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Commercially Available Valve Stem Mounted Puncture Alarm



 
 
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  #1  
Old November 2nd 18, 05:30 PM posted to uk.rec.cycling
Bret Cahill
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Posts: 875
Default Commercially Available Valve Stem Mounted Puncture Alarm

https://www.dcrainmaker.com/2018/04/...re-sensor.html

It's assumed the cyclist pretty much knows what the pressure is at the beginning of a ride, and, if no punctures, that shouldn't be much more than 40 kPA different than at the end of the day.

So the only interesting event that needs to be monitored is a rapid pressure drop indicating a puncture.

What cyclists really need is real time ( 3 seconds) smoke detector like piezoelectric shriek when the pressure drops, say, 20 kPa over 3 seconds.

It's only necessary to determine the time rate of change in pressure to alert the cyclist he has just run over a thorn. A button battery powered sensor that detects rapid changes in air pressure should be at least as cheap as one that monitors pressure itself.

A fancier version could have 3 different pitches for 3 different leak rates, high for 40 kPa / 2 sec, medium for 20 kPa/3 sec and low for 7 kPa / 3 seconds.

Then the cyclist has a clue as to how long it'll be before he's on the rims..

Is anything like this commercially available? On a production basis it shouldn't cost much more than a $5 smoke detector.


Bret Cahill



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  #2  
Old November 2nd 18, 09:01 PM posted to uk.rec.cycling
Mr Pounder Esquire
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Posts: 2,896
Default Commercially Available Valve Stem Mounted Puncture Alarm

Bret Cahill wrote:
https://www.dcrainmaker.com/2018/04/...re-sensor.html

It's assumed the cyclist pretty much knows what the pressure is at
the beginning of a ride, and, if no punctures, that shouldn't be much
more than 40 kPA different than at the end of the day.

So the only interesting event that needs to be monitored is a rapid
pressure drop indicating a puncture.

What cyclists really need is real time ( 3 seconds) smoke detector
like piezoelectric shriek when the pressure drops, say, 20 kPa over 3
seconds.

It's only necessary to determine the time rate of change in pressure
to alert the cyclist he has just run over a thorn. A button battery
powered sensor that detects rapid changes in air pressure should be
at least as cheap as one that monitors pressure itself.

A fancier version could have 3 different pitches for 3 different leak
rates, high for 40 kPa / 2 sec, medium for 20 kPa/3 sec and low for
7 kPa / 3 seconds.

Then the cyclist has a clue as to how long it'll be before he's on
the rims.

Is anything like this commercially available? On a production basis
it shouldn't cost much more than a $5 smoke detector.


Bret Cahill


I could almost feel sorry for you.
But I don't.


  #3  
Old November 3rd 18, 12:29 AM posted to uk.rec.cycling
JNugent[_10_]
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Posts: 350
Default Commercially Available Valve Stem Mounted Puncture Alarm

On 02/11/2018 16:30, Bret Cahill wrote:
https://www.dcrainmaker.com/2018/04/...re-sensor.html

It's assumed the cyclist pretty much knows what the pressure is at the beginning of a ride, and, if no punctures, that shouldn't be much more than 40 kPA different than at the end of the day.

So the only interesting event that needs to be monitored is a rapid pressure drop indicating a puncture.

What cyclists really need is real time ( 3 seconds) smoke detector like piezoelectric shriek when the pressure drops, say, 20 kPa over 3 seconds.

It's only necessary to determine the time rate of change in pressure to alert the cyclist he has just run over a thorn. A button battery powered sensor that detects rapid changes in air pressure should be at least as cheap as one that monitors pressure itself.

A fancier version could have 3 different pitches for 3 different leak rates, high for 40 kPa / 2 sec, medium for 20 kPa/3 sec and low for 7 kPa / 3 seconds.

Then the cyclist has a clue as to how long it'll be before he's on the rims.

Is anything like this commercially available? On a production basis it shouldn't cost much more than a $5 smoke detector.


Bret Cahill


BMW cars (and other makes such as Toyota, Pontiac and Cadillac) do this.

