Self-locking binding for telemark ski, touring ski or cross-country ski

Abstract

A binding for a touring ski, a Telemark ski or a cross-country ski having step in automatic locking. The binding includes a front retaining element to cooperate with the front sole of a boot, a rear retaining element to cooperate with the rear part of the front sole and/or the rear sole of the boot, a tensioning element to tension the boot on the binding and to enable the heel to be freely lifted, a tensioning link placed under and connected to a rear retaining stirrup, and a fixed or retraction stop to cooperate with the tensioning link so as to enable the rear retaining stirrup to move back, tensioning the tensioning element, when the heel of the boot exerts a downwardly directed pressure on the rear retaining boot situated in an idle position.

Claims

1. A ski binding to fix a ski to a ski boot having a front sole and a heel, the ski binding comprising: a front retaining element configured to cooperate with the front sole of the ski boot; a rear retaining element configured to cooperate with a projection on a rear part of the front sole and/or with a rear sole of the ski boot and pivot in a vertical plane about a horizontal axis orthogonal to a direction of the ski, between an upper or idle position, and a lower or engaged position; a tensioning element configured to act between the rear retaining element and the ski and/or the front retaining element to tension the ski boot on the ski binding and also enable the heel of the ski boot to be freely lifted; a tensioning link configured for placement under and connected to a rear retaining stirrup of the rear retaining element, and also configured to enable pivoting of the rear retaining stirrup in a vertical plane about a horizontal axis orthogonal to the direction of the ski; and a retraction stop configured for placement on the ski or the front retaining element to cooperate with the tensioning link and abut thereon in a removeable manner at a point located in front of a pivot axis that connects the tensioning link and the rear retaining stirrup, in a direction of movement of the ski, to enable the rear retaining stirrup to move rearwardly and thereby tension the tensioning element when the heel of the ski boot exerts a downwardly directed pressure on the rear retaining stirrup situated in the idle position.

2. The ski binding of claim 1, wherein a rear part of said rear retaining stirrup is connected to a rear part of said tensioning link.

3. The ski binding of claim 1, wherein said tensioning link, when the rear retaining element is engaged, abuts against said retraction stop with a front end thereof.

4. The ski binding of claim 1, wherein, when the rear retaining stirrup is released from a retraction tension and when the projection of the rear part of the front sole, or the heel of the ski boot, is inserted in the rear retaining stirrup, the projection or the heel of the ski boot bears on a tongue of the tensioning link, and locks said tensioning link in the retracted position.

5. The ski binding of claim 1, wherein, when the ski boot is received in the rear retaining element, after locking of the front retaining element on the front part of the front sole and the heel is lowered, the rear sole bears directly or indirectly on the rear retaining stirrup, and imposes a retraction of the rear retaining stirrup under the effect of the tensioning link, which is in abutment on the fixed retraction stop, so that the retraction of the rear retaining stirrup enables the projection or heel of the ski boot to be inserted in the rear retaining stirrup.

6. The ski binding of claim 1, wherein the rear retaining element comprises a retraction protrusion arranged at a rear of the fixed stop, or integrated in the tensioning link, and which is configured to release the tensioning link from its abutment on the retraction stop when the projection or the heel of the ski boot is inserted in the rear retaining stirrup.

7. The ski binding of claim 1, wherein said tensioning element comprises: elastic return members disposed on either side of the rear retaining element and inside the rear retaining stirrup; at least one ring to adjust a preloading of the tensioning element; and a set of rods and cables that cooperate with said elastic return members to tension the retaining stirrup.

8. The ski binding of claim 1, further comprising a control element including a latch that, when actuated, enables the rear retaining stirrup to be held in a retracted position to prevent the projection or heel of the ski boot from being hooked by the rear retaining stirrup, by acting directly on the rear retaining stirrup or the tensioning link.

9. The ski binding of claim 1, wherein said rear retaining stirrup comprises lateral stops, disposed on either side of a rear part thereof, to center the rear projection of the front sole of the ski boot on said rear retaining stirrup, said lateral stops being disposed so as to enable each to pivot about a vertical axis under effect of a torque generated by a lateral movement of the ski boot when the ski is removed.

