CA1051171A - Slide fastener - Google Patents
Slide fastenerInfo
- Publication number
- CA1051171A CA1051171A CA263,848A CA263848A CA1051171A CA 1051171 A CA1051171 A CA 1051171A CA 263848 A CA263848 A CA 263848A CA 1051171 A CA1051171 A CA 1051171A
- Authority
- CA
- Canada
- Prior art keywords
- beaded
- teeth
- lower legs
- edge
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/02—Slide fasteners with a series of separate interlocking members secured to each stringer tape
- A44B19/04—Stringers arranged edge-to-edge when fastened, e.g. abutting stringers
Landscapes
- Slide Fasteners (AREA)
- Package Frames And Binding Bands (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A slide fastener includes a pair of stringer tapes each carrying on and along its inner longitudinal beaded edge a series of uniformly spaced, interengageable fastener elements.
Each of the fastener elements includes a body having a coupling head and a pair of upper and lower legs extending rearwardly from the coupling head. The upper and lower legs have a pair of oppositely disposed inner wall portions in the form of an arcuate concave surface which portions peripherally grip the beaded tape edge. The upper and lower legs have a plurality of teeth on the inner wall portions. Each tooth is disposed in biting engagement with the beaded tape edge to secure the fastener element in position against tilting movement relative thereto.
A slide fastener includes a pair of stringer tapes each carrying on and along its inner longitudinal beaded edge a series of uniformly spaced, interengageable fastener elements.
Each of the fastener elements includes a body having a coupling head and a pair of upper and lower legs extending rearwardly from the coupling head. The upper and lower legs have a pair of oppositely disposed inner wall portions in the form of an arcuate concave surface which portions peripherally grip the beaded tape edge. The upper and lower legs have a plurality of teeth on the inner wall portions. Each tooth is disposed in biting engagement with the beaded tape edge to secure the fastener element in position against tilting movement relative thereto.
Description
lOS1171 This invention relates generally to slide fasteners -and particularly to a slide fastener of the type having a pair of series of discrete fastener eIements carried along the inner longitudinal edge of opposed stringer tapes.
The prior art includes a wide variety of slide fasteners of the discrete t~vpe in which a series of interengageable fas-tener elements are mounted astride the longitudinal beaded edge of each of the oppositely disposed stringer tapes in ~mi-formly spaced apart relationship. Since slide fasteners of this type have a relatively increased coupling strength, they are often employed in beltless trousers such as jeans which are designed to tightly fit around the waist of a person who wears them to dispense with the need for a belt. In such an instance, severe lateral forces tending to pull the coupled stringer tapes away from each other are exerted on the slide -~astener. Therefore, the slider needs to be positively locked -in its uppermost position against downward movement along the fastener elements. To this end, the slider is provided with a locking prong formed on the pull tab, which prong is brought into locking engagement with the fastener elements within the guide channel of the slider to secure the same against movement along the fastener eléments when the pull tab lies flat against the slider. Various slide fasteners of the discrete type are known in which each of the fastener elements has ridges or teeth on its inner peripheral surface for biting or gripping engagement with the beaded tape edge so as to prevent the fas-tener elements from being shifted out of position relative to -and disengaged from the beaded tape edge. A common drawback of
The prior art includes a wide variety of slide fasteners of the discrete t~vpe in which a series of interengageable fas-tener elements are mounted astride the longitudinal beaded edge of each of the oppositely disposed stringer tapes in ~mi-formly spaced apart relationship. Since slide fasteners of this type have a relatively increased coupling strength, they are often employed in beltless trousers such as jeans which are designed to tightly fit around the waist of a person who wears them to dispense with the need for a belt. In such an instance, severe lateral forces tending to pull the coupled stringer tapes away from each other are exerted on the slide -~astener. Therefore, the slider needs to be positively locked -in its uppermost position against downward movement along the fastener elements. To this end, the slider is provided with a locking prong formed on the pull tab, which prong is brought into locking engagement with the fastener elements within the guide channel of the slider to secure the same against movement along the fastener eléments when the pull tab lies flat against the slider. Various slide fasteners of the discrete type are known in which each of the fastener elements has ridges or teeth on its inner peripheral surface for biting or gripping engagement with the beaded tape edge so as to prevent the fas-tener elements from being shifted out of position relative to -and disengaged from the beaded tape edge. A common drawback of
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. : . : . . . . . .
