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Патент USA US3070874

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Jan. l, 1963
3,070,864
J. P. PFEFFER
SLIDER FOR SLIDE FASTENER
'Filed Aug. l5. 1960
#6.1
-
H622.
Q_ g
3,676,364
United States Patent Utilice
Patented Jan. l, 1%@3
2
1
will be avoided as a result of the ease with which the
3,070,864
SLÈDER FOR SLIDE FASTENER
Josef P. Pfeffer, Vienna, Austria, assignor to
Zeizer & Co., Vienna, Austria
Fries Ang. 1s, 1960, ser. No. 49,495
Claimsl priority, application Austria Aug. 22, 1959
8 Claims. (Ci. 24--201)
opening and closing motion of the slide is performed.
According to another feature of the invention, a par
ticularly practical embodiment can be obtained by the
fact that the two guide channels converging at an acute
angle on the one hand and the guide channel in which
the profilated borders engage _or disengage or are closed
on the other hand, are of approximately constant height
each. The difference in height thus produced is elimi
The invention relates to a slide for a slide fastener
of plastic, e.g. thermoplastic material, comprising a pro 10 nated by a step- on each side or by progressive transition
filated border of a clutch strip engaging a corresponding
ly prolilated border of a counter-clutch strip, the clutch
in the area of convergence of the channels. rïhis slide
is comparatively easy to produce because the cores are
strips engaging and disengaging essentially in parallel
of simple formation.
relation to the principal plane of the slide fastener. In
channel of the closed profilated borders will be com
paratively large because its size is the same as that of
the element on which the opening and closing motion is
performed and in which a larger clearance must there
a manner known per se, said slide comprises a guide chan
nel for each of the protilated borders converging at an
acute angle to form a single guide channel in which the
proñlated borders are engaged or disengaged or closed.
in slides of conventional design the proiilated borders
are closed in such a way that at least one of the proñlated
borders is opened by means of an auxiliary device to
such an extent Ithat the counter-proiilated border can be
easily inserted, whereupon ‘both protilated borders are en
cased and closed again. For the purpose of expanding
the profilated borders the interior of conventional slides
The cross-section for the guide
fore be provided in perpendicular relation to the plane
of the slide fastener. According to another feature of
the invention, the cross-section of the guide channel por
tion for the closed prolilated borders may be only slightly
larger than the cross-section of the closed profilated
borders themselves, which offers the advantage of corn
pressing `and securing the closed profilated borders addi
tionally by means of theslide.
presents wedge-formed elements or keyways or else the
two guide channels converging at an acute angle are so
shaped at their very entrance that one of the profilated
borders or both enter the slide in opened condition al
located on both sides of the slotted openings for the
ready. The disadvantage of the conventional slides of
this type resides in the fact that the slides are hard to
pull or push and lthe profìlated- borders are frequently
Thus the friction surfaces, already considerably reduced
damaged as a result of which the slide fastener becomes
In a further embodiment of the invention, on each
narrow side of the slide one of the two lateral surfaces
fastening webs of the clutch strips is slightly protruding
inwardly as compared with the other lateral surface.
as compared with slides of conventional design, are
reduced to the very minimum. The lateral slotted open
ings for the fastening webs of the clutch strips can be
unserviceable.
The basic idea of the invention is the realization that 35 made to taper off in the direction of the exit of the closed
profiles in order to correspond to the comparatively large
the difficulty is not due to an inevitably large amount
clearance of the separate profilated borders. The height
of friction between the slide `and the profilated borders
of the slotted openings `should be such that in any posi
but that principally, the opening and closing of the pro
tion within the clearance provided, the profilated borders
filated borders by the slide produces substantia-l resist
ance. In fact, not only is an effort required to open and 40 pass freely through the slots, thereby eliminating addi
tional friction in that place.
close the profiles, but a considerable amount of friction
ln the case of profilated borders having identical cross
is caused by the opening and closing operation due to the
sections and two legs of different length with hooked lugs
sizeable pressure applied.
facing each other it is preferable to have the inwardly
According to the invention it is proposed to encompass
the profilated borders in their normal position loosely 45 protruding lateral guide surfaces engage the longer legs
by means of the guide chanels convenging at an acute
angle and providing sufficient clearance in the area of
convergence in perpendicular relation to the central plane
of the slide fastener, so that the proiilated borders are
free'to perform the closing operation and in particular, the
of the profiles.
