DE2100571A1 - Runner for the rings of ring spinning and twisting machines - Google Patents

Description

Litton Industries, Inc., 360 North Crescent Drive, Beverly Hills,

California, USA

Travelers for the rings of ring spinning and twisting machines.

The invention relates to runners for use in vertical or horizontal ring spinning or twisting machines and is characterized in that the rotor is one-piece, according to contains backward-facing extensions or extensions that make the counteracting air velocity usable, to reduce the engagement of the rotor with the ring and to reduce the angle of inclination of the rotor during operation, so that the upper part of the runner cannot come into contact with the top of the ring.

An investigation of the behavior of travelers when operating on vertical or horizontal ring spinning or twisting machine rings has shown that the runner kijjpt around the ring in its direction of movement. The extent of the tipping is a factor in the runner's weight, the speed of rotation, the diameter of the ring, the tension exerted on the traveler by the yarn and the

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Friction coefficient between the runner and that with the runner engaged part. Under normal working conditions the vertical runner stands with the ring on its lower edge and the inner ring surface in engagement. The horizontal runner stands with the underside of the inner flange and the inner one Wall of the ring carrying ridge in engagement.

Under certain working conditions, however, the runner will want to tilt to such an extent that its upper part comes into contact with the upper part of the ring. This results in very rapid wear of the upper part of the rotor, in particular: - !, if it is made of steel. The rotor uses not only faster, but the friction of the rotor against the ring is increased, that a further undesirable inhibition on the rotor in its movement is apparent around the ring.

There are various aids to the embodiment Gripped by runners to facilitate movement around the ring to reduce wear. In today's runners there is the lower part often made of plastic material, which at a lower coefficient of friction with respect to the steel ring ensures good circulation and less fast than one α Steel rotor wears out. The top of most runners is made up however, it is still preferably made of steel, since steel is less susceptible to wear from the friction of the yarn passing underneath is subject as a plastic material.

It must be taken into account that the distance between the hook ends and the vertical inner dimension of the vertical runner are limited, the limits being determined by the perpendicular extent of the ring. In the case of horizontal runners, the distance between the hook ends is

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limited by the width of the ring. Thus, in both cases a certain, determinable, maximum degree of tilt or inclination possible before the upper part of the runner follows the upper part Touches part of the ring, of course the lower hook of the vertical runner or the inner hook of the horizontal runner is in constant engagement with the lower edge or the lower side of the ring. The largest, inner, vertical dimension of the runner sets any limit when working, if the upper part of the ring with the inside of the upper part of the The runner is not engaged. However, the working conditions can be increased by using runners according to the present invention, in which by a lower extension or Extension an artificial, inner, vertical dimension of greater length is provided without reducing the weight of the runner or its other conventional dimensions are changed.

In accordance with the present invention, the lower or inner hook portion of the runner includes, integral or integral therewith, a rearward Extension or enlargement, which extends along the lower edge of the vertical ring or the lower side of the inner flange of a horizontal ring extends a considerable distance opposite to the direction in which the runner runs around the ring. The weight of the improved runner, including the extension, comes close to that of a conventional one Runner of the same size when used for the same ring. However, the situation is as follows that the balanced by the weight of the traveler force of the traveler around the ring pulling the yarn and the friction of the Runner against the underside of the ring does not produce as much inclination or inclination in the runner and thus the upper one Part of the runner remains at a distance from the upper surface of the ring.

Attempts to determine the effective length of the

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Enlargement or lengthening have been carried out, have shown that the angle between the normal perpendicular plane or the axis of the runner and the line from the upper part of the runner to the limited area on the extension, which with engaging the bottom of the ring should be no less than about 10, and preferably on the order of 20 should lie. Increasing the length of the extension to increase the size of the coil well beyond 20 is common unnecessary, although of course the greater the length of the extension, the smaller the degree of inclination of the runner among the same Working conditions is.

It has been found in practice that the length of the extension should be such that that of the end of the extension with the top of the runner and the generally perpendicular axis angles formed by the runner approximately equal to the maximum amount of tilt of a conventional runner of the same weight and is the same size on the same ring. In other words, if the maximum possible angle of inclination from an ordinary Rotor is 20, excellent results are obtained if the length of the extension is such that the above

o closed angle with the vertical axis of the rotor 20 is. Longer extensions have an effect on the runner, which remains even more upright during its use and thereby creates one maintains slightly more clearance between the top of the runner and the top of the ring.

