Note: Descriptions are shown in the official language in which they were submitted.
hA~GROLJ~ F ~E Il~v~ r
~elated Ap~lication
This is a divisional appliCatiOn of the
co-pending Canadian Patent A~plication Serial l~o. 443,22~,
filed ~ecember 18, 1983.
Field of t~Le Invention
The present invention relates to a method of
manufacturing a water-resistant slide fastener suitable
for ski wears, sports bags, camping tents, etc. whicA
require good resistance against rain and snow.
Prior Art
A known water-resistant slide rastener stringer,
as disclosed in Japanese ~atent ~ublication NO. 4b-17~7b,
comprises a su~port tape and a row of coiled coupling
elements mounted on one surface of the support tape; tne
su~ort tape and tne coupling element row are covered ~y a
layer of water-resistant elastomeric material. ~ucn prior
slide fastener is not suita~le for sports bays, for
example, because confron~ing contact edges o~ tne oppose~
support tapes ten~L to be easily disenga~ed from one
another wh0n thrusting force is exerted on tne sup~ort
tapes from the interior o~ the bag due to over-packiny,
causing inadequate water-tightness.
U.S. Patent l~o. ~,~41,~L51 discloses a
wat~r-resistant slide fastener which comprises a pair of
opposed sealing members o~ water-resistant elastomeric
material, a pair of opposed upper strin~ers attached to
the sealing meMbers on respective upper surfaces thereof,
and a pair of opposed lower stringers attached to tne
sealing members on respective lower surraces thereof.
Although it guarantees ade~uate water-tightness, tne prior
slide fastener has a very complex structure and therefore
is not suita~le for ski wears, sports bags, campirLg tents
35 Which must ~e n,inlmized in weight. ~`urther, such comple~
slide fastener cannot be produced at low cost.
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U.S. ~atent L~O. 4,211,15~ discloses a met~od of
manufacturiny a continuous water-resistant slide fastener
stringerO The prior method, however, comprises
complicated and hence la~orious ~rocessin~ steps which
must be ~erformed meticulously witn a large scale and
cornplex apparatus. ~ith this rnethod, it is difficult to
coat water-resistant material over botn the support tape
and the coupLing elements evenly. qherefore, satis~actory
and uni~orm quality water-resistant sliae fasteners cannot
be produced.
~Ui~lv~ O~' T~ V~TIO~
It is therefore an ob~ect of tne invention to
provide a water-resistant slide ~astener suitable ~or
particularly ski wears, s~orts bags, cam~ing tents, etc.
which require yoOa resistance a~ainst rain and snow.
Anotner ob~ect o~ trle invention is to ~rovi~e a
durable water-resi~tant slide fastener wnicn is simple in
constructivn and hence inexpensive.
Still another object of the invention is to
provide a water-resistant slide fastener WlliCh mailltain
adequate water-tightness between confrontin~ contact edyes
of opposed support tapes even when tnrusting force is
exerted on the tapes in eitner ~acewise direction.
A furtner object oi the invention is to a method
of manufacturiny such water-resistant stringer easily and
inexpensively without using any large scale and complex
apparatus.
A still further object of tne invention is to
provide a guide for su~portiny a continuous
water-resistant strip and a pair 01 rows o~ coup1iny
elernents while the latter iq sewn to the stri~ on a sewiny
machine.
In yeneral tèrms, the invention ~rovides a metnod
of manufacturing a water-resistant slide fastener stringer
including a support tape sup~orting ~n op~osite surfaces a
3~2'~
4 _
pair of rows of coupling elements, co~prising the steps of:
(a) providing a continuous water-resistant stri~;
(b) attaching a pair of rows of coupling ele~ents to
one surface of the water resistant strip in such a
position that the pair of coupling element rows are
dis~osed along a lonyitudinal center line of the
water~resistant strip, one at each side thereof;
(c) then folding the water-resistant strip over
itself, about said longitudinal center line, into a ~air
of super~osed strlp nalves to provide the support tape; an~
(d) finally, ~oininy confrontiny inner surfaces o~
the su~erposed ~trip ~lalves togetner.
