Road structure – process – or apparatus – Apparatus – With means for profile shaping – e.g. – crown
Patent
1994-07-28
1996-07-09
Buiz, Michael Powell
Road structure, process, or apparatus
Apparatus
With means for profile shaping, e.g., crown
404118, E01C 1922
Patent
active
055338305
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a machine for floating floors, that is to say, an assemblage of devices by means of which to effect an automatic smoothing action on extensive flat surfaces consisting in a layer of concrete or mortar, not yet fully dried; once hardened, such surfaces will provide floors in premises destined for industrial or commercial activity, for example, or in public or private buildings generally.
The prior of art comprises float finish machines comprising a rotor, or a pair of rotors each equipped with a set of adjustable radial trowel blades cantilevered from a crosswise supporting member driven in rotation about its own vertical axis by an engine and speed reducer.
The German document DE-A-2 502 902, for instance, discloses a float finish machine for floating floors, comprising a rotor consisting of a disk, disposed sustantially parallel to the floor, the disc being provided with radial slots each accommodating a trowel blade, each trowel blade being angularly adjustable about an axis disposed sustantially parallel to the floor, the disc being coupled with a shaft having its axis disposed substantially perpendicular to the floor. This document forms the basis for the preamble of the independent claim. One notable problem experienced with such machines is that of finishing the areas of the floor adjacent to the walls; this is due principally to the large outer diameter of the rotors, typically around one meter and even more, which dictates that the crosswise supporting member must maintain a stable horizontal position in order to ensure that its radial arms are protected from damaging vibrations and excessive shock loads. Such machines are therefore unsuitable for finishing the border areas of floors, albeit only slightly uneven or sloping, with the result that recourse must be made to the more costly operation of floating by hand.
It often happens, moreover, particularly with single rotor machines, that in an attempt to finish the border areas of a floor exhibiting a shallow depression, the operator will attempt to tilt the vertical axis of the rotor toward the wall; this results in excessive stress being placed on the arms of the crosswise supporting member and uneven wear on the mechanical components of the machine, not to mention damage to the areas of the wall against which the frame of the machine is caused to chafe.
The prior art thus stands in need of considerable improvement, in view of a possible elimination of the drawbacks mentioned above.
The object of the invention is to provide a float finish machine for floating floors of cement mortar or other suitable cement compound for industrial premises and public or private buildings, which is not affected by vibrations and/or heavy mechanical stresses on the rotor assembly and is suitable in particular for finishing the borders of a floor, even when the floor exhibits slightly concave or sloping areas; moreover, such a machine should not cause damages to the walls during operation and must also be functional, efficient and inexpensive.
The float finish machine according to the invention comprises a rotor consisting of a disk, disposed sustantially parallel to the floor, the disc being provided with radial slots each accommodating a trowel blade, each trowel blade being angularly adjustable about an axis disposed sustantially parallel to the floor, the disc being coupled with a shaft having its axis disposed substantially perpendicular to the floor wherein an idle spacing element having an outer diameter greater than the outer diameter of the disk is disposed on the shaft.
The profile of each radial slot is advantageously rectangular with the longer sides parallel to a radial direction; the respective trowel blade, having an outline corresponding to the profile of the slot, is rigidly connected to a shaft rotatably supported to the shorter sides of the slot in an intermediate position.
The disk is coupled by means of a central flange to vertically disposed shaft, driven by an engine through a speed reducer, an axially slidable cylindric
REFERENCES:
patent: 2108470 (1938-02-01), Boulton
patent: 3791754 (1974-02-01), Zochil
patent: 5203642 (1993-04-01), Heller et al.
patent: 5221156 (1993-06-01), Martin
Barikell S.r.l.
Buiz Michael Powell
Patel Rajiv P.
Smith Albert C.
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