5.1 Assign weights to the objectives

Objectives	Weights
Safety	7
Less power consumption	7
Portability	4
User-Friendly	6
Use of standard parts	5
less expensive	7

5.2 PUGH CHART:

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Safety	7	+	Datum	+	-
Power Consumption	7	+	Datum	+	+
User Friendly	6	+	Datum	+	++
Portability	5	-	Datum	+	-
Use of standard parts	5	+	Datum	-	+
less Expensive	7	-	Datum	-	+
Score(+)		25	0	25	31
Score (-)		-12	0	-17	-12
Total		13	0	8	19

5.3 Justification for the scores given :

Design No	Objective	Score Allocated	Justification for the Score
1	Safety	7	stretchers opens upwards does not affect customer
	Power consumption	7	only sensors and motor needs power hence less power consumption
	Portability	-5	cant be portable ( shaft fixed to ground )
	User-Friendly	12	user does not need to control as it is fully automatic
	Use of standard parts	5	silder and crank mechanism is used which is easily available
	Expenses	-7	expensive than datum
2	Safety	0	Datum
	Power consumption	0	Datum
	Portability	0	Datum
	User-Friendly	0	Datum
	Use of standard parts	0	Datum
	Expenses	0	Datum
3	Safety	7	stretchers are very high and less stretchers are used
	Power consumption	7	only motor and sensor is used
	Portability	5	Better than datum ( shaft is not fixed to ground )
	User-Friendly	6	semi-automatic ( manually closed )
	Use of standard parts	-5	geneva mechanism is used (individual parts are not available )
	Expenses	-7	expensive than datum
4	Safety	-7	stretchers open downwards affects customer
	Power consumption	7	only motor and rain sensor is used
	Portability	-5	fixed to ground
	User-Friendly	6	can be controlled from remote
	Use of standard parts	5	rack and pinion mechanism is used which is easily available
	Expenses	7	less expensive (simple model)

FINAL DESIGN :