EP2202338A1 - Heald shaft with robust angle connection - Google Patents

Abstract

The heald shaft has a connection device between a shaft rod (3) and a side support (4). The shaft rod has a front-sided open hollow chamber (14) at its end, and the side support has an extension (17) extended in the hollow chamber. A clamping device (134) is provided at the connection device, which is attached in an opening (31) traversing the hollow chamber of the shaft rod. The shaft rod and the extension are formed from metal.

Description

The invention relates to a heddle for use in weaving machines, in particular in slow-running weaving machines, such as fluid-operated looms, such as water looms.

For shed serve in the weaving healds, each carrying a large number of healds, run through the eyelets of the warp threads. The heddle shafts are each designed as a rectangular frame, which is also referred to as a "shaft frame". Such a shaft frame is from the CH 643 310 known. It consists of two shaft rods, which are arranged horizontally in use and two vertical side supports for connecting the shaft rods with each other. To connect the side supports with the shaft rods, the side supports have extensions extending into cavities of the shaft rods. The extensions can be secured in the shaft rod by means of transversely continuous hollow rivets.

The EP 0 466 700 B1 discloses heald frames in which the side support has an extension with a transversely continuous window. This window is used to secure and attach a seated on the extension adapter. The adapter passes through the window with at least one pin, wherein between this pin and the edge of the window, a vibration damping element is arranged. To connect the shaft rod with the side support is the together with the adapter inserted into a cavity of the shaft rod extension of the side support with an inclined Secured clamping bolt, which extends through the upper narrow side of the shaft rod.

Moreover, from the JP 2001-64843 a heald known in which the side support is bolted to the shaft rod. For this purpose, the shaft rod end is forked. The heald comprises between an upper trained as a hollow body belt and a lower belt also formed as a hollow belt on a wall which is provided with a mounting opening for connecting the side support. To attach the side support an adapter piece is pushed onto the flat wall portion having an aligned with the mounting opening of the shaft rod opening. Through the aligned openings a sleeve is pushed. The two tabs of the bifurcated end of the side support are slid over the adapter until their openings coincide with the mounting hole of the shaft rod, after which a conical head and conical nut mounting bolt is inserted and tightened.

Simple weaving machines depend on the availability of robust and cost-efficient heald frames. The question of the disassembly of the hedge can be left behind.

It is an object of the invention to provide a heddle with a simple and reliable connection of shaft rod and side support.

This object is achieved with the weaving shaft according to claim 1:

The heald has at least one of its corners connecting means between its shaft rod and the side support, which is particularly simple and robust. To the connecting means includes a tensioning device preferably in the form of an expansion sleeve, which extends transversely through the hollow chamber of the shaft rod and through two openings which are formed in the hollow chamber defining flat sides of the shaft rod.

The clamping device may be formed in one or more parts. In the simplest case, it is a wedge-shaped or conical element, which is driven into the passage which extends transversely through the shaft rod. The passage is formed between the extending into the hollow chamber extension of the side support and a clamping piece. By driving the preferably conical element or by radially expanding the same, the clamping piece and the extension are urged away from each other. The entire assembly is thereby clamped in the hollow chamber.

Preferably, the hollow chamber has a rectangular cross section with two short edges opposite each other and two long edges, wherein the connecting device generates a clamping force acting between the short edges of the cross section in response to the clamping of the clamping device. The clamping of the clamping device is carried out by driving the clamping element into the seated in the passage spreader (two-piece clamping device) or driving the element into the passage (one-piece clamping device).

The clamping device may be formed in two parts and, for example, consist of a sleeve and a separate expansion element. The expansion element serves to expand the spreading device. It is driven into an opening of an expandable body. The expansion element is the simplest Case a cylinder with excess, which is driven with a corresponding pressure in the expandable body (eg expansion sleeve) to expand this. The body can be round or angular. To fulfill the spreading and clamping function, it is sufficient if it can be expanded in the vertical direction, that is in the side support longitudinal direction.

The expandable body is preferably a plastic sleeve. Preferably, it has a cylindrical outer surface and a cylindrical through hole. On one or both sides of the passage opening may be provided with a funnel-like extension to facilitate the insertion of the expansion element. In addition, the preferably cylindrical expansion element can be provided at one or both ends with a more or less formed chamfer or a conical portion to facilitate insertion into the expandable body.

The spreading device can be designed as a sleeve closed annular or slotted. For example, For example, it may have one or more slots that extend only over part of its axial length.

