U.S. patent application number 09/380769 was filed with the patent office on 2002-04-04 for core for caddie bag and caddie bag using same core.
Invention is credited to IWATA, MOTOTAKA, MIURA, KORYO, YOSHIDA, SATOSHI.
Application Number | 20020038771 09/380769 |
Document ID | / |
Family ID | 12475683 |
Filed Date | 2002-04-04 |
United States Patent
Application |
20020038771 |
Kind Code |
A1 |
MIURA, KORYO ; et
al. |
April 4, 2002 |
CORE FOR CADDIE BAG AND CADDIE BAG USING SAME CORE
Abstract
A core (3) for a caddie bag includes three arc portions (31 to
33) each with a PCCP structure. These arc portions are connected by
a hinge portion (34) without the PCCP structure, and the hinge
portion is bent to form a cylindrical core. The cylindrical core
has one end with a collar (5) attached thereto, and the other end
with a bottom member (6) attached thereto. The collar and the
bottom member are connected by a frame member (12), whereby a
caddie bag (1) is constructed.
Inventors: |
MIURA, KORYO; (TOKYO,
JP) ; YOSHIDA, SATOSHI; (OSAKA, JP) ; IWATA,
MOTOTAKA; (OSAKA, JP) |
Correspondence
Address: |
MCDERMOTT WILL & EMERY
600 13TH STREET, N.W.
WASHINGTON
DC
20005-3096
US
|
Family ID: |
12475683 |
Appl. No.: |
09/380769 |
Filed: |
September 13, 1999 |
PCT Filed: |
January 27, 1999 |
PCT NO: |
PCT/JP99/00329 |
Current U.S.
Class: |
206/315.8 ;
220/669 |
Current CPC
Class: |
Y10T 29/49796 20150115;
A63B 55/00 20130101 |
Class at
Publication: |
206/315.8 ;
220/669 |
International
Class: |
A63B 055/00; B65D
006/08; B65D 006/10 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 2, 1998 |
JP |
10-36648 |
Claims
1. A core of a caddie bag (1), wherein said core (3) includes a
PCCP (Pseudo-Cylindrical Concave Polyhedral) structure (2).
2. The core of a caddie bag according to claim 1, wherein said core
(3) is fabricated entirely or partially of the PCCP structure
(2).
3. The core of a caddie bag according to claim 2, further
comprising a smooth second core (8, 9) without the PCCP structure
superposed on either one or both of an outer surface and an inner
surface of said core.
4. A core of a caddie bag, comprising: a plurality of arc portions
(31-33) each having a PCCP structure; and a hinge portion (34)
without the PCCP structure for connecting said plurality of arc
portions; said hinge portion being bent to form a cylindrical
core.
5. The core of a caddie bag according to claim 4, further
comprising a smooth, second core (8, 9) without the PCCP structure
that is superposed on either one or both of outer and inner
surfaces of said cylindrical core (3).
6. A caddie bag (1), comprising: a core (3) having a PCCP structure
and formed into a cylinder; a collar (5) attached to an opening on
one end of said core; a bottom member (6) provided on another end
of said core; and a frame member (12) connecting said collar and
said bottom member.
7. The caddie bag according to claim 6, wherein said core (3) is
fabricated entirely or partially of the PCCP structure.
8. The caddie bag according to claim 7, wherein said core (3)
includes a plurality of arc portions (31-33) each having the PCCP
structure and a hinge portion (34) without the PCCP structure for
connecting said plurality of arc portions, said hinge portion being
bent to form a cylindrical core.
9. The caddie bag according to claim 8, further comprising a second
core (8, 9) without the PCCP structure that is superposed on either
one or both of an outer surface and an inner surface of said
cylindrical core.
10. The caddie bag according to claim 6, wherein said frame member
is detachable.
11. The caddie bag according to claim 10, wherein said frame member
(12) consists of a pipe frame with a portion formed into a handle
(14).
Description
TECHNICAL FIELD
[0001] The present invention relates to a core for a caddie bag and
a caddie bag using the core. More particularly, the present
invention relates to a core structure for a caddie bag that is
improved in rigidity while preventing or limiting to the utmost, an
increase in the weight, and to a caddie bag using that core
structure.
