U.S. patent application number 09/909986 was filed with the patent office on 2002-05-09 for pail and lid assembly.
Invention is credited to Bartlett, Glenn J., Cormier, Claude, Harvey, Peter, Mills, David.
Application Number | 20020053569 09/909986 |
Document ID | / |
Family ID | 24840868 |
Filed Date | 2002-05-09 |
United States Patent
Application |
20020053569 |
Kind Code |
A1 |
Mills, David ; et
al. |
May 9, 2002 |
Pail and lid assembly
Abstract
A pail and lid with an integral handle molded with the lid
includes a pail side wall extending upwardly from the pail bottom
to an upper peripheral edge. The lid includes a cover portion
shaped to cover the open top and a peripheral skirt depending from
said cover portion, said skirt having an upper annular portion and
a lower annular portion and both shaped to surround an outer
surface of the pail side wall at or adjacent the upper edge and
separated by a peripheral tear strip. The handle is integrally
formed with said lower portion for carrying the pail. The skirt and
pail have co-operating upper and lower pairs of retaining lips
shaped to snap over each other by downward movement of the cover
portion onto the pail to hold the cover portion on the pail. The
skirt is sufficiently stiff to allow both snap actions to be
effected simultaneously be pressure downwardly from the cover. The
lower pair provide greater retaining force such that, prior to
pulling the tear strip, co-operation of said lower retaining lip of
the peripheral skirt and said lower retaining lip of the pail
provides a strong force in maintaining the cover portion on the
pail and such that, upon tearing, co-operation of said lower
retaining lip of the peripheral skirt and said lower retaining lip
of the pail substantially prevents upward vertical displacement of
said lower portion and the handle thereon relative to said pail so
that the handle can accept high loads.
Inventors: |
Mills, David; (Winnipeg,
CA) ; Cormier, Claude; (Winnipeg, CA) ;
Harvey, Peter; (Brampton, CA) ; Bartlett, Glenn
J.; (Winnipeg, CA) |
Correspondence
Address: |
ADE & COMPANY
1700-360 MAIN STREET
WINNIPEG
MB
R3C3Z3
CA
|
Family ID: |
24840868 |
Appl. No.: |
09/909986 |
Filed: |
July 23, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09909986 |
Jul 23, 2001 |
|
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09707230 |
Nov 6, 2000 |
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Current U.S.
Class: |
220/212.5 ;
220/276; 220/773 |
Current CPC
Class: |
B65D 2401/20 20200501;
B65D 2543/00518 20130101; B65D 2543/00796 20130101; B65D 2543/00629
20130101; B65D 43/0256 20130101; B65D 2543/0074 20130101; B65D
2543/00296 20130101; B65D 2543/00555 20130101; B65D 2543/00685
20130101; B65D 2543/00092 20130101; B65D 2543/00537 20130101; B65D
25/32 20130101 |
Class at
Publication: |
220/212.5 ;
220/276; 220/773 |
International
Class: |
B65D 025/32; B65D
017/40 |
Claims
1. A container comprising: a pail comprising: a pail bottom; a pail
side wall extending upwardly from the pail bottom to an upper
peripheral edge spaced from the bottom and defining inwardly of the
peripheral edge an open top; an upper outwardly facing retaining
lip extending around the pail side wall at or adjacent the upper
edge; and a lower outwardly facing retaining lip disposed about the
pail side wall below the upper outwardly facing retaining lip; and
a lid assembly for the pail comprising: a cover portion shaped to
cover the open top; a peripheral skirt depending from said cover
portion, said skirt having an upper annular portion and a lower
annular portion and both shaped to surround an outer surface of the
pail side wall at or adjacent the upper edge; an upper inwardly
facing retaining lip extending around said upper portion adapted to
co-operate with said upper outwardly facing retaining lip of the
side wall to retain said cover portion and said upper portion on
said pail; a lower inwardly facing retaining lip extending around
said lower portion adapted to co-operate with said lower outwardly
facing retaining lip of the side wall to retain said cover portion
and said lower portion on said pail; a handle integrally formed
with said lower portion for carrying the pail; and a tear strip
connecting said upper portion to said lower portion which is
tearable around the peripheral skirt to separate the lower portion
from the upper portion; the upper retaining lip of the peripheral
skirt being shaped to snap over the upper retaining lip of the pail
side wall by downward movement of the cover portion onto the pail
to hold the cover portion on the pail; and the lower retaining lip
of the peripheral skirt being shaped to snap over the lower
retaining lip of the pail side wall by downward movement of the
cover portion onto the pail to hold the cover portion on the pail
such that, prior to detachment of said upper portion from said
lower portion, co-operation of said lower retaining lip of the
peripheral skirt and said lower retaining lip of the pail assists
in maintaining the cover portion on the pail; and such that, upon
detachment of said upper portion from said lower portion,
co-operation of said lower retaining lip of the peripheral skirt
and said lower retaining lip of the pail substantially prevents
upward vertical displacement of said lower portion and the handle
thereon relative to said pail.
