Locking slide fastener slider

In a locking slide fastener slider, an upper wing has on its lower surface a central ledge extending from a guide post to the rear end so as to define a pair of side recesses one on each side of the central ledge. The central ledge has a large-width portion extending from around a base of the guide post and terminating midway to the rear end an intermediate tapering portion contiguous to the large-width portion, and a small-width portion extending from the tapering portion to the rear end. An inclined slope is formed along the boundary of the central ledge and one of side recesses. A locking-pawl-insertion through-hole extends transversely from the central ledge into one side recess across the slope.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a locking slide fastener slider of automatic, 
semi-automatic or manual type, and more particularly to the shape of a 
locking-pawl-insertion through-hole, which is part of a locking mechanism 
on a slider body. 
2. Description of the Related Art 
In some of conventional locking sliders of the automatic, semi-automatic or 
manual type, a locking-pawl-insertion through-hole in the form of a square 
slot is located in a central ledge extending on the lower surface of an 
upper wing from a guide post to the rear end of a guide channel in which a 
pair of rows of fastener elements is to be guided. And in others of the 
conventional locking sliders, such locking-pawl-insertion through-hole is 
located in one of opposite side recesses, one on each side of the central 
ledge, in the lower surface of the upper wing. 
Japanese Utility Model Laid-Open Publication No. Sho 57-7313 discloses a 
locking slider as shown in FIG. 11 of the accompanying drawings of the 
present specification. In this slider, a square locking-pawl-insertion 
through-hole 15' is located about a center of a central ledge 10' on the 
lower surface of an upper wing 2', and a plate-like locking pawl 21' is 
automatically inserted into a space between adjacent legs of one of 
opposed rows of fastener elements being coupled together in a guide 
channel 6' of a slider body 1' to temporarily stop the sliding of the 
slider. 
U.S. Pat. No. 2,901,803 discloses a locking slider as shown in FIG. 12 of 
the accompanying drawings of the present specification. In this slider, a 
rectangular locking-pawl-insertion through-hole 15" is located in one of 
opposite side recesses 9" at a position toward the rear end of the guide 
channel 6", off a central ledge 10" on the lower surface of the upper wing 
2", and a longitudinally elongated locking pawl 21" is inserted into the 
locking-pawl-insertion through-hole 15" to automatically press the legs of 
one of opposed rows of fastener elements being coupled together in the 
guide channel 6" of a slider body 1", thus temporarily stop the slider. 
In either locking slider of the above-named publications, partly since the 
locking pawl presses the legs of the coupled fastener elements or is 
inserted into a space between adjacent legs at a position in the central 
ledge or in the one side recess to automatically stop the sliding of the 
slider, and partly since the locking-pawl-insertion through-hole is 
located in a flat area, possible influence on the fastener elements due to 
the locking-pawl-insertion through-hole would not be very much. 
Whereas in the locking slider according to this invention, the 
locking-pawl-insertion through-hole is located in and across the boundary 
between the central ledge and one of opposite side recesses in the guide 
channel. Either of the above-named prior art publications is totally 
silent about this concept. Still, with a hypothetical combination of the 
locking-pawl-insertion through-holes of these prior art forms, a squared 
step was created in the locking-pawl-insertion through-hole at the 
boundary between the central ledge and the side recess and due to this 
stepped locking-pawl-insertion through-hole, the frictional resistance of 
the fastener elements would become large so that smooth sliding of the 
slider could not be realized and the fastener elements would be damaged by 
the locking-pawl-insertion through-hole. Having the surfaces of the legs 
of the fastener elements with scratches, the slide fastener would be 
unsightly. 
SUMMARY OF THE INVENTION 
It is therefore a first object of the invention to provide an autolock, 
semi-autolock or manual-lock slide fastener slider which can reduce an 
influence on fastener elements and can slide smoothly even though a 
locking-pawl-insertion through-hole extends across a step between a 
central ledge and a side recess on the lower surface of an upper wing, 
thus keeping the fastener elements neat in appearance free from any damage 
such as scratch during repeated use. 
A second object of the invention is to provide an autolock, semi-autolock 
or manual-lock slide fastener slider which can minimize a possible 
frictional resistance of fastener elements on the lower surface of the 
upper wing around the locking-pawl-insertion through-hole, thus guiding 
the fastener elements smoothly. 