Preferably, the aforementioned clamping piece is part of a spacer which can be attached to the extension or the side support and ensures that the preferably made of a metal such as steel side support does not directly touch the preferably made of metal, such as aluminum shaft rod. The spacer can thus serve as an electrical insulator which separates the various metals of the side support and the shaft rod from each other and thus prevents contact corrosion due to different electronegativities of the metals involved. This is particularly advantageous in looms in which water to drive the Weft thread is used (so-called water looms) or other weaving machines that work in a humid environment. Preferably, the spacer is a one-piece or multi-part plastic body with an open-ended or closed pocket for receiving the extension of the side support. In addition, a passage goes across the plastic body. This passage is preferably bounded to one half of an arcuate recess of the extension and to another half of an arcuately delimited recess of the clamping piece, which is formed as part or portion of the spacer.

The spacer may be a plastic injection molded part. Preferably, it consists of an at least somewhat yielding not too stiff plastic. The compliance particularly concerns the ability to slightly stretch the spacer in a direction coincident with the side-stanchion longitudinal direction to clamp the spacer in the shaft of the shaft stub. The extensibility of the spacer can be increased by providing its flat sides with recesses.

Preferably, the spacer is held on the side support. For this purpose, the spacer may be provided with one or more connecting means, for example latching fingers, latching noses or the like. The corner joint according to the invention represents a very robust, simple, cost-effective and corrosion-resistant corner joint. It is stable and allows low to medium speeds of, for example, 300 to 600 revolutions per minute.

Preferably, the heddle rails are releasably suspended on the shaft rods. When changing the warp thread the hangers (which are also referred to as riders) removed and taken out the heald bar together with the strands. The heald frames remain in the machine. Because the heald remain except for repairs in the loom and are not taken out to Kettfadenwechsel, the side supports and the shaft rods can be connected by a non-releasable without tools press-fit connection, as formed by the pressed-in expansion sleeve expansion bolts. Alternatively, it is also possible to provide releasable expansion elements in connection with round or angular, one- or multi-part expansion sleeves, for example in the form of conical screws or non-circular or eccentric expansion elements.

• Figur 1 einen erfindungsgemäßen Webschaft, in schematischer Vorderansicht,
• Figur 2 den Webschaft nach Figur 1 in einer ausschnittsweisen, schematisierten Darstellung,
• Figur 3 den Webschaft nach Figur 2, in Querschnittsdarstellung seiner Eckverbindungseinrichtung,
• Figur 4 die linke untere Ecke des Webschafts nach Figur 1 oder 2, in perspektivischer Explosionsdarstellung,
• Figur 5 das untere Ende der linken Seitenstütze des Webschafts nach Figur 1, in vereinfachter Prinzipdarstellung,
• Figur 6 den Querschnitt der Seitenstütze nach Figur 5 im Horizontalschnitt im Bereich der Eckverbindung,
• Figur 7 einen Abstandshalter für die Eckverbindung in schematisierter Vorderansicht,
• Figur 8 den Abstandshalter nach Figur 7, geschnitten entlang der Linie II-II in Figur 7,
• Figur 9 das linke Ende des unteren Schaftstabs des Webschafts nach Figur 1, in schematisierter Darstellung,
• Figur 10 den Webschaft nach Figur 9, geschnitten entlang der Linie I-I,
• Figur 11 die Seitenstütze mit Abstandshalter in dem Hohlraum des Schaftstabs, im Vertikalschnitt,
• Figur 12 die Spreizhülse in Stirnansicht,
• Figur 13 die Spreizhülse nach Figur 12, im Längsschnitt,
• Figur 14 die Seitenstütze mit Adapter und Spreizhülse in dem Hohlraum des Schaftstabs mit nicht expandierter Spreizhülse,
• Figur 15 einen Spreizbolzen in Stirnansicht,
• Figur 16 den Spreizbolzen nach Figur 15, in Seitenansicht,
• Figur 17 die befestigte Eckverbindung mit den Elementen nach Figur 11 bis Figur 16, im Vertikalschnitt,
• Figur 18 die Eckverbindung nach Figur 17, geschnitten entlang der Linie III-III,
• Figur 19 die Spreizhülse entsprechend Figur 12,
• Figur 20 den Spreizbolzen entsprechend Figur 16
• Figur 21 die Spreizhülse nach Figur 19 mit den von dem Spreizbolzen erzeugten Kräften, im Längsschnitt,
• Figur 22 eine abgewandelte Spreizhülse mit Spreizkonus in Stirnansicht,
• Figur 23 die radial expandierbare Anordnung nach Figur 22 im Längsschnitt,
• Figur 24 eine Spanneinrichtung mit elliptischem Schloss in Stirnansicht,
• Figur 25 die Spanneinrichtung nach Figur 24 im Längsschnitt,
• Figur 26 die Eckverbindung nach Figur 14 im Längsschnitt,
• Figur 27 die Eckverbindung nach Figur 17, im Längsschnitt,
• Figur 28 eine alternative Ausführungsform der Spanneinrichtung vor dem Spannen,
• Figur 29 die Spanneinrichtung nach Figur 28 während des Spannens im Längsschnitt und
• Figur 30 die Spanneinrichtung nach Figur 28 in gespanntem Zustand im Längsschnitt.

