U.S. patent application number 10/752928 was filed with the patent office on 2004-07-22 for can lid closure and method of joining a can lid closure to a can body.
Invention is credited to Neiner, Christopher G..
Application Number | 20040140312 10/752928 |
Document ID | / |
Family ID | 23812387 |
Filed Date | 2004-07-22 |
United States Patent
Application |
20040140312 |
Kind Code |
A1 |
Neiner, Christopher G. |
July 22, 2004 |
Can lid closure and method of joining a can lid closure to a can
body
Abstract
A preferred embodiment of the disclosed can lid has a center
panel having a central axis that is perpendicular to a diameter of
the outer rim, or peripheral curl portion, of the can lid, an
annular countersink surrounding the center panel, an arcuate
chuckwall extending radially outward from the annular countersink,
an arcuate step portion extending radially outward from the arcuate
chuckwall, a transitional portion extending radially outward from
the arcuate step portion, and a peripheral curl portion extending
outwardly from the transitional portion.
Inventors: |
Neiner, Christopher G.;
(Defiance, MO) |
Correspondence
Address: |
STORM & HEMINGWAY, L.L.P.
8117 PRESTON RD.
STE. 460
DALLAS
TX
75225
US
|
Family ID: |
23812387 |
Appl. No.: |
10/752928 |
Filed: |
January 7, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10752928 |
Jan 7, 2004 |
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10153364 |
May 22, 2002 |
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6702142 |
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10153364 |
May 22, 2002 |
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09456345 |
Dec 8, 1999 |
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6499622 |
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Current U.S.
Class: |
220/619 |
Current CPC
Class: |
B21D 51/32 20130101;
B65D 17/08 20130101; B65D 21/0222 20130101; B21D 51/38 20130101;
B65D 7/36 20130101; B65D 2543/00027 20130101; B21D 51/44 20130101;
B65D 2517/0062 20130101 |
Class at
Publication: |
220/619 |
International
Class: |
B65D 006/28; B65D
008/04; B65D 008/06 |
Claims
I claim:
1. A lid for a can body comprising: a center panel having a central
axis that is perpendicular to a diameter of the outer rim of said
lid; an annular countersink surrounding said center panel; a
chuckwall extending radially outward from said annular countersink,
wherein a line passing through the ends of said chuckwall is at an
angle with respect to said central axis of the center panel of from
about 20.degree. to about 80.degree.; and a peripheral curl portion
having a height less than 0.091 inches extending radially outward
from said chuckwall.
2. The can lid according to claim 1 wherein a line passing through
the ends of said chuckwall is at an angle with respect to said
central axis of the center panel of from about 30.degree. to about
60.degree..
3. The can lid according to claim 1 wherein a line passing through
the ends of said chuckwall is at an angle with respect to said
central axis of the center panel of from about 40.degree. to about
50.degree..
4. The can lid according to claim 1 wherein the height of said
peripheral curl portion is from about 0.04 to about 0.09
inches.
5. The can lid according to claim 1 further comprising a
transitional portion extending radially outward from said
chuckwall, wherein the peripheral curl portion extends radially
outward from said transitional portion.
6. The can lid according to claim 1 wherein said center panel is
substantially flat or planar.
7. The can lid according to claim 1 wherein said center panel is
arcuate.
8. The can lid according to claim 1 wherein said chuckwall is an
arcuate chuckwall.
9. The can lid according to claim 8 wherein said arcuate chuckwall
has a radius of curvature of from about 0.4 to about 1 inch, the
center-point of said radius located below the profile of said
lid.
10. The can lid according to claim 1 further comprising a step
portion extending radially outward from said chuckwall.
11. The can lid according to claim 10 wherein said step portion is
arcuate.
12. The can lid according to claim 1 I wherein said arcuate step
portion has a radius of curvature of from about 0.02 to about 0.06
inches, the center-point of said radius being located above the
profile of said lid.
13. The can lid according to claim 10 wherein said chuckwall is an
arcuate chuckwall.
14. The can lid according to claim 13 wherein a line passing
through the ends of said arcuate chuckwall is at an angle with
respect to said central axis of the center panel of from about
30.degree. to about 60.degree..
15. The can lid according to claim 13 wherein a line passing
through the ends of said arcuate chuckwall is at an angle with
respect to said central axis of the center panel of from about
40.degree. to about 50.degree..
