US 20060025059 A1
A grinding machine abrasive unit holder with the use of springs, gases or fluids allows each abrasive unit to be in contact with the floor, independently at all times. This action allows the finishing of the high and low spots of the floor in the same operation.
1. A floor polisher comprising:
a rotating plate;
a multiplicity of variable vertical displacement mounting devices attached to said plate; and
an abrasive unit attached to each vertical displacement mounting device of said vertical displacement mounting devices wherein said vertical displacement mounting device comprises a leaf spring and said abrasive unit trails said spring.
2. The floor polisher of
4. The floor polisher of
5. The floor polisher of
6. The floor polisher of
7. The floor polisher of
9. The floor polisher of
10. The floor polisher of
11. The floor polisher of
12. The floor polisher of
13. The floor polisher of
a cylindrical abrasive head; and
a frustoconical mounting head.
14. An abrasive unit particularly adaptable for use with a floor polisher comprising:
a cylindrical abrasive head; and
a frustoconical mounting head and a leaf spring between said abrasive head and said mounting head.
16. A floor polisher comprising:
a rotating plate;
a multiplicity of leaf springs attached to said plate; and
an abrasive unit attached to each leaf spring of said leaf springs wherein said abrasive unit trails said spring.
17. The floor polisher of
18. The floor polisher of
19. The floor polisher of
20. The floor polisher of
21. The floor polisher of
23. The floor polisher of
The present application is a continuation in part application of U.S. patent application Ser. No. 10/900,786 filed Jul. 28, 2004 which is pending.
The present invention is related to a system for polishing concrete. More particularly, the present invention is related to a system, and method, for polishing concrete without the typical problems of uneven polishing in the valleys and hills of poured concrete.
Polishing concrete has been known for some time. The abrasive units of floor grinding machines are typically rigidly attached to the drive mechanism of the machine thus allowing the abrasive units to operate in a single plane. Despite the most skilled of floor finishers concrete floors are not perfectly flat. A typical technique for polishing concrete will be described with reference to
Course abrasive units remove a substantial amount of concrete to eliminate any hills. Often this exposes aggregate, or rock filler, in the concrete. As the polishing continues those areas that were originally in a valley are not polished or grinded to the same degree and the aggregate is therefore not exposed. The end result is a floor with some portions having exposed aggregate and other portions not having exposed aggregate. This is unsightly.
Yet another problem with the prior art is the high cost associated with time and material for the polishing or grinding process. Multiple polishing operations are required with each using successively less course abrasive units. The multiple operations are time consuming. The course abrasive units typically create scratches, or gouges, in the concrete which must be removed with the less course abrasive unit. In many instances the final floor still has scratches and gouges since it is very difficult to remove them all with the time and resources typically allotted for such an operation.
Yet another problem is the loss of abrasive units due to breakage. As the abrasive unit crosses a valley and reengages with a hill it is not uncommon for parts of the abrasive unit to become dislodged or broken. This damage greatly decreases the useful lifetime of abrasive units.
There has been a long felt desire for a floor polishing system which can effectively polish a floor without regard for hills and valleys and the differential grinding required to polish both.
It is an object of the present invention to provide a flexible mounting of the abrasive unit that will allow for finishing of concrete floors without the need to grind the high spots to a lower level.
It is another object to provide an abrasive unit, and holder, which can be attached to a conventional plate. The method of attachment allows the holder to “float” or move in a vertical direction thereby allowing the abrasive unit to contact the floor at all times and everywhere.
A particular feature of the present invention is that the high spots, or hills, do not have to be ground down to the level of the low spots, or valleys, thereby achieving a uniform appearance which is aesthetically pleasing.
Another particular advantage is a substantial savings in time and labor. Larger floor areas can be completed in a given time period.
Yet another advantage is the increased longevity of the improved abrasive units.
Yet another advantage is the elimination of multiple passes with successively decreasing coarseness. This advantage is due to the elimination of the necessity to decrease the height variations in the floor. A concrete floor can be rendered smooth and aesthetically pleasing in a single pass with a low coarseness abrasive unit.
These and other advantages, as will be realized, are provided in a floor polisher with a rotating plate, a multiplicity of variable vertical displacement mounting devices attached to and plate, and an abrasive unit attached to each vertical displacement mounting device.