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these conventional slide fasteners is that the slider often fails to be positively locked and retained in place because the fastener elements are still liable to become tilted rela-tive to the beaded tape edge with the resultant disengagement of the locking prong with the fastener element within the slid-er guide channel when a severe lateral pull tending to separate the coupled stringer tapes away from each other is applied to the slide fastener. Another disadvantage is that even when the fas~ener element is tilted only slightl~ with respect to the beaded tape edge, the locking prong may go out of locking engagement therewith because the fastener elements have a relatively small contacting surface against which the locking prong abuts in its locked position. A further disadvantage is that the locking prong is susceptible to accelerated wear and deformation because the tilted fastener elements permit the locking prong to be forcibly disengaged therefrom when a severe lateral pull is exerted on the sllde fastener.
It is therefore an object of ~his invention to provide a slide fastener of the discrete type in which a series of unformaly spaced, interengageable fastener elements are mounted astride the longitudinal beaded edge of each of oppositely dis-posed stringer tapes with such sufficient stability that the fastener elements are prevented from tilting or inclining rela-tive to the beaded tape edge even when a severe lateral pull tending to separate the coupledstringer tapes away from each ;
other is applied to the slide fastener. :
Another object is to provide a slider fastener of the type described in which each of the fastener elements is pro-..
. : . : . . . . . .
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these conventional slide fasteners is that the slider often fails to be positively locked and retained in place because the fastener elements are still liable to become tilted rela-tive to the beaded tape edge with the resultant disengagement of the locking prong with the fastener element within the slid-er guide channel when a severe lateral pull tending to separate the coupled stringer tapes away from each other is applied to the slide fastener. Another disadvantage is that even when the fas~ener element is tilted only slightl~ with respect to the beaded tape edge, the locking prong may go out of locking engagement therewith because the fastener elements have a relatively small contacting surface against which the locking prong abuts in its locked position. A further disadvantage is that the locking prong is susceptible to accelerated wear and deformation because the tilted fastener elements permit the locking prong to be forcibly disengaged therefrom when a severe lateral pull is exerted on the sllde fastener.
It is therefore an object of ~his invention to provide a slide fastener of the discrete type in which a series of unformaly spaced, interengageable fastener elements are mounted astride the longitudinal beaded edge of each of oppositely dis-posed stringer tapes with such sufficient stability that the fastener elements are prevented from tilting or inclining rela-tive to the beaded tape edge even when a severe lateral pull tending to separate the coupledstringer tapes away from each ;
other is applied to the slide fastener. :
Another object is to provide a slider fastener of the type described in which each of the fastener elements is pro-..
- 3 -,. . ~ , , . . :
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vided with means cooperative with a slider for positively locking the latter against movement along the fastener elements.
In general terms, the present invention provides in a slide fastener including a pair of stringer tapes. .-each having an inner longitudinal beaded edge carrying on and along its inner longituainal beaded edge~ a series of uniformly spaced,. interengageable fastener elements, each of said fastener elements including.a body having a coupling head and a pair of upper and lower legs extending rearwardly ..
from said coupling ~ead and ha~ing ~ppositely disposed inner wall portions and opposite outer faces, each of ~aid upper and lower ~egs also having opposi~e flat side faces lying substantially at a right angle to saia outer ~ace and perpendicular to the plane of the stringer tape, the improvement wherein said inner wall 15 portions being in the ~orm of an arcuate conca~e surface, which . .
portions jointly provide a continuous inner peripheral surface of generally circular contour which is interrupted by a slot defined by the opposed edges of said upper and lower legs, and by said coupling head, said opposed edges being in gripping engagement wi~h t~e stringer tape, said peripheral surface peripherally gripping the beaded edge, said upper and lower legs having a plurality of teeth formed integrally therewith and projecting from the oppositely disposed inner wall portions into said peripheral surface, the respective teeth on said upper and ~5 lower legs being disposed in registry with one anoth~r, the teeth on ea~h leg bei~g ~paced apart along ~he length o~ the beaded tape edge and located substantially at the center.of ..
curvature of the inner wall porti~n where the leg is the most redu~ed in thi~kness as measured in ~e dire~tion perpendicular to the plane of the stringer tape ~o reinforce the leg at said ::
portion thereo~, the opposi~e teeth on each i~ner wall portion :
adjacent to their opposite peripheral edges being so ~isposed .:-~
- that their.respQ~tive outer side surfaces lie subs~antially _ ~ rl . i 1 4 ~
' .