10. The ski binding of claim 1, further comprising a spindle to connect the tensioning link to the tensioning element or the rear retaining stirrup, wherein the spindle is situated in a plane of said tensioning element, enabling the rear retaining stirrup to slide parallel to the plane of said tensioning element.

11. The ski binding of claim 1, wherein the tensioning link is to contact the retraction stop at a bearing point situated in front of a connection point between the tensioning link and the retaining stirrup, in reference to a direction of movement of the ski.

12. The ski binding of claim 1, wherein the tensioning link is mounted so as to pivot on the rear retaining stirrup about the pivot axis orthogonal to the direction of the ski.

13. The ski binding of claim 12, wherein the tensioning link is to contact the retraction stop at a point situated in front of said pivot axis of the tensioning link, in reference to the direction of movement of the ski.

14. The ski binding of claim 1, wherein the rear retaining element comprises a front part that is free to pivot with respect to the front retaining element about a transverse axis, while being translationally connected with respect to the front retaining element, the rear retaining stirrup having a degree of freedom in translation with respect to the front part along the longitudinal axis of the ski.

15. The ski binding of claim 1, wherein the rear retaining element comprises a removable fixing device to remove fixing of blades which are to pivot with respect to the rear retaining element about a transverse axis.

16. The ski binding of claim 15, wherein the removable fixing device comprises a fixing member to delimit a housing, configured to receive, by lateral sliding, a pivoting rod secured to said blades.

17. The ski binding of claim 1, further comprising: a heel block; a support upon which the heel-block is moveably mounted; a support housing for the support; and a sensor received in the housing.

18. The ski binding of claim 17, wherein the heel block is moveably mounted so to move between an access position to allow access to the support housing for receipt of the sensor, and a covering position which prevents access to this housing while protecting the sensor.

19. The ski binding of claim 1, further comprising: a control element to control the front retaining element; and a locking member to lock the control element, and which is to move between a neutral position in which the locking member does not interfere with movement of the control element, and a locking position in which the locking member prevents movement of the control element in order to prevent unwanted disengagement of the ski boot with respect to the front retaining element.

20. The ski binding of claim 19, wherein the locking member is configured to extend through a recess in the control element, and includes a locking zone to come into abutment against the walls of the recess in the locking position.

Description

DRAWINGS

(1) FIGS. 1 to 22 illustrate embodiments of the invention.

(2) FIGS. 1, 2, 4, and 5 show the binding in the idle position (ready to be occupied by the boot): FIG. 1 shows a perspective view, FIG. 2 a plan view, FIG. 4 a side view, FIG. 5 a lateral view in cross section.

(3) FIG. 3 shows an exploded view in perspective of the binding that makes it possible to view all the parts that make up the equipment.

(4) FIG. 6 shows a lateral view in cross section of the binding in the idle position with the boot already held by the front retaining stirrup.

(5) FIGS. 7 and 8 depict a lateral view in cross section of the binding that shows the boot being gradually inserted in the rear retaining element, before the tensioning ring is retracted. In FIG. 7 the boot is beginning to be inserted in the rear retaining element, in FIG. 8 the boot is inserted in the rear retaining element.

(6) FIG. 9 shows the same cross section as FIGS. 7 and 8, with the boot engaged in the locked position.

(7) FIG. 10 shows a lateral view in cross section of the binding with the boot in the tourist ski or cross-country ski position.

(8) FIG. 11 illustrates two embodiments of the retraction protrusion, which is an optional element of the invention.

(9) FIG. 12 shows an exploded view in perspective of another embodiment of the binding that makes it possible to view all the parts that make up the equipment.

(10) FIG. 13 shows a lateral view in cross section of the binding according to a variant of the invention, with the boot in the touring ski position.

(11) FIG. 14 shows a lateral view of the binding according to the same variant as that of FIG. 13, with the boot in the Telemark position.

(12) FIG. 15 shows a detail of the device shown in FIGS. 1 to 3, the functioning of which it illustrates.

