U.S. patent number 3,825,145 [Application Number 05/298,469] was granted by the patent office on 1974-07-23 for beer keg.
This patent grant is currently assigned to Huck Finn, Inc.. Invention is credited to Richard W. Reynolds.
United States Patent |
3,825,145 |
Reynolds |
July 23, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
BEER KEG
Abstract
A beer keg having the top, bottom and side walls made of
plastic, and tapper and filler plug mounting members made of
plastic or metal which in one embodiment are cast in position as
the top and side walls are formed. In the second and third
embodiments, the filler plug mounting member is retained in the
central part of the keg mold as the keg is molded and thereafter
mounted in a filler opening formed in the keg.
Inventors: |
Reynolds; Richard W.
(Burnsville, MN) |
Assignee: |
Huck Finn, Inc. (Spring Lake
Park, MN)
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Family
ID: |
26911819 |
Appl.
No.: |
05/298,469 |
Filed: |
October 18, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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217306 |
Jan 12, 1972 |
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58341 |
Jul 27, 1970 |
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Current U.S.
Class: |
220/661; 220/288;
220/675; 220/DIG.1; 220/601 |
Current CPC
Class: |
B65D
1/20 (20130101); B65D 1/16 (20130101); B29C
41/20 (20130101); Y10S 220/01 (20130101); B29C
41/04 (20130101) |
Current International
Class: |
B29C
41/02 (20060101); B65D 1/00 (20060101); B65D
1/20 (20060101); B65D 1/16 (20060101); B29C
41/20 (20060101); B29C 41/04 (20060101); B65d
001/20 () |
Field of
Search: |
;220/1,DIG.1,3,70,72,5R,27,1R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Price; William I.
Assistant Examiner: Pollard; Steven M.
Attorney, Agent or Firm: Dugger, Johnson & Westman
Parent Case Text
RELATED APPLICATIONS
This application is a continuation-in-part application of my
application Ser. No. 217,306, filed Jan. 12, 1972, which in turn is
a continuation-in-part application of my application Ser. No.
58,341, filed July 27, 1970, now abandoned.
Claims
What is claimed is:
1. A container for beer comprising a keg having unitarily
continuous top, bottom and side walls of plastic defining a keg
chamber, one of said walls having an opening therethrough that
opens into the keg chamber and exterior and interior surfaces
surrounding the opening, a mounting member mounted by the one wall
to extend through the wall opening and having a central opening
therethrough, said mounting member having a first annular flange
extending through and outwardly of the wall opening and extending
in close fitting relationship with the wall portion defining said
opening, a second annular flange having an outer diameter
substantially larger than the maximum outer diameter of the first
flange, joined to the first flange and bearing against the wall
interior surface, and a tooth joined to the second flange and
protruding into the wall portion, and a retainer ring mounted on
the second flange and bearing against the wall exterior surface to
clamp the wall portion between said ring and first flange.
2. The apparatus of claim 1 further characterized in that the first
flange extends axially away from the second flange, that the second
flange has a surface portion adjacent the wall inner surface and
that the tooth extends axially relative the second flange in the
same direction as the first flange to a position more closely
adjacent the retainer ring than the second flange surface
portion.
3. The apparatus of claim 2 further characterized in that the tooth
in cross section in a plane parallel to the central axis of the
first flange is substantially triangular and has a terminal apex
more closely adjacent the retainer ring than the second flange.
4. The apparatus of claim 2 further characterized in that there are
provided a plurality of teeth joined to said second flange, said
teeth being angularly spaced and extending radially relative the
first flange.
5. The apparatus of claim 2 further characterized in that said
tooth extends annularly and is of a substantially larger radius of
curvature than the maximum diameter of the first flange.
6. The apparatus of claim 5 further characterized in that the
second flange surface portion is annular and extends between the
tooth and the first flange.
7. The apparatus of claim 6 further characterized in that the
second flange surface portion bears against the wall interior
surface.
8. The apparatus of claim 6 further characterized in that a gasket
is provided between the second flange surface portion and the keg
wall inner surface, the axial height of the first flange being
substantially greater than the tooth.
