U.S. patent number 3,793,128 [Application Number 05/205,049] was granted by the patent office on 1974-02-19 for chair mat.
This patent grant is currently assigned to Chancellor Chair Company. Invention is credited to Charles W. Chancellor, Jr..
United States Patent |
3,793,128 |
Chancellor, Jr. |
February 19, 1974 |
CHAIR MAT
Abstract
A floor protecting mat of the type used with rolling chairs when
used in conjunction with a desk especially when carpeting is
employed as a floor covering and including a laminated panel having
a core in the form of a panel encapsulated with glass fiber
reinforced resin with the core having a plurality of recesses in
the surfaces thereof for receiving the resin and keying the resin
encapsulation to the core.
Inventors: |
Chancellor, Jr.; Charles W.
(Midland, TX) |
Assignee: |
Chancellor Chair Company
(Midland, TX)
|
Family
ID: |
22760571 |
Appl.
No.: |
05/205,049 |
Filed: |
December 6, 1971 |
Current U.S.
Class: |
428/76; 427/290;
428/157; 427/202; 428/141 |
Current CPC
Class: |
A47G
27/0206 (20130101); B29C 70/00 (20130101); Y10T
428/24355 (20150115); Y10T 428/24488 (20150115); Y10T
428/239 (20150115); B29K 2309/08 (20130101) |
Current International
Class: |
B29C
70/00 (20060101); B32b 001/04 (); B32b
003/10 () |
Field of
Search: |
;161/44,113-115,149,161 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Drummond; Douglas J.
Attorney, Agent or Firm: O'Brien; Clarence A. Jacobson;
Harvey B.
Claims
What is claimed as new is as follows:
1. A chair mat for use in supporting a movable chair in association
with a desk comprising a rigid laminated panel, said panel
including a core, a coating encapsulating said core, and means
interlocking the top and bottom coating to the core throughout
substantially the entire surface area thereof, said means
interlocking the coating and core including a plurality of recesses
in both surfaces of the core, said coating being in the form of a
glass fiber reinforced plastic resin flowable into the recesses
when applied and becoming rigidly interlocked therewith when cured
thereby interlocking the core and coating to prevent delamination
thereof, said coating on the undersurface of the core extending
upwardly around the periphery and inwardly over the edge portion of
the upper surface of the core, the coating on the upper surface of
the core extending downwardly alongside of the periphery of the
core and the undersurface coating around the periphery of the core
thereby providing a double coating on the peripheral edge and edge
portion of the mat, the lower surface of the mat being provided
with a roughened coating of foam plastic thereon to further reduce
slippage, said undersurface of the mat also being constructed with
a concavity whereby the peripheral edge thereof is slightly lower
than the central portion thereof for effectively gripping a carpet
or the like, the peripheral edge of said core being bevelled along
the top surface thereof to provide a top bevelled edge on the chair
mat to prevent a person from tripping over the edge of the mat and
to enable a chair with rollers thereon to be rolled onto the chair
mat, said recesses extending inwardly into the surfaces of the core
a distance substantially one-half of the depth thereof with the
recesses in the upper surface of the core being staggered in
relation to the recesses in the lower surface of the core, each of
said recesses being in the form of an independent socket having a
peripheral wall substantially perpendicular to the surface of the
core.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a floor mat for use
under chairs to protect the flooring material, such as carpeting,
on which the chair is located with the mat having an interlocking
structural connection between a core panel and glass fiber
reinforced resin material covering and encapsulating the panel.
2. Description of the Prior Art
Chair mats for protecting flooring material from damage and wear
from chair rollers and the like have been used and generally are
formed of a flat panel of transparent or colored plastic material,
a panel of pressed board or the like which is generally rectangular
in configuration with a projecting edge portion on one edge thereof
for extending under the kneehole-receiving area of a desk. While
such devices are successful, one problem which occurs is the
tendency of the edges of such panels to curl upwardly when the
weight of the chair and the occupant thereof pushes downwardly on
or engages the central portion of the panel. This upward curling of
the edges permits the chair mat to move in relation to the desk
which is objectionable and frequently the upwardly curled edge
creates a danger of a person tripping over a stumbling over the
edge. In addition, previously known chair mats have a relatively
short life expectancy and frequency become unsightly due to
marring, scuffing and the like caused by movement of the chair
rollers or other chair-supporting elements across the upper surface
thereof.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a chair mat
including a core of pressed material such as "masonite" having a
covering or coating of glass fiber reinforced plastic resin which
completely encapsulates the core.
Another object of the invention is to provide a chair mat having a
bevelled top edge around the periphery thereof to rigidify the mat
and prevent the edges thereof from curling upwardly.
Still another object of the invention is to provide a chair mat in
accordance with the preceding objects in which the surfaces of the
core are provided with a large number of recesses throughout the
upper and lower surface area thereof for receiving the glass fiber
reinforced plastic resin coating on the core thereby rigidly
interlocking the core and coating to prevent delamination of the
coating in relation to the core.
A further object of the invention is to provide a chair mat in
which the bottom surface is provided with an antislipping material
that is bonded to the resin before curing thereof and is in the
form of a plastic foam dust which will further enhance the
antislipping characteristics of the mat.
Yet another important feature of the present invention is to
provide a chair mat having a slightly concave bottom so that the
periphery thereof will effectively grip the carpet or underlying
floor surface to further prevent slippage thereof.
