U.S. patent number 3,616,104 [Application Number 04/714,559] was granted by the patent office on 1971-10-26 for artificial lawn element.
Invention is credited to Paul L. Kuzmick.
United States Patent |
3,616,104 |
Kuzmick |
October 26, 1971 |
ARTIFICIAL LAWN ELEMENT
Abstract
An artificial outdoor lawn is formed by interconnecting a
plurality of lawn elements, each lawn element including a pin which
is adapted to be received within a mating opening provided in an
adjacent lawn element, thereby to produce said interconnection.
Projections are provided on the underside of each element to
provide a clearance area beneath the lawn element when it is
supported on a surface, thereby to permit drainage of water from
said element. The appearance and density of natural grass is
effectively simulated by providing a plurality of tufts of
artificial grass blades in different arrangements over the upper
portion of the lawn and by appropriately configuring the upper
surface of the base from which said tufts extend.
Inventors: |
Kuzmick; Paul L. (Essex Fells,
NJ) |
Family
ID: |
24870521 |
Appl.
No.: |
04/714,559 |
Filed: |
March 20, 1968 |
Current U.S.
Class: |
428/17; 428/88;
428/53 |
Current CPC
Class: |
A41G
1/009 (20130101); A47G 27/0481 (20130101); Y10T
428/23929 (20150401); Y10T 428/17 (20150115) |
Current International
Class: |
A41G
1/00 (20060101); A47G 27/00 (20060101); A47G
27/04 (20060101); A41g 001/00 () |
Field of
Search: |
;161/21,62,63,123,149,116,119 ;27/29,30 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Ansher; Harold
Assistant Examiner: Epstein; Henry F.
Claims
I claim:
1. A lawn element adapted for use in the formation of an artificial
lawn simulating the appearance of a natural lawn, said lawn element
comprising a base, and grass simulating means extending upwardly
from said base, said simulating means comprising a first plurality
of tufts comprising a plurality of artificial grass blades arranged
essentially in a plurality of pairs of concentric circles, the
blades of the outer circle being of a substantially different
length than the blades of the inner circle, and a second plurality
of tufts comprising artificial grass blades arranged essentially in
a single circle and tufts of said second plurality being located on
said base between said tufts of said first plurality.
2. The lawn element of claim 1 further comprising a plurality of
randomly arranged ridges formed on the upper surface of said base,
thereby to more perfectly simulate the texture of a natural
lawn.
3. An artificial lawn element adapted to be placed on a supporting
surface in conjunction with other similar elements to simulate the
appearance of a natural grass area, said lawn element comprising a
base, a plurality of tufts in the form of blades of grass
projecting upwardly from said base, a portion of said tufts being
arranged in essentially two concentric circles, and a plurality of
randomly oriented ridges formed on the upper surface of said base
thereby to simulate the texture of a natural lawn.
4. An artificial lawn element adapted to be placed on a supporting
surface in conjunction with other similar lawn elements to simulate
the appearance of a natural grass area, said elements comprising a
base, grass simulating means projecting upwardly from said base,
and a plurality of randomly arranged ridges formed on the upper
surface of said base, thereby to simulate the texture of a natural
lawn.
5. A lawn element adapted for use in the formation of an artificial
lawn simulating the appearance of a natural lawn, said lawn element
comprising a base, and grass simulating means extending upwardly
from said base, said simulating means comprising a plurality of
tufts comprising a plurality of artificial grass blades arranged
essentially in a plurality of pairs of concentric circles, the
blades of the outer circle being of a substantially different
length than the blades of the inner circle.
Description
The present invention relates to an artificial ground surface, and
particularly to an artificial surface which simulates the
appearance of a grassy lawn.
The exodus of residents from the urban areas to the suburban and
rural areas of this country has produced a sharp increase in the
number of people owning and living in their own homes. In an
attempt to enhance the pleasures derived from such home ownership,
outdoor gardens, patios, swimming pools, and the like are installed
in the areas around the house. The appearance of these additions to
suburban residences is often improved by providing a grassy lawn
area of a desired pattern and size in their vicinity. However, the
growing and care of lawn areas is often a burdensome and expensive
procedure, requiring repeated purchases of fertilizer and seeds,
and frequent watering, weeding, and trimming of the lawn.
To avoid the problems inherent in the maintaining of a natural
grassy lawn, a great number of home owners have resorted to the use
of artificial lawns in some areas where such a lawn would be
desirable. Artificial lawns comprise a base from which artificial
grass blades "sprout." They are generally made of a plastic
material, such as polyethylene, to which a suitable green color is
applied.
Artificial lawns are also popular for use indoors in homes and
apartments for decorative purposes or to give a desired floor
texture, and in displays or showroom areas.