2. The container according to claim 1 wherein the upper and lower
retaining lips are arranged such that both retaining lips of the
lid assembly snap over the respective retaining lip of the pail
side wall by downward movement of the cover portion substantially
simultaneously.
3. The container according to claim 1 wherein the skirt including
the tear strip is sufficiently stiff to cause the communication of
forces from the cover portion through the skirt and the tear strip
to cause the lower retaining lip of the lid assembly to snap over
the lower retaining lip of the pail.
4. The container according to claim 1 wherein the retaining lips
are arranged such that a pulling force necessary to effect
separation of the lower retaining lips is greater than a force
necessary to effect separation of the upper retaining lips.
5. The container according to claim 1 wherein pail side wall is
tapered downwardly and inwardly from the top edge to the bottom to
allow stacking of the pail inside another identical pail.
6. The container according to claim 1 wherein an inside surface of
the pail side wall up to and including the top edge is tapered.
7. The container according to claim 1 wherein the lower retaining
lip of the pail is formed on an outside surface of a beam ring on
the outside of the side wall.
8. The container according to claim 7 wherein the bearing ring
includes a shoulder which abuts the lower portion to prevent
dropping of the lower portion on the pail when the tear strip is
disconnected.
9. The container according to claim 7 wherein there are provided a
series of angled guide surfaces between the outside surface of the
pail side wall and the raised band for guiding downward movement of
lower portion of the skirt.
10. The container according to claim 1 wherein the upper retaining
lip of each of the lid assembly and the pail is formed by a single
ring.
11. The container according to claim 1 wherein the handle extends
around the peripheral skirt from a hinge coupling at one side to a
generally opposed hinge coupling at the other side and wherein the
handle is connected to the lower portion of the skirt at the hinge
couplings and at least at two additional points angularly spaced
around the skirt, the additional points being frangible to allow
the handle to be rotated about the hinge couplings.
12. The container according to claim 11 wherein the handle follows
the skirt at a substantially constant distance from the skirt.
13. The container according to claim 11 wherein the handle is wider
at a center position spaced from both hinge couplings.
14. The container according to claim 1 wherein the lid assembly has
an annular skirt extending downwardly along the inside surface of
the side wall of the pail which has a lower edge for contacting the
inside surface so as to form a seal therewith.
Description
[0001] This application is a continuation-in-part of application
Ser. No. 09/707,230 filed Nov. 6, 2000.
[0002] This invention relates to a pail and lid assembly. More
particularly, the invention relates to a pail and lid assembly
wherein the lid has an integral handle for carrying the pail.
BACKGROUND OF THE INVENTION
[0003] Pails made from polymers such as polyethylene and
polypropylene have been used for many years for the transportation
and storage of a wide variety of liquid and bulk solid materials.
Once filled, these pails are usually fitted with a lid to prevent
spillage of the contents and to prevent exposure of the contents to
the external environment. It is important that the lid be securely
fitted on the pail until the user desires to access the contents.
It is also important that the user be able to remove the lid
without undue effort and without the aid of any mechanical device
or tool. Tear strips are commonly used to facilitate removal of
lids which are securely applied to containers.
