U.S. patent application number 10/561592 was filed with the patent office on 2006-06-29 for coupling/uncoupling method, plastic coupler and envelop, bag and binder.
This patent application is currently assigned to ISHIZAKI SHIZAI CO.,LTD.. Invention is credited to Akira Ishizaki, Shingo Ishizaki.
Application Number | 20060137150 10/561592 |
Document ID | / |
Family ID | 33524185 |
Filed Date | 2006-06-29 |
United States Patent
Application |
20060137150 |
Kind Code |
A1 |
Ishizaki; Akira ; et
al. |
June 29, 2006 |
Coupling/uncoupling method, plastic coupler and envelop, bag and
binder
Abstract
A plastic fastener having a first segment 10A with a protrusion
12 formed on a first base 11, the protrusion 12 having a stopper
hook on its end and having identical sections in a direction shown
by arrow B, and a second segment 10B with a groove 16 formed on a
second base 15, the groove being for nipping the hook of the
protrusion 12 and having identical section in the direction shown
by arrow B. The protrusion 12 and the groove 16 come into
engagement with each other by pressures in directions shown by A
and A' applied from respective back sides of the first base 11 and
the second base 15, and the engagement is not canceled by forces in
directions opposite to the directions A and A'. The engagement can
be canceled only by sliding the protrusion 12 together with the
first base 11 and the groove 16 together with the second base 15 in
directions shown by arrow B and B'.
Inventors: |
Ishizaki; Akira;
(Kashiba-shi, JP) ; Ishizaki; Shingo;
(Kashiba-shi, JP) |
Correspondence
Address: |
BUCHANAN INGERSOLL PC;(INCLUDING BURNS, DOANE, SWECKER & MATHIS)
POST OFFICE BOX 1404
ALEXANDRIA
VA
22313-1404
US
|
Assignee: |
ISHIZAKI SHIZAI CO.,LTD.
15-43, Asahigaoka 3-come Kasiwara-shi
Osaka
JP
582-0026
|
Family ID: |
33524185 |
Appl. No.: |
10/561592 |
Filed: |
June 24, 2003 |
PCT Filed: |
June 24, 2003 |
PCT NO: |
PCT/JP03/08013 |
371 Date: |
December 20, 2005 |
Current U.S.
Class: |
24/585.1 |
Current CPC
Class: |
Y10T 24/45157 20150115;
A45C 13/1023 20130101; B65D 33/25 20130101; A44B 18/0053 20130101;
A44B 19/16 20130101 |
Class at
Publication: |
024/585.1 |
International
Class: |
A44B 19/00 20060101
A44B019/00 |
Claims
1. A fastening/unfastening method using a plastic fastener
comprising a first segment produced by extrusion molding a long
first segment such that a first base and a protrusion formed on a
front surface of the first base have identical sections in one
direction and by cutting the long first segment into pieces with a
specified length, and a second segment produced by extrusion
molding a long second segment such that a second base and a groove
formed on a front surface of the second base have identical
sections in one direction and by cutting the long second segment
into pieces with a specified length, wherein: the protrusion and
the groove are engaged with each other by pressures applied from
respective back sides of the first base and the second base; and
the engagement of the protrusion and the groove is canceled only by
sliding the protrusion together with the first base in the
direction where the protrusion has identical sections and by
sliding the groove together with the second base in the direction
where the groove has identical sections.
2. A fastening/unfastening method according to claim 1, wherein:
the engagement of the protrusion with the groove by pressures the
engagement of the protrusion with the groove by pressures applied
from the respective back sides of the first base and the second
base is not canceled in directions opposite to the pressing
directions for the engagement; and the engagement of the protrusion
and the groove is canceled only by sliding the protrusion together
with the first base in the direction where the protrusion has
identical sections and by sliding the groove together with the
second base in the direction where the groove has identical
sections.