BACKGROUND ART
[0002] According to the recent spread-out view in door-to-door
delivery services, caddie bags have often been delivered to and
from golf courses using the delivery systems. When players drive to
the golf course, a plurality of caddie bags are loaded up in the
trunk. Under these circumstances, caddie bags may be roughly
handled by the delivery service, or left inside the trunk in which
the temperature may exceed 60.degree. C. in summer and go under
-10.degree. C. in winter, which will result in deformation and
breaks of the caddie bags during transportation.
[0003] From the standpoint of preventing such deformation, a soft
material that may suffer deformation can be used as a core
structure of the caddie bag as long as the deformation can be
restored. On the other hand, any rigid material will be unsuitable
for the core structure if it does not recover once it is deformed.
In view of protection of golf clubs, a core structure that permits
no deformation is ideal. To satisfy these conditions, empirically
0.9 thick polypropylene has conventionally been used, as it is
light in weight and exhibits good recovery from deformation.
[0004] When caddie bags suffer more deformation and breaks as
described above, however, it is necessary to increase the rigidity
of the core structure of the caddie bags. Ways to improve the
rigidity of the caddie bags include: to use a thick core structure;
to add reinforcements to the core structure; and to use a material
of high modulus of elasticity as a raw material of the core.
[0005] More specifically, for a normal caddie bag having a diameter
of 8.5 inches (i.e., a bottom diameter of 210 mm), a core structure
with a size of 720 mm (height) .times.690 mm (circumference)
.times.0.9 mm (thickness) is needed, including a 30 mm seam
allowance for overlapping portions.
[0006] When it is made of a sheet of polypropylene, the core
structure weighs 407 g. When this core structure is actually sewn
into a cylindrical form, and if it is compressed toward the central
axis of the cylinder, a load by the compression when it is
displaced by 20 mm is 0.66 kgf. It can be said that this
compressive load value should be as large as possible to address
the above problem of the caddie bag.
[0007] A caddie bag largely consists of a core structure, a surface
material, and accessories including a belt. A normal caddie bag of
a diameter of 8.5 inches (i.e., a bottom diameter of 210 mm) with
the surface material and the accessories weighs approximately 3.0
kg, in which the weight of the core structure accounts for 13% of
the total weight of the caddie bag. A so-called lightweight caddie
bag weighs about 2.0 kg including its surface material and the
accessories, where the core structure comprises 20% of the total
weight.
[0008] If a thick core structure is used or reinforcements are
added to the core as described above in order to improve the
rigidity of the caddie bag, the weight of the core naturally
increases, which will result in increased weight of the entire
caddie bag.
[0009] If a material of high modulus of elasticity is used as a raw
material of the core, it will be difficult to roll the material as
well as to machine-stitch it into a cylindrical form, thus
degrading its workability. Furthermore, such material of high
modulus of elasticity will increase unit price.
[0010] Accordingly, a main object of the present invention is to
provide a caddie bag free from deformation and breaks, by
considering a core structure that is improved in rigidity without
increasing its weight and by considering the structure of the
core.
DISCLOSURE OF THE INVENTION
[0011] One aspect of the present invention is directed to a core
structure for a caddie bag, which includes a PCCP
(Pseudo-Cylindrical Concave Polyhedral) structure. The core
structure according to embodiments of the present invention can be
constructed entirely or partially of the PCCP structure, with a
smooth second material without the PCCP structure superposed on
either one or both of the outer surface and the inner surface of
the core structure.
[0012] Another aspect of the present invention is directed to a
core structure of a caddie bag, which includes a plurality of arc
portions having the PCCP structure, and a hinge portion without the
PCCP structure for connecting the plurality of arc portions
together. The hinge portion is bent to shape the core structure
into a cylindrical form. A smooth, second core structure without
the PCCP structure can be superposed on either one or both of the
outer and the inner surfaces of the core structure.