16. The can lid according to claim 13 wherein said arcuate
chuckwall has a radius of curvature of from about 0.4 to about 1
inch, the center-point of said radius located below the profile of
said lid.
17. The can lid according to claim 1 wherein said annular
countersink has a height of from about 0.030 to about 0.115
inches.
18. The can lid of claim 17 wherein said chuckwall is an arcuate
chuckwall having a radius of curvature of from about 0.4 to about 1
inch, the center-point of said radius being located below the
profile of said lid.
19. The can lid of claim 17 further comprising a step portion
extending radially outward from said chuckwall.
20. The can lid according to claim 19 wherein said chuckwall is an
arcuate chuckwall.
21. A lid for a can body comprising: a center panel having a
central axis that is perpendicular to a diameter of the outer rim
of said lid; an annular countersink surrounding said center panel;
a chuckwall extending radially outward from said annular
countersink, wherein a line passing through the ends of said
chuckwall is at an angle with respect to said central axis of the
center panel of from about 20.degree. to about 80.degree.; a step
portion extending radially outward from said chuckwall; a
transitional portion extending radially outward from said step
portion; and a peripheral curl portion having a height less than
0.091 inches extending radially outward from said transitional
portion.
22. The can lid according to claim 21 wherein said chuckwall is an
arcuate chuckwall.
23. The can lid according to claim 21 wherein said step portion is
an arcuate step portion.
24. The can lid according to claim 21 wherein said chuckwall is an
arcuate chuckwall and said step portion is an arcuate step
portion.
25. A lid for a can body comprising: a center panel having a
central axis that is perpendicular to a diameter of the outer rim
of said lid; an annular countersink surrounding said center panel
wherein said annular countersink has a height of from about 0.030
to about 0.115 inches; an arcuate chuckwall extending radially
outward from said annular countersink wherein said arcuate
chuckwall has a radius of curvature of from about 0.4 to about 1
inch, the center-point of said radius being located below the
profile of said lid, and wherein a line passing through the ends of
said arcuate chuckwall is at an angle with respect to said central
axis of the center panel of from about 20.degree. to about
80.degree.; an arcuate step portion extending radially outward from
said arcuate chuckwall wherein said arcuate step portion has a
radius of curvature of from about 0.02 to about 0.06 inches, the
center-point of said radius being located above the profile of said
lid; a transitional portion extending radially outward from said
arcuate step portion; and a peripheral curl portion extending
radially outward from said transitional portion wherein said
peripheral curl portion has a height less than 0.091 inches.
26. A method of forming a double seam joining a can body to a can
lid, the can lid having a slanted chuckwall at an angle of from
about 20.degree. to about 80.degree., a step portion joining the
chuckwall to a transitional portion, and a peripheral curl, and the
can body having a can body flange, comprising the steps of:
supporting the can body on a base plate; positioning the can lid on
the can body with the transitional portion resting on the can body
flange; providing a chuck having a lower portion and a
substantially cylindrical upper portion, the lower portion
configured to closely conform to the chuckwall surface and the
surface of the step portion when the chuck is in engagement with
the can lid; engaging the can lid with the chuck; rolling the
peripheral curl and can body flange together to form an
intermediate interlocking peripheral seam; and compressing the
intermediate interlocking peripheral seam against the upper portion
of the chuck to form a double seam.
Description
TECHNICAL FIELD
[0001] The present invention relates generally to metal containers,
and more particularly to metal cans.
BACKGROUND OF THE INVENTION
[0002] Aluminum cans are used primarily as containers for retail
sale of beverages in individual portions. Annual sales of such cans
are in the billions and consequently, over the years, their design
has been refined to reduce cost and improve performance. Other
refinements have been made for ecological purposes, to improve
reclamation and promote recycling.
[0003] Cost reductions may be realized in material savings, scrap
reduction and improved production rates. Performance improvements
may be functional in nature, such as better sealing and higher
ultimate pressure capacity. Such improvements can allow the use of
thinner sheet metal, which leads directly to material cost
reductions. Performance improvements may also be ergonomic in
nature, such as a can end configured to allow for easier pull tab
access or better lip contact.
