[0001] The invention relates to bottom-loading basket-style carriers for articles such as
beverage bottles.
[0002] Previous methods and apparatus for loading bottles into basket-style carriers from
the bottom are disclosed in US patent number 2,276,129 to Wesselman, US patent number
2,603,924 to Currie et al., US patent number 3,521,427 to Masch, US patent number
3,627,193 to Helms, US patent number 3,698,151 to Arneson, US patent number 3,751,872
to Helms, US patent number 3,747,294 to Calvert et al., US patent number 3,805,484
to Rossi, US patent number 3,842,571 to Focke et al., US patent number 3,848,519 to
Ganz, US patent number 3,924,385 to Walter, US patent number 3,940,907 to Ganz, US
patent number 4,915,218 to Crouch et al., US patent number 4,919,261 to Lashyro et
al., US patent number 5,234,103 to Schuster, and US patent number Re. 27,624.
[0003] The present invention provides a method and apparatus for the continuous opening
and loading of basket-style bottom-loading carriers.
[0004] A first aspect of the invention provides a tightening apparatus for drawing together
panels of a carrier as the carrier is moved along a predetermined path, the panels
having alignment apertures, the apparatus comprising a conveyor in synchronous motion
with the carrier and a plurality of pairs of opposing lug sets, each lug set in operative
communication with said conveyor characterised in that each lug set having a stationary
lug member and moveable lug member, such moveable lug member is reciprocally transversely
translatable with respect to said stationary lug member and said conveyor between
a retracted position and a predetermined extended position and in that said lug sets
initially engage the alignment apertures when said moveable lug members are in said
retracted position and translate transversely inwardly toward a respective opposing
one of said pairs of opposing lug sets to said predetermined extended position.
[0005] According to an optional feature of this aspect of the invention, said stationary
lug member may further comprise a lip portion in contact with a portion of said alignment
aperture when said moveable lug member is in said predetermined extended position,
said lip portion being adapted to prevent said panel being moved out of its predetermined
path.
[0006] According to yet another optional feature of this aspect of the invention, the alignment
apertures may have a triangular configuration and wherein said moveable lug member
and said stationary lug member each have a configuration corresponding to a portion
of the alignment aperture engaged thereby.
[0007] According to a further optional feature of this aspect of the invention, the alignment
apertures may have an inwardly pointing triangular configuration in relation to a
centreline of the carrier and wherein said moveable lug member has a complementary
angular configuration.
[0008] Optionally, said stationary lug member has an upwardly extending lip.
[0009] Other advantages and features of the present invention will be apparent from the
following description, the accompanying drawings, and the appended claims.
Figure 1 is an isometric illustration of a carrier suitable for loading bottom loading
basket style carriers according to a preferred embodiment of the invention;
Figure 2 is a plan view of a blank for forming the carrier of Figure 1;
Figure 3 is an illustration of the carrier of Figure 1 in collapsed condition.
Fig. 5 is a schematic illustration of an apparatus for loading bottom-loading basket-style
carriers according to a preferred embodiment of the invention.
Fig. 31 is an isometric illustration of a folder-gluer assembly of the apparatus of
Fig. 5.
Fig. 32 is a top plan view of the folding block of the folder-gluer assembly of Fig.
31.
Fig. 33 is a side elevational view of the folding block of the folder-gluer assembly
of Fig. 31.
Fig. 34 is a side elevational view of the folding block of the folder-gluer assembly
of Fig. 31.
Fig. 35 is a side elevational view of the folding block and sealing block of the folder-gluer
assembly of Fig. 31.
Fig. 36 is a top plan view of the bottom-panel alignment assembly.
[0010] There are no figures 4,6-30, 37-39.
