[ Technical Field ]
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The present invention relates to a zipper bag and a slider,
and more particularly to a bag which has, at the open side of the
bag, a zipper composed of a concave portion and a convex portion
which are capable of engaging with each other and a slider for
opening and closing the zipper.
[ Background Art ]
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Conventionally, there have been provided various plastic
zipper bags as shown by Fig. 18. A bag 1 shown by Fig. 18a has,
at the top end of a front film 2 and a back film 3, a zipper 4
composed of a concave portion 4a and a convex portion 4b, and this
type of bag is called top-zipper type. This top zipper is opened
and closed by an opening/closing device (slider) 900 shown in Fig.
18a. A bag 1 shown by Fig. 18b has a zipper 4 composed of a
concave portion 4a and a convex portion 4b which are formed
integrally with the front film 2 and with the back film 3,
respectively, on their inner surfaces in the upper portion. A bag 1
shown by Fig. 18c has a zipper 4 made by fixing a concave portion
4a and a convex portion 4b on the inner surfaces of the front film 2
and the back film 3, respectively, in the upper portion. The bags 1
shown by Figs. 18b, 18c and 18d are of a type which has flaps 2a
and 3a of the films 2 and 3 above the zipper 4, and such a bag 1 is
opened by picking the flaps 2a and 3a by fingers.
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With respect to the bags 1 shown by Figs. 18b, 18c and 18d,
in order to close the zipper 4, the concave and convex portions 4a
and 4b are engaged and pushed from both sides by fingers with the
fingers (see to arrows A) slid along the concave and convex
portions 4a and 4b. In order to open the zipper 4, the flaps 2a and
3a are picked and pulled outward by fingers to disengage the
convex and concave portions 4a and 4b from each other. Such
opening/closing operations are troublesome, and a device which
permits easy open/close of such a bag is demanded.
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Recently, a type of bag 1 whose flaps 2a and 3a are cut along
the alternate long and short dash line shown in Figs. 18b, 18c and
18d has been introduced into market. Cutting the flaps 2a and 3a
enables the bag 1 to be opened and closed by use of the slider 900
shown by Fig. 19a. Here, this type of bag is called pseudo top-zipper
type.
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Fig. 19b shows a case that the opening/closing device
(slider) 900 is fitted to the pseudo top-zipper bag 1. In this case,
when the slider 900 is slid to the end to open the zipper 4, about a
half of the slider 900 sticks out from the end of the bag 1, which is
unstable. The following countermeasures to avoid this problem
have been taken: fitting a stopper at the end of the bag 1; and
forming a projection on the end of the bag 1 by welding the end by
use of a high-frequency welder and using the projection as a
stopper of the slider 900. The fitting of the stopper and the
partial welding have been carried out by hand. This has caused
problems of increasing the number of processes and accordingly of
increasing the cost. Moreover, there is fear that the user may be
harmed by the projection formed to serve as a stopper, and for this
reason, such bags cannot be used as bags for children's clothing
and ladies' clothing. Further, this slider 900 is apt to roll as
indicated by arrow "a" in Fig. 19a, and the movement of the slider
900 is not so smooth.
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Also, the pseudo top-zipper bag shown by Figs. 18b and 18d
still has short flaps 2a' and 3a' although the flaps 2a and 3a have
been cut. There is a problem that the ceiling of the slider 900
rubs against these short flaps 2a' and 3a', thereby making the
short flaps 2a' and 3a' wavy.
[ Disclosure of the Invention ]
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An object of the present invention is to provide a slider
which permits easy open/close of a zipper bag and can be fitted to a
bag which is a finished product easily.
-
Another object of the present invention is to provide a zipper
bag which can be judged apparently to have been opened and
therefore is suited to be used as an envelope for a confidential
letter.
-
Further, another object of the present invention is to
provide a zipper bag which has a slider and has good sealing
performance.
-
Another object of the present invention is to provide a slider
which can be fitted to a pseudo top-zipper bag stably and does not
stick out from an end of the bag even without a stopper when the
slider has opened the zipper.
-
Another object of the present invention is to provide a slider
which does not deform short flaps of a pseudo top-zipper bag.
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In order to attain the objects above, according to the present
invention, a zipper bag which has a zipper composed of a concave
portion and a convex portion which are provided on inner surfaces
of a pair of flaps located in an opening portion of the bag and are
capable of engaging with each other is provided with a slider which
comprises a center leg, a pair of side legs which are located on both
sides of the center leg and are connected to the center leg at their
upper portions and holes which are made among the center leg and
the side legs and the flaps are to come through. This slider is
fitted to the opening portion of the bag in such a way that the
center leg is inserted between the concave portion and the convex
portion of the zipper and that the side legs extend over the flaps
and press the concave portion and the convex portion, and the
slider opens and closes the zipper by sliding along the zipper.
