EP0393380A1 - Turn-lock fastener for sports shoe - Google Patents

Abstract

In this turn-lock fastener for a sports shoe according to the invention, a pull-cable arrangement, which pulls together the shoe- closing flaps, can be wound onto and unwound from a rotary cable pulley. The pull-cable arrangement consists in this connection of a single pull-cable, and a stop element is provided coaxially with the cable pulley and rotatably mounted in such a manner that the cable pulley can only perform a maximum of up to approximately two rotations in one direction of rotation. A particularly space-saving turn-lock fastener is thus produced, with reliable safety as far as overturning of the pulley cable is concerned. <IMAGE>

Description

The invention relates to a twist lock for a sports shoe, according to the preamble of claim 1.

A twist lock of the required type is known from EP-A-255 869. In this known twist lock, the closing flaps of the shoe can be contracted or released by changing the effective length of two tension cable tensioning elements by rotating the actuating device in one direction or the other. In order to be able to precisely adapt the shoe to the foot of a user, a precise adjustment of the twist lock is provided in that a pawl device is arranged in the area between the twist grip and a rope pulley for the two pull rope tensioning elements, which means one with the twist grip in compliance contains an idle rotatable intermediate element, a pawl carried by this intermediate element and a toothed ring incorporated in a housing cover, the pulley being able to be rotated by the rotary handle with the interposition of a Maltese cross gear, a gear drive or a planetary gear.

The invention has for its object to provide a twist lock of the type required in the preamble of claim 1 so that the space requirement and the manufacturing costs can be reduced even further.

This object is achieved by the features specified in the characterizing part of claim 1, wherein advantageous refinements and developments of the invention are features of the subclaims.

Since in the twist lock according to the invention - in contrast to the known embodiment described - only a single pull rope is used as a pull rope arrangement, its manufacturing costs can be reduced and its structural dimensions - in particular with respect to a smaller diameter - reduced.

So that in this embodiment according to the invention the locking tabs can be pulled together sufficiently far by the single pulling rope to ensure that the shoe can always be reliably adapted to the user's foot, a sufficiently long cable path is (in comparison to the known embodiment described above, a corresponding one Extension, possibly approximate doubling, of the cable route) is advantageous. This can be achieved in the twist lock according to the invention, for example, by approximately two revolutions of the sheave, the stop being effective by the stop element after the second rotation (the basic use of a stop is - as in the known embodiment mentioned - necessary to damage the pull rope by to avoid over-tightening).

• Fig.1 eine Teil-Außenansicht eines als Skischuh dargestellten Sportschuhes mit einer An­ordnungsmöglichkeit für den erfindungsge­mäßen Drehverschluß;
• Fig.2 eine Querschnittsansicht durch den zusam­mengebauten Drehverschluß, etwa entspre­chend der Schnittlinie II-II in Fig.3;
• Fig.3 eine Unteransicht des Drehverschlusses (Ansicht etwa entsprechend III-III in Fig.2), zur Veranschaulichung der Aus­gangsstellung von Seilscheibe und An­schlagelement vor dem Aufwickeln des Zugseiles;
• Fig.4 und 5 ähnliche Unteransichten wie Fig.3, jedoch zur Veranschaulichung anderer Drehstel­lungen der Seilscheibe bzw. des Anschlag­elements;
• Fig.6 eine ähnliche Querschnittsansicht wie Fig.2, jedoch von einem zweiten Ausfüh­rungsbeispiel des Drehverschlusses;
• Fig.7 eine Unteransicht (etwa entsprechend Pfeil VII in Fig.6) des in Fig.6 gezeig­ten Ausführungsbeispieles;
• Fig.8 eine Detail-Schnittansicht gemäß Linie VIII-VIII in Fig.7;
• Fig.9 eine Horizontal-Schnittansicht entlang der Linie IX-IX in Fig.6.