A third object of the invention is to provide an autolock, semi-autolock or 
manual-lock slide fastener slider whose upper wing has on its lower side a 
guide surface suitable particularly to a fastener chain with opposed 
fastener element rows made of thermoplastic synthetic monofilaments, thus 
enabling smooth and reliable guiding of the fastener elements without 
damage such as scratch. 
A fourth object of the invention is to provide an autolock, semi-autolock 
or manual-lock slide fastener slider which has a unique 
locking-pawl-insertion through-hole suitable to a fastener chain with 
opposed fastener element rows made of thermoplastic synthetic 
monofilaments and optimal to a plate-like locking pawl. 
A fifth object of the invention is to provide a semi-autolock or 
manual-lock slide fastener slider which has a unique 
locking-pawl-insertion through-hole suitable to a fastener chain having 
opposed fastener element rows made of thermoplastic synthetic 
monofilaments and optimal to a locking pawl projecting perpendicularly 
from a pull tub near its axle. 
A sixth object of the invention is to provide an autolock, semi-autolock or 
manual-lock slide fastener slider which has a unique 
locking-pawl-insertion through-hole suitable particularly to a locking 
pawl pivotally movable transversely of the slider body. 
A seventh object of the invention is to provide an autolock, semi-autolock 
or manual-lock slide fastener slider in which the locking-pawl-insertion 
through-hole is located in such a position that fastener elements can be 
very easily deformed and the locking pawl can simply insert between legs 
of the fastener elements, thus enabling smooth locking operation 
An eighth object of the invention is to provide an autolock, semi-autolock 
or manual-lock slide fastener slider in which a locking pawl suitable to a 
locking-pawl-insertion through-hole extending across a slope between a 
central ledge and a side recess is pivotally movable about the axis 
longitudinal of the slider body, thus enabling a reliable and efficient 
locking function and a smooth movement on the fastener chain. 
A ninth object of the invention is to provide an autolock slide fastener 
slider in which a locking pawl suitable to a locking-pawl-insertion 
through-hole extending across a slope between a central ledge and a side 
recess is able to retractably project into the guide channel automatically 
and resiliently, thus enabling a reliable and efficient locking function 
and a smooth movement on the fastener chain. 
A tenth object of the invention is to provide a semi-autolock or 
manual-lock slide fastener slider in which a locking pawl suitable to a 
locking-pawl-insertion through-hole extending across a slope between a 
central ledge and a side recess is able to retractably project into the 
guide channel, thus enabling a reliable and efficient locking function and 
smooth movement on the fastener chain. 
According to a first aspect of the invention, the first object is 
accomplished by an autolock, semi-autolock or manual-lock slide fastener 
slider comprising a slider body, a pull tab and a locking mechanism as 
follows. The slider body composed of upper and lower wings joined at their 
front ends by a guide post so as to define between the upper and lower 
wings a guide channel. The upper wing has a locking-pawl-insertion 
through-hole communicating with the guide channel. The pull tab is 
connected to the slider body. The locking mechanism is supported by the 
upper wing and includes a locking pawl inserted in the 
locking-pawl-insertion through-hole for retractably projecting into the 
guide channel in an automatic, semi-automatic or manual action. The upper 
wing has on its lower surface a central ledge extending from the guide 
post to a rear end of the guide channel. It defines in the lower surface 
of the upper wing a pair of side recesses one on each side of the central 
ledge. The locking-pawl-insertion through-hole extends transversely from 
the central ledge into one of the side recesses. The lower surface of the 
upper wing further comprises a slope extending along a boundary of the 
central ledge and the one side recess. 
According to a second aspect of the invention, the central ledge has a 
large-width portion, an intermediate tapering portion, and a small-width 
portion. The large-width portion extends, by a uniform width, from a 
protuberance which is formed around a base of the guide post and 
terminates midway to the rear end of the guide channel. The intermediate 
tapering portion is contiguous to the large-width portion and gradually 
decreases in width toward and terminates short of the rear end of the 
guide channel. And the small-width portion contiguous to the intermediate 
tapering portion and extending to the rear end of the guide channel by a 
uniform width. 
According to a third aspect of the invention, the protuberance and the 
central ledge have a flat surface for covering a possible path of 
successive coupling heads of opposed rows of filamentary fastener 
elements. Also, the slope extends along the large-width portion of the 
central ledge forward and rearward of the locking-pawl-insertion 
through-hole for covering a possible path of successive legs of one row of 
the fastener elements. 