[0004] Often pails are printed and/or labelled to provide
information concerning their contents. Generally, the pails are
printed before they have been filled, and labelled after they have
been filled. When the contents of the pail are date sensitive, it
is particularly preferable to label the pails after they have been
filled. The labels can then be printed to indicate the date the
contents were made or a "best before" date.
[0005] It is advantageous that pails have a handle to facilitate
manual lifting and carrying. It is known to fit pails with molded
plastic handles. An example of such a handle is disclosed in U.S.
Pat. No. 4,357,042 (Gall) issued Nov. 2, 1982. In that example, the
handle assembly has a sleeve adapted to fit around the perimeter of
the pail and abut against a shoulder adjacent its upper rim. A
horizontal flange extends outwardly from the lower edge of the
sleeve and the handle is attached to opposite sides of the flange.
The handle assembly is installed on the pail by placing the sleeve
around the bottom of the pail and sliding the sleeve upwards until
it abuts the shoulder.
[0006] Another example of this type of handle assembly is disclosed
in U.S. Pat. No. 4,387,922 (Geisinger) issued Jun. 14, 1983. The
handle assembly disclosed in that patent has a continuous band
which fits around the perimeter of the pail and abuts the upper rim
of the pail. The handle is attached to opposite sides of the band.
The handle assembly is applied to the pail by positioning it on top
of the pail and applying downward force causing the band to expand
and snap over the upper rim of the container.
[0007] One of the drawbacks of this type of handle is that the
handle assemblies must be produced separately from the pails and
lids. The handle assemblies must be stored until they are ready to
be installed on the pails and that storage must be managed.
Furthermore, the installation of the handles on the pails is an
additional step in pail production which, in turn, reduces the
efficiency of the process and thereby lowers productivity.
[0008] More commonly, it is known to use wire handles. These may be
button or offset type wire handles whereby each end of the wire
handle is inserted through a hole or into a standoff on opposed
sides of the pail. In either case, the pail must be molded to
account for the application of the wire handle. Wire handles are
preferably attached to the pails immediately after they have been
molded and while the pails are still warm.
[0009] There are numerous disadvantages inherent in the use of wire
handles. Firstly, the wire handles must be purchased by the pail
producer and the inventory of wire handles must be stored and
managed. The installation of the wire handles on the pails is also
time consuming and adds considerably to the cost of producing the
pails. In addition, after the pails have been produced they are
often nested so that they can be stored and transported to the
filler in the most efficient manner possible. The wire handles are
problematic when the pails are de-nested because they are prone to
catch on the rims of the pails below. The wire handles also cause
difficulties during printing and labelling of the pails because
they obstruct access to the pail side wall. Mechanisms have been
developed to maintain the handles away from the side wall, however,
such mechanisms add considerably to the expense and complication of
both the printing and the labelling processes. In addition, the
mechanisms are prone to mechanical failure which, in turn, reduces
productivity.
[0010] Some attempts have been made to integrate the handle and the
pail by molding them together. These attempts have been generally
unsuccessful and have been limited to small sized containers due to
difficulties encountered during the molding process.
[0011] Thus there is a need for a pail and lid assembly which
incorporates a handle and which can be produced, stored, printed,
labelled and filled without the disadvantages inherent in prior art
pail and lid assemblies.
[0012] In U.S. Pat. No. 4,834,252 (Crisci) issued May 30, 1989 is
disclosed a construction of a bottle with a threaded cap on a neck
of the bottle. The cap has a flexible depending skirt with a tear
strip which can be torn around the neck to leave a collar on the
bottle. The collar carries a loop shaped handle by which the bottle
can be carried. There is no disclosure as to how the cap and skirt
are attached to the bottle.
SUMMARY OF THE INVENTION
[0013] In the pail and lid assembly of the present invention, the
lid incorporates a handle which, once the lid has been applied to
the pail, is effective to carry the pail. The peripheral skirt of
the lid has a retention band which is connected to the cover
portion of the lid by a removable tear strip. The lid is applied to
the pail by the application of downward force on the lid which
causes the skirt to expand and snap into place over the upper
extremity of the pail side wall. The retention band is prevented
from upwards and downwards displacement on the pail by the
co-operation of retaining means on the retention band and the pail.