Artificial lawns have the advantage over natural lawns that they do
not require soil or light, remain constantly green throughout the
year, require little or no care to maintain their appearance, and
may be used indoors as well as out. As such, artificial lawns of
the type described are finding ever increasing popularity among
home owners, apartment dwellers, and industrial and commercial
concerns.
There are, however, several difficulties which have been
encountered in the use of the known artificial lawns. For example,
liquid, coming from rain, cleaning or spilling, tends to collect in
pools between the artificial blades, and not having a true earth in
which to be absorbed, remains there, and deteriorates the plastic
material.
It also happens that water may get between the lawn elements and
their supporting surface. With artificial lawns of the prior art,
such water tends to accumulate in pools, deteriorating both the
lawn elements and their support, as well as constituting an
unsanitary condition.
Since artificial lawns are molded, since their size and shape will
vary from installation to installation, and since they often must
cover very large areas, it is as a practical matter inescapable
that they must be made up of a plurality of individual elements.
Those elements must be held in position securely, and with no
visible gaps between them. To individually cement the elements in
place, like a tile floor, is very expensive, difficult and
time-consuming, and can only be done where the supporting surface
permits. It is, therefore, highly desirable that the elements be
interconnectable in a manner which is secure, simple to effect, and
inconspicuous.
It is also desirable, in artificial lawns, for the overall
appearance of the lawn to approximate or simulate the appearance of
a well-tended natural lawn as perfectly as possible. This includes
the provision of an accurate simulation of the color, density and
texture of both the grass and the background of a natural lawn.
Furthermore, known artificial lawns are generally formed on a
plastic base which is normally smooth-surfaced and hence highly
reflective, so that glare results at certain angles of incident
light.
It is therefore a prime object of the present invention to provide
an artificial lawn which substantially eliminates all of the above
disadvantages of the presently known artificial lawns, and which
produces an improved simulation of appearance to more nearly
approximate the appearance of a natural lawn.
It is a more specific object of the present invention to provide an
artificial lawn formed from a plurality of individual lawn elements
wherein the means for interconnecting adjacent elements of the lawn
is secure, easy to effect, and inconspicuous in the completed
artificial lawn.
It is a further object of the present invention to provide an
artificial lawn in which proper drainage is insured of the rain or
other liquid tending to collect on the upper surface of the lawn or
to be caught between the lawn elements and their supporting
surface.
It is another object of the present invention to provide an
artificial lawn in which a more accurate simulation of grass
texture and density is achieved.
It is yet a further object of the present invention to provide an
artificial lawn in which glare from the base surface is
substantially reduced, and in which a more accurate approximation
of background texture is achieved.
To these ends, the present invention provides an artificial lawn
which is formed from a plurality of individual lawn elements
adapted to be interconnected with one another. The individual lawn
elements are provided with pin means and mating openings adjacent
their joined edges, the pin means of one element being received
securely through the opening of an adjacent element, thereby to
provide the interconnection between the adjacent lawn elements,
with the pin means being camouflaged from view so as not to mar the
visual impact of the assembly of elements.
In a further aspect of the present invention, element-supporting
projections provided on the underside of the base of each lawn
element produce a clearance between the base and the outdoor
surface on which the artificial lawn is placed during its use.
Drain holes are provided in the base in communication with the
clearance to provide a drainage of any rain or other water which
may tend to collect on the upper surface of the lawn. The
element-supporting projections are so designed that the
water-receiving clearance areas facilitate water drainage
therefrom, so that water may drain away and not accumulate in
pools.
In yet another aspect of the present invention, an improved
simulation of natural grass is achieved by providing two groups of
tufts extending from the upper surface of the base, the tufts each
comprising a plurality of artificial grass blades arranged in
different forms, and, if desired, varying heights, in a manner as
to simulate the nonuniform density of growth of natural grass.
Preferably, the pin means associated with the interconnection of
adjacent lawn elements in inserted into the center of one of the
tufts, thereby to be effectively camouflaged or shielded from view
in the completed artificial lawn. The interconnection between
adjacent lawn elements is made even more inconspicuous by providing
the joining edges of adjacent lawn elements with mating lateral
hills and valleys.
To the accomplishment of the above, and to such other objects as
may hereinafter appear, the present invention relates to an
artificial lawn and elements therefor, as defined in the appended
claims, and as described in this specification, taken together with
the accompanying drawings in which:
FIG. 1 is a top plan view of a segment of an artificial lawn formed
according to the present invention;
FIG. 2 is a top plan view of an individual lawn element used in
forming the artificial lawn of FIG. 1;
FIG. 3 is a bottom plan view of the lawn element of FIG. 2;
FIG. 4 is a side elevation of the lawn element of FIG. 2;
FIG. 5 is an enlarged detailed view of a corner section of the lawn
element of FIG. 2;
FIG. 6 is a cross-sectional view taken along the lines 6--6 of FIG.
