PLASTIC PRY-OFF PAINT CAN ASSEMBLY
An all plastic paint container assembly comprising a container, a ring assembly attached to the rim of the container and a pry-off plastic closure having a dual sealing arrangement with the ring member and an undercut lock at a location which provides maximum circumferential area and lies directly under the highest point on the closure. Containers of this design can be stacked both with and without the ring members attached. Three embodiments are disclosed, providing double and triple closure locks and multiple seals.
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This application is a continuation of U.S. application Ser. No. 12/765,257 filed under attorney docket no. LTC-138-B on Apr. 22, 2010, currently pending, which application is a continuation-in-part of U.S. application Ser. No. 12/540,585 filed under attorney docket no. LTC-138-A on Aug. 13, 2009, currently pending. The content of the U.S. patent application Ser. Nos. 12/765,257 and 12/540,585 are incorporated herein by reference.
FIELD OF THE INVENTIONThis invention relates to containers and more particularly to a container assembly which is particularly well suited for paint and which comprises a pry off plastic closure sealingly nested into a ring attached to the top rim of a container.
BACKGROUND OF THE INVENTIONPaint cans and lids have been traditionally been made of steel. There are a number of disadvantages associated with steel paint cans including cost, weight, a propensity to rust, and disposal issues.
As a result, a number of steps have been taken toward the development of plastic container assemblies for paint. In general, such an assembly comprises the container itself, an annular ring adapted to be attached to the top rim of the container and defining an upwardly opening U-shaped channel to receive a closure, and a closure or lid having an annular feature which is formed to complementally fit into the upwardly opening U-shaped channel in the ring member to produce a seal. An example is shown in U.S. Pat. No. 6,588,618 assigned to Letica Corporation of Rochester, Michigan.
SUMMARY OF THE INVENTIONThe present invention provides a container assembly of the type generally described above but having a number of features and advantages over prior plastic container assemblies.
According to a first aspect of the invention, the ring assembly adapted to be attached to the top rim of the container has an upwardly opening U-shaped channel defined by inner and outer radially spaced concentric walls. The closure comprises an inner deck portion and a “corrugated” peripheral portion defining annular inner, middle, and outer walls, all made integral with one another by radial, curved bridge sections, and defining both an outermost upwardly opening U-shaped channel at an innermost downwardly opening or “inverted” U-shaped channel. The upwardly opening channel defines a smooth, annular surface which is complemental to and fits nestingly within the upwardly-opening U-shaped channel of the ring member whereas the inverted U-shaped channel receives the upstanding innermost end wall of the ring member and provides seals on both inner and outer surfaces thereof to prevent paint or other contained fluid from entering the space between the two complemental U-shaped channels.
In accordance with a further aspect of the invention, a closure adapted to fit complementally into a snap ring as described above wherein a downwardly-extending lip is added to the radially outermost element of the closure. This lip extends downwardly toward, but does not touch the top surface of the ring just inside of the rim-engaging portion and provides several advantages hereinafter described.
In accordance with a still further aspect of the invention, an undercut-type lock is formed between the outermost wall of the closure and the outer wall of the ring assembly thereby locating the lock in that portion of the overall combination of components which has the largest circumferential dimension thereby giving the lock greater surface area and improving drop test performance. In addition, locating the lock in this area takes advantage of the natural spring effect between the ring member and the outer wall of the closure thereby making it easier to remove the closure. However, in an alternative embodiment, an additional lock may be provided between the inner surface of the inner ring wall and the adjacent closure wall. In this embodiment, multiple locks and multiple seals are provided. The term “lock” is used herein to refer to an undercut, interference fit between two radially adjacent plastic walls which makes disengagement of those walls from one another more difficult, but not impossible, to achieve. This term is commonly used in this manner in the plastic container technology.
In accordance with a further aspect of the invention, the bottom of the pail or container is formed with a downwardly projecting annular tongue and, radially outwardly thereof, an annular groove. The radius of the annular groove is such that, when two such containers are stacked atop one atop the other, before the ring member is attached to the container, the top rim of the container fits into the grove and enhances the stackability of the two containers. At the same time, the downwardly projecting annular tongue fits into a radial gap between the closure and a step formed between the peripheral portion of the ring member and the outer wall of the ring member so as to provide a laterally stable stacking relationship between two containers when a ring member is attached to the bottommost container in the stack. Therefore, as a result of the invention, assembled containers can be stacked both with and without attached ring members while lateral stability in the stack is provided.