The handle is attached to the retention band. Prior to the removal
of the tear strip, the retention band is effective to securely
retain the lid on the pail and to anchor the handle to the pail.
Once the tear strip has been removed, the lid is no longer securely
retained on the pail and can be manually removed. The retention
band, however, remains effective to anchor the handle to the pail
and the handle can thus continue to be used for the remainder of
the useful life of the pail.
[0014] The handle is molded integrally with the lid and thereby
obviates the need for the separate production and installation of a
pail handle. The handle is also molded in such a manner that when
it is not in use, it lies in its resting position which is radially
adjacent to the retention band. As a result, the handle does not
obstruct access to the pail side wall during any printing or
labelling which takes place after the lid has been applied to the
pail.
[0015] Thus, in accordance with the present invention there is
provided a container comprising:
[0016] a pail comprising:
[0017] a pail bottom;
[0018] a pail side wall extending upwardly from the pail bottom to
an upper peripheral edge spaced from the bottom and defining
inwardly of the peripheral edge an open top;
[0019] an upper outwardly facing retaining lip extending around the
pail side wall at or adjacent the upper edge;
[0020] and a lower outwardly facing retaining lip disposed about
the pail side wall below the upper outwardly facing retaining
lip;
[0021] and a lid assembly for the pail comprising:
[0022] a cover portion shaped to cover the open top;
[0023] a peripheral skirt depending from said cover portion, said
skirt having an upper annular portion and a lower annular portion
and both shaped to surround an outer surface of the pail side wall
at or adjacent the upper edge;
[0024] an upper inwardly facing retaining lip extending around said
upper portion adapted to co-operate with said upper outwardly
facing retaining lip of the side wall to retain said cover portion
and said upper portion on said pail;
[0025] a lower inwardly facing retaining lip extending around said
lower portion adapted to co-operate with said lower outwardly
facing retaining lip of the side wall to retain said cover portion
and said lower portion on said pail;
[0026] a handle integrally formed with said lower portion for
carrying the pail; and
[0027] and a tear strip connecting said upper portion to said lower
portion which is tearable around the peripheral skirt to separate
the lower portion from the upper portion;
[0028] the upper retaining lip of the peripheral skirt being shaped
to snap over the upper retaining lip of the pail side wall by
downward movement of the cover portion onto the pail to hold the
cover portion on the pail;
[0029] and the lower retaining lip of the peripheral skirt being
shaped to snap over the lower retaining lip of the pail side wall
by downward movement of the cover portion onto the pail to hold the
cover portion on the pail
[0030] such that, prior to detachment of said upper portion from
said lower portion, co-operation of said lower retaining lip of the
peripheral skirt and said lower retaining lip of the pail assists
in maintaining the cover portion on the pail;
[0031] and such that, upon detachment of said upper portion from
said lower portion, co-operation of said lower retaining lip of the
peripheral skirt and said lower retaining lip of the pail
substantially prevents upward vertical displacement of said lower
portion and the handle thereon relative to said pail.
[0032] Preferably the upper and lower retaining lips are arranged
such that both retaining lips of the lid assembly snap over the
respective retaining lip of the pail side wall by downward movement
of the cover portion substantially simultaneously.
[0033] Preferably the skirt including the tear strip is
sufficiently stiff to cause the communication of forces from the
cover portion through the skirt and the tear strip to cause the
lower retaining lip of the lid assembly to snap over the lower
retaining lip of the pail.
[0034] Preferably the retaining lips are arranged such that a
pulling force necessary to effect separation of the lower retaining
lips is greater than a force necessary to effect separation of the
upper retaining lips.
[0035] Preferably pail side wall is tapered downwardly and inwardly
from the top edge to the bottom to allow stacking of the pail
inside another identical pail, although other shapes of container
pail portion can be used which do not allow stacking.
