Oscillating cut-off saw

Claim 1

A power saw comprising: a stationary bed having four upright posts, two of which are disposed at the two rear corners of a rectangle and the other two at the forward corners; a pair of parallel and horizontal disposed rods, each of which is mounted by its ends near the top of two of said posts so that said rods extend fore and aft; a relatively narrow frame having a top edge and a pair of opposing and alligned beams extending outwardly from said frame at said top edge thereof; a pair of bearing means, each of which is fixed to one of said beams and make sliding 360° bearing contact around and with a respective one of said rods so that said frame depends from and between said rods; a horizontally disposed axle mounted on the top edge of said frame and disposed perpendicularly to said rods; a boom mounted on and disposed to rotate about said axle so that one end of said boom extends forward of said axle and the other end extends rearwardly of said axle; a rotatable saw, rotatably mounted on the forward end of said boom; a motor mounted on the rear end of said boom and having means for coupling energy to said saw to rotate said saw; a first fluid piston and cylinder assembly, horizontally disposed and having one end directly engaging said frame and the other end fixed to said stationary bed for moving said frame along said rods; and a second fluid piston and cylinder assembly having one end coupled to said boom and the other end coupled to said frame near the lowest portion thereof for maximum vertical movement of said saw by maximum stroke of said second assembly.