3. A plastic fastener comprising a first segment produced by
extrusion molding a long first segment such that a first base and a
protrusion formed on a front surface of the first base and having a
stopper hook on its end have identical sections in one direction
and by cutting the long first segment into pieces with a specified
length, and a second segment produced by extrusion molding a lone
second segment such that a second base and a groove formed on a
front surface of the second base to nip the stopper hook of the
protrusion have identical sections in one direction and by cutting
the long second segment into pieces with a specified length,
wherein: the protrusion and the groove are engaged with each other
by pressures applied from respective back sides of the first base
and second base; and the engagement of the protrusion and the
groove is canceled only by sliding the protrusion together with the
first base in the direction where the protrusion has identical
sections and by sliding the groove together with the second base in
the direction where the groove has identical sections.
4. A plastic fastener according to claim 3, wherein each of the
first base and the second base has a plurality of protrusions
formed side by side thereon, so that grooves are made between the
protrusions on each of the first base and the second base.
5. A plastic fastener according to claim 3, wherein the first
segment with the protrusion on the first base and the second
segment with the groove on the second base have identical sections
with each other.
6. A plastic fastener according to claim 3, wherein adhesive layers
are provided on the respective back sides of the first base and the
second base.
7. An envelope comprising a main body and a lid for covering an
opening portion of the main body, further comprising: the first
segment and the second segment as set forth in claim 3 on the main
body and on the lid, respectively, at positions opposite to each
other.
8. A bag comprising the first segment and the second segment as set
forth in claim 3 on an inner surface in an opening portion, at
positions opposite to each other.
9. A tie comprising the first segment and the second segment as set
forth in claim 3 on both ends, respectively.
Description
TECHNICAL FIELD
[0001] The present invention relates to a fastening/unfastening
method, a plastic fastener, an envelope, a bag and a tie. More
specifically, the present invention relates to a
fastening/unfastening method which permits easy and sufficiently
strong fastening of various kinds of parts made of various
materials to each other, such as fastening of a lid of an envelope
to its main body, fastening of a pair of films composing an opening
of a bag to each other and fastening of a lid of a container to its
main body, while permitting easy unfastening, and a plastic
fastener.
BACKGROUND ART
[0002] Conventionally, various kinds of fasteners have been
provided, and a typical example thereof is a metal or a plastic
snap fastener. Usually, a snap fastener is composed of a male part
and a female part. By pressing the male and female parts against
each other, the snap fastener works to join things together, and by
pulling these parts in the opposite directions, the snap fasteners
works to unfasten the things from each other.
[0003] The snap fastener, however, has the following disadvantages.
When the male and female parts are pulled for unfastening, tensil
forces are applied to base material, such as cloth, to which the
male part and the female part are fitted. Therefore, the base
material must be rigid enough to withstand the tensil forces.
Accordingly, it is impossible to attach the snap fastener to
elastic material, such as rubber. Also, if the male part and the
female part of the snap fastener have a strong engagement power,
corresponding tensil forces are necessary to cancel the engagement,
and the base material must be rigid enough to withstand the tensil
forces.
[0004] Further, when this kind of snap fastener is attached to base
material, it is necessary to position the male part and the female
part separately. Accordingly, a complicate transport/alignment
system is necessary, and this is a cause of a high manufacturing
cost. Further, the snap fastener is fitted to base material by
nipping the base material or by sewing the snap fastener on the
base material, and it is difficult to fit the snap fastener to, for
example, a mesh bag or a paper bag. Moreover, the snap fastener has
a thickness of at least 5 mm when the male part and the female part
are in engagement with each other, and the portion where the snap
fastener is fitted is bulky. Therefore, a large space is necessary
to store products with these snap fasteners fitted.
[0005] Meanwhile, a fastener which requires only a weak power for
unfastening while having a sufficiently strong fastening power,
which is not bulky, which is possible to fit to soft and elastic
base material such as a film or a paper sheet has been
demanded.
DISCLOSURE OF THE INVENTION
[0006] An object of the present invention is to provide a
fastening/unfastening method and a plastic fastener which require
only a small power for unfastening while having a large fastening
power and which are applicable to various kinds of base material
such as films and sheets.