According to a fourth aspect of the invention, the locking-pawl-insertion 
through-hole extends transversely from the small-width portion of the 
central ledge into the one side recess. The slope extends forward and 
rearward of the locking-pawl-insertion through-hole and contiguously 
connects the one side recess with the large-width and small-width portions 
of the central ledge. 
According to a fifth aspect of the invention, the locking-pawl-insertion 
through-hole is in the form of a slot extending longitudinally of the 
slider body. The slope extends forward and rearward of the 
locking-pawl-insertion through-hole. 
According to a sixth aspect of the invention, the locking-pawl-insertion 
through-hole is in the form of a rectangular slot extending 
perpendicularly across the longitudinal center line of the central ledge. 
According to a seventh aspect of the invention, the locking-pawl-insertion 
through-hole covers or extends close to a possible meeting point of 
opposed rows of the successive coupling heads of the fastener elements. 
According to a eighth aspect of the invention, the locking pawl is 
supported on the upper wing for pivotal movement about the axis extending 
longitudinally of the slider body to pivotally project into and retract 
from the guide channel. 
According to a ninth aspect of the invention, the locking pawl is one end 
of a leaf spring and normally projects into the guide channel under the 
resiliency of the leaf spring. 
According to a tenth aspect of the invention, a pull tab having at one end 
a transverse axle is supported on the upper wing for pivotal movement 
about the axle. The pull tab has, at its one end adjacent to said axle, 
the locking pawl which is projecting perpendicularly from the pull tab and 
which is pivotally movable about the axle to pivotally and retractably 
project into the guide channel in response to the pivotal movement of the 
pull tab.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Various preferred embodiments of this invention will now be described in 
detail with reference to the accompanying drawings. 
FIG. 1 shows a locking slide fastener slider according to a first 
embodiment of the invention. In this slider, a slider body 1 is composed 
of upper and lower wings 2, 3 joined at their front ends by a guide post 4 
and each having a pair of guide flanges 5 bent from its opposite side 
edges so as to define between the upper and lower wings 2, 3 a guide 
channel 6. Preferably the slider body 1 is molded of metal such as 
aluminum or zinc alloy by die casting. The upper wing 2 or the lower wings 
3 may be devoid of the guide flanges 5, and alternatively the guide 
flanges 5 of one wing may be lower in height than those of the other wing. 
For an illustrative example, a fastener chain being used here includes, as 
shown in FIG. 5, a pair of fastener tapes and a pair of fastener element 
rows E, each in the form of a coiled thermoplastic monofilament, attached 
to confronting longitudinal edges of the fastener tapes by sewing threads 
T; consequently, the guide flanges 5 of the lower wing 3 are lower in 
height than those of the upper wing 2. 
The upper wing 2 has, as shown in FIGS. 3 and 4, on its lower surface a 
central ledge 10 extending from around the base of the guide post 4 toward 
a rear end 7 of the guide channel 6. The central ledge 10 is in contact 
with successive coupling heads H of the fastener elements E and serves to 
guide the sewing threads T holding successive legs L, as shown in FIG. 5. 
The central ledge 10 has a large-width portion 12 extending from a 
protuberance 11 which is formed around the base of the guide post 4 and 
terminating substantially midway to the rear end 7 of the guide channel 6, 
an intermediate tapering portion contiguous to the large-width portion 12 
and decreasing in width toward the rear end 7, and a small-width portion 
13 extending from the intermediate tapering portion to the rear end 7. 
The central ledge 10 contiguous to the protuberance 11 has a flat surface 
for covering a possible path of the successive coupling heads H of opposed 
rows of the fastener elements E. As shown in FIG. 6, the upper wing 2 has 
a locking-pawl-insertion through-hole 15 in the form of a rectangular slot 
communicating with the guide channel 6 and extending from one of the side 
recesses 9 to the central ledge 10 perpendicularly across the longitudinal 
central line of the central ledge 10 and passing a possible meeting point 
P of opposed rows of the successive coupling heads H of the fastener 
elements E. 
The lower surface of the upper wing 2 has also a gentle slope 14 extending 
along a boundary of the central ledge 10 and the one side recess 9. The 
slope 14 laterally inclined from the central ledge 10 toward the one side 
recess 9 so as to contiguously connect them. Specifically, the slope 14 
extends from the large-width portion 12 and the intermediate tapering 
portion through their entire length longitudinally of the slider body 1. 
