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US 8,414,220 B1Granted
Apparatus for flattening floor
AssigneeJosei Techno Co., Ltd.
InventorYoshiyuki Koba
Life of this patent
Estimating the term…
Abstract
An apparatus for flattening a half-dry concrete floor includes a plurality of pressure rollers arranged such that axes of them are parallel with one another in an imaginary plane, a holder rotatably supporting the pressure rollers at opposite ends of the pressure rollers, an oscillation-transmitter formed integral with the holder for transmitting oscillation to the pressure rollers, and an oscillator for oscillating the oscillation-transmitter.
Claims17
An apparatus for flattening a half-dry concrete floor, the apparatus comprising:
- a plurality of pressure rollers arranged such that axes of said pressure rollers are parallel with one another in an imaginary plane;
- a holder rotatably supporting said pressure rollers at opposite ends of said pressure rollers;
- an oscillation-transmitter connected to said holder for transmitting oscillation to said pressure rollers;
- an oscillator for oscillating said oscillation-transmitter at a natural frequency of said oscillation-transmitter;
- and
- a planarizer including an elastically deformable plate, said planarizer slidably making contact with the floor, and being arranged behind said pressure rollers.
3 more elements
Dependencies are inferred from the claim text.