Yet another embodiment is provided in an abrasive unit particularly adaptable for use with a floor polisher. The abrasive unit has a cylindrical abrasive head and a frustoconical mounting head.
Yet another embodiment is provided in a floor polisher with a rotating plate, a multiplicity of variable vertical displacement mounting devices attached to the plate and an abrasive unit attached to each vertical displacement mounting device. In the improvement the abrasive unit has a cylindrical abrasive head and a frustoconical mounting head.
Yet another embodiment is provided in a floor polished with a rotating plate, a multiplicity of leaf springs attached to the plate and an abrasive unit attached to each leaf spring.
The invention will be described with reference to the various figures. The figures represent part of the present disclosure but are not intended to limit the scope of the invention. Within the various figures similar elements will be numbered accordingly.
A floor polisher is illustrated in
It is preferably that the abrasive unit, 4, be received by an abrasive holder, 12, which will be described further herein. A mounting bracket, 13, is preferred for securing the leaf spring, 9, to the plate, 5. A mounting bracket, 14, is also preferred for securing the abrasive holder, 12, to the spring.
A plate with three abrasive assembly units is shown from bottom view in
In a particularly preferred embodiment the abrasive unit trails the location of the mounting of the spring to the plate. For example, with the device illustrated in
The leaf spring strength is selected to be sufficiently strong to support the weight of the floor polisher at a sufficient height that the abrasive unit end of the spring does not contact the plate in normal use. It is also important that the spring be sufficiently displaced by the weight of the floor polisher to maintain the abrasive unit in a substantially planar relationship with the floor. It would be apparent from the description that as the abrasive unit moves vertically in response height variations in the floor the angle of the abrasive unit is slightly altered. Within the range of travel typically employed in the present invention the deviation from planarity is acceptable.
An alternate embodiment is shown in bottom view in
The coil spring is selected to be sufficiently compressed by the weight of the floor polisher such that the abrasive unit can travel downward the length of standard valleys without the ledges restricting further movement. The coil spring is also sufficiently strong that the abrasive unit does not contact the plate or any structure which limits the upward movement when the full weight of the floor polisher is placed upon the multiplicity of abrasive units. With properly chosen coil springs each abrasive unit is in contact with the floor and the floor polisher is suspended by the coil spring.
Another alternate abrasive unit mounting is shown in bottom view in
The abrasive units typically comprise an abrasive material in a binder and a base. The abrasive material is preferably selected from diamond, silicon carbide, aluminum oxide and E.C. Diamond is the most preferred abrasive.
The binder material is chosen, in part, based on the size of the abrasive particles. Particularly preferred binders include sintered bond, electroplate bond, vacuum brazed bond, epoxi bond, resin bond, phenolic bond and E.C. The most preferred binder materials are sintered bond, vacuum brazed bond, phenolic bond and resin bond.
The abrasive units are typically classified by courseness with the higher number representing a finer abrasive material and a lower number representing a larger abrasive material. As would be realized, the larger the abrasive material the more aggressive the abrasive unit will be with regards to concrete removal. A particular feature of the present invention elimination of the necessity for aggressive abrasive units. In the prior art the aggressive abrasive units are necessary to decrease the variation described herein as hills and valleys. With the present invention a fine particle abrasive unit can be employed initially thereby greatly reducing the effort and greatly decreasing the time and cost of obtaining a smooth floor which is also more aesthetically pleasing.
Yet another advantage with the present invention is the long life of the abrasive unit. Eliminating the collision between the abrasive unit and a hill, as described previously, increases the lifetime of the abrasive unit. Larger particle, more aggressive, abrasive units are also more fragile due to the decrease in the ratio of binder to abrasive material and they are therefore also more likely to encounter hills since it is at the early stage that these abrasive units are used. Therefore, the present invention provides a substantial cost benefit which is not otherwise achievable in the art.
The invention has been described with particular emphasis on the preferred embodiments. It would be apparent from the description, discussion and ability of one with ordinary skill in the art to provide alternate embodiments and uses without departing from the scope of the invention as set forth in the claims appended hereto. It is contemplated that the invention could be used with other surfaces such as walls, ceilings, tiles, etc.