(13) FIG. 16 shows a detail of the device shown in FIGS. 12, 13 and 14, the function of which it illustrates.

(14) FIGS. 17 and 18 are perspective views illustrating a mounting member for blades, respectively in exploded view and in the mounted position.

(15) FIGS. 19 and 20 are perspective views illustrating a heel block equipping the binding, in the respectively lowered and raised positions.

(16) FIGS. 21 and 22 are perspective views illustrating a locking link equipping the binding, in the respectively neutral and locking positions.

DESCRIPTION

(17) In this description the expressions front, rear, in front of, behind, advances and retracts refers to the direction of the ski in the normal situation of use.

(18) As illustrated in FIGS. 1 and 2, the binding 1 according to the invention comprises a front retaining element 2, a rear retaining element 3 and a heel block 4. These three elements are fixed to the ski, typically by fixing screws 17, directly or by means of a fixing plate.

(19) The main function of the heel block 4 (visible in particular in FIG. 9) is to allow the positioning of the heel of the boot on a support surface 41 at a given height; the heel block is fixed to the ski by means of a support 40; it may comprise in a known manner a chock 43 (referred to as the top chock).

(20) The front retaining element 2 is known as such; it may advantageously be a known front retaining element of the so-called Dynafit binding comprising two conical lugs 20a, 20b that each cooperate with a hollow conical insert 23 situated on the right and left side of the front part of the front sole 11 of the boot 5. The front retaining element 2 in the open (disengaged) position is actuated by the forward movement of the tip of the front sole of the boot 5, by means of the front link 21, as will be described below. The lugs 20a, 20b are each mounted on a clamp 24, which is actuated by the front link 21; in the engagement position of the front retaining element 2, these clamps 24 move the lugs 20a, 20b laterally closer to the front part 14 of the front sole 11, so as to enable the lugs 20a, 20b to be inserted in said hollow inserts 23. Thus the front retaining element 2 makes it possible to hold the boot 5 in a position which, when the rear sole 13 of the boot 5 is not retained in a low position and can be raised, allows easy tilting of the front part 14 of the front sole 11 about a horizontal axis, orthogonal to the long direction of the ski; this axis passes through the lugs 9a, 9b.

(21) Any other type of front retaining element 2 that allows easy tilting of the front part 14 of the front sole 11 about the horizontal axis, orthogonal to the long direction of the ski, can be used in the context of the present invention. Preferably, this front retaining element 2 is designed so as to allow disengagement of the front part 14 of the front sole 11 of the boot 5, by a control element (typically a latch) 26 actuated by the skier by hand or with pressure from the tip of the pole. In the example of the front retaining element of the Dynafit type, in order to disengage the boot from the front retaining element 2, the front retaining element 2 can be actuated by a control element (here a latch) 26 that actuates a front link 21; said control element (latch) 26 can be actuated by the skier by hand or by exerting a substantially vertical pressure with the tip of his pole; in order to easily accept this tip of the pole, the latch 26 may have a hollow zone 22. This actuation, manual or with the pole, causes the opening of the front retaining element 2, which releases the front sole 11 of the boot 5.

(22) It is on the retaining element 3 that the present invention is based. It first of all comprises a front part 3A, which is free to pivot with respect to the front retaining element 2, about a transverse axis, while being translationally connected with respect to it. The rear retaining element 3 moreover comprises a rear retaining stirrup 7, having a degree of the freedom in translation with respect to the front part 3A, along the longitudinal axis of the ski. This translation movement, from rear to front, takes place counter to a tensioning element described below. This rear retaining stirrup 7 is connected to a link 6 referred to as the tensioning link, namely this link can pivot with respect to this stirrup about a transverse axis A6. In addition, said rear retaining stirrup 7 is, in its rear part, secured to the rear attachment clamp 8 able to attach to the rear projection 46 of the front sole 11. The rear retaining element 3 moreover comprises a tensioning element 35 mentioned above, which typically comprises at least one spring 31 (or other elastic return member) and one or more transmission elements, for example a system comprises rods 32 and at least one cable 33 (visible in FIG. 3).