Further, the end of the extension that contacts the underside of the ring should preferably substantially in the same plane transverse to the vertical axis as the upper inner surface of the lower hook of the runner lie. If the extension were higher, the use of the traveler for the ring would be excluded. Would the

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Extension tiofer, so would the runner in a certain Extensive tilt before the extension would engage the bottom of the ring, reducing the runner less Allow margin for the yarn. In other words, the point or line of contact of the extension with the ring should be preferably at right angles to the vertical axis of the runner and in alignment with the top surface of the lower or inner one Hook part of the runner.

The invention also relates to a new embodiment of the extension or extension, which the runner aerodynamic Properties by pushing it downward away from the ring against the upward pull of the yarn. the Runners in today's spinning machines usually run well at linear speeds in excess of 110 km per hour. Since the Runner according to the present invention is always inclined to a greater or lesser extent during normal operation, becomes a constant very fast flowing air wedge in the wedge-shaped tapered space between the upper surface of the extension BEzw. extension and the lower surface of the ring. This creates a noticeable, downward force on the runner which relieves the pressure of the enlargement against the lower surface of the ring. Furthermore, the degraded Pressure is a decrease in the normal working temperature of the ring. Occasionally depending on the spindle speed and the The angle of inclination of the rotor can cause the air to actually separate the extension from normal engagement with the ring. Thus, the extension wears out at a much slower rate than the wear on the lower one Part or inner hook of a conventional runner, which results in a longer lifespan for the runner. The extension as Part of the runner has the further advantage of being able to

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unhooking the runner from the ring is switched off, which often happens with the conventional vertical runners when the lower hook through the ring over a certain depth ninaus has been worn out.

The extension running from the back of the runner according to the present invention makes each runner one-sided directed unit, and the weight of the extension shifts the runner's center of gravity slightly backwards from the vertical Center line.

™ The low friction of the extension or extension against the Ring, which is caused by the air flow flowing in between, and the unbalanced weight distribution has to The result is that the runner is held in a less inclined position during normal operation, creating an upper margin is provided for the yarn, which cannot be achieved under the same working conditions with a conventional traveler could.

The invention is shown in the drawing, for example.

Figure 1 shows the extent to which a conventional runner fe can tilt on a ring.

Figure la shows the increased tilting ability of a runner of the same size as that of FIG. 1, which with a short extension is provided.

Figure Ib shows a greater tilting capacity of a runner of the like Size as in Fig. 1, which is provided with a longer extension.

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Figure Ic shows an even greater tilting ability of a runner of the same size as in Fig. 1, which is provided with an even longer extension.

Figux- 2 is a view similar to FIG. 1 with the exception that that is the perpendicular inner dimension of the selected conventional Runner is larger and thereby greater tilting is made possible.

Figure 2a shows the greater tilting capacity, which is due to the use an extension is achieved, which is comparable in its length with that of Fig. Ic.

Figure 2b shows how the tilting ability can be further increased by increasing the length of the extension.

Figures 3, 4 and 5 show a particular embodiment of FIG vertical runners in side view, front view and top view.

Figures 6, 7 and 3 show a further embodiment »Figures 9, 10 and 11 show yet another embodiment. J Figures 12, 13 and 14 also show another embodiment « FIGS. 15, 16 and 17 again show another embodiment.

Figure 18 shows how the weight of the runner can be increased without changing the height of the runner.

Figure 19 shows the upper end of the steel hook partially covered with synthetic material. ,

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FIG. 20 shows, in a section along the line 20-20 of FIG. 22, the manner in which the air flow moves the runner pushes down away from the ring.

FIG. 21 shows a rotor like that according to FIGS. 3-8 operating on a ring.

FIG. 22 is a view taken along line 22-22 of FIG. 21.

FIG. 23 shows a view of a horizontal runner made entirely of synthetic material on a horizontal ring.

FIG. 24 is a right side view of FIG. 23. FIG. 25 is a left side view of FIG.

Figure 26 shows another embodiment from the horizontal Runner in view on a horizontal ring.

FIG. 27 shows the runner according to FIG. 26 from the right. FIG. 28 shows the runner according to FIG. 26 from the left.

FIG. 29 is an enlarged perspective view of the rotor of FIGS. 26, 27 and 28.