9. The apparatus of claim 6 further characterized in that the
retainer ring has an annular tooth and an annular surface
surrounded by the ring tooth that bears against the wall exterior
surface, said ring tooth extending more closely adjacent the second
flange than the ring annular surface.
10. The apparatus of claim 9 further characterized in that the
retainer ring has a second annular surface surrounding the tooth,
said ring annular surfaces being generally coplanar, the outer
diameter of the second annular surface being substantially larger
than the outer diameter of the second flange.
11. A container for beer comprising a keg having integrally joined
top, bottom and side walls defining a keg chamber, said walls being
made of unitary formed plastic, said side wall having a portion
defining a plug mounting member opening and said top wall having a
portion defining a tapper plug mounting member opening, a filler
plug mounting member mounted in the side wall opening by said side
wall portion, and a tapper plug mounting member mounted in said top
wall opening in adhered relationship to the top wall portion, said
filler plug mounting member having a first annular flange that has
an annular surface bearing against the inner surface of the side
wall, the first annular flange having an outer diameter greater
than the side wall opening, and a second annular flange integrally
joined to the first flange to extend outwardly through the side
wall opening and having external threads, and a retainer nut
threaded on the second flange to bear against the outer surface of
the side wall, the first flange having a flat surface portion and a
tooth extending axially relative the flat surface portion to a
position more closely adjacent the nut than the flat surface
portion.
12. A container for beer comprising a keg having unitarily
continuous top, bottom and side walls of plastic defining a keg
chamber, one of said walls having an opening therethrough that
opens into the keg chamber and exterior and interior surfaces
surrounding the opening, a mounting member mounted by the one wall
to extend through the wall opening and having a central opening
therethrough, said mounting member having a first annular flange
extending through and outwardly of the wall opening and extending
in close fitting relationship with the wall portion defining said
opening, a second annular flange having an outer diameter
substantially larger than the maximum outer diameter of the first
flange, joined to the first flange and bearing against the wall
interior surface, and a retainer ring mounted on the first flange
and bearing against the wall exterior surface to clamp the wall
portion between said ring and second flange, said ring having an
annular tooth and an annular surface surrounded by the ring tooth
that bears against the wall exterior surface, said tooth extending
more closely adjacent the second flange than the ring annular
surface.
13. The container of claim 12 further characterized in that the
tooth has an apex edge remote from the annular surface.
14. The container of claim 12 further characterized in that said
first flange and ring have threaded portions forming a mating fit.
Description
BACKGROUND OF THE INVENTION
A keg for beer. In the prior art it is old to make metal kegs, for
example for aluminum for storing beer, and provide an opening in
the side wall of the keg and in the top wall of the keg in which a
filler plug mounting member and a tapper plug mounting member are
respectively subsequently mounted. However metal kegs are
relatively heavy, relatively expensive to make, dent relatively
easy and are noisy in handling. In U.S. Pat. No. 2,983,403 to
Mauser there is disclosed a barrel for beer that includes a thin
wall inner shell of metal or synthetic material that at the ends is
provided with reinforcing rings, the shell and rings being covered
by a layer 23 of synthetic material. However, such is not an
integrally formed unit and not as economical to produce as desired.
In order to overcome objections of the above mentioned nature, as
well as others, the present invention has been made.
SUMMARY OF THE INVENTION
A beer keg having plastic top, bottom and side walls that are of
integral unitary construction, and a tapper mounting member cast in
position in the top wall and a filler plug mounted in the side
wall.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of the first embodiment of the beer keg of
this invention;
FIG. 2 is an enlarged fragmentary cross-sectional view of the beer
keg of FIG. 1 showing the joining of the top and bottom walls to
the side wall;
FIG. 3 is an enlarged fragmentary cross-sectional view generally
taken along the line and in the direction of the arrows 3--3 of
FIG. 1 to show the mounting of filler plug mounting member;
FIG. 4 is an enlarged fragmentary plan view generally taken along
the line and in the direction of the arrows 4--4 of FIG. 1 to show
the mounting of the tapper plug mounting member;
FIG. 5 is a fragmentary cross-sectional view generally taken along
the line and in the direction of the arrows 5--5 of FIG. 4;
FIG. 6 is a vertical cross-sectional view of the second embodiment
of the beer keg of this invention, said view being generally taken
along the line and in the direction of the arrows 6--6 of FIG.
