U.S. patent application number 15/095463 was filed with the patent office on 2017-10-12 for cylindrical abrasive for floor finishing machine.
The applicant listed for this patent is DIAMOND PRODUCTIONS LTD.. Invention is credited to Pavel Ikonomov, Harvey Stark.
Application Number | 20170291272 15/095463 |
Document ID | / |
Family ID | 59999239 |
Filed Date | 2017-10-12 |
United States Patent
Application |
20170291272 |
Kind Code |
A1 |
Stark; Harvey ; et
al. |
October 12, 2017 |
CYLINDRICAL ABRASIVE FOR FLOOR FINISHING MACHINE
Abstract
A drive plate for a concrete or stone grinding/polishing machine
includes one or more abrasive elements in the form of short steel
cylinders having diamond crystals captured in a hard and durable
brazing alloy. Due to the round profile of the abrasive elements,
as the drive plate is rotated by a drive motor, the abrasive
elements are able to more readily strip mastic, sealers, glue, or
most any thin film topical coating present on concrete or other
hard floors.
Inventors: |
Stark; Harvey; (Montreal,
CA) ; Ikonomov; Pavel; (Laval, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DIAMOND PRODUCTIONS LTD. |
Montreal |
|
CA |
|
|
Family ID: |
59999239 |
Appl. No.: |
15/095463 |
Filed: |
April 11, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B24B 7/18 20130101 |
International
Class: |
B24B 7/18 20060101
B24B007/18 |
Claims
1. In a motorized floor finishing machine having at least one
circular plate having a central hub projecting out from a first
major surface of the circular plate and adapted to be attached to a
motor driven drive shaft, the improvement comprising: an abrasive
member attached to a second major surface of the circular plate,
said abrasive member being a metal bar of a predetermined length
and having a generally circular cross-section over a predetermined
arc with diamond particles brazed on an exterior surface thereof
and arranged such that when the abrasive member is attached to the
circular plate, a longitudinal axis of the abrasive member is
parallel to the plane of the circular plate.
2. The floor finishing machine of claim 1 and further including a
mounting bracket for attaching the abrasive member to the circular
plate.
3. The floor finishing machine of claim 2 wherein the abrasive
member includes a planar surface with at least two threaded bores
extending inward from the flat surface and is secured to the
mounting bracket by bolts extending through apertures in the
mounting bracket and into the threaded bores.
4. The floor finishing machine of claim 1 wherein the diamond
particles have a grit in a range of from 16 to 400.
5. The floor finishing machine of claim 1 wherein the metal bar has
a length in the range of from 0.5 inch (1.27 cm) to 4.0 inch (10.16
cm) and a diameter of 0.5 inch (1.27 cm) to 1.75 inch (4.45 cm).
Description
CROSS-REFERENCED TO RELATED APPLICATIONS
[0001] None
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] None
BACKGROUND OF THE INVENTION
I. Field of the Invention
[0003] This invention relates generally to motor powered floor
finishing machines and, more particularly, to an improved abrasive
for attachment to a drive plate for such machines, the abrasive
being especially adapted for removing mastics, sealers, glue, or
most any thin film topical coating from concrete floor
surfaces.
II. Discussion of the Prior Art
[0004] The prior art includes many patents and publications
describing tools for machining stone or concrete floors. Included
are machines for grinding and polishing, as well as for milling or
crushing floor surfaces. Further, there are machines especially
adapted for cleaning concrete surfaces by removing coatings on
them. Such machines typically carry one or more rotatably mounted,
motor driven drive plates that, in turn, carry one or more abrasive
elements attachable to the motor driven drive plate and adapted to
be rotated in relation to a floor surface. The abrasive elements
affixed to the drive disc typically include abrasive pads or bars
that are made to engage the concrete surface as the drive plate is
being driven and the machine is being moved across the floor
surfaces. Typical of such patents are the Van Vliet U.S. Pat. No.
7,377,838, the Palushaj U.S. Pat. No. 7,690,970 and the Anderson
U.S. Pat. No. 7,563,156,. A major manufacturer and supplier of
concrete and stone grinding and polishing machines is Scanmaskin
Sverige AB of Lindome, Sweden.
[0005] Prior art machines employ a wide variety of abrasive tools
bonded, bolted or otherwise affixed to a circular disc where the
abrasive tools have a planar floor-engaging surface. While such
tools perform well as far as grinding and polishing concrete and
stone floors, they tend not to be particularly effective in
removing paint or glue that had been used in adhering commercial
carpeting or tile to concrete floors. Once the carpeting or tile is
removed, the underlying concrete floor retains a residue of
adhesive material that must be removed prior to polishing the
concrete floor.
[0006] It is the purpose of the present invention to provide an
improved abrasive element attachable to a drive plate for a
floor-finishing machine that is especially designed to aid in
removing paint, mastic, glues, coatings, sealers, or adhesive
residues that may be present on a hard surface.
SUMMARY OF THE INVENTION
[0007] In accordance with the present invention, a motorized floor
finishing machine comprises one or more circular drive plates
having a central hub projecting out from a first major surface of
the circular plate and adapted to be attached to a motor driven
drive shaft. Attached to a second major surface of the circular
plate is an abrasive assembly that may comprise a mounting bracket
and an abrasive member affixed to the mounting bracket.
Alternatively, the abrasive element may be directly attached to the
drive plate. The abrasive member comprises a metal bar having a
generally circular cross-section over a predetermined arc and where
the metal bar has diamond particles adhered by brazing on its
arcuate exterior surface.
