U.S. patent number 3,675,811 [Application Number 04/886,279] was granted by the patent office on 1972-07-11 for vending container with cover therefor.
This patent grant is currently assigned to W. R. Grace & Co.. Invention is credited to Kenneth W. Artz.
United States Patent |
3,675,811 |
Artz |
July 11, 1972 |
VENDING CONTAINER WITH COVER THEREFOR
Abstract
Disclosed is a covered vending container which is divided into
compartments by divider wall ridge members. The divider wall ridge
members describe generally double-curved paths across the bottom of
the container, and rise to a height above the bottom of the
container less than the height of the side walls extending
peripherally therearound. Container strength is enhanced by the
curved paths of the divider walls and by the manner of intersection
between the divider walls and the container side walls. The
container cover is a clear dome provided with denestable stacking
means and corner detent means for engaging the underside of the
flange portion of the vending container. In preferred embodiments,
the tray portion of the vending container is molded foam sheet and
the dome portion of the vending container is clear plastic
material.
Inventors: |
Artz; Kenneth W. (Mohnton,
PA) |
Assignee: |
W. R. Grace & Co. (Duncan,
SC)
|
Family
ID: |
25388771 |
Appl.
No.: |
04/886,279 |
Filed: |
December 18, 1969 |
Current U.S.
Class: |
220/575; 220/784;
206/519; 206/518; 220/556; 229/406 |
Current CPC
Class: |
B65D
43/0212 (20130101); B65D 1/36 (20130101); B65D
81/025 (20130101); B65D 2543/00648 (20130101); B65D
2543/00731 (20130101); B65D 2543/00685 (20130101); B65D
2543/00527 (20130101); B65D 2543/00805 (20130101); B65D
2543/00537 (20130101); B65D 2543/00574 (20130101); B65D
2543/00027 (20130101); B65D 2543/00074 (20130101); B65D
2543/00296 (20130101) |
Current International
Class: |
B65D
43/02 (20060101); B65D 81/02 (20060101); B65D
1/36 (20060101); B65D 1/34 (20060101); B65d
001/36 (); B65d 043/10 (); B65d 021/02 () |
Field of
Search: |
;220/20,22,23.6,23.8,97C,97F,60 ;229/2.5 ;D44/14,16.2 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lowrance; George E.
Claims
I claim:
1. A vending container or the like comprising:
A. a tray, said tray comprising:
1. a bottom,
2. a sidewall extending upwardly from and peripherially around said
bottom,
3. a flange extending outwardly from said sidewall, and
4. a divider wall, said divider wall:
a. comprising a ridge rising from said bottom and projecting to a
height above said bottom less than the height of said sidewall,
said ridge
b. connecting with said sidewall,
c. describing a continuous doublecurved path across said bottom,
and
d. dividing said bottom into at least two compartments, each of
said compartment being defined by a portion of said bottom, a
portion of said sidewall, and a portion of said divider wall;
and,
B. a cover, said cover comprising:
1. a dome-like portion,
2. a ledge extending outwardly and peripherially around said
dome-like portion wherein said ledge is adapted to engage the upper
surface of said tray flange,
3. a skirt depending downwardly from said ledge and extending
peripherially therearound, said skirt adapted to fit over said tray
flange,
4. detent latching means on said skirt for engaging the lower
portion of said tray flange, and
5. stacking lugs associated with the corners of said ledge, said
stacking lugs being located above said latching means.
2. A vending container according to claim 1, wherein said stacking
lugs are box-like members projecting outwardly from the sidewall of
said dome-like portion and extending in a smooth curve into said
cover skirt portion.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a vending container or the like
with a tray portion molded from foam sheet material and a cover
portion molded from clear plastic sheet. More particularly the tray
portion of the container is compartmentized by curving divider wall
members, and the cover portion is rendered denestable by staggered
stacking lugs.
The term vending container is employed herein as a matter of
convenience. It is used to describe various trays, dishes and like
constructions which are adapted to receive food and other
substances into compartments. The term is particularly used to
describe those containers which are first obtained from coin
operated, refrigerated vending machines, and are subsequently
heated in micro-wave type ovens.