8;
FIG. 7 is a top view generally taken along the line and in the
direction of the arrows 7--7 of FIG. 6;
FIG. 8 is a bottom view generally taken along the line and in the
direction of the arrows 8--8 of FIG. 6;
FIG. 9 is a side view of the tapper plug mounting member, said view
being generally taken along the line and in the direction of the
arrow 9--9 of FIG. 10;
FIG. 10 is a top view of the mounting member of FIG. 9, and view
being generally taken along the line and in the direction of the
arrows 10--10 of FIG. 9;
FIG. 11 is a fragmentary view of the filler plug mounting member of
the second embodiment, said view being generally taken along the
line and in the direction of the arrows 11--11 of FIG. 6;
FIG. 12 is a fragmentary view generally taken along the line and in
the direction of the arrows 12--12 of FIG. 11;
FIG. 13 is a view of the retainer ring of the second embodiment
that is generally taken along the line and in the direction of the
arrows 13--13 of FIG. 14;
FIG. 14 is a side view of FIG. 13;
FIG. 15 is a fragmentary cross-sectional view showing the filler
plug mounting member of the second embodiment mounted in the
central portion of the keg as the keg is being formed;
FIG. 16 is a fragmentary cross-sectional view of the third
embodiment of the invention;
FIG. 17 is in part a side view and in part a cross-sectional view
of the filler plug mounting member of the third embodiment, said
view being generally taken along the line and in the direction of
the arrows 17--17 of FIG. 18;
FIG. 18 is a view of the filler plug mounting member of FIG. 17
that is generally taken along the line and in the direction of the
arrow 18--18 of FIG. 17;
FIG. 19 is a view of the retainer ring of the third embodiment,
said view being generally taken along the line and in the direction
of the arrows 19--19 of FIG. 20;
FIG. 20 is in part a side view and in part a cross-sectional view
of the retainer ring of FIG. 19, said view being generally taken
along the line and in the direction of the arrows 20--20 of FIG.
19; and
FIG. 21 is an enlarged, fragmentary cross-sectional view of the
mounting member and gasket thereon.
Referring to FIGS. 1-5, there is shown the first embodiment of the
beer keg, generally designated 10, of this invention. The keg 10
includes an annular side wall 11, a bottom wall 12 and a top wall
14. The top and bottom walls are fixedly joined to the opposite
ends of the side walls whereby there is provided a keg member
13.
In a central portion of the side wall there is provided an annular
mounting member 16. Member 16 has a generally axially extending
annular flange portion 16a that opens through the outer peripheral
surface of the side wall and a radially extending, annular flange
portion 16b having an outside diameter substantially greater than
the outside diameter of flange portion 16a. The plastic material of
the side wall surrounds the radially outwardly, axially extending
surfaces of the mounting member in sealing engagement therewith.
Further the side wall includes an annular portion 11a integrally
formed with the adjacent portions of the side wall that covers a
substantial part of the axially inner, radially extending surface
of the mounting member. Thus flange portion 16b, other than for its
juncture to flange portion 16a, is embedded in plastic material on
all sides thereof. The filler member 16 has a central aperture
opening into the keg for filling the keg.
Mounted by the central portion of the top wall 14 is the tapper
plug mounting member 20. Tapper member 20 has an axially extending,
annular flange portion 20a and a radially enlarged flange portion
20b integrally joined to the axially inner end of flange portion
20a. Thus the outer diameter of flange portion 20b is substantially
larger than the outer diameter of flange portion 20a. The plastic
material surrounds and is in sealing engagement wite the exposed
outer peripheral surfaces of flange portions 20a, 20b and at least
a substantial annular portion of the axial inner surface of flange
portion 20b. As may be noted, plastic material 14b extends over the
last mentioned surface. Thus the surfaces of flange 20b are covered
by plastic material; i.e. flange 20b embedded in plastic. Member 20
has a central aperture opening into the interior of the keg. A
pumping attaching portion 20c is joined to flange 20a to extend
axially outwardly thereof, portion 20c having internal grooves (not
shown) to have a tapper plug (not shown) removably secured in
portion 20c.