[0036] In the above shape, an inside surface of the pail side wall
up to and including the top edge is tapered without any inwardly
extending projections or ribs.
[0037] Preferably the lower retaining lip of the pail is formed on
an outside surface of a raised band on the outside of the side wall
and the raised band includes a shoulder which abuts the lower
portion to prevent dropping of the lower portion on the pail when
the tear strip is disconnected. In this arrangement, there are
provided a series of angled guide surfaces between the outside
surface of the pail side wall and the raised band for guiding
downward movement of lower portion of the skirt.
[0038] Preferably the upper retaining lip of each of the lid
assembly and the pail is formed by a single ring.
[0039] Generally the handle extends around the peripheral skirt
from a hinge coupling at one side to a generally opposed hinge
coupling at the other side where the handle is connected to the
lower portion of the skirt at the hinge couplings. In addition, the
handle may be attached to the skirt at least at two additional
points angularly spaced around the skirt, the additional points
being frangible to allow the handle to be rotated about the hinge
couplings. These are provided to allow increased flow of plastics
material into the handle to ensure that no voids are allowed.
[0040] Preferably the handle follows the skirt at a substantially
constant distance from the skirt.
[0041] Preferably the handle is wider at a middle position spaced
from both hinge couplings than the relatively narrow band forming
the remainder of the handle so as provide a relatively wide strap
which can be laid onto the hand of the user.
[0042] The lid assembly may have an annular skirt extending
downwardly along the inside surface of the side wall of the pail
which has a lower edge for contacting the inside surface so as to
form a seal therewith, or other sealing arrangements may be
provided such as a gasket at the top edge.
BRIEF DESCRIPTION OF THE DRAWINGS
[0043] FIG. 1 is a top plan view of a pail and lid assembly
according to the present invention.
[0044] FIG. 2 is a cross sectional view of the pail and lid
assembly of FIG. 1 taken along the lines 2-2.
[0045] FIG. 3 is a cross sectional view of the pail and lid
assembly of FIG. 1 taken along the lines 3-3.
[0046] FIG. 4 is a cross sectional view of the pail and lid
assembly of FIG. 1 taken along the lines 4-4.
[0047] FIG. 5 is a side elevational view of the lid with the handle
in position for use.
[0048] FIG. 6 is a side elevational view of the lid showing the
lead end of the tear strip.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0049] The pail and lid assembly of the present invention includes
a pail component 12 and a lid 30. The pail 12 has a beam ring 14
which extends circumferentially around the top of the pail near its
upper edge. Beam ring 14 has upper portion 16 which extends
outwardly and downwardly from pail 12 and lower portion 18 which is
vertical. A plurality of evenly spaced beam ribs 20 are disposed on
the underside of beam ring 14 and connect pail side wall 22 to the
inwardly facing surface of beam ring 14. Side wall 22 may be
tapered or cylindrical. Tapering of side wall 22 from top to bottom
facilitates nesting of a plurality of empty pails. Top opening 24
and bottom surface 26 are generally circular.
[0050] Beam ring type pails are well known in the container
industry. The beam ring provides structural reinforcement to the
top of the pail and prevents inward collapse of the pail opening.
This, in turn, permits the thickness of the side walls to be
reduced relative to the side wall thickness of conventional pails.
Although a beam ring type pail has been described, it should be
understood that the present invention can be used with other types
of pails. For instance, the invention can be used with pails which
have an outwardly projecting rim at the top of the pail side wall
and which are known by those in the art as "satellite ring pails"
or "open head" pails. Also, the invention is not limited to pails
having circular openings. For example, pails with oval, square,
rectangular, or any other polygon or rounded shape can be used.
[0051] The lid 30 may incorporate any conventional sealing means
including, but not limited to, a gasket system, an internal flange
or friction fit. Lid may also incorporate any conventional form of
auxiliary opening in cover portion including, but not limited to,
flex spouts, vents, threaded closures and tear-outs.
[0052] The pail and lid components are preferably made from
polyethylene or polypropylene. Other suitable polymeric materials
can be used depending on the nature of the materials to be
contained.
