EP1092924A1 - Pyrophoric lighter - Google Patents

Abstract

Cigarette lighter is fitted with blocking mechanism which stops rotation of knurled flint wheel (2) co-operating with knurled wheel drive (3). Blocking mechanism includes cover (14), for knurled wheel, having on its front part a plate (142) mounted so that it slides against inside of cap (5). Plate has on its rear part an edge (143) which can make contact with teeth of at least one of knurled wheel drives (3). The lighter has a body containing a liquefied gas reservoir, a lever (9) forming on its rear part a pusher (10), on which the user finger presses. The lever acts on a gas valve connected to a burner (8), a knurled wheel, and a flint (7). The knurled wheel is surrounded by drives (3) which together form the gas firing mechanism (23).

Description

The present invention relates to a gas lighter with rock and wheel ignition, fitted with a safety intended, in particular but not exclusively, to prevent people from using such a lighter normally unable to appreciate the potential danger of a flame, such as children.

A conventional disposable lighter includes a body containing a tank of pressurized liquefied gas, a lever control acting on a gas passage valve and of which a flat end constitutes the pusher on which will come press a user's finger, a scroll wheel, a stone lighter in contact with the thumbwheel and a regulator transforming liquefied gas into gas which can escape through the burner. The wheel is usually surrounded by hand and other by coaches, toothed, grooved or grooved to avoid slippage, larger in diameter than that of the wheel which reduce the effort required for rotation of the latter and avoid direct hand contact with the wheel always loaded with dust.

The ignition of the lighter requires two conditions, namely the simultaneous presence, in the same area, above the burner, sparks and expanded gas. Many "child-resistant" safety measures have already been proposed and, for some, applied, which aim to inhibit, release some gas.

Most of the devices offered use blocking removable from the pusher which prevents it from going down, so release the gas until a prior operation has failed been performed. It is often the release of a notch of safety. Before this operation, the pusher cannot open the valve and the gas does not come out, the formation sparks not constituting a significant danger.

A second type of security aims to prevent rotation of the wheel as long as a previous operation has not been performed, the movement of the pusher remaining free. he can either a movement of the coaches and the wheel in the forward direction, either by a vertical support on the assembly coaches-wheel which allows a clutch thereof.

It has already been proposed to block, in the extinction position, the rotation of the wheel by providing two positions of these, a rest position and a work position or ignition. We can cite for example EP-A-672 867 and FR-A-2736 420, documents in which the common axis of rotation wheel and its trainers is mobile under the action pressure in a straight groove forming a cam so that, if the wheel is not pressed, the wheel attacks the stone in a position which is not tangent which implies a blocking of the wheel by the stone.

In WO96 / 41103 and W095 / 04247 a guard is provided elastically deformable, covering part of the wheel, surrounded by coaches. This deformable element is linked to the body of the lighter. Sufficient pressure (which cannot generally not apply children) should be exercised on the guard to deform it before it can rotate the dial and produce sparks. A finger or a brake is provided to prevent the dial from turning when the pusher is depressed which would allow ignition in using two hands.

In FR-A-2731775, the coaches are shaped so that the wheel can only be driven under the action of a inch of relatively large dimension which is not the case of thumbs of children who cannot rotate the wheel to produce sparks, the gas outlet remaining possible at any time.

None of these systems, however, responds perfectly to desiderata of authorized users who wish a use as simple as possible, without damaging the fingers. The object of the present invention is to overcome the disadvantages of known devices and to propose a solution to the child safety problem, by blocking the wheel.

According to the invention, the safety device for a lighter comprising a body containing a gas tank liquefied under pressure, a lever forming, in its part back a pusher on which the thumb can come to rest of a user, acting on a gas passage valve connected to a burner, a thumb wheel, a lighter stone contact with the wheel, the wheel being surrounded on the side and other by coaches, the assembly being mounted pivoting around an axis supported in a yoke projection on the upper part of the lighter body and partially surrounded by a cover, is characterized in that that the lighter has rotation blocking means of the wheel cooperating with at least one coach.

According to another characteristic of the invention, said blocking means are carried either by the cover of protection, either by the mounting clevis of the axis of the unit ignition constituted by the wheel and its coaches, either by the axis of the ignition unit, or by the push lever or by a wheel cover forming a keep.

