FR2821695A1 - Musical instrument stand, especially for saxophone or guitar, has base, lower holder and spring hook to apply upward tension - Google Patents

Abstract

The stand (1) consists of a base that rests on a flat and stable surface, and an upright (2) in adjustable telescopic sections (3, 4). It has two holders (18, 35), a lower one (18) for the bottom of the instrument and an upper one (35) in the form of a flexible spring-loaded hook that applies an upward force (F) to apply a tension between the two holders. The base has a pair of adjustable feet (8a, 8b) that can be moved between closed and deployed positions, and the lower holder ca be attached to one of the feet.

Description

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The present invention relates to a support for a musical instrument, in particular a support for saxophone or for guitar.

 A musical instrument is generally a fragile object.

It is therefore necessary for any musician to have near him a support placed stably on the stage, to store his instrument when he is not playing it.

 Document US Pat. No. 6,121,527 describes a support for a string instrument comprising a base capable of stably bearing on a flat surface, an elongated carrier element linked to said base and extending above said base, and a rigid fork-shaped retainer attached to the top of said carrier member. To store a string instrument on this support, engage its handle in the fork and rest the head of the instrument on the fork, the body of the instrument hanging freely below.

 This support does not offer sufficient security and stability of maintenance. Indeed, if the support is jostled or receives a shock, the instrument is allowed to oscillate freely, so that it can be damaged by banging against the carrier element and that it risks falling off.

 Also known are supports for alto or tenor saxophone, which include a tripod-shaped base, a rod which extends obliquely above the tripod, and two support brackets fixed on the rod, one at mid-height of the rod to install the cylinder head of the instrument, and the other at the top of the rod, to install the horn of the instrument.

 This support also does not offer sufficient security and stability of maintenance because the instrument is simply placed there. Thus, the instrument can easily fall if the support is jostled or receives a shock.

 Also known from FR 2 642 211 is a support for saxophone which comprises a tripod-shaped base, a bar which extends obliquely above the tripod, a fork fixed on the bar to place the horn of the instrument and a hook intended to be first fixed to the saxophone at a location on the body of the instrument intended for fixing the lyre, to then hang the saxophone at the top of the bar.

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 The disadvantage of this support is that it does not offer sufficient flexibility of use. Indeed, the location for fixing the lyre is not always the same according to the saxophone manufacturers, so that the support is only suitable for certain saxophones. The installation of the suspension hook integral with the saxophone prevents proper storage of the instrument in many cases, thus making it necessary to dismantle it, which is tedious handling.

 The invention aims to provide a support which offers better stability of the supported instrument by overcoming the aforementioned drawbacks.

 For this, the invention provides a support for a musical instrument, said support comprising a base capable of stably bearing on a flat surface, a carrier element of elongated shape linked to said base and extending above said base, and two retaining members, at least one of which is fixed to said support element, characterized in that at least one of said retaining members is elastically deformable between a rest position, taken in absence of a musical instrument to be supported, and a tension position, taken in the presence of a musical instrument retained on said support by said retaining members, the deformable retaining member in tension position exerting a force on said instrument of music so as to put it in tension between said retaining members.

 Each retaining member has a retaining zone intended to retain the musical instrument by a predefined contact zone of the latter. When the deformable retaining member is in the rest position, the distance between the two retaining members is greater than the distance between the two contact zones of the instrument to be supported. When the instrument is placed on the support, it therefore deforms the deformable retaining member towards the other retaining member, so that the deformable retaining member exerts on the instrument an elastic restoring force which forces the instrument against the other retainer. This restoring force makes the holding of the instrument on the support more stable, in particular in the event of an accidental collision of the support by an accessory player or a musician.

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 Advantageously, said base comprises at least two elongated feet integral with said carrier element and arranged on either side of it.

 Preferably in this case, each foot is articulated relative to said support element, so as to be able to pivot between a folded position, in which said foot is substantially parallel to said support element, and an unfolded position, in which said feet form a stable support. with said carrier element.

 Thus, the support according to the invention with its folded feet has a reduced bulk and can be stored in an elongated case of small section, which facilitates its transport.

 Advantageously in this case, said feet are pivotally mounted by means of a base body integral with said carrier element and which has two wings arranged so as to prevent the pivoting of said feet beyond their unfolded position.