[0053] Pail 12 and lid 30 are molded by injection molding or blow
molding in a manner well known to those skilled in the art. As
indicated above, handle is molded integrally with lid. Once molded,
pail 12 is filled with its liquid or bulk solid contents and lid is
placed over pail opening 24.
[0054] Turning now to the cross section shown in FIG. 2, the pail
12 includes the pail bottom 26 and the pail side wall 22. The pail
side wall is inclined upwardly and outwardly to the top edge 23 and
defines a smooth tapered inner surface which is free from inwardly
projecting ribs or other obstructions which would interfere with
the pail being stacked inside another pail. The outside surface of
the side wall 22 is also smooth and frusto-conical up to the beam
ring 14 which projects outwardly from the outside surface so that
the stacking of two such pails occurs such that the upper edge 23
sits underneath the bottom of the ribs 20 of the beam ring in the
stacked position.
[0055] The beam ring 14 is defined by a horizontal top flange 35
which projects outwardly from the outer surface of the side wall to
an outer edge 36. The beam ring 14 further includes a generally
vertical wall 18 which extends downwardly from the flange 35 to a
bottom edge 40. The generally vertical wall 18 is thus spaced
outwardly from the side wall 22 and forms an annular band
surrounding the side wall of an increased diameter relative to the
side wall.
[0056] The lid 30 includes a cover portion 38 and a surrounding
skirt 29 having a handle 31 which closely follows the curvature of
a band 32 defined by the lower portion of the skirt 29. Thus, where
the pail 12 and thus the cover 38 and skirt 29 are circular, the
handle is semicircular, extending from the integral flexing hinge
33 at one end to an identical hinge 34 at the other end. The handle
31 is spaced equidistantly around its periphery from the outside
surface of the band 32.
[0057] In addition to the coupling between the band 32 and the
handle at the hinges 33 and 34, there may be also provided at least
two additional couplings 75 and 76 in the form of tabs extending
across the space 37 between the band 32 and the handle 31. These
couplings 75 and 76 act to hold the handle in a common plane with
the band 32 when not in use. In addition these couplings 75 and 76,
if provided, act to provide a flow path for the plastics material
during the injection molding of the lid structure including the
handle. Thus the plastics material in the mold enters through the
center of the circular cover 38 of the lid and then extends into
the skirt and particularly the band 32 and finally passes through
the coupling defined by the hinges 33 and 34 and the tab coupling
75 and 76 into the handle to flow into that portion of the mold
defining the handle. It is well known that a weak point of a
structure such as the handle is formed at the interconnection where
plastics flow from two different directions joins or welds to
integrate the structure. Thus plastics material flowing through the
couplings from the band 32 into the handle meets primarily at the
center section 39 of the handle symmetrically between the hinges
and between the couplings 75 and 736. The handle may be increased
in volume at the center section 39 so that as shown in FIG. 4 its
depth in the vertical direction is increased thus forming a flat
strap surface on the inside for engaging the hand of the user. The
thicker portion at the center section 39 thus has the advantages of
providing a wider surface for the hand of the user and in addition
provide an increased amount of plastics material at this point thus
overcoming the weaker section at the joiner by increasing the
thickness at this point.
[0058] The hinge couplings 33 and 34 extend along a part of the
band 32 and are connected at an inner edge to the band 32. The
hinge couplings terminate at a position 33C where the handle
commences and are integral with a handle band portion 33A which
extends around the band 32 spaced outwardly therefrom as shown in
FIG. 3. A V-groove 33B is provided in the top of the band 33A
adjacent each hinge coupling to act as a bending point of the band
33A so it can take up a right angle position as shown in FIG.
5.
[0059] The center section 39 may also be modified to provide two
additional wings extending from the center outwardly in an arcuate
path around the handle to increase the amount of material at the
center and thus improve the welding action.