The invention is explained in more detail below with reference to the drawing. Show in this drawing

• 1 shows a partial external view of a sports shoe shown as a ski shoe with a possible arrangement for the twist lock according to the invention;
• 2 shows a cross-sectional view through the assembled twist lock, approximately corresponding to section line II-II in FIG. 3;
• 3 shows a bottom view of the twist lock (view approximately corresponding to III-III in FIG. 2), to illustrate the starting position of the rope sheave and the stop element before the pulling rope is wound up;
• Figures 4 and 5 similar bottom views as Figure 3, but to illustrate other rotational positions of the pulley or the stop element;
• 6 shows a cross-sectional view similar to FIG. 2, but of a second embodiment of the twist lock;
• 7 shows a bottom view (approximately corresponding to arrow VII in FIG. 6) of the exemplary embodiment shown in FIG. 6;
• 8 shows a detailed sectional view along line VIII-VIII in FIG. 7;
• 9 shows a horizontal sectional view along the line IX-IX in FIG.

In FIG. 1, one possibility of a number of possibilities is illustrated on a ski boot 1 that is only partially illustrated, such as the one according to the invention Twist lock 2 can be attached to a sports shoe. In the selected example it is assumed that this twist lock 2 with its housing, which cannot be seen in more detail in FIG. 1, on the outer shell, specifically there in the instep area, of the ski boot 1 with the aid of known per se and therefore not illustrated in more detail in FIG Means can be arranged.

This twist lock 2 contains as a traction cable arrangement a single traction cable 3, one of which, in the present case, the outer end 3a is fastened on one side of the shoe upper 4, in its lower heel region 4a, while the other traction cable end 3b is fixed to a pulley 5 is, which is rotatably mounted in the housing of the twist lock 2 in a manner yet to be explained, in order to wind and unwind the pull cable 3. The section 3c lying between the two cable ends 3a and 3b is suitably led over the two closing flaps (one is indicated at 1a) of the ski boot 1 (i.e. approximately in the upper instep area) and then on the side opposite the free outer end 3a of the shoe upper 4 in the heel area 4a via a suitable deflection sheave 6 to the actual twist lock 2 with the sheave 5. In order to be able to carry out this winding and unwinding of the traction cable 3, the rotary lock 2 has an actuating device for rotating the cable pulley 5 in one direction or the other (cf. double arrow 7), this rotary actuating device in the present case by means of one to be explained later cap-shaped rotary handle 8 is formed.

The actual twist lock 2 is in a first embodiment below, primarily based on the Fig. 2 and 3 explained in more detail. Thereafter, this twist lock 2 contains a relatively flat, approximately cylindrical housing 9, which has a central recess 10, in which the sheave 5 - in relation to its circumferential dimensions - is accommodated in a suitable and freely rotatable manner.

The rope pulley 5 has a circumferential rope groove 11 in its circumference, in which the associated end 3b of the pull rope 3 is fixed and which is sufficiently deep to be able to accommodate about two turns of the rope therein.

The housing 9 is largely covered at the top and practically completely covered by a cover 12, whereby the housing 9 and cover 12 can thereby be firmly, optionally also releasably connected to one another, that axially extending screws (not shown) are provided here or - as indicated - lower ones Circumferential lugs 12a are bent inwards under the lower peripheral edge of the housing 9.

As can be seen in FIG. 3 (bottom view), the pull rope end 3b connected to the rope sheave 5 is fed approximately tangentially to the rope sheave 5 or to its rope groove 11 through a guide channel 13 which corresponds to the peripheral wall 12b of the cover 12 and the housing 9 enforced.