[0004] Aluminum cans are usually formed from a precoated aluminum
alloy, such as the aluminum alloy 5182. The cans, which are
typically made from relatively thin sheet metal, must be capable of
withstanding pressures approaching 100 psi., with 90 psi being an
industry recognized requirement. The cans are usually formed from a
can body to which is joined a can lid or closure. Each of these
components has certain specifications and requirements. For
instance, the upper surface of the can lids must be configured to
nest with the lower surface of the can bottoms so that the cans can
be easily stacked one on top of the other. It is also desirable to
have the can lids themselves nest with each other in a stacked
arrangement for handling and shipping purposes prior to attaching
the can lid to the can body. The ability to satisfy these
functional requirements with the use of ever less material
continues to develop.
[0005] A prior art disclosure, published under the Patent
Cooperation Treaty in International Publication Number WO 96/37414,
discloses can lid design for reduced metal usage and improved
pressure capability. This can lid comprises a peripheral portion or
"curl," a frustroconical chuckwall depending from the interior of
the peripheral curl, an outwardly concave annular reinforcing bead
or "countersink" extending radially inwards from the chuckwall, and
a center panel supported by the inner portion of the countersink.
The frustroconical chuckwall is inclined at an angle of between
20.degree. and 60.degree. with respect to an axis perpendicular to
the center panel. A double seam is formed between this can end and
a can body by a process wherein the peripheral curl is centered on
the can body flange by a frustroconical/cylindrical chuck designed
to fit into the frustroconical chuckwall of the can lid. The
overlap of the peripheral curl on the lid with the can body flange
is described to be by a conventional amount. Rotation of the can
lid/can body, first against a seaming roll and then a flattening
roll completes a double seam between the two parts. During the
flattening operation, the portion of the chuckwall adjacent to the
peripheral curl is bent to a cylindrical shape and flattened
against the cylindrical surface of the chuck. The lid of
International Publication Number WO 96/37414 incorporates known
dimensions for the peripheral curl portion which is seamed to the
can.
[0006] The can lid disclosed in International Publication Number WO
96/37414 requires a greater amount of metal than the can lid of the
present invention, thereby increasing the manufacturing costs. The
increased metal usage in this prior art stems from a higher, or
deeper, countersink, a larger peripheral curl portion than is
disclosed in the present invention and the use of a frustroconical
chuckwall that is characterized by a single angle with respect to
an axis perpendicular to the central panel. The can lid disclosed
in WO 96/37414 is also susceptible to increased metal deformation
during seaming and failure at lower pressures.
SUMMARY OF THE INVENTION
[0007] The present invention contemplates improved aluminum can
lids combining a slanted chuckwall with a reduced seam. A preferred
embodiment of the disclosed can lid has a center panel having a
central axis that is perpendicular to a diameter of the outer rim
of the can lid, an annular countersink extending radially outward
from the center panel, an arcuate chuckwall extending radially
outward from the annular countersink, a step portion, a
transitional portion extending radially outward from the chuckwall,
and a peripheral curl extending outwardly from the transitional
portion. The step portion improves the consistency and integrity of
a double seam formed between the can lid and the can body while the
arcuate chuckwall improves the strength of the can lid as compared
to a simple frustroconical chuckwall. These features reduce metal
usage in manufacturing and are expected to reduce filled can
failures, and allow the use of thinner sheet metal for the can
lid.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The accompanying drawings are incorporated into and form a
part of the specification to assist in explaining the present
inventions. The drawings are intended for illustrative purposes
only and are not intended as exact representations of the
embodiments of the present inventions. The drawings further
illustrate preferred examples of how the inventions can be made and
used and are not to be construed as limiting the inventions to only
those examples illustrated and described. The various advantages
and features of the present inventions will be apparent from a
consideration of the drawings in which:
[0009] FIG. 1 shows an elevational cross-sectional view of a can
lid constructed in accordance with the invention;
[0010] FIG. 2 shows an elevational cross-sectional view of a can
lid constructed in accordance with the invention;
[0011] FIG. 3 shows an elevational cross-sectional view of a can
lid constructed in accordance with the invention;
[0012] FIG. 4 shows an elevational cross-sectional view of a can
lid on a can body before forming of a double seam;
[0013] FIG. 5 shows an elevational cross-sectional view of a can
lid on a can body as it appears during the first step of forming a
double seam;
[0014] FIG. 6 shows an elevational cross-sectional view of a can
lid on a can body as it appears during the final step of forming a
double seam;
[0015] FIG. 7 shows an elevational cross-sectional view of the
manner of stacking can lids constructed in accordance with the
invention; and
[0016] FIG. 8 shows an elevational cross-sectional view of the
manner of stacking filled cans of the present inventions.