 Advantageously, the other of said retaining members is rigid and fixed to one of said feet or to said carrying element.

 Preferably in the latter case, said carrier element has several predetermined locations for fixing said rigid retaining member there. With this characteristic, the support of the invention adapts to several sizes of instruments.

 According to a particular characteristic of the invention, said rigid retaining member is arranged so as to be able to be retracted substantially along the element on which it is mounted and to be able to be deployed substantially perpendicular to said element. In this way, the size of the support can be reduced to a minimum for its storage.

 Preferably in this case, said element on which said rigid retaining member is mounted comprises a stop pin for stopping said rigid retaining member at said deployed position.

 Advantageously, said rigid retaining member comprises at least one bent branch with a concavity turned substantially towards the bearing surface of said base.

 Advantageously, said rigid retaining member comprises a first fork.

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 Preferably, said deformable retaining member is fixed to said carrier element.

 Advantageously in this case, said deformable retaining member comprises a spring, one end of which is bent in the form of a hook to suspend said musical instrument, which is for example a saxophone.

 This hook allows you to hang a saxophone by its hanging ring. The suspension ring is traditionally intended to receive the hook of a cord passed around the neck of the player to support the weight of the instrument while it is being played. The rigid branch is intended to engage in the concavity of the cylinder head of the instrument to pull it down against the spring and prevent it from oscillating towards the carrier element if the support is jostled . The curvature of this branch provides a stable equilibrium position for the instrument. In this case, the support according to the invention is suitable for other wind instruments having a suspension ring and a cylinder head, ie bass clarinets, basset horns, tuba, etc.

 According to another characteristic of the invention, said deformable retaining member comprises a second fork intended to straddle said musical instrument, said musical instrument being for example a guitar.

 In all cases, said carrier element is preferably adjustable in length to vary a distance between said retaining members, so as to adapt the support to different instruments as a function of the distance between the respective contact areas thereof.

 According to yet another characteristic of the invention, the support comprises a removable additive support intended to support a second musical instrument, said additive support comprising a base plate capable of bearing stably on said flat surface and capable of being linked removably to said base, a column extending substantially perpendicularly from said base plate and a flexible sleeve slidably fitted on said column and retained in position by elastic clamping.

 A musician often having several instruments to play during a concert, this additive support allows you to store an instrument

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 additional, such as a flute, a soprano saxophone or a straight clarinet, by engaging the column in the horn of the instrument and resting the end of the horn on the base plate. The flexible sleeve can be compressed radially in the roof so as to stabilize the holding of the additional instrument. The connection between the base plate of the additive support and the base of the support reinforces the stability of the additive support.

 The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the following description of several particular embodiments of the invention, given solely by way of illustration and without limitation. , with reference to the accompanying drawing. In this drawing: - Figure 1 is a general perspective view of a first embodiment of the support according to the invention; - Figure 2 is an enlarged partial perspective view of detail II of Figure 1; - Figure 3 is a perspective view of a rigid retaining member of the support of Figure 1; - Figure 4 is a perspective view of a base of the support of Figure 1; - Figure 5 is a perspective view of an elastic retaining member of the support of Figure 1; - Figure 6 is a perspective view of a tip of the support of Figure 1; - Figure 7 is a perspective view of a plug of the support of Figure 1; - Figure 8 is a perspective view of the support of Figure 1 in the storage position; - Figure 9 is a sectional view of an upper support tube of the support of Figure 1; - Figure 10 is a perspective view of an additive support of the support of Figure 1; - Figure 11 is a perspective view of the support of Figure 1 carrying a saxophone;

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- Figure 12 is a perspective view of a second embodiment of the support according to the invention; - Figure 13 is a perspective view of a third embodiment of the support according to the invention; - Figure 14 is a plan view of a guitar intended to be supported by the support of Figure
13; - Figure 15 is an enlarged partial view in perspective and in axial section of an alternative embodiment of the carrier element.

 The first embodiment of the invention will now be described with reference to FIGS. 1 to 11.

 In FIG. 1, the saxophone support 1 comprises a telescopic metallic support element 2 formed by a lower support tube 3 and an upper support tube 4 engaged in the lower tube 3. The lower tube 3 is engaged through a bore 5 of a base 6, better visible in FIG. 4. An adjustment screw 7 is screwed into the base 6 so as to fix it on the lower tube 3, a base part 3a of the lower tube 3 projecting below the base 6 to form a support leg for the support.