(23) The rear retaining stirrup 7 can tilt between a high position referred to as the idle position, illustrated in FIGS. 4 and 5, and a low position referred to as the locked position illustrated in FIG. 9. This tilting is guided by a link 6 referred to as the tensioning link positioned on the rear retaining stirrup 7. The rear part of the rear retaining stirrup 7 is movably connected to the rear end of the tensioning link 6. The front end 74 of the tensioning link 6 can be engaged in a fixed stop 16, fixed to the ski. When the skier lowers the heel 12 of his boot 5, this downward vertical movement engages the front end 74 of the tensioning link 6 in the stop 16 and causes the retraction of the rear retaining stirrup 7. This retraction movement tensions the tensioning element 35; it allows the engagement of the rear projection 46 of the front sole 11 by the rear attachment clamp 8 of the rear retaining stirrup 7.

(24) In addition to the front retaining element 2 and the rear retaining element 3, FIG. 3 shows the various components that form the tensioning element 35: the rods 35 and the cable 33, as will be explained below.

(25) The tensioning link 6 can be equipped with an elastic return member (typically a spring) 18 that presses it downwards.

(26) We now give a precise description of the functioning of the binding 1 according to the invention, and in particular its rear retaining element 3, referring in particular to FIGS. 6 to 9.

(27) In the idle position of the binding 1, the front retaining element 1 is in the open position (for example, in a front retaining element 1 of the Dynafit type, the flanges 24 are open), and the tensioning link 6 and the rear retaining stirrup 7 are in the high position (raised position): the idle position is the position in which the binding 1 is ready to have the boot inserted. FIG. 6 shows more particularly the idle position for the rear retaining element 3 according to the invention.

(28) When the user has engaged the front retaining element 2 (that is to say, in the example of the Dynafit retaining element described above: locks the front clamps 24 by means of the lugs 20a, 20b, which cooperate with the hollow inserts 23 of the boot 5), he merely needs to lower his heel 12 in order to lock the boot 5 in the rear retaining element 3 according to the invention. When the skier lowers the heel 12 of his boot 5, the rear sole 13 of the boot 5 bears on an interface piece (not shown in the Figures) or directly on the rear retaining stirrup 7 and in fact forces the tensioning link 6 to bear on the fixed stop (also referred to as the retraction stop) 16 (see FIG. 7). The link bears on this fixed stop, at a point that is situated in front of the pivot axis A6 of this link 6, in side view and with reference to the direction of movement of the ski.

(29) Under the vertical force imposed by the boot, the link 6, in abutment on the retraction stop 16, exerts a horizontal force on the rear retaining stirrup 7 directed towards the rear. This imposes a retraction movement on this stirrup with respect to the front part 3a of the rear retaining element 3. This retraction movement of the rear retaining stirrup 7 takes place counter to the tensioning element 35 of the rear retaining element 3, namely this tensioning element is actuated. (This advance and retraction movement of the rear retaining stirrup 7 can be noted in FIGS. 6 to 10 by the extent of the space represented by the arrow E). More precisely, this retraction movement tensions the internal springs 31 of the binding. The retraction movement of the rear retaining stirrup 7 continues until the projection 46 of the rear part of the front sole is inserted in the rear attachment clamp 8 (FIG. 8).

(30) When the rear retaining stirrup 7 arrives in the retracted position, enabling the boot 5 to be inserted (in an advantageous embodiment of the rear retaining element 3 this will enable the projection 46 to be engaged by the rear attachment clamp 8), a suitable protuberance of the protrusion 10 type situated on the ski or an element 76 of the binding, such as for example on the retraction stop 16, retracts the tensioning link 6 by exerting an upwardly directed force on the front part of the tensioning link 6. This retraction of the link 6, which typically takes place about a horizontal axis 19, releases the retaining stirrup 7 from the retraction tension. The retaining stirrup 7, under the effect of the tension of the tensioning element 35, returns to the idle position and tensions the boot 5. In this situation the boot 5 is locked on the ski binding 1, and the skier can devote himself to Telemark skiing, knowing that the rear sole 13 of the boot 5 remains fixed in the rear retaining stirrup 7 and can be lifted by tilting it upwards; this movement will be more effective with a Telemark ski boot, the shell of which, in particular on the front part, is sufficient flexible.