[0007] Another object of the present invention is to provide a
plastic fastener which is thin and not bulky, which is easy to
produce at low cost and which is easy to fit to base material.
[0008] Another object of the present invention is to provide an
envelope, a bag and a tie with plastic fasteners which require only
a small power for unfastening while having a large fastening
power.
[0009] In order to attain the objects, the present invention
provides a fastening/unfastening method using a plastic fastener
comprising a first segment having a protrusion formed on a first
base, the protrusion having identical sections in one direction and
a second segment and a groove formed on the second base, the groove
having identical sections in one direction. In the method, the
protrusion and the groove are engaged with each other by pressures
applied from respective back sides of the first base and the second
base, and the engagement of the protrusion and the groove is
canceled by sliding the protrusion together with the first base in
the direction where the protrusion has identical sections and by
sliding the groove together with the second base in the direction
where the groove has identical sections.
[0010] The fastening/unfastening method according to the present
invention is a novel method, wherein a protrusion and a groove are
engaged with each other by pressures applied to the protrusion and
the groove perpendicularly from mutually opposite directions, while
the protrusion and the groove are disengaged from each other by
sliding of the protrusion and the groove in directions
perpendicular to the pressing directions for the engagement.
[0011] In order to carry out the fastening/unfastening method
according to the present invention, a short piece cut out from a
plastic zipper which has a protrusion and a groove to be
engaged/disengaged with/from each other and which has been
conventionally used to close an opening of a plastic bag can be
used. In closing/opening the plastic zipper, pressures/tensil
forces are applied to the protrusion and the groove perpendicularly
so as to engage/disengage the protrusion and the groove with/from
each other. In the fastening/unfastening method according to the
present invention, however, in order to disengage the protrusion
and the groove from each other, the protrusion and the groove are
slid in directions perpendicular to the pressing directions for the
engagement. Thus, the fastening/unfastening method according to the
present invention is different from a conventional method in the
directions of forces applied for the disengagement of the
protrusion and the groove from each other. According to the present
invention, strength of engagement corresponding to the length of
the cut piece (the length of the protrusion and the groove) is
guaranteed, while for disengagement, only a weak power is necessary
to slide the protrusion and the groove.
[0012] In the fastening/unfastening method according to the present
invention, the protrusion and the groove which are engaged with
each other by the pressures applied from the respective back sides
of the first base and the second base do not necessarily have
shapes which permit themselves to be released from the engagement
by forces in directions opposite to the pressing directions for the
engagement. In other words, the protrusion and the groove can be of
shapes which prohibit themselves from being released from the
engagement by forces in directions opposite to the pressing
directions for the engagement. Making the protrusion and the groove
in such shapes guarantees so strong engagement of the protrusion
and the groove not to be canceled easily. Disengagement of the
protrusion and the groove from each other is possible only by
sliding of the protrusion together with the first base and sliding
of the groove together with the second base.
[0013] A plastic fastener according to the present invention
comprises a first segment having a first base and a protrusion
formed on the first base, said protrusion having a stopper hook at
its end and having identical sections in one direction, and a
second segment having a second base and a groove formed on the
second base, said groove being for nipping the hook of the
protrusion and having identical sections in one direction. In the
plastic fastener, the protrusion and the groove are engaged with
each other by pressures applied from respective back sides of the
first base and second base, and the engagement of the protrusion
and the groove is canceled only by sliding of the protrusion
together with the first base in the direction where the protrusion
has identical sections and sliding of the groove together with the
second base in the direction where the groove has identical
sections.
[0014] In the plastic fastener according to the present invention,
the protrusion and the groove are pressed against each other from
mutually opposite directions, and thereby, the protrusion and the
groove come into engagement with each other. Then, the engagement
is canceled only by sliding of the protrusion and the groove in
directions perpendicular to the pressing directions for the
engagement. Thus, the faster secures so strong engagement not to be
canceled easily by forces in directions opposite to the pressing
directions for the engagement. On the other hand, only a weak power
is necessary to slide the protrusion and the groove in the
directions where the protrusion and the groove have identical
sections, respectively, so as to disengage the protrusion and the
groove from each other. Therefore, this plastic fastener can be
used to fasten things made of soft or elastic material, such as
films and sheets. The bases of the fastener can be fixed on a
plastic bag or a plastic container easily by fusing as long as the
plastic material of the bag or the container is fusable with the
plastic material of the fastener, and this plastic fastener is
especially suited as a fastener for a plastic bag and a plastic
container.