The slope 14 is divided into front and rear parts by the 
locking-pawl-insertion through-hole 15 and contiguous to the large-width 
portion 12 and the intermediate tapering portion, respectively, so as not 
to cover the possible path of the coupling heads H of the fastener 
elements E. Thus there exists no squared step between the central ledge 10 
and the one side recess 9 at either of front and rear sides of the 
locking-pawl-insertion through-hole 15. Accordingly, in the absence of 
such a step of the locking-pawl-insertion through-hole 15, when the 
fastener elements E are guided by the central ledge 10 in response to 
movement of the slider body 1 along the fastener chain, the legs L 
smoothly slide without receiving any possible impact from the 
locking-pawl-insertion through-hole 15 and therefore the legs L are kept 
free from any damage such as scratch. 
FIGS. 1 and 2 show an example to which the foregoing locking-pawl-insertion 
through-hole 15 of the upper wing 2 is optimal. In this slider, the slider 
body 1 has in an upper surface of the upper wing 2 a longitudinally 
extending central groove 16 in which a manipulating lever 20 is received. 
The manipulating lever 20 is in the form of a rod-like shaft having at its 
rear end a tab 22 and the locking pawl 21 projecting from a substantially 
central position of the manipulating lever 20 in a direction perpendicular 
to both the manipulating lever 20 and the tab 22. On its peripheral 
surface opposite to the locking pawl 21, the manipulating lever 20 has a 
cam 23 against which a leaf spring 24 is resiliently pressed. The 
manipulating lever 20 together with the leaf spring 24 is concealed by a 
cover 25 to which a pull tab 30 is pivotally attached. Thus the 
semi-autolock slider is completed whose locking function will be described 
as follows: 
In operation, when the manipulating lever 20 is turned about its axis from 
a phantom-line position to a solid-line position in FIG. 1 by gripping the 
tab 22, the locking pawl 21 pivotally projects into the guide channel 6 
via the locking-pawl-insertion through-hole 15 to penetrate between the 
legs L of the fastener elements E (see FIG. 5) under the resilience of the 
spring 24, thus stopping sliding of the slider. Then when the manipulation 
lever 20 is turned back to the original position (counterclockwise in FIG. 
2) against the resilience of the spring 24, the locking pawl 21 pivotally 
retracts from the legs L of the fastener elements E to release the slider 
so that the slider can be freely slid when pulled by the pull tab 30. 
The locking-pawl-insertion through-hole 15 should preferably extend so as 
to cover a possible meeting point P of opposed rows of fastener elements 
E; although this feature is not a must. As long as the 
locking-pawl-insertion through-hole 15 exists close to the meeting point 
P, the condition to stop the slider is satisfied. The reasons why the 
locking-pawl-insertion through-hole 15 should preferably cover the meeting 
point P are that it would facilitate deforming the fastener elements E and 
that it would be convenient particularly if the locking pawl 21 is large 
in size and/or stroke. 
FIG. 7 shows another semi-autolock slider according to a second embodiment 
which is totally identical in structure with the first embodiment except 
that a substantially square locking-pawl-insertion through-hole 15 is 
located close to the possible meeting point P of opposed rows of fastener 
elements E and that, in a slope 14 which is divided into front and rear 
parts by the locking-pawl-insertion through-hole 15, the front part is 
gently sloping from the intermediate tapering portion of the central ledge 
10 to the one side recess 9 and the rear part is sloping from the 
small-width portion 13 to the one side recess 9. 
FIG. 8 shows an autolock slider according to a third embodiment to which 
the foregoing locking-pawl-insertion through-hole 15 is adopted. In this 
slider, a slider body 1 has on an upper surface of the upper wing 2 an 
accommodation chamber 26 in which a U-shape leaf spring 24 having at one 
end a locking pawl 21 is received. The chamber 26 has centrally on its 
bottom a V-shape guide surface 27 f or rotatably supporting the axle 31 of 
the pull tab 30. The chamber 26 accommodating the leaf spring 24 inside is 
concealed by a boat form cover 28. The cover 28 has in opposite sides a 
pair of laterally aligned cutouts 29 through which the axle 31 of the pull 
tab 30 is inserted. Thus the autolock slider is completed. 
In the thus assembled autolock slider, the locking pawl 21 is removed off 
the legs L of the fastener elements E (see FIG. 5) against the resilience 
of the spring 24 by pulling the pull tab 30, then the slider can slide on 
the fastener chain. Having the front and rear parts of the slope 14 
located at the front and rear sides, respectively, of the 
locking-pawl-insertion through-hole 15, it is possible to guide the legs L 
of the fastener elements E smoothly without damage such as scratch. 