Detailed Description of the Preferred Embodiment The Carrier
[0011] The method and apparatus 10 described herein as the preferred embodiment of the invention
is particularly suitable for loading carriers such as the bottom-loading basket-style
carrier 3 shown in Fig. 1. Although use of the method and apparatus 10 of the subject
invention is not limited to the carrier 3 described below, the features of the invention
are very clearly described by reference to the invention's handling and loading of
the carrier 3 illustrated. A blank 906 for forming the carrier 3 is shown in Fig.
2. Fig. 3 is a plan view of the collapsed carrier 3 of Fig. 1.
[0012] The carrier 3 is of the nature described in US patent application serial number 08/326,987.
That application is also owned by the owner of the present invention application.
The carrier 3 and blank 906 for forming the carrier 3 are described below to facilitate
understanding of the invention. First, reference is made to Figs. 1 and 2 simultaneously.
The carrier 3 illustrated is generally designed to accommodate two rows of bottles.
The examples of carriers 3 discussed herein describe use of the invention with carriers
3 that accommodate two rows of three bottles and two rows of four bottles, that is,
a six-pack version and an eight-pack version. However, the invention may also be practiced
to accommodate rows of other multiples of bottles. Both sides of the carrier are the
same. Thus, the features described with respect to the side shown in Fig. 1 are equally
applicable to the unseen side. The side wall 920, 930 has a cut-out portion that generally
defines a lower side wall band 921, 931 and an upper side wall band 923, 933. Foldably
connecting the lower 921, 931 and upper 923, 933 bands to respective end walls 940,
942, 950, 952 are respective corner tabs 922, 932, 924, 934. The corner tabs 922,
932, 924, 934 respectively form bevelled corners at the intersections of the side
walls 920, 930 and end walls 940, 942, 950, 952. A center cell is formed on each side
of the carrier by cell bands 925, 935, corner tabs 926, 936 foldably connected to
the cell bands and a central cell portion 927, 937 integrally formed with the side
wall 920, 930. A handhold flap 984 is also visible from the view shown. Cut lines
between center cell portions of side walls 920, 930 and respective handle structure
panels 980, 982, 990, 992 terminate in respective curved cut lines 986, 988, 996,
998. Cut lines between the upper bands 923, 933 of respective side walls 920, 930
and corresponding center cell portions terminate in respective curved cut lines 987,
989, 997, 999. The blank 906 is essentially symmetric about a perforated fold line
dividing the handle panels 980, 982, 990, 992, and halves, of the carrier 3 from one
another. One of the two bottom wall panels 910, 912 is widthwise greater than the
other and for convenience is designated the greater bottom wall 912. The other bottom
wall panel is conveniently designated the lesser bottom wall panel 910. Support tabs
961, 963, 971, 973 for attachment to the bottom wall panels 910, 912 are foldably
connected to the lower edges of respective riser panels 960, 962, 970, 972. A suitable
carrier for loading by the invention may also have the support tabs connected to the
lower edges of respective end walls 940, 942, 950, 952 along fold lines without departing
from the scope hereof. The center cell bands 925, 935 are connected along perforated
fold lines to the lower portions of respective handle panels 980, 982, 990, 992. Handhold
apertures 981, 983, 991, 993 are formed in the respective handle panels 980, 982,
990, 992. Handhold flaps 984, 994 are connected along perforated fold lines to respective
handle panels 980, 990 within the respective handhold apertures 981, 991 thereof.
Curved cut lines 986, 987, 988, 989, 996, 997, 998, 999 help direct stress away from
strategic termination points of cut lines in the carrier 3.
[0013] Other features of the carton will be apparent from the drawings and in particular
Figures 1, 2 and 3.
[0014] As previously mentioned, the method and apparatus described herein are particularly
suitable for loading carriers having the general characteristics of the type described
above. The elements of the carrier 3 enable it to be formed in collapsed condition,
shipped, loaded into the apparatus described herein, and then erected and loaded with
bottles. Although several types of articles or bottles are suitable for handling and
loading by the invention, the invention is particularly useful for loading so-called
contoured PET bottles into the carrier 3 illustrated.