Thus the shorter legs which are en
compassed by the longer legs are kept sufficiently far
away from the outer guide surfaces so that this en
compassing action is easily possible without additional
50 friction being produced in the area of convergence of
preceding opening motion. In accordance with the basic
idea thus put into practice the two profilated borders in
the two guide channels.
A further reduction of friction is achieved according
side the slide `are essentially moved in relation to each
to the invention by tapering the lateral slotted openings
other in their normal position only and in approximately 55 for the fastening webs of the clutch strips off in the di
parallel relation to the principal plane of the slide fast
rection of the exit of the closed profiles. In this manner
ener. In the area of convergence of the two guide chan
a dragging Contact between the fastening webs and
nels where the proñlated borders are opened and closed,
the slide is avoided at -least in the area of the separate
the two protilated borders are merely pressed against
each other, sufficient clearance being provided in per
pendicular relation to the plane of the slide fastener, so
that the reciprocal opening of the profilated legs can
proceed unimpeded, the profiles being opened to such
an extent only that introduction is possible and be
sides, no additional frictional forces are produced be
cause the profilated borders are compressed inwardly
from the `outside in the plane of the slide fastener only,
for which only minor forces are required. Practical tests
performed with such a slide go to show that the open
guide channels in spite of the comparatively large free
motion of the profilated borders in the guide channels.
According to a further feature of the invention the
manufacture of the slide is facilitated by the fact that the
slide is split lin the area of the lateral slotted openings
,for the fastening webs of the clutch strip, the tongue
located between the two guide channels converging at an
acute angle constituting the connection between the two
slide elements. In that case, the shape of the slide may
be designed regardless of the removal of the cores during
ing and closing of the slide requires a negligible effort 70 the production process, the manufacturer being absolutely
only so that the slide can easily be moved with two
free to design the guide channels as he may deem con
fingers. Obviously also, damage to the profilated borders
venient. Eg. it will thus be possible to provide cross
envases
3
sections for the guide channels inside the slide which are
larger than the apertures.
Further details of the invention will appear from the
following description of an embodiment of the invention
with reference to the accompanying drawing in which
FÉGURE 1 is a plan view of a slide according to the
invention,
4
from the scope of the invention as hereinafter defined in
the appended claims.
»
Having thus described my invention, I claim:
1. A 'slider in combination with a pair of elongated
slide fastener members formed from llexible material and
having each a strip portion and an interlocking portion
extending along one longitudinal edge of the strip portion
FIGURE 2 is a longitudinal section thereof,
FIGURE 3 is a front view,
FÍGURE 4 is a side elevation,
FIGURE 5 is a section on line 5--5 of FIGURE 1,
FIGURE 6 is a section on line 6_5 of FIG. 1, and
FIGURE 7 is a section on line 7-7 of IG. l.
and having a thickness greater than that of said strip por
tion `and including each a pair of legs extending substan
tially parallel to said strip portions and formed with inter
locking projections adapted; to engage with and disengage
from each other by moving the slider longitudinally along
the slide fastener members so as to move the latter sub
The slide comprises essentially a base-plate ì and a
stantially in the plane of said strip portions toward and
cover-plate 2, maintained in `spaced relation to each other 15 away from each other whereby during engagement and
by a connecting member 3 of tear-shaped cross-section.