[0015] The plastic fastener according to the present invention is
only about 2 mm in thickness including the first base and the
second base when the protrusion and the groove are in engagement
with each other. Compared with conventional snap fasteners (5 mm to
7 mm in thickness), the plastic fastener is very thin, and when the
plastic fastener is fitted to base material, the fastener is not
bulky.
[0016] Also, by adopting a method wherein after the first base and
the second base are engaged with each other, the mutually engaged
bases are fused or bonded with base material, the first segment and
the segment can be handled as one part. More specifically, while
cutting a pair of long bases with a protrusion and a groove engaged
with each other into pieces of a necessary length, the cut pieces
are fitted to base material one by one. Thus, the fastener fitting
process is easy, and this process is much less costly than
conventional fastener fitting processes.
[0017] Also, a plurality of protrusions may be formed on each of
the first base and the second base such that grooves are made
between the protrusions. In this case, the plurality of protrusions
are engaged with the plurality of grooves, and the range of
engagement is wide.
[0018] The first segment with a first base and a protrusion and the
second segment with a second base and a groove may have identical
sections with each other. Segments of one kind can be used as the
first segment and as the second segment.
[0019] Further, on each of the back sides of the first base and the
second base, an adhesive layer and if necessary, a separating sheet
may be provided. In this case, the first base and the second base
can be fitted to base material easily only by removing the
separating sheets.
[0020] The plastic fastener can be produced by molding the first
base and the protrusion integrally and by molding the second base
and the groove integrally by extrusion molding of melted plastic
material from a mold in one direction.
[0021] Alternatively, on a plastic film, melted plastic material
may be extruded from a mold in one direction, so that a protrusion
and a groove are formed on the film after the extruded plastic
material cools and hardens.
[0022] These manufacturing processes permit a use of facilities for
manufacturing conventional plastic zippers, and this enables easy
and costless mass production of plastic fasteners according to the
present invention. In these manufacturing processes, a long plastic
fastener is produced, and the long fastener shall be cut into
pieces with a proper length.
[0023] An envelope according to the present invention comprises a
main body and a lid for covering an opening portion of the main
body, and the first segment and the second segment of the
above-described plastic fastener are provided on the main body and
on the lid, respectively, at positions opposite to each other.
[0024] A bag according to the present invention comprises the first
segment and the second segment of the above-described plastic
fastener on an inner surface in an opening portion, at positions
opposite to each other. The bag can be made of paper, a plastic
film, etc. The bag may further have a handle.
[0025] A tie according to the present invention comprises the first
segment and the second segment of the above-described plastic
fastener on both ends, respectively. The tie can be made of a
plastic film, elastic rubber, etc.
[0026] As well as these things, there are, for example, following
goods provided with plastic fasteners according to the present
invention:
[0027] plastic or cardboard containers of which lids are fastened
to their main bodies by the plastic fasteners;
[0028] labels, posters, sheets, etc., each of which has one of the
first and the second segments of the plastic fastener fitted on its
back side, which are to be stuck on a wall or a board with the
other segment of the fastener fitted thereon; and
[0029] clothes and gloves with the plastic fasteners substituting
hooks, buttons and zippers.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 is a perspective view of a plastic fastener according
to a first embodiment of the present invention.
[0031] FIGS. 2a and 2b show an envelope with the fastener of FIG.
1, FIG. 2a being a front view and FIG. 2b being an enlarged view of
an opening portion of the envelope.
[0032] FIG. 3 is a perspective view of the envelope of FIG. 2
showing an open motion of the envelope.
[0033] FIG. 4 is a front view of another exemplary envelope.