The description herein makes reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views, and wherein:
Referring to
In accordance with the invention, an annular ring member 20 is secured to the top rim 18 of the container 12 by means of adhesive. Again, other attachment methodologies may be used including spin welding, heat welding and snap-tight interference fits.
The ring member 20 comprises a peripheral portion 22 having a downwardly opening annular groove 23 which is adapted and sized to receive the upper rim portion 18 of the container side wall 14 therein. The ring member 20 further comprises a radially innermost portion defining an upwardly opening U-shaped channel having a radially outer annular wall 24 and, concentric therewith, a radially inner annular wall 26. The walls 24, 26 are made integral by means of a bight or bridge section 27. A step 28 on the inside of the peripheral portion 22 results in a recessed land 30 which leads into an undercut tab 34 on the inner surface of the outer wall 24 to provide a lock between the ring 20 and a closure 36, hereinafter described. Ring member 20 projects outwardly from the wall 24 at 32 into contact with the inner surface of the container sidewall 14 when the ring member 20 is in place on a container 12 as shown in
Continuing with the description of
The complemental second half of the undercut lock is provided by means of a tab 48 formed on the outer surface of the outer closure wall 44 so as to interfit with the tab 34 to provide an undercut lock of large circumferential dimension when the upwardly opening U-shaped channel 36 is complementally interfit into the upwardly opening U-shaped channel of the ring member 20. The lock 34, 48 lies directly under the flange 46. The flange 46 extends to the topmost plane of the closure as shown in
The leg 40 is made to have a slightly greater radius than the unbraced leg 26. Thus, a first seal 50 is formed by firm radial contact between the radially innermost wall 26 of the ring member 20 and the inner surface of the inner radially innermost wall 40 of the closure 36 when the closure is pressed into position in the ring member 20. A second seal is formed by close and firm radially contacting relationship between the inner surface of the innermost wall 26 of the ring member 20 and an annular tab 52 on the middle wall 42 of the closure 36. This dual seal arrangement prevents paint from entering into the space 54 between the ring member 20 and the closure 36 thus providing a cleaner paint-free closure when it is first removed from the container by the end user. The closure channel does not bottom out in the ring channel before the lock 34, 48 engages.
Referring now to
As shown in
Referring to
Referring to
In
-
- (1) it adds structural strength to the closure;
- (2) it aids in securing an opening tool such as a pry bar to remove the closure 36a from the ring; and
- (3) it acts as a splash guard when replacing the closure 36a on the ring 20a in the event paint has collected in the U-shaped channel just to the left of the ring section 20a shown in
FIG. 9 (also shown at 54 inFIG. 2 .)
It will be understood that the invention has been described with reference to a specific embodiment thereof and with various features, proportions and dimensions of the embodiment shown can be changed without departing from the spirit and scope of the invention.
Claims
1. A cylinder assembly comprising:
- a straight-sided cylindrical container with a closed bottom and an integral side wall forming an annular top rim;
- an annular plastic ring having a peripheral portion defining an inverted U-shaped channel adapted to receive and be secured to said top rim, and an integral inner portion forming an upwardly opening U-shaped ring section defining an outer annular wall and an unbraced inner annular wall, the space between said ring walls forming a deep, upward opening annular channel for receiving a complemental annular closure channel; said ring having a radial land between said peripheral portion and said outer wall;
- a plastic closure configured to fit into said ring and having an inner deck bounded by an annular portion having inner, middle and outer annular walls, the inner and middle walls forming said complemental closure channel, and the middle and outer walls forming an upwardly opening U-shaped annular channel; said closure channel being dimensioned to fit sealingly into the upwardly opening ring channel to close and seal said container assembly, said outer annular closure wall terminating in an integral, radially outwardly-extending flange that overlies said land in spaced relation thereto when said closure is sealingly applied to said ring; no part of said closure being higher than the top of said flange;
- an undercut lock formed between the outermost closure wall and the outermost ring wall; said undercut lock lying directly under said flange; and
- said closure and ring being configured to produce sealing contact between both sides of the outer ring wall and both inner surfaces of said inverted U-shaped closure.