[0015] The carrier 3 is received by the apparatus of the invention in collapsed condition,
as illustrated in Fig. 3, with the bottom wall panels 910, 912 pivoted upwardly into
face contacting relationship with the side walls of the carrier 3.
Overview of Apparatus and Method
[0016] Referring first to the schematic illustration in Fig. 5 of the overview of the apparatus
10 according to a preferred embodiment of the invention, the apparatus 10 is constructed
upon an elongate frame. In the illustration the direction of movement of bottles 1
and carriers 3 is from left to right. As a general overview, bottles move through
the apparatus 10 in two rows along an essentially linear path. As the bottles move
along their defined path, carriers (in collapsed condition with bottom wall panels
folded upwardly flat against the sides of the collapsed carrier) are moved along the
hopper 30 to a point of interface with the carrier feeder 50. The feeder 50 moves
individual carriers 3 from the hopper 30 to a timing section 60. A timing-transport
section meters out carriers at set intervals and a predetermined rate of speed. In
one embodiment, the timing-transport section consists of two consecutive assemblies.
The first segment of the two is a timing section 60 in which each carrier 3 is removed
from suction cups 54 of the feeder 50 and conveyed at a predetermined stagger to the
downstream components of the apparatus 10. In what may generally be referred to as
the transport segment of the timing-transport section a path is defined between a
pair of vertically oriented belts. More specifically, this segment is referred to
as a nip belt assembly 70. The vertical nip belts 72 are a pair of opposing endless
belts that pinch, or "nip," the handle area of each carrier (the carrier's topmost
portion) and move the carriers in a defined linear path down the apparatus 10. When
the carriers 3 are in the hopper 30, they are in collapsed condition with the bottom
wall panels 910, 912 pivoted up and lying flat against the sides of the carrier 3.
Upon removal from the hopper 30, the bottom wall panels 910, 912 of the carrier 3
fall away from their position flat against the sides of the carrier 3. As a carrier
3 moves through the timing section the bottom wall panels 910, 912 are engaged and
pulled outward to open the carrier 3 for loading. As the carriers 3 are being pulled
open along the carrier path of the apparatus 10, bottles are moved along in a path
beneath the carriers. In the lower path (the bottle path) a star wheel 105 on either
side of the apparatus 10 meters a row of bottles 3 into distinct groups for loading.
For example, groups of three or four bottles in each row. An endless chain with lugs
is one of the means for transporting bottles after they have been metered by the starwheel
105. Bottle grippers 113 (moving in conveying fashion such as upon an endless chain)
immediately follow the star wheels 114 and maintain the spacing and alignment of each
bottle grouping. As the bottles 3 move further along the length of the apparatus 10
the bottle grippers 113 assure the spacing between bottles 1 and groups of bottles.
At the same time, the carriers 3 move to a position whereby each bottom wall panel
910, 912 is received by a pair of downwardly-sloping gripping and declination belts
92, 94 & 93, 95. An overhead conveyor mechanism such as an endless overhead chain
assembly 100 is aligned over the centrally located handles of the carriers 3 in parallel
alignment with the declination belt assembly 90. Block members 102 mounted upon the
overhead chain engage the tops of the handle portions of the carriers 3. The declination
belt assembly 90 and overhead chain assembly 100 move the carriers 3 forward and downward
over the dual-row groups of bottles. The lowering work of the declination belt assembly
90 and overhead chain assembly 100 is completed by the pusher wheel assembly 120.
