Heel piece for ski touring with release mechanism

Abstract

A heel piece (1) for ski touring, comprising: - a base (2) with a binding support (21), - a binding body (3) with a binding element (4) having a cylindrical housing (31), a vertical cylindrical stud (215) with an internal vertical cylindrical housing (211) open on the upper part of said vertical cylindrical stud (215), the heel piece (1) with a retaining piece (5) having an upper end (52) disposed within the binding body (3), the heel piece (1) further comprising a cam system between the vertical cylindrical stud (215) and the retaining piece (5), the heel piece (1) further comprising an elastic means (6) for translational constraint configured to exert a retaining force on the retaining piece (5) oriented towards the base (2). Abbreviated figure: Fig 1

Description

Title of the invention: Heel piece for ski touring with release device

[0001] The invention relates to the field of ski bindings and more particularly to the heel pieces of ski bindings for the practice of ski touring, equipped with a release device so as to allow release in the event of excessive stress.

[0002] Skis, and touring skis in particular, generally include a release mechanism to allow the bindings to release in the event of a fall, for example. Such a release helps to limit the risk of injury. In ski touring, and especially in downhill mode, such a release mechanism is located on the heel piece of the ski binding.

[0003] The practice of ski touring favors the use of the lightest possible equipment. This need becomes even more important for competitive ski touring, for which the presence of a release device is recommended but must also allow for the lightest possible binding.

[0004] One of the aims of the present invention is to resolve at least partially the disadvantages of the prior art and to propose a heel piece with an improved release device.

[0005] The present invention therefore relates to a heel binding for ski touring, comprising: - a ski mounting base, said base comprising a mounting bracket, said mounting bracket comprising a vertical cylindrical stud, - a fixing body comprising a fixing element configured to attach to a shoe, said fixing body comprising a cylindrical housing so as to insert said fixing body onto the cylindrical vertical stud of the vertical support, said fixing body being fixed to the fixing support of the base so as to be rotationally mobile around the cylindrical vertical stud and fixed in translation along said cylindrical vertical stud, the cylindrical vertical block comprising an internal cylindrical vertical housing open on the upper part of said cylindrical vertical block, the heel piece comprising a retaining piece having a cylindrical body disposed in the internal housing of the vertical cylindrical block and an upper end disposed within the fixing body, the heel piece also includes a cam system linking the cylindrical vertical block to the retaining piece so that rotation around the vertical axis of the retaining piece relative to the vertical cylindrical stud causes a vertical translation of said retaining piece, the fixing body having a housing at the upper end of the retaining piece of complementary shape to the upper end of the retaining piece so that said retaining piece is rotationally fixed with the fixing body and at least partially free in translation relative to said fixing body within the internal housing of the vertical cylindrical stud, the heel piece further comprising an elastic means of translational constraint configured to exert on the retaining piece a retaining force directed towards the base.

[0006] According to one aspect of the invention, the fastening element comprises two parallel arms extending longitudinally, the first end of which projects forward from the fastening body, each arm comprising a second end connected to each other by a curved portion disposed at the rear so that said fastening element has a general "U" shape, said fastening element being disposed parallel to the base on an upper part of the fastening body.

[0007] According to another aspect of the invention, the retaining piece comprises a vertical internal housing in which the elastic constraining means is disposed, said internal housing comprising an internal shoulder on which rests a lower end of the elastic means, the retaining piece comprising a compression adjustment screw of the elastic means whose head rests on an upper end of the elastic means and the threaded rod is connected to the vertical support so as to constrain the elastic means in compression and exert on the retaining piece a retaining force directed towards the base.

[0008] According to another aspect of the invention, the upper end of the retaining piece comprises a head disposed between the arms of the fixing element, said head comprising a lateral wall inclined in contact with each of the arms of the fixing element, said arms exerting a transverse force in convergent compression on said inclined walls so as to exert on the retaining piece a retaining force oriented in the direction of the base.

[0009] According to another aspect of the invention, the fastening element comprises two parallel branches, a first portion of which is longitudinally projecting forward from the fastening body and a second portion of which is vertically projecting within the fastening body so that said branches have a general "L" shape and are mobile in rotation around the axis formed by their second portion.

[0010] According to another aspect of the invention, the retaining piece comprises a vertical internal housing in which the elastic constraint means is disposed, said housing internal structure comprising an internal shoulder on which rests a lower end of the elastic means the retaining piece comprising a screw for adjusting the compression of the elastic means, the head of which rests on an upper end of the elastic means and the threaded rod is connected to the vertical support so as to constrain the elastic means in compression and exert on the retaining piece a holding force directed towards the base.