[0013] Yet another aspect of the present invention is directed to a
caddie bag that has a core structure configured to have the PCCP
structure. According to a more preferred embodiment, the caddie bag
is formed into a cylindrical form, with one end having an opening
provided with a collar, and the other end closed by a bottom
member, and the collar and the bottom member are connected to each
other by a frame member.
[0014] The core structure of the caddie bag is fabricated entirely
or partially of the PCCP structure. The core structure includes a
plurality of arc portions having the PCCP structure, and a hinge
portion without the PCCP structure that connects the plurality of
arc portions together. The hinge portion is bent to shape the core
into a cylindrical form. The frame member is detachable, and made,
for example, of a pipe frame, with a portion formed into a
handle.
BREIF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a partially cut-away view of a caddie bag using a
core having a PCCP structure according to an embodiment of the
present invention.
[0016] FIG. 2 is a spread-out view of the core used for the caddie
bag shown in FIG. 1.
[0017] FIG. 3A is a front view of the core shown in FIG. 2 that is
shaped into a cylindrical form, and FIGS. 3B to 3D are top plan
views of the core.
[0018] FIG. 4 is a rear view of the core for a caddie bag having
the PCCP structure, according to another embodiment.
[0019] FIG. 5 is a front view of the core for a caddie bag having
the PCCP structure, according to yet another embodiment.
[0020] FIG. 6 is a spread-out view illustrating how three arc
portions having the PCCP structure are connected by a hinge
portion.
[0021] FIG. 7 is a cross sectional view taken along the line A-A of
FIG. 6.
[0022] FIG. 8 is a side view of a caddie bag with a collar and a
bottom member attached to the core structure.
[0023] FIG. 9 is a side view of the caddie bag shown in FIG. 8 with
a pipe frame connected thereto.
[0024] FIG. 10 is a side view of the caddie bag shown in FIG. 9
with a pocket attached thereto.
[0025] FIG. 11 is a perspective view of a cylindrical form having
the PCCP structure.
[0026] FIGS. 12A to 12D are spread-out views of the cylindrical
form having the PCCP structure as shown in FIG. 11.
BEST MODES FOR CARRYING OUT THE INVENTION
[0027] In the present invention, a PCCP structure has been used as
a core of a caddie bag. Here, PCCP is an abbreviation of
"Pseudo-Cylindrical Concave Polyhedral" structure. The PCCP
structure is described in detail in "INSTITUTE OF SPACE AND
AERONAUTICAL SCIENCE UNIVERSITY OF TOKYO" REPORT No. 442
(1969).
[0028] FIG. 11 is a diagram of a cylindrical form having the PCCP
structure, and FIGS. 12A to 12D are spread-out views of the
cylindrical form having the PCCP structure.
[0029] As shown in FIG. 11, the PCCP structure is generally
cylindrical in a macroscopic sense, but it is actually formed of
pairs of triangles arranged into diamond patterns, or pairs of
trapezoids arranged into hexagonal patterns (not shown). In FIGS.
12A to 12D, solid lines except for the outlines represent "ridges,"
whereas dotted lines represent "valleys." In the PCCP structure
consisting of triangles arranged into diamond patterns, the
cylindrical form is constructed with bases 81 of the triangles as
the valleys and hypotenuses 82 thereof as the ridges, as shown in
FIG. 12A or 12C.
[0030] In the PCCP structure with trapezoids arranged into
hexagonal patterns, the lower bases 91 of the trapezoids serve as
the valleys and the upper bases 92 and hypotenuses 93 serve as the
ridges to constitute the cylindrical form, as shown in FIG. 12B or
12D. A cylindrical form having such a PCCP structure
characteristically increases its rigidity towards the central axis
of the cylinder, compared with that of a cylindrical form made of a
smooth core structure of the same thickness. Therefore, the PCCP
structure is uniquely suited for construction of the caddie bag
core shaped into the cylindrical form. This core having the PCCP
structure makes it possible to design the caddie bag to have
improved rigidity towards the central axis of the cylinder, while
minimally increasing the weight of the bag.