Further details of advantageous embodiments of the invention will become apparent from the description, the drawings or claims. The description is limited to essential aspects of the invention and other circumstances. The drawing reveals more details and is to be consulted. Show it:

• FIG. 1 a weaving shed according to the invention, in a schematic front view,
• FIG. 2 following the weave FIG. 1 in a fragmentary, schematized representation,
• FIG. 3 following the weave FIG. 2 in cross-sectional view of its corner connection device,
• FIG. 4 the lower left corner of the weave post FIG. 1 or 2 , in a perspective exploded view,
• FIG. 5 the lower end of the left side support of the heald post FIG. 1 , in simplified schematic representation,
• FIG. 6 the cross section of the side support after FIG. 5 in horizontal section in the area of the corner connection,
• FIG. 7 a spacer for the corner joint in a schematic front view,
• FIG. 8 the spacer after FIG. 7 , cut along the line II-II in FIG. 7 .
• FIG. 9 the left end of the lower shaft rod of the heald post FIG. 1 in a schematic representation,
• FIG. 10 following the weave FIG. 9 , cut along the line II,
• FIG. 11 the side support with spacers in the cavity of the shaft rod, in vertical section,
• FIG. 12 the expansion sleeve in front view,
• FIG. 13 the expansion sleeve after FIG. 12 , in longitudinal section,
• FIG. 14 the side support with adapter and expansion sleeve in the cavity of the shaft rod with unexpanded expansion sleeve,
• FIG. 15 a spreader pin in front view,
• FIG. 16 after the expansion bolt FIG. 15 , in side view,
• FIG. 17 the fixed corner connection with the elements FIG. 11 to FIG. 16 , in vertical section,
• FIG. 18 the corner connection after FIG. 17 , cut along the line III-III,
• FIG. 19 the expansion sleeve accordingly FIG. 12 .
• FIG. 20 the expansion bolt accordingly FIG. 16
• FIG. 21 the expansion sleeve after FIG. 19 with the forces generated by the expansion bolt, in longitudinal section,
• FIG. 22 a modified expansion sleeve with expansion cone in front view,
• FIG. 23 the radially expandable arrangement according to FIG. 22 in longitudinal section,
• FIG. 24 a clamping device with elliptical lock in front view,
• FIG. 25 the clamping device after FIG. 24 in longitudinal section,
• FIG. 26 the corner connection after FIG. 14 in longitudinal section,
• FIG. 27 the corner connection after FIG. 17 , in longitudinal section,
• FIG. 28 an alternative embodiment of the tensioning device before tightening,
• FIG. 29 the clamping device after FIG. 28 while tensioning in longitudinal section and
• FIG. 30 the clamping device after FIG. 28 in a stretched state in longitudinal section.

In FIG. 1 a heald 1 is illustrated, which has an upper shaft rod 2, a lower shaft rod 3 and two side supports 4, 5. The vertically arranged side supports 4, 5 connect the shaft rods 2, 3 with each other. The joints 6, 7, 8, 9 are formed at the corners of the rectangular heald 1. For the following explanation of the connecting device is on the in FIG. 1 left lower joint 6 referred to. The remaining connection points 7, 8, 9 are formed accordingly.

FIG. 2 illustrates the joint 6 between the shaft rod 3 of the side support 4. The side support 4 is preferably formed as a sheet metal bent part. It has a U-profile cross-section open toward the shaft rod 3. It consists for example of stainless steel or other suitable material. The shaft rod 3 is preferably formed by an aluminum extruded profile. His cross section is out FIG. 3 seen. It has two flat planar side walls 10, 11, which are connected to each other at the top and bottom by a web 12, 13. They define a cross-section, for example, substantially rectangular cavity 14, which is open to the front, the side support 4 facing the end of the shaft rod 3 out.

