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Патент USA US2106129

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Jan. 18, 1938.
' Filed Feb. 4, 1955
2 Sheets-Sheet l
Jan._ 18, 1938.
Filed Feb. 4, 1935
2 Sheets-Sheet
Gideon Sundbac/k
2,106,129 " .
TENT orrica .
Gideon Snndback, Meadville, Pa., assignor to
Talon, Inc., Meadville, Pin, a corporation of
Application February 4, 1935, Serial No. 4,794
12 Claims. (Cl. 29-148)
My invention relates to the art-‘of making
fastener stringers, particularly for fasteners of
the type'having multiple series of spaced ele
ments attached along the corded edge of _a ?exi '
ble tape. A, pair of suchyfastener stringers are
usually ?tted with a slider for engaging and dis
engaging the fastener elements. -,
This application is a continuation in part of
my copending application, Serial No. 414,156,
10 ?led December 14, 1929, now Patent No. 1,992,
253, dated February 26,‘ 1935,- in which there is
disclosed a new and improved form of wire
fastener element, for the making of which my
invention is especially adapted. It is to be un
derstood, however, that the method invention
claimed in this application vis not limited to any
particular form of element since the interlock
ing construction as well as other features may
be varied in many ways.
Slide fastener stringers have been manufac
tured by various methods in most of which a ?at
metal blank is cut out with spaced clamping jaws
for attaching the element to a stringer, and with
a head at the other end. After the blank is out
it is usually placed in a suitable die and by op
eration of a reciprocating punch a projection
and recess are formed on the head end.
An important object of this invention is to
provide a slide fastener whose elements are
smooth and free from so-called tool marks and
other uneven surfaces.
the bend in a wire fastener element whether the
wire be round or square, in such'a way that the
placing of metal will not materially weaken the
fastener element at the bend. It will be under
stood that this might easily proveto be the weak
point of the fastener since the clamping effect of
the jaws depends on the strength of the element
at the bend.
My invention also contemplates a new sequence
of steps in making fastener stringers. Instead 10
of forming the elements with the desired inter
locking projections and recesses before attaching
them to the tape, the blanks are ?rst secured
?rmly to the tape in properly spaced relation,
and then the interlocking projections or recesses, 15
or both, areformed.
In this way the problem
of locating and holding the small elements while
being operated upon by punches and dies is sim
iVarious other objects and advantages of my 20
invention will appear during the following speci
?cation and will be particularly pointed out in
the claims.
In the accompanying drawings, I have shown
for purposes of illustration. two embodiments 25
which my invention may assume in practice. In
these drawings:
Figs. 1 and 2 are diiferent views .of a wire
blank used in making a fastener element from
round wire;
Fig. 3 is a plan view of a small section of
has been punched out of sheet metal, during the
fastener stringer after the wire blanks are se
cured thereto and‘before the interlocking means
operation in which the recess and projection are
In the ordinary die forming of a blank which
35 simultaneously formed, the metal swells in all
Fig. 4 is a transverse section through the 35
stringer in Fig. 3;
directions, causing uneven outer surfaces. This
is particularly true after the die vhas become
somewhat worn.
Furthermore, the original surface of a blanked
Fig. 5 is a perspective view showing diagram
matically the tools for, forming the interlocking
40 element or of one which has been ‘severed from
a formed wire may be uneven or, at least have un
matically the tools for forming the interlocking
even and sharp corners. By using the original
surfaces of a wire as the ?nished external sur
faces of the, fastener elements-I am able to
secure a smoother fastener than has been known
In my improved method the projection and
recess are formed in distinct and separate oper
ations. One advantage of this is that the entire
50 thickness of the metal is not placed under heavy
forging pressure which would cause swelling and
distortion of the outer surfaces of the fastener
Another object of theinvention is to provide
of making the'recess and projection at
Fig. 6 is an elevation view showing diagram
Fig. 7 is a longitudinal section through a small
portion of a fastener showing the construction
of a typical fastener element .formed from 45
round wire;
Fig. 8 is a transverse section through the
fastener showing the projection side of the ele
Fig. 9 is _a front view of a fastener element; 50
Fig. 10 is a plan view of a completed fastener
made in accordance with my invention with the
top portion of the slider removed to facilitate
Fig. 11 is a cross-section through the ‘die with 55
recess in two separate operations, the shape
line ll-ll of Fig. 5';
and size of the one is ‘not controlled by the
Fig. 12 is across-section through the same die
on line l2—l2 of Fig. 5;
the fastener‘element and stringer in position on
This method results in a fastener as shown
Figs. 13 and 14 are various’steps in a modified
method wherein a wire of square cross-section is
preformed and cut 011;
Fig. 15 shows the wire in cross-sectiogmwith
in Fig. 10, having interengaging recesses and
projections l6 and i1 respectively, and sloping
front end surfaces l8, whichv assist in guiding
the members into engagement with one another. '
the preforming tools diagrammatically illustrat- ' Any suitable slider may be provided for operat
10 . ,ed;
Fig. 16 is a perspective view of the preformed
wire. element ready for bending;
Fig. 1'7 shows the next step of the method
wherein the blank is bent to U-shape;
Fig. 18 shows the step of forming the recess
and also the step of forming the projection;
Figs. 19 and 20 show the following step of form-I,
ing the fastener. The one illustrated comprises 10
opposing wings 28 united to a wedge-shaped
neck 28 and operated by a pull tab 30.
