engineering College, Wah Cantt ). There were a lot of drawbacks and deficiencies in that model. The objective of our group is to:

• improve the structural design of wheelchair
• enhance its mobility in terms of forward, reverse, right and left movement 
• enhance control of different postures provided   

Project Implementation Method

• The joystick control connected to Ardino UNO and other control circuits moves in four axis:

1. Upward: two drive motor movers drive wheels in forward direction
2. Downwards: two drive motor movers drive wheels in reverse direction 
3. Right: wheelchair moves right side by caster wheels control 
4. Left: wheelchair moves left side by caster wheels contro

There are three control button on control panel (for bed, chair and standing modes) connected to the Arduino UNO and other control circuits used to control :

1. backseat actuator 
2. two seat actuators 
3. footrest actuator 

Benefits of the Project

The benefits of the project are:

• The maneuverability of patient becomes much easier due to application of efficient control of 12VDC drive motors in wheelchair.
• It is very difficult for spinal cord injury patients to transfer from wheelchair to bed or vice versa, so for this purpose, the convertible bed mode is very helpful.
• For bed mode, comfortable headrest is provided.
• For chair mode, convenient handrests are provided.
• For medical purposes, this model can be converted into standing mode efficiently.
• The seatbelt is also provided for standing mode.

Technical Details of Final Deliverable

• The structural design is modeled on SOLIDWORKS modeling  software.
• Also that model is analysed on ANSYS software.
• All the linkages, motors and bearings are designed using knowledge of Machine Design course.

Final Deliverable of the Project Hardware SystemCore Industry EducationOther IndustriesCore Technology RoboticsOther TechnologiesSustainable Development Goals Good Health and Well-Being for PeopleRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	69900
Hollow SS pipes	Equipment	3	3000	9000
other angles and strips	Equipment	2	500	1000
market visits	Miscellaneous	4	1200	4800
linear actuator	Equipment	4	5500	22000
Drive Motors, chain and sprocket	Equipment	2	5000	10000
caster wheels	Equipment	4	600	2400
Arduino UNO and connection cables	Equipment	2	1200	2400
Joystick and other ICs	Equipment	1	1800	1800
Bearing	Equipment	6	350	2100
SS welding filling rods	Equipment	1	1000	1000
Fabrication work	Equipment	1	5500	5500
Rear wheel	Equipment	2	2000	4000
nut and bolt	Equipment	25	60	1500
headrest and armrest	Equipment	3	800	2400