[0011] According to another aspect of the invention, the upper end of the retaining piece has a head partially covering the first portions of the arms of the fastening element, said head having two housings whose opening is oriented towards the base and inside of which pass respectively a first portion of the arms of the fastening element, said housings having a lateral wall inclined outwards so that a separation of the first portions of the arms from each other causes a translation of the retaining piece in a direction opposite to the base.

[0012] According to another aspect of the invention, the housing of the upper end fixing body of the retaining piece is open on its upper part.

[0013] According to another aspect of the invention, the upper end of the cylindrical vertical block has at least one rounded lateral notch and the retaining piece has at least one complementary lateral cam of the at least one rounded lateral notch of the vertical support.

[0014] According to another aspect of the invention, the mounting support comprises a base connected with the base by a sliding link so as to have a longitudinally adjustable position relative to the base.

[0015] Other features and advantages of the invention will become clear from the following description, which is by way of example and not limitation, with reference to the accompanying drawings, in which:

[0016] [Fig-1] Fig. 1 is a schematic perspective representation of a heel piece according to a first embodiment,

[0017] [Fig.2] Fig.2 is a schematic cross-sectional representation of the heel piece of the [Fig.l],

[0018] [Fig.3] Fig.3 is a schematic side view representation of the heel piece of the [Fig.l],

[0019] [Fig.4] Fig.4 is a schematic perspective representation of a support vertical,

[0020] [Fig. 5] Fig. 5 is a schematic perspective representation of a part of maintenance according to a first variant,

[0021] [Fig.6] Fig.6 is a schematic representation of the top of the heel piece of the [Fig. 1] during a lateral triggering,

[0022] [Fig.7] Fig.7 is a schematic side view representation of the heel piece of the [Fig. 1] during a lateral triggering,

[0023] [Fig.8] Fig.8 is a schematic representation of the top of the heel piece of the [Fig. 1] during a frontal triggering,

[0024] [Fig.9] Fig.9 is a schematic cross-sectional representation of a heel piece according to a variant,

[0025] [Fig. 10] The [Fig. 10] is a schematic perspective representation of a part maintenance depending on the variant,

[0026] [Fig. 11] Fig. 11 is a schematic representation of the top of the heel piece depending on the variant during a lateral triggering,

[0027] [Fig. 12] Fig. 12 is a schematic representation of the side of the heel piece according to the variant during a lateral triggering,

[0028] [Fig. 13] Fig. 13 is a schematic representation of the top of the heel piece depending on the variant during a frontal triggering,

[0029] [Fig. 14] The [Fig. 14] is a schematic perspective representation of a heel piece according to a second embodiment,

[0030] [Fig. 15] Fig. 15 is a schematic cross-sectional representation of the heel piece of the [Fig. 14],

[0031] [Fig. 16] Fig. 16 is a schematic side view representation of the heel piece of the [Fig. 14] during a lateral triggering,

[0032] [Fig. 17] The [Fig. 17] is a schematic partial cross-sectional representation of the heel piece of the [Fig. 14] during a lateral release,

[0033] [Fig. 18] The [Fig. 18] is a schematic partial cross-sectional representation of the heel piece of the [Fig. 14] during a frontal release,

[0034] [Fig. 19] Fig. 19 is a schematic side view representation of the heel piece of the [Fig. 14] during a frontal triggering.

[0035] In the various figures, identical elements bear the same reference numbers. The following embodiments are examples.

[0036] In this description, certain elements or parameters can be indexed, such as first element or second element, first parameter and second parameter, first criterion and second criterion, etc. In this case, it is simply a matter of indexing to differentiate and name similar but not identical elements, parameters, or criteria. This indexing does not imply any priority of one element, parameter, or criterion over another, and such designations can easily be interchanged without departing from the scope of this description.

[0037] In this description, "front" means an element configured to be positioned as close as possible to the front part of the ski, as close as possible to the toe of a ski boot, or as close as possible to the front toe piece of a ski binding when the ski boot is mounted on the binding. Conversely, "rear" means an element configured to be positioned as close as possible to the rear part of the ski, as close as possible to the heel of a ski boot, or as close as possible to the heel piece of a ski binding when the ski boot is mounted on the binding. "Top" or "upper" also means an element configured to be positioned opposite the lower part of the ski, also called the base, which is configured to make contact with the snow-covered ground.