Many o~her o~jects, features and additional
advantages o~ the ~resent invention will ~ecome ~lanifest
: 15 to those versed in tne art u~on ~aKing reference to tne
detailed description an~ the accompanying sheets of
drawings in which preferred structural embodiments
incorporating tne principles of the present invention are
shown by way of illustrative exam~le.
~RI~F D~:SCRI~rIOl~ OF Th~ ~RAWl-~GS
~:; Fl~. 1 is a fragmentary plan vie~ of a
water-resistant slide fastener embodying t~e present
invention;
FIG. 2 is a transverse cross-sectional view taken
along line II-II of ~IG. 1, showing onl~ one
water-resistant fastener stringer;
i'~G~. ~ t~rough 11 are transverse cross-sectional
vi~ws showing various Illodifications o~ the water-resistant
fastener strinyer of ~I~. 2, each of ~'IG~. b an~ li
illustrating the same having been interengaged witn a li~e
com~anion stringer;
FIG. 1~ illustrates tne water-resistant stringer
of ~IG. 5 as having been interengag~d witn a like
companion stringer;
. ,~
~L29~
,
FIG. 13 is a fragmentary transverse
cross-sectional vie~ of a guide for su~orting a
continuous water-resistant strip and a pair of rows o~
coupliny elements while the latter is sewn to the strip on
a sewing r,lacnine (only sewing needles and loo~ers of tne
machine are shown);
~ 'IGS. 14 tnrou~h 16 illustrate a method of
manufacturing t~le water-resistant fastener stringe~ of
each of FI~. 5 11, usiny the guide of ~ . 13;
l~ YlG. 17 is a fragmentary transverse
cross-seetional view o~ a modified yuide;
h'I~ lustrates anotner method of
manufacturing tne water-resistant ~astener stringer o~
each of ~IG~ 11, using the modified guide of ~I~. 17;
FlG. 19 illustrates the manner in wnich a
water-resistant strip with a pair of couplirlg elemerlt rows
attached thereto is ~olded on i-tself to ~rovide the
water-resistant stringer of FIG. 12;
E'I~. 20 is a fragmentary plan view, partly in
cross-section, of a modified water-resistant slide
fastener;
FIG. ~ an enlarged transverse cross-sectional
view taken along line XXl-XXI of r'lG. ~0, showin~ only one
water-resistant fastener stringer;
FIGS. ~ throuyh 26 are transverse
cross-sectional views showin~ various ~iodifications of tne
water-resistant fastener strin~er of FIG. ~l, onl~ FlG. 2
illustratin~ the same havin~ been interenyaged with a
com~anion strinyer;
FIG. 27 illustrates the w~ter-resistant fastener
strin~er of FI~. 2~ as haviny been interenyayed witn a
li~e companion strinyer;
FI~ 28 iilustrates the water-resistant fastener
stringer of FIG. 25 as having been interengacjed with a
like companion stringer; and
.
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-- 6
~ 9 illustrates tne manner in whicn a
water-resistant strip with a ~air of coupling element rows
attached tnereto is folaed on itself to provide the
water~re~is~ant fastener st~inger of k'lv. 2~.
DhTAI~h~ ~rs~krpTIvl~
_
~ . 1 shows a water resistant slide fastener 1
com~risiny a pair of slide fastener strinyers 2, ~'
(nereinafter referre~ to dS "~ater-resistant strin~ers").
~s shown in k'Iv. ~, each water-resistant stringer ~
includes a water-resistant support tape 3 and a ~air of
upper and lower rows of coupling elements 4, 5 mounted on
opposite surfaces of tne support tape 3 along a
longitudinal marginal portion ~a tnereo~, ~he upper and
lower coupling element rows 4, 5 ~ein~ enga~-eable witn a
pair o~ corresponding coupling element rows 4', 5',
respectively, of a like companion stringer ~' across an
imayinary center line M of mutual engagementO The
marginal yortion ~a of each water-resistant support tape
has a contact edge ~b' that is enga~eable with a
corresponding contact edge 3b' of the companion strin~er's
support tape 3' to effect a water-tiyhtness between such
two stringers 2, ~'. 1'he contact ed~e 3b in its free fOLIII
projects beyond tne center line ~1 vy a predetermined
distance ~.