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In this structure, when the slider is slid in a direction, the
center leg comes between the concave portion and the convex
portion of the zipper and separates them from each other.
Thereby, the zipper is opened. When the slider is slid in the
opposite direction, the pair of side legs press the concave portion
and the convex portion of the zipper from both sides to make the
concave portion and the convex portion come into engagement with
each other. Thereby, the zipper is closed. Thus, according to the
present invention, a flap type zipper bag can be opened and closed
easily, merely by sliding a slider.
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Also, the center leg of the slider may have a cutter portion
on a side facing a zipper opening direction. If the flaps of the bag
are fused together or if a seal is provided on the opening of the bag,
when the slider is moved for the first time, the cutter portion cuts
the fused portion of the flaps or the seal. Thus, it can be
apparently judged whether or not such a bag has been opened, and
such a bag is suited to be used as an envelope for a confidential
letter.
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Moreover, it is possible to make the bag as a closing type.
The slider is fitted to bases of the zipper, and the front film and the
back film of the bag are extended upward and fused together above
the slider. In this case, the bases of the zipper are fused to the
front film and the back film only at their lower portions.
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Further, preferably, the center leg of the slider has a
projection at its lower part. This projection is in contact with the
lower surface of the engaged concave and convex portions of the
zipper of a pseudo top-zipper bag. Thereby, the fitting state of the
slider to the zipper becomes stable, and rolling of the slider can be
prevented. Also, when the slider has opened the bag and reached
the end of the bag, the projection comes into contact with the end
of the bag, whereby further movement of the slider can be
prevented. Thus, even without providing a stopper, the trouble
that a half of the slider sticks out from the end of the bag can be
avoided. Consequently, the work to fit a stopper or to form a
stopper portion by use of a welder is no longer necessary.
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Furthermore, it is preferred that the center leg of the slider
has a bulged portion. This bulged portion or the projection is in
contact with the lower surface of the zipper, and thereby, the slider
is prevented from coming off. This slider can be fitted to a bag
which is a finished product by inserting the center leg between the
concave portion and the convex portion of the zipper, and thus, this
type of sliders are suited to be fitted to bags which are mass-produced
by fusion-cutting.
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It is also preferred that projections which protrude from the
ceiling of the slider and face the upper surface of the zipper are
formed on the connecting portion between the center leg and the
side legs. These projections serve as spacers, and the trouble that
the ceiling of the slider rubs against short flaps and makes the
short flaps wavy is prevented. Also, with this arrangement, the
friction between the slider and the flaps becomes small, and the
smoothness of movement of the slider is improved.
[ Brief Description of the Drawings ]
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These and other objects and features of the present
invention will be apparent from the following description with
reference to the accompanying drawings, in which:
- Figs. 1a and 1b show a zipper bag according to the present
invention, Fig. 1a being a perspective view of the bag and Fig. 1b
being an enlarged sectional view of a zipper part of the bag;
- Figs. 2a through 2f show a slider which is a first
embodiment of the present invention, Fig. 2a being a front view of
the slider, Fig. 2b being a side view of the slider viewed from a
zipper closing side, Fig. 2c being a side view of the slider viewed
from a zipper opening side, Fig. 2d being a bottom view of the
slider, Fig. 2e being a front view of a center leg of the slider and
Fig. 2f being a sectional view of a side leg of the slider;
- Figs. 3a and 3b show a state in which the slider is fitted to a
bag, Fig. 3a being a side view of the slider viewed from the zipper
closing side and Fig. 3b being a side view of the slider viewed from
the zipper opening side;
- Fig. 4 is a side view of a slider which is a second
embodiment of the present invention;
- Figs. 5a through 5d show a slider which is a third
embodiment of the present invention, Fig. 5a being a side view of
the slider viewed from a zipper closing side, Fig. 5b being a
sectional view of the slider taken along the line Vb-Vb in Fig. 5a,
Fig. 5c being a front view of a center leg of the slider and Fig. 5d
being a front view of a side leg of the slider;
- Fig. 6 is a perspective view which shows a way of
automatically fitting sliders to zipper bags during producing
zipper bags;
- Figs. 7a and 7b show a zipper bag with temporary fixing
means, Fig. 7a being a perspective view of the bag and Fig. 7b
being an enlarged sectional view of a zipper part of the bag;
- Fig. 8 is a front view of a zipper bag with another temporary
fixing means;
- Figs. 9a through 9c show a slider with a cutter portion, Fig.