According to yet another characteristic of the invention, the axis of the igniter assembly is movable between two positions, one in which the coaches and the wheel are blocked and the other in which the coaches and, consequently, the wheel, are free to turn, which allows the generation of sparks.

According to yet another characteristic of the invention, the blocking of the coaches is carried out using a wheel cover partially surrounding it.

The idea on which the invention is based consists in blocking the wheel to prevent sparks from forming pusher either pressed or not to ensure better resistance to illicit use.

• les figures 1,2,3 et 4 des vues d'un briquet selon le premier mode de réalisation.
• les figures 5,6 et 7 des vues d'un second mode de réalisation respectivement en coupe verticale de la partie supérieure d'un briquet en position d'extinction (fig.5), en position d'allumage (fig.6) et en vue par-dessus (fig.7), dans lequel le blocage de la molette est obtenu par une pièce en saillie intérieure du capot;
• les figures 8 à 10, dans les mêmes conditions, un autre mode de réalisation dans lequel les entraíneurs comprennent une couronne extérieure et une couronne dentée intérieure
• les figures 11,12 et 13 dans les mêmes conditions un autre mode de réalisation dans lequel les moyens de blocage sont solidaires du corps du briquet et plus précisément de la chape de montage de l'ensemble d'allumage;
• la figure 14, encore un mode de réalisation dans lequel le blocage de la molette s'effectue sur l'axe de celle-ci;
• la figure 15, une vue en coupe selon la ligne XV-XV de la figure 14;
• la figure 16, une vue en coupe verticale d'un autre mode de réalisation, dans lequel l'ensemble d'allumage n'est pas mobile par rapport au corps du briquet le briquet étant en position d'extinction;
• la figure 17, dans les mêmes conditions que sur la figure 16, le briquet en position d'allumage;
• la figure 18, une vue par-dessus d'un briquet selon l'invention dans le second mode de réalisation;
• la figure 19, une vue du cache molette dans le mode de réalisation des figures 1 à 4;
• les figures 20 et 21 un autre mode de réalisation dans lequel le cache molette est fixé à l'avant du levier de poussoir.
• La figure 22 une vue d'un cache molette.

Other characteristics and advantages of the invention will appear during the description which follows of particular embodiments, given solely by way of nonlimiting example, with reference to the drawings which represent:

• Figures 1,2,3 and 4 views of a lighter according to the first embodiment.
• FIGS. 5, 6 and 7 of the views of a second embodiment respectively in vertical section of the upper part of a lighter in the extinguished position (fig. 5), in the ignition position (fig. 6) and in top view (fig. 7), in which the locking of the thumbwheel is obtained by an inner projecting part of the cover;
• Figures 8 to 10, under the same conditions, another embodiment in which the coaches comprise an outer ring and an inner ring gear
• Figures 11,12 and 13 under the same conditions another embodiment in which the locking means are integral with the body of the lighter and more precisely with the mounting yoke of the ignition assembly;
• Figure 14, another embodiment in which the locking of the wheel is carried out on the axis thereof;
• Figure 15, a sectional view along line XV-XV of Figure 14;
• Figure 16, a vertical sectional view of another embodiment, wherein the ignition assembly is not movable relative to the body of the lighter the lighter being in the extinguished position;
• Figure 17, under the same conditions as in Figure 16, the lighter in the ignition position;
• FIG. 18, a view from above of a lighter according to the invention in the second embodiment;
• Figure 19, a view of the wheel cover in the embodiment of Figures 1 to 4;
• Figures 20 and 21 another embodiment in which the wheel cover is fixed to the front of the pusher lever.
• Figure 22 a view of a wheel cover.

Throughout the figures, the same references designate the same items. The lighter body 1 comprising a liquefied gas tank (not shown) is provided, at its upper part, as known per se, of a set ignition 23 rotatably mounted on the body 1 of the lighter, including a wheel 2 integral in rotation with coaches 3 (of which only one appears in the figure), the whole being journalled in the body of the lighter by means of an axis 4 resting in a yoke 4a. This set is partially covered by a cover 5 which extends from the front of the lighter, on the right of the figure, to the back of the wheel-coaches set that it only covers part. The periphery of the wheel 2 is always in contact with a cylindrical stone 7 which is pressed towards the top by a spring 71 in a cylindrical housing 6 formed in the body 1 of the lighter. The rotation of the wheel in the sinistrorsum direction causes the projection sparks above the burner 8.