As can be seen in FIG. 2, there is a space in the area between the housing 9, the cover 12 and the upper side of the sheave 5 in which a planetary gear is provided for driving the sheave 5. A coaxial belongs to this planetary gear (cf. Twist-lock axis 2a) sun gear 14 arranged directly above the sheave 5, which serves as a drive gear and is connected in a rotationally fixed manner to the cap-shaped twist grip 8 by a countersunk screw 15. This sun gear 14 has a downwardly extending pivot-like axial extension 14a, which forms a central bearing pin for the sheave 5. Furthermore, this sun gear has an extension extending axially upward through a bearing bore 16 of the housing cover 12 in the form of a bearing journal end 14b, by means of which the sun gear 14 is mounted in the bearing bore 16 of the cover 12 in a freely rotatable manner.

Furthermore, the planetary gear includes an internally toothed ring gear 17, which is attached to the inner circumference of the housing 9 in the area above the rope sheave 5 in a rotationally fixed manner. In the area between this ring gear 17 and the sun gear 14, planet gears 18 are provided, which preferably project upwards from the top of the rope sheave 5 Bearing journals 19 are freely rotatable and mesh with both the sun gear 14 and the fixed ring gear 17.

In a similar way as in the known embodiment according to EP-A-255 869, an intermediate disc 20 is also arranged in the area between the housing cover 12 and the rotary handle 8, in which a pawl 21 is pivotably mounted about a pivot pin 22 in the manner of a two-armed lever . This pawl 21 belongs to a pawl device, which also includes a toothed ring 23 incorporated in the outer peripheral region on the upper side of the housing cover 12. The resiliently biased pawl 21 and the toothed ring 23 can in cooperate in such a way that with a rotational movement in the sense of winding the pull rope 3, a sensitive adjustment and locking of the rope sheave 5 and thus the pull rope 3 can be achieved, while in the other direction of rotation the meshing engagement between pawl 21 and toothed ring 23 is canceled and thereby the pull rope can be handled by the pulley 5.

In order to be able to carry out the necessary pawl movement by appropriate measures in this manufacture or removal of the toothing engagement between pawl 21 and toothed ring 23, measures similar to those in the known embodiment mentioned are provided, with limitation of a corresponding free travel of the rotary handle 8 relative to the intermediate disk 20 a downward projection 24 is provided on the underside of this rotary handle 8 and engages in a ring-sector-like recess 25 in the upper side of the intermediate disk 20. It has already been mentioned that in this first exemplary embodiment of the rotary handle 2, the actuating device for rotating the rope sheave 5 is designed as a cap-shaped rotary handle 8 and is screwed to the bearing end 14b of the sun gear 14 which extends axially upwards by a countersunk screw 15. Between the top of the housing cover 12 and this cover 8, however, the intermediate disk 20 is still arranged, ie the countersunk screw 15 also passes through a central bore 20a provided in this intermediate disk 20, into which a type of spacer plain bearing ring 26 can preferably be inserted. In a correspondingly offset central recess 8a in the top of the rotary handle 8 is a collar 27 inserted and supported, in which the head 15a of the countersunk screw 15 is received. If necessary, a suitable cover plate (not illustrated here) can be fitted flush and easily detachable over this collar disk 27 in order to create a kind of protective cover. This cap-shaped rotary handle 8 also covers the area of the intermediate disk 20 with a lateral peripheral wall 8b and at least partially also the housing 9 and its cover 12, in that this peripheral wall 8b projects correspondingly downwards, as can be seen in FIG. At least in the area of this peripheral wall 8b, the rotary handle 8 can also be provided with knurls or other useful handle elements, so that it can be easily operated (turned). This type of twist grip 8 also contributes to a particularly flat, space-saving design of the entire twist lock 2.

Of particular importance in this twist lock 2 is the measure that a stop element 28 is rotatably mounted coaxially to the sheave 5 in or on the housing 9. As has been explained above, the downwardly extending, pivot-like axial extension 14a of the sun gear 14 forms a central bearing pin for the sheave 5. This central bearing pin 14a is downward through a reduced in diameter, from the sheave 5 protruding end 14a ' additionally extended so far that at the same time the middle (inner) section 28a of the stop element 28 is freely rotatably mounted on this lower pin end. To secure this middle section 28a on the pin end 14a ', a corresponding securing element, for example a snap ring 29, can be attached to the outermost pin end.