[0060] Underneath the flange 35 at the outer edge 36 is provided an
annular shoulder 41 which is located outside the vertical wall 18
and underneath the flange 35 against which the band 32 abuts. At
the bottom edge 40 is provided a rib 42 which projects outwardly
and thus provides a horizontal shoulder 43 on which the band 32
sits to prevent the band 32 from dropping downwardly when the tear
strip is torn away. This shoulder 43 can also be provided at the
top of the beam ring to cooperate with an upper portion of the band
32.
[0061] The band 32 at its upper edge has an inwardly turned lip or
projection 32A which forms a retaining lip for co-operating with
the flange 35. The shoulder 41 also defines with the outer edge 36
and outwardly extending retaining lip 36A of the pail wall. Thus
the retaining lips 32A and 36A co-operate in the closed position to
locate the lower band 32 in position on the side wall to hold the
band in place against upward vertical movement.
[0062] The lower band 32 in connected to an upper band 44 by the
tear strip 45. The upper band 44 includes and inwardly turned
retaining lip 44A which engages an outwardly turned retaining lip
23A at the upper edge 23. Thus the retaining lips 23A and 44A form
an upper retaining element surrounding the periphery of the pail
for locating the skirt on the pail. The retaining lip 44A can be
continuous or intermittent and can be designed to provide an amount
of retention force sufficient for the end use required.
[0063] It will be noted that the lip 23A provides a bottom surface
which is inclined upwardly and outwardly so that the force
necessary to pull the lip 44A over the lip 23A to remove the
engagement therebetween is relatively small. To the contrary the
lips 32A and 36A provide butting surfaces at or close to right
angles to the upward movement necessary to separate those elements
so that the force necessary to pull the lip 32A over the lip 36A in
the upward direction is significantly greater.
[0064] Underneath the lip 23A, the wall 22 has its outer surface
22A recessed from the lip 23A and recessed relative to the outer
edge 46 of the band 44 thus defining an open area underneath the
lip 23A and above the flange 35. The upper surface of the flange 35
is horizontal. At spaced positions around the periphery there may
be provided a plurality of inclined ramp surfaces 46 which connect
the outside surface 22A to the outer edge 36 of the flange 35.
These act, if provided, as centering elements so as to ramp the
bottom edge of the band 32 into position when the band is applied
onto the pail in a vertically downward movement as described
hereinafter.
[0065] From the lip 44A, the upper band 44 is inclined downwardly
and outwardly to a bottom edge 44B which is spaced outwardly from
the outer surface 22A and spaced upwardly from the flange 35.
Between the bottom edge 44B and the top edge 32B of the band 32 is
provided the tear strip 45. The thickness of the tear strip is
reduced at the side edges of the tear strip that is at its
connection with the edges 44B and 32B. The tear strip 45 is
inclined outwardly and downwardly from the edge 44B to the edge
32B.
[0066] The skirt including the upper band 44, the tear strip 45 and
the lower band 32 is shaped and arranged so that the lid can be
applied onto the pail by vertically downward movement onto the pail
and by pressure applied at the top of the skirt, that is at the
junction between the skirt and the cover portion 38. Thus the skirt
is stiff and allows forces to be communicated from a point P
downwardly through the skirt 29 to the bottom edge of the lower
band 32. In operation, therefore, with the pail filled, the lid is
applied onto the pail and the band 32 surrounds the edge 23 and is
pushed downwardly around the outside surface 22A of the pail until
the bottom edge of the lower band 32 engages the ramps 46. These
ramps 46 guide the lower edge of the band 32 onto the outer edge 36
of the flange 35 so that the lower band 32 passes over the outer
edge 36 and can be pushed downwardly. During this pressure at the
point P, the skirt is sufficiently stiff to communicate the
necessary forces from the point P, through the skirt 29 into the
lower band to force the lower band downwardly until the lip 32A
sits on top of the lip 36A. At this point the lip 44A sits on top
of the lip 23A. Further downward pressure at the point P therefore
acts to simultaneously snap the lip 32A over the lip 36A into the
retaining engagement and also to force or snap the lip 44A over the
lip 23A to provide its retaining engagement.