[0038] The various figures represent a trihedral XYZ in which the arrow X corresponds to a longitudinal direction pointing towards the front of the heel piece 1, configured to be parallel to the axis of the ski. The arrow Z corresponds to a vertical direction pointing upwards and the arrow Y corresponds to a lateral direction of the heel piece 1, intended to be transverse to the ski when the heel piece 1 is mounted on the ski.

[0039] The heel piece 1 is configured to be fixed to a ski (not shown), associated with a front binding, not shown, to form a ski binding.

[0040] As illustrated in Figures 1 to 3, the heel piece 1 has a base 2 for attaching it to a ski (not shown). The base 2 has a flat lower face configured to contact the upper face of a ski. The base 2 may thus have one or more bores 22 oriented along the vertical direction Z. This bore 22 is specifically configured to receive a screw for attaching the base 2, and therefore the heel piece 1, to the ski.

[0041] As illustrated in Figures 1 to 3, the base 2 includes a mounting support 21. The mounting support 21 includes, in particular, a vertical cylindrical stud 215. This vertical cylindrical stud 215 is projecting upwards in the vertical direction Z relative to the base 2. The vertical cylindrical stud 215 includes, in particular, a cylindrical section extending in the vertical direction Z. Figure 4 shows in more detail an isolated mounting support 21.

[0042] The mounting bracket 21 may, in particular, include a base 214 having a sliding connection with the base 2 so as to have an adjustable position longitudinally relative to the base 2. The base 2 may thus include a longitudinal slide 23, and the base 214 of the mounting bracket 21 may cooperate with said longitudinal slide 23. Clamping means may also be provided for fixing the mounting bracket 21 in the desired position along this longitudinal slide 23. For example, holes 216 may be provided in the base 214 through which screws or bolts can pass to cooperate with the base 2.

[0043] A fixing body 3 is arranged on the vertical cylindrical stud 215 of the fixing support 21. The fixing body 3 is thus positioned higher than the base 2. The fixing body 3 includes, in particular, a fixing element 4 configured to attach to a shoe. The fixing body 3 also includes a vertical cylindrical recess 31 to allow the insertion of the fixing body 3 onto the vertical cylindrical stud 215. More specifically, the cylindrical section of the vertical cylindrical stud 215 is inserted into the cylindrical recess 31 of the fixing body 3.

[0044] In order to fix the fixing body 3 to the fixing support 21, the fixing body 3 may, in particular, include a through bore 33, oriented along the Y direction. The fixing body 3 is secured to the vertical support 21 by means of a pin (not shown), housed in the bore 33 and engaging with a groove 213 formed on the cylindrical vertical stud 215. This groove 213 may, in particular, extend into the upper part of the cylindrical vertical stud 215 in a plane parallel to the longitudinal X and transverse Y directions. This makes it possible to hold the fixing body 3 on the vertical support 21 while limiting its translational movements along the vertical Z direction, while allowing its rotation around the cylindrical vertical stud 215 of the fixing support 21 (around the vertical Z direction).

[0045] As shown in particular in [Fig.4], the vertical cylindrical block 215 has an internal cylindrical housing 211 extending vertically, i.e. along the vertical axis Z. This internal housing 211 is open on the upper part of said vertical cylindrical block 215.

[0046] The heel piece 1 further comprises a retaining piece 5, illustrated in particular in [Fig.5], which is inserted into the internal housing 211 of the cylindrical vertical stud 215. This retaining piece 5 comprises a cylindrical body 51, disposed in the internal housing 211 of the cylindrical vertical stud 215, and an upper end 52, 52', projecting from the internal housing 211 and disposed within the fixing body 3.

[0047] The heel piece 1 further comprising a cam system linking the vertical cylindrical pad 215 and the retaining piece 5 such that a rotation about the vertical axis Z of the retaining piece 5 relative to the vertical cylindrical pad 215 causes a vertical translation along the vertical axis Z of said retaining piece 5.

[0048] In the example illustrated in Figures 1 to 9, the upper end of the cylindrical vertical stud 215 has at least one rounded lateral notch 212. More precisely, this at least one lateral notch 212 is located on the edge of the opening of the tube formed by the internal housing 211. The upper end of the cylindrical vertical stud 215 may, in particular, have two diametrically opposed lateral notches 212. The at least one lateral notch 212 of the vertical stud cylindrical 215 can be arranged transversely, that is to say, it is oriented along the transverse axis Y.

[0049] Still according to the example illustrated in figures 1 to 9, the retaining piece 5 has at least one lateral cam 53 complementary to a rounded lateral notch 212 of the cylindrical vertical stud 215. The retaining piece 5 can thus have two lateral cams 53 complementary to the lateral notches 212.