~ach row o~ coupliny elements 4, ~ COmpLiSeS a
continuous coiled filament of syntnetic resin dttacned to
the suppor~ tape ~ by sewn stitches 6 of "dou~le ïocked
stitch" passing througn a pair of reinforcement cores
~ and the support tape 3, each reinforcement core 1
extending lon~itudinally throu~n tne successive coiled
coupling elements o~ a respective row 4~ 5.
The support taEe 3 comprise~ a continuous core
web or strip 11 of cloth covered on its whole surface by a
layer 13 of water-resistant material such as natural or
synt~letic rubber or otner elastomeric synthetic resin.
.
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.. ~ '' ,
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~2~
-- 7 --
~ . 3 snows a water~resis~ant stringer ~
according to a secon~ em~odiment in WhiCh the sup~or~ tape
3 comprises a pair ot super~ose~ strips 11, 11 of cloth,
each strip ~eing covered on its whole surface ~cept one
or inner surface by the water-resistant layer 1~. ln
production, each cou~liny element row 4, 5 is mounted on
the outer or coverea surface of a respective one of up~er
and lower stri~s 11, ll ~y sewn stitches 6. 'l'r,er~ a film
14 of thermoplastic s~lthetic resin is sandwicned between
the two stri~s 11, ll an~ is attached at opposite faces tO
the inner or non-covered surfaces of tne two strips 11, 11
in a well known manner such as by applyin~ neat and,
pressure. Alternatively, tne inner confrontin~ surfaces
of the two strips 11, ll may be bonded to one another by
an adhesive.
FIG, 4 snows a tnird embo~iment in which the
support tape 3 comprises a single strip of water-resiqtant
material such as natural or synthetic rubber or other
elastomeric syntnetic resin.
~ ~'IG. 5 shows a fourth embodiment ill which the
support tape ~ comprises a continuous core web or strip 11
of cloth folded on itself into a pair o~ superposed strip
halves lla, llb and covered on tne whole surface, exce~t
inner surface, of edch strip half lla, llb b~ the
water-resistant layer 13. ~ach row of couælin~ elements
4, 5 is mounted on tne outer or covered surface of tne
res~ective strip halr lla, llb by sewn stitches 6. A ~ilm
14 of thermoplastic synthetic resin is sanawiched between
the two strip halves lla, llb and is attacned at op~osite
surfaces to tne inner or non-covered surfaces of the two
strip halves lla, llb in a well known manner SUC~I as by
applying heat and pressure. Alternatively, the inner
confronting surfaces of the two strip halves lla, llb may
be bonded to ona another by an adhesive. FIG. 12
illustrates the water-resistant stringer 2 of ~'lG. 5 as
; interenyaged with a like companion stringer 2'.
:
3~
~ I~. 6 shows a pair of water-resistant strin~ers
2, 2' accordiny to a fi~tn em~odiment in which the su~port
tape ~ of each stringer com~rises a core weD or strip 11
of cloth folded Oll itself into ~ pair of superposed stri~
halves lla, llb and covered on the wnole sur~ace, except
inner surface, of eacn strip half lla, llb ~y a layer 13
of water-resistant elastomeric material preterably
comprising soft polyvinyl cnloride. ~he inner confrontiny
surfaces of the two strip halves lla, l1~ may De bonded to
one another by an adhesive. 1he support tape ~ has a
projection ~c made of hard polyvinyl chloride and formed
integ~ally with tne 1ayer 1~ of soft polyvinyl chloride ~y
extrusion-molding. When the opposed stringers 2, 2' are
interengaged, the projection 3c of one support tape 3
penetrates into the contact edge 3b' of tne otller support
tape 3', causing an improved water-tightness between the
opposed support tapes ~
E'I~. 7 snows a sixth em~odiment in which the
support tape 3 comprises a strip ll of warp-knit fa~ric
folded on itself into a pair of superposed strip halves
l1a, llb and covered on outer surface of eacn strip na1f
l1a, li~ by the water-resistant layer l~, the knit fabric
being composea of tricot stitcnes forminc~ on tne inner or
non-covered surface o~ each strip half lla, ll~ a
plurality of longitudina1 wales lS and interwale grooves
16. The sewn stitches 6 extend throuyh a transver~e
recess 17 in t~e upper leg ~ of the individual coupling
element 4, ~ and through the warp-knit fabric strip half
lla, l1b at interwale grooves l~, causing firm attachment
3~ of the coupling element rows 4, 5. A fillll 14 o~
thermoplastic synthetic resin is sandwiched between tne
t~o strip halves lla, 1lb and is attached at opposite
surfaces -to the inner or waled surfaces of the two strip
halves lla, llb by applyin~ neat and pressure.