 Two feet 8a and 8b are connected at one end to the base 6 on either side of the lower tube 3 and form with the base part 3a of the lower tube 3 a tripod. The feet 8a and 8b are also made of metal tube. The free ends of the legs 8a and 8b and of the lower tube 3 are closed off with plastic plugs 9a, 9b, 9c. The legs 8a and 8b can each pivot around an axis screwed into the base 6. As best seen in FIG. 8, two plastic spacer tubes 11a, 11b are engaged on the axes between the base 6 and the legs 8a , 8b respectively. Two heads 12a, 12b retain the feet 8a, 8b at the ends of their respective pivot axes.

 In FIG. 4, the base 6 comprises a body 13 in the form of a right prism of isosceles triangular section with a cut edge 14 at the intersection of the two equal faces 15a and 15b. For fixing the axes

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 feet, the body 13 has two axis holes 16a and 16b opening orthogonally on the faces 15a and 15b and in the bore 5, the latter being parallel to the generator of the prism. The base 6 comprises on the top of the body 13 two wings 17a, 17b extending perpendicular to the bore 5 on either side of the latter and parallel to the face of the body 13 opposite the edge 14. The wings 17a and 17b serve as a stop for the feet 8a and 8b in the unfolded position, as visible in FIG. 1. The unfolded legs 8a and 8b are arranged in a V on the support surface of the support, the carrier element 2 s' extends obliquely above the V, substantially perpendicular to its bisector.

 The support 1 also comprises a rigid retaining member 18 comprising a tubular branch 19 articulated at the level of a bevelled end portion 20 on the foot 8b, substantially at mid-length thereof. As can be seen in FIG. 2, the branch 19 is mounted in rotation about an axis 21 fixed in a spacer 22 welded slightly projecting from the foot 8b, so as to be able to pivot in a retracted position, substantially parallel to the foot 8b, and a deployed position, substantially perpendicular to the foot 8b. The beveled part 20 has at its free end a lug 23 in the extension of the branch 19. The lug 23 abuts against a stud 24 projecting perpendicularly on the spacer 22 to stop rotating the branch 19 deployed.

 The other end part of the branch 19 is bent with its concavity turned towards the support surface of the tripod and forms a retaining index 25 intended to rest in the internal radius 29 of the breech 28 of a saxophone 27, shown in FIG. 11. For example, the angle between the branch 19 and the retaining index 25 is substantially 1250.

 With reference to FIG. 3, the rigid retaining member 18 also includes a guide branch 30 fixed perpendicularly to the branch 19 and also bent with its concavity turned towards the support surface of the tripod. The branches 19 and 18 are assembled at their respective elbows, which form two comparable angles. The guide branch 30 is intended to bear laterally against the yoke 28 of the saxophone 27.

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 The free end of the upper tube 4 is closed by a plastic end piece 31, better visible in FIG. 6, the body 32 of which is engaged in the tube 4 and the head 33 of which is chamfered. The end piece 31 has an axial bore 34 in which is engaged an elastic retaining member 35, shown in the rest position in FIG. 1.

 Referring to Figure 5, the elastic retaining member 35 is an elastically deformable spring steel wire which has an end portion 36 substantially straight to engage the end piece 31, an intermediate portion 38 bent on an angle of substantially 135 and another substantially straight end portion 39 which ends in a hook 37.

 Referring to Figure 9, the upper support tube 4 is plugged at its lower end 40 engaged in the tube 3 by a guide plug 41 whose head 42 is adapted to the inner diameter of the tube 3 for slidingly guide the upper tube 4 in the lower tube 3. The upper tube 4 also has two parallel diametric holes 4a and 4b at two different levels.

 Referring to Figure 1, the lower tube 3 has a diametric bore 3b near its upper end and a pin 43 is diametrically engaged through the diametrical holes 3b and 4b aligned to lock the upper tube 4 in position. The supporting element 2 can be adjusted in length by removing the pin 43, by pulling the upper tube 4 out of the lower tube 3 until the second hole 4a is aligned with the hole 3b, and by reinserting the pin 43. This thus gives a carrier element 2 of greater length, corresponding to an increased distance between the hook 37 and the index finger 25.