[0034] FIGS. 5a and 5b show a plastic bag with the fastener of FIG.
1, FIG. 5a being a front view and FIG. 5b being an enlarged view of
an opening portion of the bag.
[0035] FIG. 6 is a perspective view of another bag with the
fastener.
[0036] FIG. 7 is a perspective view of another bag with the
fastener.
[0037] FIG. 8 is a perspective view of clothes with the
fastener.
[0038] FIG. 9 is a front view of a glove with the fastener.
[0039] FIGS. 10a and 10b show a plastic container with the
fastener,
[0040] FIG. 10a being a perspective view when the container is
opened and
[0041] FIG. 10b being a perspective view when the container is
closed.
[0042] FIGS. 11a, 11b and 11c show a paper binder with the
fastener, FIG. 11a being a front view when the paper binder is
opened, FIG. 11b being a bottom view when the paper binder is
opened and FIG. 11c being a bottom view when the paper binder is
closed.
[0043] FIG. 12 is a perspective view of a bed sheet cover with the
fastener.
[0044] FIG. 13 is a perspective view of a plastic fastener
according to a second embodiment of the present invention.
[0045] FIG. 14 is an illustration showing an engagement range of
the fastener of FIG. 13.
[0046] FIG. 15 is a front view showing molding of fasteners as
shown by FIG. 13.
[0047] FIG. 16 is a perspective view of a molding machine for
molding fasteners as shown by FIG. 13.
[0048] FIG. 17 is a front view of a tie with the fastener shown by
FIG. 13.
[0049] FIG. 18 is a perspective view showing a process of
manufacturing ties as shown by FIG. 17.
[0050] FIG. 19 is a front view of the tie in use.
[0051] FIG. 20 is a front view of ties as shown by FIG. 17, showing
another example of usage of the tie.
BEST MODES FOR CARRYING OUT THE INVENTION
[0052] Referring to the accompanying drawings, embodiments of a
fastening/unfastening method, a plastic fastener and a
manufacturing method thereof according to the present invention are
described.
First Embodiment of Fastener; See FIG. 1
[0053] FIG. 1 is a plastic fastener 10 according to a first
embodiment of the present invention. The fastener 10 has a first
segment 10A and a second segment 10B. In the first segment 10A, a
protrusion 12 with a hook at the end is formed on a first base 11
such that sections of the protrusion 12 in a direction (see arrow
B) are identical. In the second segment 10B, a groove 16 for
nipping the hook of the protrusion 12 therein is formed on a second
base 15 such that sections of the groove 16 in a direction (see
arrow B) are identical.
[0054] Further, on the back sides of the bases 11 and 12, adhesive
layers 13 and 17 and separating sheets 14 and 18 are provided.
[0055] In producing the fastener 10, generally, melted plastic
material, such as polypropylene and polyethylene is extruded in one
direction from a mold. Thus, the base 11 and the protrusion 12 are
molded integrally, and the base 15 and the groove 16 are molded
integrally. The molded product is long, and the long product is cut
into pieces (fasteners 10) with a length of 1 cm to 2 cm in the
direction B.
[0056] When the fastener 10 is pressed from the back sides of the
bases 11 and 15 in directions shown by arrows A and A', the
protrusion 12 and the groove 16 come into engagement with each
other. The bulging width of the protrusion 12 is larger than the
opening width of the groove 16, and the protrusion 12 forces its
way into the groove 16 widening the opening of the groove 16.
Therefore, once the protrusion 12 and the groove 16 get in
engagement with each other, they will not be disengaged from each
other by forces in directions perpendicular to the pressing
directions for the engagement.
[0057] On the other hand, when the protrusion 12 and the groove 16
are slid in directions shown by arrows B and B' relatively to each
other, they are disengaged from each other with only a small power.
The bases 11 and 15, the protrusion 12 and the groove 16 are molded
out of the plastic material, and frictions among these parts are
small. Therefore, there is not a strong resistance in sliding the
bases 11 and 15 relatively to each other.
