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Патент USA US3082734

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March 26, 1963
3,082,724
J. M. wAsHBuRN
STITCH FORMATION
Filed Dec. 29, 1958
2 Sheets-Sheet 1
fnvení?or:
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John/MWìLsh/burn
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#5M
His At orne'ys
March 26, 1963
3,082,724
J. M. wAsHBURN
STITCH FORMATION
Filed Deo. 29, 1958
2 Sheets-Sheet 2
In ven/tor:
JohnM Washburn,
133,7/
United States Patent Office
3,082,724
Patented Mar. 26, 1963
2
l
wardly a sufficient distance to bring the bight of loop 6
into registering paired relationship with the bight of a
3,082,724
STITCH FORMATION
loop 4. A straight run of thread 2, as 6', extends next
to run 4’ of thread 1 and from one penetration point 5
_
John M. Washburn, West Hartford, Coun., asslgnor t0
The Morrow Machine Company, Hartford, Conn., a
corporation of Connecticut
Filed Dec. 29, 1958, Ser. No. 783,397
5 Claims. (Cl. 112-269)
' to another.
A third continuous thread 3, comprising a covering
or locking thread, is formed into a series of loops 12 and
runs 12’. Each loop 12 is looped through the bights of
a registering pair of loops 4 and 6 of threads 1 and 2
This invention relates to stitch formation, and more
particularly to an improved form of three thread over 10 respectively and from this point extends obliquely over
the upper surface of work material to the anchorage or
edge stitch particularly .adapted to join work material
penetration point 5 of the next succeeding registering
edges either when the plies of material are in superim
pair of loops 4 and 6 where the bight of loop 12 extends
posed relation or in a relationship that is established when
around the bases or ends of adjacent loops 4 and 6 to
superimposed plies of material with the stitching applied
thereto are opened or hinged into a relationship wherein 15 maintain runs 6’ of needle thread 2 in close relationship
with runs 4’ of needle thread 1.
the fabric edges become what is commonly designated
When the previously superimposed plies of work ma
an abutted seam.
terial M1 and M2 are opened as a hinge into abutted
relation as shown in FIG. 2 it is seen that loops 4 of
overedge stitch for joining work material, the stitch being
effective to maintain plies of material in abutted relation 20 thread 1 extend on the under side of the material directly
from penetration points 5 in material M1 to penetration
ship even if one of the needle threads is broken.
points S’ in material M2. Runs 4’ of thread 1 are
Other objects and advantages of the invention will
on the upper surface of work material M1. Also it is
become apparent by reference to the following specifica
A primary object of the invention is to provide an
tion taken in conjunction with the accompanying draw
ings.
seen that the penetration points 10, 10’ for loops 6 of
25 thread 2 are, in respect to each ply of work material M1
In the drawings:
FIG. l is a perspective view showing a partially com
pleted seam to which stitching has been applied in accord
ance with the invention; and
FIG. 2 is a perspective view showing the stitch of the 30
present invention with work pieces abutted.
The stitch 0f the present invention is formed from
three continuous threads: needle threads 1 and 2 and
covering thread 3. The threads 1, 2 and 3 may be formed
into the seam by a two needle Merrow overedge sewing 35
and M2, laterally offset outside the alignment of penetra
tion points 5, 5’ respectively »for loops 4 of thread 1.
Loops 12 of thread 3 with their bights anchored .at pene
tration points 5, extend on the upper surface of both
plies of work material and thence through registering
bights of loops 4 and 6 included in a preceding unit of
stitch formation. Inasmuch as the bight of loop 6 is
anchored in its registering relationship with a bight of a
respective loop 4 the position of penetration 10' in work
material M2 becomes offset from the line of runs 12’
of loops 12. This offset of penetration points 10’ in
material M2 is permitted by excess thread provided when
the loops 6 are extended through the fabric plies when
they are iu superimposed relation.
by the loopers of the machine. To form a seam joining
Because of the above described relationship, if either
work material along an abutted edge, the work material 40
needle thread 1 or Z is broken, the other thread will
is positioned, as shown in FIG. l, in two plies M1 and
machine of the type manufactured by the assignee of this
application; threads 1 and 2 being placed by the needles
of the machine and covering thread 3 being manipulated
M2 which are superimposed upon each other with the
edges to be joined in vertical alignment. Needle thread
1 is formed into a series of fabric penetrating loops such
as 4, connected in series by runs such 4as 4’. Each loop
4 extends from its open end or base at a penetration point
hold the seam with the edges of plies M1 and M2 main
tained in abutment.
The foregoing description is to be considered exem
plary rather than limiting and the true scope of the in
vention is that defined by the following claims.