The burner 8 can be raised upwards to open a exhaust valve (not shown) of the gas contained in the tank included in the body 1 of the figure under the action of a lever 9 whose rear end constitutes a pusher 10 on the surface of which can rest a finger, usually the thumb, of a user. Leverage 9 is pivotally mounted on the body 1 of the lighter by via semi-axes 11, in the extension one on the other, journalled in yoke 4a, on both sides of the stone 7. The semi-axes 11 are located below axis 4 of the dial 2. The push-button is recalled at permanently upwards (position it occupies in the figure 1) by a spring 12 whose lower end rests on the bottom of a lighter cavity. Around the burner, can be arranged a spring (not shown) allowing, as known per se, to delay the release of gas when the lever 9 begins its upward movement. Others valve configurations can, of course, be used without departing from the scope of the invention.

Figures 1 to 3 show a first embodiment using a wheel cover during the different operating steps. The shape of the wheel cover is in this type of embodiment shown in figure 19.

Figure 19 shows the rigid wheel cover in perspective. It includes in its front part a surface flat or in cup 142 pierced with a hole 149 for passage of the gas, extending towards the rear by a rim 143, in protrusion from the surface 142. From the part back of the surface 142 extends the wheel cover proper 14 which extends downwards by a tab 141 which can be secured to the pusher by a lug 144. The wheel cover 14 is extended forward by the plate 142 which bears against the lower surface of the cover 5 on which it can slide between two positions corresponding to the switch-off and switch-on positions of the lighter, the front edge 147 of the plate 142 still remaining below the lower surface of the cover 5. The second branch 141 of the wheel cover is included in a slot transverse of the lever 9, in which its end lower is fixed.

The axis 4 of the igniter assembly 23 is slidably mounted in two oblong lights 200 provided in the yoke 4a in protrusion above the body 1 of the lighter, at the part superior of it. At rest, the spring 71 arranged below of stone 7 and which normally aims pressing the stone on the wheel moves the axis 4 thereof against the top 202 of the oblong light 200. This is the position which is shown in Figure 1 in which the lighter is in the extinct or quiescent state. Like this appears in the telescope of Figure 1, the edge 143 of the plate 142 is applied between two teeth 30 of the coaches 3 which avoids any rotation of the wheel and, consequently, the production of sparks. And if we press the button, the wheel remains blocked.

In Figure 2, the lighter is in the "ready" position to ignition which will be obtained by rotation of the assembly igniter 23 and immediate press on pusher 10. This position is obtained by pressing down on the figure on the igniter assembly 23 which bears against the edge 203 lights 200 of which only one appears on the figures. The cover 14 remains in its initial position. It results that the teeth 30 of the coach 3 escape the edge front 143 of plate 142 and that thumb wheel 2 can be driven in rotation.

In Figure 3, after descent of axis 4 of the assembly igniter 23, pusher 10 has been pressed and the flame can be generated; this is the ignition position. But as soon as the pusher 10 is pressed, the cover 14 is driven towards the rear of the lighter and the rear edge 143 of the plate 142 clings again between two teeth 30 of at least one coach so the dial can't be tour. Releasing the pusher causes movement of the cover 14 towards the front of the lighter and the release of the snap edge 143-teeth 30. But, under the influence of spring 71, axis 4 goes up in the rectilinear groove 200 so that the edge 143 is again between two teeth 30 as shown in Figure 1.

That is, it is no longer possible to rotate the wheel as soon as button 10 is pressed. The only case in which it is possible to carry out an ignition is that of Figure 2 which requires prior support on the igniter assembly 23, then pressing the pusher 10 immediately after turning the dial.

By deformation of the user's thumb, the user, like shown in Figure 4, can act on coaches 3 even when the wheel cover 14 is slightly above these if, of course, the thumb is that of an adult who is sufficiently wide, this mode of use being thus practically prohibited for children. That's what is shown in Figure 4 which is a cross section along line IV-IV of Figure 3, on which we see thumb P crashes on the wheel cover 14 which allows contact with coaches 3.

