So to address this, a new safety feature called the skirt brush was added to the escalator in 1982. Escalators are full of subtle safety features like this, some old and some new, but almost all of them are designed around people.All the way back in 1896, Jesse Reno predicted that riders on his attraction would need something to hold onto, so he introduced a moving handrail.
It's a convention we still often follow to this day, but as it turns out, there's a much better solution than the shunt. Modern escalator steps aren't smooth, they're grooved. These grooves then interlock perfectly with a comb plate at the top of the escalator .
A modern version of it works something like this. A typical subway escalator has an electric motor at the top with a power output of around 50 kilowatts. Smaller than most electric cars.
All the way back in 1896, Jesse Reno predicted that riders on his attraction would need something to hold onto, so he introduced a moving handrail. In a modern escalator , the motor has a separate connection to turn a friction wheel that drives the handrail. The only problem is that friction wears things down.
Often this is channeled back to the building's internal grid and used to power other devices, including the upward escalators . - So even the escalator that was invented by George Wheeler and was installed in 1920, the Paris Exhibition, et cetera, I mean, all these escalators were regenerators.
This is when the last line of defense kicked in. When the escalator speed rose by more than 20%, the auxiliary brake triggered driving steel wedges into a disc on the drive shaft. But when investigators opened up this brake, they were shocked.
Hold it for a count of four. We stand on an escalator , or we take an elevator.
of people in this country and also in other Advanced industrial countries who are on a downward escalator and that is frightening Hillary Clinton began her
Think IBM trying to have a computer that plays chess, or a computer that plays Jeopardy!, and all the stuff that you guys do. I saw a curved escalator a couple of days ago.
Think IBM trying to have a computer that plays chess, or a computer that plays Jeopardy!, and all the stuff that you guys do. And a curved escalator , it was fantastic.
Kaufman: One level up, cross your arms. This thing's an escalator .
in the 21st century, if the Color Revolutions and Arab spring end up successful it's long been noted that they were fostered by the rise of the Internet and social media. Finally there's the escalator of reason, the possibility that the expansion of literacy education and public discourse encouraged people to just more abstractly and more universally. People would rise above their parochial vantage point. They were less likely to privilege their own interests over others. They replaced a morality based on tribal authority and puritanism with
You just end up with a jagged mess for longer. So how do modern escalators solve this problem? I mean, have you ever stopped to think what happens to the stairs at the top of the escalator when they disappear?
- Yeah? - Yeah. - But despite all modern escalators adopting Wheeler's design, at the time, it caught so little attention that he was forced to shelve the idea. It wasn't until eight years later that another inventor, Charles Seeberger, bought his patent and capitalized on the invention.
of the fair. Shortly after, escalators started being installed in different places across the world. But these escalators weren't perfect. They had smooth flat stairs, and when they reached the top, these stairs would disappear under a wooden board, leaving a dangerous gap between them.
The speed of the steps themselves is also something that needs to be carefully controlled. And modern escalators use AC induction motors, which are extremely good at regulating their rotational speed. And this has an unexpected benefit on downward escalators .
- No, it's like the down escalator 's a generator? - This regenerative braking makes escalators extremely power efficient, but more importantly, it makes them inherently safe. But there is a point where if you keep adding weight, then eventually the force becomes so strong that the motor can no longer resist it.
OK, great. Ice cream or cake or ice cream. Elevators or escalators . Escalators interesting reading or writing. Writing for me. What's your favorite day of the week.
Really cool stuff there. Do you hate escalators ?
So investigators began dismantling the wreck, tearing it down piece by piece to reconstruct what had happened. The ride people experienced on that escalator was one of the most terrifying rides of their lives. But maybe it's more similar to the origin of escalators than you might think.
But maybe it's more similar to the origin of escalators than you might think. Like what was the first escalator even used for? Do you wanna have a guess?
- The solution to this problem came from another inventor named George Wheeler. His idea forms the basis of every escalator in use today. A modern version of it works something like this.
You can actually try this yourself. Next time you're standing on an escalator , just place your hand next to you as you stand still, and you will watch as your hand slowly drifts forward. This speed difference stops the handrail from lagging too far behind the steps over time.
Inside it lists the exact sequence of events that led to the disaster. As fans crowded onto the escalator , their combined weight increased the load on the main motor. The motor tried to resist this change, but as more and more people funneled on, the force got too high, and eventually it hit a tipping point
Western countries. So what you're seeing here is a person who is running up a down going escalator . And this metaphor of this escalator I will explain later is the basis of the social condition right now in Germany. First of all, what happened in Germany that Germany was regarded as such a successful country?
