FR2847419A1

FR2847419A1 - Device for protecting the rotating cutting element of a rotating trimmer device used to cut down vegetation, includes circular ring pivotally attached to branches that fix protection ring to trimmer handle

Info

Publication number: FR2847419A1
Application number: FR0214835A
Authority: FR
Inventors: Guy Puech
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-27
Filing date: 2002-11-27
Publication date: 2004-05-28

Abstract

The protection device includes a support device (4) having two branches (5,6) on which a protection ring (11), formed by front and rear hoops (12,13), is pivotally joined via tabs (20). The two tabs on opposite sides of the ring are connected by a bar (18) passing under the strimmer (RTM) head. The branches are attached to the trimmer handle (1) by a clamp (3).

Description

i Dispositif de protection d'un organe de coupe rotatif à axe verticali Protective device for a rotary cutter with vertical axis

équipantequipping

un instrument portatif de fauchage des végétaux. a portable tool for mowing plants.

L'invention est du domaine des instruments de coupe spécialement adaptés pour l'horticulture, et plus particulièrement du domaine des instruments portatifs destinés à faucher des végétaux. Elle a pour objet un dispositif de protection équipant un tel instrument portatif pour former, lors du fauchage, un bouclier à l'encontre des projections et une butée vis-à-vis The invention is in the field of cutting instruments specially adapted for horticulture, and more particularly in the field of portable instruments intended for mowing plants. It relates to a protective device fitted to such a portable instrument to form, during mowing, a shield against projections and a stop vis-à-vis

d'obstacles rencontrés.obstacles encountered.

On rappelle que l'on connaît des instruments portatifs de fauchage des végétaux, qui sont principalement constitués d'un manche de préhension muni à son extrémité distale d'une tête équipée d'un organe de coupe rotatif à axe vertical, tels que fil, lame ou disque. De manière courante, de tels instruments sont équipés d'un dispositif de protection comprenant un bouclier protecteur à l'encontre des projections de débris lors du fauchage, tels que des végétaux ou des cailloux. En outre ces dispositifs comprennent aussi un organe de butée vis-à-vis d'obstacles rencontrés par It will be recalled that portable instruments for mowing plants are known, which mainly consist of a gripping handle provided at its distal end with a head equipped with a rotary cutting member with vertical axis, such as wire, blade or disc. Currently, such instruments are equipped with a protection device comprising a protective shield against projections of debris during mowing, such as plants or stones. In addition, these devices also include a stop member vis-à-vis obstacles encountered by

l'instrument lors de son utilisation, éléments de bordure ou troncs d'arbres. the instrument during its use, border elements or tree trunks.

Pour connaître un environnement technologique proche de celui de la présente invention, on pourra notamment se reporter aux documents US5010720 (LOUIS V. CORSI), US4890389 (GEORGE H. WHITKOP), US5584348 (ROBERT L. BUTLER) et US5048187 (PATRICK J. To know a technological environment close to that of the present invention, one can in particular refer to the documents US5010720 (LOUIS V. CORSI), US4890389 (GEORGE H. WHITKOP), US5584348 (ROBERT L. BUTLER) and US5048187 (PATRICK J.

RYAN).RYAN).

Un problème posé réside dans l'organisation générale du dispositif de protection qui doit, sans pour autant être de structure complexe, associer le bouclier et l'organe de butée, et être équipé de moyens de A problem posed lies in the general organization of the protection device which must, without being of complex structure, associate the shield and the stop member, and be equipped with means of

fixation sur le manche de l'instrument. fixation on the handle of the instrument.

Un autre problème posé réside dans l'adaptabilité d'un tel dispositif à des instruments présentant des agencements sensiblement différents, notamment en ce qui concerne l'inclinaison de la tête de coupe par Another problem posed resides in the adaptability of such a device to instruments having appreciably different arrangements, in particular as regards the inclination of the cutting head by

rapport à l'axe général d'extension du manche de l'instrument. relative to the general axis of extension of the handle of the instrument.

Un autre problème à résoudre réside dans le fait que le dispositif de protection ne doit pas faire obstacle à un accès aisé à la tête Another problem to be resolved lies in the fact that the protective device must not prevent easy access to the head.

de coupe, en vue de sa maintenance sur site. cutting, for maintenance on site.