~35i~7 i flush with the outer side ~aces of the leg, and each tooth being disposed in firm biting engagement with the point of the tooth embedded into the beaded tape edge to secure the fastener element in po~ition against both longitudinal and rotary displacement about the longitudinal path of the beaded tape edge.
Ms~y other ~dvantag~ and fe~tures of.~he pr~ssnt ln-.. vant~on will becom~ ma~ifes~ to tho~e ver~ed ~n ~he art upon .
maki~g re~rence to the deta~ lea dQ~cription a~d the accomr :
`-10 panying sheet o~ drawing~ in wh~ch ~ pr~errsd structural ~mbod~m3nt in~orporat~ng the princ~ple~ of the pre~e~t ~nvea-tlon ~B ~hown by way of exampla.
. 1 i8 a top plan vi~w og a ~llaO ~8t~Qr AC~Ord-ing to th~ ~nv~ntlon~ showing a pA~r o~ stri~g~r t ~ e~ couple~
toge~her4 Fig. 2 i~.a per~poctlve vi~w of tho f~tene~ el ~ t .
with part ~rok~n ~way for Gl~rity o lllu~tratio~t .
Flg. 3 1B a v~rtlcal ~ro0s-sact~onal v~o~ o~ one.of ~b~
~r~ng~r t~pQs~ a~a Flg. 4 iB a v~rti~al ~ro83-8~ctio~al ~1~ t~k~n ~lo~g .
the l~e rV-IV of Flg. 1.
F~g. 1 ~hows c ~llde ~t~r 10 comprC~lng a palr of . . .
oppo~ltely ~posed 8tr~g~r.tap~8 ~ ea~h h~vl~g ~ s~rl~
o~ ~n~ormly sp~cea apart~ l~t~reng~geable f~t~n~r ~em~ntg - .:
12 att~ho~ on ~n~ alo~ ~t~ longltua~ al b~a~ or r~l~for~
~d ~ago 13. The palr of ~erlo~ o~ ~as~ r ~l~m~t~ 12 ~n , th~ oppo~o~ ~tr~ng~r t~pes 11,11 hr~ take~ i~to ~h~ o~t o~ ; ~:
t~al ~ngagame~t by a ~ r ~not sho~n~ reclpr~c~bl~ ~lo~ .
.: :
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1 ~.
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~\jt I ' ~os~
the fastener elements 12 to close and open the slide fastener 10 . ,' Each of the fastener elements 12 includes a body 12a of generally U-shaped configuration having a coupling head 14 and S a pair of spaced apart upper and lower legs 15,16 formed inte- -grally with and extending rearwardly from the coupling head 14 at its upper and lower portions, respectively. The coupling ~ head 14 has a coupling recess (not shown) formed in one side ; thereof and an outwardly extending coupling projection 17 on the other side thereof. The coupling projection 17 is comple-; mentary in shape to the coupling recess so that the coupling projection 17 of each of the fastener elements 12 on one oF the stringer tapes 11,11 is snugly received in the coupling recess in its mating fastener element on the other stringer tape 11 when the slide fastener 10 is closed upon movement of the slid- ;
er along the fastener elements 12.
Each of the fastener elements 12 is attached to the stringer tape 11 with the upper and lower legs 15,16 arranged astride the longitudinal beaded tape edge 13 as best shown in Fig. 3. The fastener element 12 extends longitudinally sub-stantially at a right angle to the beaded tape edge 13 with the coupling head 14 projecting beyond the latter. The upper and lower legs 15,16 are mirror images of the other and hence are disposed symmetrically with respect to the longitudinal axis of the fastener element body 12a, as best shown in Fig. 3.