[0058] Further, the statement that once the protrusion 12 and the
groove 16 get in engagement with each other, they will not be
disengaged from each other by forces in directions perpendicular to
the pressing directions for the engagement means, for example, that
in a case shown by FIGS. 2a and 2b, the protrusion 12 and the
groove 16 are not disengaged from each other by an ordinary power
to open a lid 22 of an envelope 20.
(Envelope; See FIGS. 2a and 2b-4)
[0059] FIGS. 2a and 2b show an envelope 20 with the above-described
fastener 10. This envelope 20 has a lid 22 extending from an
opening portion of a main body 21. On the outer surface of the main
body 21, at the opening portion, the base 15 (the second segment
10B) of the fastener 10 with the separating sheet 18 removed is
stuck with its back side down. On the lid 22, the base 11 (the
first segment 10A) of the fastener 10 with the separating sheet 14
removed is stuck with its back side down. The bases 11 and 15 are
stuck such that the protrusion 12 and the groove 16 extend in an
extending direction of the opening portion of the envelope 20.
[0060] The fitting of the fastener 10 to the envelope 20 can be
carried out by while cutting extruded molds of the bases 11 and 15
into pieces with a length as shown in FIG. 1, sticking the cut
bases 11 and 15 on the lid 22 and on the main body 21
respectively.
[0061] The lid 22 is folded back from the state shown in FIGS. 2a
and 2b, and the back sides of the bases 11 and 15 are pressed to
engage the protrusion 12 and the groove 16 with each other. In this
way, the lid 22 is fastened to the main body 21. In order to
disengage the protrusion 12 and the groove 16 from each other, as
shown in FIG. 3, the portion where the fastener 10 is fitted is
nipped between fingers, and the lid 22 is slid in a direction shown
by arrow B.
[0062] Then, in order to close the envelope again, the bases 11 and
15 are pressed from the bask sides again to engage the protrusion
12 and the groove 16 with each other. For engagement and
disengagement, there are no steps where strong fricative force
and/or pressure are applied to the fastener 10, and there is little
possibility that repetitious engagement and disengagement will wear
the protrusion 12 and the groove 16.
[0063] Further, by putting a sticker 25 over the lid 22 and the
main body 21 while the lid 22 is fastened to the main body 21 by
the fastener 10 as shown in FIG. 3, unfastening of the lid 22 from
the main body 21 caused by sliding of the fastener 10 in the
direction shown by arrow B can be certainly prevented. Also, it is
apparent from the sticker 25 whether the envelope 20 has been
opened.
[0064] As FIG. 4 shows, it is possible to provide two fasteners 10
in two positions.
[0065] Also, the first segment 10A and the second segment 10B may
be stuck on either of the main body 21 and the lid 22. In each of
the following embodiments in which the fastener 10 is used, also,
the first segment 10A and the second segment 10B may be
exchangeable, and the above-description of the usage and the
operation of the fastener 10 can be adopted.
(Plastic Bag; See FIGS. 6a and 5b)
[0066] A plastic bag 30 is of a three-side fused type. In FIG. 5a,
the fused sides are shown as hatched portions. On the inner surface
of the bag 30, in the upper opening portion 31, the first segment
10A and the second segment 10B of the fastener 10 are fitted so as
to be opposite to each other.
[0067] The first segment 10A and the second segment 10B may be
bonded on the inner surface of the bag 30. However, if plastic
films 32 composing the bag 30 are fusable with the bases 11 and 15
of the fastener 10, it is possible to fuse the bases 11 and 15 with
the plastic films 32 automatically during a process of making the
bag 30. Further, the fastener 10 with the protrusion 12 and the
groove 16 engaged with each other may be put and bonded between the
films 32. In this case, the bases 11 and 15 can be fitted with no
fear of locating the segments 10A and 10B out of positions.
(Bag; See FIGS. 6 and 7)
[0068] FIGS. 6 and 7 show bags 40 and 45 with the fasteners 10. The
bags 40 and 45 are paper or plastic bags. In each of the bags 40
and 45, the first segment 10A and the second segment 10B are stuck
on the inner surface of the bag, in positions opposite to each
other.