[0050] However, it is quite possible to imagine an inverse embodiment in which at least one lateral notch 212 is provided on the retaining piece 5 and in which at least one cam 53 is provided on the vertical cylindrical block 215. Other cam systems can also be imagined, such as, for example, a grooved cam system.

[0051] Returning to figures 1 to 3, the fixing body 3 has a housing at the upper end 52, 52' of the retaining piece 5 which is complementary in shape to said upper end 52, 52' of the retaining piece 5. This housing is configured in particular so that, within the internal housing 211 of the cylindrical vertical stud 215, the retaining piece 5 is rotationally fixed, around the vertical axis Z, with the fixing body 3 and at least partially free in translation, along the vertical axis Z, relative to the fixing body 3.

[0052] The heel piece 1 also includes an elastic means 6 for translational constraint configured to exert on the retaining piece 5 a retaining force directed towards the base 2.

[0053] The structure of the binding support 21, the binding body 3, the presence of the retaining piece 5, and the elastic means 6 thus cooperate to form a release device for the heel piece 1, particularly for lateral release. Lateral release occurs when the boot or ski is subjected to a lateral force along the lateral axis Y. If this lateral force exceeds the resistance of the release device, then the binding body 3 rotates around the vertical cylindrical pin 215 to an angle at which the boot detaches from the binding element 4.

[0054] The housing of the fixing body 3 of the upper end 52, 52' of the retaining piece 5 can in particular be opened on its upper part so as to allow access to the elastic means 6 or to allow the passage of said upper end 52, 52'.

[0055] The elastic means 6 exerts a constraint force on the retaining piece 5 which makes it possible to hold said retaining piece 5 in place, more particularly so as to hold at least one cam 53 of the retaining piece 5 in at least one lateral notch 212 of the vertical cylindrical stud 215. The fact that the upper end 52; 52' of the retaining piece 5 is complementary to the fixing body 3 links the rotational movements around the vertical axis Z between these two parts. In the event of a lateral force on the ski or boot, the binding body 3 and the retaining piece 5 are subjected to a rotational force around the vertical axis Z. If this rotational force is greater than the holding force exerted by the elastic means 6, the binding body 3 and the retaining piece 5 rotate around the vertical axis Z, causing at least one cam 53 to extend from at least one notch 212 and a vertical translation of the retaining piece, as illustrated in Figures 6, 7, 11, 12, 16, and 17. The force exerted by the elastic means 6 thus determines the force required for lateral release.

[0056] According to a first embodiment illustrated in Figures 1 to 13, the fastening element 4 may comprise two parallel arms 41 extending longitudinally, the first end of which projects forward from the fastening body 3. Each arm 41 has a second end, opposite the first end, connected to each other by a curved portion 43 located at the rear. Thus, the fastening element 4 has a general U-shape. The fastening element 4 is positioned parallel to the base 2 on an upper portion of the fastening body 3. In order to accommodate the arms 41 and secure the fastening element 4 in the vertical direction Z, the fastening body 3 may, in particular, comprise grooves 35 extending in the longitudinal direction X and accessible from the sides of the fastening body 3.Notches can be made in the arms 4L. These notches can receive a pin (not shown) housed in a bore 36 through the fixing body 3 in the transverse direction Y. The fixing element 4 is thus immobilized relative to the fixing body 3 in the longitudinal direction X.

[0057] According to a first variant of the first embodiment, illustrated in Figures 1 to 8, the retaining piece 5 may include a vertical internal housing 54 in which the elastic constraint means 6 is disposed. This internal housing 54 has an internal shoulder 531 (visible [Fig. 2]) on which rests a lower end of the elastic means 6. The retaining piece 5 also includes an adjustment screw 55 for the compression of the elastic means 6. The head of this adjustment screw 55 rests on an upper end of the elastic means 6, and the threaded rod is connected to the vertical support 21 so as to compress the elastic means 6 and exert a holding force on the retaining piece 5 directed towards the base 2. The threaded rod of the adjustment screw 55 can thus pass through the retaining piece 5 and engage with a tapped hole provided on the mounting support 21.

[0058] According to this first variant, the elastic constraint means 6 can thus be, for example, a spring, in particular a helical spring, disposed in the vertical internal housing 54 of the retaining piece and whose compression is adjusted by the adjusting screw 55.