Each of the upper and lower legs 15,16 has an outer flat face -18 lying in a plane substantially parallel to the stringer tape 11 and opposite flat side faces 19,~0 lying substantially perpendicular to the stringer tape 11. The upper and lower legs 15,16 also have a pair of oppositely disposed inner wall portions 21,22 in the form of an arcuate, concave surface, which portions merge into a curved portion 23 of the coupling head 14 at their one ends to provide a continuous, smooth inner peripheral surface 24 of generally circular contour which is interrupted by a slot 25 defined by the opposed edges 26,27 of the legs 15,16. The slot extends substantially centrally of the height or thickness of the fastener element body 12a be-tween the opposite outer flat faces 18,18.
According to the invention, each of the upper and lowerlegs 15,16 has a pair of teeth 28,28 formed integrally there-with and projecting from the inner wall portion 21(22) toward the opposed leg. Each of the fastener elements 12 is clamped ~:
on and around the beaded tape edge 13 with the continuous peri~
pheral surface 24 peripherally embracing the beaded edge and with the pair of teeth 28,28 on each inner wall portion 21(22) disposed in biting or gripping engagement with the beaded edge 13, as best shown in Fig. 3, to eliminate the possibility of the fàstener elements 12 becoming tilted relative thereto or disengaged therefrom. In this condition, the opposed edges 26,27 are also held in gripping engagement with the stringer tape 11 closely adjacent to the beaded tape edge 13. Each of .
the teeth 28 terminates short of the plane of the stringer : ~
tape 11. :
The fastener element 12 has the upper and lower legs 15,16 initially flared outwardly prior to attachment to the ;
beaded tape edge 13, and the legs 15,16 are deformed ox press-~S~L~7~
ed toward each other from the outwardly-flared configuration into a compressed configuration as shown in the drawings to bring the legs 15,16 into clamping or gripping engagement with the beaded tape edge 13 with the teeth 28 on the legs held in firm biting engagement therewith.
The pair of teeth 28,28 on the inner wall portion 21 are disposed in registry with the other pair of teeth 28,28 on the inner wall portion 22, and the teeth 28,28 on each inner wall portion is spaced apart from each other along the length of the beaded tape edge. Each of the teeth 28 is located substantial- ;
ly at the center of curvature of the arcuate inner wall portion 21(22). In other words, the two pairs of teeth 28 on the inner wall portions 21,22 are located at the thinnestportions 29,29 of the legs 15,16 in diametricall~ opposed relationship when viewed in the direction of the length of the beaded tape edge 13. Thus, the pair of teeth 28,28 on each leg 15(16) serve to increase its mechanical strength at its weakest portion 29.
This prevents the upper and lower legs 15,16 from being deform-ed away from each otherin a direction perpendicular to the stringer tape 11 when the slide fastener 10 is subjected to severe external stresses, thereby ensuring that the legs 15,16 can be positively held in firm gripping engagement with the `-beadéd tape edge 13.
Each of the teeth 28 is of wedge-shaped configuration having a pair of opposite parallel, flat side surfaces 30,30 and a pair of inclined surfaces 31,31 converging outwardly toward its distal or outer edge.
Each side surface 30 has a substantially triangular L7~L
~ ,.
shape as best shown in Fig. 3. Preferably, the pair of teeth 28,28 on each leg 15(16) are so disposed that their respective outer side surfaces 30,30 lie flush with the side flat faces 19,20, respectively, as best shown in Figs. 2 and 4. Alter- - -natively, each pair of teeth 28,28 may be disposed closely adjacent to the opposite peripheral edges of ~he inner peri-pheral surface 24 so that the outer side surfaces 30,30 are disposed slightly inwardly of the side ~aces 19,20. As mention-ed previously, each tooth 28 bites into the beaded tape edge 13 so that it deforms the tape edge 13 immediately adjacent to the outer side surface 30 to provide a depressed region 32 as shown -;
in Fig. 4. The slider is provided with a locking prong 33 at -one end as indicated in dotted lines in Fig. 4 which prong is selectively brought into locking engagement with one of the fastener elements 12 within the guide channel of the slider to ;`
thereby secure the slider against movement along the fastener -~
elements when the pull tab lies flat against the slider. More specifically, in the locked position of the slider, the lock-ing prong 33 has its distal end portion disposed in the depress-ed region 32 in close contact relation to the outer side face 19 and outer side surface 30 as shown in Fig. 4. Thus, the area of contact of the fastener element 12 with the locking prong 33 is increased by virture of the provision of the tooth 28.