Le but de la présente invention est d'obvier aux problèmes susvisés, en proposant un dispositif de protection d'un organe de coupe rotatif à axe vertical, dont la structure soit simple, qui autorise son installation sur un relativement quelconque instrument portatif du genre susvisé, et The object of the present invention is to obviate the abovementioned problems, by proposing a device for protecting a rotary cutting member with a vertical axis, the structure of which is simple, which allows it to be installed on any relatively portable instrument of the above-mentioned kind. , and

qui ne soit pas cause de gêne pour la maintenance sur site de la tête de coupe. which does not cause discomfort for on-site maintenance of the cutting head.

Le dispositif de la présente invention comprend principalement un bouclier protecteur à l'encontre des projections de débris lors du fauchage, et un organe de butée vis-à-vis d'obstacles rencontrés sur le trajet de l'instrument. Le bouclier et l'organe de butée sont montés à l'extrémité distale d'un manche de préhension de l'instrument, par des moyens de fixation The device of the present invention mainly comprises a protective shield against projections of debris during mowing, and a stop member vis-à-vis obstacles encountered in the path of the instrument. The shield and the stop member are mounted at the distal end of a handle for gripping the instrument, by fixing means.

intermédiaires.intermediate.

Selon la présente invention, un tel dispositif According to the present invention, such a device

comporte les caractéristiques suivantes prises seules ou en combinaison. has the following characteristics taken alone or in combination.

Selon une caractéristique générale du dispositif de l'invention, l'organe de butée est principalement constitué d'un cerceau diamétralement articulé en pivotement par l'intermédiaire de moyens d'articulation sur un organe support équipé des moyens de fixation au manche de l'instrument, sur lequel organe support le cerceau est immobilisable par des moyens de According to a general characteristic of the device of the invention, the stop member consists mainly of a hoop diametrically articulated in pivoting by means of articulation means on a support member equipped with means for fixing to the handle of the instrument, on which support member the hoop can be immobilized by means of

blocage facilement réversible.easily reversible blocking.

Selon une forme préférée de réalisation de la présente invention, le cerceau est avantageusement composé de deux arceaux élémentaires, l'un avant et l'autre arrière. Ces arceaux sont articulés à leurs extrémités autour d'un axe commun, en étant conjointement portés par l'organe support par l'intermédiaire des moyens d'articulation. Ces dispositions sont telles qu'un basculement de l'arceau avant permet à l'utilisateur de régler à sa According to a preferred embodiment of the present invention, the hoop is advantageously composed of two elementary arches, one front and the other rear. These arches are articulated at their ends around a common axis, being jointly carried by the support member by means of articulation means. These provisions are such that a tilting of the front hoop allows the user to adjust to his

convenance la distance de butée entre l'obstacle et l'axe de rotation de l'outil. suitability for the distance between the obstacle and the axis of rotation of the tool.

Selon une forme préférée de réalisation de l'organe support, celui-ci est organisé en chape à deux branches sur lesquelles est articulé le cerceau. Ces branches sont avantageusement formées à partir d'éléments filiformes, dont les extrémités proximales sont solidarisées l'une à l'autre par une platine de jonction, pour leur liaison aux moyens de fixation à According to a preferred embodiment of the support member, the latter is organized in a clevis with two branches on which the hoop is articulated. These branches are advantageously formed from filiform elements, the proximal ends of which are secured to one another by a junction plate, for their connection to the fixing means to

l'extrémité distale du manche de l'instrument. the distal end of the neck of the instrument.

Les arceaux sont par exemple articulés aux extrémités correspondantes des branches de l'organe support par l'intermédiaire de pattes de fixation respectivement ménagées à chacune de leurs extrémités et The arches are for example articulated at the corresponding ends of the branches of the support member by means of fixing lugs respectively formed at each of their ends and

placées en juxtaposition.placed in juxtaposition.

La platine de jonction est par exemple fixée aux moyens de fixation par brochage, au moyen d'une broche à double goupilles de longueurs respectives différentes. Ces dernières dispositions facilitent l'introduction de la broche à l'intérieur de trous correspondants ménagés à travers The junction plate is for example fixed to the fixing means by broaching, by means of a pin with double pins of different respective lengths. These latter arrangements facilitate the introduction of the spindle into the corresponding holes made through

la platine de jonction et les moyens de fixation. the connection plate and the fixing means.

Les trous de passage de la broche à travers la platine de jonction et les moyens de fixation sont préférentiellement orientés suivant un plan incliné par rapport au plan de la platine, pour tendre à amortir les The holes for the spindle to pass through the junction plate and the fixing means are preferably oriented in an inclined plane relative to the plane of the plate, in order to tend to absorb the

vibrations dues aux efforts de coupe. vibrations due to cutting forces.