Why not just buy a bike made by one (or more) of those?
  #4  
Old November 3rd 18, 07:56 AM posted to uk.rec.cycling
MrCheerful
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Posts: 4,757
Default Commercially Available Valve Stem Mounted Puncture Alarm

On 02/11/2018 23:29, JNugent wrote:
On 02/11/2018 16:30, Bret Cahill wrote:
https://www.dcrainmaker.com/2018/04/...re-sensor.html


It's assumed the cyclist pretty much knows what the pressure is at the
beginning of a ride, and, if no punctures, that shouldn't be much more
than 40 kPA different than at the end of the day.

So the only interesting event that needs to be monitored is a rapid
pressure drop indicating a puncture.

What cyclists really need is real time ( 3 seconds) smoke detector
like piezoelectric shriek when the pressure drops, say, 20 kPa over 3
seconds.

It's only necessary to determine the time rate of change in pressure
to alert the cyclist he has just run over a thorn.Â* A button battery
powered sensor that detects rapid changes in air pressure should be at
least as cheap as one that monitors pressure itself.

A fancier version could have 3 different pitches for 3 different leak
rates, high for 40 kPa / 2 sec, medium for 20 kPa/3 sec and low for
7 kPa / 3 seconds.

Then the cyclist has a clue as to how long it'll be before he's on the
rims.

Is anything like this commercially available?Â* On a production basis
it shouldn't cost much more than a $5 smoke detector.


Bret Cahill


BMW cars (and other makes such as Toyota, Pontiac and Cadillac) do this.

Why not just buy a bike made by one (or more) of those?


all recent cars must have tyre pressure monitoring, it is a legal
requirement now.

Many bicycles use car size valves, it is easy to buy a set of valve caps
to fit car size valves that transmit the tyre pressure to a little
monitor screen, this has been available for many years and is especially
really useful for trailers and caravans (where you would not so easily
notice low pressure symptoms from driving feel.
  #5  
Old November 3rd 18, 12:29 PM posted to uk.rec.cycling
JNugent[_10_]
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Posts: 350
Default Commercially Available Valve Stem Mounted Puncture Alarm

On 03/11/2018 06:56, MrCheerful wrote:
On 02/11/2018 23:29, JNugent wrote:
On 02/11/2018 16:30, Bret Cahill wrote:
https://www.dcrainmaker.com/2018/04/...re-sensor.html


It's assumed the cyclist pretty much knows what the pressure is at
the beginning of a ride, and, if no punctures, that shouldn't be much
more than 40 kPA different than at the end of the day.

So the only interesting event that needs to be monitored is a rapid
pressure drop indicating a puncture.

What cyclists really need is real time ( 3 seconds) smoke detector
like piezoelectric shriek when the pressure drops, say, 20 kPa over 3
seconds.

It's only necessary to determine the time rate of change in pressure
to alert the cyclist he has just run over a thorn.Â* A button battery
powered sensor that detects rapid changes in air pressure should be
at least as cheap as one that monitors pressure itself.

A fancier version could have 3 different pitches for 3 different leak
rates, high for 40 kPa / 2 sec, medium for 20 kPa/3 sec and low for
7 kPa / 3 seconds.

Then the cyclist has a clue as to how long it'll be before he's on
the rims.

Is anything like this commercially available?Â* On a production basis
it shouldn't cost much more than a $5 smoke detector.


Bret Cahill


BMW cars (and other makes such as Toyota, Pontiac and Cadillac) do this.

Why not just buy a bike made by one (or more) of those?


all recent cars must have tyre pressure monitoring, it is a legal
requirement now.


I didn't know that, but it makes sense.

Many bicycles use car size valves, it is easy to buy a set of valve caps
to fit car size valves that transmit the tyre pressure to a little
monitor screen, this has been available for many years and is especially
really useful for trailers and caravans (where you would not so easily
notice low pressure symptoms from driving feel.