The pusher wheel assembly 120 has block members 122 mounted upon it to push downwardly
upon the tops of the handles of the carriers 3, thereby fully lowering the carriers
onto respective groups of bottles. As the carriers 3 move from the pusher wheel assembly
120 a package conveyor 130 such as side lugs 134 mounted upon respective opposing
endless chains 132 engage the trailing end panel of the carriers 3/packages 7 and
push them further along the apparatus 10. As the carriers 3 are moved along by the
package conveyor 130, a bottom panel locking section 140 folds carrier support tabs
961, 963, 971, 973 and bottom wall panels 910, 912 into position for attachment of
the support tabs 961, 963, 971, 973 to the bottom wall panels 910, 912 and for closure
of the bottom of the carrier 3. The bottle panels 910, 912 are drawn together for
proper alignment and held in that position while closure of the bottom of the carrier
3 is completed by a rotating punch lock mechanism. The loaded, fully closed carrier
is then ejected from the apparatus 10.
Folder and Gluer
[0017] Referring now again particularly to Fig. 5, upon leaving the seating portion 120
of the apparatus 10 each package 7 is engaged and transported by a package lug assembly
130. The package lug assembly 130 primarily consists of a pair of opposing endless
chains 132 upon which are mounted lugs 134 that engage each package 7. Closure of
the carton 3 of each package 7 is accomplished in the folding and gluing area 140
of the apparatus 10 as the packages are moved along by the package lugs 134.
[0018] Referring now particularly to Fig. 31, therein is illustrated a folder-gluer assembly
140 of the apparatus for loading bottom-loading basket-style carriers 10 according
to a preferred embodiment of the invention. The gluing operation will be discussed
later, however, for clarity of understanding it is now noted that glue is applied
to the interior side (that is, the side which faces the inside of the erected carrier
3) of the so-called greater bottom wall panel 912 of the carrier 3. Glue is applied
to adhere the riser panel support tabs 961, 963, 971, 973 to the interior side of
the greater bottom wall panel 912. In a version of the carrier without support tabs
961, 963, 971, 973 folding and adherence of the support tabs would obviously not be
necessary for such a carrier. The elements of the folder-gluer assembly 140 are positioned
to fold the elements of the carrier 3 in sequence. In addition to the illustration
of Fig. 31, reference may now also simultaneously be made to Figs. 32, 33, 34 and
35 which contain additional views of the folder-gluer feature and any of the previously
described figures which illustrate the panels 910, 912 and support tabs 961, 963,
971, 973. The folding features of the folder 140 are static elements that engage applicable
panels and flaps of carriers 3 as the packages 7 are moved by the package lugs 134
in the direction indicated by the direction arrow 71. As the packages approach the
folding section the bottom panels flaps 910, 912 are generally more horizontally inclined
rather than downwardly vertically oriented. In the folding section, the bottom panels
910, 912 are first folded vertically downward, then under the carrier 3 into face-to-face
relationship for later locking. The support tabs 961, 963, 971, 973 are folded into
a horizontal position. The support tab folding elements are contained in what is conveniently
referred to as a tab folding block 141. Consistent with the carrier orientation discussed
above, the greater bottom panel flap 912 is the first of the two bottom panel flaps
190, 912 engaged. The greater panel flap 912 is engaged and caused to be folded vertically
downward by the inclined edge of the first vertical panel-folding wedge 162. The first
vertical panel-folding wedge 162 folds the greater panel 912 to a vertically downward
position wherein it is sandwiched between the wedge 162 and the folding block 141.
The folding block 141 provides edges and surfaces which separate and fold the support
tabs into place and spaces which accommodate the tabs as they are being manipulated.
Each pair of a long and short support tab 961 & 971, 963 & 973, at opposing ends of
the carrier is engaged simultaneously by the block 141 (note Fig. 3, the end of the
carrier with support tabs 961, the longer tab, and 971, the shorter tab, is the leading
end). From a point of view facing the front portion of the support block 141, as in
Fig. 34 in particular, the right side of the block 141 is configured to engage and
accommodate the longer tabs 961, 971 while the left side is configured to engage and
accommodate the longer tabs 963, 973. The block 141 first separates each long tab
961, 963 from its accompanying short tab 971, 973. A horizontal facet 142 and a vertical
facet 143 form a wedge-like cove 159 for the longer, or major, tab 961, 963. A recess
154 for the minor tab is formed by an inclined facet 152 and a vertical facet 153.