 Figure 15 shows an alternative embodiment of the carrier element 2 adjustable in length. In this case, the diametric holes 3b, 4a and 4b are replaced by a single radial hole 69 in the upper tube 4 and two radial holes 73a and 73b spaced axially in the lower tube 3. In the lower part of the upper tube 4 is inserted a U-shaped spring 72, one branch 72a of which bears against the inner wall of the tube 4 opposite the radial hole 69 and the other branch 72b of which carries a locking lug 70 engaged at its end through the radial holes 69 and 73a aligned to lock the two tubes 3 and 4 in position. The lug 70 has a body 74 in the form of a bell

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 diameter less than or substantially equal to the diameter of the holes 69, 73a and 73b, and a washer 71 fixed coaxially to the base of the body 74. The diameter of the washer 71 is greater than the diameter of the holes 69, 73a and 73b. The locking lug 70 has a bore (not shown) in which is engaged an end portion 75 of the branch 72b bent at right angles to the branch 72b. The spring 72 keeps the body 74 projecting outside the carrier element 2, the washer 71 being in abutment on the inner face of the tube 4. To adjust the length of the carrier element 2, push on the lug 70 until it is brought substantially level with the lower tube 3, then the tube 4 is pulled axially. The body 74 retracts inside the tube 3 by sliding against the edge of the bore 73a, which allows the upper tube 4 to slide until the radial hole 69 is placed opposite the radial hole 73b. The lug then protrudes under the action of spring 72 to block the tubes in the new position. The lower tube 3 can have any number of radial holes to define as many adjustment positions.

 Referring to Figure 8, the support 1 is shown in the storage position. The pin 43 being withdrawn, or the lug 70 being respectively returned to the lower tube 3, the upper tube 4 is completely returned to the lower tube 3. The two feet 8a and 8b are folded down along the carrier tube 2. The branch 19 is retracted along the foot 8b which carries it and the guide branch 30 is inserted obliquely between the foot 8b and the lower tube 3, so that the support 1 is folded compactly and can be stored in an elongated case , for example a cylindrical case (not shown).

 With reference to FIG. 11, the operation of the first embodiment of the support 1 will be explained. To set up a saxophone 27 on the support 1, the suspension ring 44 welded to the body 45 of the saxophone is passed around the hook 37 to hang the instrument on the spring 35. The suspension ring 44 is always in the same location saxophone 27, substantially at the center of gravity of the instrument. The saxophone is then pulled down by elastically deforming the spring 35 and slightly inclined laterally until the concavity of the breech 28 is brought up to the retaining index 25, which is then engaged in the internal radius 29 of the breech 28 in

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 laterally straightening the instrument. The instrument is then in place and can be released. The spring 35 exerts on the body 45 a restoring force F which pulls the yoke 28 against the index finger 25. The instrument is tensioned between the index finger 25 and the spring 35, while the guide branch 30 rests laterally on the yoke 28 prevents the saxophone from pivoting. The base of the cylinder head 28 is for example 4 or 5 cm above the support surface of the support, the center of gravity of the assembly formed by the instrument and the support 1 is therefore low. The body of the instrument is slightly straightened compared to the position it would occupy by simply hanging from the hook 37, which reduces the size of the support on the ground.

 In total, the positioning movement and the reverse movement, withdrawal of the instrument, are easy and can be carried out quickly: there is no key capable of hindering the insertion of the index finger 25 into the inner radius 29 of the cylinder head and the spring 35 is flexible enough to be deformed without excessive effort. The adjustment of the length of the carrier element 2 makes it possible to adapt the support 1 to several instruments having different distances between the suspension ring and the internal radius of the cylinder head.

bouchon 9a ou 9b, visible à la figure 7, et en la vissant dans l'insert 50. En variante, le trou diamétral 52 pourrait aussi être ménagé dans le pied 8b. Referring to Figure 10, the first embodiment of the support 1 comprises an additive support 46 for storing a clarinet in B-flat, a soprano saxophone or a straight instrument of the same type. The additive support 46 comprises a base plate 47 in the form of a disc, a substantially cylindrical column 48 fixed substantially in the center of the base plate 47 and projecting from one side thereof. On the column 48 is slidably fitted a flexible sleeve 49 of synthetic foam which holds in position on the column 48 by elastic tightening. The lateral face 51 of the base plate 47 comprises a fixing insert 50 radially embedded and which has a threaded bore. Referring to Figure 1, the additive support 46 is removably assembled to the support 1 by engaging a fixing screw 68 through a diametrical hole 52 formed in the head of the

plug 9a or 9b, visible in FIG. 7, and by screwing it into the insert 50. As a variant, the diametrical hole 52 could also be made in the foot 8b.

