📜 ⬆️ ⬇️

Bonded forever

An ordinary day, you go to the workplace, thinking about something good - for example, a promising gadget like a seventh iPhone or an electric bicycle . Suddenly you see on the floor ...

No, not a new low-power microprocessor, but a screw ... suspiciously large image

What is it? In the office settled fastening fairy? Do your colleagues lack iron? Will the bugs equip a gym to prepare for a rebellion?

No, it started to fall apart chairs. The organization buys chairs for unfunny money, they look normal, they sit on them normally, but after six months or a year, screws begin to fall down in a hail of hail, and the chairs turn into a designer.

Common situation? Want to talk about it? What can be done?

You can try to buy chairs Herman Miller ( trolls all very sooo love to talk about it, but for some reason usually sour when they find out how much it will cost) or use time-tested technology (effectively and much cheaper).

First of all, why everyone urgently needs to switch to Linux, they fall apart.

As long as the chair is new, the screws look tight. Often they are actually well tightened. Then you start using the chair - sit down, stand up, sit down, stand up (mentally uncapable, multiply it by six months or a year of typical working days). Sit you not motionless - often move the center of gravity a little.

As a result, different parts of the chair elastically bend and unbend hundreds and thousands of times, and at the same time the load on them is considerable. When any part is bent, there is a lot of effort on the screws passing through it. Repeating hundreds and thousands of times, such efforts gradually lead to the unscrewing of the screw.

It looks ridiculous, but it is a fact - even when the screw is well tightened, its resistance to reversing is not enough. You can tighten all the screws even for a very big moment (for this purpose it is customary to use a larger screwdriver), but after some time the tightening will inevitably loosen and the screws will begin to turn away again.

FAIL? In the 21st century, when a finger-sized microcircuit can contain millions of transistors, it is impossible to assemble a chair so that it does not understand itself?


Of course, the first thing that comes to mind is to use glue. Something like this:

FAIL on this path, because after that it is impossible to unscrew the screws. And you may want to disassemble the chairs, for example, it is more convenient to transport them. So forget about glue right away.

The second attempt. We need a method that would allow to turn the screws and screw them back at any time, but in which the screws would not turn out themselves. Something contradictory and paradoxical.

Will help the next discovery of British scientists. They recently found a curious document in the Alexandrian Library - DIN 127B. The text of DIN 127B, apparently, was considered irretrievably lost - otherwise it would be impossible to explain the deplorable situation with the assembly of chairs.

DIN 127B - the standard for one of the varieties of spring washers.

Application scheme:

In the place of the cut, the spring washer rests against the part and into the screw, and this significantly increases the resistance to loosening. Now they are inseparable, but the connections remain collapsible.

In some cases, when the surface of the part or the edges of the hole are uneven, the spring washer will fall. Then you need to put the usual flat washer first, and the spring one on top.

Successes to you with high technologies!

Dmitry Mescheryakov
Department of Data Entry Products

Source: https://habr.com/ru/post/105770/

All Articles