How Secure is an Automatic Hair Comb in Your Pocket?

  • Thread starter Thread starter goldliger
  • Start date Start date
  • Tags Tags
    Automatic Hair
AI Thread Summary
The discussion centers on the security of an OTF (out the front) automatic hair comb that utilizes a magnetic force of 1 lb, 12 oz. to keep the comb blade retracted. The user is concerned about the potential for accidental ejection while carrying the comb in a pocket, particularly given that the comb is designed to tip downward. Initial tests, including jumping and shaking, have not triggered the comb, but the user seeks further insights into the necessary force or acceleration that could lead to accidental activation. A calculation suggests that 28 ounces of force, equivalent to 28 times the force of gravity, would be required for ejection. The inquiry invites mathematical or engineering advice to assess the comb's safety in everyday use.
goldliger
Messages
3
Reaction score
1
Hey guys!

I've got an OTF comb (a.k.a. "out the front," where the plastic hair comb "blade" ejects straight out from the handle) that is held in the closed position with 1 lb, 12 ounces of magnetic force. I.e, upon measuring it takes 1 lb, 12 oz. of finger pressure against the comb switch to eject the comb *automatically*. The plastic comb "blade" itself weighs 1 oz.

Basically, I'm wondering how one would go about determining whether this is a reasonably secure configuration -- and by "secure" I mean - what would it take to have the comb eject from the handle accidentally while being carried in the pocket) considering the plastic comb "blade" will be carried in the pocket and generally tip pointed down (within the handle, of course). I've done rudimentary testing such as jumping up and down, stomping, shaking my pockets, etc, with this automatic comb in my pocket - pretty much everything short of jumping off a 100 foot cliff with rock slab at the bottom...

Any ideas, mathematical formulas, etc, are most welcome, and thanks for your time!
 
Engineering news on Phys.org
Since it takes 16+12= 28oz of force to eject the 1oz blade it would require an acceleration of 28 gees (28 times gravity). This is the impact acceleration required to set off an airbag...
 
goldliger said:
Hey guys!

I've got an OTF comb (a.k.a. "out the front," where the plastic hair comb "blade" ejects straight out from the handle) that is held in the closed position with 1 lb, 12 ounces of magnetic force. I.e, upon measuring it takes 1 lb, 12 oz. of finger pressure against the comb switch to eject the comb *automatically*. The plastic comb "blade" itself weighs 1 oz.

Basically, I'm wondering how one would go about determining whether this is a reasonably secure configuration -- and by "secure" I mean - what would it take to have the comb eject from the handle accidentally while being carried in the pocket) considering the plastic comb "blade" will be carried in the pocket and generally tip pointed down (within the handle, of course). I've done rudimentary testing such as jumping up and down, stomping, shaking my pockets, etc, with this automatic comb in my pocket - pretty much everything short of jumping off a 100 foot cliff with rock slab at the bottom...

Any ideas, mathematical formulas, etc, are most welcome, and thanks for your time!
This is reposting a locked thread, and very dishonest. Thread is closed. Check your messages.
 
Here's a video by “driving 4 answers” who seems to me to be well versed on the details of Internal Combustion engines. The video does cover something that's a bit shrouded in 'conspiracy theory', and he touches on that, but of course for phys.org, I'm only interested in the actual science involved. He analyzes the claim of achieving 100 mpg with a 427 cubic inch V8 1970 Ford Galaxy in 1977. Only the fuel supply system was modified. I was surprised that he feels the claim could have been...
Thread 'Turbocharging carbureted petrol 2 stroke engines'
Hi everyone, online I ve seen some images about 2 stroke carbureted turbo (motorcycle derivation engine). Now.. In the past in this forum some members spoke about turbocharging 2 stroke but not in sufficient detail. The intake and the exhaust are open at the same time and there are no valves like a 4 stroke. But if you search online you can find carbureted 2stroke turbo sled or the Am6 turbo. The question is: Is really possible turbocharge a 2 stroke carburated(NOT EFI)petrol engine and...
TL;DR Summary: Heard in the news about using sonar to locate the sub Hello : After the sinking of the ship near the Greek shores , carrying of alot of people , there was another accident that include 5 tourists and a submarine visiting the titanic , which went missing Some technical notes captured my attention, that there us few sonar devices are hearing sounds repeated every 30 seconds , but they are not able to locate the source Is it possible that the sound waves are reflecting from...

Similar threads

Back
Top