The stop element 28 is in the form of a stop arm 28 extending essentially radially or in the manner of a spoke from the central bearing pin 14a or its lower pin end 14a ', as can be seen in FIG. At its radially outer end, this stop arm 28 has an axially upwardly directed stop projection 28b, which can be fastened separately on this radially outer end, but is preferably, as illustrated in the example in FIG. 2, designed as an integrally bent arm end.

2 and 3 also show that in the underside of the housing 9 receiving the sheave 5, ie in the outer peripheral region (outside the sheave 5), an outer, annular groove 30 is incorporated, which extends approximately over the entire circumference of the housing 9 extends, with the exception of only the peripheral section in which the guide channel 13 for the insertion of the pull rope end 3b is located. The axially upward-facing stop projection 28b of the stop arm 28 engages in this groove 30. The stop arm 28 is designed and arranged so that its stop projection 28b can slide in the groove 30 with a corresponding rotational movement of the stop arm 28 around the central bearing pin 14a / 14a '. The two circumferential ends 30a and 30b of this groove 30 form counter-stops for the stop projection 28b, ie the stop projection 28b comes into contact with these counter-stops 30a, 30b during a rotational movement in one or the other direction of rotation of the stop element 28.

From the underside of the sheave 5 there is also a driving stop 31, which is designed as an approximately block-shaped attachment and is fixedly connected to this sheave 5 and which, depending on the rotational position and direction of rotation of the sheave 5 - with respect to the circumferential direction - on one side or the other 28c or 28d of the stop arm 28 comes to rest and takes this stop arm with it when the pulley 5 rotates further.

3, 4 and 5 different rotary or stop end positions of the stop arm 28 around the central bearing pin 14a and 14a 'are illustrated.

In the rotary position according to FIG. 3, it is assumed that the rope sheave 5 is in its starting position, in which the twist lock 2 is completely released and the traction rope 3 is completely unwound from the rope sheave 5. In this basic rotational position, the stop projection 28b lies with the side 28d of the stop arm 28 against the first counter stop 30a of the groove 30. If the rotary handle 8 and thus the rope sheave 5 are turned in the direction of arrow 7 in order to wind the end of the pull rope 3 3b onto the rope sheave 5 and thus to pull the flaps of the ski boot 1 together, then the rope sheave 5 is turned for almost a whole first turn moved so far until their driving stop 31, which had been in contact with the stop arm side 28c in the starting position, comes to rest on the opposite stop arm side 28d, as shown in FIG. Only when the sheave 5 is then rotated further from the position shown in FIG. 4 in the direction of arrow 7 (that is, in the same direction) with the help of the rotary handle 8, is the stop arm 28 also moved by the Driving stop 31 carried in the same direction of rotation (arrow 7). This further rotary movement of the rope sheave 5 (in the direction of rotation of the arrow 7) can then only continue until the stop arm 28 or its stop projection 28b comes to rest with the side 28c on the second counter stop 30b of the groove 30, as is shown in FIG. 5 is illustrated. This further rotary movement (after the first rotation) of the rope sheave 5 is therefore slightly less than a full rotation due to the length of the groove 30.

From this comparison of the extreme rotational positions according to FIGS. 3 to 5, it can be seen that the sheave can carry out almost two full revolutions for winding up the pull rope 3, which results in a sufficiently long cable path for a sufficiently large contraction movement with the single pull rope 3 to be able to ensure two locking flaps of the ski boot 1 so that this ski boot can be reliably adapted to the foot of a ski boot user in the manner required in each case. The opening of the twist lock 2, that is to say the unwinding of the traction cable 3 from the sheave 5, then takes place in exactly the opposite direction to that described with reference to FIGS. 3 to 5. It should also be emphasized in this connection that the pawl device used can be used to set and maintain any required intermediate position of the sheave 5 and thus of the twist lock 2 in an extremely sensitive manner.

