Oh, is that why when you "overwound" it it would make that rapid ticking sound? The outer end of the spring is falling into the next little slot, huh. Fascinating stuff.
How does a pull-back car work? Illustrated teardown
21–30 of 43 posts
Re: How does a pull-back car work? Illustrated teardown
#22What is the name for the sort of toy car you push in one direction and it continues slowly in that direction? These ones were usually styled as 4x4 vehicles and almost moved like a rock crawler with the 4wd set to low. They could be pushed forward or in reverse (and then would go in reverse).
Are you talking about https://en.wikipedia.org/wiki/Friction_motor ?
That's it.
Re: How does a pull-back car work? Illustrated teardown
#23I guess as a kid I only had access to the cheap ones? Would pull back, not knowing where to stop, and there was eventually a crunching noise. Then I'd worry I'd ruined the thing!
The "mystery" posed at the end of the OP suggests that that crunching noise was the action of the built-in strain relief within the spring enclosure.
Re: How does a pull-back car work? Illustrated teardown
#24This really needs to be done for a GLP-1 auto injecting needle. Pretty sure it’s the same as an epi-pen as well. It blows my mind. It’s a disposable, single use device that at the press of button: 1. Inserts the needle in your skin, 2. Slowly presses the plunger until the dose is injected 3. Then retracts the needle with plunger Three distinct and seemingly opposing motions. With timing. All in a little plastic enclo…
There's an even fancier mechanism with e.g. glucagon pens, where it actually has to rehydrate the freeze dried hormone (glucagon forms aggregations when it sits, has to be mixed fresh)
Actually, after looking into it recently, this is actually not true any more. All the current glucagon delivery mechanisms are either dry powder or DMSO-based, so no actual water involved, and are premixed and ready to go basically the same as epipen style autoinjectors
I'm excited for the advent of dasiglucagon which is a non-clumping peptide designed for the purpose.
Re: How does a pull-back car work? Illustrated teardown
#25Great site!
Re: How does a pull-back car work? Illustrated teardown
#26absolutely love it! Gorgeous drawing, meticulous detail.
Re: How does a pull-back car work? Illustrated teardown
#27Why is the wind-up gear needed? Couldn't the axle be connected directly to the spring gear?
Re: How does a pull-back car work? Illustrated teardown
#28Please leave my browser history alone
what does this mean ? whats the context ?
Re: How does a pull-back car work? Illustrated teardown
#29This really needs to be done for a GLP-1 auto injecting needle. Pretty sure it’s the same as an epi-pen as well. It blows my mind. It’s a disposable, single use device that at the press of button: 1. Inserts the needle in your skin, 2. Slowly presses the plunger until the dose is injected 3. Then retracts the needle with plunger Three distinct and seemingly opposing motions. With timing. All in a little plastic enclo…
Check out this video from Steve Mould; I think it covers exactly what you're looking for! https://youtu.be/CfhsW1kaa2Q?is=ug5_Ze2HczVMGTMR
Untracked link: https://www.youtube.com/watch?v=CfhsW1kaa2Q
(It's a really good video btw!)
Re: How does a pull-back car work? Illustrated teardown
#30We had these for my boys. The target age range of someone who can have fun with these ends at about the same age you learn to be careful enough not to break the motor.