disengagement the legs of said members will resiliently
A positive connection is provided lby a lug e of trape
spread, said slider comprising, a pair of substantially
zoidal shape which may be wedged in the base-plate or
parallel slider plates extending spaced from each other
otherwise attached to the latter. The base-plate 1, the
and decreasing in width toward one end of said slider; a
cover plate 2 and the connecting member 3 combined with 20 pair of flanges extending respectively along longitudinal
the side flanks 5, 6, 7 and S constitute the guide channels
edges of each plate and projecting therefrom toward but
9 and lil for the two protilated borders 11 and 12 to be
lshort of the llanges of the other plate so that opposite
united. The guide channels 9 and 10 converge to form
flanges on said plates form elongated slots between them
a single guide channel 13 whose extremity 13’ presents
selves for passage of the strip portions of said slide fas
a constant cross-section. The two guide ch-annels 9 and
it) each present a constant cross-section although they
are located at somewhat different levels. The single
guide channel 13 of larger cross-section is formed by the
tener mem-bers therethrough, each of said flanges having
an inner face substantially normal to an inner surface
of the respective plate; `and a wedge-shaped connecting
member connecting said slider plates in the region of the
other end of said slider and having a pair of wedge faces
The diffe-rence of level between 30 each extending between opposite ends of said connecting
flat bottom or cover surfaces of the two guide channels
9 and 16 respectively.
the `bottom surface of the guide channel 9 on the one
hand and the cover surface of the guide channel 10 on
member and substantially normal to and from one to
the `other of said inner surfaces of said plates and ap
the other hand, is overcome by steps 14 and 15 respec
proaching each other toward said one end of said slider
tively. The Hanks 5 and 7 form an elongated slot-116 for
and including an acute angle between themselves so as
the passage of the fastening webs 12, whereas the side 35 to form respectively together with `said inner surfaces of
flanks 6 and 8 form an elongated slot 17 for the passage
said plates and said inner faces of said llanges a pair of
of the fastening webs i2’.
diverging channels meeting a single channel formed by
The prolllated borders l1 ‘and l1’ are located inside
said inner surfaces of said plates and said inner faces of
the guide channels 9` and @ttt in their normal position as
said flanges and extending fro-m said connecting member
shown in the drawing, with ample clearance »on all sides 40 to `said one end of said slider, said single channel having
except for the side face lâ which is guided by the side
at least in the region of the junction with said diverging
flank 8 and the side face 18’ guided by the side flank S.
channels a height considerably greater than the combined
The continuation of the side faces 18 and 13’ is formed
thickness of said interlocking portions of said slide fas
by the long legs i9, 19’ of the prolilated borders. The
tener members to provide ample clearance for the spread
short legs Ztl, 20’ of the protllated borders 11, 11’ are ar
ing yof said legs yduring engagement and disengagement of
45
said slide fastener members.
ranged in spaced relation to the side flanks 5 and 7 respec
tively, so that they can be seized from behind by the
2. A slider in combination with a pair of elongated
longer legs of the proñlated counter-strip. For this pur
slide fastener members formed from flexible material and
pose, the side llanks 5 and 8 slightly protrude inwardly as
having each a strip portion and an interlocking portion
against the side flanks ’7 and 6 respectively, said protrusion
extending along one longitudinal edge of the strip portion
increasing steadily toward the guide channel for the closed 50 and having a thickness greater than that of said strip por
tion and including each a pair of legs extending substan
cross-section, eg. in a linear direction vas shown in FIG
URE 1.