Selon une forme préférée de réalisation du bouclier, celui-ci est supporté par l'organe support conjointement avec le cerceau par l'intermédiaire des moyens d'articulation qui leurs sont communs. On comprendra que le bouclier s'étend à partir des moyens d'articulation au- dessus du cerceau sensiblement en superposition à celui-ci. On relèvera aussi à ce propos que l'agencement de l'organe support en branches distantes permet de ménager entre elles un espace formant un dégagement pour le passage du bouclier. Le bouclier comporte en outre à son extrémité proximale un organe de soutien par l'extrémité distale du manche de l'instrument, sur lequel il repose à l'encontre de son basculement, en vue de sa mise en According to a preferred embodiment of the shield, it is supported by the support member jointly with the hoop by means of articulation means which are common to them. It will be understood that the shield extends from the articulation means above the hoop substantially in superposition with the latter. It will also be noted in this connection that the arrangement of the support member in distant branches makes it possible to provide between them a space forming a clearance for the passage of the shield. The shield further comprises at its proximal end a support member by the distal end of the handle of the instrument, on which it rests against its tilting, with a view to setting it in place.

position d'utilisation.position of use.

Le blocage latéral du bouclier sur l'organe support est avantageusement obtenu à partir d'un appui élastique que prennent naturellement ses parois contre l'organe support à l'encontre d'une déformation initialement provoquée par l'utilisateur lors de sa mise en place, le bouclier étant assemblé sur l'organe support par emboîtement sur des doigts participants des The lateral blocking of the shield on the support member is advantageously obtained from an elastic support which its walls naturally take up against the support member against a deformation initially caused by the user during its installation. , the shield being assembled on the support member by interlocking on participating fingers of

moyens d'articulation.means of articulation.

De préférence, le dispositif est équipé d'un patin d'appui de l'instrument au sol. Ce patin permet de ménager, à partir de sa position en hauteur, un écart déterminé entre le sol et le cerceau lors de l'utilisation de l'instrument. On relèvera que le patin est préférentiellement équipé de moyens de réglage de sa position en hauteur par rapport au cerceau, ces moyens étant indifféremment des moyens de réglage discret et/ou des Preferably, the device is equipped with a support pad for the instrument on the ground. This shoe allows to spare, from its height position, a determined gap between the ground and the hoop when using the instrument. It will be noted that the skid is preferably equipped with means for adjusting its position in height relative to the hoop, these means being either discrete adjustment means and / or

moyens de réglage continu.means of continuous adjustment.

Conjointement avec le cerceau et le cas échéant le bouclier, le patin est avantageusement supporté par l'organe support par Together with the hoop and if necessary the shield, the shoe is advantageously supported by the support member by

l'intermédiaire des moyens d'articulation. through the means of articulation.

Selon une forme préférée de réalisation du patin, celui-ci est conformé en étrier fixé à l'organe support par l'intermédiaire de ses pattes. L'extrémité de l'une au moins de ses pattes comporte de préférence un prolongement formant un organe d'appui en chevauchement du patin contre la branche correspondante de l'organe support, pour conforter son immobilisation en According to a preferred embodiment of the pad, the latter is shaped like a stirrup fixed to the support member by means of its legs. The end of at least one of its legs preferably comprises an extension forming a support member overlapping the shoe against the corresponding branch of the support member, to consolidate its immobilization in

pivotement autour de son axe d'articulation. pivot around its axis of articulation.

On relèvera un aspect avantageux de l'invention selon lequel le cerceau, et le cas échéant le bouclier et le patin, sont conjointement supportés par un même organe support, sur lequel ils sont articulés indépendamment les uns des autres autour d'un même axe de pivotement, en étant immobilisables par l'intermédiaire des moyens de blocage qui leurs sont An advantageous aspect of the invention will be noted according to which the hoop, and if necessary the shield and the shoe, are jointly supported by the same support member, on which they are articulated independently of each other about the same axis of pivoting, being immobilizable by means of the blocking means which are their

communs.common.