,~ ,
~ 'IG. ~ snows a seventh el~odiment, the support
tape ~ comprises a core weD or strip 11 o~ clotn covered
by a layer 13 of water-resistant elastomeric material, and
a ~l~rality o~ longitudinal reinforciny tnreads 1
embedded in the water-resistant layer i3.
ln an ei4htn embodiment shown in ~IG. ~, the
support tape 3 comprises a core web or strip 11 o~ clotn
covered by a layer 13 of water-resistant elastomeric
material, and a single lon~itudinal reinforcing thread lh
embedded in the water-resistant layer 13 alony tha contact
edge ~b.
FI~. 10 shows a ninth embo~iment in which the
support tape 3 comprises a core weD or strip 11 of cloth
covered by a layer 13 of water-resistant elastomeric
material. Tne sewn stitches ~ attaching the upper row OL
coupling elements 4 penetrate through the upper layer halr
at 1~, while tile sewn stitches 6 attacning tne lower row
of couplin~ elements ~ ~enetrate throug~l tne lower layer
half at 2~, tne position 19 being out of ali~nment with
2~ tne position ~0 in a facewise ~irection of tne support
tape 3 so as not to allow the penetration of water throu~n
tre support tape 3 along the needle threads of the upper
and lower sewn stitcnes 6 due to capillarity.
. 11 shows a tenth embodi~ent in wnicn the
upper row of coupliny elements 4 is out o~ alignment with
the lower row or couplin~ elements 5 in a facewise
direction of the support tape 3 and in whicn the support
tape 3 has an inclined contact edge 3b complementar~ in
sha~e to a corresponding contact edge 3b' of the companion
su~port tape 3'. With this arrangement, the contact edges
3b, 3b' of the opposed support tapes ~, 3' are enyageaDle
with one another with an improved water~tightness.
l'he water-resistant stringer ~ o~ eacn of FI~
- 10 may be ~ro~uced in tne followiny manner, uslng a
guide ~1 (FIG. 13) ~or supporting a continuous
water-resistant strip j and a pair o~ rows of continuous
coiled couplin~ elements 4, 5 while the latter is sewn to
the water-resistant strip on a sewing ~achine (onl~ sewiny
needles 21 and loopers 2~ of the machine are illustrated
for clarity)~
The guide ~1 comprises an elonyate horizontal
lower plate ~3 for supporting on its u~per surface the
water-resistant strip ~, and an upper plate 2~ coextensive
with and parallel to the lower plate 23, tne upper and
lower plate 24, ~ jointly defining therebetween a
longitudinal guide passa~e for the water-resistant stri~
3. The lower plate ~3 has in its upper surface a ~air o~
longitudinally extending parallel guide ~rooves ~ 6 ~or
receiving a ~2ir of rows of coupling elements 4, ~,
respectively, tne two ~uide grooves 25, ~ ~eing separated
'by a partition ~3'. Designated at 1~ is a center line of
tne guide ~1. Tne lower plate 2-~ also has a pair of
laterally spaced lower apertures 2~, 30 oyening into tne
guide ~rooves ~5, 2~, res~ectively, for tne passa~e o~ tne
: 20 respective sewiny needles 21. ~''he upper plate ~4 has a
pair of laterally spaced upper apertures h7, ~ verticall~
aligned with tne lower apertures ~, 3~, respectiveiy, in
the lower plate ~3 for the passa~e of the respective
sewing needles 21. T'he two needles 21, 21 are spaced
apart from one another ~y a predetermined distance æ.