tially parallel -to said strip portions and formed with inter
locking projections adapted to engage with and disen
Íilated borders are in their normal position moved essen
gage from each other by moving the slider longitudinally
tially in about parallel relation to the principal plane of 55 along the slide fastener members so as to move the latter
substantially in the plane of said strip portions ‘toward
the slide` fastener, coming `into contact with each other
at the end of the connecting member 3. As the slide
and away from each other whereby during engagement
moves farther along, both proñles are further compressed
and disengagement the legs of said members will resilient
against each other in parallel relation to the principal 60 ly spread, said slider comprising, a pair of substantially
parallel slider plates extending spaced from each other
plane of the slide fastener, the legs spreading to such an
During Lthe closing motion of the slide the two pro
extent that the short legs enter the mouth of the respec
tive profllated counter strip, as shown in FIG. 7, and the
long legs can overlap the short ones. Finally, during
passage of the proillated strips through the portion 13' of
the guide channel 13», they will assume the fully engaged
position as shown in FIG. 6. Since the cross-section of
the guide channel f3 is sull‘iciently large, a very slight
and decreasing in width toward one end of said slider; a
pair of flanges extending respectively along longitudinal
edges of each plate and projecting therefrom toward but
short of the flanges of the other plate so that opposite
flanges on said plates form elongated slots between them
selves for passage of the strip portions of said slide
fastener members therethrough, each of said llanges hav
effort is needed to open the legs.
Practically only the fric
ing an inner face substantially normal to an inner sur
tion at the side flanks 5 and S has to be overcome.
70 face of the respective plate; and a wedge-shaped con
The cover-plate 2 presents a bow 2l to which a holding
necting member connecting said slider plates in the region
clip or the like can be attached.
of the other end of said slider and having a pair of wedge
Obviously the invention is capable of other embodi
ments than that herein shown and described and its various
details are capable of modification, all without departing
faces extending between and substantially normal to said
inner surfaces of said plates and approaching each other
toward said one end of said slider and including an acute
3,070,864
angle between themselves so as to form respectively to
gether with said inner surfaces of said plates and said
inner faces of said flanges a pair of diverging channels
meeting a single channel formed by said inner surfaces of
said plates and said inner faces of said ñanges and ex
tending from said connecting member to said one end of
6
4. A slider in combination with a pair of elongated
slide fastener members formed from flexible material
and having each a strip portion and an interlocking por
tion extending along one longitudinal edge of the strip
portion and having a thickness greater than that of said
strip portion and including each a pair of legs extend
said slider, said inner plate surfaces being spaced in the
ing substantially parallel to said strip portions and formed
region of said single channel from each other a distance
considerably greater than the combined thickness of said
with interlocking projections adapted to engage with and
disengage from each other by moving the slider longitu
interlocking portions to provide ample clearance for the
spreading of said legs during engagement and disengage
the latter substantially in the plane of said strip portions
dinally along the slide fastener members so as to move
toward and away from each other whereby during en
ment of said slide fastener members and the inner plate
gagement and disengagement the legs of said members
surfaces in one of said diverging channels being offset in
will resiliently spread, said slider comprising, a pair of
direction substantially normal to said surfaces with re
spect to the inner plate surfaces of the other diverging 15 substantially parallel slider plates extending spaced from
each other and decreasing in width toward one end of
channel and the opposite inner plate surfaces in said
said slider; a pair of flanges extending respectively along
diverging channels being spaced from each other a dis
longitudinal edges of each plate and projecting there
tance smaller than the distance between said inner plate
from toward but short of the ñanges of the other plate
surfaces in said single channel.