Il en découle que quelque soit l'angle formé entre l'axe général d'extension du manche de l'instrument et l'axe de rotation de l'outil, il est possible d'orienter aisément et indépendamment le cerceau, et le cas échéant le patin et le bouclier autour d'un axe commun orienté diamétralement au cerceau, en vue d'adapter. la position de ces derniers selon l'agencement d'un relativement quelconque instrument. Plus particulièrement il est possible d'orienter le cerceau suivant un plan global sensiblement orthogonal à l'axe de rotation vertical de l'outil, par pivotement autour d'un axe de pivotement diamétral qui est It follows that whatever the angle formed between the general axis of extension of the handle of the instrument and the axis of rotation of the tool, it is possible to easily and independently orient the hoop, and the case if necessary the shoe and the shield around a common axis oriented diametrically to the hoop, in order to adapt. the position of the latter according to the arrangement of a relatively arbitrary instrument. More particularly, it is possible to orient the hoop according to an overall plane substantially orthogonal to the vertical axis of rotation of the tool, by pivoting around a diametral pivot axis which is

sensiblement concourrant à ce dernier. substantially contributing to the latter.

Les moyens d'articulation et les moyens de blocage facilement réversible sont avantageusement confondus en étant du type par boulonnage. Plus particulièrement, le cerceau au moins, sinon aussi au moins le bouclier et au moins le patin, sont articulés en pivotement autour des vis des boulons diamétralement opposés qui participent des moyens de blocage. On comprendra que les doigts d'emboîtement du bouclier sur l'organe support sont The articulation means and the easily reversible blocking means are advantageously combined by being of the bolting type. More particularly, the hoop at least, if not also at least the shield and at least the shoe, are pivotally articulated around the screws of the diametrically opposite bolts which participate in the locking means. It will be understood that the fingers for fitting the shield onto the support member are

constitués par le bout distal des vis. formed by the distal end of the screws.

La présente invention sera mieux comprise et des The present invention will be better understood and

détails en relevant apparaîtront, à la description qui va en être faite d'une forme details of it will appear, in the description which will be made of it in a form

préférée de réalisation, en relation avec les figures de la planche annexée, dans laquelle: La fig.1 est une vue d'ensemble en perspective partiellement éclatée du dispositif de l'invention selon un exemple préféré de réalisation. La fig.2 est une vue de détail en coupe transversale du dispositif représenté sur la fig.1, illustrant les moyens d'articulation preferred embodiment, in relation to the figures of the appended plate, in which: FIG. 1 is an overall perspective view partially exploded of the device of the invention according to a preferred embodiment. Fig.2 is a detail view in cross section of the device shown in Fig.1, illustrating the hinge means

et de blocage du cerceau, du bouclier et du patin sur l'organe support. and blocking the hoop, the shield and the shoe on the support member.

Sur les figures, un manche 1 de préhension et de manoeuvre d'un instrument de coupe portatif est muni à son extrémité distale d'un In the figures, a handle 1 for gripping and maneuvering a portable cutting instrument is provided at its distal end with a

organe de coupe rotatif 2 à axe vertical AI. rotary cutting member 2 with vertical axis AI.

Des moyens de fixation, tel qu'un collier de serrage 3, permettent de fixer au manche 1 un organe support 4 participant du dispositif de l'invention. Cet organe support 4 est organisé en chape dont les branches 5 et 6 sont formées à partir d'éléments filiformes distants, disposés de manière à lui conférer une conformation générale en Y. Ces éléments filiformes sont reliés entre eux au moyen d'une platine de jonction 7, qui est assemblée au collier de serrage 3 par l'intermédiaire d'une broche 8 à double goupilles 9 et 9' de longueur différente, pour faciliter son introduction à l'intérieur de trous, tels que Fixing means, such as a clamp 3, allow to fix to the handle 1 a support member 4 participating in the device of the invention. This support member 4 is organized in a yoke, the branches 5 and 6 of which are formed from distant filiform elements, arranged so as to give it a general Y-shaped conformation. These filiform elements are connected together by means of a plate of junction 7, which is assembled to the clamp 3 by means of a pin 8 with double pins 9 and 9 'of different length, to facilitate its introduction inside holes, such as

, ménagés à travers la platine de jonction 7 et le collier de serrage 3. , arranged through the connection plate 7 and the clamp 3.

Un cerceau 11, destiné à former un organe de butée à l'encontre d'obstacles rencontrés par l'instrument lors du fauchage, est A hoop 11, intended to form a stop member against obstacles encountered by the instrument during mowing, is

composé de deux arceaux 12 et 13, l'un 12 avant et l'autre 13 arrière. composed of two arches 12 and 13, one 12 front and the other 13 rear.