In FIG. 14, a pair of disengaged rows of coiled
coupling elements 4, S is threaded throu~h the pair of
guide grooves ~5, ~6, respectively, in the lower plate ~3
in suc-h a position tnat tne coupling heads 7 of one
couplin~ element row 4 are dispose~ opposite to those OI
tne other coupling element row 5 witn a predetermined
space therebetween~ A continuous water-resistant stri~
i5 placed between the upper and lower plates 23, ~4 in
such a position that tne water-resistant surface of tne
strip 3 faces downwardly~ 1hen tne pair of rows of
, ~-
~2~
coupling elements 4, 5 is sewn to tne water-resi~tant
surface of tne stri~ 3 on a sewing machine as shown in
~lG. 15, durin~ wnicn time tne sewin4 needles ~ 1 (each
carrying a needle thread) are moved toward and away Lrom
tne corresponding loopers 22, 2~ (eacn carrying a looper
tnread~ through tne upper and lower apertures 27, 2~; 2~,
30 to form sewn stitches b, such as double locked
stitches, with the needle and looper t~reads. I'nus t~le
needle thread of each sewn stitches & extend throu~n the
strip ~ and tnen tnrouyh the space between adjacent
coupling elements o~ a res~ective row 4, ~, and are
interloo~ed with tne looper thread wnicn extends over the
upper legs ~ of tne successive coupling elements of the
respective row 4, ~. ~ith tne pair of coupling element
rows 4, 5 mounted on its lower or water-resistant sur~ace,
the strip 3 is ~olded on ltself into a pair of superposed
~trip nalves alony a longitudinal center line ~ (~IG.
to form a longitudinal contact edge 3b centrally between
the two coupliny element rows 4, ~. ~inally, the oppose~
strip Aalves are joined together at their confronting
element-free surfaces by ap~lyin~ neat and pressure, witn
a film 14 of thermoplastic synthetic resin san~wiched
between the two strip halves. Alternatively, the
confrontin~ surfaces o~ tne two strip halves may De ~on~ed
to one anotner by an adhesi~e. >
'Ihus the water-resistant stringer ~ of eac}l of
FIGS. 5 - 10 can be produced with an improved rate of
production, in part because the water-resistant sup~ort
tape 3 per se can be provided easily and inexpensively
without any large scale and complex apparatus and in ~art
because the attaching of the coupliny element rows ~, ~
can ~e performed on a conventional orainar~ sewin~ machine
with tne use of tne yuide ~1 wnich is very si~llple in
construction and hence inexpensive. lnis method also
gua~antees niyn and uniform ~uality strin~ers ~or
water~resistant slide fasteners.
~.~
3~7
- 12 -
Usiny a guide ~2 shown in Fl~. 17 and 1~, the
water-resistant stringer 2 o~ each of ~IG~. 5 - 1~ may
also ~e produced in an alternative method described as
follows.
The guide ~ comprises an elongate norizontal
lower plate ~3' for supporting on its upper surface tne
water~resistant strip 3, and an upper plate ~4'
coextensive with and parallel to the lower pl.ate 23', tne
upper ancl lower plates ~4 ', 2~' jointly defininy
1~ therebetween a longitudinal guide passage for the
water-resistant strip 3 Tne lower plate ~' has in its
upper surface a first longitudinal guide ~roove ~' for
receivin~ a ~air o~ interen~aged rows of couplln~ elements
4, ~. Tne lower plate 2.~' also has a pair of laterall~
spaced lower apertures 2~', 30' o~enin~ into the first
guide ~roove ~ or tne passa~e o~ tne resyective sewiny
needles ~1, 21. 'rhe two needles ~1, 21 are spaced apart
from one another by a predetermining distance ~'. Tne
~upper plate 24' has a pair of laterally spaced upper
20 apertures 27', 2~' vertically aligned with tne lower
apertures 29', ~0', respectively, in the lower plate 23'
for the passag~ of the respective sewin~ naedles ~1, ~1.
The upper plate ~4' also has a downwardly facing second
longitudinal guide groove 31 disposed between tne up~er
apertures ~7', 28' and in concronting relation to the
first ~uide groove 25' of tne lower plate ~3'. A liner 32
extends longitudinally through the second ~uide groove
of the upper plate 24' so as to define therewith a
lonyitudinal of inverted U-snaped cross section.