This ensures that the locking prong 33 can positively be held in locking engagement with the fastener element in the locked position of the slider even when a severe lateral pull is ex-erted on the coupled stringer tapes 11,11. i Although various minor modifications may be suggested by ". ' 9 '.
~ o~those versed in the art, it should be understood that we wish to embody within the scope of the patent warranted hereon, all such embodiments as reasonably and properly come within the .
scope of our contribution to the art.
, .. ~ . .
:~s~
vided with means cooperative with a slider for positively locking the latter against movement along the fastener elements.
In general terms, the present invention provides in a slide fastener including a pair of stringer tapes. .-each having an inner longitudinal beaded edge carrying on and along its inner longituainal beaded edge~ a series of uniformly spaced,. interengageable fastener elements, each of said fastener elements including.a body having a coupling head and a pair of upper and lower legs extending rearwardly ..
from said coupling ~ead and ha~ing ~ppositely disposed inner wall portions and opposite outer faces, each of ~aid upper and lower ~egs also having opposi~e flat side faces lying substantially at a right angle to saia outer ~ace and perpendicular to the plane of the stringer tape, the improvement wherein said inner wall 15 portions being in the ~orm of an arcuate conca~e surface, which . .
portions jointly provide a continuous inner peripheral surface of generally circular contour which is interrupted by a slot defined by the opposed edges of said upper and lower legs, and by said coupling head, said opposed edges being in gripping engagement wi~h t~e stringer tape, said peripheral surface peripherally gripping the beaded edge, said upper and lower legs having a plurality of teeth formed integrally therewith and projecting from the oppositely disposed inner wall portions into said peripheral surface, the respective teeth on said upper and ~5 lower legs being disposed in registry with one anoth~r, the teeth on ea~h leg bei~g ~paced apart along ~he length o~ the beaded tape edge and located substantially at the center.of ..
curvature of the inner wall porti~n where the leg is the most redu~ed in thi~kness as measured in ~e dire~tion perpendicular to the plane of the stringer tape ~o reinforce the leg at said ::
portion thereo~, the opposi~e teeth on each i~ner wall portion :
adjacent to their opposite peripheral edges being so ~isposed .:-~
- that their.respQ~tive outer side surfaces lie subs~antially _ ~ rl . i 1 4 ~
' .
~35i~7 i flush with the outer side ~aces of the leg, and each tooth being disposed in firm biting engagement with the point of the tooth embedded into the beaded tape edge to secure the fastener element in po~ition against both longitudinal and rotary displacement about the longitudinal path of the beaded tape edge.
Ms~y other ~dvantag~ and fe~tures of.~he pr~ssnt ln-.. vant~on will becom~ ma~ifes~ to tho~e ver~ed ~n ~he art upon .
maki~g re~rence to the deta~ lea dQ~cription a~d the accomr :
`-10 panying sheet o~ drawing~ in wh~ch ~ pr~errsd structural ~mbod~m3nt in~orporat~ng the princ~ple~ of the pre~e~t ~nvea-tlon ~B ~hown by way of exampla.
. 1 i8 a top plan vi~w og a ~llaO ~8t~Qr AC~Ord-ing to th~ ~nv~ntlon~ showing a pA~r o~ stri~g~r t ~ e~ couple~
toge~her4 Fig. 2 i~.a per~poctlve vi~w of tho f~tene~ el ~ t .
with part ~rok~n ~way for Gl~rity o lllu~tratio~t .
Flg. 3 1B a v~rtlcal ~ro0s-sact~onal v~o~ o~ one.of ~b~
~r~ng~r t~pQs~ a~a Flg. 4 iB a v~rti~al ~ro83-8~ctio~al ~1~ t~k~n ~lo~g .
the l~e rV-IV of Flg. 1.
F~g. 1 ~hows c ~llde ~t~r 10 comprC~lng a palr of . . .
oppo~ltely ~posed 8tr~g~r.tap~8 ~ ea~h h~vl~g ~ s~rl~
o~ ~n~ormly sp~cea apart~ l~t~reng~geable f~t~n~r ~em~ntg - .:
12 att~ho~ on ~n~ alo~ ~t~ longltua~ al b~a~ or r~l~for~
~d ~ago 13. The palr of ~erlo~ o~ ~as~ r ~l~m~t~ 12 ~n , th~ oppo~o~ ~tr~ng~r t~pes 11,11 hr~ take~ i~to ~h~ o~t o~ ; ~:
t~al ~ngagame~t by a ~ r ~not sho~n~ reclpr~c~bl~ ~lo~ .