Referring to FIGS. 6-14, the second embodiment of the beer keg,
generally designated 50, includes a top wall 51, a bottom wall 52
and a side wall 53 that is integrally joined to the adjacent edges
of walls 51 and 52 respectively to form a keg chamber 54. A top
annular flange 57 has its lower edge integrally joined to the top
and side walls at the juncture thereof, the outer edge of flange 57
being at a substantially higher elevation than the maximum
elevation of the top wall. Likewise, a bottom annular flange 58 has
its top edge integrally joined to the bottom and side walls at the
junction thereof, the lower edge of the bottom flange extending to
a lower elevation than the lowermost part of the bottom wall.
Generally radially extending reinforcing flanges 59 are integrally
joined to the top wall to extend thereabove and to flange 57 to
extend radially inwardly thereof at a maximum elevation lower than
the top edge of flange 57. Also radially extending reinforcing
flanges 60 are integrally joined to the bottom wall to extend
therebelow and to flange 58 to extend radially inwardly thereof at
a minimum elevation above the bottom edge of flange 58.
Vertically spaced, exterior annular ribs 63, 64 respectively are
integrally joined to the side wall, the ribs being of the same
size. Other than for flanges 58, 60, the exterior surface of the
bottom wall, and the adjacent part of the side wall that is below
flange 64 has a radius of curvature R emanating from point 65, i.e.
the portion arcuately from line B to line B, is in the shape of a
portion of a sphere. Likewise, other than for flanges 57, 58 and
the filler plug recess, the exterior surface of the top wall and
the adjacent part of the side wall that is above the flange 63 has
a radius of curvature S emanating from point 66. Vertically between
and slightly closer to point 66 than point 65, there is a point 67,
the horizontal dimension X from point 67 to the exterior surface of
the sidewall being slightly greater than the dimensions of radii R,
S,; while the dimension W to the exterior surface adjacent the
junctures of ribs 63, 64 respectively with the side wall (between
the ribs) is slightly greater than the dimension X. Further the
vertical distance from the top of rib 63 to point 66 is about
one-third of the distance from the top of the rib to the bottom of
the rib 64 while the corresponding distance of point 65 is about
two-thirds of said distance between the ribs.
In the vertical central portion of the side wall (between ribs 63,
64), there is provided an annular plug mounting member, generally
designated 70; that includes an annular flange 71 that is of a
substantially larger outer diameter than the externally threaded
reduced diameter annular flange 72 and integrally joined thereto.
The flange 72 extends through a circular aperture in the side wall
portion while flange 71 has a generally flat annular surface 73 to
abut against a flat annular surface of the interior surface portion
of the side wall surrounding flange 72. A plurality of
circumferentially spaced, radially extending teeth 74 are
integrally joined to flange 71 to bite into the side wall to
prevent the member 70 turning relative the side wall. Member 70 has
a frusto-conical plug receiving aperture 77 that is of
progressively smaller cross-sectional areas in a direction toward
the interior of the keg. Further, flange 71 has a tapered surface
76 extending between surface 73 and the axially opposite surface
which forms a close fit with a corresponding surface of the side
wall. A retainer nut 78 is provided to be threaded on flange 72 and
abut against the exterior surface of the side wall to retain member
70 in position on the keg, member 78 having spaced wrench cutouts
78a.
Mounted by the top central portion of the top wall 51 is the tapper
plug mounting member, generally designated 80 (see FIGS. 9 and 10),
that is of the same construction as mounting member 20 except that
the radially enlarged flanged portion is provided with
circumferentially spaced cutouts 81a that the plastic material of
the keg extends into, to prevent rotation of member 80 relative to
the keg. The top wall has a cylindrical recess 51a of a
substantially larger diameter than the outer diameter of the
annular flange portion 81b. The top wall has an inwardly protruding
portion 51b that mounts member 80 with the top surface thereof
recessed with reference to the continuation of exterior surface of
the side wall in which recess 51a is formed. The same portions of
member 80 are surrouned by plastic material of parts of portion 51a
as the portions of member 20 that are surrounded by plastic.