9a being a bottom view of the slider, Fig. 9b being a front view of a
center leg of the slider and Fig. 9c being a sectional view of the
center leg taken along the line c- c in Fig. 9b;
- Figs. 10a and 10b show a sealing type zipper bag, Fig. 10a
being a front view of the bag and Fig. 10b being a sectional view of
the bag taken along the line b- b in Fig. 10a;
- Fig. 11 is a front view of a sealing/closing type zipper bag;
- Fig. 12 is a sectional view of a closing type zipper bag;
- Figs. 13a through 13d show another slider according to the
present invention, Fig. 13a being a side view of the slider viewed
from a zipper opening side, Fig. 13b being a side view of the slider
viewed from a zipper closing side, Fig. 13c being a sectional view of
the slider taken along the line XIIIc-XIIIc in Fig. 13a and Fig. 13d
being a sectional view of the slider taken along the line XIIId-XIIId
in Fig. 13a;
- Fig. 14 is a front view of the slider;
- Fig. 15 is a partial sectional view of a center leg of the
slider;
- Fig. 16 is a bottom view of the slider;
- Figs. 17a and 17b show a state in which the slider is fitted
to a zipper bag, Fig. 17a being a side view of the slider viewed from
the zipper opening side and Fig. 17b being a side view viewed from
the zipper closing side;
- Figs. 18a through 18d show zipper bags of prior art, Fig. 18a
showing a top-zipper type, Figs. 18b and 18c showing a flap type
and Fig. 18d showing a pseudo top-zipper type; and
- Figs. 19a and 19b show a zipper bag with a slider of prior art,
Fig. 19a being a perspective view and Fig. 19b being a front view.
-
[ Best Mode for Carrying out the Invention ]
-
Some exemplary sliders for opening and closing zipper bags
are described with reference to the accompanying drawings.
-
Fig. 1 shows a zipper bag 1 to which a slider according to the
present invention is fitted. The bag 1 is a conventional one made
by fusion-cutting or by fusing and cutting.
-
The slider 10A is made integrally by injection of resin. Fig.
2 shows the first embodiment 10A of such a slider, and this slider
has a center leg 11 and a pair of side legs 21. The center leg 11
and the side legs 21 are connected to one another at their upper
sides, and holes 29 in which flaps 2a and 3a of the bag 1 can go
through are formed. The center leg 11 has grooves 12 on both
sides in the middle portion, and a concave portion 4a and a convex
portion 4b of a zipper 4 are capable of coming into the grooves 12
respectively. Further, above and below the grooves 12, the center
leg 11 has bulged portions 13 and 14. Moreover, as shown in Fig.
2e, a cut-out 15 is made on a side facing the zipper opening
direction.
-
The side legs 21 sandwich the center leg 11 from both sides,
and bulged portions 22 are made on the side legs 21 opposite the
cut-out 15 of the center leg 11.
-
The slider 10A of the above-described structure is fitted to
the bag 1 by using its own flexibility in the following way: while
the zipper 4 is opened, the center leg 11 is inserted between the
flaps 2a and 3a; and the bulged portion 14 is made overcome the
concave and the convex portions 4a and 4b (see Figs. 3a and 3b).
As shown in Fig. 3a, the part of the concave portion 4a and the part
of the convex portion 4b which have come into the cut-out 15 at
that time are pressed by the bulged portions 22 and engage with
each other. Also, as shown in Fig. 3b, the part of the concave
portion 4a and the part of the convex portion 4b which have come
into the grooves 12 are separated by the center leg 11 and stay in
the spaces among the center leg 11 and the side legs 21. The flaps
2a and 3a are in the holes 29.
-
The slider 10A which have been fitted to the bag 1 in this
way does not come off upward because the concave and convex
portions 4a and 4b are in the grooves 12 and the cut-out 15 and are
sandwiched by the side legs 21 from both sides. It is possible to
detach the slider 10A from the bag 1 by pulling the side legs 21
outward. However, as long as such deformation is not made,
merely pulling the slider 10A upward does not cause the slider 10A
to come off.
-
Next, the opening/closing operations by use of the slider 10A
are described.
