Crank-driven tire pump

Rollodo · Apr 4, 2012

This is something I came across a few days ago, I've never seen of heard of anything like this. It's a tire pump driven by a rotary backward motion of the bicycle crank. If you know the guy in the video or anything about the pump (maybe you've seen it before), please post back.

[youtube]GxvpD33AMxQ[/youtube]

If this proves to be a feasible concept and somebody here at ES could manufacture this, I for one would be very pleased and would possibly buy a couple.

TylerDurden · Apr 4, 2012

That's fairly clever. I rekon folks can DIY one of those by cannibalizing a 12V inflator.

ohzee · Apr 4, 2012

looks pretty interesting - still it's easy enough for me to pump air id find no need for the added complexity

Rollodo · Apr 4, 2012

I searched through ES and couldn't find much of relevant info. Because I'm not that technically-inclined, if anyone knows how to make one by "cannibalizing a 12V inflator", please post some info.

TylerDurden · Apr 4, 2012

Here is a large image of the internals:
http://4.bp.blogspot.com/_CVW_rwnR2Zw/TB_2B9ePSoI/AAAAAAAAFHs/Itzbxkw1rEo/s1600/Tyre+inflator+and+digital+gauge.jpg

In a nutshell:
The small 12V motor spins a crank driving the piston up and down. Replace the motor with a sprocket and make a bracket to attach the assembly to the bike.

The devil is in the details, so kudos to the guy who did it.

Kingfish · Apr 4, 2012

Looks more compact than the traditional hand pump. Bet the weight isn’t that different. Beats building a new muscle if you’ve got one of those 2.5” phatty tires. Then again, the 12V original keeps it simple (and I have 12V available through my DC-DC converter).

Thanks for posting, KF

Ypedal · Apr 4, 2012

ha.. clever.

Should have plenty of leverage too for good psi..

gogo · Apr 4, 2012

Heh, ya, I hook my 12V up to my drill battery and noticed it works in either polarity, so can be spun in either direction. Clever indeed.

dumbass · Apr 4, 2012

It is clever but the only time I'm going to use a hand pump is if I have a flat while riding. And I would much rather deal with a hand pump then play with a greasy chain to install that thing. However, if it had a freewheel on it so it could be perminantly mounted then I'd like it.

Bob

Rollodo · Apr 4, 2012

dumbass said:
It is clever but the only time I'm going to use a hand pump is if I have a flat while riding. And I would much rather deal with a hand pump then play with a greasy chain to install that thing. However, if it had a freewheel on it so it could be perminantly mounted then I'd like it.

Bob

I'm sure there would be a way to permanently mount it, IF there was one made. I'd actually rather rotate the crank than trying to press on that pump over and over and over again until I need a shot of Red Bull to keep me going.

cal3thousand · Apr 4, 2012

Integrate that into the bike itself somehow and you have a winner. Until then, I'll keep my hands clean and use a hand pump. A rigid hand pump is also easier to transport on a bike than that doohickey.

Dee Jay · Apr 4, 2012

we've had those here in Japan on some premium mother's bikes for a long time now, don't know how it works tho

Joseph C. · Apr 4, 2012

The hose needs to be longer. Its ability to reach the front wheel seems very tight.

If it can't reach carrying two pumps completely defeats the purpose.

gogo · Apr 4, 2012

Joseph C. said:
The hose needs to be longer. Its ability to reach the front wheel seems very tight.

If it can't reach carrying two pumps completely defeats the purpose.

The back wheel had quick release…

Joseph C. · Apr 4, 2012

gogo said:
Joseph C. said:

The hose needs to be longer. Its ability to reach the front wheel seems very tight.

If it can't reach carrying two pumps completely defeats the purpose.

Click to expand...

The back wheel had quick release…

Yes but it looks like it is designed to work only from the back wheel. It's not functional if you remove it from the chain.

TylerDurden · Apr 4, 2012

Joseph C. said:
Yes but it looks like it is designed to work only from the back wheel. It's not functional if you remove it from the chain.

It might be possible to remove the front wheel and place it next to the pump by the back wheel. :wink:

Joseph C. · Apr 4, 2012

TylerDurden said:
Joseph C. said:

Yes but it looks like it is designed to work only from the back wheel. It's not functional if you remove it from the chain.

Click to expand...

It might be possible to remove the front wheel and place it next to the pump by the back wheel. :wink:

amberwolf · Apr 5, 2012

I really like the basic idea, and if I were still riding unpowered bikes I'd probably look into doing it.

But since I have a battery on my bike, I'd rather just do what I now do: carry a 12V automotive pump.

Though I used to carry a footpump: it's hose came off and I decided I'd had it with that kind of thing happening. I previously used a bicycle handpump by Bell, whcih while by itself it works well, I can't hold it strongly enough to keep it from flexing the valve stems, and it caused a number of tube failures (or exacerbated existing failures in the stems). So I don't use it anymore, except sometimes on tubes that are not installed in rims yet, and sometimes to air up other things that don't have the risk of cutting into the valve stem.

Crank-driven tire pump

Rollodo

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