6 to 9, a second embodiment of the twist lock according to the invention with some further particularly advantageous configurations is shown below lines and developments of rotary fastener parts explained.

In these FIGS. 6 to 9, all closure parts designed in the same or approximately the same way as in the first exemplary embodiment are designated with the same reference numerals with the addition of a line, so that a further detailed description of these closure parts is largely unnecessary.

Reference is first made to FIGS. 6 and 7. It is assumed that the pull rope end 3b '- as known per se - is fixed by means of an approximately pin-like nipple 32 on the sheave 5' or in its groove 11 ', i.e. this nipple 32 runs approximately parallel to the downwardly extending central journal 14'a of the sun gear 14 '. As can be seen particularly well in the detailed sectional view of FIG. 8, the traction cable nipple 32 has a protrusion 32a projecting downward from the underside of the pulley 5, which is sufficiently long so that in this exemplary embodiment it is also firmly attached to it the pulley 5 'connected driving stop for the substantially radially outwardly extending stop arm 28' forms. A separate driving stop, such as the block-shaped extension 31 of the first example, is therefore not necessary here.

However, it can be particularly advantageous here if the nipple projection 32a - as illustrated in particular in FIG. 8 - has a cap formation or an attached cap 33 in the illustrated form on its outer free end, ie this nipple 32 thus has an approximately mushroom shape .

In this case, the stop arm 28 'is then expediently not designed to be completely straight and radially running, but it has on its two sides 28'c and 28'd, viewed in the circumferential direction, each having a bulge 34 or 35 which is adapted to the outer diameter of the nipple 32 for the appropriate engagement of the nipple projection 32a. At least in the area of these bulges 34, 35, the material thickness of the stop arm 28 '- as can be seen in FIGS. 7 and 8 - is somewhat recessed, so that there the cap 33 of the nipple projection 32a when interacting with the stop arm 28' from below partially engages. In this way, a possible axial deflection of the stop arm 28 'is reliably prevented by the engagement of the cap 33 during the engagement between the nipple projection 32a and the respective bulge 34 or 35.

While in the first exemplary embodiment (cf. in particular FIG. 2) the middle section 28a of the stop arm 28 is secured with the aid of preferably a snap ring 29 on the outermost lower pin end 14a ', a simplified definition is proposed in the example in FIG. 6 in that the middle section 28'a of the stop arm 28 'is fixed in the manner of a snap connection by this middle section 28'a (with a correspondingly large opening) is snapped onto an annular groove 36 which is incorporated at the outermost lower pin end 14a'.

In any case, here again the stop arm 28 'has at its radially outer end an axially upwardly projecting stop projection 28'b which extends into the outer, circular groove 30 'slidably engages, which is incorporated into the underside of the pulley 5' receiving housing 9 '.

In the example of FIGS. 6 and 7, at least two are distributed over the circumference at the lower outer peripheral edge of the housing 9 ', i.e. 7 diametrically opposed snap hooks 37 are integrally formed, which are intended for fastening the entire twist lock 2 'to a sports shoe. For this purpose, only suitable recesses need to be incorporated into the upper material, for example in the shoe shell of a ski boot or in the upper leather of another sports shoe, into which the snap hooks 37 can be inserted appropriately, so that there is a reliably firm and permanent snap connection between the twist lock 2 ' and associated sports shoe results in an extremely simple and quick assembly.

The twist lock according to the invention, both in the embodiment according to the first example (FIGS. 1 to 5) and in the embodiment according to the second example (FIGS. 6 to 9), can be produced from any suitable material. This means that at least its essential closure parts can be made at least partially of metal, in particular light metal, or of a suitable castable and machinable, in particular thermoplastic; it may also be expedient if necessary to manufacture some of the essential closure parts from metal and some from plastic, so that the individual closure parts of a twist lock can be made from the materials which appear to be the most expedient in each case.