-
When the slider 10A is slid in a direction in which the side of
the grooves 12 leads (see Fig. 2e), the concave portion 4a and the
convex portion 4b come into the cut-out 15 and engage with each
other. Thereby, the zipper 4 is closed. When the slider 10A is
slid in the opposite direction, the concave portion 4a and the
convex portion 4b are separated from each other by the center leg
11, and more particularly by a partition wall 12a of the grooves 12
(see Fig. 2e). Thereby, the zipper 4 is opened.
-
Further, in order to make more excellent performance, the
slider 10A adopts the following construction.
-
On the outer surface of one of the side legs 21, a slightly
recessed triangle mark 23 is given (see Fig. 2a). This mark 23
indicates that a slide of the slider 10A in the direction shown by
the vertex of the triangle results in closing the zipper 4. Such a
mark may be provided on the slider 10A by printing or the like.
-
The center leg 11 and the side legs 21 are tapered, and all
the corners are rounded off. These arrangements are for easy
fitting to the bag 1 and for smooth sliding. For the same purpose,
the bulged portion 14 is tapered downward.
-
At least one of the bulged portions 13 and 14 which are
located above and below the grooves 12 may be formed on the inner
surfaces of the side legs 21, not on the center leg 11. Fig. 4 shows
the second embodiment 10B in which bulged portions 13' are
provided on the inner surfaces of the side legs 21 instead of the
bulged portion 13 of the center leg 11.
-
Fig. 5 shows the third embodiment 10C. The structure is
basically the same as those of the first and second embodiments.
The same members and parts are provided with the same reference
symbols as used in the first and second embodiments.
-
This slider 10C has neither the bulged portions 13, 14, 22
nor the grooves 12 of the first embodiment. The center leg 11 of
the slider 10C has a separating portion 12a which separates the
concave portion 4a and the convex portion 4b of the zipper 4 from
each other and a cut-out 15 extending from the separating portion
12a to the zipper opening side of the slider 10C. Each of the side
legs 21 of the slider 10C has a pressing portion 24 opposite the
cut-out 15 and a relieving portion (cut-out) 25 opposite the
separating portion 12a.
-
The concave portion 4a and the convex portion 4b which
have come into the cut-out 15 are pressed by the pressing portions
24 and engage with each other. Also, the concave portion 4a and
the convex portion 4b are separated from each other by the
separating portion 12a of the center leg 11. The relieving
portions 25 are to push the separated concave and convex portions
4a and 4b backward smoothly. The relieving portions 25 are not
necessarily cut-outs but may be recesses.
-
The above-described three kinds of sliders 10A, 10B and 10C
are designed in the premise that they are fitted to bags which are
finished products. However, the sliders 10A and 10B of the first
and second embodiments can be automatically fitted to bags under
production and can be introduced into market as bags with a
slider.
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Fig. 6 is a schematic view of a process of automatically
fitting sliders 10A to bags under production. Sliders 10A are
stored one upon another in a vertical hopper 30, and when a rod 31
is moved forward in a direction of arrow "C", the slider 10A on the
bottom is pushed out of the hopper 30. Bags are produced by a
conventional method (for example, by fusing). In the processes
before, a wide film 1' was folded in two, and a zipper 4 is fused.
Then, the two-folded film 1' is transported to the hopper 30 (fitting
station X1). At the station X1, the zipper 4 is opened by a
separator 32, and a slider 10A is fitted. In the next process, a bag
1 is cut off from the film 1' at a fusion-cutting station X2. At the
pitch of cutting, the rod 31 is moved to fit sliders 10A to zippers 4.
-
Next, temporary fixation of the slider 10A at the closing
position is described.
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The slider 10A is capable of sliding easily so as to open and
close the zipper 4. However, if the slider 10A slides from the
closing position too easily, the bag 1 will be opened unnecessarily.
In order to avoid such trouble, as shown in Fig. 7, the front and
back films of the bag 1 are fused together at a place 5 in the
opening portion 7 right under the zipper 4.
-
As shown in Fig. 7a, three sides (shadowed portions) of the
bag 1 are fused, and further, the portion 5 is fused. When the
slider 10A completely closes the zipper 4, the lower part of the
center leg 11 of the slider 10A is in contact with the fused portion 5
and is pressed by the fused portion 5. This pressure works as
resistance to a slide of the slider 10A in the direction to open the
bag 1, and thus, the slider 10A is temporarily fixed in the closing
position. This fixing force is not so strong, and when the sldier
10A is picked by fingers and is slid in the direction to open the bag
1, the center leg 11 separates from the fused portion 5.