In F~ , a pair of interengayed rows of coiled
couplin~ elements 4. 5 is threa~ed tnrou~l the first yuide
yroove ~S' in tne lower plate 2~'. ~ continuous
water-resistant strip 3 is placed ~etween the upper and
lower plates 24', ~3' in sucn a position tnat the
water-resiatant surface of the strip 3 faces ~ownwardl~,
' ~
1249~
- 13 -
with a longitudinaily extendin~ central portion 3d of tne
strip 3 t'nreaded tnrough tne cnannel defined in the second
guide groove 31. Thus the central portion ~d of the strip
3 is received in the second guide yroove 31 in a curved
5 form to constitute a slack portion bul~iny from tne stri~
3 in an opposite direction to the coupling element rows 4,
S.
Tnen the pair o~ interengaged rows of cou~lin~
elements 4, S i5 sewn to the water-resistant surface of
the strip ~ at opposite sides of tne slac~ central ~ortion
~d in the manner descri~ed above in connection witn ~
14 and 15~ 'rhe o~posed couplin~ element rows 4, 3 are
disenga~ed and, at the same time, tAe slack portion ~d o~
the strip 3 is tautened. '~nus a semi-product of ~I~. lg
~nas been provided.
With tne opposed coupling element rows 4~ ~
mounted on tne water-resistant surface of tne strip ~ witr-
a predetermined space bet~een the two coupliny element
rows 4, 5, the strip 3 is folded on itseli into a pair of
superposed strip halves along the longitudinal center line
L (FIG. 19) to form a longitudinal contact edge 3b
centrally between the op~osed coupling element rows 4, 5.
Finally, the opposed strip halves are joined toyetner at
their confronting element-free surfaces in the manner
described above.
'rO produce tne water-resistant strin~er of ~IG.
11, tne strip 3 of the semi-product shown in Fl~ is
folded on itself along a longitudinal oIf-center line ~ so
as to ~orm a longitudinal inclined contact ed~e 3D ~etween
the opposed coupling element rows 4, 5.
FIG. 20 shows a pair o~ water-resistant strin~ers
102, 10~' accordlng to an eleventh embodiment, eacn
stringer haviny a pair of rows of discontinuous couplirlg
scoops 104, 105 (made ot metal or syntnetic resin) mounted
on opposite surfaces o~ a water-resistant support tape
a~4~
- 14 -
10~. ~s shown in FI~. ~1, the support tape 103 comprises
a stri~ of water-resistant material such as natural or
syntnetic rubber or other elastomeric syntnetic resin.
Tne water-resistant strip lu3 has on opposite $urfaces a
pair of longitudinal lugs lUU, 1~ extendin4 along a
mar~inal portion lO~a of the strip 1~ ~ach row of
coupling scoops 104, 1~5 is secured to a respective one of
the lugs 100 at uni~or~ distances therealong.
FlG. ~2 snows a twelftn em~odimellt in whicn tne
support tape lU comprises a contirluous core ~e~ or stri~
111 of cloth covered on its wnole surface ~y a 7a~er 11
of water-resistant elastomeric material.
Accordin~ to a thirteenth embodiment of r'l~. ~3,
the support tape lu~ comprises a continuous core we~ or
strip 111 of cloth folded on itself into a pair of
superposed strip halves llla, lllb an~ covered on the
whole surface, except inner sùrface, of eacn strip nalf
llla, lllb by the water-resistant layer 11~. ~ach row o~
coupling scoops 104, 105 is mounted on the outer or
covered surface of the respective stri~ nalf llla, lllb.
A film 14 of thermoplastic synthetic resin is sandwicned
between the two stri~ halves llla, 111~ and is attached at
opposite sur~aces to the inner or non-covered surfaces of
tne two strip halves llla, lllb in a well known manner
~5 sucn as by applyin~ heat and æressure. hlternatively, the
inner confronting surfaces o~ the two stri~ nalves llla,
lllb may be bonded to one anotner by an adnesive. FI~. ~7
illustrates tne ~ater resistarlt stringer 1~ of ~1~. 2~ ~s
having ~een interen~aged witn a li~e companion strin~er
102'.
FiG. 24 showa a ~ourteenth embodiment in ~hich
tne support tape 10~ comprises a pair o~ su~erposed strips
111, 111 mad~ of water-resistant elastomeric material. In
production, each row of couplin~ scoops 104, 105 is
mounted on the outer surface of a respective one of tne
:.
.