[0031] Although the vertexes of ridges and valleys have obtuse
angles in FIGS. 12A to 12D, these portions may be configured as
convex and concave arcs.
[0032] Furthermore, since the rigidity of the core structure
towards the center of the cylinder is improved compared with a
conventional core having the same thickness, if the same rigidity
as the conventional one is desired, the core structure can be made
thinner, and hence, made lighter in weight. These facts are listed
in Table 1.
1 TABLE 1 Width of Compressive Load Core When toward Central Axis
Polypropylene Base Height Length of Developed + of the Cylinder
Compressive Sheet Bottom Total Of Of Core When Seam (When Displaced
by Strength per Thickness Gravity Diameter Height Triangle Triangle
Developed Allowance Weight 20 mm) Unit Weight Unit mm mm mm mm mm
mm mm g kgf .times. 10.sup.-5 kgf/(mm .multidot. g) PCCP1 0.9 0.91
210 720 64.9 30.4 730 679 406 3.08 37.5 PCCP2 0.9 0.91 210 720 80.4
31.0 745 673 411 5.75 70.8 Cylindrical 0.9 0.91 210 720 -- -- 720
690 407 0.66 8.1 Core "a" Cylindrical 1.5 0.91 210 720 -- -- 720
690 678 -- -- Core "b" Cylindrical 1.85 0.91 210 720 -- -- 720 690
836 -- -- Core "c"
[0033] Table 1 compares conventional cylindrical cores having
smooth surfaces with those having the PCCP structure. All the cores
are of 210 mm in diameter, 720 mm in height and 0.9 mm in
thickness, and each formed of a polypropylene sheet.
[0034] The cylindrical core PCCP1 having the PCCP structure used in
the experiment has a form as shown in FIG. 11, and consists of
identical isosceles triangles each with a base of 64.9 mm and a
height (h) of 30.4 mm. This cylindrical core PCCP1 weighs 406 g,
which is almost equal to the weight, 407 g, of the conventional
cylindrical core "a".
[0035] Suppose that the circumferences of those cores are
compressed and displacement of 20 mm is attained in each core. In
that case, the normal cylindrical core "a" requires a load of 0.66
kgf, while the core PCCP1 with the PCCP structure requires that of
3.08 kgf.
[0036] Derived from dividing each of these load values by the
displacement value and further by the weight of the corresponding
core is compressive strength of the core per unit weight. As seen
in Table 1, the compressive strength of the normal cylindrical core
"a" is 8.1.times.10.sup.-5 kgf/(mm.multidot.g), whereas that of
PCCP1 is 37.5.times.10.sup.-5 kgf/(mm.multidot.g). Thus, it can be
said that the cylindrical core PCCP1 made with the PCCP structure
considerably increases the compressive strength, by about 4.6 times
in this case, without increasing the weight of the core.
[0037] If a cylindrical core with a conventional smooth surface is
formed so as to have rigidity identical to that of the above
cylindrical core PCCP1 having the PCCP structure (both cores being
made of identical polypropylene sheets), the thickness of this
smooth cylindrical core "b" can be calculated as follows. When a
cross-section secondary moment of the cylindrical core with the
PCCP structure is expressed as Ip and that of the smooth
cylindrical core as Ia, the following equation can be given from
Table 1:
Ip=4.6.times.Ia (1)
[0038] The cross-section secondary moment Ia of the smooth
cylindrical core with a height of 2H and a thickness of Ta is
calculated as follows:
Ia=(h.times.Ta.sup.3).div.6 (2)
[0039] From the above equations (1) and (2), the cross-section
secondary moment Ip of the cylindrical core with the PCCP structure
is expressed as follows:
Ip=(4.6.times.h.times.Ta.sup.3).div.6 (3)
[0040] Since the cross-section secondary moment Ib of a smooth
cylindrical core with a height of 2h and a thickness of Tb is
calculated as:
Ib=(h.times.Ta.sup.3).div.6, (4)
[0041] if this moment Ib of the smooth cylindrical core is
identical to the moment Ip of the cylindrical core having the PCCP
structure, i.e.,
Ib=Ip, (5)
[0042] we have the following equations from the equations (3), (4)
and (5):
(h.times.Ta.sup.3).div.6=(4.6.times.h.times.Ta.sup.3).div.6
Ta.sup.3=4.6Ta.sup.3
[0043] Here, if Ta=0.9 mm, we have
[0044] Tb=1.50 mm.
