U.S. patent application number 09/820753 was filed with the patent office on 2001-11-08 for structure of reinforcing ribs around the bottle waist.
This patent application is currently assigned to YOSHINO KOGYOSHO CO., LTD.. Invention is credited to Tanabe, Shoji, Yoneyama, Shigeru.
Application Number | 20010037992 09/820753 |
Document ID | / |
Family ID | 18609263 |
Filed Date | 2001-11-08 |
United States Patent
Application |
20010037992 |
Kind Code |
A1 |
Tanabe, Shoji ; et
al. |
November 8, 2001 |
Structure of reinforcing ribs around the bottle waist
Abstract
The title of the invention is the structure of reinforcing ribs
around bottle waist. The purpose of the invention is to achieve
enhanced buckling strength in a bottle of a reinforcing rib
structure comprising a horizontal concave rib in the waist portion
of the bottle body and the reinforcing ribs disposed vertically at
regular intervals along the circumference of this horizontal
concave rib. The means to achieve this purpose is to give the
bottle a configuration comprising: A bottle composed of neck (1),
shoulder (2), body (3), and bottom (4), said body (3) consisting of
an upper body (7), a lower body (8), and the waist (9) between the
upper and lower bodies; A horizontal concave rib (16) forming
itself into said waist (9) and consisting of a concave wall
connected to the lower end of said upper body (7), a concave wall
connected to said lower body (8), and the bottom (16c) of the
concave between these upper and lower concave walls; and
Reinforcing ribs (18), which are disposed in the vertical direction
at regular intervals along the circumference of said horizontal
concave rib (16); Wherein said vertical reinforcing ribs (18) are
designed to be narrow in the central part and wide at either or
both ends, where each of said ribs is integrated with the
peripheries of concave walls of said horizontal concave rib
(16).
Inventors: |
Tanabe, Shoji; (Kohto-ku,
JP) ; Yoneyama, Shigeru; (Kohto-ku, JP) |
Correspondence
Address: |
Oliff & Berridge PLC
P.O. Box 19928
Alexandria
VA
22320
US
|
Assignee: |
YOSHINO KOGYOSHO CO., LTD.
|
Family ID: |
18609263 |
Appl. No.: |
09/820753 |
Filed: |
March 30, 2001 |
Current U.S.
Class: |
215/384 ;
215/382; 215/383 |
Current CPC
Class: |
B65D 79/0084 20200501;
B65D 1/0223 20130101; B65D 2501/0027 20130101; B65D 2501/0036
20130101 |
Class at
Publication: |
215/384 ;
215/382; 215/383 |
International
Class: |
B65D 090/02 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 30, 2000 |
JP |
JP 12-094177 |
Claims
1. A structure of reinforcing ribs disposed circumferentially
around bottle body, which is characterized by a configuration
comprising: A bottle composed of neck, shoulder, body, and bottom,
said body consisting of an upper body, a lower body, and the waist
between the upper and lower bodies; A horizontal concave rib
forming itself into said waist and consisting of a concave wall
connected to the lower end of said upper body, a concave wall
connected to said lower body, and the bottom of the concave between
these upper and lower concave walls; and Reinforcing ribs, which
are disposed in the vertical direction at regular intervals along
the circumference of said horizontal concave rib; Wherein said
vertical reinforcing ribs are designed to be narrow in the central
part and wide at either or both ends, where each of said ribs is
integrated with the peripheries of concave walls of said horizontal
concave rib.
2. The structure of reinforcing ribs disposed circumferentially
around bottle body, according to claim 1, wherein said vertical
reinforcing ribs are designed to be narrow in the central part and
wide at both of the upper and lower ends where each reinforcing rib
is integrated with the peripheries of said concave walls.
3. The structure of reinforcing ribs disposed circumferentially
around bottle body, according to claim 1, wherein said vertical
reinforcing ribs are designed to be narrow in the central part and
wide at either of the upper or lower end where each reinforcing rib
is integrated with the peripheries of said concave walls.