The prior art has provided many types of trays and containers for
food applications. Generally, these containers have performed their
functions satisfactorily. However, certain difficulties with
containers and vending trays of the prior art do exist. For
instance, it has been difficult to produce trays which possess
satisfactory rigidity and resistance to cracking and breaking along
stress lines. The cover portions of certain containers of the prior
art have also proved difficult to remove after heating. Another
shortcoming of the prior art which the present invention
substantially obviates relates to the difficulty in removing trays
from the tight confines of compartments ordinarily found in vending
machines. Yet another problem resides in providing stable trays
whose bottom portions resist rocking.
It is therefore a principal object of the present invention to
provide a product wherein the above noted and other difficulties of
the prior art are substantially reduced.
It is another object of the present invention to provide a vending
container having a tray portion made more rigid by the presence of
curving divider walls rising up from the bottom of said tray.
It is a further object of the present invention to provide divider
walls which rise from the bottom of the tray to a height less than
the height of the side wall members of said tray.
It is yet one other object of the present invention to provide a
vending container having a clear plastic dome with detent means
located at the corners thereof.
It is yet one more object of the present invention to provide a
vending container having a clear plastic dome with staggered
stacking means centered directly above the detents which improves
detent rigidity over prior art detent design.
SUMMARY OF THE INVENTION
In solving the problems of the prior art several novel features
have been discovered. Discussed broadly, certain of these novel
features are as follows:
1. It has been found that the strength of container trays may be
enhanced by providing generally double curved divider walls which
rise above the bottom of the tray less than the height of the side
wall members of said tray.
The double curve path of the divider wall prevents the flexing
which would occur in hinge-like fashion if a straight-line path
were employed. It has also been found that tray strength and
resistance to damaging flexure is particularly improved when the
divider wall members are made to intersect the tray side wall along
lengthwise segments of the side walls rather than at vertical lines
thereof. Near the intersecting segments, the divider wall peaks are
flared out into gently curving, triangular shaped plateaus with one
side of each triangular plateau comprising the segments of
intersection with the container side wall members. The triangular
plateaus provide areas of opposed stressed bracing in combination
with the sloping sides of the divider wall ridges and the portions
of the side wall members extending upwardly from the intersection
with the triangular plateaus.
2. Triangular shaped, opposed, stressed, bracing areas are also
provided in embodiments wherein intersections exist between two
divider wall ridge members.
3. Container tray rigidity is likewise enhanced by forming the
bottom portion of tray compartments in a generally upwardly
curving, concave configuration. This concave configuration provides
further opposed stress bracing areas.
The edge or peripheral bottom portions of each compartment are
constructed to lie in the same plane. The coplanar edges of the
compartment bottoms thereby provide a stable platform for resting
the trays on flat surfaces.
4. The cover portion of the vending container, which is likewise
provided with novel features, basically comprises a raised dome
section, a ledge element extending outwardly and peripherally from
the lower area of the dome portion, and a skirt portion depending
downwardly from the ledge element. At each corner of the skirt,
inwardly projecting detent means are formed to engage with the
under side of the tray flange member. Stacking means are provided
at each corner of the cover and extend outwardly from the lower
wall of the dome portion and downwardly in a smooth curving plane
into the skirt portion of the cover member.
In the cover member, the skirt portion extends a considerable
distance below the ledge of the tray member. This extension
provides space for the detent means, and a gripping area for
removing the vending container from vending machine compartments or
the like. This provision also provides a larger cover opening for
slipping over the flange of the container tray portion.
Novel stacking means or lugs are provided at each corner of the
cover member, and are located directly above the detent latch
means. These lugs prevent locking of a stack of container covers by
being staggered in location from one container to the next and also
aid in denesting. In this manner the underside of the ledge of one
container rests on the top portion of the stacking lugs positioned
directly therebeneath in the stack of containers.
For economy's sake a minimum number of basic cover configurations,
(with respect to lug location), are preferred. Preferably, the lugs
of one cover configuration are spaced somewhat further apart, or
alternatively closer together, than the lugs of another
configuration. Therefore, in a stack of container covers the
various types of covers lie in alternate spacing within the
stack.
5. Benefit has also been found in selecting particular materials
for use in the cover member and tray portion of the vending
container. It has been found that clear plastic material is best
employed as the cover member from both decorative and utility
standpoints. Molded foam sheet is most advantageously employed in
the tray portion. Special benefit is derived when using foam sheet
which has been laminated to clear plastic sheet. The clear plastic
side is used on the inside of the container tray. The primary
purpose of the clear laminate is to provide an insulator or barrier
between hot food and the foam portion of the tray. Otherwise, the
foam will become distorted and transfer an offensive taste and odor
to the food. This provision also enhances appearance by providing a
glossy surface, and aids in utility by providing a smooth hard
surface for the removal of food items with utensils.