A short upwardly-inclined edge 155 at the intersection of facet 143 and 152 engages
the major support tab 961, 963. As the carrier advances, the major support tab 961,
963 moves divergingly away from the minor support tab 971, 973 along the edge 155.
The leading major tab folding edge 155 intersects and is continued by a trailing major
tab folding edge 144. The trailing major tab folding edge 144 is formed at the intersection
of the major tab vertical facet 143 and the upwardly-inclined major tab ramp 145.
As the carrier 3 continues its travel the major support tab 961, 971 continues its
diverging ascent along trailing major tab folding edge 144. Because the major tab
ramp 145 and the trailing major tab folding edge 144 also diverge outwardly as well
as upwardly, the major support tab 961, 971 ultimately is placed in and travels in
face contacting relationship with the major tab ramp 145. As the carrier continues
to travel, the major support tab 961, 971 subsequently comes into face contacting
relationship with the horizontal surface 156 of the folding block. As the major support
tab 961, 963 is folded to the right side of the folding block 141 as described, the
minor support tab 971, 973 is folded to the left. The minor tab recess 154 of the
block 141 provides space for the minor tab 971, 973 of the carrier 3 to be initially
separated from the major tab 961, 963. The minor tab 971, 973 is initially engaged
by the leading minor tab folding edge 160. The leading minor tab folding edge 160
is formed at the intersection of the planes of the minor tab vertical facet 147 and
the major tab ramp 145, and intersects the trailing minor tab folding edge 148. The
trailing minor tab folding edge 148 is formed at the intersection of the minor tab
vertical facet 147 and the minor tab ramp 149. The minor tab 971, 973 is moved outwardly
and upwardly with respect to the carrier 3 by the outwardly and upwardly diverging
edge 148. Further downstream movement of the carrier 3 causes the minor tab 971, 973
to come into face-contacting relation with the minor tab ramp. As the carrier 3 begins
its travel upon the folding block 141 the bottles 3 in the carrier are supported on
their undersides by the support ledges 158. When the carrier package 7 reaches the
horizontal surface 156 of the folding block the major 961, 963 and minor 971, 973
tabs have been folded outwardly and into flat face relationship with the underside
of bottles 3 of each package 7. As the conveyor continues to transport a package 7
downstream, glue is applied by conventional means such as a glue gun to the downwardly-extending
greater bottom wall panel 912 as mentioned above. Glue is applied to the central portion
of the panel 912 in a position suitable for the support tabs 961, 963, 971, 973 to
be adhered thereto when the greater panel is folded up into flat face relation with
the bottom of the package 7. Glue is applied at a convenient location such as the
gluer recess 157 provided.
[0019] Referring particularly now to Figs. 31 and 35, after glue has been applied to the
bottom panel 912 the bottom of the carrier 3 is closed and locked in successive stages.
The dead plate 161 following the folding block 141 provides a suitable static surface
upon which the package 7, and bottles 3 in the package in particular, may glide during
further transport. The second vertical panel folding wedge 164 engages and folds the
lesser bottom wall panel 910 downward in the same manner as the first vertical panel-folding
wedge 162 folds the greater panel 912 as described above. The greater 912 and lesser
910 bottom panels are sandwiched between respective first 162 and second 164 panel-folding
wedges and the dead plate 161. The first horizontal panel-folding wedge 166 and second
horizontal panel-folding wedge 168 fold the respective bottom panels 912, 910 into
their closing position of flat face relationship with one another. As can be more
clearly seen in Fig. 35, the first horizontal panel-folding wedge 166 is longer and
engages and folds the glue-containing greater panel 912 under before the lesser bottom
panel is manipulated. The lesser bottom panel 910 thus becomes the outer-most of the
two bottom panels.
