3 ms·
People with reduced mobility or reduced vision will love instant closing guilliotines.
by LoSboccacc 9y ago
People with reduced mobility or reduced vision will love instant closing guilliotines.
- jjoonathan 9y agoThe door closing mechanism is designed with limited power and there's an optical sensor to prevent it from even trying to close on someone. Why wouldn't that still be the case on a fast closing door? More tellingly: fast closing doors are absolutely a thing, so clearly the safety issues are not insurmountable, but I only see them in more modern/expensive locations. I suspect it's a price grading move and if you wait another century fast-closing doors will be everywhere.
- LoSboccacc 9y agoYeah but the faster they go the more inertia the whole thing has to handle for those safety mechanism, right? And the added machinery weight impacts on the elevator loading as well.
- jjoonathan 9y agoYes, but there are ways of dealing with inertia. Like making the door lighter and putting padding on the contact surfaces. It's not rocket science. Also, most of the improvement would come from replacing the worst offenders (5-10 second closing times) rather than from shaving 1 second times to 1/2 a second, and there's tons of precedent for the former from the faster-closing 10% or so of existing installations.
- londons_explore 9y agoA sensor to detect a clear doorway is straightforward. Doors that have sensitive rubber edges that can detect hitting something and engage a lock within milliseconds are also trivial. The two methods combined mean that you have safety for soft human fleshy bits incase either malfunctions, yet the door can still be moving at 15 mph or more and close in 100 milliseconds.
- mdpopescu 9y agoYou're not thinking in defensive mode. What happens when the sensor fails?