[0059] According to a second variant of the first embodiment illustrated in Figures 9 to 13, the upper end 52 of the retaining piece 5 may include a head disposed between the arms 41 of the fastening element 4. The head has an inclined lateral wall 521 in contact with each of the arms 41 of the fastening element 4. The arms 41 then exert a convergent transverse compressive force on said inclined walls 521 so as to exert on the retaining piece 5 a holding force directed towards the base 2.

[0060] According to this second variant, the elastic stress means 6 is exerted directly by the arms 41 of the fastening element 4. The stress force exerted by the elastic stress means 6 is thus adjustable only by replacing the fastening element 4 with a wider spacing between the arms 41 to decrease this stress or a narrower spacing to increase it. As illustrated in [Fig. 1 1], during lateral release, there is a vertical translation of the fastening body 3 as well as a widening of the arms 41 of the fastening element 4 due to the vertical translation of the retaining piece 5.

[0061] Whether for the first or second variant, and as illustrated in Figures 8 and 13, a frontal release, that is to say, a release due to a violent upward movement of the heel of the shoe, for example by a fall forward, is achieved by the transverse separation of the arms 41 from each other. Only the resistance to separation of the fastening element 4 itself allows control of the frontal release force.

[0062] According to a second embodiment illustrated in Figures 14 to 19, the fastening element 4 comprises two parallel arms 41', a first portion 411 of which extends longitudinally and projects forward from the fastening body 3. A second portion 412 of the two parallel arms 41', opposite the first portion 411, extends vertically within the fastening body 3, such that the arms 41' have a general "L" shape and are rotationally movable, relative to the fastening body 3, about the axis formed by their second portion 412. This axis formed by their second portion 412 may, more particularly, be vertical and thus extend along the vertical axis Z.

[0063] Similar to the first variant of the first embodiment, in this second embodiment, the retaining piece 5 may include a vertical internal housing 54 in which the elastic constraint means 6 is disposed. This internal housing 54 has an internal shoulder 531 (visible [Fig. 15]) on which rests a lower end of the elastic means 6. The retaining piece 5 also includes an adjustment screw 55 for compressing the elastic means 6. The head of this adjustment screw 55 rests on an upper end of the elastic means 6, and the threaded rod is connected to the vertical support 21 so as to compress the elastic means 6 and exert on the retaining piece 5 a retaining force directed towards the base 2. The threaded rod of the adjusting screw 55 can thus pass through the retaining piece 5 and engage with a tapped hole provided on the fixing support 21.

[0064] The elastic constraint means 6 can thus be, for example, a spring, in particular a helical spring, disposed in the vertical internal housing 54 of the retaining piece 5 and whose compression is adjusted by the adjusting screw 55.

[0065] According to the second embodiment, the upper end 52' of the retaining piece 5 may include a head partially covering the first portions 411 of the arms 41' of the fastening element 4. By covering, it is understood here that the head covers the upper part of the arms 41' as well as at least the outer lateral part of the arms 41'. The head 52' has two recesses 522 whose openings are oriented towards the base 2 and inside which a first portion 411 of the arms 41' of the fastening element 4 pass respectively. These recesses 522 have a lateral wall 523 inclined outwards such that a separation of the first portions 411 of the arms 41' from each other causes a translation of the retaining piece 55 in a direction opposite to the base 2.

[0066] As illustrated in Figures 18 and 19, for a frontal release, the first portions 411 of the arms 41' move apart from each other by rotation around their second portion 412. As they move apart, the first portions 411 come into contact with the lateral walls 523 of the housing 522. As they continue to move apart, the first portions 411 exert a force on the lateral walls 523 causing an upward translation of the retaining piece 5 in opposition to the stresses exerted by the elastic constraint means 6. According to this second embodiment, the elastic constraint means 6 also allows the stresses to be adjusted for a frontal release.

[0067] Thus, it is clear that the heel piece, due to its simple structure, allows for lateral triggering for safety, while limiting the increase in its weight due to the presence of a triggering device.