-
Various ways of providing resistance to a slide of the slider
10A are possible as well as the fused portion 5. For example, as
shown in Fig. 8, the front and back films of the bag 1 may be fused
together in a spot 6.
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As shown in Fig. 9, it is possible to provide a
cutter portion
16 to the slider. Fig. 9a corresponds to Fig. 2d, and Fig. 9b
corresponds to Fig. 2e. Fig. 9c is a view obtained by cutting the
slider along the line
c-
c in Fig. 9b. The
slider 10A' shown in
Fig. 9 is slightly different from the
slider 10A shown in Fig. 2 in
shape. However, the
slider 10A' is basically the same as the
slider 10A except having a
cutter portion 16.
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This slider 10A' is used in embodiments shown by Figs. 10
and 11. The bag 1 shown by Fig. 10 has a seal 8 between the flaps
2a and 3a. When the slider 10A' is slid to the right in Fig. 10a to
open the zipper 4, the cutter portion 16 cuts the center portion of
the seal 8 (the portion indicated with arrow "C" in Fig. 10b).
Because the cutter portion 16 of the slider 10A' is sandwiched
between the side legs 21, the cutter portion 16 never harms the
user and is safe.
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Since the bag 1 shown by Fig. 10 is apparently judged
whether or not it has been opened, it is suited to be used as an
envelope of a confidential letter. Further, the lower side 1a of the
bag 1 is opened so that a letter or the like can be put into the bag 1,
and after putting things into the bag 1, the lower side 1a is closed,
for example, by fusing. The seal 8 may be a cellophane adhesive
tape.
-
Fig. 11 shows an embodiment of a closing type bag 1 with a
seal 9.
-
In this embodiment, two sheets of sealing material are laid
on the outer surfaces of the flaps 2a and 3a, respectively, and the
two sheets are fused together on the whole peripheral sides as
shown by the shadowed portions. The two sealing sheets are
fused together at the sides 9b and 9c and fused with the front and
back films of the bag 1 at the sides 9a, 9d and 9e. A cut is formed
at a portion indicated with arrow "D", and when the bag 1 is
opened, first, the side 9b is taken off by use of the cut. Thereby,
the slider 10A' appears. Next, when the slider 10A' is slid in a
direction to open the Zipper 4, the cutter 16 cuts the side 9c of the
seal 9. Thus, the bag 1 shown by Fig. 11 has a closing function as
well as a sealing function.
-
Further, the zipper bags shown by Figs. 10 and 11 can be
modified in various ways.
-
For example, with respect to the bag 1 shown by Fig. 10,
instead of providing a seal 8 or a cellophane adhesive tape, the
flaps 2a and 3a may be fused together so that the cutter portion 16
will cut the fused portion when opening the bag 1. With respect
to the bag 1 shown by Fig. 11, if the flaps 2a and 3a are fused
together, the seal 9 may be provided to cover only the slider 10A'.
Further, such a bag may be provided with a fused portion 5 or 6 for
temporarily fixing the slider 10A' in the closing position.
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Next, another embodiment of a closing type zipper bag 100
is described. As shown in Fig. 12, the bases 4c of the zipper 4 is
fused to the front film 2 and the back film 3 of the bag 1 only at
their lower parts Y1, and the slider 10A is fitted to the bases 4c of
the zipper 4. The front film 2 and the back film 3 of the bag 1
extend upward covering the slider 10A and form an opening side 7.
-
After things are put into the bag 1, the zipper 4 is closed by
use of the slider 10A, and the upper parts Y2 of the front film 2 and
the back film 3 are fused together from one end to the other end.
Thus, the front and back films of the bag cover the slider 10A and
are fused together at their upper portions Y2. With this
arrangement, although the slider 10A is fitted, the bag 1 can be
sealed firmly, and the bag 1 is suited to be stored with food. In
order to open the bag 1, the user cuts off the upper portion Y2 with
scissors. Preferably, if half-cut processing or the like is carried
out so that the films 2 and 3 can be cut in a direction right above
the fused portion Y1, the bag can be opened by hand easily. Once
the bag 1 is opened in this way, the bag 1 can be used as a zipper
bag with a slider in the above-described way.
-
Further, it is possible to fuse the upper portion Y2
beforehand. In this case, the lower side (not shown in Fig. 12) of
the bag 1 is not fused and stays open. After things are put into
the bag 1 through the open lower side, the lower side is sealed.