In particular in the case of the embodiment illustrated in FIG. 6, it is assumed that all essential parts of the closure 2 'are made from the plastic material mentioned, which also applies to the housing 9' and the housing cover 12 '.

The housing cover 12 'can be made largely in the same shape and design, as described in detail with reference to Figures 2 and 3 of the first embodiment. As a first deviation from this, the housing cover 12 'has on its underside and in the region of its outer peripheral edge at least two rivet structures 38 projecting against the underlying housing 9', which are evenly distributed over the circumference, i.e. in the case of two such rivet designs 38, these are diametrically opposed.

In the housing 9 'two rivet receiving holes 39 are incorporated correspondingly opposite the two rivet formations 38. The sizes of these rivet designs 38 and rivet receiving holes 39 in the housing cover 12 'and housing 9' are coordinated so that this housing 9 'and the housing cover 12' can be quickly and reliably connected to one another by ultrasonic riveting when assembling the entire twist lock 2 '.

In this cross-sectional view of FIG. 6, however, further modifications can be seen not only of the housing cover 12 ', but also of the cap-shaped rotary handle 8' - in each case in comparison to the first exemplary embodiment (see, for example, FIG. 2). After that, this handle 8 'according to Figure 6 above is perfect closed, and - as indicated by dash-dotted lines - it can have a kind of diagonal toggle 40 on its top for better grip operation, but in the same way as in the first example (FIG. 2) it can only be provided with external knurling.

In the present example (Fig.6) it is assumed that this cap-shaped rotary handle 8 'is made entirely of a suitable plastic material. On the inside of the circumferential wall 8'b of this rotary handle 8 ', that is, with a slight radial distance from this circumferential wall 8'b offset inwards, is distributed over the circumference either a large number of individual snap connection elements or a kind of one-piece, jacket-shaped snap connection element 41 resilient within of the rotary handle 8 'formed (integrally formed). This snap connection element 41 (or each individual snap connection element) has at its lower end (lower edge) a radially inwardly pointing hook formation 41a. Matching this hook formation 41a is on the outer circumference of the housing cover 12 '- and this is a second peculiarity of this housing cover design - an outer circumferential groove 42 is incorporated, in which the snap connection elements or the snap connection element 41 with the mentioned hook formation 41a is in snap engagement, which is also extremely simple assembly of the corresponding parts of the twist lock 2 'contributes. The snap connection engagement between the hook formation 41a of the snap connection element or the snap connection elements 41 and the outer circumferential groove 42 of the housing cover 12 'is designed so that this outer circumferential groove 42 at the same time a Drehfü approximately groove for the snapped hook formation 41a and thus for the entire associated twist grip 8 'forms, that is, this results on the one hand a rotary guide and on the other hand an axial fixing of the twist grip 8' with respect to the entire twist lock 2 '.

In this case, too, the central sun gear 14 'forms the drive gear for the planetary gear arranged between the housing 9', pulley 5 'and the housing cover 12', to which - in the same way as in the first example - a stationary internal ring gear 17 'and several planet gears 18 ' belong. The sun gear 14 'in turn has an axially upwardly extending, substantially cylindrical bearing end 14'b, which extends through a suitable central bearing bore 16' of the housing cover 12 'and a suitable central bore 20'a in the above the housing cover 12' lying washer 20 'extends upwards.

As can be seen from FIGS. 6 and 9, the journal end 14'b has a circumferential flattening 43 on its end section which axially penetrates the intermediate disk 20 ', and the central bore 20'a in the intermediate disk 20' is corresponding to that with the Circumferential flattening 43 provided end portion of the bearing end 14'b also formed with a flattening, so that by the engagement of the bearing end 14'b in the central bore 20'a of the washer 20 'a rotationally fixed connection between the bearing end 14'b with the associated sun gear 14th 'And the washer 20' results.