2. An assembly as defined in claim 1 further including a downwardly-extending lip on said flange to act as a splash guard when reapplying said closure to said ring.
3. A container assembly as defined in claim 1 wherein said upwardly opening U-shaped closure channel being complemental to the U-shaped channel of said annular plastic ring so as to fit sealingly therein and being of such depth as to engage said undercut lock before the closure channel bottoms out in the ring channel;
4. A container assembly as defined in claim 3 further comprising a radial clearance between the flange and the peripheral ring portion.
5. A pry-off plastic container assembly as defined in claim 1 wherein the container bottom has radially adjacent inner annular tongue and outer annular groove portions, said tongue fitting into said radial clearance when stacked with the container having a ring member attached, said groove receiving the rim in stacked relationship when containers are stacked without a ring member attached.
6. A pry-off plastic container assembly as defined in claim 1 further including a second undercut lock between the middle wall of the closure and the outer surface of the inner ring wall.
7. A pry-off plastic container assembly as defined in claim 1 further including a second undercut lock between the inner wall of the closure and the outer surface of the inner ring wall.
8. A plastic container assembly comprising:
- a container having a closed, integral bottom, and a generally cylindrical sidewall integral with said bottom and terminating in an unflanged upper rim;
- a ring member attached to the top rim of the container by way of an inverted U-shaped channel structure which fits over and onto the unflanged top rim of the container, said ring member defining radially inwardly of said inverted U-shaped channel a recessed land integral with an annular structure having, in section, a U-shaped channel with outer and inner walls;
- said container assembly further comprising a closure having a central deck portion and an inverted U-shaped peripheral structure having an outer edge flange and which fits matingly and sealingly into the U-shaped channel of the ring member between the outer and inner walls of said ring member;
- an undercut lock between the outer wall of the closure and the inner surface of the outer wall of the ring member; and
- a container bottom defining an upwardly extending recess which, when the container is stacked atop another similar container, is located to receive therein the rim structure of a similar container with no ring member attached thereto, the bottom structure further having radially inwardly spaced from said recess a downwardly projecting annular rib structure which extends parallel to the ring member rim structure toward the recessed land to laterally stabilize a container stacked atop another container with a ring member attached thereto.
9. A plastic container assembly as defined in claim 8 wherein said closure is configured such that the edge flange has substantially directly over said undercut lock and no part of said closure, when applied to an upright container, is higher than said edge flange.
10. A plastic container assembly as defined in claim 9 wherein the ring member is configured to have a radial land adjacent and below the plant of said channel structure to form a clearance with said edge flange when the closure is sealingly applied to the ring member.
11. A molded plastic paint can comprising:
- a plastic container having a closed bottom and a cylindrical sidewall integral with the closed bottom and terminating in a circular rim;
- a plastic ring member attached to said rim and defining a U-shaped channel spaced radially inwardly of said rim by an annular land which lies in a plane below said rim;
- a plastic closure having a peripheral structure forming a U-shaped channel that fits sealingly within the U-shaped channel of said ring, said peripheral structure including an outwardly extending flange that overlies said land in spaced relation to form a pry area;
- an undercut lock formed by and between the outermost annular mating surfaces of its ring member and closure channels directly under said flange;
- the top of said flange lying in the highest plane of said closure when applied to said ring member.
12. The paint can defined in claim 11 wherein a downwardly projecting annular lip is formed on the outer edge of said flange.
13. A plastic container combination comprising:
- a one-piece plastic container having a closed bottom and an open top with a circular rim;
- a plastic ring member attached to the top rim and defining a U-shaped channel radially inwardly of said rim; and
- a closure having a multi-planar upper surface and a U-shaped channel that fits sealingly into the U-shaped channel of the ring member;
- first and second radially spaced undercut locks formed between said ring member and said closure; both of said undercut locks directly underlying points on the surface of the closure that lie in the highest plane of the closure.
Type: Application
Filed: Nov 21, 2012
Publication Date: Mar 28, 2013
Applicant: LETICA CORPORATION (Rochester, MI)
Inventor: LETICA CORPORATION (Rochester, MI)
Application Number: 13/682,888
International Classification: B65D 43/02 (20060101); B65D 1/16 (20060101); B65D 21/02 (20060101);