(Clothes; See FIG. 8)
[0069] As FIG. 8 shows, the fastener 10 can be used as a snap
fastener or a button of clothes 50. The clothes with the fasteners
10 are especially suited for patients under someone's care.
(Glove; See FIG. 9)
[0070] FIG. 9 shows a polyethylene glove 55. The first segment 10A
and the second segment 10B are fitted to the glove 55 at an
arm-side portion 56. By engaging the segments 10A and 10B with each
other, the arm-side portion 56 can be squeezed.
(Plastic Container; See FIGS. 10a and 10b)
[0071] As FIGS. 10a and 10b show, the fastener 10 can be used to
fasten/unfasten a lid 62 to/from a main body 61 of a plastic
container 60. The lid 62 is capable of rotating on a connecting
portion 63 between the lid 62 and the main body 61, and the
container 61 can be opened and closed freely by pivoting the lid
61. As FIG. 10b shows, in order to cancel the fastening by the
fastener 10, only a force in a direction shown by arrow B or arrow
B' shall be applied to the main body 61 or the lid 62. Also, the
container 60 can be closed again easily and securely.
[0072] Further, by putting a sticker on the matching portion of the
lid 62 and the main body 61, the container 60 can be closed
securely, and it is apparent whether the container 60 has been
opened.
(Paper Binder; See FIGS. 11a, 11b and 11c)
[0073] FIGS. 11a, 11b and 11c show a paper binder 65 with the
fastener 10. The paper binder 65 comprises a hard board foldable at
a center into two parts 66 and 67, and a tab 68 foldable toward the
board 67. The first segment 10A is fitted to the tab 68, and the
segment 10B is fitted to a side portion of the board 66 such that
the segments 10A and 10B will be opposite to each other.
(Bed Sheet; See FIG. 12)
[0074] FIG. 12 shows a bed covered with a bed sheet 70 with the
fasteners 10. A plurality of fasteners 10 are provided such that
the unfastening directions of the fasteners 10 are in a direction
shown by arrow B, and only by pulling the sheet 70 in the direction
shown by arrow B, all the fasteners 10 can be unfastened at
once.
Second Embodiment of Fastener; See FIGS. 13 and 14
[0075] FIG. 13 shows a plastic fastener 100 according to a second
embodiment of the present invention. Two protrusions 102 protrude
from a base 101 side by side. Each of the protrusions 102 has a
stopper hook at its end, and sections of each protrusion 102 in a
direction (see arrow B) are identical. Between the protrusions 102,
a groove 103 is formed, and sections of the groove 103 in a
direction (shown by arrow B) are identical. The fastener 100 can be
produced by extrusion molding described in connection with the
first embodiment out of the same material for the fastener
according to the first embodiment.
[0076] The fastener 100 is composed of a couple of bases 101. The
fastener 100 can be used for the envelopes, the bags and the
container shown by FIGS. 2a and 2b-12.
[0077] When the back sides of the bases 101 are pressed in
directions shown by arrows A and A', the protrusions 102 come into
the corresponding grooves 103, and thus, the upper protrusions 102
and the lower protrusions 102 are engaged with one another. The
width of the protrusions 102 is larger than the width of the space
between the adjacent two protrusions 102, and each protrusion 102
comes into the corresponding groove 103 with its both sides
interfering with the sides of the protrusions 102 protruding from
the opposing base 101. Therefore, once the engagement is settled,
the engagement will not be canceled by a force in a direction
opposite the engaging direction. Also, there are necessarily two
pairs of a protrusion and a groove engaged with each other.
[0078] However, by sliding the upper base 101 and the lower base
101 in directions shown by arrows B or B' relatively to each other,
the engagement of the protrusions 102 can be canceled easily.
[0079] In the fastener 100, for fastening, the outer protrusions a
and b interfere with the inner protrusions c and d, respectively,
and bend outward, which facilitates mutual engagement of the
protrusions. Also, this enables the space between the protrusions a
and d and the space between the protrusions b and c to be designed
smaller, which results in an improvement in the strength of
engagement.