Description
TECHNICAL FIELD
[0001] This invention relates to the structure of reinforcing ribs
disposed around bottle waist, and particularly to the reinforcing
ribs combined with a horizontal concave rib and disposed vertically
inside the horizontal concave rib that forms the waist of a
bottle.
BACKGROUND OF THE INVENTION
[0002] It has been conventionally well known for bottles to have a
horizontal concave rib that forms the waist of the bottle so as to
reinforce the bottle body and to get an easy grip of the
bottle.
[0003] However, conventional bottles had a problem in that the
horizontal concave rib did not contribute to the reinforcement of
buckling strength, even though the rib could have improved the
toughness of the bottle body.
[0004] For the solution of this problem, it is proposed that
vertical reinforcing ribs are disposed circumferentially along the
horizontal concave rib at regular intervals, as shown in FIG. 5, so
as to enhance the buckling strength in the waist portion of a
bottle.
[0005] In FIG. 5, the sign (Aa) denotes a conventional bottle
comprising the neck la, the shoulder 2a, the body 3a, and the
bottom 4a. Also, the sign (a) is a horizontal concave rib provided
in the waist portion of the body, and the sign (b) denotes vertical
reinforcing ribs.
[0006] A certain level of buckling strength can be maintained in
the above-described bottle (Aa) because reinforcing ribs (b) are
provided along the horizontal concave rib (a). Since, however, both
sides of each reinforcing rib extend straight vertically, the upper
end (b1) and the lower end (b2) of the reinforcing rib (b) form
narrow connections with the horizontal concave rib (a), and these
connections are found weak in stress transmission. Stress would be
concentrated on these connections, thus causing the problem that
makes it impossible to enhance the buckling strength further.
Especially when the amount of a resinous material used has to be
reduced to save the material, the bottle body would have a less
thickness and a lower buckling strength than before. Therefore, the
concentrated stress created another problem, i.e., a limitation in
weight reduction.
SUMMARY OF THE INVENTION
[0007] The object of this invention is to provide reinforcing ribs
of such a structure that further enhanced buckling strength can be
obtained for the horizontal concave rib around the bottle waist
when these ribs are disposed in the waist portion of the bottle
body.
[0008] This invention is characterized by a bottle configuration
comprising:
[0009] A bottle composed of neck, shoulder, body, and bottom, said
body consisting of an upper body, a lower body, and the waist
between the upper and lower bodies;
[0010] A horizontal concave rib forming itself into the waist and
consisting of a concave wall connected to the lower end of said
upper body is, a concave wall connected to said lower body, and the
bottom of the concave between these upper and lower concave walls;
and
[0011] Reinforcing ribs, which are disposed in the vertical
direction at regular intervals along the circumference of said
horizontal concave rib;
[0012] Wherein said vertical ribs are designed to be narrow in the
central part and wide at either or both ends, where each vertical
rib is integrated with the peripheries of the concave walls of said
horizontal concave rib.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a front view of the bottle in the first embodiment
of this invention.
[0014] FIG. 2 is a cross-sectional view taken from line A-A of FIG.
1.
[0015] FIG. 3 shows a vertical cross-sectional view of the
reinforcing rib.
[0016] FIG. 4 is a front view of the bottle in the second
embodiment of this invention.
[0017] FIG. 5 is an explanatory diagram of a bottle in prior
art.
[0018] FIG. 6 shows explanatory diagrams of the bottle-analyzing
shapes.
[0019] FIG. 7 is a graph showing the results of an analysis.
DETAILED DESCRIPTION OF THE INVENTION
[0020] This invention is further described by making reference to
the drawings.
[0021] In FIG. 1, (A) is a PET bottle molded by the bi-axially
oriented blow molding, and consists of neck 1, shoulder 2, body 3,
and bottom 4.
[0022] The neck 1 is provided on its outer circumference with a
widened ring 5 and a neck ring 6. Under the neck ring 6, the
bottleneck has an enlarged diameter and connects with the shoulder
2.
[0023] The body 3 consists of upper body 7, lower body 8, and the
waist 9 between the upper and lower bodies 7 and 8.
