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[Interview] SM2 CEO Jang Sa-yeong
Innovation of descending device with reinforced safety and portability 
Obtaining various patents with unique technology

Introducing innovative portable descending device
Patents for aviation sten wire and pad brake

A descending device enables a person to escape a building on fire through a rope. But many existing products took a lot of space in veranda which make it tiresome to maintain and repair and some people do not even install the device for this reason. For this, Jang Sa-yeong, CEO of SM2, developed an innovative portable descending device. The existing products were bulky and the rope was very thick if it is to be used in a tall building. Jang's, on the other hand, reduced thickness of the rope significantly while increasing tensile force by using an aviation sten wire and a car seat belt to prevent the person getting up-side down by a leg caught on the things of wall. You can also adjust the speed by using a pad brake, hold the opposite rope when you roll it up and down by using an internal bearing, and the handle grip (basically fixed) can be used when you roll up the device to reverse direction. These are all patented technologies Jang developed. 

"Impractical safety regulation need to be improved urgently"
An innovation of descending device that saves lives

Jang decided to develop a device to save people when watching 9.11 on TV. Then he also felt a need to improve current safety regulation. Jang said "the current safety regulation was made 30 years ago by Korea Institute of Fire Safety affiliated to Ministry of Government Administration & Home Affairs. But there are many elements that are not practical or reflect new social structure. I hope that the regulation need to be improved for descending device to be also used more than a 10 storey building", adding that "the department recently raise the working load of descending device from 1000N to 1500N but safety belt is 6500N and reduction gear 3900N. This is nonsense as the rope likely to be cut but they apply inconsistent standards. Also, even though the rope is designed for 1500N, we cannot develop a product unless it does not satisfy the standard of 3mm rope regardless its kind and materials we use. In addition, the approval period for new product takes 45 days but this is too long for us to carry out a speedy R&D and registration." Jang continued "most people live selfish until they die. Only a few people try to make something to save lives. We can use airplanes, trains, cars and electricity because there were people who developed these. Therefore, I want to be one of them and contribute to saving lives through developing innovative descending devices." 
 


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