[0080] Also, even if the upper and the lower bases 101 are fitted
out of positions in the directions shown by arrows C and C', the
upper and lower protrusions can be certainly engaged with one
another. More specifically, as FIG. 14 shows, as long as the bases
101 are positioned such that the protrusion d is located within a
range X from a position x where the tip of the protrusion d is
immediately right of the tip of the protrusion c to a position x'
where the tip of the protrusion a' is immediately left of the tip
of the protrusion b, mutual engagement of the upper protrusions and
the lower protrusions is possible.
[0081] Further, each of the bases 101 may have three or more
protrusions 102. In view of flexibility of engagement, however, it
is preferred that each of the bases 101 has two protrusions 102 as
in the second embodiment.
[0082] The fastener 100 can be produced by a-method shown by FIG.
15. Specifically, a wide base 101' with a plurality of protrusions
102 formed thereon is molded, and the wide base 101' is cut into
pieces at a pitch of p such that each piece (fastener 100) has two
protrusions 102. Further, the cut pitch p may be designed
arbitrarily so that fasteners 100, each having an arbitrary number
of protrusions 102, can be manufactured.
(Method of Molding Fasteners; See FIG. 16)
[0083] Next, an exemplary method of producing the wide base 101'
with protrusions 102 formed thereon shown by FIG. 15 is
described.
[0084] As FIG. 16 shows, while a roll of film, which is to be made
into the base 101', is unrolled in a direction f via a receiving
roller 120, melted plastic material, which is to be made into the
protrusions 102, is extruded from an extrusion-molding nozzle 121
onto the receiving roller 120. The extruded protrusions 102, which
are in a melted state, are polymerized with the base 101' at their
bottoms. Then, the base 101' with the protrusions 102 pass through
cooling water (not shown), and thereby, the protrusions 102 are
fixed on the base 101'.
[0085] Needless to say, as well as the method shown by FIG. 16, it
is possible to extrusion mold the base 101' and the protrusions 102
at one time integrally.
(Tie; See FIGS. 17-20)
[0086] Now, a tie 150 with fasteners 100 is described.
[0087] As FIG. 17 shows, the tie 150 is a plastic tape 151 with a
series of five protrusions 102 on each end. As FIG. 18 shows, the
tie 150 is produced by forming a series of five protrusions 102
integrally on each end of base material of the plastic tape 151 and
by cutting the base material with the protrusions 120 formed
thereon into tapes with a specified width at cut lines X. Thus, the
tape 151 of this tie 150 also serves as a base. However, the tape
151 may be made of a material different from the material of the
protrusions 102, for example, rubber, and the bases 101 with the
protrusions 102 may be bonded on the tape 151.
[0088] As FIG. 19 shows, the tie 150 is used, for example, to
bundle a plurality of items 160. By winding the tie 150 around the
items 160 and by engaging the protrusions 120 with each other, the
items 160 can be easily bundled. Also, only by sliding, the
protrusions 102 can be easily disengaged. Providing a plurality of
protrusions 102 is to make a tolerance of engagement. Protrusions
102 may be provided on one surface of the tape 151 from an end
toward the center, and protrusions 102 may be provided on the other
surface of the tape 151 entirely. Also, on both surfaces of the
tape 151, protrusions 102 may be provided entirely.
[0089] Further, as FIG. 20 shows, a plurality of ties 150 may be
connected to each other by engaging each other's protrusions 102 so
as to make a longer tie with a desired length.
Other Embodiments
[0090] Plastic fasteners, envelopes, bags and ties according to the
present invention are not limited to the embodiments above, it is
to be noted that various changes and modifications are possible to
those who are skilled in the art.
[0091] The protrusions and the grooves formed on the bases may have
arbitrary sections. Also, the fasteners according to the present
invention may be used for various things as well as the envelopes,
the bags, etc. shown by FIGS. 2a and 2b-12.
* * * * *