In the modi?ed method shown in Sheet 2 of
the drawings a di?erent shape of raw mate
rial is used in forming the fastener members. 15
The formation of the U-shaped projection at the
bend in such a way as not to diminish the
[strength materially, is however, common to both
- ing the clamping jaws;
Fig. 21 shows the step of spreading the jaws
Fig. 22 shows the last step of. closing the jaws
2,0 and
on‘ the beaded edge of a tape; and
Fig. 23 is a view of a slide fastener made ac-.
In the second method’ I start with a wire 3|
of square cross-section, it being understood that
the corners‘ will have a substantial radius in
order that they will be smooth‘ to the touch.
._A section of this shape may readily be formed.
‘Referring to Figs. 1 and 2, a blank II is cut by extruding ‘or by simple rolling operations.
The ?rst steps are the cutting of the wire into
from a piece of round wire and formed with suit
cording to the second embodiment of the inven
able means such as indentations l2 adjacent the
ends of the blank to engage around the corded
edge of the tape when the member is clamped “to
the stringer. In ‘this’ form the wire blanks may
be tumbled to remove all burrs and hoppered
individual lengths and the‘ preforming ofthe ,
wire to provide recesses '32 having an unsym
metrical shape, as illustrated.v ‘This preformlng
mayibe done. before cutting .of the blanks or 30
afterwards, by suitable reciprocating tools, such
by any suitable mechanism such as described in » as illustrated at .33 and 30 or by rotary die my Patent No. 1,653,320. The indentations I! members. These recesses are formed so as to
may, if desired, be formedsat some latter stage
-35 of production such as described in said patent.
extend across one corner of the wire section and
the forming ofthese recesses leaves a portion 35
step comprises bending the wire blank around.
.of metal 36 in the middle which has been some
what enlarged during the forming of the re
'the corded edge 20 of a stringer 2| and thus
securing the blanks ?rmly tov the stringer in the
ment into the'shape shown in Fig. 17, the por
During this operation it will be understood that
one leg ll of the bent member thicker than the'
may be‘ advanced intermittently between recipro
cating die parts 22, 23. The ‘tools 22 are shaped
so as to hold the blank'?rmly while the tools 23
out the recesses 38, 39 are, of course, slightly 50
o? center with respect to the fastener element.
The punch and die are indicated at ‘2, 43. This
punching out operation leaves the surfaces on
the inside of the legs 40 and ll )very rough
In this embodiment of the invention the next
After bending‘ of this preformed ele
proper spaced relation for the ?nishedfastener ‘tionof metal" is leftv at the bend and can be utilized for forming the projection. The form
elements. The, member in this form comprises
U-shaped element. with clamping sides or legs _ ing of the projection and recess is indicated in
l3, l1 and a bend l5. It is now necessary to form Fig.18, and is'carried out by suitable forming
the interlocking projection and recess at the tools 36, 31, which act similarly to the form
ing tools 21. 24 respectively in the ?rst method.
45 bend II. There stepsmay occur simultaneous
The next step as illustrated in Fig. 19, com
or either may precede the other.
Fig. 5 illustrates the forming of the recess. prises punching out the- recesses 38, 39 leaving
' the tape 2| with its attached U-shaped blanks‘ other leg ‘I. *‘ The'punch and die which cut
are shaped to/support the blank during forming
and to form the inclined'surfaces or indentations
N. The recess is formed by a ‘suitable punch 24 with burred “edges which tend‘ to make the legs 65
having a forming end 25 which moves into the _ more securely grip the corded edge-of the tape
when clamped thereto, holding the fastener
members in place, thus eliminating any danger
. cent elements on the stringer. By reason of this’
kind of movement the material which is displaced. of the members slipping out of place along the
to form the recess It, moves inwardly toward the corded edge. It is now necessary to spread
inside of the bend as seen in Fig. '7 whereby the these legs or at least one of them before plac
ing the" members on‘ the cordededge of the
resulting structure is not weakened. _
The forming of the interlocking projection is tape. In the spreading operation, preferably
'shown in Fig. 6. The side operating tools 28 and - only the leg 40 is bent as shown in Fig. 21. The
and 26a enter: between the‘ blanks along the ?nal step comprises ' closing of this leg 43 65
stringer and support each of the elements in around the corded edge of the tape 2| by any
turn while the projection is being formed.’ The suitable tools, one of which is illustrated at M.
tool for forming the projection is indicated by It has .a somewhat different appearance from
blank at an acute angle between a pair of adja
. the numeral 21 and is provided with a suitable
70 forming edge which pushes downwardly the ma
terial on the outer front surface of the blank
ps0 as to form “a projection l'l. 'Only a small
amount of material need 'be moved in this oper
the fastener of Fig. 10 in- that the sides will.
be ?at and smooth. All rough corners and-burrs. 70
however, can be removed by tumbling of the.
members ‘either in the form shown in Fig. 16 or
a Fig. 17.