5;
FIG. 7 is a fragmentary bottom plan view showing portions of
adjacent lawn elements prior to their interconnection;
FIG. 8 is a fragmentary bottom plan view illustrating the manner in
which the four adjacent lawn elements of FIG. 7 are interconnected
in the formation of the completed artificial lawn as in FIG. 1;
FIG. 9 is an enlarged cross-sectional view taken across lines 9--9
of FIG. 8 illustrating the manner in which the ends of adjacent
lawn elements are engaged to form the completed artificial lawn of
FIG. 1; and
FIG. 10 is a view similar to FIG. 9, illustrating another
embodiment of means for interconnecting adjacent lawn elements.
FIG. 1 illustrates an artificial lawn designated generally as 10,
which is formed by the interconnection of a plurality of individual
lawn elements 12, several of which are shown in FIG. 1. In a
typical embodiment of this invention, each lawn element 12 may be
12 inches square. The lawn elements may be interconnected to form
any desired configuration of the completed lawn 10, compatible with
the dimension of the individual lawn element 12.
The individual lawn element 12 comprises a base 14 having an upper
surface 16 (FIG. 2) and a lower surface 18 (FIG. 3). A plurality of
substantially equally spaced tabs 20 project transversely outwardly
from two adjacent edges 22 and 24 of the lawn elements 12.
Projecting upwardly from each of the tab elements is an upstanding
securing pin 26. The other edges 28 and 30 of lawn element 12 are
provided with recessed fastening area 32 formed on the underside 18
of base 14, the fastening areas 32 being also substantially equally
spaced at intervals corresponding to the spacing between the tabs
20. Each fastening area 32 is provided with an opening 34 extending
through the entire thickness of base 12. A plurality of mating
scallops or lateral hills and valleys 33 and 35, here shown as, but
not necessarily, curved, are formed on each edge of the lawn
element, the scallops on edges 22 and 24, respectively, being
adapted to mate with the scallops on edges 28 and 30 in the manner
shown in FIGS. 1 and 8.
To simulate the appearance of natural grass, a plurality of tufts,
each comprising a plurality of artificial thin and flexible grass
blades, extends upwardly from the upper surface of base 14.
Preferably, the base 14, tabs 20, pins 26 and the simulated grass
blades are integrally formed in a one-piece molded plastic
construction. Polyethylene is a suitable plastic material which may
be used. As is best seen in FIGS. 5 and 6, the tufts of blades of
grass are divided into two different pluralities of tufts
designated generally as 36 and 38. The first plurality of tufts 36
comprises two concentric rings of blades 40 and 42, the outer ring
40 shown as comprising a total of eight upstanding blades 41 and
the inner ring 42 shown as comprising a total of four upstanding
blades 43. The blades may be of the same or different heights, as
desired. As here specifically disclosed, the height of the blades
41 in the outer concentric circle 40 is approximately one-third
greater than the height of the blades 43 within the inner
concentric circle 42. The second plurality of tufts 38 comprises a
single ring of four blades 44, the height of which may be as
desired. As here specifically disclosed, their height is
substantially the same as the height of blades 43 (see FIG. 6). The
tufts 36 and 38 are alternately and uniformly distributed over the
entire upper surface 16 of the base 14; that is, each tuft of one
type is directly adjacent and surrounded by tufts of the other
type. The alternating distribution of the two different types of
blade tufts provides a nonuniform density of grass blades,
corresponding to the overall density and texture of a natural
grassy lawn. This heightens the feeling of verisimilitude of the
artificial lawn of the present invention.
To further heighten this illusion of reality, a plurality of
randomly arranged intersecting ridges 45 are formed on the upper
surface 16 of each lawn element 12. It has been found that the
provision of ridges 45 over the entire upper surface arranged in
the random, crisscross manner shown in FIG. 5, provides a textural,
visual sensation similar to that of the earth or ground in a
natural lawn, the ridges simulating broken blades of grass which
have fallen to ground level. Furthermore, the ridges 45 serve to
decrease the amount of glare from the plastic upper surface 16 as
compared to a plastic surface in which such ridges are not
provided.