[0020] The bottom wall sealing plate 170 follows the dead plate 161 and provides a surface
174 upon which the support tabs 961, 963, 971, 973 and glue-containing greater bottom
panel 912 are caused to be pressed together thereby adhering the support tabs 961,
963, 971, 973 to the greater bottom panel 912. The bevelled lip 172 at the front of
the sealing plate 170 helps the package 7 enter the sealing plate 170 without becoming
easily snagged. To ensure a smooth transition from the deadplate 161 to the sealing
plate 170, the bevelled lip 172 of the sealing plate 170 is positioned lower than
the deadplate 161 and horizontal folding wedges 166, 168 and the plate 170 itself
is positioned sufficiently close to the deadplate 161 to permit the bottom the bottom
panels 910, 912 to engage the bevelled lip 172 without snagging. The side walls 176
of the sealing plate 170 urge the side walls of the carrier 3 inwardly to a desired
position and help keep the transported packages 7 properly aligned during transport.
The front portion of each sidewall 176 is inwardly bevelled to also help guide the
package onto the sealing plate 170 between the walls 176.
Closure of the Carrier
[0021] Closure of the bottom of the carrier 3 may be achieved by several means. For example,
adherence of the bottom panels 910, 912 to one another by an adhesive. Another effective
means for closure is the use of a locking mechanism known as a "punch lock" in the
packaging field wherein the outermost of the two bottom panels has male locking members
that are superimposed over corresponding female apertures and members formed in the
inside bottom panel. To help effectively close the bottom of the carrier 3, particularly
if the carrier will be closed utilizing a punch lock, the two bottom panels 910, 912
can be drawn inwardly to help align the two bottom panels 910, 912. This is particularly
useful, and necessary, to engage male and female lock features and is also useful
to generally ensure that the carrier 3 is in its optimum squared-up condition with
the bottom panels 910, 910 overlapping by a predetermined amount. Referring now to
Fig. 36, the bottom panels 910, 912 are urged into predetermined face-to-face alignment
with one another by means of conveyor-mounted lug sets 182 in the bottom-panel alignment
assembly. The lug sets 182 engage pull holes (also known as alignment apertures or
tightening apertures) 914 (which can be seen in Fig. 3) in the bottom panels 910,
912 of the carriers 3. Each lug set 182 has an outwardly-biased moveable lug member
184 and a stationary lug member 186. Outward biasing may be accomplished by the spring
196 shown or other suitable biasing mechanism. A pair of opposing lug sets 182 is
mounted upon a pair of support rods 190. The pairs of lug sets 182 are mounted upon
conveyors such as endless chains 188. The moveable lug member 184 of each set is spring-biased
outwardly and is moved inwardly along the support rods 190 through moving contact
with the cam rail 192. The moveable lug members 184 of the lug sets 182 are in a retracted
position prior to translating inwardly upon the ramp 194. The tightening apertures
914 of the carriers 3 are initially engaged by the lug sets 182 when the moveable
lug members 184 are retracted (that is, prior to riding up the ramp 194). Each moveable
lug member 184 has an angular-shaped protruding portion 185 that is configured to
correspond to and be closely received by the apex of the triangular-shaped tightening
apertures 914. Each stationary lug member 186 has a lip-like linear protruding portion
187 that is configured to correspond to and be closely received by the base of the
triangular-shaped tightening apertures 914. As previously discussed, the bottom panels
910, 912 of carriers 3 are in face-to-face partially overlapping relationship when
the packages 7 leave the folding and gluing area 140 of the apparatus 10. As the moveable
lug members 184 travel the leading ramp 194 they pull the bottom panels 910, 912 inwardly
to a predetermined position. The stationary lug members 186 help prevent the bottom
panels 910, 912 from being drawn too far inwardly. The leading ramp 194 may be stepped
in known manner to provide two tiers of ramps for the moveable lugs 184 so that leading
and trailing moveable lug members may move inwardly essentially simultaneously to
prevent a "scissoring" effect when the bottom panels 910, 912 are drawn together.