Les arceaux 12 et 13 sont articulés en pivotement autour d'un axe diamétral A2 du cerceau 11, en étant conjointement supportés par l'organe support 4 par l'intermédiaire de pattes de fixation respectives, telles que 14 et 15 qu'ils comportent. Chacune des branches 5 et 6 de l'organe support 4 maintiennent en juxtaposition à leur extrémité une patte de fixation 14,15 respectivement des arceaux avant 12 et arrière 13. Chaque jeu de pattes de fixation juxtaposées 14,15 reçoit une vis, telle que 16, participante de boulons 17 The arches 12 and 13 are pivotally articulated about a diametrical axis A2 of the hoop 11, being jointly supported by the support member 4 by means of respective fixing lugs, such as 14 and 15 which they comprise. Each of the branches 5 and 6 of the support member 4 maintain in juxtaposition at their end a fixing lug 14,15 respectively of the front and rear arches 13. Each set of juxtaposed fixing lugs 14,15 receives a screw, such as 16, bolt participant 17

de blocage des arceaux 12 et 13 dans une position choisie par l'utilisateur. for locking the arches 12 and 13 in a position chosen by the user.

On relèvera que l'utilisateur choisit à sa convenance, par simple basculement de l'arceau avant 12, la distance de butée entre les obstacles et l'outil de coupe 2. On notera par ailleurs que l'utilisateur oriente aisément par pivotement le plan général du cerceau 11 perpendiculairement à l'axe de rotation Ai de l'outil 2, pour adapter le dispositif de la présente invention à l'instrument sur lequel il est monté, quel que soit l'agencement général de cet instrument, et notamment l'angle formé par l'axe de rotation Ai de l'organe de coupe 2 et l'axe général d'extension A3 du manche 1 It will be noted that the user chooses at his convenience, by simple tilting of the front hoop 12, the abutment distance between the obstacles and the cutting tool 2. It will also be noted that the user easily pivots the plane general of the hoop 11 perpendicular to the axis of rotation Ai of the tool 2, to adapt the device of the present invention to the instrument on which it is mounted, whatever the general arrangement of this instrument, and in particular the angle formed by the axis of rotation Ai of the cutting member 2 and the general axis of extension A3 of the handle 1

de l'instrument.of the instrument.

Un patin 18 de réglage de la hauteur de coupe, conformé en étrier, est fixé à ses pattes, telle que 19, sur l'organe support 4 par l'intermédiaire des boulons 17 correspondants. Une patte 19 du patin 18 est munie d'un prolongement 20 formant un organe d'appui du patin 18 en chevauchement contre la branche correspondante 6 de l'organe support 4. Le patin 18 est équipé de moyens de réglage discret de sa position en hauteur, pour régler l'écart entre le sol et le cerceau 11, ses pattes 19 étant pourvues à cet effet A shoe 18 for adjusting the cutting height, shaped like a stirrup, is fixed to its legs, such as 19, on the support member 4 by means of the corresponding bolts 17. A tab 19 of the shoe 18 is provided with an extension 20 forming a support member for the shoe 18 overlapping against the corresponding branch 6 of the support member 4. The shoe 18 is equipped with means for discreet adjustment of its position in height, to adjust the distance between the ground and the hoop 11, its legs 19 being provided for this purpose

d'une pluralité de trous, tels que 21, de passage des vis 16. a plurality of holes, such as 21, for the passage of the screws 16.

L'organisation générale de l'organe support 4 à partir d'éléments filiformes écartés 5,6 lui confère une conformation générale en Y qui permet un dégagement pour le passage et le basculement d'un bouclier protecteur 22. Ce bouclier 22 est élastiquement emboîté sur les vis 16 à l'encontre d'une déformation provoquée par l'utilisateur lors de sa mise en place sur l'organe The general organization of the support member 4 from spaced filiform elements 5,6 gives it a general Y-shaped configuration which allows clearance for the passage and tilting of a protective shield 22. This shield 22 is resiliently fitted on the screws 16 against a deformation caused by the user when it is placed on the member

support 4.support 4.

La position d'utilisation du bouclier 22 lui est conférée par basculement autour des vis 16, jusqu'à sa mise en butée à son extrémité correspondante contre l'extrémité distale du manche 1 par l'intermédiaire d'un organe de soutien 23 qu'il comporte. A l'inverse, un simple relevage du bouclier 22 par basculement autorise un accès à l'organe de coupe 2 en vue de sa maintenance par l'utilisateur, sans avoir à retourner l'instrument, ni à The position of use of the shield 22 is conferred on it by tilting around the screws 16, until it comes into abutment at its corresponding end against the distal end of the handle 1 by means of a support member 23 which it comprises. Conversely, a simple lifting of the shield 22 by tilting allows access to the cutting member 2 for maintenance by the user, without having to return the instrument, or to

retirer le dispositif de l'invention. withdraw the device of the invention.