so that opposite lianges on said plates form elongated
3. A slider in combination with a pair of elongated
slots between themselves for passage of the strip portions
slide fastener members formed from flexible material
of said slide fastener members therethrough, each of
and having each a strip portion and an interlocking por
said ñanges having an inner face substantially normal
tion extending along one longitudinal edge of the strip
to an inner surface of the respective plate, each of said
portion and having a thickness greater than that of said
strip portion and including each a pair of legs extending 25 flanges having a free edge face and the edge faces on
the pair of ñanges on one plate facing respectively the
substantially parallel to said strip portions and formed
with interlocking projections adapted to engage with and
free edge faces of the pair of iianges on the other plate
disengage from each other by moving the slider longi
and the distance between said facing edge faces increas
tudinally along the slide fastener members so as to move
ing from said one toward the other end of said slider;
the latter substantially in the plane of said strip portions 30 and a wedge-shaped connecting member connecting said
toward and away from each other whereby during engage
slider plates in the region of the other end of said slider
ment and disengagement the legs of said members will
and having a pair of wedge faces each extending be
resiliently spread, said slider comprising, a pair of sub
tween opposite ends of said connecting member and sub
stantially parallel slider plates extending spaced from
stantially normal to and from one to the other of said
each other and decreasing in width toward one end of said 35 inner surfaces of said plates and approaching each other
slider; a pair of flanges extending respectively along longi
toward said one end of slider and including an acute an
tudinal edges of each plate and projecting therefrom to
gle between themselves so as to form respectively to
ward but short of the iianges of the other plate so that
-gether with said inner surfaces of said plates and said
opposite flanges on said plates form elongated slots be
inner faces of said flanges a pair of diverging channels
tween themselves for passage of the strip portions of said 40 meeting a single channel formed by said inner surfaces
slide fastener members therethrough, each of said iianges
of said plates and said inner faces of said ñanges and
having an inner face substantially normal to an inner sur
extending from said connecting member to said one end
face of the respective plate; and a wedge-shaped connect
of said slider, said single channel having at least in the
ing member connecting said slider plates in the region
region of the junction with said diverging channels a
of the other end of said slider and having a pair of wedge 45 height considerably greater than the combined thickness
-faces extending between and substantially normal to said
of said interlocking portions of said slide fastener mem
inner surfaces of said plates and approaching each other
bers to provide ample clearance for the spreading of said
toward »said one end of said slider and including an acute
legs during engagement and disengagement of said slide
angle between themselves so as to form respectively to
fastener members.
gether with said inner surfaces of said plates and said 50
5. A slider in combination with a pair of elongated
inner faces of said ñanges a pair of diverging channels
slide fastener members formed from ñexible material and
meeting a single channel formed by said inner surfaces
having each a strip portion and an interlocking portion
of said plates and said inner faces of said flanges and eX
extending along one longitudinal edge of the strip portion
tending from said connecting member to said one end of
an-d having a thickness greater than that of said strip por
said slider, said inner plate surfaces being spaced in the
tion and including each a pair of legs extending substan
region of said single channel from each other a distance
tially parallel to said strip portions and formed with inter
considerably greater than the combined thickness of said
locking projections adapted to engage with and disengage
interlocking portions to provide ample clearance for the
from each other by moving the slider longitudinally along
spreading of said legs during engagement and disengage
the slide yfastener members so as to 4move the latter sub
ment of said slide fastener members, the upper of said 60 stantially in the plane of said strip portions toward and
inner plate surfaces in one of said diverging channels be
away from each other whereby during engagement and
ing located in one plane with the upper inner plate sur
disengagement the ‘legs of said members will resiliently
face in said single channel and the lower inner plate sur
spread, said slider comprising, a pair of substantially par
face in said one diverging channel being offset with re
allel slider plates extending spaced from each other and
spect to the plane of the lower inner plate surface in said 65 decreasing in width toward one end of said slider; a pair
of flanges extending respectively along longitudinal edges
single channel and meeting said lower inner surface in
of each plate and projecting therefrom toward but short
said single channel along an inclined surface portion, and
of the dianges of the other plate so that opposite flanges
the lower of said inner plate surfaces in the other of said
on said plates form elongated slots between themselves
diverging channels being located in one plane with the
lower inner plate surface in said single channel and the 70 for passage of the strip portions of said slide fastener
members therethrough, each of said ñanges having an
upper inner plate surface in said other diverging channel
inner face substantially normal to an inner surface of the
being offset with respect to the plane of the upper inner
respective plate; and a ywedge-shaped connecting member
plate surface in said inner channel and meeting said
connecting said slider plates in the region of the other
upper single surface in said single channel along an in
75 end of said slider and having a pair of Wedge `faces each
clined surface portion.