I claim:
5 through the fabric, thence along the under surface of
1. An overedge chain stitch seam comprising a pair` of
the fabric to a point beyond the fabric edge and thence
upwardly to locate the closed end or bight o-f the loop 50 continuous needle threads for-med into two series of loops
penetrating a piece of fabric at different distances from
adjacent the aligned edges ysubstantially in a plane coin
one edge of the fabric and having portions extending be
cident with that of the upper surface of the work material.
yond said edge, and a covering thread formed into a corre
Penetration points 5 lie along a line which is generally
sponding series of loops interlooped with the loops of said
parallel to the edge of the work material, the line of
needle threads yby extending through said portions of the
penetrations being spaced from the edge of the fabric
loops of both needle threads and about adjacent loops of
by a ñxed distance.
both needle threads at the points where the series of loops
As will more clearly be apparent, the arrangement of
threads at these points 5 of fabric penetration serves as
an anchorage. A loop of needle thread 1 starts from
of that one of said needle threads closest to said edge
penetrate the fabric.
2. An overedge chain stitch seam comprising a first
a point of .anchorage 5 and extends directly through the
60 continuous needle thread formed into a ñrst series of loops
Worn material, `but a loop of needle thread 2, as loop 6,
has its open end or base located at a penetration point
5 and passes from there along the upper surface of the
work material to a fabric penetration point as 10. These
penetrating a piece of fabric at spaced points lying along
a ñrst line spaced inwardly from an edge of said fabric,
a second continuous needle thread formed into a second
series of loops passing through said fabric at spaced points
penetration points 10 are laterally aligned with pene 65 lying along a second line located between said edge and
tration points 5, since the thread placing needles of the
said first line, both of said series of loops having bight
two needle overedge machine are parallel to each other,
portion-s projecting from one surface of said fabric, the
and lie along a line parallel to the line of penetration
bight portions of each loop of said ñrst series being lo
points 5 but at a greater distance from the edge of the
cated adjacent the bight portions of a loop of said second
work material. Each loop 6 emerges from a fabric pene
series, and a continuous covering thread »formed into a
tration 10 and continues along the under surface of the
fabric to a point beyond the fabric edge ,and thence up
third series of loops, each loop of said third series being
looped through adjacent bight portions of loops of said
3,082,724
3
iirst and said second series and having bight portions
looped around adjacent loops of said first and said second
series on the opposed surface of said fabric at points of
fabric penetration lying on said second line.
3. An overedge chain stitch seam comprising a first
continuous needle thread formed into a ñrst series of
fabric penetrating loops connected by runs of said first
thread lying on one surface of a piece of fabric in gen
erally parallel spaced relationship with an edge of said
4
other series extend through the fabric, said covering
thread comprising a series of loops with each loop looped
through adjacent loops respectively of the two needle
threads at a point adjacent the fabric edge, each loop of
said covering thread having a bight portion looped about
adjacent loops respectively of the two needle threads at a
point in the line of needle penetrations nearer the fabric
edge.
5. An overedge seam for joining portions of work ma
fabric, each loop of said first series extending from be 10 terial along a line Where two sections of material are in
tween adjacent runs of said first thread away from said
abutted relaitonship, the seam being formed from two
edge and through said fabric at a penetration point and
continuous needle threads and a continuous covering
having a bight portion projecting from the opposite sur
thread, said .threads being interlooped with each other in
face of said fabric at said penetration point and beyond
regular succession adjacent the abutment line, each of the
said edge, a second continuous needle thread formed into 15 needle threads being formed into a series of loops with
a second series of fabric penetrating loops connected by
each loop of one series extending through the fabric on
run-s of said second thread lying on said one surface of
opposite sides of the line of abutment at respective points
said piece of fabric contiguous to and substantially co-ex
of needle penetration spaced respectively further from the
tensive with said runs of said lirst thread, each loop of
line of abutment than corresponding points of needle
said second series passing through said fabric at a penetra 20 penetration of the other series of loops, said covering
tion point located between adjacent runs of said ñrst
thread comprising a series of loops with each loop looped
thread and having a bight portion projecting yfrom said
through adjacent loops respectively of the two needle
opposite surface of said fabric beyond said edge into ad
threads at a point on one side of the line of abutment
jacent relationship with the bight portion of the adjacent
and having a lbight portion looped about adjacent loops
loop of said first series, and a continuous covering thread 25 respectively of the two needle threads at a point in the
formed into a third series of loops, each loop of said third
series extending through the bight portions of adjacent
loops of said first and said second series and across said
one surface of said fabric beneath next adjacent runs and
around the loops of said `first and said second series con 30
nected between next adjacent runs.
4. An overedge seam for-med `from two continuous
needle threads and a continuous covering thread, said
threads being interlooped With each other in regular suc
cession adjacent one edge of a piece of fabric, each of 35
said needle threads being `formed into a series of loops
with the loops of one series extending through the fabric
at points of penetration spaced further from Vthe fabric
edge than points of penetration where the loops of the
line of needle penetrations nearer the line of abutment.
References Cited in the tile of this patent
UNITED STATES PATENTS
811,789
875,594
Onderdonk ___________ __ Feb. 6, 1906
Onderdonk __________ __ Dec. 3l, 1907
2,787,233
2,903,872
2,980,917
Walling ______________ __ Apr. 2, 1957
Ledwell ____________ __ Sept. 15, 1959
Slane _______________ __ Apr. 25, 1961
OTHER REFERENCES
‘Federal Standard Stock Catalogue, Section lV, Part 5,
March 4, 1930.
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