FIG. 9 shows still another semi-autolock slider according to a fourth 
embodiment which is identical in structure with the foregoing embodiments 
except that the locking-pawl-insertion through-hole 15 is in the form of 
an elongated rectangular slot extending parallel to the longitudinal 
center line of the central ledge 10 and located close to the possible 
meeting point P of opposed rows of fastener elements E (see FIG. 5) and 
that the slope 14 is separated by the locking-pawl-insertion through-hole 
15 into front and rear parts each contiguous to the large-width and 
small-width portions 12, 13, respectively, of the central ledge 10 so as 
not to form any step between the central ledge 10 and the one side recess 
9. This arrangement is suitable to a slider of the type in which the 
locking pawl 21 is pivotally movable about the transverse axis. 
This locking-pawl-insertion through-hole 15 of FIG. 9 is also suitable to a 
manual-lock slider according to a fifth embodiment of FIG. 10. In this 
manual-lock slider, an attachment lug 32 stands on the upper surface of 
the upper wing 2 and rotatably supports the axle 31 of the pull tab 30. 
And the locking pawl 21 projects perpendicularly from the pull tab 30 at a 
position near the axle 31 for insertion in the locking-pawl-insertion 
through-hole 15 to pivotally and retractably project into the guide 
channel 6 as the pull tab 30 is pivotally moved about the axle 31 
transverse of the slider body 1. 
Alternatively the pull tab 2 may have at the axle 31 a non-illustrated cam 
on which a non-illustrated leaf spring mounted in the upper wing 2 would 
rest, so that the pull tab 2 can be prevented from inadvertently taking an 
upright posture; thus this arrangement may be applied also to a 
semi-autolock slider. In operation, in either type locking slider, when 
the pull tab 30 is pulled to its upright posture, then the locking pawl 21 
is removed off the legs L of the fastener elements E (see FIG. 5) to allow 
the slider to slide in either direction. To stop the slider, the pull tab 
30 is turned to its horizontal posture to bring the locking pawl 21 into 
engagement with the legs L of the fastener elements E, thereby preventing 
the slider from inadvertently moving on the fastener chain. 
In not-illustrated another alternative form, the locking-pawl-insertion 
through-hole 15 may extend from the small-width portion 13 into the one 
side recess 9 at a position off to the rear end 7. Also in this case, it 
is very important that the slope 14 should be located on either the front 
side or the rear side of the locking-pawl-insertion through-hole 15, so as 
not to form any step between the central ledge 10 and the one side recess 
9, and that the shape of the slope 14 is located at one side of the 
large-width portion 12 of the central ledge 10 or in the one side recess 
9, should be such that removing the cores from the molding templates can 
be facilitated when the slider body 1 is molded. 
With the locking slider of this invention, it is possible to obtain the 
following advantageous results: 
According to the first aspect of the invention, partly since the upper wing 
2 has on its lower surface the central ledge 10 extending from the guide 
post 4 toward the rear end 7 of the guide channel 6 and has a 
locking-pawl-insertion through-hole 15 extending from the central ledge 10 
into one of opposite side recesses 9, and partly since the slope 14 
extends along the boundary of the central ledge 10 and the one side recess 
9 across the locking-pawl-insertion through-hole 15, it is possible to 
eliminate every step on either of the front and rear s ides of the 
locking-pawl-insertion through-hole 15 so that the fastener elements E can 
slide smoothly along the entire guide channel 6, thus keeping the slider 
neat in appearance free from damage such as scratch, which would have been 
caused by a locking-pawl-insertion through-hole with a step, for repeated 
use. 
According to the second aspect of the invention, since the central ledge 10 
has the large-width portion 12 extending from the protuberance 11 around 
the base of the guide post 4 and terminating midway to the rear end 7 of 
the guide channel 6, the intermediate tapering portion contiguous to the 
large-width portion 11 and gradually decreasing in width toward and 
terminating short of the rear end 7 of the guide channel 6, and a 
small-width portion 13 contiguous to the intermediate tapering portion and 
extending to the rear end 7 of th e guide channel 6, it is possible to 
make the locking-pawl-insertion through-hole 15 in the central ledge 10 
and the side recess 9 easily and to minimize a possible frictional 
resistance of fastener elements E on the lower surface of the upper wing 2 
around the locking-pawl-insertion through-hole 15 and therefore to guide 
the fastener elements E smoothly. 