Above the web 13 is still a smaller longitudinally passing through the shaft rod 3 groove 15 for attachment of heddle rails by means of riders.

To the corner joint 6 belongs FIG. 2 and 5 can be seen a connector 16 which extends as an extension 17 of the side support 4 away in the cavity 14 inside. The connector 16 is formed for example by a flat cuboid body between the two legs of the U-shaped profile of the side support 4 projects into it, there fastened by suitable means, such as rivets 48, 49 and is held so that the greater part of the fitting 16 extends from the side support 4 away. As FIG. 4 and 5 show the connector 16 has a straight narrow side or edge 18 and a second at a distance parallel thereto arranged straight narrow side or edge 19. While the edge 18 is continuous, the edge 19 is interrupted by a recess 20 with a semicircular edge 21. As FIG. 6 shows, the connector 16 is narrower than the side support. 4

The cross section of the connecting piece 16 is substantially smaller than that of FIG. 10 apparent cross-section of the cavity 14. For adaptation serves an adapter 22 which serves as a spacer 23, as in particular from FIG. 4 . 7 and 8 is apparent. The spacer 23 is a plastic body whose outer contour is dimensioned so that it can be inserted with little play in the cavity 14. For receiving the connecting piece 16 and the extension 17, it has a cross-sectionally substantially rectangular pocket 24, the cross-section of which approximately matches the cross-section of the connecting piece 16, but is preferably larger by a small clearance.

The spacer 23 is preferably symmetrical with respect to a vertical plane E and formed in one piece. However, it can also be divided along the vertical center plane E and thus formed by two half-shells.

On its upper narrow side, the adapter has a narrow web 25. At its lower end, a comparatively solid pressure piece 26 forms the end of the spacer 23. The web 25 and the pressure piece 26 are interconnected by flat, parallel, preferably slightly stretchable side walls 29, 30 which define the bag 24 between each other.

The adjacent to the pocket 24 pressure piece 26 has a limited by an arcuate edge 27 recess 28, which also extends through side walls 29, 30 and there forms circular holes. The recess 28 thus bounded in half a passage 31 which leads transversely through the spacer 23 and its pocket 24. The pocket 24 may be end-to-end, i. be open at both ends of the spacer 23.

On the side support 4 side facing the spacer 23 may be provided with locking tongues 32, 33, which serve to hold the adapter 22 to the connector 16. As FIG. 2 shows, the locking tongues 32, 33 engage behind the connector 16 and thereby secure the spacer 23 and adapter 22 to the side support 4.

To the corner connection 6 forming connecting device also includes a clamping device 134, which preferably comprises a spreading device, for example in the form of an expansion sleeve 34, and in FIG. 4 as well as the FIGS. 12, 13 and 19 is shown separately. The expansion sleeve 34 fits through aligned holes in the side walls 10, 11 holes 35, 36, which are also aligned with the passage 31 in the assembled state. The expansion sleeve 34 has an axial length, which between the outer flat sides of the side walls 10, 11 to be measured thickness of the shaft rod 3 at least preferably reaches, but slightly exceeds, as from the Figures 3 and 18 evident. The expansion sleeve 34 is preferably made of a slightly elastic or stretchable plastic. It is preferably formed annularly closed. Alternatively, she can at least one point of its circumference be slit wholly or over part of the axial length and in this case also consist of a less elastic plastic. It encloses a preferably cylindrical opening 37, which serves for receiving a spreading element 38, for example in the form of a bolt or cylinder 39 made of metal or another material.

The dimensional relationships of the elements of the corner joint 6 arise in particular from the FIGS. 11 to 18. FIG. 11 illustrates the side support 4 with your connector 16, which has been used together with the adapter 22 and spacers 23 in the cavity 14 of the shaft rod 3. The distance 31 is aligned with the holes 35, 36. The spacer 23 has a certain vertical play V. This results from the difference of the vertical distance Y of the webs 12, 13 and the vertical height X of the spacer 23. The diameter B of the passage 31st is consistent with the diameter of the bore 35, 36 match. The outer diameter Since the expansion sleeve 34 is less than the diameter B as in FIG. 12 is shown. The inner diameter Di is again smaller than the outer diameter A of the preferably cylindrical expansion element 38 (FIG. FIGS. 15 and 16 ). As FIG. 14 shows, between the expansion sleeve 34 and the passage 31 and the bores 35, 36 a game S that is as large as half the difference between the diameter B and the diameter Da. The diameter difference A minus Di between the diameters of the expansion element 38 and the inner diameter Di of the expansion sleeve 34 is preferably greater than the vertical play V.