Figure 30 is a perspective view of a modified form of extension and means for attaching the Rotor wire,

Figure 31 shows another embodiment of runner, wherein the Extension with the bottom of the inner flange and an upward part on the front

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Engaged end of the extension which engages the inner edge of the flange.

In Figure 1, R represents a vertical or horizontal ring with a vertical dimension A, D a conventional runner, B the inner vertical dimension of the runner and D ¹ the maximum tilted position in which both the upper and lower hook of the runner D with the top and bottom of the ring R are engaged. In this particular case, the angle is approximately 20.

If, as in Fig. La, a short extension or enlargement E

2
is added to the rotor D (from the same vertical height as the rotor D in Figure 1) so that that of the vertical axis

2
of the runner D and the line 10 running from the upper hook D to the end N of the extension E is the runner D

2
tilt as shown by the dashed line D with a maximum angle of about 22 before the upper part T of the runner

ο 1

D "touches the top of the ring at point T. When

ο ■ 11

the runner D "in Figure la in the position T in the same way as the maximum inclination of the runner D in Fig. 1 has inclined by 20, the clearance between the top of the runner and the The top of the ring should be so small that an included angle out of 10 would not be enough to make a big enough game.

In Figure Ib, in which the extension E forms an angle of 20 with the vertical axis of the rotor D (of the same vertical dimension as the rotor D in Fig. 1), the maximum angle of inclination to be 28 before the upper part

3 2

of runner D touches the ring at T, as shown in dashed lines Lines is indicated. Thus, in this embodiment a good margin between the top of the runner T and the top of the ring up to a 20 slope and for one

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Maintain any angle beyond this.

Another embodiment is shown in Fig. Ic,

3 4

tei which the extension E of the rotor D is so long that this results in an upper included angle of 25 °. Under

4 the same load conditions would runner D in one

Tilt smaller extent and give a margin, v / elcher only is slightly smaller than C. When an increased load or frictional properties be provided, whereby a swing or

Tilting beyond an effective angle of 25 can be caused

4 ο
the runner D tilt up to 33 before hitting the upper part of the

3
Ring at T meshed grain size.

In Figure 2, a runner D rait a larger inner vertical Dimension B shown, which has a maximum angle of inclination

of about 25 allows. When the shown in Figure 2a

4th
Extension E is long enough to make the same top angle

From 25 to form, the runner D can be up to one;., effective

Angle of 36 tilt before the upper part T with the a hung at

4th
T comes into engagement. If the expansion is still extended

is, as shown in Fig. 2b at E, so that an upper included angle of 30 is formed, the runner can

D tilt by an effective total angle of 38 before be

5
upper part at T meets the ring.

After these fundamental explanations, a majority should now be made
number of embodiment / are described, which are in their

Have proven to be very practical. Figures 3-22 show runners for use on vertical rings. characters 23-30 show runners for use on horizontal rings.

Figures 3, 4 and 5 show an embodiment of rotor 2, at

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which the lower part 4 including an extension 6 made of synthetic material, which has good wear properties and a low coefficient of friction of the spinning ring. The rotor part 4 is with a vertical Groove S uia provided its outer periphery into which a steel wire link Io is inserted, around which the thread runs and which wears off better than synthetic material. The extension As can be seen from FIG. 4, 6 is at right angles to the vertical axis of the rotor, and is the included angle between a line extending from the end 20 of the extension 6 to the upper part of the runner at 14 and the vertical one ?, axis is on the order of 20. However, as stated above, the exact length of extension 6 is not crucial, however, it must be borne in mind that the shorter the extension, the smaller the margin, and the longer the Extension, the greater the scope for the same effective Tilt angle is. The one lying in the groove 8 and around the lower one Partly bent wire 10 can be added by the use of a fastener or adhesive 16 or something equivalent therein be attached.

The embodiment shown in Figures 6, 7 and 8 represents is a preferred embodiment. It is in many ways same as that of Figures 3, 4 and 5 with the exception that the wire 10 goes down through the center of the rotor body 4 instead runs along its outside. This embodiment will best made by pouring the wire into the body. The wire can be the same length and the same dimension as that Have rotor body, or, if so desired, be shortened so that it is still firmly connected to it. The different Parts are provided with the corresponding numbers as in FIGS. 3, 4 and 5.