The bottom surface 18 of lawn element 12 comprises a plurality of
diagonally oriented integral ribs 46 which, as here specifically
disclosed, extend along both major diagonals of the square base
element 12, and along diagonal lines parallel to each of the major
diagonals. It is to be noted that the ribs 46 are not continuous,
thereby defining a plurality of gaps such as gap 48, in the spaces
between the ends of adjacent ribs 46. Also provided integrally with
the bottom surface 18 are a plurality of cylindrical bosses 50,
located substantially at the center of each square defined by the
diagonal ribs 46. Bosses 50 and ribs 46 define support parts which
project downwardly from the lower surface 18 of base 12 by
substantially the same distance, which preferably corresponds to
the general level of the lower surfaces 52 of tabs 20 (see FIG. 9).
Thus, when the individual lawn elements 12 are interconnected in a
manner to be described to form the complete artificial lawn 10, the
lawn 10 will rest upon its supporting surface on only the ribs 46,
the bosses 50, and the lower surfaces 52 of the tabs 20.
FIG. 7 illustrates four adjacent lawn elements 12 immediately prior
to their interconnection, and FIG. 8 shows them after they have
been interconnected.
The lawn elements 12 are brought together such that the edges 22
and 24 of a given element 12, from which the tabs 20 and pins 26
extend, oppose the edges 28 and 30 of the adjacent element 12a, in
which the openings 34 are provided. As shown in FIG. 9, the
openings 34 of lawn element 12a are placed directly above the
respective pins 26 of lawn element 12b and in registry therewith.
Pin 26 comprises a reduced radius portion 54 at its upper and lower
ends, and an enlarged downwardly and outwardly sloping portion 56
terminating at an annular shoulder 57. Lawn element 12a is then
pressed downwardly, the sloping pin portion 56 acting in a
wedge-like fashion on the inner walls of the opening 34 to permit
the righthand lawn element 12 to snap past shoulder 57. The
shoulder 57 prevents upward movement of the lawn element 12a with
respect to the pin 26 of lawn element 12b. The embodiment shown in
FIG. 8 is similar to that of FIG. 7, with the exception that the
lawn element 12 is of uniform thickness, the fastening portion 32
being unrecessed.
It will be noted that, as shown in FIG. 5, the openings 34 are
provided centrally in each of the tufts 36, located along the edges
28 and 30. The remaining ones of tufts 36, located on the other
edges, i.e., edges 22 and 24, of the lawn element 12 and those
tufts located within the interior of the lawn element 12, may not
be provided with such central openings. As a result, when pins 26
extend through the openings 34 to form the interconnection between
adjacent lawn elements, the upper surfaces of the pins 26 are
received within the inner concentric circles 34 surrounded by
blades of grass 41 and 43 and are accordingly hidden from view upon
the interconnection of the adjacent lawn elements.
As shown most clearly in FIG. 8, when the adjacent lawn elements
are brought together as for interconnection, the mating scallops 33
and 35 formed on the adjacent interconnected edges of the elements
mate in flush engagement. The resulting sinuous interface between
the adjacent lawn elements improves the appearance of the completed
lawn by eliminating the boxlike appearance obtained by joining
conventional lawn elements having linear edges. The engagement of
the mating scalloped edges also effective to provide uniform
clearance between adjacent lawn elements and to render the
interconnection between adjacent elements less obvious, and hence
improves the natural appearance of the completed lawn. In the
completed lawn, the outer perimeter of the lawn will be defined
only by edges 28 and 30 so that the perimeter will be smooth and
natural, and unmarred by the presence of extending securing
elements such as the tabs 22.
Ribs 46 and bosses 50 on the lower surface 18 of the individual
lawn elements 12, which support the lawn elements as they rest upon
the floor or ground, produce a clearance 62 between the supporting
surface and the underside 18 of the base. Each of the plurality of
tufts 38, except for those arranged directly adjacent to the edges
of the lawn element, is provided with a centrally located drain
hole such as 60, which extends through the entire thickness of the
lawn element 12.
Thus, when liquid (from rain, spilled coffee, or cleaning fluid,
for example) falls upon the upper surface 16 of the lawn element
12, it will not tend to collect between the individual blades of
grass. Instead, it will readily fall through drain holes 60 into
the clearance 62, and from there it can flow through the gaps 48
provided between the ends of adjacent ribs 46, so as to drain away.
Thus, rain or other liquid will not collect on the upper surface or
beneath the lower surface of the lawn elements.
Thus, the artificial lawn of the present invention is made up of a
plurality of readily molded standard elements which may easily be
secured together in an inconspicuous manner so as not to reveal its
sectional nature, so as to approach a real lawn in appearance much
more closely than has heretofore been possible, and so as to permit
drainage of liquids which may fall on the lawn.
While only a limited number of embodiments of the present invention
have been here specifically disclosed, it will be appreciated that
many variations may be made therein without departing from the
spirit and scope of this invention as defined in the appended
claims.
* * * * *