The production of the corner joint 6 is as follows:

First, the in the FIGS. 7 and 8 separately illustrated spacers 23 on the extension 17 and the fitting 16 according to FIG. 5 attached. Thereafter, the provided with the spacer 23 side support 4 in the cavity 14 of the shaft rod 3 after FIGS. 9 and 10 plugged in. It will be the configuration after FIG. 11 receive. The expansion sleeve 34 is then inserted into the passageway 31 as it is FIG. 14 shows. To overcome the game S and to eliminate the vertical clearance V, the expansion element 38 is now driven into the opening 37, whereby the state after the FIGS. 17 and 18 is reached. The pressure piece 26 is urged by the strong radial expansion of the expansion sleeve 34 of the connector 16 away. The vertical height of the adapter 22 thereby increases sharply, so that its upper web 25 and the pressure piece 26 move away from one another.

Due to the vertical extent of the adapter 22, the vertical clearance V is overcome and the adapter 22 is clamped in the cavity 14. Due to the spread, i. Expansion of the adapter 22 creates a vertical clamping force between the webs 12 and 13. In this state, the corner joint 6 is fixed. There is a rigid coupling between the side support 4 and the shaft rod 3. The same applies to the other corner joints 7, 8 and 9.

The FIGS. 19 to 21 illustrate the function of the clamping device 134, ie the expansion of the expansion sleeve 34 under the action of the expansion element 38. There is a radially outward force distribution, when the expansion element 38 has been driven into the relatively narrower opening 37. The latter can be facilitated if the cylindrical expansion element 38 is provided at least on one side with a sufficient chamfer 40.

FIG. 23 illustrates an alternative tensioning device 134. The expansion sleeve 34 can, as shown, with a be provided with a double conical passage in which conical fittings 41, 42 are provided accordingly. The fitting 41 may have a threaded bore, while the fitting 42 has a pocket for receiving the head 43 of a bolt. By tightening the bolt, the two fittings 41, 42 are contracted, whereby the expansion sleeve 34 is radially expanded.

In a further alternative tensioning device 134, the expansion sleeve 34 can also according to FIG. 24 and FIG. 25 be educated. The expansion sleeve 34 is not round, for example, square formed with rounded corners. Accordingly, the passage 31 and the bores 35, 36 are also formed out of round in the form of openings. The passage 31 of this designed as a square sleeve expansion sleeve 34 may be out of round, for example, oval. If it is rotated by means of a suitable tool, it widens the expansion sleeve 34 at least in the vertical direction, which in turn causes the clamping process already described above.

The corner joint 6 of the heald 1 provides a mechanically, stable, electrically insulating connection between the side support 4 and possibly made of a different material or metal shaft rod 3. To make the connection is an adapter 22 which sits on a connector 16 of the side support 4 and is inserted together with this in a cavity 14 of the shaft rod 3.

The FIGS. 26 and 27 illustrate again in cross section the connecting device according to the FIGS. 14 and 17 , As can be seen, the expansion sleeve 34 has a certain elasticity. It is radially expanded by the expansion element 38, wherein in particular the section located between the side walls 10, 11 radially expands and the connecting piece 16 and the pressure piece 26 in the vertical direction from each other away against the webs 12, 13 clamped.

A modified and particularly simple embodiment is in the FIGS. 28 to 30 illustrated. The tensioning device 134 is formed here by a body 50 tapering to one side, for example in the form of a cone. Its two end faces 51, 52 have a different size. The body 50 may have a circular cross section, a rectangular cross section or another cross section. The body 50 is thus a cone or a prism. Preferably, it consists of an at least slightly yielding material such as plastic. It may be formed integrally and in one piece from one and the same material. Alternatively, it can consist of several materials. For example, it may have a metal core provided with a plastic sheath.

The passage 31 is in this embodiment, as FIG. 28 shows, conical. The diameter D of the conical passage 31 coincides in the median plane M with the diameter and the size of the end face 41.