In this arrangement cam followers of the leading moveable lug members engage only
the upper-tiered ramp. The upper-tiered ramp is more steeply inclined than the lowered-tiered
ramp. The less steep lower-tiered ramp is contacted only by the cam followers of the
trailing moveable lug members. Because of the difference in pitches of the two ramps
the leading lug members are delayed in their inward movement until the trailing lug
members are also moving inwardly. After the bottom panels 910, 912 have been tightened
a predetermined amount and held in place by the lug sets, 182 punch lock features
may be engaged by means of conventional rotating fingers 200 which synchronously protrude
upwardly through the alignment assembly 180. The moveable lug members 184 are allowed
to retract to their outwardmost position by a ramp 195 at the trailing (or exit) end
of the cam rail 192. The fully-closed packages 7 may then exit the apparatus by conventional
means.
1. Spannvorrichtung zum Zusammenziehen von Wandflächen (910, 912) eines Trägers (3),
wenn der Träger entlang eines vorbestimmten Weges bewegt wird, wobei die Wandflächen
(910, 912) Ausrichtungsöffnungen (914) aufweisen, und wobei die Vorrichtung (180)
eine Fördereinrichtung (188), die in synchroner Bewegung mit dem Träger (3) ist, sowie
eine Vielzahl von Paaren gegenüberliegender Nasensätze (182) umfaßt, wobei jeder Nasensatz
(182) in wirksamer Verbindung mit der Fördereinrichtung (188) steht, dadurch gekennzeichnet,
daß jeder Nasensatz (182) ein stationäres Nasenelement (186) und ein bewegliches Nasenelement
(184) aufweist, derart, daß das bewegliche Nasenelement (184) reziprok quer in Bezug
auf das stationäre Nasenelement (186) und die Fördereinrichtung (188) zwischen einer
zurückgezogenen und einer vorbestimmten ausgefahrenen Position verschiebbar ist und
ferner dadurch, daß die Nasensätze (182) anfänglich die Ausrichtungsöffnungen (914)
in Eingriff nehmen, wenn die beweglichen Nasenelemente (184) sich in der zurückgezogenen
Position befinden und sich quer nach innen in Richtung eines jeweils gegenüberliegenden
Paares der Paare von gegenüberliegenden Nasensätzen (182) in die vorbestimmte ausgefahrene
Position bewegen.
2. Spannvorrichtung nach Anspruch 1, wobei das stationäre Nasenelement (186) weiter einen
Lippenabschnitt (187), der in Kontakt mit einem Abschnitt der Ausrichtungsöffnung
steht, umfaßt, wenn sich das bewegliche Nasenelement (184) in der vorbestimmten ausgefahrenen
Position befindet, und wobei der Lippenabschnitt (187) angepaßt ist, um zu verhindern,
daß die Wandfläche aus ihrem vorbestimmten Weg heraus bewegt wird.
3. Spannvorrichtung nach Anspruch 1 oder 2, wobei die Ausrichtungsöffnungen (914) eine
dreieckige Konfiguration aufweisen und wobei das bewegliche Nasenelement (184) und
das stationäre Nasenelement (186) jeweils eine Konfiguration (185, 187) aufweisen,
die einem Abschnitt der davon in Eingriff genommenen Ausrichtungsöffnung (914) entspricht.
4. Spannvorrichtung nach einem der Ansprüche 1 bis 3, wobei die Ausrichtungsöffnungen
(914) eine nach innen zeigende dreieckige Konfiguration im Verhältnis zu einer Mittellinie
des Trägers aufweisen und wobei das bewegliche Nasenelement (184) eine komplementäre
winklige Konfiguration (185) aufweist.
5. Spannvorrichtung nach einem der vorstehenden Ansprüche, wobei das stationäre Nasenelement
(186) eine sich nach oben erstreckende Lippe (187) aufweist.