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 A second embodiment of the support according to the invention will now be described with reference to FIG. 12. The elements identical or analogous to those of the first embodiment bear the same reference number as these increased by 100. The support element 102 is a round or square wooden rod or a tube. At one end of the carrying element 102 is fixed the elastic retaining member 135 identical to the spring 35, shown in the rest position in FIG. 12, and at the other end are fixed the two feet 108a and 108b, also made a round or square wooden rod or a tube. The feet 108a and 108b are pivotally mounted on a bent pin 110 which passes through the support element 102, so as to be able to pivot between a folded position substantially parallel to the support element 102, and an unfolded position, in which they abut against a stop plate 117 fixed on the front face 152 of the carrier element 102.

 The rigid retaining member 118 comprises a first branch 119 bent at a right angle. A first part 153 of the branch 119 is engaged in a bore 154 passing through the carrier element 102 perpendicularly to its lateral face 156. The second part 155 of the branch 119 is partially engaged laterally in a groove 157 on the face 156. A means clamping engaged on the first part 153 enables the branch 119 to be fixed on the support element 102. The second part 155 extends substantially perpendicularly to the axis of the support element 102 as far as the hook 137 and carries a curved lateral index 125 with its concavity turned towards the support surface of the support and welded perpendicularly to the branch 119. The index 125 and the second part 155 carry protective sleeves 158 to avoid scratching the instruments carried on the support saxophone 101.

 The operation of the support 101 is identical to that of the first embodiment, the instrument being tensioned between the elastic retaining member 135, the hook 137 of which is hooked to the suspension ring of the saxophone, and the member rigid retainer 118, the index 125 of which has passed through the inner radius of the cylinder head. The carrier element 102 has a second bore 154a and a second groove 157a in the face 156 for fixing the retaining member 118 at a higher level, in order to adapt the support to a shorter instrument. Each position of branch 119 corresponds to a size

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 instrument such that the distance between the branch and the hook 137 in the rest position is greater than the distance between the suspension ring and the inner radius of the cylinder head of the corresponding instrument. To fold the feet 108a and 108b, the retaining member 118 is first folded over the carrier element 102.

 A third embodiment of the support according to the invention will now be described with reference to FIG. 13. The elements identical or analogous to those of the first embodiment bear the same reference number as these increased by 200.

 The telescopic support element 202 with the pin 243, the base 206 carrying the feet 208a and 208b are identical to the corresponding elements of the first embodiment. The spindle 243 can also be replaced by the lug mechanism of FIG. 15. The elastic retaining member 235, shown in the rest position in FIG. 13, is a fork fixed by its spring steel rod at the end free of the upper tube 204. Its two branches 219a and 219b extend substantially horizontally perpendicular to the area of the support surface of the support 201 between the two feet 208a and 208b. The ends of the branches 219a and 219b are bent upwards.

 The rigid retaining member 218 is a fork fixed to the lower tube 203 by an arm 259 which extends substantially horizontally parallel to the branches 219a and 219b. The front end of the arm 259 carries a U-shaped arch 260, the two branches 260a and 260b of which are parallel to the branches 219a and 219b and are curved with a concavity facing the bearing surface of the support 201.

 The support 201 makes it possible to carry a guitar 66, the positioning of which is as follows: the handle 65 is engaged in the fork 235 obliquely so as not to strike the fork 218. The elasticity of the fork 235 makes it possible to engage the part high 62 of the body of the instrument under the arch 260. The guitar can be released. The fork 235 exerts on the head 64 an elastic restoring force which pulls the body 63 against the fork 218 in the concavity of the arch 260. The instrument is tensioned between the points of contact 61 and 62 with the organs of detention.

The curvature of the branches 219a, 219b, 260a and 260b guarantees a stable hold of the instrument, which can neither pivot, tilt, nor bump against the carrier element 202.