6. Other benefits and advantageous aspects of the present invention
will become obvious to those skilled in the art from the following
Brief Description of the Drawings and Discussion of the Preferred
Embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a three compartment vending container
formed in the manner of the present invention.
FIG. 2 is an elevation view of the vending container shown in FIG.
1.
FIG. 3 is a sectional view of the edge portion of the vending
container shown in FIG. 1 along line 3 -- 3.
FIG. 4 is a sectional view of the divider wall ridge member of the
vending container shown in FIG. 1 along line 4 -- 4.
FIG. 5 is another sectional view of the divider wall ridge member
of the vending container shown in FIG. 1 along line 5--5.
FIG. 6 is another sectional view of the edge portion of the vending
container shown in FIG. 1 along line 6 -- 6.
FIG. 7 is a sectional view of the bottom of the vending tray shown
in FIG. 1 along line 7 -- 7.
FIG. 8 is a plan view of a two compartment vending container.
FIG. 9 is a plan view of three cover members arranged in a nesting
stack.
FIG. 10 is a sectional view of the container covers shown in FIG. 9
along line 10 -- 10.
DISCUSSION OF THE PREFERRED EMBODIMENT
The following embodiments, which are discussed with particular
reference to FIGS. 1 and 10, relate to the principal or preferred
aspects of the present invention. Two general container
configurations are shown. Likewise, two compartment, and three
compartment trays are shown, as are the denestable arrangement for
stacked container covers. Although these embodiments and particular
details are preferred, other arrangements and details falling
within the scope of the invention may be easily inferred, and are
in some cases specifically noted.
Referring now to FIG. 1, I have shown a three compartment vending
container 11 in plan view. The tray portion is bound peripherally
by side wall members 12, from which extend flange members 13. The
tray is divided into three compartments by divider wall ridges 14
and 15. In combination with the side walls 12, the divider wall
ridges 14 and 15 form compartments 16, 17 and 18.
Referring to FIG. 2 a cover member 19 is shown disposed onto the
tray portion of the vending container 11. The cover comprises a
dome portion 20, a peripherally extending ledge member 21, (also
see FIG. 1), and a skirt member 22 depending downwardly from the
ledge member 21. Stacking lugs or bosses 23 are located at each
corner of the cover. Beneath each stacking boss 23 is an inwardly
projecting detent latch member 24. The latch member 24 engages the
underside 25 of the tray of flange 13.
In FIG. 1 the triangular shaped intersecting lands or plateaus
between divider wall ridge members and between intersecting divider
wall ridge members are shown. Plateaus 26 join the upper portions
of ridge members 14 and 15 with side wall 12. Plateau 27 lies at
the junction between divider wall ridge members 14 and 15.
Various novel aspects and preferred configurations exist for the
elements noted. For instance, the overall length of container tray
11 should be somewhat greater than the overall length of cover
member 20. Conversely the width of the tray should be somewhat less
than the width of the cover member. These differences in width and
length are primarily intended to form a more secure fit between the
cover member 20 and the tray 11.
In being snapped over the tray, the cover is somewhat distended
along its length and shortened across its width. This preferential
flexing causes the leading portions 28 of detent means 24 to engage
more securely with the under side 25 of tray flange member 13.
This length and width differential between container tray and
container cover is somewhat critical. For example, in a tray whose
configuration is similar to that shown in FIG. 1 and whose overall
length and width dimensions are approximately 7.304 by 5.628 inches
a cover portion is preferred whose overall interior length and
width dimensions are 7.268 by 5.618 inches. Thus, the tray overall
length is 0.036 inches greater than the interior length of the
cover. Still referring to FIG. 1 it is also somewhat desired that
the stacking lugs or bosses and the detent latching means are
located generally at the corners of the containers as shown.
Another preferred aspect shown in FIG. 1 is the relationship
between the tray flange lengths at the ends and sides of the tray.
