A blade tensioner comprising a blade shoe with a proximal end pivotally
attached to the bracket and a distal end of a clevis shape having a
raised portion and a recessed portion for receiving a semicircular
ratchet wheel, with an edge of the raised portion defined by a radial
journal in between a pair of shoulders. The ratchet wheel is pivotally
attached to the recessed portion of the distal end of the blade shoe
having a plurality of ratchet teeth, a pair of shoulders, and a reduced
diameter portion forming a bearing surface with the radial journal of the
raised portion of the distal end. A ramp surface having a plurality of
ramp teeth that receives the ratchet teeth of the ratchet wheel and
allows freedom of movement in the direction of the pivot pin, but limits
movement in the opposite direction to the designated backlash.