You've got your first stable job in their early 40s. And this is what I call the "escalator effect." So this "elevator effect" was about rich and poor people are going up together. But maybe, you know, an escalator which is going down-- when I was younger and had much less weight, I was able to run up a down going escalator .
Everyone else is dead silent. Like this was Hamm goes up an escalator .
They're trying to draw attention to the fact that, in some way, their communities are aggrieved, and that they haven't had their foremost concerns thought about. Because Donald Trump came down those escalators and blasted undocumented immigrants.
At 7:05 pm, the third and final safety system failed, and the stairs began to plummet. Fans were flung forward and started streaming down the escalator . Some lept over the central barrier in desperation, while others were swept into a crushing pileup.
But the comb plate doesn't entirely solve the problem. We still have these gaps on the side of the escalator that can pinch and trap objects as the steps move. So to address this, a new safety feature called the skirt brush was added to the escalator in 1982.
Yeah, they're not getting serviced. The next time you see somebody fixing an elevator or an escalator check out how much gray hair there is. There's a bunch of them that have got a lot of gray hair.
Now, obviously, there were no escalators in the stone age. So there's nothing natural about taking an escalator . But it is natural to try to avoid unnecessary physical activity, because until recently, energy was limited.
So we have three images here that I just found on the internet. Right here we have two people on an escalator going down. This is my personal, like, rage moment, where I'm trying to get to work or something and like, why is there-- why is that person dressed like Ronald McDonald?
Turn the stairs into pianos that make a noise when you step on the keys as you go up, and that has a significant effect on the number of people who actually use the stairs rather than the escalator . So there's a huge amount of potential to use behavioral science and psychological understanding for good.
I'd kind of like to be on the up escalator .
The ride people experienced on that escalator was one of the most terrifying rides of their lives. But maybe it's more similar to the origin of escalators than you might think. Like what was the first escalator even used for?
And modern escalators use AC induction motors, which are extremely good at regulating their rotational speed. And this has an unexpected benefit on downward escalators . With enough people riding, their weight is enough that the motor no longer has to power the ride.
Tests after the incident showed that its braking force was far too low, around 37% of the manufacturer's specification. The weakened brake struggled to slow the spinning motor and the escalators downhill acceleration continued. This is when the last line of defense kicked in.
We were not designed to order sushi and ride escalators .
At 7:03 pm, around 50 people were riding the long escalator down to the platform, but within 30 seconds, the crowd had swelled to nearly double that. Everything seemed fine, but inside the escalator was a problem. The weight of the passengers was bearing down on the steps, and the load on the main motor was increasing.
The motor finally reached its limit, and under the massive strain, the drum began to slip. With the motor losing control, the escalator triggered its second line of defense. A safety relay tripped, immediately cutting power to the motor.
This motor spins extremely fast at over a 1,000 RPM, but it's pretty weak. So to drive the steps, the escalator needs to convert this into a slower output with more force. To do this, it uses a reduction gearbox in a gear system, lowering the output to just a few RPM and increasing the torque by a factor of around 100.
In total, 51 million people flocked to the exposition to see the marvels of modern technology. But one of the most popular exhibitions was the world's first true commercial escalator . The machine drew huge crowds.
Modern escalator steps aren't smooth, they're grooved. These grooves then interlock perfectly with a comb plate at the top of the escalator . So now, if a small item approaches the end, the comb plate lifts it up and out of harm's way.
- What? - Yeah, when there were people standing on the escalator in down direction, these escalators were feeding energy back into the grid. - No, it's like the down escalator 's a generator? - This regenerative braking makes escalators extremely power efficient, but more importantly, it makes them inherently safe.
Two massive arms clamped down on the drum to lock it in place and avert a runaway. This break should have had enough stopping power to bring the fully loaded escalator to a halt, even under the massive strain, but it didn't. Tests after the incident showed that its braking force was far too low, around 37% of the manufacturer's specification.
to society at large so we can sort of speed up the escalator of mobility, which seems to have slowed down in our society.
So if you've ever been in an airport, or a subway stop, or a mall, or whatever, where there's an escalator next to a stairway, and you have that little voice in your head that says take the escalator . Now, obviously, there were no escalators in the stone age.
It's sometimes fun. But you're a little bit out of steam when you're in the next part. But for many people, this escalator which is going down is the daily experience of their life. It's not the reality that everybody is experiencing some social decline.
not numbers of jobs the problem is the quality of the job both in terms of income and job security we have more and more people who are on a downward escalator in income and also very importantly more people are worried about about where their income will come