DETAILED DESCRIPTION OF THE DRAWINGS
[0017] The present inventions are described in the following text
by reference to drawings of examples of how the inventions can be
made and used. The drawings are for illustrative purposes only and
are not exact scale representations of the embodiments of the
present inventions. In these drawings, the same reference
characters are used throughout the views to indicate like or
corresponding parts. FIG. 1 illustrates one preferred embodiment of
can lid 10. The embodiments shown and described herein are
exemplary. Many details are well known in the art, and as such are
neither shown nor described. It is not claimed that all of the
details, parts, elements, or steps described and shown were
invented herein. Even though numerous characteristics and
advantages of the present inventions have been described in the
drawings and accompanying text, the description is illustrative
only, and changes may be made, especially in matters of
arrangement, shape and size of the parts, within the principles of
the invention to the full extent indicated by the broad general
meaning of the terms used in the claims. The dimensions provided in
the description are tooling dimensions and the actual dimensions of
can lids manufactured in accordance with the present invention may
vary.
[0018] FIG. 1 is a cross-section view of a can lid 10, illustrative
of a preferred embodiment of the present inventions. Can lid 10 is
preferably made from aluminum sheet metal. Typically, an aluminum
alloy is used, such as aluminum alloy 5182. The sheet metal
typically has a thickness of from about 0.080 to about 0.100
inches, more preferably from about 0.082 to about 0.094 inches, and
still more preferably from about 0.084 to about 0.088 inches. The
sheet metal may be coated with a coating (not shown) on at least
one side. This coating is usually provided on that side of the
sheet metal that will form the interior of the can. Can lids are
usually formed in a multi-step operation. Those skilled in the art
will be well acquainted with such methods of forming can lids to
provide the configuration and geometry of the can lid 10 as
described herein.
[0019] The can lid 10 has a center panel 12. The center panel 12 is
generally circular in shape but may be intentionally noncircular.
The center panel 12 may have a diameter d.sub.1 of from about 1.5
to about 2 inches, more preferably from about 1.6 to about 1.9
inches, and still more preferably from about 1.7 to about 1.8
inches. Although the center panel 12 is shown as being flat, it may
also have a peaked or domed configuration as well, and is not
necessarily limited to the flat or planar configuration. The center
panel 12 has a central axis 14 that is perpendicular to a diameter
d.sub.2 of the outer rim, or peripheral curl portion 38, of can lid
10. The diameter d.sub.1 of center panel 12 is preferably less than
80% of the diameter d.sub.2 of the outer rim, or peripheral curl
portion 38, of can lid 10.
[0020] Surrounding the center panel is an annular countersink 16
that is formed from an interior wall 20 and an exterior wall 28,
which are spaced apart and joined together by a curved bottom
portion 24. The inner and outer walls 20, 28 are generally flat and
may be parallel to one another or at a slight angle, with the
bottom portion 24 being curved. The inner and outer walls 20, 28
are preferably parallel to central axis 14 but either or both may
diverge by an angle of about as much as 15.degree.. The annular
counter sink 16 is joined to the center panel 12 along the upper
edge of the interior wall 20. The curved juncture 18 joining
interior wall 20 and edge of the center panel 12 has a radius of
curvature r.sub.1, that is from about 0.013 to about 0.017 inches,
more preferably from about 0.014 to about 0.016 inches, and still
more preferably from about 0.1425 to about 0.01525 inches, though
this radius of curvature r.sub.1 is not considered critical. The
center-point of radius of curvature r.sub.1 is located below the
profile of can lid 10. Interior wall 20 is joined to bottom portion
24 by curved juncture 22 having a radius of curvature r.sub.2.
