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Traditional pump car lever mechanism Answered

Does anyone know how the lever mechanism of a traditional pump car work? I'm thinking of building a miniature model but I can't find any design schematics for it. Thank you.

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NachoMahma (author)2007-10-08

. I think what you are talking about (manual railroad "truck"), uses a rod from the "see-saw" to an offset on the axle. Kinda like a one-cylinder car engine, with the see-saw replacing the piston. A "real" one may have a transmission, &c;, but that's the basic principle.

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GerryA16 (author)NachoMahma2018-01-25

The "see-saw" rocker arm has a rod that goes down to a cranked axle that has a large gear wheel. It meshes with a smaller gear that turns the axle. The drive wheels turn faster than the gear that the "see-saw" is connected to.

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gyromild (author)NachoMahma2007-10-08

And a clutch mechanism if I'm not mistaken

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pinoymale (author)2007-10-22

Thank you to everyone who responded, I'm continuing my online research and hope to build my own handcar/pump car real soon!

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Goodhart (author)pinoymale2007-10-23

This Miller's ratchet is one way to drive a flywheel, and if you had a centrifugal shifting mechanism, it would be easier to start in a "lower gear" to get it started.

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NachoMahma (author)pinoymale2007-10-23
. That should make a very interesting iBle.

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Goodhart (author)Kiteman2007-10-08

That's great, I was always curious as to how they worked.

Oh, and I simply loved this line from your Link:

Here is a close up view of the brake rigging. It is very simple and made up of about 60 pieces.

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trebuchet03 (author)Goodhart2007-10-08

It is very simple and made up of about 60 pieces.

That looks like it's counting fasteners ;) I mean, if you have 4 bolts, with two washers a nut and a jamb nut each -- that's 20 pieces right there :p

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Goodhart (author)trebuchet032007-10-08

Ok, but if they meant =60 major pieces= we are looking at something a wee bit more complex then I care to tackle, considering that is only the brake. :-)

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chooseausername (author)Kiteman2007-10-08

Wow ... Thanks Kiteman (and Pinoymale) ! I've been looking for the name of this machine for years ... (and I don't even remember why, now). So, this thing is called "Handcar" (US), or "pump trolley" (UK) ... Now, I just need to find how it's called in my language ...

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(Ok, I think it's called "Draisine" in my language)

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