The embodiment which has just been described makes use of a wheel cover 14. Such a part is not necessary in the embodiment shown in Figures 5 to 7. As before, axis 4 of the wheel is mounted sliding in two grooves 200, one on each side of the yoke, between a high position 202 and a low position 203. At rest, in the inactive or extinct position, the spring 71 of the stone pushes, through this one, the axis 4 against the upper end 202 of the groove 200. In the example shown, groove 200 is preferably slightly inclined from the vertical. The rotation of the wheel must be prohibited in this position. This is achieved by providing the cover 5 of at least one locking tab 51, projecting towards the inside of the lighter, which, as it appears in the telescope on an enlarged scale, enters between two teeth 30 at least one coach 3. In FIGS. 5 and 6, the tab 51 is shown at the end. To unlock this snap, just press the coaches to slide axis 4 down and it reaches the lower position 203 shown in FIG. 6. As it appears in the attached bezel, this movement releases the trainer (s) from lug (s) 51 and allows the generation of sparks.

In Figure 7 which is a view from above of a lighter according to the invention, there is shown a cover 5 provided with two legs 51 symmetrical with respect to the axis of the lighter. But a single leg may be sufficient. As soon as support ends on set 23, axis 4 is brought up towards the top of the groove 200 under the action of spring 71. That is to say that pressing button 10 must be carried out between rotation of the wheel 2 by the coaches 3 and the reminder towards the top of axis 4.

The same idea of blocking coaches is implemented in the embodiment shown in Figures 8 to 10. In these figures which are vertical sections of a lighter according to the invention, there is one (or two) leg blocking 51 secured to the cover 5. On the other hand, the structure of coaches has been changed. They consist of a double notched crown, respectively outer fitted with notches or teeth 30, identical to the previous one and with inner crown 31 provided with teeth or notches 32, diameter smaller than that of crown 30. The operation of this embodiment is the same as previously i.e. when axis 4 is applied, by the spring 71, against the bottom 203 of the groove 200, the (or the legs) 51 comes into contact with the bottom or the wall inner teeth 32 which prevents rotation of the coaches 3. By cons, sufficient pressure exerted on the coaches lowers the ignition assembly 23 and releases the teeth 32 from the tab 51 which authorizes the rotation of the wheel. The coaches and the wheel can then generate sparks as it appears on Figure 9 and in the attached scope.

Figure 10 is a section along line X-X of Figure 8 on which the notch 51 and the teeth appear better inner 32 of the crown 31 which cooperates with the notch 51 when axis 4 is in the high position which corresponds to the Figure 8 rest position.

Figures 11 and 12 are vertical sections through the plane of symmetry of the lighter and Figure 13 a vertical section along line XIII-XIII of Figure 11. They represent another embodiment with double coaches crown 30,31 and an axis 4 of the ignition assembly 23 mounted sliding in a rectilinear groove 200 which is preferably inclined to the vertical. As previously, the wheel lock is obtained by range of a leg or the like against the teeth of the crown internal 31. But the tab or notch 52 is molded in the body of the lighter, inside the fork 4a and projecting towards the inside of the lighter. As before, we can provide one or two legs. It is the relative movement of the ignition assembly 23 relative to the remaining leg fixed which produces or not the blocking of at least one coach by tab 52. In FIG. 11, tab 52 blocks the teeth of the crown 31 whereas, when the assembly 23 has lowered as shown in figure 12, there is more contact and the assembly 23 can rotate.

As appears better in Figure 13, the cover 5 is itself permanently snapped, although it is removable, using lugs 53.

FIG. 14 shows another method of blocking the wheel using a yoke 4a having a groove rectilinear 200. In the figure, only a rectilinear groove 200 has been shown so as not to unnecessarily overload the drawing. This groove, formed in the yoke 4a remains, although heard fixed with respect to the body 1 of the lighter when the ignition assembly 23 slides down. This groove has a notch 201 at its upper part. axis 41 is no longer circular, as before but has, on at least one of its sides, a cavity 42 of which the shape corresponds to that of notch 201. The notch 201 is provided in the upper part 202 of the rectilinear groove 200. In the example shown, axis 41 has a cross section so that there are four cavities 42. In rest position, the stone spring pushes towards the top the ignition assembly 23 which as shown in Figure 18 prevents the rotation of the wheel 2, the rotation of the assembly 23 being blocked by bearing of the notch 201 in one of the cavities 42.

If the ignition assembly 23 is pressed, this support causes the compression of the spring 71 of the stone 7 and the lowering of axis 41 below notch 201 so that the axis 41 can rotate and drive the wheel.

