Apparatus for screening and trowelling concrete
OwnerJoel D. Hansen, Meloy F. Hanseninventors
Life of this patent
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Abstract
Disclosed is an apparatus for screeding or trowelling concrete or similar materials. The apparatus has a turret, mounted on a mobile frame. A telescopic boom is mounted in cantilevered fashion on the turret. A machine head, mounted on the distal end of the boom, is rotatable about a vertical axis. An attachment, such as a screed or a trowel, is attached to the machine head. The level and angle of the frame can be set to a selected elevation relative to a rotating laser beam by raising or lowering three hydraulic legs. The machine head can raise or lower the attachment to set the attachment at a selected elevation.
Claims16
An apparatus for screeding concrete, comprising;
- a frame;
- a turret mounted on the frame for rotation about a vertical axis;
- a telescopic boom mounted in cantilevered fashion on the turret;
- a machine head mounted on the end of the boom, the machine head being rotatable about a vertical axis;
- and
- a screed attachment connected to the machine head for screeding the concrete.
An apparatus for screeding concrete, comprising:
- a frame;
- a turret mounted on the frame for rotation about a vertical axis;
- a telescopic boom mounted in cantilevered fashion on the turret;
- a machine head mounted on one end of the boom, the machine head being rotatable about a vertical axis;
- a screed attachment connected to the machine head for screeding the concrete;
- three nonlinear adjustable legs for supporting the frame;
- a laser receiver for sensing the elevation of a laser beam periodically moving in a horizontal plane;
- adjustment means responsive to the laser receiver for adjusting the elevation of the screed attachment to a predetermined relationship to the plane of the laser beam;
- leveling means for leveling the frame, including a pair of inclinometers mounted on the frame in order to sense the level of the frame along two perpendicular lines;
- and
- propulsion means for moving the frame over a support surface.
An apparatus for trowelling concrete, comprising:
- a frame;
- a turret mounted on the frame for rotation about a vertical axis;
- a telescopic boom mounted in cantilevered fashion on the turret;
- a machine head mounted on the end of the boom, the machine head being rotatable about a vertical axis;
- and
- a trowel connected to the machine head for trowelling the concrete.
Dependencies are inferred from the claim text.