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Fig. 13 shows another embodiment of a slider according to
the present invention. This slider 310 is made integrally by
injection of resin. The slider 310 is composed of a center leg 311
and a pair of side legs 321, and these legs 311 and 321 are
connected to one another at their upper parts.
-
The slider 310 is used for a zipper bag which is of a pseudo
top-zipper type 1 shown by Fig. 18d. This zipper bag has a zipper
4 composed of a concave portion 4a and convex portion 4b at the
upper opening, on the inner surfaces of the front film 2 and the
back film 3.
-
The structure of the slider 310 is described in detail. The
center leg 311 has a separation wall 312 which separates the
concave portion 4a and the convex portion 4b of the zipper 4 from
each other, a cut-out 313 wherein the concave portion 4a and the
convex portion 4b come into engagement with each other and a
bulged portion 314 which is made under the separation wall 312
(see to Fig. 15). Each of the side legs 321 has a recessed portion
322 opposite the separation wall 312 and a pressing portion 323
opposite the cut-out 313. Further, the center leg 311 has a
projection 315 which protrudes from the bulged portion 314 and
extends under the cut-out 313.
-
The slider 310 of the above-described structure is fitted to
the bag 1 by use of its own flexibility in the following way: while
the bag 1 is opened, the center leg 311 is inserted between the
concave portion 4a and the convex portion 4b of the zipper 4; and
the side legs 312 are placed outside the front film 2 and the back
film 3 (see Fig. 17). At this time, as shown in Fig. 17a, part of the
concave portion 4a and part of the convex portion 4b are separated
from each other by the separation wall 312. Also, as shown in Fig.
17b, part of the concave portion 4a and part of the convex portion
4b which have come into the cut-out 313 at this time are pressed
inward by the pressing portions 323 and come into engagement
with each other. The bulged portion 314 and the projection 315
are located under the zipper 4.
-
Once this slider 310 is fitted to the bag 1 in this way, the
slider 310 will never come off because the bulged portion 314 and
the projection 315 are in contact with the lower surface of the
zipper 4. Also, rolling indicated with arrow "a" in Fig. 19a will
never occur.
-
Now, the opening/closing operations of the zipper 4 by use of
the slider 310 are described.
-
When the slider 310 is slid in the "closing" direction shown
in Figs. 13d and 15, the concave portion 4a and the convex portion
4b are pressed into the cut-out 313 by the pressing portions 323
and come into engagement with each other. Thereby, the zipper 4
is closed (see Fig. 17b). When the slider 310 is slid in the opposite
direction ("opening" direction shown in Figs. 13d and 15), the
concave portion 4a and the convex portion 4b are separated from
each other by the separation wall 312. Thereby, the zipper 4 is
opened (see Fig. 17a). When the zipper 4 is opened in this way,
the slider 310 is positioned at a corner of the bag 1; however,
because the projection 315 of the center leg 311 is in contact with
the end of the bag 1, trouble as shown by Fig. 19b that the slider
900 sticks out from the end of the bag 1 will never occur.
-
Further, the slider 310 has projections 316 and 317 on the
ceiling connecting the center leg 311 and the side legs 312 to one
another. The projections 316 and 317 face the upper surface of
the zipper 4 (see Fig. 17) and serve as spacers which prevent the
upper portions 2a' and 3a' of the front and back films 2 and 3 of the
bag 1 from coming into contact with the ceiling of the slider 310.
With this arrangement, it is avoided that the upper portions 2a'
and 3a' will become wavy.
-
Further, the slider 310 can be fitted to a bag 1 as a finished
product easily by inserting the center leg 311 between the concave
portion 4a and the convex portion 4b of the zipper 4. This means
that sliders 310 can be fitted to bags mass-produced by fusion-cutting,
and there is wide usage of the slider 310. Once the slider
310 is fitted to a bag, the slider 310 will never come off because the
bulged portion 314 and the projection 315 are in contact with the
lower surface of the zipper 4.
-
Zipper bags and sliders according to the present invention
are not limited to the above-described embodiments.
-
With respect to the sliders, the open angle of the side legs,
the shapes of the grooves and the bulged portions may be changed
in any way as long as the objects of the present invention can be
attained. Also, the bags may be of a large type such as handbags.
-
Further, the sliders are not necessarily of an integral
construction. It is possible to assemble a slider from some parts
(a center leg and side legs) when the slider is fitted to a bag.
-
Although the present invention has been described in
connection with the preferred embodiments above, it is to be noted
that various changes and modifications are possible to those who
are skilled in the art. Such changes and modifications are to be
understood as being within the scope of the present invention.