Radius of curvature r.sub.2 is from about 0.006 to about 0.018
inches, more preferably from about 0.009 to about 0.015 inches, and
still more preferably from about 0.011 to about 0.013 inches,
though radius of curvature r.sub.2 is not considered critical. The
center-point of radius of curvature r.sub.2 is located above the
profile of can lid 10. Bottom portion 24 is joined to outer wall 28
by curved juncture 26, having a radius of curvature r.sub.3 that is
from about 0.010 to about 0.022 inches, more preferably from about
0.012 to about 0.020 inches, and still more preferably from about
0.014 to about 0.018 inches. Radius of curvature r.sub.3 has a
center-point located above the profile of can lid 10 and is also
not considered critical. The annular countersink 16 has a height
h.sub.1 of from about 0.03 to about 0.115 inches, more preferably
from about 0.05 to about 0.095 inches, and still more preferably
from about 0.06 to about 0.085 inches.
[0021] The annular countersink 16 is joined to chuckwall 132 by
curved juncture 30 having a radius of curvature r.sub.4 of from
about 0.03 to about 0.07 inches, more preferably from about 0.035
to about 0.06 inches, and still more preferably from about 0.0375
to about 0.05 inches, though not considered critical. The
center-point of radius of curvature r.sub.4 is located below the
profile of can lid 10. Chuckwall 132 is shown as an arcuate
chuckwall having a radius of curvature r.sub.5 that is from about
0.4 to about 1 inch, more preferably from about 0.520 to about
0.845 inches, still more preferably from about 0.620 to about 0.745
inches, and most preferably from about 0.670 to about 0.695 inches.
The center-point of radius of curvature r.sub.5 is located below
the profile of can lid 10. The arcuate chuckwall 132 is such that a
line passing through the innermost end of arcuate chuckwall 132,
near the terminus of curved juncture 30, and the outermost end of
the arcuate chuckwall 132, near the beginning of step portion 34,
forms an acute angle with respect to central axis 14 of the center
panel 12. This acute angle is from about 20.degree. to about
80.degree., and more preferably from about 30.degree. to about
60.degree., and still more preferably from about 40.degree. to
about 50.degree..
[0022] The step portion 34 extends radially outward from the
arcuate chuckwall 132. Step portion 34 is preferably curved with a
radius of curvature r.sub.6 of from about 0.02 to about 0.06
inches, more preferably from about 0.025to about 0.055 inches,
still more preferably from about 0.03 to about 0.05 inches, and
most preferably from about 0.035 to about 0.045 inches. The radius
of curvature r.sub.6 has a center-point located above the profile
of the can lid 10.
[0023] Transitional portion 36 extends radially outward from-step
portion 34. Transitional portion 36 has a radius of curvature
r.sub.7 of from about 0.04 to about 0.09 inches, more preferably
from about 0.05 to about 0.08 inches, and still more preferably
from about 0.06 to about 0.07 inches. Radius of curvature r.sub.7
has a center-point located below the profile of can lid 10.
Peripheral curl portion 38 extends radially outward from
transitional portion 36. Peripheral curl portion 38 has a height
h.sub.2 of from about 0.04 to about 0.09 inches, more preferably
from about 0.0475 to about 0.0825 inches, still more preferably
from about 0.055 to about 0.075 inches, and most preferably from
about 0.06 to about 0.07 inches.
[0024] FIG. 2 shows the same embodiment of can lid 10 as FIG. 1
with the exception of chuckwall 132. Chuckwall 232 in FIG. 2 is not
an arcuate chuckwall but is generally flat or planar from a
cross-sectional view. Chuckwall 232 has no radius of curvature.
Chuckwall 232 is inclined at an angle with respect to central axis
14 of from about 20.degree. to about 80.degree., and more
preferably of from about 30.degree. to about 60.degree., and still
more preferably from about 40.degree. to about 50.degree..
[0025] FIG. 3 shows the same embodiment of can lid 10 as FIG. 1
with the exception of chuckwall 132 and step portion 34. Chuckwall
332 in FIG. 3 is not an arcuate chuckwall but is generally flat or
planar from a cross-sectional view. Chuckwall 332 has no radius of
curvature. Chuckwall 332 is inclined at an angle with respect to
central axis 14 of from about 20.degree. to about 80.degree., and
more preferably of from about 30.degree. to about 60.degree., and
still more preferably from about 40.degree. to about 50.degree..