[0024] The upper body 7 is provided with several horizontal ribs 10
having a round cross-section. A terrace portion 11 is formed
between the upper body 7 and the waist 9 and has a wider diameter
than the remaining portion of the upper body 7.
[0025] The lower body 8 has a wider diameter than the upper body 7,
and is provided with several arc walls 12, which serve as the
support for the bottle body, and with vacuum-absorbing walls 15
consisting of inclined walls 13 and flat recessed walls 14, with
each vacuum-absorbing wall being arranged between two adjacent arc
walls.
[0026] As shown in FIGS. 2 and 3, the waist 9 comprises a
horizontal concave rib 16. Along its upper peripheral
circumference, the rib 16 connects with the terrace portion 11 of
the upper body 7, and along the lower peripheral circumference, the
rib 16 connects with the lower body 8.
[0027] In the cross-sectional shape, this horizontal concave rib 16
consists of upper and lower concave walls 16a and 16b and a gently
curved bottom 16c. The bottom 16c is provided with two narrow
ridges extending along the circumference of the horizontal concave
rib 16.
[0028] The horizontal concave rib 16 is also provided with multiple
reinforcing ribs 18 extending in the vertical direction and
disposed circumferentially at regular intervals.
[0029] At its upper end 18a and lower end 18b, each of the
reinforcing ribs is integrated with the peripheral portions of the
concave walls, 16a and 16b, respectively, of the horizontal concave
rib 16. In the central part 18c, the reinforcing rib has an outward
rise for a certain length from the concave walls of the horizontal
concave rib 16, so that the ridge of the vertical rib 18 forms a
shallow arch in its side view.
[0030] The reinforcing ribs are wide at their upper and lower ends
18a and 18b; and they are narrow in the central part 18c. On both
sides where the reinforcing rib 18 comes in contact with the
horizontal concave rib 16, the rib 18 forms the concave lines, and
in its front view the rib looks like the upper and lower arms of
cross forme.
[0031] In this embodiment, width of the rib 18 at both ends, 18a
and 18b, is about 2.4 times as much as the width in the central
part.
[0032] A horizontal rib 19 is disposed at the lower end of the
lower body 8 and connects to the bottom 4.
[0033] The bottom 4 comprises a bottom ring portion 20 and a
central conical wall 21 rising up from the ring portion 20. The
conical wall 21 is provided with multiple, publicly known, radially
arranged reinforcing ribs 22.
[0034] The action and effect are now described for the horizontal
concave rib 16 and the reinforcing ribs 18, both of which are
disposed around the waist 9. The horizontal concave rib 16 serves
to increase the toughness of the body 3, and to get easy hold of
the bottle.
[0035] In addition, the reinforcing ribs 18 are provided in the
waist 9. The upper and lower ends of each of the reinforcing ribs
18 are integrated with the respective upper and lower peripheries
of the concave walls of the horizontal concave rib 16. The
reinforcing ribs 18 are designed to have wider ends than in the
central part so that stress is dispersed and the buckling strength
is enhanced at both of the upper and lower ends, 18a and 18b.
[0036] A varied embodiment of reinforcing ribs is now described,
wherein the ribs of a different shape are disposed along the
horizontal concave rib in the waist 9.
[0037] In the previous embodiment, the reinforcing ribs have wider
upper and lower ends than in the central part. In this embodiment,
the reinforcing ribs have only the wide lower end.
[0038] Except for this change, the bottle in this embodiment is
identical with the bottle in the first embodiment. Thus, only the
configuration associated with the reinforcing ribs is described
below.
[0039] As shown in FIG. 4, the waist of bottle B has the same
horizontal concave rib 30 as in the previous embodiment. The
reinforcing ribs 31 are disposed within the horizontal concave rib
30 at regular intervals.
[0040] At its upper end 31a and lower end 31b, each of the
reinforcing ribs is integrated with the peripheral portions of the
concave walls 30a and 30b, respectively, of the horizontal concave
rib 30. In the central part 31c, the reinforcing rib has an outward
rise for a certain length from the bottom surface 30c of the
horizontal concave rib 30, so that the ridge of the vertical rib 31
forms a shallow arch in its side view.