Preferrably a rotocasting process is utilized in making the kegs of
this invention to provide kegs of a single layer of unitary,
continuous walls of plastic joined to one another to enclose the
keg chamber other than for the openings for members 16, 20 and 80.
In order to mount the filler plug member 70 in place with the
surface 73 abutting a corresponding interior annular surface of the
side wall and without the opposite annular surface of flange 71
covered with plastic, the mold 89 used includes a tapered plug 90
having an inner flat surface of a larger area than the outer
surface (see FIG. 15). Suitable attaching members 92 are provided
for removably attaching the plug to the remainder of the mold
whereby selectively the plug 90 is retained in a fixed position on
the mold, and the mold may be removed from the keg while the plug
90 is not removed therefrom. An elongated rod 93 is mounted by plug
90 to extend radially inwardly to the central part of the mold, the
inner end of the rod mounting a block 94 having a frusto-conical
surface to form a close fit with the member 70 wall that defines
the plug aperture 77. Latch members 96 are mounted by block 94 for
releasably retaining member 70 on block 94 but which can be turned
by turning bolts 97 to permit withdrawing the block 94 from member
70.
With powdered or granular uncured plastic material in the mold and
mounting member 70 mounted in the central part of the mold by the
above structure, the mold is simultaneously rotated about two axes
and heated. During the rotation the plastic material adheres to the
mold but not to block 94 or member 70 since they are too cool for
the powder to adhere to. After the rotocasting step, the mold
(other than for plug 91) is removed from the keg, then rod 93
pulled radially outwardly an appropriate distance and thence an
aperture cut in the keg side wall that is only slightly larger than
flange 72. Next rod 93 is further radially moved to pull member 72
to extend outwardly of the keg, bolts 97 turned to release latches
96 and block 94 removed from member 70. Now the retainer nut 78 is
threaded on flange 72 to draw radial teeth 74 into the keg side
wall sufficiently that surface 73 forms a sealing fit with the side
wall. The shape of the mold is such that during the casting step,
the side wall adjacent plug 91 provides an inner keg surface that
subsequently forms a tight fit with the filler plug mounting
surface 76 including a recess into which flange 71 fits.
As an example of the invention and not otherwise as a limitation
thereof, dimensions R and S may be 7-11/32"; dimension W 7-19/32";
dimension X 7-15/32"; the spacing of point 66 from point 65 1-7/8";
the spacing of point 67 from point 65 1-11/16"; and the maximum
outer diameters of each of flanges 57, 58 5-11/32".
Referring to FIGS. 16-21, the third embodiment of the invention
includes a keg that advantageously is of the same construction as
the keg of the second embodiment and includes an annular plug
mounting member, generally designated 110, that is mounted in the
side wall 109 of the keg in the same place that plug 70 is mounted.
Plug 110 has an annular flange 111 that is of a substantially
larger outer diameter than the externally threaded reduced diameter
annular flange 112, flange 112 being integrally joined to flange
111 to extend axially away therefrom. The flange 112 extends
through a circular aperture 113 in the side wall while flange 112
has a generally flat annular surface 114 to abut against a flat
annular surface of the interior surface portion of the keg side
wall surrounding flange 112, provided no gasket 135 is provided.
The axial length of flange 112 is substantially greater than the
thickness of the keg wall portion defining opening 109. An annular
tooth 115 is formed integral with flange 111, surrounds the flat
surface 114, is triangular in cross section parallel to the central
axis of bore 116 which extends axially through plug portions 111,
112, extends away from surface 114 in the same direction that
portion 112 extends away from flange 11, and has an apex remote
from surface 114. The threaded outer surface 112a of flange 112 is
of generally circular cylindrical shape while the adjacent inner
surface of tooth 115 is of a circular cylindrical shape. The
radially outer surface of the tooth and flange 111 advantageously
are co-extensive, frusto-conical and are tapered to extend radially
inwardly in the direction flange 112 extends away from flange 111.