[0067] The high retaining force of the lower retaining element
defined by the lips 32A and 36A ensures that the lid remains in
place on the pail until the tear strip 45 is pulled away.
[0068] The cover 38 is generally horizontal but includes a
downwardly depending surrounding skirt 38A which extends downwardly
along the inside surface 22C of the pail side wall. The skirt 38A
includes a lower blade portion 38B which is inclined outwardly so
as to provide pressure against the inside surface 22C in a sealing
action.
[0069] With the lid applied, the connecting tabs 75 and 76 can be
broken simply by manually grasping the handle section at the center
portion 39 and pulling upwardly. Thus the handle can be pulled
upwardly, as shown in FIG. 5, to a position in which it extends
generally vertically upwardly from the hinges 33 and 34 so that the
pail, lid and handle can be manually carried by the user. The high
retention force provided by the aggressive action between the lips
32A and 36A insures that the weight of the pail and its contents is
not sufficient to pull the handle and the lid from the beam ring
14.
[0070] When the user requires access to the contents, the tear
strip 45 is grasped at its molded end location or pull tab 45A
(FIG. 6) and is torn around the skirt to separate the upper band 44
from the lower band 32. The tearing action occurs at the thinner
sections at the edges 32B and 44B.
[0071] When torn away, the lower band 32 remains in place and is
fixed by the high retention forces underneath the lip 36A on the
beam ring 14. The bottom edge 44B is exposed and spaced outwardly
from the outside surface 22A and above the beam ring 14 so that it
can be manually grasped by the fingers of the user. The relatively
low retention force at the upper retaining lips allows the upper
band 44 and the cover portion to be pulled upwardly releasing the
lid from the pail. The lid however can be replaced on the pail
simply by pushing back onto the pail so that the snap action of the
upper lips retains the upper band 44 in place and the sealing skirt
38A in place around the upper part of the side wall of the
pail.
[0072] Although the pail and the lid are preferably circular at the
open top of the pail, other shapes can also be used including oval
and square. In a square pail, the corners will necessarily be
relatively rounded to avoid sharp changes in direction which can
generate high forces at the junction. In a square pail arrangement,
the hinges of the handle are located at the corners and the handle
generally follows the outside surface of the pail so that it is
also generally rectangular providing a manually graspable section
at the corner in between the hinges.
[0073] The pails can conveniently be nested. Two or more beam ribs
may have beam rib extensions (not shown) which are sized to
maintain sufficient space between the pails necessary to avoid too
close a fit and the associated difficulty in de-nesting.
[0074] The pail and lid assembly of the present invention provides
a number of important advantages to pail producers, printers and
labellers, fillers and end users. The production of the handle is
integrated with the production of the lid. Thus, the requirement
for a separate process to produce handles or the requirement for
pail producers to purchase wire handles is eliminated. The need to
store and manage a separate inventory of handles for application to
the pails is also eliminated. Further, there is no need to install
handles on the pails. Because the integration of the handle on the
lid does not add appreciably to the cost of producing the lid or to
the efficiency of the lid production process, the production of the
pail and lid assembly of the present invention is significantly
simpler and less costly than the production of prior art
assemblies.
[0075] As mentioned above, empty pails are often stored by nesting
them. When wire-handled pails are nested, the handle of one pail
often drops below the top of the pail below. When the pails are
separated, the wire handle catches on the pail below. The pail and
lid assembly of the present invention avoids this problem because
no handles are applied to the empty pails.
[0076] If printing and labelling take place before the lid is
applied to the pail, the pail and lid assembly of the present
invention is advantageous because there is no need to hold the
handle away from the side wall of the pail. Similarly, in
situations where the pails are printed or labelled after the lid
has been applied, the need to position the handle away from the
side wall of the pail is eliminated. This significantly improves
the efficiency of the printing and labelling processes and obviates
the need to provide mechanisms to retain the handle away from the
pail side wall, which mechanisms add to the cost and complexity of
the printing and labelling procedures. Numerous modifications can
be made to the pail and lid assembly described herein without
departing from the spirit or scope of the invention as defined in
the following claims.
* * * * *