~Z~ L'7
upper and lower strips lll, 111. Tnen a film 114 of
thermoplastic syntnetic resin is sandwiched between the
two strips 111, 111 and is attached at opposite faces to
the inner confronting surtaces of t~le two strips 111, 111
in a well kno~n manner such as by applying heat ana
pressure. Alternatively, the inner confrorltiny surfaces
of the two strips 111, 111 may be bonded to one anotner by
an adnesive.
FIG. ~ shows a fifteentn embodiment in whlcn tne
1~ support tape lU3 has on opposite sur~aces a pair of
longitudinal lugs lU~, 10~ that is out of alignment with
one another in a facewise direction of tne su~port tape
103. Thus the upper and lower coupling scoop rows 1~4,
105 are out of alignment with one another in a facewise
direction of the support tape lO~. ~ith this arrangement,
as shown in FIG. 2~, it is possible to provide the suppo~t
tape lU3 with a wide contact ed~e surface 1~3D wnich is
engageable with a corresponding wide contact edge surface
1~3b' of a like companion sup~ort tape 10~' in order to
~ effect an improved water-tiyntness between tne two support
tapes 1~
According to a sixteentn embodiment o~ k'IG. 26,
tne support tape 1~3 comprises a pair of su~erposed strips
111, 111 Ol clotn, each strip being covered on its whole
~5 sur~ace, except one or inner surface, ~y tne
water-resistant layer 11~. ln production, eacn row of
cou~ling scoops 104, 105 is mounted on the outer or
covered surface of a respective one of upper and lower
strips 111, 111. Then a film 114 of tnermoplastic
synthetic resin is sand~iched ~etween tne two strips 111,
111 and is attached at opposite faces to tne imler or
non-covered surfaces of the two strips 1l1, lll in a KIlOWn
manner such as by applying heat and pressure.
Alternatively, the inner confronting surfaces of the two
35 strips 111, 111 may be bonded to one anotner by all
- ,'~", ' :
~9~
adhesive.
rl'ne water-resistant strin~er 1~2 ot ~'iG. 2~ lS
produced in tne followin~ ~nanner. ~ pair of disen-Ja~ed
rows ~f coupling scoo~s 1~}, 1~5 is mounted on one or
water-resistant surface o~ tne stri~ lU3 alon~ the
reqpectiYe lollyitudinal lugs lUU, 1~ thereof. lnen the
strip 103 is folded on itself into a pair o~ su~erposed
strip halves along a longitudinal center line ~ (YlG. 29)
to form a lon4itudinal contact ed4e lO~b centrally between
10 the two couplin~ scoop rows 104, 1~5. E'inally~ the
opposed strip halves are joined together al their
confronting scoop-free surfaces by applying heat and
pressure, with a film 114 of thermoplastic syntnetic resin
sandwiched between tne t~o strip halves. ~lternatively,
the confronting surfaces of the two strip halves may ~e
bonded to one another by an auhesive.
To provide an inclined contact edge 1~3b, tne
strip 103 of the semi-produc-t shown in ~1~. 29 is $olded
on itself along a lon~itudinal off-center line k ~etween
tne opposea coupling scoo~ row lu4, 1~5.
in any one of tne embcdimellts descriDed a~ove,
slnce the water-resistant stringer ~, iO~ has a pair of
rows of cou~lin4 elements 4, 5; 104, 1~5 mounted on
opposite surfaces of a water-reslstant support ta~e ~,
103, the contact edge 3b, 10J~ of tne support ta~e ~
is en~ayeable With a correspondin~ contact ed~e 3~ 3~'
of a like companion strin4er's supyort tape ~ ' witn
improved wa~er-tightness as the op~osed ~trin~ers 2, ~';
102, 102' are coupled to~etner. ~urtner, ~ecause or tnis
double-coupllny construction, the water-resistant slide
fastener of the present invention can maintain an ade~uate
degree of water-ti~htness even when thrusting force is
exerted on the slide fastener from eitner facewise
direction.
Altnough various minor modifications may be
17 -
sugyested by those verse~ in the art, it snoul~ ~e
un~erstood tnat we Wi911 to embod~ witnin the scope OI the
patent which may issue hereon, all such embodin~ents as
reasond~ly an-l properly come wlth1n t~le scope of our
contribution to tne art.
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