To prevent a child from pressing hard enough to bring the axis in the lower region 203, it is possible to provide, in the cover, as shown in Figure 15 above the legs 53, punctures 54 oriented towards inside the lighter. In this case, so that the descent necessary happen, spread the wings 55 punctured which requires an additional effort independent of that resulting from the compression of the spring 71 of the stone, the axis can return to the high position under the single spring release action 71.

In all the embodiments which have just been described, in the rest or off position, the rotation of the thumbwheel is blocked, the unlocking being obtained by a support on the ignition assembly 23 which requires pressure determined, which only adults can exercise, followed by the rotation of the thumb wheel and pressing the push-button 10. In these embodiments, the unlocking comes from a level variation of axis 4 of the thumbwheel relative to body of the lighter. The movements of the pusher and the gas exhaust remain free.

To ensure the safety of children, it may be simply necessary to prevent the wheel from rotating after pressing the pusher 10 which releases the gas. The mode embodiment of FIGS. 16 to 18 makes it possible to obtain this result and no longer requires an ignition assembly movable but again to a wheel cover 14.

In Figure 16, we see that the wheel cover 14 is extends forward by a flat or shaped plate 142 such as that shown in the Figure 19, pressing against the lower surface of the cover 5 on which it can slide between two positions corresponding to the switch-off and switch-on positions of the lighter, the front edge 147 of the plate 142 still remaining below the lower surface of the cover 5. The second branch 141 of the wheel cover is included in a slot transverse of the lever 9, in which its end lower is fixed. A projection 143 is provided in the rear part of the plate 142. In the off position or of rest, the projection 143 is outside the periphery of the teeth 30 of the coaches 3. The coaches and consequently the wheel 2 which is integral with these in rotation can turn. Note that, in this position, the zone 30a teeth 30 is accessible.

As shown in Figure 17, if when after where not turns the wheel 2, press the button 10, the lever 9 pivots about the axis 11. Going down, the pusher 10 drives branch 141 downwards, but this movement produces a translation of the wheel cover 14 and plate 142 to the left of the figure so that the teeth in area 30a are now inaccessible by because of a difference in curvature between the coaches and the wheel cover and the difference in center of rotation. The wheel can no longer be driven by the coaches. During this movement, the plate 142 is also dragged to the left of the figure so that its rear edge 143 penetrates between two teeth 30 of at least one of the coaches 3 and blocks any rotational movement of these.

Figure 18 is a top view of a lighter in the embodiment of FIGS. 16 and 17. It can be seen that the wheel cover 14 surrounds wheel 2 and that plate 142 has a shape similar to that of the body of the lighter, the rear edge 143 of the plate penetrating between two teeth 30 coaches 3.

In the embodiment shown in Figures 16 to 18, the wheel cover is fixed by one of its ends of the rear side of the pusher and is extended forward by a flat surface that can slide against the underside of the hood. Pressing the pusher thus causes displacement towards the rear of the wheel cover which rises at the coaches. This displacement also causes dog clutching from the rear edge 143 of the face 142 with at least one of the coaches which blocks the wheel when the pusher is pressed. In the extinction or rest position, the projection 143 is outside the periphery of the teeth 30 of coaches 3. The coaches and consequently the wheel 2 which is integral with these in rotation can rotate. We note that, in this position, the area 30a of the teeth 30 is accessible.

In accordance with another embodiment of the invention, shown in Figures 20 and 21, the wheel cover 14 whose periphery extends over approximately 270 ° is fixed by one of its ends around the wheel 2 on the front lever 9 so that when the lighter is in position rest or extinction, the teeth 30a of the trainers are accessible and that, when support is exerted on the push button, they are no longer accessible, the wheel cover 14 coming at the same level (or higher) than their peripheries in the rear region of the coaches. This difference in relative position of the wheel cover 14 and of coaches 3 comes from the fact that when pressing on the button, the pivot centers of the button lever and of the wheel cover are not the same.

As shown in Figure 21, if when after or not turn the dial 2, press the button 10, the lever 9 pivots about the axis 11. Going down, the pusher 10 drives branch 141 downwards, but this movement produces a translation of the wheel cover 14 towards the left of the figure so the teeth of area 30a become inaccessible due to a difference in curvature between the coaches and the wheel cover and the difference in centers of rotation. The wheel cannot therefore no longer be coached by coaches.