(31) In one embodiment, the fixed stop 16 is fixed to the ski. In another embodiment it is secured to the front retaining element 2.

(32) In order to release the skis, the skier will simply have to release the part of the front sole 11 of the boot 5 held by the front retaining element 2, typically by exerting a vertical pressure with his pole on the latch 26. In the case of the front retaining element 2 of the Dynafit type described above, when the skier actuates the control element 26 (in the example, when the skier presses on the latch 26), the clamps 24 separate on either side of the front sole 11, thus releasing the front part 14 of the front sole 11 by disengaging the lugs 20a, 20b, releasing the front tip of the boot. Since the boot 5 is no longer held, the skier merely needs to move his boot forward slightly in order to disengage the heel or the projection 46 and to remove his boot 5 from the binding 1.

(33) When the projection 46 of the front part 15 of the front sole 11 is inserted in the rear clamp, it bears on the tongue 36 of the link 6 and locks it in the retracted position.

(34) In an embodiment illustrated in FIGS. 5 to 9, a retraction protrusion 10 is provided on the tensioning link 6, which reinforces the tension of the tensioning element 35 of the rear retaining element 3.

(35) According to a particular embodiment, the tension springs 31 of the tensioning element 35 are integrated in the rear retaining stirrup 7.

(36) In one embodiment, the rear retaining element 3 is able to pivot, by raising or lowering its rear part, in the vertical plane about a horizontal axis orthogonal to the direction of the ski between a top position and a bottom position. This axis may be a physical axis and/or a virtual axis. A virtual axis may be represented by a flexible material, in this case a flexible connection element 30 formed on its front part 3A. A flexible connection element may have, during functioning thereof, a generalized and/or localized deformation, for example by means of one or more grooves 75 (see FIGS. 3 and 4), and/or may be fixed at its front end by a spindle 37.

(37) In an embodiment illustrated in FIGS. 3 and 4, the dimensions of the flexible connection element 30 are chosen so as to guarantee that the rear retaining stirrup 7 is in a position such that the tensioning link 6 is placed downstream of the fixed stop 16.

(38) In an embodiment illustrated in FIG. 10, the ski binding 1 according to the invention comprises a control element 45 able to be actuated by the user, said control element 45 making it possible to impose on the rear retaining stirrup 3 a position that is sufficiently retracted to prevent the projection 46 or the heel 12 from being hooked by the rear retaining stirrup 7, either by acting directly on the rear retaining stirrup 7 or by acting directly on the tensioning link 6. Said control element 45 may be a latch.

(39) This makes it possible to pivot the rear sole 13 of the boot 5 freely upwards; the boot 5 being held solely by the front retaining element 2. This pivoting movement is represented by the double arrow in FIG. 10. This position is suitable for practicing cross-country skiing or touring skiing.

(40) The control element or latch 45 may advantageously be disposed between the rear retaining element 5 and the heel block 4.

(41) As mentioned above and illustrated in FIG. 11, the retraction protrusion 10, which is optional, may be situated either on the ski or on the base 76 that comprises the retraction stop 16, as shown in FIG. 11a (as well as in FIGS. 5, 6, 7, 8 and 9), or it may be integrated in the tensioning link 6, as illustrated in FIG. 11b. In the latter case it may be a protuberance directed downwards that cooperates with the surface of the base 76, or any other equivalent system.

(42) FIGS. 12 to 14 and 16 illustrate five variants of the invention that can be implemented separately or, as in the embodiment shown in FIG. 12, together:

(43) In a first variant, the flexible connecting element 30 includes a guide 29 that slides in the slide of the rear retaining stirrup 7. The guide 29 stiffens the lateral holding: it can be produced from plastics material. In particular, this variant has the advantage of providing better lateral stability of the boot 5 when the ski is removed, when the front part of the boot is no longer held by the front retaining element 2.

