초록 ▼

A motor powered rotary trowel employs a plurality of radially arranged trowel blades which can be adjustably tilted on their support arms in either direction and are mounted on a drive shaft which can be driven in either direction thereby enabling the weight of the trowel to be selectively supported

A motor powered rotary trowel employs a plurality of radially arranged trowel blades which can be adjustably tilted on their support arms in either direction and are mounted on a drive shaft which can be driven in either direction thereby enabling the weight of the trowel to be selectively supported on the edges on one side or the other of the trowel blades. In an alternative embodiment, selected parts of the trowel are arranged to fold to facilitate transport.

대표청구항 ▼

A concrete surface working apparatus comprising: (a) a frame structure; (b) a reversible, hydraulic motor mounted on said frame structure and having a vertical drive shaft; (c) a gasoline driven engine, a hydraulic pump driven by said engine and an associated oil reservoir and hydraulic control all

A concrete surface working apparatus comprising: (a) a frame structure; (b) a reversible, hydraulic motor mounted on said frame structure and having a vertical drive shaft; (c) a gasoline driven engine, a hydraulic pump driven by said engine and an associated oil reservoir and hydraulic control all mounted on said frame structure and providing means for energizing and controlling said motor enabling said shaft to be caused to stop or be selectively driven in either direction; (d) a plurality of radially arranged trowel blades having opposed parallel longitudinal working edges and tiltably mounted on support means arranged to be driven by said shaft, said motor, engine, hydraulic pump, oil reservoir and hydraulic control being mounted at elevated positions above said blades with said motor and shaft being above the center of said blades and with said engine and reservoir being disposed in a balanced relation on opposite sides of said motor; and (e) means mounted on said frame structure adapted for tilting the trowel blades in either direction about longitudinal axes and holding the blades on said support means in a selected tilted position whereby independent of the direction in which said shaft is driven the weight of said machine will be supported on and the finishing action of said blades will be accomplished by those edges of the blades which are trailing with respect to the direction of rotation of said shaft and blades.