U.S. patent number 3,610,459 [Application Number 04/825,002] was granted by the patent office on 1971-10-05 for magnetic system for retaining dishes on a tray during service.
Invention is credited to Maynard P. Hanson.
United States Patent |
3,610,459 |
Hanson |
October 5, 1971 |
MAGNETIC SYSTEM FOR RETAINING DISHES ON A TRAY DURING SERVICE
Abstract
A combination and structure of serving tray and dishes wherein
between the base areas of the dishes and the upper surface area of
the tray are interposed permanent magnet elements secured to one of
said surfaces, and thin sheets of magnetic metal secured to the
other of said surfaces. In both instances (securing of the magnetic
elements and securing of the metal elements respectively) the
elements are preferably coated and covered and sealed to the said
surfaces by thin coatings or laminations of plastic material.
Inventors: |
Hanson; Maynard P.
(Minneapolis, MN) |
Family
ID: |
25242863 |
Appl.
No.: |
04/825,002 |
Filed: |
May 15, 1969 |
Current U.S.
Class: |
220/23.83;
428/900; 206/818 |
Current CPC
Class: |
A47G
19/10 (20130101); A47G 23/06 (20130101); Y10S
206/818 (20130101); A47G 2200/106 (20130101); Y10S
428/90 (20130101); A47G 2023/0666 (20130101) |
Current International
Class: |
A47G
19/00 (20060101); A47G 19/10 (20060101); A47G
23/06 (20060101); A47G 23/00 (20060101); A47g
019/10 (); B65g 021/00 () |
Field of
Search: |
;206/DIG.33 ;335/303
;248/26A ;220/23.83,69 ;224/48 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Schwartz; Raphael H.
Claims
What is claimed is:
1. In combination with a serving tray having at least a substantial
supporting area constructed of a magnetic metal and two types of
dishes to be supported thereon, conventionally having in use
concentrically stacked relation when served, such as cups and
saucers,
cooperating magnetic dish-retaining means comprising,
for each saucer-type dish, an annular upwardly extending recess
formed in its base, and a dual-functioning, permanent annular
magnet element embedded in the said annular recess in he base of
the saucer-type dish and being substantially concentric with the
configuration thereof, and having a diameter somewhat less than the
diameter of the base of said saucer-type dish, and comprising for
each of said cup-type dish a similar annular recess in the base
portion thereof and a magnetic metal annular element embedded in
the annular recess in the base portion of the cup-type dish and of
substantially similar diameter to said permanent magnet element and
disposed concentrically above said permanent magnet element when
said saucer-type and cup-type dishes are conventionally stacked and
supported upon said tray,
the coercive force of said permanent magnet element being adequate
to retain said saucer-type dish upon said metallic area of said
tray and being also adequate to retain said cuplike dish against
slippage or displacement upon said saucerlike dish when stacked as
set forth.
Description
This invention relates generally to the serving of a number of
different dishes on a tray for restaurant, institution, cafeteria
and home use; has particular use as a magnetic system or apparatus
for retaining a plurality of dishes on a tray while loading the
tray with filled dishes, and during transport of the tray to the
table.
It is an object of my present invention to provide simple and
economic media for use on serving trays and dishes which when
carried out within the scope of my invention, will comply with all
public health standards and which enable the dishes and tray to be
washed and rinsed in conventional apparatus without deterioration
thereof; and which in operation will prevent the dishes from
sliding, spilling or overturning on a tray during transportation
and service.
More specifically it is an object to provide between the base areas
of dishes and the upper surface of the tray, thin, permanent magnet
elements in predetermined locations with metallic magnetic inserts
on the other surfaces, to retain the dishes in predetermined
relation on the tray during transportation and service, and which
furthermore, readily enables the filled dishes to be removed from
the tray. The permanent magnets may be in the form of thin wafer
Alnico magnets attached to the upper surface of an ornamental
serving tray and covered with a sealed coating or a thin layer of
suitable plastic material. In such cases the dishes will have
impregnated in the bases thereof, a ring or disc or a magnetic
metal such as steel. Conversely the tray may be mainly constructed
from a magnetic metal and if desired, covered with a thin coating
of plastic and the dishes in the base portions thereof very close
to the contact with the tray, will carry very thin, annular,
magnetic strips having the properties of a permanent magnet. These
magnetic strips or wafers will be covered with a coating or thin
layer of suitable plastic sealed within the base of the dishes.
My invention, its uses and advantages, will be more fully apparent
from the following description made in connection with the
accompanying drawings wherein like reference characters refer to
similar parts throughout the several views and in which:
FIG. 1 is a small scale, perspective view showing one form of my
invention where the tray has a number of permanent magnet strips or
wafers secured thereto and covered by a plastic coating;
FIG. 2 is a partial plan view of FIG. 1 with at least one of the
dishes removed from the tray, and showing in dotted lines the
positioning of the permanent magnets on the tray for maximum
efficiency in attracting the metal-impregnated dishes;
FIG. 3 is a cross section taken on the line 3--3 of FIG. 2;
FIG. 4 is a bottom plan view showing another form of my invention
where an annular magnetic tape is impregnated in the bottom of a
dish for use with a metal tray;
FIG. 5 is a vertical section taken along the line 5--5 of FIG. 4
and showing the dish supported on a tray;
FIG. 6 is a vertical section showing a third form of the invention;
and
FIG. 7 is a section taken on the line 7--7 of FIG. 6 showing
distribution of magnetic particles in the base portion of a cup or
dish.
