Testing the limits - The Free-Fall Test
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- čas přidán 28. 03. 2017
- What happens when we let an elevator weighing tons drop hundreds of feet? We do it all the time, just to make sure that they are safe for you. See how. www.kone.com/en/company/innova...
- Věda a technologie
"AUDIOJUNGLE"
They save the Money for the Good Stuff!
Hahaha😂
I am a retired elevator mechanic and have performed hundreds of five year full load overspeed safety tests. I have seen various failures happen during a few of those tests but only had two units that I can recall that the safeties did not set and they went fully loaded into the pits at very high speeds. One was due to a governor that would not trip and the other was due to wind up safeties that were rusted in place. Both of these units were "non contract" customers who were in a state that did not require building owners to subscribe to service contracts with elevator service companies who in turn kept the elevators in safe operating condition.
I was in a kone lift before christmas. The elevator jammed then fell the breaks screamed and we landed on something which bounced us around it happened 15 times in 45 minutes it's still being investigated but I'm trying to understand what actually happend to me. I've been left traumatised and have severe whiplash with a locked neck and a back injury the doors would not open and the emergency phone didn't work either
@@SergeAndOkkieForever the hydraulic stop at the bottom of the pit is what most likely stopped you and gave you whiplash.
This is why I don't trust elevators
김기태ㅍㅌㅍ거래소휴쇼타ㅕㅠㅕㅝㅝㅓㅕㅗㅕㅓ아쏘리세/쇼케회의에에피피ㅍ 피피프로필ㅜ ㅎㅎㅍㅍ퓨ㅠ
Hello, I have an important question to ask you!
@@SergeAndOkkieForever hello can u please tell me more.
Who else is here from the Cheddar vid comments? Watching this vid I see that Cheddar took footage from *this vid* yet still got their explanations wrong.
“Setting the safeties” is the correct term. The elevator will then have a measurement which is the “slide”. The slide is the distance (markings) on the rails that tell you how many inches it took to properly slow down and eventually stop the car. There are requirements for how much slide you can have depending on the “rated speed” of that elevator. More commonly used now days along with other safety devices is the “Hollister-Whitney rope griper”. At anytime the safety circuit for an elevator equipped with a rope griped is broken the rope gripper will clamp all hoist ropes simultaneously. So for all the crazies out there that picture all cables breaking including governor rope there are other means associated with bringing a car to a complete safe stop. Yours truly, Elevator Mechanic Indianapolis
Yeah, I was thinking what if the governor rope broke also. I'm sure that happened on 9/11.
Nice information on how lifts stop, coming from an Otis lift engineer.
I love all your lifts because I am addicted to lifts
si no fuera por la mala administración de kone México sería un excelente lugar para trabajar, muy buena la tecnología de estos equipos
Very informative!
which software is it used to design the whole elevator? thanks
Blender or 3D Max or Cinema 4D
We need a purely mechanical version of this, without the digitally controlled servo
It is a mechanical servo, the springs keep a safe decelleration so you don't break your neck. Obviously tested thousands of time in the lab and every five years in each installed elevator.
.that is basically 150+y old technology ..modern elevators should use safe mechatronic speed governors (e.g. Wittur EOS) to trigger not only on overspeed but also on over acceleration, that is much safer and obviously quicker....it may save lives if main brake fails with open doors while passenger exit or enter the car ....acting solely on over-speed in that case would be fatal in most cases....
So you are talking about unintended movement protection?
The brake only holds the car in place
I want to know what type of safety equipment used to protect from free fall of material lift in industry
Over speed governor
watch the video!
@@togatherwe2892 wrong!...at least very incomplete answer...watch the video!....the speed governor trigger the safety gears under (and/or over) the car frame....
1:04 Elevtaor
Why did you steal the music from Audiojungle?
Crazy Clown Agreed, but it's a big company doing this, so they may have problems...
I don’t like this
who
I got stuck in a elivator when I was 9 years old
Got ur lifts @ school
Nice video
Well i’m still afraid of these things…happily use them but still scared
NICE.
1:12 elevtaor?
Why not using for safety to upwards
Rajarathinam Boopalan They are using it in all directions.
@@xavier6130 We didn't have them earlier; some of Kone's governors did not protect the upwards direction.
Because the maximum downward acceleration is a lot greater, in the event that the cables break. For a counterweight that is 25% heavier than the empty elevator cab, the maximum upward acceleration in the event that the motor fails would be 1.1 m/s^2. The maximum downward acceleration would occur when the cable breaks, and be 9.8 m/s^2.
A fall after a broken cable is a lot more of a concern than a fall after a failed motor. The counterweight is specified to be as heavy as the elevator cab when carrying the average payload, so a failed motor could cause it to fall either way, but it will be a much more gentle fall than if the cable breaks.
А что за музыка
ok so IF it failed the maxiumum speed it would reach would be 13m/s?
your question does not make any sense....watch the video!....every elevator has a rated speed, lets call it VKN which maybe anything between 0.3m/s to 20+m/s....the speed governor would trigger at aprox. 1.2*VKN , engaging the safety gears.....so, if VKN=1m/s the threshold will be ~1.2m/s....if your elevator is a VKN=10m/s one that threshold is 12m./s.....this is all 150+y old technology ...modern elevators use or should use safe mechatronic speed governors to trigger not only on overspeed but also on over acceleration, that is much safer and obviously quicker....it may safe lives if main brake fails with open doors while passenger exit or enter the car ....acting solely on over-speed in that case would be fatal in most cases....
What...nothing about the pit buffers and the 5-year test? C' mon!
The lift doesn't freefall down, it freefalls up!!!!
Because the counterweight is heavier than the lift car.
but if the cables snap then elevator is not connected to the counterweight anymore
Just one cable can support the elevator but there are usually 5-6 cables that are used (mainly for traction purposes). But suppose all 5 cables snapped--the elevator is still connected to the governor, a mechanical device, via a separate cable; and this will engage (mechanically) the safeties or brakes.
And if all cables snap simultaneously (including the governor cable) then the elevator falls down at high speed !
Only early safety gears (without o/s governor) could prevent this.
And how would that happen again?
Rowan & MartinYTCZ
Case in point. Just finished the cabbing up the car of a basement configuiration hoisting machine. Over the weekend the sprinkler system saturated the brake & of course the counterweights sucked the cab up into the hoisting beam ruining the cab & distorting the sheave's alignment as well. Yep cabs can fall up easier than down. Dover Elevator Mechanic's Helper 1981
"the answer is, certainly not" so what about the 900~ elevators that fall every year?
I mean top comment answer it well 5 years ago. but basically a lack of being maintained properly by the building owners
AUDIOJUNGLE
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Good too nicee vidiypoo next vekkk aploddd you newee vidiyodss
ROSOLLA
Neat . 🍒
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