On remarquera enfin que l'emboîtement élastique du bouclier 22 contre les boulons 17 est de préférence réalisé en appui contre les écrous, tels que 24, participant de ceux-ci, cette prise d'appui constituant des moyens d'interdiction de déblocage spontané des moyens de blocage sous l'effet Finally, it will be noted that the elastic interlocking of the shield 22 against the bolts 17 is preferably carried out in abutment against the nuts, such as 24, participating in these, this abutment constituting means for preventing spontaneous release of the means of blocking under the effect

des vibrations provoquées par les efforts de coupe. vibrations caused by cutting forces.

Claims

1.- Device for protecting a rotary cutting member (2) with a vertical axis AI equipping a portable instrument for mowing plants, this device mainly comprising a protective shield (22) and a stop member (11) opposite - obstacle screws, which are mounted on the distal end of a handle (1) for gripping the instrument, by means (3) of intermediate fixing, characterized: in that the stop member is mainly consisting of a diametrically articulated hoop (11) A2 in pivoting by means of articulation means (16) on a support member (4) equipped with fixing means (3) to the handle (1) of the instrument, on which support member (4) the hoop (11) can be immobilized by means of

easily reversible blocking (17).

2.- Device according to claim 1, characterized: in that the hoop (11) is composed of two elementary arches (12,13), one front and the other rear, these arches (12,13) being articulated at their ends around a common axis A2, being jointly carried by the support member (4) by means of the

articulation means (16).

3.- Device according to any one of claims 1 and 2, characterized:

in that the support member (4) is organized in a screed with two branches (5,6) on which the hoop (11) is articulated, these branches (5,6) being formed from filiform elements whose ends proximal are secured to each other by a connecting plate (7), for their connection to the fixing means (3) at the distal end

of the handle (1) of the instrument.

4.- Device according to claim 3, characterized: in that the arches (12,13) are articulated at the corresponding ends of the branches (5,6) of the support member (4) by means of fixing lugs ( 14,15) respectively arranged at

each of their ends and placed in juxtaposition.

5.- Device according to claim 3, characterized: in that the junction plate (7) is fixed to the fixing means (7) by a pin (8) with double pins (9,9 ') of different respective lengths, to facilitate the introduction of the spindle (8) inside corresponding holes (10) formed through the plate

junction (7) and the fixing means (3).

6.- Device according to claim 5, characterized: in that the holes (10) for the passage of the spindle (8) through the connection plate (7) and the fixing means (3) are

oriented along an inclined plane relative to the plane of the plate (7).

7.- Device according to any one of the preceding claims,

characterized: in that the shield (22) is supported by the support member (4) jointly with the hoop (11) by means of the articulation means (16) which are common to them, extending above the hoop (11) substantially superimposed thereon, the shield (22) further comprising at its proximal end a support member (23) by the distal end of the handle (1) of the instrument on which it rests

against tilting, in view of its positioning.

8.- Device according to claim 7, characterized: in that the shield (22) is laterally blocked from an elastic support that naturally take its walls against the support member (4) against deformation initially caused by the user during its installation, the shield (22) being assembled on the support member (4) by interlocking on the participating fingers of the means

articulation (16).

9.- Device according to any one of the preceding claims,

characterized: in that it is equipped with a pad (18) for supporting the instrument on the ground, to provide a determined gap between the ground and the hoop (11) when the instrument is used. 10.- Device according to claim 9, characterized: in that the shoe (18) is equipped with adjustment means (16,21) of its height position relative to the hoop (11), these adjustment means (16, 21) being indifferently adjustment means

discreet and continuous adjustment means.

1i1.- Device according to claim 9, characterized: in that the shoe (18) is supported by the member

support (4) by means of articulation means (16).

12.- Device according to claims 3 and 11, characterized:

in that the shoe (18) is shaped like a stirrup fixed to the support member (4) by means of its legs (19), the end of at least one of which has an extension (20) forming a support member overlapping the shoe (18) against the corresponding branch (6) of

the support member (4), to reinforce its immobilization in pivoting.

13.- Device according to any one of the preceding claims,

characterized: in that the articulation means (16) and the easily reversible blocking means (17) coincide being of the bolting type, around the screws (16) of which bolts (17) are pivotally articulated at least the hoop (11), if not also at least the shield

(22) and at least the shoe (18).

he

14.- Device according to any one of the preceding claims,

characterized: in that the fixing means (3) are

organized in clamps.