.: :
5 ~
1 ~.
- ' '1, . ~' .
~\jt I ' ~os~
the fastener elements 12 to close and open the slide fastener 10 . ,' Each of the fastener elements 12 includes a body 12a of generally U-shaped configuration having a coupling head 14 and S a pair of spaced apart upper and lower legs 15,16 formed inte- -grally with and extending rearwardly from the coupling head 14 at its upper and lower portions, respectively. The coupling ~ head 14 has a coupling recess (not shown) formed in one side ; thereof and an outwardly extending coupling projection 17 on the other side thereof. The coupling projection 17 is comple-; mentary in shape to the coupling recess so that the coupling projection 17 of each of the fastener elements 12 on one oF the stringer tapes 11,11 is snugly received in the coupling recess in its mating fastener element on the other stringer tape 11 when the slide fastener 10 is closed upon movement of the slid- ;
er along the fastener elements 12.
Each of the fastener elements 12 is attached to the stringer tape 11 with the upper and lower legs 15,16 arranged astride the longitudinal beaded tape edge 13 as best shown in Fig. 3. The fastener element 12 extends longitudinally sub-stantially at a right angle to the beaded tape edge 13 with the coupling head 14 projecting beyond the latter. The upper and lower legs 15,16 are mirror images of the other and hence are disposed symmetrically with respect to the longitudinal axis of the fastener element body 12a, as best shown in Fig. 3.
Each of the upper and lower legs 15,16 has an outer flat face -18 lying in a plane substantially parallel to the stringer tape 11 and opposite flat side faces 19,~0 lying substantially perpendicular to the stringer tape 11. The upper and lower legs 15,16 also have a pair of oppositely disposed inner wall portions 21,22 in the form of an arcuate, concave surface, which portions merge into a curved portion 23 of the coupling head 14 at their one ends to provide a continuous, smooth inner peripheral surface 24 of generally circular contour which is interrupted by a slot 25 defined by the opposed edges 26,27 of the legs 15,16. The slot extends substantially centrally of the height or thickness of the fastener element body 12a be-tween the opposite outer flat faces 18,18.
According to the invention, each of the upper and lowerlegs 15,16 has a pair of teeth 28,28 formed integrally there-with and projecting from the inner wall portion 21(22) toward the opposed leg. Each of the fastener elements 12 is clamped ~:
on and around the beaded tape edge 13 with the continuous peri~
pheral surface 24 peripherally embracing the beaded edge and with the pair of teeth 28,28 on each inner wall portion 21(22) disposed in biting or gripping engagement with the beaded edge 13, as best shown in Fig. 3, to eliminate the possibility of the fàstener elements 12 becoming tilted relative thereto or disengaged therefrom. In this condition, the opposed edges 26,27 are also held in gripping engagement with the stringer tape 11 closely adjacent to the beaded tape edge 13. Each of .
the teeth 28 terminates short of the plane of the stringer : ~
tape 11. :
The fastener element 12 has the upper and lower legs 15,16 initially flared outwardly prior to attachment to the ;
beaded tape edge 13, and the legs 15,16 are deformed ox press-~S~L~7~
ed toward each other from the outwardly-flared configuration into a compressed configuration as shown in the drawings to bring the legs 15,16 into clamping or gripping engagement with the beaded tape edge 13 with the teeth 28 on the legs held in firm biting engagement therewith.
The pair of teeth 28,28 on the inner wall portion 21 are disposed in registry with the other pair of teeth 28,28 on the inner wall portion 22, and the teeth 28,28 on each inner wall portion is spaced apart from each other along the length of the beaded tape edge. Each of the teeth 28 is located substantial- ;
ly at the center of curvature of the arcuate inner wall portion 21(22). In other words, the two pairs of teeth 28 on the inner wall portions 21,22 are located at the thinnestportions 29,29 of the legs 15,16 in diametricall~ opposed relationship when viewed in the direction of the length of the beaded tape edge 13. Thus, the pair of teeth 28,28 on each leg 15(16) serve to increase its mechanical strength at its weakest portion 29.