(44) In a second variant, the functioning of which is illustrated in FIG. 14, in the tensioning element 35 the cables are replaced by an arch 77; this makes it possible to control the point of inflection of the boot.

(45) In a third variant illustrated in FIG. 16, in the front retaining element 2, the clamps 24a, 24b have a support surface 78a, 78b for the front part 15 of the front sole 11.

(46) In a fourth variant, the function of which is illustrated in FIGS. 13 and 14, the cooperation between three components of the front retaining element 2, namely the touring mode control latch 49, the slide 47 and the touring pivot assembly 50 enables the user to switch from touring skiing mode (FIG. 13) to the Telemark mode (FIG. 14) and vice versa without removing the skis. This fourth variant represents an innovative modification of the front retaining element 2; it offers a novel functionality that will be explained below in relation to FIG. 16.

(47) The touring-mode control latch 49 is dissociated from the front link 21 but still provides the function of locking the front link 21 for touring mode but now it makes it possible to slide the slide 47 from front to rear in order to release or lock the touring pivot assembly 50.

(48) The touring pivot assembly 50 that was locked by the touring slide 47 can now pivot about two axes (82), see FIG. 16f. When the binding is in Telemark mode, the user can pivot the element 49 forwards, a protuberance on the part bears on the slide 47 and slides it towards the rear, actually releasing the touring pivot assembly 50. This released assembly enables the skier to easily lift the boot in order to practice touring skiing as described in FIG. 13. The user (the skier) can thus switch into touring skiing mode without removing the skis.

(49) Moreover, it is noted that, in FIG. 12, the plate 27 was produced in two pieces 27, 27a. In this sub-variant, the main body 27 is placed on a chock (for example made from plastics material) 27a that integrates guides in the middle part in order to hold the slide 47 during sliding. This sub-variant limits the machining cost.

(50) It should be noted that the embodiment in FIG. 12 does not show the presence of the retraction protrusion 10 but ithe latter may be added.

(51) In a fifth variant, the front link (here denoted 21) and its latch (here denoted 26) are secured together.

(52) FIG. 15 illustrates in another way the embodiment in FIGS. 1, 2 and 3.

(53) FIG. 15a shows the binding in the open position, awaiting the boot. The clamps 24a, 24b are open and the front link 21 is in the top position.

(54) FIG. 15b shows the binding in the boot in forward engagement position; this is the Telemark position. The front link 21 has tilted downwards; the latch 26 has followed the tilting of the front link 21 (these two parts being connected by a pivot and a position-locking system) caused by the engagement of tip of the boot.

(55) FIG. 15c shows the binding in the touring position. The latch 26 had been tilted by the skier by hand (typically by a pressure of the tip of the pole on a hollow zone 22 of the latch 26) and bears on at least one support protuberance 48 (here: two support protuberances 48a, 48b. The binding is locked and the skier can no longer remove the skis in this position).

(56) FIG. 16 illustrates in a different way the embodiment in FIGS. 12, 13 and 14.

(57) FIG. 16a shows the front retaining element 2 of the binding in the open position, awaiting the boot. This Figure includes the embodiment in which the front link 21 and its latch 26 are secured together (referred to in the following description as part 21+26).

(58) FIG. 16b shows the binding in the Telemark position. The part 21+26 has tilted downwards with the support surfaces 78a, 78b of the clamps 24a, 24b. The part 49 has not moved; it is independent of the part 21+26. In this configuration of the binding the skier can remove the skis.

(59) FIG. 16c shows the binding in the touring position. The part 49 has been tilted by the skier, typically by vertical downward pressure exerted by the tip of his pole. The binding is locked and the skier can no longer remove the skis.