Above the arrangement described above is then - as already clearly stated above - the cap-shaped rotary handle 8 'arranged. Between this twist grip 8 'and the washer 20' is now again a non-rotatable connection in so far that - in the same way as in the first example or in the embodiment according to EP-A-255 869 - a limited free travel is maintained to the Pawl device with pawl 21 'and toothed ring 23' already explained earlier to activate or release. The aforementioned rotational connection or the free travel between the rotary handle 8 'and the washer 2' is in turn ensured that from the inside of the rotary handle 8 'protrudes 24' axially inwards and engages in a matching ring segment-like recess 25 ', such as it can be clearly seen in FIGS. 6 and 9. Fig.6 also reveals that the central upper end 20'b of the washer 20 'can also simultaneously provide further guidance of the rotary handle 8' by axially projecting an annular projection 8'c on the inside and the central upper end 20'b of the washer 20 'overlaps accordingly. At the same time, this ring-like projection 8'c can be designed and engaged with the pawl 21 'that it acts on this pawl 21' for the purpose of activating and releasing the pawl effect accordingly from above.

Even if the use of the twist lock according to the invention on a ski boot has been explained at the beginning with reference to FIG. 1, it should be emphasized that this twist lock according to the invention can also be used extremely effectively and practically for other sports shoes, for example for marathon and other running shoes (e.g. also so-called jogging shoes), tennis shoes as well as a large variety of sporty casual shoes.

Claims (17)