This prevents the upper and lower legs 15,16 from being deform-ed away from each otherin a direction perpendicular to the stringer tape 11 when the slide fastener 10 is subjected to severe external stresses, thereby ensuring that the legs 15,16 can be positively held in firm gripping engagement with the `-beadéd tape edge 13.
Each of the teeth 28 is of wedge-shaped configuration having a pair of opposite parallel, flat side surfaces 30,30 and a pair of inclined surfaces 31,31 converging outwardly toward its distal or outer edge.
Each side surface 30 has a substantially triangular L7~L
~ ,.
shape as best shown in Fig. 3. Preferably, the pair of teeth 28,28 on each leg 15(16) are so disposed that their respective outer side surfaces 30,30 lie flush with the side flat faces 19,20, respectively, as best shown in Figs. 2 and 4. Alter- - -natively, each pair of teeth 28,28 may be disposed closely adjacent to the opposite peripheral edges of ~he inner peri-pheral surface 24 so that the outer side surfaces 30,30 are disposed slightly inwardly of the side ~aces 19,20. As mention-ed previously, each tooth 28 bites into the beaded tape edge 13 so that it deforms the tape edge 13 immediately adjacent to the outer side surface 30 to provide a depressed region 32 as shown -;
in Fig. 4. The slider is provided with a locking prong 33 at -one end as indicated in dotted lines in Fig. 4 which prong is selectively brought into locking engagement with one of the fastener elements 12 within the guide channel of the slider to ;`
thereby secure the slider against movement along the fastener -~
elements when the pull tab lies flat against the slider. More specifically, in the locked position of the slider, the lock-ing prong 33 has its distal end portion disposed in the depress-ed region 32 in close contact relation to the outer side face 19 and outer side surface 30 as shown in Fig. 4. Thus, the area of contact of the fastener element 12 with the locking prong 33 is increased by virture of the provision of the tooth 28.
This ensures that the locking prong 33 can positively be held in locking engagement with the fastener element in the locked position of the slider even when a severe lateral pull is ex-erted on the coupled stringer tapes 11,11. i Although various minor modifications may be suggested by ". ' 9 '.
~ o~those versed in the art, it should be understood that we wish to embody within the scope of the patent warranted hereon, all such embodiments as reasonably and properly come within the .
scope of our contribution to the art.
, .. ~ . .
Claims (2)
1. The a slide fastener including a pair of stringer tapes each having an inner longitudinal beaded edge carrying on and along its inner longitudinal beaded edge, a series of uniformly spaced, interengageable fastener elements, each of said fastener elements including a body having a coupling head and a pair of upper and lower legs extending rearwardly from said coupling head and having oppositely disposed inner wall portions and opposite outer faces, each of said upper and lower legs also having opposite flat side faces lying substantially at a right angle to said outer face and perpendicular to the plane of the stringer tape, the improvement wherein said inner wall portions being in the form of an arcuate concave surface, which portions jointly provide a continuous inner peripheral surface of generally circular contour which is interrupted by a slot defined by the opposed edges of said upper and lower legs, and by said coupling head, said opposed edges being in gripping engagement with the stringer tape, said peripheral surface peripherally gripping the beaded edges said upper and lower legs having a plurality of teeth formed integrally therewith and projecting from the oppositely disposed inner wall portions into said peripheral surface, the respective teeth on said upper and lower legs being disposed in registry with one another, the teeth on each leg being spaced apart along the length of the beaded tape edge and located substantially at the center of curvature of the inner wall portion where the leg is the most reduced in thickness as measured in the direction perpendicular to the plane of the stringer tape to reinforce the leg at said portion thereof, the opposite teeth on each inner wall portion adjacent to their opposite peripheral edges being so disposed that their respective outer side surfaces lie substantially flush with the outer side faces of the leg, and each tooth being disposed in firm biting engagement with the point of the tooth embedded into the beaded tape edge to secure the fastener element in position against both longitudinal and rotary displacement about the longitudinal path of the beaded tape edge.