It is generally preferred that the lengths 29 are greater than the
lengths of the tray flange 30. This is preferred for several
reasons. One is to provide more surface area at the ends of the
trays for engagement with the detent latch means 24, and the other
is to provide finger grip removal areas at the underside 25 of the
tray flange, and between the cover skirt 22 and the tray's side
wall 12. Consequently, the widest flange portion should be provided
at the ends of the tray which are intended to face outwardly from
the vending container compartment. In typical applications 0.5
inches of space is provided between the cover skirt 24 and the
outside portion of the tray side wall 12.
Additional novel aspects and preferred configurations of the
present invention may be best appreciated by referring to sectional
representations of various features of the tray of FIG. 1 as shown
in FIGS. 3 and 7.
FIG. 3 is a sectional view of the container tray side wall 12, a
portion of the container dome 20, the stacking lug 23, and detent
latch means 24. The four detent latch means 24, as seen in FIG. 1,
and as pictured sectionally in FIG. 3, are the primary
instrumentalities for retaining the container cover on the
container tray. These detent latch means are essentially inwardly
projecting segments formed in the container cover skirt 22,
generally at the corners thereof. The detents comprise upwardly and
inwardly projecting walls 47, an innermost projecting peak 28 and a
somewhat downwardly projecting engaging surface 31. The engaging
surface 31 contacts and engages the lower portion 25 of the tray
flange 13. This engaging surface acts as a cam to force the tray
flange into a locked position. The engaging surface 31 proceeds in
a more acute angle from the cover skirt 22 than the lower wall 30.
In this manner the detent latch means may be easily disengaged from
the bottom portion 25 of the tray flange 13 by outwardly applied
finger pressure at the bottom of the cover skirt. The engaging
surface 31 of detent latch 24 should protrude inwardly a sufficient
amount to securely engage the lower portion of the tray flange. The
detent latch 24 should also extend a sufficient distance around the
periphery of the cover corner to insure adequate engagement with
the tray flange underside. In a typical application the engaging
surface 31 extends 0.085 inches inwardly from the skirt and is
0.500 inches long.
Still referring to FIG. 3 the stacking boss or lug 23 is shown
extending outwardly from the cover dome 20 and downwardly into a
smooth plane into the cover skirt 22. The same plane angle or slope
of the surface of the skirt 22 continues with the front wall of the
lug 23. In a typical application the lug protrudes 0.281 inches up
from the top of the cover ledge 21.
In FIG. 4 a section of the divider wall ridge 14 is shown. This
section is typical for both divider wall ridges 14 and 15 in areas
other than those near intersections with one another, or the tray
sidewall. The divider wall, in section, is comprised of curving
peak portion 32, and outwardly sloping side walls 33 depending
therefrom. The sloping walls 33 of the divider wall form an opposed
stress bracing area and thus greatly add to the strength of the
container bottom. As seen in FIG. 4 the intersections 34 between
side walls 33 and tray bottoms 16 and 18 are in the form of arcuate
joints. This feature is advantageous because it prevents the
trapping of food which would be the case with straight line
intersections. Arcuate joints also add to the strength of the
container. For this reason it is generally preferred that all
intersections between plane surfaces of both the container tray and
the container cover are in the form of arcuate joints.
Referring now to FIG. 5 a sectional view is shown whereby the
plateau-like, triangular shaped intersecting land 26 between
divider wall 14 and container tray wall 12 is revealed. As
previously indicated, these intersecting lands are intended to
increase the strength and resistance to damaging flex of the
container tray. In the section shown, divider wall ridge 32 flares
outwardly and upwardly to form triangular land 26. Triangular land
26 is a gently curving plateau which rises upward from divider wall
14 to intersect side wall 12 in a somewhat curving segment 36
thereof. The intersection 36 as shown lies below the top portion of
the side wall 12. The side walls 33 of divider wall 14 follow the
curve of the triangular land 26 to intersect side wall 12 along
lines 37 and thus form additional opposed stress bracing areas 38
and 39. These opposed stress bracing areas in addition to similar
opposed stress bracing areas prevent damaging flex, particularly
flex directed inwardly from the container sidewalls.
Referring to FIG. 6 an additional section is shown. This section
particularly refers to the divider wall ridge 15, the container
cover skirt 22, and the intersection plateau 26. The ledge of the
container cover 21 rests on the upper surface of the container tray
flange 13. The container cover skirt 22 is shown engaged with the
end portion of the container tray flange 13. The skirt 22
preferably extends sufficiently below the flange 13 to provide a
finger grip space 40 and to provide area for the detent latch means
24. In typical applications the container cover skirt 22 projects
0.500 inches below the edge of the flange 13.