[0041] The reinforcing ribs 31 are wide at their lower end 31b,
where the rib 31 is integrated with the lower periphery of the
horizontal concave rib 30, and are narrow in the area ranging from
the central part 31c to the upper end 31a, giving the reinforcing
ribs a shape of the lower arm of cross forme in its front view.
[0042] The action and effect are now described for the horizontal
concave rib 30 and the reinforcing ribs 31. Since the reinforcing
rib 31 is integrated with the lower periphery of the horizontal
concave rib 30 along the wide lower end 31b, this wide connection
between the lower end 31b and the lower periphery of the horizontal
concave rib 30 allows stress to be dispersed so that the buckling
strength of the body 3 can be enhanced.
[0043] The buckling strength of the reinforcing rib structure
according to this invention is now explained on the basis of a
strength calculation analysis.
[0044] The buckling strength was calculated for the bottle A in the
first embodiment of this invention and for the bottle B in the
second embodiment, and the results were compared with the buckling
strength of a conventional bottle Aa.
[0045] For the convenience of analysis for bottle waist, the
reinforcing ribs were assumed to have such shapes as shown in FIG.
6.
[0046] In FIG. 6, Aa1 shows the bottle shape analyzed for the waist
portion of a conventional bottle Aa; B1, the shape analyzed for
bottle B in the second embodiment of this invention; and A1, the
shape analyzed for bottle A in the first embodiment of this
invention. The resinous material used was PET (having a Young's
modulus of E=350 kg/mm.sup.2 and a Poisson ratio of
.quadrature.=0.35). The conventional bottle Aa and the bottles A
and B in the two embodiments of this invention were given the same
dimensions for the diameters of upper and lower bodies and for the
diameter and height of the waist. Thus, the strength calculation
was conducted for the bottle waist, assuming uniform sizes for all
types of bottles, including an upper body diameter of 88 mm, a
lower body diameter of 105 mm, a concave bottom diameter of 78 mm
for the horizontal concave rib, a reinforcing rib height of 26.8
mm, and a thickness of 0.333 mm.
[0047] The strength test involved fixing the lower portion of each
test bottle and applying a compressive force from above. The
buckling strength was calculated by obtaining the quantity of
deformation in the top portion of the test bottles.
[0048] As a result, an analytical graph, such as shown in FIG. 7,
was obtained. X, Y, and Z are the points of intersection in the
equilibrium curves obtained before and after the buckling which has
taken place in the waist of bottles Aa, B, and A, respectively.
Thus, buckling occurs at such a point of intersection or a turning
point for each bottle.
[0049] A test bottle Aa1 was manufactured and tested. It had a
buckling strength of 35 kg. This value was used as the buckling
strength at Point X, and the analytical values were converted to
give a graph shown in FIG. 7, wherein the graph was depicted from
the levels of buckling strength versus the level of deformation.
The level of buckling strength for bottles A and B, obtained from
the graph, are as given in the following table.
1 TABLE 1 Buckling strength A comparison with prior art bottle
Bottle Aa 35.0 kg Bottle B 46.7 kg Up 33.4% Bottle A 95.4 kg Up
172.6%
[0050] From the foregoing results of analysis, it is obvious that
the reinforcing ribs are highly active and effective because the
bottle B in the second embodiment has a buckling strength of more
than 40 kg, up 33% from the conventional bottle Aa; and because the
bottle A in the first embodiment had a buckling strength of more
than 90 kg, up 172.6%.
[0051] The reinforcing ribs are disposed in the vertical direction
along the circumference of the horizontal concave rib at regular
intervals. These reinforcing ribs are designed to be narrow in the
central part and wide at either or both of the upper and lower
ends, where each vertical rib is integrated with the peripheries of
the horizontal concave rib. As a result, it has become possible in
this invention to lessen the stress and enhance the buckling
strength at either or both ends of each vertical rib.
* * * * *