Referring now to the form of the invention illustrated in FIGS. 1
to 3 inclusive, a tray which for the most part may be constructed
of sheet metal or a filled plastic composition or the like, is
illustrated as of annular form having an upturned peripheral edge
5. To the upper surface of this tray are secured as by adhesive or
plastic bonding, a multiplicity of permanent magnetic wafers M
arranged generally in spaced parallel relation with a space between
said magnets being preferably less than three-fourths of an inch.
Some of the magnets may extend at right angles to others in the
general arrangement. The arrangement of the magnets is such that
the base of any conventional dish deposited upon the tray will
overlie one or more of the magnetic wafers M.
After the permanent magnet strips or wafers M are secured to the
upper tray surface, the same are coated, together with the
uncovered portions of the tray top, with a lamination or coating L
of a suitable plastic material such as polyethylene, vinyl or the
like. The coating of course covers and fills the spaces between the
magnets and produces a smooth planar upper surface which is
completely sealed with the upturned peripheral wall 5 of the
tray.
The term "dishes" as used herein, is meant to include all
conventional receptacles for holding and containing solid or liquid
foods such as plates, cups, tumblers, bowls, and the like.
As shown in FIG. 4, a dish 6 has a circular base which is provided
with a shallow circular recess in which an annular or disc insert 7
is contained, constructed of a magnetic metal such as mild steel or
sheet iron. The insert is filled and the metal completely covered
by a plastic lamination or coating 8. Similarly the other dishes
employed are provided with shallow, concentric recesses to receive
the magnetic metal inserts which are covered by plastic laminations
8.
In use, when the specially constructed dishes are filled with food
and positioned upon the tray T, they are retained by magnetic force
from the permanent magnet wafers M and will be held in the said
positions while the tray is transported to its destination for
service of the food. The magnetic force exerted is not impeded by
the thin plastic sealing laminations L and 8, but will function to
hold the dishes against sliding even though the tray may be tilted
to an angle of 45.degree. from the horizontal. Since the permanent
magnets and the metal inserts are sealed by plastic with the
surfaces to which they are attached, the dishes and tray may be
processed normally in conventional dishwashing machines.
Referring now to the form of my invention illustrated in FIG. 5,
the tray T is constructed of a metal having magnetic properties,
such as sheet iron or mild steel, and is preferably covered at its
upper surface with a layer or lamination of thin plastic material
L.
As shown, a cup and saucer C and S respectively, are supported upon
a portion of the tray. The saucer S has a circular base which has a
shallow recess of circular concentric form, in which is attached a
permanent magnet 10 preferably of annular shape, which may be
constructed from Alnico permanent magnet material, or from a
magnetic tape. This magnet 10 is secured in the recess portion of
the base by bonding or adhesive, and is then covered, together with
the filling of the recess within the annular magnet, by a thin
layer of plastic material 11.
The cup C has its base shallowly recessed and in this recess is
secured a disc or annulus of metal 12, such as sheet iron, having
magnetic qualities. The metal and recess are then covered and
coated with a layer of plastic material 13 which acts as a seal for
the recess and the metallic material therein. Cup C is held in
concentric relation with saucer S by the annular permanent magnet
10 of the saucer S.
It will of course be understood that a somewhat similar cup and
saucer relation may be utilized with the form of my invention first
described, where however the saucer S is merely provided in its
recess base portion with a metallic annulus and the cup is of the
same structure as shown in FIG. 5. The cup and saucer in this
instance of course will be magnetized and then retained due to the
permanent magnets M of wafer form in the first-described tray
T.
In FIGS. 6 and 7, still another form of the invention is
illustrated wherein the tray T-2 may be identical with the tray T-1
shown in the form of FIGS. 4 and 5, being basically metal from
magnetic metal such as steel, preferably coated at top and bottom
with a suitable smooth plastic. The dishes utilized in combination
with this tray, such as the plastic cup C-1 have their base
portions in the actual molding of the plastic cup impregnated with
magnetic particles of permanent magnet strength, such as is
utilized in the so-called permanent magnet tapes. In the sectional
view of FIG. 6, the periphery, upper edges, and upper portion of
the bottom of cup C-1 is molded by injection, preferably from a
central sprue from plastic alone. When these portions of the mold
cavities are filled, a plastic material in powdered or semiliquid
form is injected in the remaining and bottom portion of the mold to
form the bottom proper 15, having embedded therein a multiplicity
of minute, permanent magnet particles p. The procedure and method
described is perfectly feasible and may be successfully and
commercially utilized for producing dishes of various types with
bottom portions molded from an intimate admixture of the plastic
ingredients with the finely divided, very small discrete magnetic
particles.
It is to be understood where in the appended claims the terms
"impregnated with permanent magnet material" are used, such is
meant to include material such as wafers, rings, sheets, permanent
magnets of wafer or shaped type, as well as fine permanent magnet
particles which are carried by, sealed within, and in fact
impregnated in either the tray or the dish base.
From the foregoing it will also be seen that I have discovered and
provided simple but highly efficient magnetic media interposed
between the base portions of dishes, and a generally conventional
type of tray, which through magnetic attraction cause the dishes to
remain in place after they are deposited in filled condition upon
the tray, and when the tray is moved for transportation. The
drawing power of the magnets selected, will be such as to retain
the filled dishes in place during transportation of the tray, even
though the tray may be angled from 20.degree. to 45.degree. from
the horizontal. However, the magnet effect is sufficiently mild to
enable the filled dishes to be readily lifted from the tray during
serving.
It will be understood that various changes in the shape,
arrangement and equivalencies of the parts may be made, provided
the same are within the combinations defined in the claims of this
application, all within the scope of the invention.
* * * * *