2. The improvement according to Claim 1, in which each of said teeth is of wedge shaped configuration having a pair of inclined surfaces converging outwardly toward its distal end, each of said side surfaces being of substantially triangular shape when viewed in the direction of the length of the beaded tape edge.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14984075U JPS5264106U (en) | 1975-10-31 | 1975-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051171A true CA1051171A (en) | 1979-03-27 |
Family
ID=15483795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA263,848A Expired CA1051171A (en) | 1975-10-31 | 1976-10-21 | Slide fastener |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5264106U (en) |
| AT (1) | AT363883B (en) |
| AU (1) | AU504074B2 (en) |
| BE (1) | BE847815A (en) |
| BR (1) | BR7607114A (en) |
| CA (1) | CA1051171A (en) |
| CH (1) | CH602362A5 (en) |
| DE (1) | DE2648823C2 (en) |
| ES (1) | ES224152Y (en) |
| FR (1) | FR2329222A1 (en) |
| GB (1) | GB1535572A (en) |
| HK (1) | HK12880A (en) |
| IT (1) | IT1075974B (en) |
| NL (1) | NL7612033A (en) |
| SE (1) | SE413281B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5927667B2 (en) * | 1979-10-29 | 1984-07-07 | ワイケイケイ株式会社 | Method and device for forming elements for slide fasteners |
| KR102059847B1 (en) * | 2016-05-06 | 2019-12-27 | 와이케이케이 가부시끼가이샤 | Fastener element, apparatus for manufacturing fastener element, and method for manufacturing fastener element |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2075763A (en) * | 1937-03-30 | Method of making same | ||
| GB454995A (en) * | 1936-02-10 | 1936-10-12 | Jean Bigeard | Improvements in sliding clasp fasteners |
| GB696368A (en) * | 1950-04-26 | 1953-08-26 | Grafton & Son Walter | Improvements in or relating to sliding clasp fasteners |
| GB900156A (en) * | 1960-03-07 | 1962-07-04 | Talon Inc | Fastener elements for slide fasteners and method and apparatus for making such elements |
-
1975
- 1975-10-31 JP JP14984075U patent/JPS5264106U/ja active Pending
-
1976
- 1976-10-21 CA CA263,848A patent/CA1051171A/en not_active Expired
- 1976-10-22 GB GB4390576A patent/GB1535572A/en not_active Expired
- 1976-10-25 BR BR7607114A patent/BR7607114A/en unknown
- 1976-10-27 DE DE19762648823 patent/DE2648823C2/en not_active Expired
- 1976-10-28 AU AU19113/76A patent/AU504074B2/en not_active Expired
- 1976-10-28 SE SE7612003A patent/SE413281B/en not_active IP Right Cessation
- 1976-10-28 AT AT801976A patent/AT363883B/en not_active IP Right Cessation
- 1976-10-29 BE BE171941A patent/BE847815A/en not_active IP Right Cessation
- 1976-10-29 NL NL7612033A patent/NL7612033A/en active Search and Examination
- 1976-10-29 FR FR7632810A patent/FR2329222A1/en active Granted
- 1976-10-29 CH CH1368076A patent/CH602362A5/xx not_active IP Right Cessation
- 1976-10-29 IT IT6960776A patent/IT1075974B/en active
- 1976-10-29 ES ES1976224152U patent/ES224152Y/en not_active Expired
-
1980
- 1980-03-13 HK HK12880A patent/HK12880A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2648823A1 (en) | 1977-05-12 |
| DE2648823C2 (en) | 1983-01-13 |
| IT1075974B (en) | 1985-04-22 |
| ES224152Y (en) | 1977-05-01 |
| NL7612033A (en) | 1977-05-03 |
| SE7612003L (en) | 1977-05-01 |
| CH602362A5 (en) | 1978-07-31 |
| BE847815A (en) | 1977-02-14 |
| GB1535572A (en) | 1978-12-13 |
| FR2329222A1 (en) | 1977-05-27 |
| FR2329222B1 (en) | 1979-03-02 |
| AT363883B (en) | 1981-09-10 |
| AU1911376A (en) | 1978-05-04 |
| AU504074B2 (en) | 1979-10-04 |
| ES224152U (en) | 1977-01-01 |
| HK12880A (en) | 1980-03-21 |
| SE413281B (en) | 1980-05-19 |
| JPS5264106U (en) | 1977-05-12 |
| BR7607114A (en) | 1977-09-13 |
| ATA801976A (en) | 1981-02-15 |
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