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Thanks to these characteristics, the support 201 makes it possible to suspend a string instrument by the head of the handle from the elastic fork 235, while the rigid fork 218 straddles the handle above the body of the instrument and forms a support for the body. . By pulling the instrument against the rigid fork 218, the elastic fork 235 stabilizes the maintenance of the instrument. In addition, it dampens the oscillations of the instrument and prevents it from banging in the carrier element if the support is jostled.

A length adjustment of the carrier element 202, represented by the arrow 67, makes it possible to adapt the support 201 to other string instruments, according to their length of handle.

Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these are within the scope of the invention.

In the three embodiments described, the base of the support is formed by the two feet and the lower end of the carrier element. But it can also be formed of a solid plate, which increases the weight and the stability of the support for carrying a heavy instrument.

Claims (16)

1. Support for musical instrument, said support (1, 101,201) comprising a base (8a, 8b, 3a) capable of stably resting on a flat surface, a carrier element (2) of elongated shape connected to said base and extending above said base, and two retaining members (18,35; 118,135; 218,235) at least one of which is fixed to said support element, characterized in that at least one (35,135, 235) of said retaining members is elastically deformable between a rest position, taken in the absence of a musical instrument to be supported, and a tension position, taken in the presence of a musical instrument (27,66) retained on said support by said retaining members, l 'deformable retaining member in the tension position exerting a force (F) on said musical instrument so as to put it in tension between said retaining members.  2. Support according to claim 1, characterized in that said base comprises at least two elongated feet (8a, 8b; 108a, 108b; 208a, 208b) integral with said carrier element and arranged on either side thereof .  3. Support according to claim 2, characterized in that each foot is articulated relative to said support element, so as to be able to pivot between a folded position, in which said foot is substantially parallel to said support element, and an unfolded position, in which said feet form a stable support with said carrier element.  4. Support according to claim 3, characterized in that said feet are pivotally mounted by means of a base body (6,206) integral with said carrier element and which has two wings (17a, 17b) arranged so as to preventing the pivoting of said feet beyond their unfolded position.  5. Support according to one of claims 2 to 4, characterized in that the other (18) of said retaining members is rigid and fixed to one (8b) of said feet (2,102, 202).  6. Support according to one of claims 1 to 4, characterized in that the other (118,218) of said retaining members is rigid and fixed to said carrier element (102,202). <Desc / Clms Page number 15>  7. Support according to claim 6, characterized in that said carrier element (102) has several predetermined locations (154,154a; 157,157a) for fixing said rigid retaining member (118).  8. Support according to one of claims 5 to 7, characterized in that said rigid retaining member (18, 118) is arranged so that it can be retracted substantially along the element (8b, 102) on which it is mounted and able to be deployed substantially perpendicular to said element (8b, 102).  9. Support according to claim 8, characterized in that said element (8b) on which is mounted said rigid retaining member (18) comprises a stop pin (24) for stopping said rigid retaining member in said deployed position .  10. Support according to one of claims 5 to 9, characterized in that said rigid retaining member (18,118) comprises at least one branch (19,25; 125) bent with a concavity turned substantially towards the bearing surface of said base.  11. Support according to one of claims 5 to 9, characterized in that said rigid retaining member (218) comprises a first fork (260).  12. Support according to one of claims 1 to 11, characterized in that said deformable retaining member (35,135, 235) is fixed to said carrier element (2,102, 202).  13. Support according to one of claims 1 to 12, characterized in that said deformable retaining member comprises a spring (35,135), one end of which is bent in the form of a hook (37,137) for suspending said musical instrument (27) .  14. Support according to one of claims 1 to 12, characterized in that said deformable retaining member (235) comprises a second fork (219a, 219b) intended to straddle said musical instrument (66).  15. Support according to one of claims 1 to 14, characterized in that said carrier element (2,202) is adjustable in length to vary a distance between said retaining members (18, 35; 218,235). <Desc / Clms Page number 16>  16. Support according to one of claims 1 to 15, characterized in that it comprises a removable additive support (46) intended to support a second musical instrument, said additive support comprising a base plate (47) capable of bear stably on said flat surface and capable of being removably linked to said base (8a, 8b), a column (48) extending substantially perpendicularly from said base plate and a flexible sleeve (49) fitted with sliding on said column and retained in position by elastic clamping.