These together with other objects and advantages which will become
subsequently apparent reside in the details of construction and
operation as more fully hereinafter described and claimed,
reference being had to the accompanying drawings forming a part
hereof, wherein like numerals refer to like parts throughout.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top plan view of a chair mat of the present invention
with a portion thereof broken away illustrating the orientation of
the recesses in the core.
FIG. 2 is a side elevational view of the construction of FIG.
1.
FIG. 3 is a fragmental, sectional view, on an enlarged scale, taken
substantially upon a plane passing along section line 3--3 of FIG.
1 illustrating further structural details of the chair mat.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now specifically to the drawings, the chair mat of the
present invention is generally designated by the reference numeral
10 and includes a panel of generally T-shaped configuration
including a main panel 12 of rectangular or square configuration
and a projecting panel 14 along the center of one edge thereof for
extending into the area in underlying relation to the kneehole of a
desk so that a chair placed on the mat 10 may be moved toward and
away from the desk with the rollers normally provided on a chair
engaged with the upper surface of the chair mat 10.
The chair mat 10 includes a central core 16 of a pressed gypsum and
fibrous material such as commercially available material known as
"masonite." The core 16 has a coating 18 on the top surface thereof
and a coating 20 on the bottom surface thereof which are laminated
to the core 16 and which are constructed of glass fiber reinforced
plastic resin. As illustrated in FIG. 3, the lower coating 20
extends up around the edge and includes an inwardly extending
portion 22 overlying a portion of the upper surface of the core 16
while the upper coating 18 extends downwardly around the peripheral
edge of the core 16 as indicated at 24 thereby completely
encapsulating the core 16.
As illustrated in FIG. 2 by the spaced opposed arrows, the bottom
surface of the chair mat is slightly concave as at 26 so that the
peripheral edge thereof will more effectively engage or bite into
the carpet or underlying floor surface to prevent slippage
thereof.
Both the top and bottom surface of the core 16 is provided with a
large number of recesses 28 which may be circular, square or any
other configuration with the sidewalls of the recess being
substantially parallel and the inner surface or bottom thereof
being parallel to the surfaces of the core 16 thus providing for
interlocking engagement between the core 16 and the coatings 20 and
18 by virtue of the glass fiber reinforced resin filling the
recesses 28 when in an uncured state so that when the resin cures
or dries, the resin coatings 18 and 20 will be rigidly laminated
with respect to the core 16.
Also as illustrated in FIG. 3, the peripheral edge of the core 16
has the upper surface thereof downwardly bevelled or inclined as at
30 thereby providing a bevelled or downwardly inclined peripheral
edge 32 on the chair mat 10 to prevent any possibility of a person
tripping over a stumbling over the edge of the mat and also
rigidifying the mat.
In the construction of the chair mat, the core 16 is bevelled
around the peripheral edge after being cut to shape and the
recesses 28 formed therein by any suitable cutting tool such as a
multiple drill arrangement or the like and placed in a mold where
the concavity is formed in the undersurface thereof or the
undersurface thereof is formed with the concavity by using a
suitable material removing device engaged with the undersurface
thereof. The coating 18 may be any suitable laminating polyester
resin such as sold by PPG Industries, Inc. and identified by No.
97-009.
The undersurface of the core is then provided with the coating 20,
which may be of the same material as coating 18, of glass
reinforced resin such as by using a conventional "chopper gun"
application with the coating 20 extending around the edge of the
core and into overlying relation to a portion of the upper surface
thereof as indicated at 22 in FIG. 3. While the coating 20 on the
undersurface of the core 16 is still uncured or wet, foam dust,
which may be any standard styrofoam material which will absorb the
wet resin, is sprayed onto the coating and will adhere or be
embedded therein partially to provide a roughened surface to more
effectively adhere to a carpet and thus reduce slippage of the
chair mat. The coating 18 is then applied to the top surface and
around the periphery of the mat with this coating being the same as
that employed in the bottom coating 20. Any trimming necessary may
be accomplished on the edges to provide a finsihed product unless a
particular color is desired. The surface of the chair mat may be
painted with a suitable vinyl paint or color pigment may be
incorporated into the resin when forming the top coat or when
forming both of the coats if desired.
To provide a textured surface if desired, the coating 18 while
uncured and still wet may be provided with a smooth woven fiber
glass cover which is "layed" onto the resin in a well known manner.
After the chair mat has completely cured, it is ready for use and
the roughened undersurface thereof prevents slippage and the color
of the chair mat may blend in with the carpet or contrast therewith
depending upon the desires of each user. In addition, the
interlocking connection between the core and coatings prevent
relative movement therebetween and thus prevent delamination of the
structure with the overlapping portions of the coatings also
serving to prevent delamination. The overlapping coating portions
at the periphery of the core provide reinforcement for this area
and prevent the core from breakage even though a chair with an
occupant thereon is rolled off the edge of the chair mat. The
tapered surface or bevelled edge facilitates movement of the chair
rollers back onto the chair mat and also eliminates a person
tripping over or stumbling over the edge of the mat.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous modifications and changes
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation
shown and described, and accordingly all suitable modifications and
equivalents may be resorted to, falling within the scope of the
invention.
* * * * *