Introduction: Office Armchair
I foundan old armchairworkshop...
it was notin good condition andIheightadjustmentsystemwasbroken(threaded rod)
I was inspiredautomotivejacksforheightadjustmentsystem
I askedafriendto make mecustomgearsto have aperfect parallelogramwhateverheight
there is a screw-endlessof jacks andan oldcrank toraise the siege
the springsafterthescrews allowthe seatcushion
there arethrust ball bearing,for the screw andthe rotation
I deliberatelykeptas-istheseat and backrest
the oldseatofthefirstphotos will berestored later
itisto show youwhatstatewas theblackin thisInstructables
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