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The embodiment of Figures 9, 10 and 11 includes a larger body part 18, and the extension 20 is an integral part of the body 18 instead of an independent arm. The body part 18 is provided with a pair of grooves 22 and 24, v / which on the / Walk along the outside. These grooves are delimited by walls 26, 28, 30 and 32. According to his illustration, the wire 10 lies between the two 26 and 28. A runner designed in this way would run clockwise around the clamping ring. If, on the other hand, the runner is supposed to run counterclockwise,. the wire 10 would have to be positioned between the walls 30 and 32 so that the extension 20 would extend to the right instead of to the left.

From your previous sentence with reference to the direction of the Runner according to Figures 9, 10 and 11, it can be concluded that the in Figures 3, 4, 5 and 6, 7 and 8 shown embodiments show runners which must run in a clockwise direction. If they are to run counter-clockwise, then the extension 4 should point in the opposite direction to the right.

The embodiment shown in FIGS. 12, 13 and 14 shows a runner 34 which is made entirely of synthetic material. This embodiment, which one Extension 36 to v / eist, works satisfactorily with certain types of yarn. However, the working principle remains unchanged, since the extension 36 gives an effective angle of inclination.

The embodiment shown in FIGS. 15, 16 and 17 is essentially the same as that of Figures 3, 4 and 5 except that its extension 38 is on its surface 40 is made somewhat convex. The purpose of this bulge

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to the top bestent oarin, an automatic extension of the extension 38 su cause if the inclination angle of the rotor can increase under a greater load. The curved one Surface 40 thus has the effect of slowing down the amount of enlargement at an angle of inclination when can increase the stress on the runner.

Figure 19 shows a runner 2, whose upper urahtteil, which is not in engagement with the yarn, is partially urased from synthetic material 42, which is connected to the upper edge of the Ring would come into engagement if the traveler should incline enough to prevent the wire from wearing out.

Form in the embodiments shown in Figures 3-14 the extensions 6, 20 or 36 the part which is in contact with the ring. The part of the extension between derci Body of the runner and the engaging end of the extension touches not the ring, but, as mentioned above, its intermediate shape is of importance. You should preferably be at least as wide as the ring board and substantial longer than its width, so that the on-meeting and between Airflow compressed by the widening and the bottom of the ring of high speed produces a substantial downward force which pushes the runner away from the ring and thereby reducing the friction between the ring "and the extension. This condition is similar to that of normal working tilted rotor is shown in greater detail in FIG.

It can also be seen from FIGS. 3, 6, 12 and 15 that the enlargement 6 is preferably deepened a little in the transverse direction is so that they are more certain on the lower edge of the

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The ring slides along and captures the air flow more effectively. slide The most effective embodiment of the extension is not yet has been determined with certainty, but it is likely within the scope of the description and claims.

The rearwardly extending extension shown in the various embodiments has at a relatively light weight the effect of a displacement of the runner's center of gravity slightly backwards from the centerline of the top and bottom hooks. Sonite is the runner is asymmetrical because of the expansion in shape and weight distribution. Sometimes it may be necessary to weigh the To increase the runner without changing its dimensions. This can easily, as shown in FIG. 18, in which the material of the rotor is enlarged at 44 and afterwards extends down to the inner edge of the extension 6. The additional amount of material can be changed as desired.

FIGS. 21 and 22 show, on a smaller scale than FIG. 20, a rotor 2 according to the invention in the working position on the ring R with the end of the extension 6 engaging the lower edge of the ring. Figure 21 shows the runner in vertical view and FIG. 22 is a section along the line 22-22 of FIG.

Figures 23, 24 and 25 show the invention in a horizontal, Runner made entirely of synthetic material. The runner 50 has an outer hook end 52 and an inner end Hook end 54. The spacing is such that the runner can be placed on the ring in a conventional manner. An extension 58 extends rearward from the runner 50 approximately at right angles to the vertical axis of the runner. In the company he wants

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Runner clock oo.er less, as shown in Fig. 23 and in einor 'ijeiju tilt, which aa.i tilt a vertical runner, as shown in Figure 21 is the same.

The enlargement 53 according to FIGS. 24 and 25 has a width that is essentially the same width as the underside 60 of the inner flange 62 of the ring 56. The length of the extension 58 is normally 5: 3 greater than its width, and thus forms an upper surface 64 of appreciable size. As the runner accelerates, the in the kai Irregular Z './ischenrauia between the lower surface 60 of the ring and the surface 64 of the extension pushes the runner end 54 down sometimes to an extent of separation from the M surface 60 and reduces - the Friction between rotor \ χηϊ ring. Due to the centrifugal force, the end of the hook 54 slides constantly on the inner viand 66 of the web 68 supporting the ring, regardless of the states between the end of the extension 53 and the lower surface 60.