Claims

1. Demands Heel piece (1) for ski touring, comprising: - a base (2) for fixing to a ski, said base (2) comprising a fixing support (21), said fixing support comprising a vertical cylindrical stud (215), - a fixing body (3) comprising a fixing element (4) configured to attach to a shoe, said fixing body (3) comprising a cylindrical housing (31) so as to insert said fixing body (3) onto the cylindrical vertical stud (215) of the vertical support (21), said fixing body (3) being fixed to the fixing support (21) of the base (2) so as to be movable in rotation around the vertical cylindrical block (215) and fixed in translation along said vertical cylindrical block (215), characterized in that the vertical cylindrical block (215) comprises an internal vertical cylindrical housing (211) open on the upper part of said vertical cylindrical block (215), the heel piece (1) comprising a retaining piece (5) having a cylindrical body (51) disposed in the internal housing (211) of the cylindrical vertical stud (215) and an upper end (52) disposed within the fixing body (3), the heel piece (1) further comprising a cam system connecting the vertical cylindrical block (215) and the retaining piece (5) such that a rotation about the vertical axis (Z) of the retaining piece (5) relative to the vertical cylindrical block (215) results in a vertical translation of said retaining piece (5), the fastening body (3) comprising a housing for the upper end (52, 52') of the retaining piece (5) having a shape complementary to the upper end (52, 52') of the retaining piece (5) such that said retaining piece (5) is rotationally fixed to the fastening body (3) and at least partially free in translation relative to said fastening body (3) within the internal housing (211) of the vertical cylindrical block (215), the heel piece (1) further comprising an elastic means (6) for translational constraint configured to exert on the piece maintenance (5) a holding force directed towards the base (2).

2. Heel piece (1) according to claim 1, characterized in that the fastening element (4) comprises two parallel arms (41) extending longitudinally and of which a first end projects forward from the fastening body (3), each arm (41) comprising a second end connected to each other by a curved portion (43) disposed at the rear so that said fastening element (4) has a general "U" shape, said fastening element (4) being disposed parallel to the base (2) on an upper part of the fastening body (3).

3. Heel piece (1) according to claim 2, characterized in that the retaining piece (5) has a vertical internal housing (54) in which the elastic constraining means (6) is disposed, said internal housing (54) having an internal shoulder (531) on which rests a lower end of the elastic means (6), the retaining piece (5) having an adjustment screw (55) for the compression of the elastic means (6) whose head rests on an upper end of the elastic means (6) and whose threaded rod is connected to the vertical support (21) so as to constrain the elastic means (6) in compression and to exert on the retaining piece (5) a retaining force directed towards the base (2).

4. Heel piece (1) according to claim 2, characterized in that the upper end (52) of the retaining piece (5) has a head disposed between the arms (41) of the fixing element (4), said head having a lateral wall (521) inclined in contact with each of the arms (41) of the fixing element (4), said arms (41) exerting a transverse force in convergent compression on said inclined walls (521) so as to exert on the retaining piece (5) a retaining force oriented towards the base (2).

5. Heel piece (1) according to claim 1, characterized in that the fastening element (4) comprises two parallel arms (41') of which a first portion (411) is longitudinally projecting forward from the fastening body (3) and a second portion (412) is vertically projecting within the fastening body (3) so that said arms (41') have a general "L" shape and are mobile in rotation around the axis formed by their second portion (412).

6. Heel piece (1) according to the preceding claim, characterized in that the retaining piece (5) has a vertical internal housing (54) in which the elastic constraining means (6) is disposed, said internal housing (54) having an internal shoulder (531) on which rests a lower end of the elastic means (6), the retaining piece (5) having an adjustment screw (55) for the compression of the elastic means (6) whose head rests on an upper end of the elastic means (6) and whose threaded rod is connected to the vertical support (21) so as to constrain the elastic means (6) in compression and to exert on the retaining piece (5) a retaining force directed towards the base (2).

7. Heel piece (1) according to any one of claims 5 or 6, characterized in that the upper end (52') of the retaining piece (5) has a head partially covering the first portions (411) of the arms (41') of the fastening element (4), said head (52') having two recesses (522) whose opening is oriented towards the base (2) and inside of which pass respectively a first portion (411) of the arms (41') of the fastening element (4), said recesses (522) having a lateral wall (523) inclined outwards so that a separation of the first portions (411) of the arms (41') from each other causes a translation of the retaining piece (5) in a direction opposite to the base (2).

8. Heel piece (1) according to any one of the preceding claims, characterized in that the housing of the fixing body (3) of the upper end (52, 52') of the retaining piece (5) is open on its upper part.

9. Heel piece (1) according to any one of the preceding claims, characterized in that the upper end of the cylindrical vertical block (215) has at least one rounded lateral notch (212) and in that the retaining piece (5) has at least one lateral cam (53) complementary to the at least one rounded lateral notch (212) of the vertical support (21).

10. Heel piece (1) according to any one of the preceding claims, characterized in that the fixing support (21) includes a base (214) connected with the base (2) by a sliding link so as to have a longitudinally adjustable position relative to the base (2).

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