In FIG. 6 the divider wall ridge 15 is shown rising to a height
above the container tray bottom less than the height of the
container tray flange 13. This is necessary in order to provide the
upward curving plateau-like intersecting land 26 between the
divider 15 and the container tray side wall 12. In typical
applications the divider wall rises 0.662 inches above the
container bottom and the tray flange rises 0.975 inches above the
container bottom.
In FIG. 7 the somewhat upward curving concave tray bottom 16 is
shown in sectional representation. This upward curvature, which in
a typical application is a one sixteenth inch concave bow, serves
multiple functions. One benefit of the curving surface is that it
provides additional opposed stress bracing areas and thus further
increases tray strength. Another benefit of this configuration is
that it allows container trays to rest with greater stability on
flat surfaces such as tables or vending machine shelves. This is
due to the fact that only the tray bottom edges 41 actually rest on
a supporting surface. It is thought easier to render such edges
coplanar than to form an absolutely flat bottom surface.
In FIG. 7 it is also pertinent to discuss the configuration of the
container cover 20. The dome of the container cover, (whose other
elements have been previously noted), should rise to a height above
the container tray sufficient to enclose but not contact the
articles contained therein. In typical applications the container
cover is 1.500 inches high between the bottom edge of the cover
skirt and the top of the dome.
Proceeding to FIG. 8, a two compartment vending container is shown.
This container is similar in its essential aspects to the vending
container shown if FIG. 1. The principal differences are that only
one divider wall ridge 42 is employed, and that the sides 43 and 44
converge from long end 45 to short end 46. It is obvious that other
containers similar to those shown in FIGS. 1 and 8 may likewise be
constructed and yet fall within the broad scope of the present
invention.
In FIGS. 9 and 10 I have shown 2 covers 19A, 19B and of the type
employed in the container pictured in FIG. 1. The covers as seen
are identical except for the placement of the stacking lugs or
bosses 23 a and 23 b.
These stacking lugs are positioned so that lugs 23 a are staggered
with respect to 23 b. This allows the ledge 21 b of the upper
container to rest on the lugs 23 a of the bottom container. If the
lugs were directly superimposed in the stack they would tend to
project into one another and to thereby cause the tray to be
extremely difficult to denest. It will be readily appreciated that
for economy's sake a minimum number of basic cover configurations,
(with respect to lug location) are preferred. In one typical
application two cover styles as shown in FIGS. 9 and 10 are
produced. Thus, in a stack of container covers, the tray styles
with respect to lug location would alternate in this manner: 23 a,
23 b, 23 a, 23 b, etc. In this typical application the lugs 23 a
are 3.5 inches apart at the end of the cover, and lugs 23 b and 2.0
inches apart at the end of the cover. Still referring to FIGS. 9
and 10 another utilitarian feature of the somewhat long cover skirt
is illustrated. Each cover skirt by extending below the cover ledge
directly therebeneath, reduces the likelihood of a stack of
container covers tipping over.
A variety of materials may be employed in producing containers
which fall within the broad of the scope of the present invention.
However, it is somewhat preferred to employ clear plastic material
in the cover portion of the container and foam material in the tray
portion of the container. Furthermore, in typical application it
has been found worthwhile to employ a clear oriented polystyrene
material between 10 (.010 inches) and 12.5 mils (.0125 inches)
thick and coated with an anti-fog agent. It has likewise been found
beneficial in typical applications to employ foam polystyrene
between 90 (.090 inches and 100 (.100 inches) mils thick in the
container tray portion. This foam material is especially beneficial
when the portion which is to be employed as a container tray inside
surface has been laminated with clear polystyrene between 5 (.005
inches) and 7 1/2 (.0075 inches) mils thick.
These materials when employed in applications as noted herein have
yielded further benefit by providing a container whose cover
portion may be easily removed from the tray section thereof
subsequent to being heated in microwave ovens or the like. It is
hypothesized that preferential shrinkage or expansion occurs which
results in a change in the relative dimensions of the container
tray and the container cover. Subsequent to heating the container
cover appears to grip the container tray less tightly which
facilitates the removal therefrom.
Any appropriate apparatus or device may be employed in molding
vending containers as discussed herein. Such devices are known to
the art and include male and female molding units, vacuum molding
machines, and other similar devices.
* * * * *