Sounds like a good idea. And it would provide an opportunity for
ostenatious display of the cyclist's affluence. After all, they're all
Considerably Richer Than Yow.

Talking of which, here's a typical ukrc cyclist:
https://www.youtube.com/watch?v=U8Kum8OUTuk



  #6  
Old November 3rd 18, 01:35 PM posted to uk.rec.cycling
TMS320
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Posts: 3,875
Default Commercially Available Valve Stem Mounted Puncture Alarm

On 02/11/2018 16:30, Bret Cahill wrote:

What cyclists really need...


I really don't think I do.

... is real time ( 3 seconds) smoke detector like piezoelectric
shriek when the pressure drops, say, 20 kPa over 3 seconds.


Or - notice the bike is handling strangely. And shout "oh bugger" inside
your head.

My guess is that the device shown only does a check every few hours or
days so replaces routine checking - put weight on bar and frame; do the
sidewalls bulge? Your fast response adds complication.
  #7  
Old November 3rd 18, 06:33 PM posted to uk.rec.cycling
Bret Cahill
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Posts: 875
Default Commercially Available Valve Stem Mounted Puncture Alarm

Or - notice the bike is handling strangely.

Do a video of a cyclist detecting a 20 kPa drop in pressure w/o a pressure transducer.

You can post the link to this thread!



  #8  
Old November 3rd 18, 06:38 PM posted to uk.rec.cycling
Bret Cahill
external usenet poster
 
Posts: 875
Default Commercially Available Valve Stem Mounted Puncture Alarm

https://www.dcrainmaker.com/2018/04/...re-sensor.html


It's assumed the cyclist pretty much knows what the pressure is at the
beginning of a ride, and, if no punctures, that shouldn't be much more
than 40 kPA different than at the end of the day.

So the only interesting event that needs to be monitored is a rapid
pressure drop indicating a puncture.

What cyclists really need is real time ( 3 seconds) smoke detector
like piezoelectric shriek when the pressure drops, say, 20 kPa over 3
seconds.

It's only necessary to determine the time rate of change in pressure
to alert the cyclist he has just run over a thorn.Â* A button battery
powered sensor that detects rapid changes in air pressure should be at
least as cheap as one that monitors pressure itself.

A fancier version could have 3 different pitches for 3 different leak
rates, high for 40 kPa / 2 sec, medium for 20 kPa/3 sec and low for
7 kPa / 3 seconds.

Then the cyclist has a clue as to how long it'll be before he's on the
rims.

Is anything like this commercially available?Â* On a production basis
it shouldn't cost much more than a $5 smoke detector.


Bret Cahill


BMW cars (and other makes such as Toyota, Pontiac and Cadillac) do this..

Why not just buy a bike made by one (or more) of those?


all recent cars must have tyre pressure monitoring, it is a legal
requirement now.

Many bicycles use car size valves, it is easy to buy a set of valve caps
to fit car size valves that transmit the tyre pressure to a little
monitor screen


Why waste time looking at a screen when a piezoelectric shriek is faster, smaller, easier, cheaper, more durable and more reliable?


Bret Cahill

  #9  
Old November 4th 18, 01:37 AM posted to uk.rec.cycling
TMS320
external usenet poster
 
Posts: 3,875
Default Commercially Available Valve Stem Mounted Puncture Alarm

On 03/11/2018 17:33, Bret Cahill wrote:

Or - notice the bike is handling strangely.


Do a video of a cyclist detecting a 20 kPa drop in pressure w/o a
pressure transducer.


If the cyclist can't detect a pressure drop, it's not a pressure drop of
any importance.
  #10  
Old November 4th 18, 04:40 AM posted to uk.rec.cycling
Bret Cahill
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Posts: 875
Default Commercially Available Valve Stem Mounted Puncture Alarm

Or - notice the bike is handling strangely.

Do a video of a cyclist detecting a 20 kPa drop in pressure w/o a
pressure transducer.


If the cyclist can't detect a pressure drop, it's not a pressure drop of
any importance.


Unless it takes place over 3 seconds.

Most cyclists like early warning.


 




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