[0045] As a result, the smooth cylindrical core "b" having the same
rigidity as the PCCP1 has a thickness of 1.50 mm, and it weighs 678
g. The 0.9 mm thick PCCP1, on the other hand, weighs 406 g. Their
difference in weight is 272 g, which brings about 40% weight
reduction.
[0046] Another cylindrical core PCCP2 having the PCCP structure
consists of identical isosceles triangles each having a base of
80.4 mm and a height (h) of 31.0 mm. It can be seen from Table 1
that this PCCP2 has compressive strength per unit weight about 8.7
times that of the normal smooth cylindrical core "a". Now, a
cylindrical core "c" having a smooth surface is made to have the
same compressive strength as that of the PCCP2. According to
calculations similar to those above, a polypropylene sheet used to
make the core "c" has a thickness of 1.85 mm, and the core "c"
weighs 836 g, as shown in Table 1. The PCCP2 with the PCCP
structure, on the other hand, weighs only 411 g. Their difference
in weight is 425 g, and thus, 51% weight reduction can be
achieved.
[0047] As apparent from the above examples, in the case of a
cylindrical core with the PCCP structure, the rigidity towards the
central axis of the cylinder varies as the shape of isosceles
triangles constituting the PCCP structure changes. In other words,
with the cylindrical cores having the same bottom diameters, those
having triangles with shorter bases 81 and greater height h, i.e.,
the cylindrical cores having smoother surfaces exhibit greater
resistance against compression in the longitudinal direction of the
caddie bag. In contrast, the cylindrical cores having triangles
with longer bases 81 and smaller height h are more resistant to
compression from the side surfaces.
[0048] As the core of the caddie bag, it is desirable that the
cylindrical form have a maximum resistance against compression from
the side surfaces. It also needs to have sufficient compressive
strength to prevent buckling when it is weighted with a person
lengthwise. Therefore, the shape of the isosceles triangles
constituting the PCCP structure should be determined by finding a
good balance between these two constraints, which in turn will
allow a certain degree of freedom in designing.
[0049] Hereinafter, specific embodiments of the present invention
will be described.
[0050] FIG. 1 is a partially cut-away view of a caddie bag 1 having
a normal diameter of 8.5 inches (a bottom diameter of 210 mm),
using a core having a PCCP structure 2. For caddie bag 1 shown in
FIG. 1, a sheet of synthetic resin of 720 mm (height).times.690 mm
(circumference) is prepared, which is fabricated with PCCP
structure 2. This sheet of synthetic resin with PCCP structure 2 is
sewn into a cylindrical form to be used as a core 3 of the caddie
bag. Next, this core structure is inserted into surface leather
with a back bag and a pocket stitched thereto. The surface leather
and the core structure now in the cylindrical form are provided
with a collar portion and a bottom portion stitched thereto,
whereby the caddie bag is finished.
[0051] In FIG. 2, the synthetic resin sheet with PCCP structure 2
has an overlapping portion 4 where no PCCP structure 2 is provided.
Having a 25 mm to 100 mm wide smooth surface as overlapping portion
4 not only allows easier machine-stitching or riveting, but also
makes possible adjustment of the portion to be overlapped to
correspond to caddie bags in different sizes. Moreover, if weight
reduction is required, unnecessary overlapping portion 4 can be cut
out. If additional strength is required, overlapping portion 4 can
be left longer than what is needed.
[0052] In FIG. 2, seam allowances for collar portion 5 and bottom
portion 6 also have smooth surfaces without PCCP structure 2, the
purpose of which is also to ease stitching.
[0053] FIG. 3A is a front view of the above-described synthetic
resin sheet that is rolled into a cylindrical form to be used as
core 3 of a caddie bag. Other than this kind of embodiment, it is
also possible to implement an embodiment having overlapping portion
4, collar portion 5 and bottom portion 6 all left with PCCP
structure 2.