(60) FIG. 16d shows in more detail the movement of the part 49 and of the slide 49: the lowering of the part 49 causes the retraction of the slide 47 in the direction of the arrow. A support surface 80 of the front link 26 locks the part 2126. When the slide 47 has slid towards the rear, the part 49 is free to pivot upwards. The pivot point for the Telemark mode is close to the clamping point of the boot, and the boot can therefore pivot while greatly limiting the tension of the springs: when the skier lifts his heel, the boot pivots and makes a movement in an arc of a circle. The rear retaining element 3 also pivots about a pivot point and thus makes a movement in an arc of a circle. In Telemark mode (part 49 locked on the ski) this pivot point is distant from the front retaining element 2; this distance causes a high tension in the tensioning element 35 and makes the boot bend. The two arcs of a circle described by the movements of these two elements are distant from each other, and the tensioning element 35 compensates for the distance and thus increases the tension. In tourist skiing mode (part 49 released) the pivot point of the rear retaining element 3 is very close to the front retaining element 2 since the part 49 pivots with the rear retaining element 3 (see FIG. 13). The tension on the boot is lower and the skier can easily lift his heel for tourist skiing.

(61) This variant of the front fixing element 2 therefore allows easy passage from Telemark mode to touring mode and vice versa without removing the boot, by means of a simple action by the tip of the pole on the element 49.

(62) FIGS. 16e and 16f show more clearly the structure and the action of the slide 47 and of the touring pivot assembly part 49. FIG. 16e shows the part 49 in locked mode, FIG. 16f shows the part 49 released, after the slide 47 has released it; in this example, the slide cooperates for this purpose with a recess 81 provided in the part 49. The latter can pivot about an axis 82.

(63) In FIGS. 1 to 10, 11b, 12 to 14 and 16, screws 17 for fixing the various elements on the ski appear, but the ski 28 is shown only in FIG. 11a.

(64) The boot 5 has been described here as comprising a front sole 11 and a rear sole 13, these two parts being separated by the projection 46. In the context of the present invention, the projection 46 may also be produced in the form of a channel or any other hollow provided in the sole of the boot, in which case the protection 46 is, in the context of the description, said to belong to the front sole 11, the edge of the rear part 15 of which it represents; the rear sole 13 is in this case represented by the part of the sole that extends from the projection 46 as far as the rear end of the sole (referred to as the heel 12).

(65) FIGS. 17 and 18 illustrate an additional embodiment of the invention, in which the flexible connecting element 30 has in it two orifices 83, intended for cooperation with a mounting member for blades. More precisely, this mounting member 84 has two fingers 85 intended to enter the aforementioned orifices 83, said fingers being able to cooperate with locking means, not shown, of any suitable type.

(66) The member 84 further comprises a mounting housing 86 delimited by three protrusions, namely a first middle protrusion 87, facing two lateral protrusions 88. The opposite faces of these protrusions have a rounded surface, whereas these protrusions are advantageously produced from a material having a certain elasticity. The mounting zone 86 can therefore accept, removably, blades 90 such as those sold by the name Dynafit. For this purpose, these blades are connected, via tabs 91, to a transverse rod 92 able to be received in the housing 86.

(67) When the user has to follow a tricky passage, in particular on a glacier, he inserts the rod 92 in the housing 86, in particular by lateral sliding. The blades can then pivot with respect to the flexible element, about the axis of the transverse rod 92, in the direction of the arrow F92. The user next engages his boot in the front retaining element 2, as described above, so that the blades cannot become disconnected in an unwanted fashion. If he wishes to remove these blades, the user first of all disengages his boot from the front retaining element and then extracts the rod 92 out of the housing 86.

(68) FIGS. 19 and 20 illustrate yet another additional embodiment of the invention, in which the heel block 4 is mounted so as to be able to move with respect to the support 40, in this case mounted so as to pivot about a transverse axis A4. In addition, the support delimits a housing 94, allowing reception of a sensor 95, of a type known per se. This sensor enables the user to find his ski after a fall, when the ski is in particular lost in powdery snow. This sensor is, by way of example, in accordance with the one sold under the name ResQski.

(69) Before engaging his boot in the front retaining element 2, the user pivots the heel block upwards about the axis A4, so as to access the housing 94. He next inserts the sensor in said housing: advantageously, the latter has walls suitable for removable fixing of the sensor 95, in particular by lateral sliding. It will be noted that this embodiment makes it possible to take advantage judiciously of the free space formed by the heel block. In addition, the top surface of this heel block protects the sensor 95 vis--vis any attack, in particular an unexpected blow from an edge. After use, the user disengages his boot from the front retaining element and then extracts the sensor 95 out of its housing 94.