[0008] It has been found that when cylindrical abrasive tools are
mounted with their longitudinal axis parallel to the plane of the
drive plate they are considerably more effective in grinding away
thin coatings and adhesives than are conventional abrasive tools
exhibiting a flat floor engaging surface.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The foregoing features, objects and advantages of the
invention will become apparent to those skilled in the art from the
following detailed description of a preferred embodiment,
especially when considered in conjunction with the accompanying
drawings in which like numerals in the several views refer to
corresponding parts.
[0010] FIG. 1 is a bottom plan view of a drive plate incorporating
four abrasive assemblies;
[0011] FIG. 2 is a front view thereof; and
[0012] FIG. 3 is an exploded view of one of the abrasive assemblies
shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] The description of the preferred embodiment is intended to
be read in connection with the accompanying drawings, which are to
be considered part of the entire written description of this
invention. In the description, relative terms such as "lower",
"upper", "horizontal", "vertical", "above", "below", "up", "down",
"top", and "bottom", as well as derivatives thereof (e.g.,
"horizontally", "downwardly", "upwardly", etc.), should be
construed to refer to the orientation as then described or as shown
in the drawings under discussion. These relative terms are for the
convenience of description and do not require that the apparatus be
constructed or operated in a particular orientation. Terms, such as
"connected", "connecting", "attached", "attaching", "join", and
"joining", are used interchangeably and refer to one structure or
surface being secured to another structure or surface or integrally
fabricated in one piece, unless expressly described otherwise. As
used herein, the term "floor treating machine" is meant to include
floor grinding, floor polishing, floor burnishing, floor scrubbing
and swing machines.
[0014] Referring to FIG. 1 and FIG. 2, there is indicated generally
by numeral 10 one configuration of a drive plate for a concrete
floor finishing machine such as a grinder or polisher. It is seen
to comprise a steel plate 12 having a cylindrical hub 14 affixed to
a first major surface 16 thereof where the hub 14 is adapted to
receive a drive shaft of a motor for driving the drive plate 12
about a central axis of the hub 14.
[0015] The second major surface 18 of the drive plate 12 may have a
plurality of symmetrically arranged recesses, as at 20, milled
inward from the surface 18 to form pockets for receiving abrasive
assemblies 22 therein. Alternatively, the second major surface of
the drive plate may be flat and void of pockets.
[0016] Referring to FIG. 3, there is illustrated an exploded view
of one of the abrasive assemblies 22. It is seen to comprise a
bracket in the form of a metal plate 24 to which is attached an
abrasive element 26. In the drawings, the mounting bracket is shown
as being somewhat V-shaped, but with a rounded vertex. However, the
bracket shape can be changed along with the shape of the pockets in
the drive plate. As seen in FIG. 3, rather than being a rectangular
bar, as in the prior art, the abrasive element 26 is generally a
right circular cylinder over a major portion of its circumference
save for a flat area 28 which is adapted to abut the bracket 24. As
seen in FIG. 3, the abrasive element 26 is shown as being secured
to the bracket 24 by screws 30 which pass through apertures 32 in
the bracket and into threaded bores formed in the flat surface 28
of the abrasive element 26. In use, the longitudinal axis of the
abrasive element is parallel to the plane of the drive plate 12.
Those skilled in the art will appreciate that the abrasive elements
26 can also be directly affixed to the drive plate 12 without the
use of a bracket.
[0017] The abrasive element itself preferably comprises a steel
cylinder, the arcuate surface of which is covered by diamond
crystals imbedded in a braze alloy which may be applied in the
manner described in the Lowder et al U.S. Pat. No. 3,894,673.
[0018] Without limitation, the abrasive element 26 preferably
comprises steel cylinder and may have a length dimension in a range
of from 0.5 inch to 4 inch with a diameter in the range of 0.5 inch
to 1.75 inch.
[0019] The abrasive assemblies 22 are shown mounted in the pockets
20 of the drive plate 12 by bolts 34, which pass through apertures
36 drilled through the brackets 24 and into tapped holes (not
shown) formed in the pockets of the drive plate 12. As already
mentioned, the abrasive elements can be directly bolted onto the
drive plate 12.
[0020] When removing mastic, sealers, glue, or most any thin film
topical coating, one of the challenges is surface contact between
floor and tool, which generates heat. This heat melts the surface
coating, which gums up and clogs the abrasive tool.
[0021] The use of a cylindrical diamond coated surface reduces the
contact area with the floor thereby reducing generated heat.
Moreover, the active contact spot is in a line, or row of diamonds,
which leads to the tool performing a cutting and scraping job as
opposed to grinding, the former being more desirable for coating
removal. This row of diamonds has a much greater number of cutting
elements than the surface of a conventional rectangular bar segment
that has diamonds sporadically embedded and is therefore more
efficient and effective.
[0022] Another advantage of the round, cylindrical tool is the wear
pattern that occurs during use. As a rectangular bar segment wears,
the full surface is in contact with the floor, which not only
generates friction and heat, but also directs the abrasive action
downwards as opposed to more laterally interfacing with the floor
with a single row of diamonds as the tool wears out, as is the case
with the cylindrical tool of the present invention.
[0023] This invention has been described herein in considerable
detail in order to comply with the patent statutes and to provide
those skilled in the art with the information needed to apply the
novel principles and to construct and use embodiments of the
example as required. However, it is to be understood that the
invention can be carried out by specifically different devices and
that various modifications can be accomplished without departing
from the scope of the invention itself.
* * * * *