Figures 26, 27 and 28 are similar to Figures 23, 24 and with the exception that a further execution form of horizontal Runs is shown and the lower surface of the annular flange and the Viand of the supporting web are modified.

The runner 70 is made of wire with Ilaken ends 72 and 74. % The inner hook 74 is fixedly attached to an extension 76 similar to extension 58 of the rotor 50 in Fig. 23 attached. The lower side 78 of an inner flange 80 of rings 82 is inclined slightly upwards and the inner wall 84 of the web 86 is inclined upwards and outwards. As a result, the surface and end of the extension 76 can be shaped to conform to the lower surface 78 of the flange 80. The inner side of the

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Extension slides on a wall 84 during normal operation.

The width of the extension 76 corresponds approximately to the "width of the Lower surface 78. The extension is the same as in the other embodiments preferably longer than its width and thus has a considerable inclined surface compared to the apparent Wind when the runner accelerates. The wedge-shaped opening between surface 88 of extension 76 and the lower one Surface 78 has a significant, downward force acting on the rotor end 74 and the friction between the runner and the ring are scaled down in the same way as described above.

The end 74 of the wire runner 70 must be non-rotatable on the extension 76 be attached. This can be done by gluing the parts together or by casting the synthetic extension directly can be achieved on a roughened end 74. This embodiment is shown diagrammatically in FIG.

FIG. 30 shows a further method for connecting a runner 70 to the extension 76. There the end 74 is bent upwards, so that it engages a corresponding hole in the underside of the extension 76 and the adjacent part 90 of the Runner rests close to or against the side of the extension. This embodiment prevents any movement of the rotor with respect to the extension.

In an attempt to increase the effectiveness of the wedge-shaped opening between the extension 76 and the lower surface 78, For example, surface 88 is provided with a tapered recess 92, as shown in FIG. A modified embodiment of the rotor is shown in FIG. 31 which is a view

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is generally the same as FIGS. 25 and 28. The runner 94 contains a wire of conventional shape, v / elcher on one horizontal ring 98 is arranged, which is provided with outer and inner flanges 98 and 100. At the inner end of the hook A synthetic L-shaped member 102 is attached to the rotor 94. This link has a vertical part 104, the inner wall slides on inner wall 166 of flange 100. The member 102 extends in an L shape below the flange 100 at 108. The wire 94 is attached to the member 102 by it is fastened in a groove 110 which extends vertically downwards along the outside of the part 104 and then horizontally extends along the underside of part 108.

Extends from portion 108 in the direction of the viewer of FIG. 31 itself an extension "112, which with the bottom of flange 100 is engaged at 116. The extension is essentially the same as extension 58 in the 23 and 76 in FIGS. 26 and 29. When the runner 94 is in its normal working position, it tips forward and forms a wedge-shaped opening between the bottom 114 of the flange 100 and the top of the extension 112 so as shown in FIGS. 23 and 26.

It can be seen from FIG. 31 that the external centrifugal force of the rotor is absorbed by the engagement of the member 102 with the inner wall d 106 of the flange 100. This forms the difference to FIGS. 25 and 28, in which the runner is in engagement with the inner wall of the webs 68 and 86 supporting the ring. However, these differences do not affect the way the extension works.

In all illustrated embodiments of runners for vertical and horizontal rings each contain a backward one

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Extension, which causes a tilting of the runner while working reduced and thereby r-.iehr provides leeway for the thread than it would be the case in the absence of an extension. the Extension is constructed with reference to the lower surface of the ring, ' against which it supports itself while working and forms an upper inclined surface of erhebliciieici outer wet. This inclined surface works only with the underside of the ring and forms a wedge-shaped opening into which the apparent high-speed wind enters and one directed downwards Generates force which acts on the runner and thereby reduces the friction between runner and ring.

It is said in the claims that the extension "approximately" so far as the lower surface of the ring is with which it engages, the hoard is said to be "approximately" a reasonable one Scope of protection result. In the case of vertical runners, the extension can be a little wider than the ring is thick, but of course it can also have the same width or be etv / as smaller. In the case of a horizontal ring traveler, the width of the extension can be the same or greater than the Width of the underside of the inner flange of the ring, as shown in Figures 23-28, or less, as shown in FIG.