(70) FIGS. 21 and 22 illustrate yet another additional embodiment of the invention in which the control latch 26 is hollowed out with a recess 100 emerging on both opposite faces. It is moreover provided with an additional link 101, referred to as a locking link, which is mounted so as to pivot about an axis A101, with respect the body of the front retaining element 2. The pivoting of this link 101 can be achieved by pressing on an actuation member 102 (see also FIG. 18) situated on either side of the latch 26. This pressing can be initiated for example by a pole and, because of this, the actuation member is advantageously provided with two hollows, providing easy cooperation with this pole.

(71) The link is able to move between two functional positions. In the first position, illustrated in FIG. 21, this link is turned towards the rear of the ski, so that it does not interfere with the free tilting of the latch 26. In this first position, the user can therefore freely engage and disengage the boot with respect to the front retaining element.

(72) In the second position, referred to as the locking position, illustrated in FIG. 22, this link is turned towards the front of the ski, so that it now prevents the free tilting of the latch 26. Advantageously, the user engages his boot in the first position of the link and then tilts this link into its second position. He can then no longer, when he does not intend to, disengage his boot with respect to the front retaining element. This is because the walls of the recess 100 then come into abutment against a so-called zone 103, belonging to the link 101. The ski can therefore no longer be released, which is particularly suited to a touring mode, so that the ski does not escape in particular in the case of lateral pressing on the ice.

(73) In another embodiment, not illustrated by Figures, it is the heel 12 that is engaged by the rear fixing element 7.

(74) The binding according to the invention has numerous advantages. It can be engaged and disengaged without the skier needing to bend down. In addition it is versatile, robust, reliable and lightweight.

LIST OF REFERENCE SYMBOLS

(75) 1 Binding 2 Front retaining element 3 Rear retaining element 4 Heel block 5 Boot 6 Tensioning link 7 Rear retaining stirrup 8 Rear attachment clamp 9 Knurled ring (9a, 9b) 10 Retraction protrusion 11 Front sole of the boot 5 12 Heel of the boot 5 13 Rear sole of the boot 5 14 Front part of the front sole 11 15 Rear part of the front sole 11 16 Retraction stop 17 Screw for fixing on the ski 18 Spring of the tensioning link 6 19 Spindle of the tensioning link 6 20 Lug (20a, 20b) 21 Front link 22 Hollow zone of the latch 26 23 Hollow insert 24 Clamp 25 Clip holding the link spindle 19 26 Latch of the front link 21 27 Plate of the front retaining element 28 Ski 29 Guide 30 Flexible connecting element 31 Elastic return element (spring) 32 Rod 33 Cable 34 Element for adjusting the pivot tip 35 Tensioning element 36 Tongue of the tensioning link 6 37 Spindles of the connecting element 30 38 Lateral stop 39 Spindle of the lateral stop 38 40 Heel-block support 41 Support surface of the heel block 42 Tilting button 43 Top chock 44 Heel-block spindle 45 Touring locking latch 46 Rear projection of the front sole 11 47 Slide 48 Support protuberance 49 Touring-mode control latch 50 Touring-pivot assembly 70 Safety spring 71 Adjustment screw (tension of the spring 70) 72 Tension indictor 73 Slide 74 Front end of the link 6 75 Groove of the connecting element 30 76 Base (plate) 77 Arch 78 Support surface of the clamp 24 80 Support surface of the front link 81 Recess in the assembly 49 82 Pivot point of the assembly 49 83 Orifices of the element 30 84 Mounting member 85 Fingers of the member 84 86 Mounting housing 87 Middle protrusion 88 Lateral protrusions 90 Blades 91 Tabs of the blades 90 92 Rod of the blades 90 94 Housing of the support 40 95 Sensor 100 Recess in latch 26 101 Link 102 Member actuating 101 103 Locking zone of 101