Reply by RobynHoodridge

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Posted on Shaving Giraffe - a shave horse re-design from Africa

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127 posts in 2296 days

#1 posted 02-10-2013 01:43 AM

Hi everybody. I’ve made a full scale version. If you’d like to have a look, here’s a link to my LumberJocks blog entry about it:

@GEOwen: Now you’re really thinking! I love it.
You’re right about not needing a tonne of clamping pressure. However…. Having made one, i can tell you that the clamping pressure isn’t immense the way you might fear. The user’s body weight is far back, towards the legs or whatever rear support there is. This rear support point is actually acting as a pivot point for applying the force of teh weight, so we can speak about it as torque. And from what we know about torque, the length ot the lever is important. So a seating position far back lessens the effect of a full body weight on the bench. The angle of the swing-arm also reduces the force applied. Let’s say it’s at 30 degrees – then we’re already at only 2/3 of the full downward force being converted into clamping pressure.
Your sprung seating idea sounds like so many of mine – perfect for some ultimate version of the Giraffe, but probably not something that folks will do. Of course one could take the Giraffe’s principle in any direction, but the way i’ve gone with it is the most simple. Sourcing springs takes it quite a leap from simply some rafters, pipe, board, cable and castors. With the right foot operated lever acting on a cable under the bench as in my firstborn, it’s also not difficult to open the jaws against the forces created by weight.
At the moment i’m crazy about suspending things. My desk is suspended from the ceiling, so no legs beneath the tabletop to bump into etc.. And i’m now imagining at least one end of the Giraffe strung up on cables from the roof. And perhaps with springs involved to ‘dampen’ harsh seating etc. :)

-- Never is longer than forever.

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