In this fastener the preforming of the e
ation?so that, the resulting ‘member is ‘not mate wire leaves side sloping surfaces 43 which make
rially weakened. By forming the projection and the fastener more easily ?exible without becom
rs .
ing disengaged. The slider for operating this
fastener is indicated by the numeral 46. .
ing a piece of material from original uniform. - '
cross-‘section to concentrate material at the cen-'
tral portion of said‘ piece of material, bending
While I have specifically shown and described
said piece of material to U-shape with said eon
in this application two embodiments which my
invention may assume in practice, it will be un
centrated portion at the bend,‘ the legs of said 5 .
derstood that these embodiments are merely for U-shaped member constituting means for em-.
the purposes of illustration and descriptiojisand ‘bracing and'clamping the edge of a stringer, and
that various other forms may be devised within I deforming material at said bend after the bend-'
ing operation to provide an interlocking projec
the scope of my invention as de?ned in the fol
10, lowing claims.
What I claim as my invention is:
l. The method of making fastener elements
comprising forming attaching means on each
tion and recess.
8.‘ The method of making a fastener element
for attachment to a ?exible stringer in the manu
facture of slide fasteners, which comprises forg
fastener member for securing it to a tape, a por- . ing a uniform piece of material from" uniform
15 tion of the member being adapted to project
cross-section to concentrate material at the cen- 15
beyond the attaching means, punching out a re
tral portion thereof “and to provide indentations
cess in one side of such projecting portion of said
member, and deforming material from an outer
on opposite sides of said enlarged portion, bend
ing said piece of material to U-shape with said
enlarged portion at the bend, the legs of said
U-shape member constituting means for embrac- 20
ing and clamping the edge of a stringer, and de
surface of said member to provide a projection
opposite said recess.
2. The method of making a fastener‘ element
forming material at said bend after the bending
operation to provide an interlocking projection
comprising forming a clamping portion adjacent
one end of the element, providing interlocking
means at the other end by steps including punch-a
on one side and an interlocking recess on the
25 ing out a recess on one side of said element with
opposite side.
facture of slide fasteners, which comprises forg
ing a uniform piece of material from uniform
cross-section to concentrate material at the cen- 3°
tral portion thereof and to provide indentations _
‘ on opposite sides of said enlarged portion, bend
forming material from adjacent the vbend toward
said clamping portions to form a recess, and form-i
35 ing an interlocking projection, on the bend of
said wire.
ing said piece of material to U-shape with said
enlarged portion at the bend, forming recesses‘ '
in the'opposed faces of the leg portions of said
bent member to provide means for engaging the
comprising bending a piece of substantially round
beaded edge of a ?exible stringer.
10. The combination de?ned in claim 10 with
wire to form parallel side portions and a con
the further step of spreading said legs apart to
4. The method of'making a fastener element
for attachment to a ?exible stringer in the manu
tion toward the clamping portion?
3. The method “of making a fastener elemen
comprising bending a piece of wire to form clamp
ing portions between the ends of the wire, de
9. The method of making a fastener element
a punch moving at an acute angle to the plane
of said element so as to deform the material from
said recess in the plane of said element in a direc
necting portion at the bend, deforming material, facilitate assembly with the beaded edge of the 40
wholly from the outer side of said bend on then
?exible stringer.
'11. The combination de?ned in claim 10 where
side ‘of said connecting-portion, and punching in the recess in one of said leg portions is deeper
’ out a recess wholly in the other side of said , than the opposite recess to make one leg weaker
front of said element to form a' projection on one ’
45 connecting portion.
5. The. method of making a fastener stringer
against bending stresses than the opposite leg.
12. The method of making fastener elements
for attachment to a ?exible stringer in the
manufacture of, slide fasteners which comprises
of a piece of material, and deforming the mate- ' forging a piece of material of generally square
50 rial of each of said blanks while so ‘attached to cross-section tov provide an enlarged portion at 50'
the middle with material concentrated along one
form interlocking projections and recesses.
16. The method of making fastener stringers corner of said piece of material, and to_ form in
dentations extending across the same corner, and
for slide fasteners which comprises securing fas
tener member blanks to said stringers along the the opposite sides of said enlarged portion, bend
-55 adjacent edges thereof, said blanks being of the ing said piece of material to U—sha'pe in such‘a 65
approximate size and shape of the ?nished fas-_ way that-the parallel legs of the bent member
tener element and having the same spacing as the‘ have ?at faces opposite each other and with said
elements of a ?nished fastener, and then operat— enlarged portion at the bend, and then forging
ing on the projecting portions of each of said the material at said enlarged portion to provide ‘
60 blanks to complete the formation of interlocking an interlocking projection on one side of the 50
which comprises cutting a plurality of blanks,‘
attaching ‘them in spaced relation to the edge
projections and recesses.
7. The method of making a fastener element
for attachment to 'a ?exible stringer in- the manui
'facture of slide fasteners, which comprises forg
member and forming an interlocking recess on
the opposite side of said member.
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