Transitional portion 36 extends radially outward from chuckwall 332
in FIG. 3, as opposed to extending radially outward from step
portion 34 in FIG. 1. Chuckwall 332 is connected to peripheral curl
portion 38 by transitional portion 36.
[0026] FIG. 4 shows can lid 10 resting on can body 40, and
particularly resting on flange 42 of can body 40. Can body 40 is
supported by a base plate 45 (not shown) which together with chuck
44 is mounted for rotation about axis 14. Chuck 44 includes a
driving surface 46 configured to match and engage with the surface
of chuckwall 132 and with radius of curvature r.sub.6. Chuck 44
includes a substantially cylindrical upper portion 48. As discussed
below, upper portion 48 may be modified by a draft angle for
production purposes. A limited clamping force between chuck 44 and
base plate 45 (not shown) provides adequate friction between chuck
44 and chuckwall 132 for positive rotation of can lid 10 and can
body 40.
[0027] FIG. 5 shows the initial stage of double seam formation
between can lid 10 and can body 40. Roller 50 bears against
peripheral curl portion 38 and the centering force exerted by chuck
44. Chuck 44 drives can lid 10 and can body 40 to rotate,
generating a rolling, swaging action that reforms transitional
portion 36, peripheral curl portion 38, and flange 42 into an
intermediate peripheral seam 52. Radius of curvature r.sub.6 bears
against chuck 44 to support transitional portion 36 and peripheral
curl portion 38 leads the rolling deformation against roller 50.
Thus positive support and guidance work together to achieve
consistent and reliable results in producing intermediate
peripheral seam 52.
[0028] FIG. 6 shows the final stage of forming a double seam
between can lid 10 and can body 40. Here, roller 60 bears against
intermediate peripheral seam 52 as it is supported by chuck 44.
Chuck 44 drives can lid 10 and can body 40 to rotate, so that the
pressure of roller 60 flattens intermediate peripheral seam 52
against upper portion 48 of chuck 44, producing double seam 54.
Upper portion 48 of chuck 44 may be modified to include a draft
angle for ease of separation of can lid l O after this
operation.
[0029] FIG. 7 shows the manner in which a plurality of can lids 10
stack for handling, packaging, and feeding a seaming machine.
Annular countersink 16a of can lid 10a bears down against chuckwall
132b near curved juncture 30b of adjacent can lid 10b. Can lid 10a
is supported and separated from can lid 10b by a height h.sub.3
sufficient to accommodate the thickness of a pull-tab (not shown).
In this manner, can lids 10 are compactly and efficiently handled
and are more readily positioned for magazine feeding of a
mechanized seaming operation.
[0030] FIG. 8 shows the manner of stacking filled can 64a, closed
and sealed according to the present invention on a like filled can
64b. Stand bead 66a rests upon double seam 54b.
[0031] The following table indicates model test results on buckle
pressures for a prior art can lid and an embodiment of the present
invention. The buckle pressure is the pressure at which a sealed
can experiences seam failure. The industry standard for minimum
acceptable buckle pressure is around 90 psi. This table is based
solely on model results and is included for illustrative purposes
only. These model results indicate that implementation of an
embodiment of the present invention will result in obtaining a
buckle pressure no worse than a prior art can lid.
1 CAN LID BUCKLE PRESSURE (PSI) Prior Art Can Lid Basis With Mini
Seam and Nonarcuate Chuckwall Can Lid of FIG. 1 4 psi above basis
With Reduced Seam Peripheral Curl, Arcuate Chuckwall, and Step
Portion
[0032] The embodiments shown and described above are exemplary.
Many details are often found in the art and, therefore, many such
details are neither shown nor described. It is not claimed that all
of the details, parts, elements, or steps described and shown were
invented herein. Even though numerous characteristics and
advantages of the present inventions have been described in the
drawings and accompanying text, the description is illustrative
only, and changes may be made in the detail, especially in matters
of shape, size, and arrangement of the parts within the principles
of the inventions to the full extent indicated by the broad meaning
of the terms of the attached claims.
[0033] The restrictive description and drawings of the specific
examples above do not point out what an infringement of this patent
would be, but are to provide at least one explanation of how to use
and make the inventions. The limits of the inventions and the
bounds of the patent protection are measured by and defined in the
following claims.
* * * * *