This manual suspended scaffolds/suspended platform can has application on some special place for maintance work where is limited for the electrical power using,because it has not electrical hoist and other electrical parts.With two mechanical devices on two sides and with chains connecting to one hand operated wheel,the working platform can move up and down smoothly.For safety,using two Centrifugal Speed-Limit safety lock are used.
If you want to use suspended platform on some place with  no or limited electrical power,this is a good choice.

Manual Suspended Scaffolds/Suspended Platform-No Need Electrical Power