1. Twist lock for a sports shoe containing a) a pull rope arrangement (3) which interacts with two closing flaps (1a) of the shoe (1) which are to be contracted, b) a rope pulley (5, 5 ') rotatably mounted in a housing (9, 9') on the shoe for winding and unwinding the pull rope arrangement, c) an actuating device (8, 8 ') for rotating the sheave,
characterized by the following features: d) the pull rope arrangement consists of a single pull rope (3); e) coaxial to the sheave (5, 5 ') is rotatably mounted in the housing (9, 9'), a stop element (28, 28 ') which is carried by the sheave after a first rotation and after a further rotary movement, which is preferably is slightly less than a full revolution, comes to rest on the housing and thereby limits the rotational movement of the pulley. 2. Twist lock according to claim 1, characterized in that one end (3a) of the single traction cable (3) is fastened to a part (4a) of the shoe upper (4) and the other end (3b) of the traction cable to the sheave (5) is attached while the dazwi The leg-lying section (3c) of this traction cable is guided over the closing flaps (1a) of the shoe (1) to be contracted. 3. Twist lock according to claim 1, characterized in that the cable pulley (5, 5 ') is freely rotatably mounted on a central bearing pin (14a) which projects downwards relative to the cable pulley, and that at the lower pin end (14a') this bearing pin at the same time the middle section (28a) of the stop element (28, 28 ') is freely rotatable. 4. Twist lock according to claim 3, characterized in that in the underside of the pulley (5, 5 ') receiving housing (9, 9') an outer, annular groove (30, 30 ') is incorporated, which is approximately over the extends over the entire circumference of the housing and into which an axially upward-facing stop projection (28b, 28'b) of the stop element (28, 28 ') engages, this stop projection projecting at one of the circumferential ends when the stop element rotates in one or the other direction of rotation ( 30a, 30b) of the annular groove comes to rest. 5. Twist lock according to claim 4, characterized in that the stop element is designed in the form of a stop arm (28, 28 ') extending essentially radially outwards from the central bearing pin (14a), which has the axial stop projection at its radially outer end ( 28b, 28'b) carries, and that from the underside of the sheave (5, 5 ') a driving stop (31, 32a) protrudes downward, which after about the first rotation of the Rope pulley on one or the other side (28c, 28d, 28'c, 28'd) of the stop arm (28, 28 ') comes to rest and takes this stop arm with it during a further rotary movement. 6. Twist lock according to claim 5, characterized in that the central portion (28a) of the stop element (28) is secured by means of a securing element (29) on the outermost lower pin end (14a '). 7. Twist lock according to claim 5, characterized in that an annular groove (36) is incorporated at the outermost lower pin end (14a ') and on this annular groove the central portion (28'a) of the stop element (28') is arranged in the manner of a snap connection. 8. Twist lock according to claim 5, characterized in that the driving stop (31) is attached as an approximately block-shaped approach to the underside of the sheave (5). 9. Twist lock according to claim 5, wherein the traction cable end (3b ') is fixed by means of an approximately pin-like nipple (32) on the sheave (5'), characterized in that the driving stop by one of the underside of the sheave (5 ') after protrusion (32a) of the traction cable nipple (32) formed below. 10. Twist lock according to claim 9, characterized in that the nipple projection (32a) has a cap formation (33) on its outer free end, which, when interacting with the stop arm (28 ') partially engages under it from below, this stop arm on both sides (28'c, 28'd) each having a bulge (34, 35) for the appropriate engagement of the nipple projection. 11. Twist lock according to claim 4, wherein the housing (9, 9 ') covered by a cover (12, 12'), arranged with a latch device (21, 21 ') provided with an intermediate washer (20, 20') above the cover, Above the washer, the rotary actuator (8, 8 ') for the pulley (5, 5') attached and in the area between the housing cover and the pulley to drive this pulley, a planetary gear (14, 17, 18, 14 ', 17', 18th ') Is provided, the sun gear (14, 14') rotatably connected to the rotary actuating device while maintaining a limited free travel and is freely rotatably mounted in the housing cover, characterized in that the sun gear (14, 14 ') has a downwardly extending, pivot-like has an axial extension (14a, 14'a) which forms the central bearing pin for the sheave (5, 5 ') and the central section (28a, 28'a) of the stop element (28, 28'). 12. Twist lock according to claim 11, characterized in that the rotary actuating device is designed as a cap-shaped rotary handle and is screwed to a bearing pin end (14b) of the sun gear (14) which extends axially upward through the housing cover (12), the lateral peripheral wall (8b) of the rotary handle the intermediate disc (20) and - at least partially - covers the housing (9) and its cover (12) so as to protrude downwards. 13. Twist lock according to claim 11, characterized in that a) the rotary actuating device is designed as a closed, cap-shaped rotary handle (8 '), b) on the inside of the peripheral wall (8'b) of this rotary handle (8 ') at least one snap connection element (41) with a radially inwardly pointing hook formation (41a) is provided, which with a suitable outer peripheral groove (42) on the housing cover ( 12 ') is in snap engagement, this outer circumferential groove (42) at the same time forming a rotary guide groove for the snapped hook formation and the associated rotary handle (28'), and c) the sun gear (14 ') has an axially upwardly extending, substantially cylindrical bearing end (14'b) which has a circumferential flattening (43) on its end section which axially penetrates the intermediate disk (20'), this end section being rotatably fixed in a correspondingly shaped central bore (20'a) of the intermediate disc (20 ') is received. 14. Twist lock according to claim 11, characterized in that the essential closure parts at least are partially made of metal, especially light metal. 15. Twist lock according to claim 11, characterized in that the essential closure parts are made of castable and machinable plastic. 16. Twist lock according to claim 15, characterized in that at least the housing (9 ') and the housing cover (12') are made of plastic, that at least two rivet projections (38) projecting from the other part are provided on one of these two parts, which correspond to two matching rivet receiving holes (39), and that the housing (9 ') and housing cover (12') are connected to one another by ultrasonic riveting. 17. Twist lock according to claim 1, characterized in that on the lower outer peripheral edge of the housing (9 ') at least two snap hooks (37) distributed over the circumference for fastening the twist lock (2') are formed on a sports shoe.

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