Mower construction

Claim 1

A sickle bar construction comprising an elongated support bar having upper and lower faces, front and rear faces and provided with stationary forwardly horizontally outwardly projecting guide supports spaced longitudinally along its front face and including forward coplanar upwardly facing bearing surfaces and upwardly opening and aligned transverse notches adjacent their rear base ends forming an elongated and upwardly opening guideway extending along the front face of said bar, a plurality of first upwardly offset and forwardly projecting upper cutter blades stationarily supported in cantilever manner from said bar and spaced longitudinally therealong, and an elongated mounting bar guidingly and reciprocally disposed in and projecting upwardly from said guideway, and a plurality of second forwardly projecting lower cutter blades secured to said mounting bar for reciprocation therewith and underlying and disposed in surface to surfacE sliding and shearing relation with the first cutter blades and also disposed in surface to surface sliding relation with said bearing surfaces, said support bar and said mounting bar including corresponding base and head ends, respectively, said head end of said mounting bar including a base plate portion including generally parallel opposite longitudinal side edges extending longitudinally thereof and a depending longitudinal ridge, said base end of said support bar including an upwardly opening and longitudinally extending wide and shallow recess in which said base plate portion is seated for guided reciprocal movement and also an elongated trough opening upwardly into the bottom of said recess in which said ridge is received for guided reciprocal movement, and a pair of guide plates supported from said base end of said support bar on opposite sides of said recess and projecting inwardly toward each other and overlying the opposite longitudinal side edge portions of said base plate portion.