crank
lakat

crank
poluga

crank
ručica

crank
zglob

http://www.eudict.com/?lang=engcro&word=crank

bell crank - kolenasti zglob
bell crank - uglasta poluga
http://www.metak.com/

A bell crank is a type of crank that changes motion around a 90 degree angle. The name comes from its first use, changing the vertical pull on a rope to a horizontal pull on the striker of a bell, used for calling servants in upper class British households.
The bell crank consists of an "L" shaped crank pivoted where the two arms of the L meet. Moving rods (or ropes) are attached to the ends of the L arms. When one is pulled, the L rotates around the pivot point, pulling on the other arm.
http://en.wikipedia.org/wiki/Bell_crank