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A portable rotary power saw comprising a housing having mounted at its aft end a pair of rear wheels and a handlebar assembly. Mounted at the fore end of the housing a rotary cutting blade and a vertically adjustable axle having a pair of front wheels. Located between the rear and front wheels withi

A portable rotary power saw comprising a housing having mounted at its aft end a pair of rear wheels and a handlebar assembly. Mounted at the fore end of the housing a rotary cutting blade and a vertically adjustable axle having a pair of front wheels. Located between the rear and front wheels within the housing is a stationary axle mounted upon a pair of bearings which permit the axle to pivot. The saw includes a height adjustment mechanism comprising a segment, a latch, and a cable and lever assembly for operating the latch. One leg of the segment is supported by the stationary axle and connected to the adjustable axle by a pair of arms. The other leg of the segment includes a plurality of notches spaced along its length and it extends through the top of the housing. The latch is located on top of the housing immediately adjacent the notched leg and is capable of pivoting in and out of engagement with the notches. The segment is biased such that when a user squeezes the lver and exerts a vertically downward force upon the handlebar assembly, the adjustable axle extends vertically downward relative to the housing. Alternatively, when the user discontinues squeezing the lever, the latch engages one of the notches of the segment thereby locking the segment and the adjustable axle into a predetermined position.

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A portable rotary power saw for cutting a groove into concrete, asphalt or similar surfaces comprising a housing having a fore end and an aft end, said housing at its aft end having one or more rear wheels supporting said aft end upon such surface and a handlebar assembly extending vertically upward

A portable rotary power saw for cutting a groove into concrete, asphalt or similar surfaces comprising a housing having a fore end and an aft end, said housing at its aft end having one or more rear wheels supporting said aft end upon such surface and a handlebar assembly extending vertically upward therefrom, said housing at its fore end supporting a rotary cutting blade, a vertically adjustable axle in the proximity of said fore end including one or more front wheels, a stationary axle mounted on said housing between said aft end and said fore end, said adjustable axle being supported by said stationary axle, and adjustment means for adjusting the position of said adjustable axle relative to said housing and in turn the vertical height of said fore end of said housing and thus the cutting depth of said blade, said adjustment means comprising a segment, a latch, and actuation means for operating said latch, said segment having a first leg supported by said stationary axle and a second leg having a plurality of notches spaced along its length and extending through the top of said housing, said latch being located immediately adjacent said notched second leg and being capable of pivoting in and out of engagement with said notches, said segment being connected to said adjustable axle and being biased by a biasing means such that when a user activates said actuation means and exerts a vertically downward force upon said handlebar assembly causing said housing to pivot upon said rear wheels said adjustable axle extends vertically downward relative to said housing and when said user discontinues activating said actuation means said latch engages one of said notches of said second leg of said segment thereby locking said segment and said adjustable axle into a predetermined position.