The wall defining plug bore 116 is of a frusto-conical shape and
has a major base remote from flange 111. Spaced notches 120 are
provided in the interior surface portion of flange 111 that define
the part of the bore extending therethrough to cooperate with
projections on a tool for holding the mounting member in position
in the aperture 113 while the retaining ring, generally designated
125, is being threaded thereon. As may be noted in FIG. 17, the
notches 120 terminate adjacent the juncture of flange 111 to flange
112 whereby, when a plug is placed in bore 116, no fluid passageway
is provided to permit fluid escaping through from the keg between
the plug and mounting member. Further, the annular tapered surface
121 of flange 111 corresponds to surface 76 and functions in the
same manner.
The retainer ring, generally designated 125, is of a unitary,
integral construction and has an internally threaded bore 127, the
threads of which form a mating fit with the threads of the outer
surface portion of flange 112. Further, ring 125 has a flat annular
surface 128, an annular tooth 129 having an apex edge remote from
surface 128 that is of substantially the same shape and size as
tooth 114, and an annular flat surface 130 surrounding tooth 129
and substantially coplanar with surface 128, tooth 129 being
radially between surfaces 128, 130. The radially outer portion of
the ring is provided with a plurality of wrench notches 131.
Advantageously a gasket 135 may be provided on the mounting member
to abut against surface 114 and extend between surface 112a and the
adjacent surface of tooth 115, the thickness of the gasket being
substantially less than the axial height of tooth 115 (the maximum
distance the tooth extends away from surface 114).
Preferrably the method of making the third embodiment is the same
as the second embodiment. The nut 125 is threaded onto the mounting
member to tightly clamp the keg side wall portion that extends
therebetween the teeth or locking flanges 115, 129 which extend
toward one another to bite into the side wall portion. Thus, the
locking flanges form annular depressions in the keg side wall
portion with surface portions 128, 130, 114 abutting against the
adjacent surfaces of the keg side wall portion, if no gasket is
provided; or if a gasket is provided surface portions 128, 130 and
the gasket abutting against the surfaces of the side wall portion.
As a result of providing the teeth 115, 129 the side wall portion
cannot pull away from the mounting member whereby fluid could leak
between the side wall portion and the mounting member. It is to be
mentioned the axial height of each of the annular teeth is many
times less than the thickness of the wall portion that they
protrude into.
The filler and tapper plug mounting members of each embodiment
advantageously may be made of metal, for example stainless steel or
aluminum, or the same type of plastic that the walls of the keg are
made of. In making the keg, the filler plug mounting members of the
second embodiment and the tapper plugs of both embodiments are
mounted in position in the mold and then the walls of the keg are
formed whereby said mounting members are at least partially
embedded as above described. Preferrably a rotocasting process is
utilized in making the keg, and that the type of plastic used is a
high-impact polyethylene.
By using preformed plug mounting members and at least partially
embedding them during the wall forming process as referred to
above, such that plastic material extends over both inner and outer
surface portions (relative the keg), a good fluid seal is formed
and the mounting members are firmly held in place. Further there is
provided a durable, relatively light weight keg that can be used in
the same manner as prior art kegs, but that is relatively
inexpensive to produce. Additionally by making a keg of the shape
of the second embodiment, it can be used for storing beer under
higher pressure than the keg of the first embodiment that has the
same wall thickness.
In each of the embodiments, the filler plug aperture may be
modified for receivably retaining a twist-lock type of plug (not
shown).
Further, with reference to the second and third embodiment, the
retainer rings may be secured to the mounting member in a manner
other than by threading. For example, the outer surface 112a and
the inner surface 127 of the mounting member 110 and retainer ring
125 respectively may be smooth and form close mating fits, and with
the thus modified retainer ring in position on the thus modified
mounting member in clamping relationship to wall portion 109, the
retainer ring is welded, riveted, swaged or otherwise fixedly
mounted on the mounting member. Appropriate tools may be used to
hold the retainer ring and mounting member tight clamping
relationship to the keg wall portion 109 while they are fixedly
secured to one another.
By making the kegs of plastic, they do not dent like metal barrels,
and are much quieter when being handled, including during transport
and filling operations.
* * * * *