nordsee
7
8
extending between opposite ends of said connecting inem
rone plane with the lower inner plate surface in said
«single channel and the upper inner plate surface in said
other diverging channel being yoffset with respect `to the
plane of the upper inner plate surface in said inner
channel and meeting said upper inner surface in said
inner channel along an inclined surface portion, the
ber and substantially normal to 'and from one to the other
of said inner surfaces of said plates and approaching each
other toward said one end of said slider and including an
acute angle between themselves so as to form respectively
together with said inner surfaces of said plates and said
inner faces of said llanges a pair of diverging channels
pairs of facing free edge faces of said flanges being
meeting a single channel formed by said inner surfaces
equally spaced from said inner plate surfaces »at said
of said plates and said inner faces of said flanges and ex
one and at said `other end of said slider so that one pair
tending from said connecting member to said one end of
of facing edge faces extend upwardly inclined and the
said slider, the distance between said inner faces of said
other pair of facing edge faces downwardly inclined from
flanges at said one end of said slider being substantially
said one to said other end `of said slider.
equal to the distance between the inner face of each flange
7. A slider in combination with a pair of elongated
and the corresponding inner wedge face at the other end
slide fastener members formed from flexible material
of said slider, said single channel having at least in the
and having each a strip portion and an interlocking por
region of the junction with said diverging channels a
tion extending along one longitudinal edge `of the strip
height -considerably greater than the combined thickness
portion and having a thickness greater than that of said
of said interlocking portions of said slide lfastener mem
strip portion «and including each la pair of ‘legs extend
bers to provide ample clearance for the spreading of said
ing substantially parallel to said strip portions and
legs during engagement and disengagement of said slide 20 formed with interlocking projections adapted to engage
fastener members.
with and disengage from each other :by moving the slider
6. A `slider in combination with a pair of elongated
longitudinally along the slide fastener members so as -to
slide fastener members formed from flexible material and
move the latter substantially in the plane of said strip
havin" each a strip portion and an interlocking portion
portions .toward and away from each other whereby dur
extending along one longitudinal edge of the strip por 25 ing engagement and disengagement the legs of said
tion and having a thickness greater than that of said
members will resiliently spread, said slider comprising, a
strip portion Iand including each a pair of legs extend
pair of substantially parallel slider plates extending
ing substantially parallel to said strip portions and
spaced from each other and decreasing in width toward
formed with interlocking projections adapted to engage
one end of said slider; a pair of flanges extending re
with and disengage from each other by moving the slider 30 spectively -along longitudinal edges of each plate and pro
longitudinally along the slide fastener members so as to
jecting therefrom toward but short of the flanges of the
move the latter substantially in the plane of said strip
other plate so `that opposite flanges on said plates form
portions toward and away from eachother whereby dur
elongated slots between themselves for passage of the
ing engagement and disengagement the legs of said mem
strip portions of said slide fastener members there
bers will resiliently spread, said slider comprising, a pair 35 through, each of said flanges having an inner face sub
of substantially parallel slider plates extending spaced
stantially normal to an inner surface of the respective
from each other and decreasing in width toward one end
plate, the inner face on one flange on one plate being
of said slider; a pair of flanges extending respectively
at least in the region of said one end of said slider in
along ‘longitudinal edges of each plate and projecting
wardly offset with respect to the inner face on the op
therefrom `toward but short o-f the flanges of the other 40 posite flange on the other plate and the inner face of
plate so that opposite flanges on said plates form elon
gated slots between themselves for passage `of the strip
the other flange on said one plate being ‘at least in the
region `of said one end of said slider outwardly offset with
portions .of said slide fastener members therethrough,
respect to the inner face on the opposite flange on the
other plate; and a wedge-shaped connecting member con
each of said flanges having an inner face substantially
necting said slider plates in the region of the other end
normal to an inner surface o-f the respective plate,
each of said flanges having a free edge face and the edge 45 of said slider and having a pair of wedge faces extending
faces on the pair of flanges on one plate facing respec
between and lsubstantially normal to said inner surfaces
tively -the free edge faces of the pair of flanges on the
of said plates and -approaching each other toward said
other plate; and a Wedge-shaped connecting member
connecting said slider plates in the region of the other
end of ‘said slider and having a pair of wedge faces ex
tending between and substantially normal to said inner
surfaces of said plates and approaching each other to
ward sai-d one end of said slider and including an acute
angle between themselves so `as to form respectively to
one end of said slider and including an acute angle be
tween themselves so as to form respectively together
50 said inner surfaces o-f said plates and said inner faces .