[0054] As shown in FIG. 3B, it is also possible to constitute a
double-layered structure by superposing a smooth second core 8
without the PCCP structure on the inner surface of core 3 having
the PCCP structure. Such a double-layered structure can enjoy
inconsistent characteristics that, on one hand, the core 3 with the
PCCP structure exhibits greater compressive strength against
compression from the side surface, and on the other hand, the
smooth second core 8 exhibits greater compressive strength
lengthwise. In addition, even if the outer core 3 with the PCCP
structure is pushed in, such deformation is expected to be restored
because of the bounce of the second, smooth core 8 on the inner
side. The double-layered structure is suited for a caddie bag,
since it minimizes damages against golf clubs when they are being
taken out of the bag. Otherwise, the contact of the clubs with the
exposed hard core 3 would cause considerable damages to the
clubs.
[0055] Furthermore, it is also possible to constitute a
double-layered structure by superposing a second smooth core 9
without the PCCP structure on the outer surface of the core 3
having the PCCP structure, as shown in FIG. 3C. This type of
double-layered structure improves rigidity against compression in
both horizontal and vertical directions, as described above. In
addition, it prevents the uneven shape of the PCCP structure 2 from
being visible on the surface of the caddie bag as a finished
product.
[0056] Still further, it is possible to constitute a triple-layered
structure by superposing on the inner and outer surfaces of core 3
having the PCCP structure, a smooth core 8 without the PCCP
structure and an identical core 9 without the PCCP structure,
respectively, as shown in FIG. 3D. The PCCP structure may be
provided entirely or partially on the surface of any core of a
caddie bag, depending on rigidity required for that caddie bag. A
core partially provided with the PCCP structure may also be
overlaid with a smooth core, on either its inner or outer surface
to constitute a double-layered structure, or, on both its surfaces
to constitute a triple-layered structure.
[0057] FIG. 4 is a back view of a cylinder made of core 3 provided
with the PCCP structure 2 in approximately half of the structure
starting from the bottom. In this embodiment, overlapping portions
4 are made smooth, without the PCCP structure 2. This PCCP
structure 2 provided only in approximately half of the structure at
the bottom is intended to increase the rigidity in the
corresponding portion of the caddie bag, since pockets will be
attached to the portion, and thus, especially serious deformation
and breaks are expected there.
[0058] FIG. 5 shows an example of core 3 having PCCP structure 2
with isosceles triangles of different shapes in different portions
according to structural requirements. In the embodiment shown in
FIG. 5, core 3 has triangles with greater heights in approximately
one-third of the core at the top, so as to increase compressive
strength lengthwise. Below this one-third portion down to a smooth
portion 7, it has a normal PCCP structure, and below the smooth
portion 7 to the bottom, the triangles are made to have longer
bases to obtain greater resistance to compression from the side
surface. Thus, by changing the lengths of bases of the isosceles
triangles constituting the PCCP structure 2, rigidity of caddie bag
core 3 can be designed more meticulously, section by section.
[0059] FIG. 6 shows a developed view of three arc portions with the
PCCP structure connected to one another by a hinge portion. FIG. 7
is a cross sectional view taken along the line A-A in FIG. 6.
[0060] In the embodiment shown in FIG. 6, caddie bag core 3 is
divided into three portions, i.e., arc portions 31, 32 and 33,
which are connected to one another by a hinge portion 34. The PCCP
structure has an inherent problem that, when a core having the PCCP
structure is formed into a cylindrical form, the lengthwise
dimension of the cylindrical form varies as its radius of curvature
changes. Accordingly, this embodiment includes hinge portion 34 and
enables only this hinge portion 34 to bend, while portions 31, 32
and 33 with the PCCP structure are curved in advance. In this
manner, the radius of curvature of arc portions 31, 32 and 33 are
prevented from changing, so that distortion between the arc
portions and the smooth, hinge portion 34 is eliminated. This
solves the problem with lengthwise varying dimension.