According to the third aspect of the invention, partly since the 
protuberance 11 and the central ledge 10 have a flat surface for covering 
a possible path of successive coupling heads H of opposed rows of 
filamentary fastener elements E, and partly since the slope 14 extends 
along the large-width portion 12 of the central ledge 10 forward and 
rearward of the locking-pawl-insertion through-hole 15 for covering a 
possible path of successive legs L of one row of the fastener elements E, 
it is possible to guide the coupling heads H of the filamentary fastener 
elements E on a substantially flat surface through the entire length of 
the guide channel 6 as the stepped portion at either of the front and rear 
side of the locking-pawl-insertion through-hole 15 is compensated with the 
slope 14, thus securing a smooth movement of the slider. 
According to the fourth aspect of the invention, partly since the 
locking-pawl-insertion through-hole 15 extends transversely from said 
small-width portion 13 of the central ledge 10 into the one side recess 9 
and partly since the slope 14 extends forward and rearward of the 
locking-pawl-insertion through-hole 15 and contiguously connects the one 
side recess 9 with the large-width and small-width portions 12, 13 of said 
central ledge 10, it is possible to guide the legs L of the fastener 
elements E smoothly without damage such as scratch, even though the 
locking-pawl-insertion through-hole 15 is located in the small-width 13 
portion of the central ledge 10. 
According to the fifth aspect of the invention, since the 
locking-pawl-insertion through-hole 15 is in the form of a slot extending 
longitudinally of the slider body 1 and the slope 14 extends forward and 
rearward of the locking-pawl-insertion through-hole 15, the locking pawl 
21 can easily be pivotally moved about the axis transverse of the slider 
body 1, and the fastener elements E can be guided smoothly without damage 
because of the slope 14 existing on either of the front and rear sides of 
the locking-pawl-insertion through-hole 15. 
According to the sixth aspect of the invention, since the 
locking-pawl-insertion through-hole 15 is in the form of a rectangular 
slot extending perpendicularly across the longitudinal center line of the 
central ledge 10, the locking pawl 21 can be pivotally moved about the 
axis longitudinal of the slider body 1 smoothly with maximum ease. 
According to the seventh aspect of the invention, since the 
locking-pawl-insertion through-hole 15 covers or extends close to a 
possible meeting point P of opposed rows of the successive coupling heads 
H of the fastener elements E, it is possible to insert the locking pawl 21 
into a space between adjacent legs L of the fastener elements E very 
easily even if the locking pawl 21 is large in size, thus securing a 
reliable locking function. 
According to the eighth aspect of the invention, since the locking pawl 21 
is supported on said upper wing 2 for pivotal movement about the axis 
extending longitudinally of said slider body 1, the locking pawl 21 
suitable to the locking-pawl-insertion through-hole 15 with the slope 14 
on each of its front and rear sides can be pivotally and retractably 
project into the guide channel 6, thus enabling a reliable and efficient 
locking function and a smooth movement on the fastener chain as possible 
impacts due to a locking-pawl-insertion through-hole with a step are 
absorbed. 
According to the ninth aspect of the invention, since the locking pawl 21 
is one end of a leaf spring 24 and normally projects into the guide 
channel 6 under the resiliency of the leaf spring 24, the locking pawl 21 
suitable to the locking-pawl-insertion through-hole 15 with the slope 14 
on each of its front and rear sides can be urged normally to project into 
the guide channel 6 automatically and resiliently, thus enabling a 
reliable and efficient locking function and a smooth movement on the 
fastener chain as possible impacts due to a locking-pawl-insertion 
through-hole with a step are absorbed. 
According to the tenth aspect of the invention, partly since the pull tab 
30 having at one end the transverse axle 31 is supported on the upper wing 
2 for pivotal movement about the axle 31, and partly since the pull tab 30 
has, at its one end adjacent to the axle 31, the locking pawl 21 which is 
projecting perpendicularly from the pull tab 30 and which is pivotally 
movable about the axle 31 to pivotally and retractably project into the 
guide channel 6 in response to the pivotal movement of the pull tab 30, 
the locking pawl 21 suitable to the locking-pawl-insertion through-hole 15 
with the slope 14 at each of its front and rear sides can be pivotally 
moved about the axis transverse of the slider body 1 in a manual or 
semi-automatic action, thus enabling a reliable and efficient locking 
function and smooth movement on the fastener chain as possible impacts due 
to a locking-pawl-insertion through-hole with a step are absorbed.