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Claims (17)

1. Runner for the rings of ring spinning and twisting machines nit ha "-: eniü: -r..iigijn ünden, characterized in that he is on the Hook, J.er approx .; Hook is opposite, ura can the yarn run, in de: direction opposite to its running direction with a .: H: v / eii; e :: ung (G, 20, 36, 38, 53, 76) is provided, the a contact surface nit de; λ ring (R) during the run of the runner provides which of the vertical center line Jo «runner has a gap. M. runner according to I.nsprueh 1, characterized in that in one vertical runners (2, 34) the extension (6, 20, 36, 38) • ".e: u lower hook (4, 18) is provided. 3. Runner according to claim 1, characterized in that with a V7aagerechten runner (50, 70, 94) the ISrvieiterung (58, 76) on the inner hook (54, 74) is provided and so wide x * ie the inner flange (60 , 78) of the ring. 4. Runner according to claim 1-3, characterized in that its center of gravity is in the vicinity of the vertical runner axis. 5. Runner according to claims 1-3, characterized in that the angle between the vertical runner axis and the line from the top of the runner to the point of contact of the extension (6, 20, 36, 58, 76) with the lower part of the ring is less than 10 °. BAÖ 109830/174 L / p 7047 -20- 4.1.71 B / We 6. Runner according to claim 1-3, characterized in that the Extension (38) has an upwardly curved surface (40) in the longitudinal direction, whereby the resting point has üera lower toil of the ring backwards from uei .; Runner moves when the angle of inclination of L'iufer v 7. Runner according to iinspruc'ii 1 - 3, characterized. there, 3 dor one
Runner (2, 50, 7O) / i> dt a <a / ait the yarn is in mesh -. ^ The upper part is made of steel, and the extension [C ₁ 58) is made of synthetic.,:! Material or plastic with a lower coefficient of friction than steel with respect to the ring. S. runner according to Jins claim 7, characterized, ■ r'.aj cer obora part made of steel (10) partially nit synthotiscn χ ι 1 _α γ. te rial (42) for reducing Ce ;; Friction at oine ^ t Kingrirr v / js oboron part of the runner with the upper part of the ring Le ^ eckt errs. 9. IjäufGr according to! .Nspruch 1 or 2, characterized in that. . ^1: the solid Erv / suppuration (6, 20, 36, 38, 58, 76) and dor runners are integrally and AUC synthetic material bz ^r ,, ^T. .Plastic consist, and :. Jer runner contains a part, which.-: ia \ / o3ohtlichen c. The same width v; ie the length -ier Jrv. ⁷ ci c.uruna unfein perpendicular & s Ausr.ia.j smaller than the i-iöh-s o.os iiinges has. 10. Runner according to claim 1-3, characterized in that: 3 be upper part consists of steel and the lie extension (6, 20, 36, 38, 58, 76) from b-yrrthetischo / a - material bazv /. made of plastic. 11. Runner according to hnsj.ruch 1-3, characterized by c'a :, der entire runner (34) consists of .synthetic material. BATH ORIGINAL 109830/1748 L / p 7047 -21- 4.1.71 B / We 12. Runner according to claim 9, characterized in that the upper T ^ iI the runner is made of steel wire, and the Body part ait spaced guides for Aufnahi'ae contains a downward extension of the upper steel hook tail. 13. Runner according to one of claims 1 - 14, characterized in that that the extension (76) on its upper surface xait a depression facing downwards in the transverse direction (92) is provided. 14. Runner na.cn / mspruch 1 or 2, characterized in that the part of the extension which is in singriff with the spinning ring, approximately in the same horizontal plane how the inner surface of the lower hook part of the runner lies when the runner is in a horizontal position. 15. Runner according to one of claims 1-3, characterized in that .-lau: 1 enlargement in the longitudinal direction without a depression is provided. 16. Runner according to one of claims 1-3, characterized in that the upper surface of the extension is substantially at right angles to the vertical axis of the runner. % 17. Runner according to claim 3, characterized in that the extension r.tit is provided with a one-piece part, which extends upwards from the front of the extension and engages the inner wall of the inner flange of the horizontal ring. BATH ORIGINAL 109830/1748 Blank page