of said llanges a pair of diverging channels meeting la
single channel formed by said inner surfaces 'of said plates
and said inner faces of said flanges and extending from
said connecting member to said one end of s-aid slider,
gether With said inner surfaces of said plates and said 55 said single channel »having at least in the region of the
junction with said diverging channels a height consider
inner faces of said flanges a pair of diverging channels
ably greater than the combined thickness of said inter
meeting a sing-le channel formed by said inner surfaces
locking portions of said slide fastener members to pro
of said plates and said inner faces of said flanges and ex
vide ample clearance for 4the spreading of said legs dur
tending from said connecting member to said one end of
said slider, said inner plate surfaces being spaced in the 60 ing engagement and disengagement of said slide fastener
members.
region of said single channel from each other a distance
8. A slide fastener comprising, in combination, »a pair
considerably greater than the combined thickness of said
of slide fastener stringe-rs each formed from flexible
interlocking portions to provide ample clearance for
material and each having a strip portion and an inter
the spreading of said legs during engagement and dis
engagement `of said slide fastener members, the upper 65 locking portion extending along -an edge of each Stringer
and facing the corresponding edge of the other Stringer,
of said inner plate Isurfaces in one of said diverging chan
each of said interlocking portions including a pair of
nels -being located in o-ne plane with lthe upper inner
plate surface in said single channel and the lower inner
legs extending respectively in planes substantially parallel
to and being connected along one edge thereof to said
plate surface in said one diverging chan-nel being offset
70
strip
portion and being formed along the other edge there
with respect to the plane of the lower inner plate sur
of
with
interlocking projections extending transverse to
face in said single channel and meeting said lower in~
the planes of said legs and being adapted to engage with
ner surface in said single channel along 'an inclined sur
and disengage from the interlocking projections 'on the
face portion, and the lower of said inner plate surfaces
legs of the other Stringer; and slider means movable along
in the `other `of said 'diverging channels being located in 75 said stringers for engaging said interlocking projections
3,070,864
10
during movement of said slider~ means `in Ione direction
and for `disengaging said interlocking projections dur
facilitating disengagement of the interlocking projec
tions of one Stringer from the interlocking projections
of `the other 'Stringer so as to uncouple said stringers
ing movement of said slider- means in the yother' direcf
from each other during movement of said slider means
tion, said slider means including at the one end which
is leading during movement of said slider means in said 5 in said other direction.
one direction means for forcing the interlocking pro
jections on one Stringer toward and in engagement With
the interlocking projections of the other Stringer so as to
couple said stringers to each other during movement of
said slider means in said one direction, and said slider 10
means including at the end thereof trailing during -rnt’ove
ment of said slider mean-s »in said other direction means
for forcing the interlocking projections on one Stringer
avv-ay from the inter locking projections on the other
Stringer and additional means for simultaneously moving 15
the interlocking portion of at least lone Stringer in di
rection transverse to the planes of Jthe legs thereof for
ly
References 'Cited in the tile of this patent
UNITED STATES PATENTS
1,960,010
Hopkinson __________ __ May 22, 1934
2,652,611
2,867,877
2,869,207
Jaster ..... __'_ _______ __ Sept. 22, 1953
Staller _______________ __ Jan. 13, 1959
Bernstein ___________ _- lan. 20, 1959
541,223
313,163
Canada _____________ __ May 21, 1957
Switzerland __________ „_ May l5, 1956
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