Figure 22 shows in perspective a wheel cover ring 14 according to the invention. As it appears on the figure, the front part 15 of the wheel cover 14 extends over a width substantially equal to the overall width of the two coaches and has a slot 17 allowing the passage of sparks. This front part continues with a narrower portion 18 whose width is substantially equal to that of the dial and ends with one end 16. The edge of part 15 can be fixed by any means in the front part of the lever 9 and, for example, by snap-fitting or overmolding in bosses 19.

The movement of the pusher, around its axis 11 is reflected, relative to the wheel and the coaches by a movement combined rotation, elevation and translation the teeth 30a projecting from the cover 14. This is what combined movement which lifts the cover 14 above the wheel and brings it to or above the teeth 30 of coaches 3 which prohibits pressure on coaches and as a result the wheel drive and the production of sparks, except in adults, as mentioned next to Figure 4.

Although, in the embodiment which has just been described, the rigid wheel cover is fixed by its end front, it can be fixed by its two front ends and rear respectively on the front and rear of the lever relative to the wheel, the wheel cover moving like the push lever.

It goes without saying that many variations can be provided, in particular by substitution of technical means equivalent, without departing from the scope of the invention.

Claims (10)

Gas lighter fitted with a safety device, comprising a body (1) containing a gas tank liquefied under pressure, a lever (9) forming, in its part rear a pusher (10) which can be supported by a user finger acting on a flow valve gas connected to a burner (8), a thumb wheel (2), a stone lighter (7) in contact with the wheel (2) under the action a spring (71) arranged below the stone (7), the wheel being surrounded on both sides by coaches (3) and forming therewith a set igniter (23), the assembly being pivotally mounted around a axis (4) supported in a yoke (4a) projecting from the upper part of the lighter body (1) and partially surrounded by a cover (5), further comprising means for locking of the rotation of the thumbwheel (2) cooperating with minus a coach (3), characterized in that the means of locking include a wheel cover (14) having at its front part a plate (142) slidably mounted against the lower surface of the cover (5), the plate (142) having at its rear part a rim (143) which can enter contact with the teeth (30) of at least one of the coaches. Safety device according to claim 1, characterized in that the axis (4) is slidably mounted in rectilinear grooves (200) of the yoke (4a) between a upper locking position (202) and a free lower position (203). Safety device according to claim 2, characterized in that the flange (143) is in contact with the teeth (30) of a driver (3) when the axis (4) is in high position. Safety device according to claim 1 or 2, characterized in that, the protective wheel cover (14) is rigid and fixed by its rear part (141) to the lever (9) between the thumbwheel (2) and the pusher (10). Safety device according to claim 1 or 4, characterized in that, the protective wheel cover (14) is rigid and fixed by its rear part (141) to the lever (9) between the wheel (2) and burner (8). Safety device according to claim 1, characterized in that the blocking means consists of at least one lug (51) carried by the cover (5). Safety device according to claim 1, characterized in that the blocking means consists of at least one lug (52) carried by the body (1) of the lighter. Safety device according to claim 6 or 7, characterized in that the tab (51) comes into contact when the ignition assembly (23) is in the high position between teeth (30) of at least one driver (3). Safety device according to claim 5, characterized in that the wheel cover (14) comprises a front part (15) whose width is substantially equal to that of the coaches, pierced with an orifice (17) for passage sparks, extended by a part (18), the width is substantially equal to that of the wheel (2), the general shape of the ring being circular and extending over a sector at most equal to 270 °. Gas lighter comprising a body (1) containing a pressurized liquefied gas tank, lever (9) forming, at its rear part a pusher (10) on which can come and press a user's finger, acting on a gas passage valve connected to a burner (8), a wheel (2), a lighter stone (7) in contact with the thumbwheel (2) under the action of a spring (71) arranged below stone (7), the wheel being surrounded on the side and other by coaches (3), the assembly being mounted pivoting around an axis (4) supported in a yoke (4a) projecting from the upper part of the body (1) of lighter and partially surrounded by a cover (5), characterized in that it comprises a wheel cover (14) partially surrounding the wheel (7) and fixed by its rear end between the thumbwheel (7) and the pusher (10), its front end consisting of a free plate (142) which can slide on the internal surface of the cover (5), the rear edge of the plate 142 coming into contact with locking, when the wheel axis is in the high position with teeth (30) of a trainer (3) and being released by support on the ignition assembly (23) causing the sliding of the axis (4) downwards.

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