When the body 50 is driven into the passage 31 as shown in FIG FIG. 29 is shown, he drives the connector 16 and the pressure piece 26 apart. Under elastic deformation of the body 50, this, as FIG. 30 shows so far pressed into the passage 31 that its end faces 51, 52 both slightly beyond the corresponding side walls 10, 11 protrude. The body 50 thereby biases the pressure piece 26 and the connection piece 16 away from one another and pushes them against the webs 12, 13.

This embodiment of the tensioning device 134 is characterized by particular simplicity.

Transverse to the shaft rod 3 and the parting line between the connector 16 and a pressure piece 26 of the adapter 22, a passage 31 into which a clamping device is inserted. This consists for example of an expansion sleeve 34 and a spreader 38 which can be pressed into the expansion sleeve 34 and thereby expands. The expansion causes a vertical elongation of the adapter 22, whereby the corner joint 6 is tightened.

reference numeral

1

heald

2, 3

stave

4, 5

side supports

6,7,8,9

Corner joints, connection device

10, 11

side walls

12, 13

Stege

14

cavity

15

groove

16

connector

17

extension

18, 19

edge

20

recess

21

edge

22

adapter

23

spacer

24

bag

e

vertical plane

25

web

26

Pressure piece

27

edge

28

recess

29, 30

side walls

31

passage

32, 33

locking tongues

34

Spreading / expansion sleeve

35, 36

drilling

37

opening

38

spreader

39

cylinder

V

vertical game

Y

vertical internal dimension of the cavity 14

X

vertical height of the adapter 22

B

Diameter of the passage 31

There

Outer diameter of the expansion sleeve 34th

di

Inner diameter of the expansion sleeve 34th

A

Outer diameter of the cylinder 39

S

game

40

chamfer

41, 42

fittings

42

head

43

bolt

48, 49

rivet

50

body

51, 52

faces

D

diameter

M

midplane

134

tensioning device

Claims (15)

Weave (1)
with at least one connection device (6) between a shaft rod (3) which has at least at its end a hollow chamber (14) which is open at the end, and a side support (4) which has an extension (17) extending into the hollow chamber (14) , wherein to the connecting device
a tensioning device (134) is included, which is in a hollow chamber (14) of the shaft rod (3) passing through passage (31) is inserted, and for tensioning the extension against webs (12, 13) of the hollow chamber (14). Weave according to claim 1, characterized in that the tensioning device (134) includes a spreading device (34) and a spreading element (38) to be inserted into an opening (37) of the spreading device (34) to expand it and the side support (4) to secure to the shaft rod (3). A heald according to claim 1, characterized in that the tensioning device (134) is formed by a body (50) which is to be driven transversely to the shaft rod (3) into the passage (31) and tapers towards one end. Weave according to claim 1, characterized in that the side support (4) and the extension (17) are formed of metal and / or that the shaft rod (3) is formed of metal. Weave according to claim 1, characterized in that between the side support (4) and the shaft rod (3), an electrical insulator (23) is arranged. Weave according to claim 1, characterized in that on the extension (17) a spacer (23) is arranged. Weave according to claim 5 and 6, characterized in that the spacer (23) defines a distance between all edges of its cross section and the extension (17). Weave shank according to claim 5 and 6, characterized in that the spacer (23) is a one-piece or multi-part plastic body having a passage (31) for receiving the spreading device (34). Weave shank according to claim 8, characterized in that the passage (31) of the spreading device (34) with holes (35, 36) in side walls (10, 11) of the shaft rod (3) are aligned. A heald according to claim 8, characterized in that the spacer (23) has a pocket (24) whose shape is adapted to the shape of the extension (17) to receive it, and that the passage (31) holds the pocket (24). at its edge cuts. A heald according to claim 8, characterized in that the spacer (23) is at least somewhat expandable in a direction parallel to the side support (4), the spacer (23) forming a rigid portion on at least one of the narrow sides of the pocket (24) (26) which is urged away from the extension (17) by the spreading device (34). Weave according to claim 1, characterized in that the extension (17) has on one of its narrow sides a recess (21) which delimits a part of the passage (31). Weave shank according to claim 11, characterized in that the pressure piece (26) has a recess (28) which delimits a part of the passage (31). Weave according to claim 5 and 6, characterized in that the spacer (23) with the side support (4) is connected. Weave shank according to claim 1, characterized in that the expansion element (38) is a cylinder (39) made of metal, whose outer diameter (A) exceeds the inner diameter (Di) of the expansion sleeve formed as a spreading device (34).

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