[0061] Provision of hinge portion 34 can further increase rigidity
of the caddie bag lengthwise, since hinge portion 34 serves as a
rib. Though an example with three arc portions 31-33 has been
described, it should be understood that the core may be divided
into any number of sections, e.g., from 2 to 5.
[0062] FIG. 8 is a side view of a caddie bag with a collar attached
to the caddie bag core. FIG. 9 is a side view of the caddie bag
shown in FIG. 8 with a pipe frame connected thereto. FIG. 10 is a
side view of the caddie bag of FIG. 9 with pockets attached
thereto.
[0063] As shown in FIG. 8, a collar 51 and a bottom 61 are attached
to core 3 with the PCCP structure 2, at the top and the bottom,
respectively. This structure can readily be used as caddie bag 1,
since such PCCP structure 2 guarantees large resistance to
compression from the side surfaces.
[0064] As shown in FIG. 9, a pipe frame 12 is connected to caddie
bag 1, to protect caddie bag 1 from compression lengthwise. If pipe
frame 12 is detachable from the body of caddie bag 1 at a
connecting portion employing a hook, zipper, release buckle, or
adjustment buckle, it becomes possible to detach pipe frame 12 and
to load a cart only with the body of caddie bag 1 when playing on a
course.
[0065] A portion of pipe frame 12 may be bent to provide a handle
14. Using this handle 14 made of the highly rigid pipe frame, it is
possible to carry caddie bag 1 more stably.
[0066] In addition to pipe frame 12, an auxiliary frame 13 may be
provided. This can further protect caddie bag 1 from compression in
both horizontal and vertical directions. Though iron, aluminum,
FRP, acrylonitrile butadiene styrene (ABS), polyvinyl chloride,
polycarbonate, and polyamide may be used as a material of pipe
frame 12, aluminum is preferable for its strength, gravity,
workability, and thermostability. Pipe frame 12 is made of a
plurality of parts, which are assembled by welding, riveting, or
using joint parts.
[0067] Furthermore, as shown in FIG. 10, pockets for storing golf
accessories, such as golf balls, gloves and rain wares, may be
attached to pipe frame 12 or auxiliary frame 13, or, although not
shown, mounted on the body of the caddie bag.
[0068] Moreover, in addition to changing shapes of isosceles
triangles constituting the PCCP structure corresponding to design
goals, as explained above, it is also possible to constitute the
PCCP structure with simple triangles or trapezoids, instead of the
isosceles triangles.
[0069] For a synthetic resin sheet as the material of caddie bag
core 3, polypropylene, polyethylene, ABS, polyvinyl chloride,
polycarbonate, polyamide, and polyethylene tereftarate may be used.
Among them, polypropylene is most preferable due to its price,
fabricating process, gravity, modulus of elasticity, and
thermostability.
[0070] As a method of providing the synthetic resin sheet with the
PCCP structure, vacuum molding, molding under compressed air, and
blow molding are available. Vacuum molding is preferable when
taking into consideration ease in transportation and storage after
molding, investment for a mold, applicability to different sizes of
caddie bags, use of expanded synthetic resin sheet, and moldability
in multi-layers by overlaying layers of different materials on
inner and outer surfaces of the core. For molding in multi-layers
by overlaying layers of different materials on only one side of the
core, injection press molding is suitable because of its simplicity
of the overlaying process.
[0071] Blow molding is suitable for assuring a uniform cylindrical
form without a seam, ease in adjustment of the thickness of the
core, and reduction in number of the process steps after formation
of the PCCP structure.
[0072] Industrial Applicability
[0073] As explained above, according to the present invention, a
core structure for a caddie bag with the PCCP structure exhibits
higher rigidity towards the central axis of the cylinder compared
with a core structure having a smooth surface of the same
thickness. Therefore, employing the PCCP structure, it is possible
to design a caddie bag with improved rigidity towards the central
axis of the cylinder while minimizing the increase in the weight.
It is also possible to have a lightweight core structure, and
hence, a lightweight caddie bag. Cost reduction can be achieved
because there is no need to use an expensive high-strength material
or a reinforcement.
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