WO2003047405A1

WO2003047405A1 - Improved toaster

Info

Publication number: WO2003047405A1
Application number: PCT/FR2002/004110
Authority: WO
Inventors: Alain Rousseau; Michel Klinger
Original assignee: Seb S.A.
Priority date: 2001-12-05
Filing date: 2002-11-29
Publication date: 2003-06-12
Also published as: FR2832914A1; AU2002364801A1; CN1599573A; EP1450658A1; FR2832914B1

Abstract

The invention concerns an electric toaster, comprising a cooking chamber provided with an inserting slot, a bread-holder carriage mobile inside the cooking chamber, locking means for maintaining the carriage in a low position corresponding to a cooking position, return means for moving the carriage to a high position for removing the toast, when the locking means are inactive, a mechanism regulating the rising speed of the carriage when the latter moves under the effect of the return means, said mechanism including a rotary decelerating component (25) designed to be driven in rotation by the displacement of the carriage relative to the cooking chamber. The invention is characterized in that the rotary component (25) comprises at least a projecting and/or indented peripheral portion forming an air brake, about the rotation shaft (36) of said rotary component (25), so that when it rotates, the frictions in the air of said peripheral portion(s) (39) dissipate part of the kinetic energy of the carriage.

Description

IMPROVED ELECTRIC TOASTER

Technical area

The invention relates to the field of household appliances, and more precisely to cooking appliances of the electric toaster type. It relates more particularly to an improvement made to electric toasters with regard to the mechanism for slowing down the ascent of the bread carrier trolley.

Previous techniques

In general, an electric toaster has a baking chamber inside which is placed a bread trolley on which the slices of toast are placed. This bread-carrying trolley can be moved to a position corresponding to the baking in which it is then held by appropriate locking means. When the cooking is finished, the blocking means are deactivated, and return means, typically a spring, cause the movement of the carriage towards a position allowing the extraction of the toast.

To avoid too rapid reassembling of the toaster carriage, which could cause the toasted slices to be ejected from the toaster, it has already been proposed to equip toasters with retarding mechanisms, making it possible to slow the carriage when it moves under the effect of the recall means.

Thus, in document FR 2 035 965, a deceleration mechanism including a flywheel has been described, driven in rotation during the movement of the carriage. Such a mechanism has the major drawback of occupying a large volume inside the toaster, which increases the size of the appliance. Other solutions have also been proposed, by combining spring and damping systems, or sets of cylinder / piston type with air leakage. Such systems remain ineffective over the entire travel of the carriage, and are also unreliable over time, and of a complex construction.

The Applicant has also described in document EP 0 901 767 a retarder mechanism including a mechanical component operating by energy dissipation by viscous friction. Such a device is generally satisfactory, but it nevertheless remains sensitive to temperature variations which modify the mechanical properties of viscous friction, and therefore the characteristics of the deceleration.

The objective of the invention is to propose a mechanism for slowing down the ascent of the bread carrier trolley which is mechanically simple, and relatively insensitive to the temperature differences generated during the operation of the toaster.

DESCRIPTION OF THE INVENTION The invention therefore relates to an electric toaster, of the known type comprising:

. a baking chamber provided with at least one bread introduction slot, • a bread trolley capable of moving inside the baking chamber,

. blocking means capable of holding the carriage in a low position corresponding to cooking,. return means capable of causing the movement of the carriage towards a high position allowing the extraction of the toast, when the blocking means are inactive,

. a mechanism for regulating the rate of ascent of the bread-carrying trolley when the latter moves under the effect of the return means, said mechanism comprising a rotary part for deceleration capable of being rotated by the movement of the carriage relative to the cooking chamber.

According to the invention, the toaster is characterized in that the rotary part comprises at least one projecting peripheral portion and / or notched forming an air brake, around the axis of rotation of said rotary part.

This air brake portion is designed such that during the rotation of said part, the friction in the air of said peripheral portion (s) dissipates part of the kinetic energy of the carriage.

In other words, the ascent of the carriage causes the rotation of a part which has one or more projecting portion (s) and / or notched peripheral (s) or wings which stir (s) the air in which it (s) bathes, thus dissipating, by the friction of the displaced air, part of the mechanical energy transmitted to the carriage by the return means, thus avoiding too sudden and accelerated ascent of the carriage and therefore bread toasted.

Thus, the more the carriage tends to pick up speed, under the effect of the return means, the greater the friction in the air, thus allowing the said carriage to rise substantially at constant speed from the low wire position, to a high bread unloading position.

In a preferred version of the invention, the part comprises two projecting and / or indented peripheral portions forming an air brake, said portions being distributed angularly around the axis of rotation of the rotary part. The symmetry thus formed allows better stability of the rotating part.

Advantageously in practice, the speed regulation mechanism may comprise a set of geared pinions, one of which cooperates with a rack fixed relative to the cooking chamber, and one of which is secured to the rotary part, so as to cause the rotary part to move during the movement of the carriage, at a speed other than that of said carriage.

In other words, the set of pinions or gears which is mounted in the cruise control mechanism moves with the carriage. By cooperating with a rack fixed relative to the rest of the toaster, this set of pinions is set in motion, and thus causes the characteristic part comprising the peripheral portion (s), source ( s) energy dissipation.

By choosing the teeth ratios of the different pinions meshed one inside the other, we succeed in imposing on the airbrake part a very high speed of rotation, greater than a few tens of revolutions per second, which increases friction with air, and therefore the dissipation of energy, and consequently ensures the speed regulation effect.

Advantageously, the speed regulating mechanism is supported on the rack by means of a spring or a part having a spring effect, thus ensuring good transmission of the movement.

Another drive mechanism than that of a rack can be envisaged, in particular the use of cables or ropes, one end of which is connected to the chassis of the toaster, and the other end of which is for example wound on a shaft. secured to one of the gables.

In another embodiment of the invention, the set of pinions or gears is dissociated from the carriage by being integral with the frame or the housing of the toaster. Transmission is then ensured by a belt, a chain or their equivalent, part of which is integral with the carriage, while another comprises notches or teeth meshing with the pinion / gears assembly. Advantageously in practice, the speed regulation mechanism may include means disengaging the rotation of the air brake rotary part when the carriage moves in the direction of the position corresponding to cooking.

In other words, the regulation mechanism may only be active in the bread exit phase, whereas it has no effect when the bread is introduced into the toaster and the carriage is lowered. Indeed, this downward movement of the carriage is generally caused by a movement of the user, and in certain cases, it may be advantageous to overcome the resistance to the downward movement which can be caused by the operation of the regulation mechanism of speed.

In practice, the means for disengaging the rotation of the airbrake can be formed by a ratchet system associated with one of the pinions. The orientation of the pawl makes it possible to select the direction of movement during which the regulating device is active.

Other declutching systems can be used, for example by means of a "idler" pinion meshing with a motor pinion. When the direction of rotation of the latter tends to accentuate the effect of gravity on the "idle" pinion, said pinion then meshes with a pinion connected to the characteristic rotating part. On the other hand, when the motor pinion rotates in the other direction, it tends to cause the "idle" pinion to rise, which then no longer drives the pinion connected to the characteristic rotating part.

The axes of the pinions can also be mounted on a part articulated along an axis substantially parallel to the axes of the pinions, said part being oriented obliquely with respect to the direction of ascent of the carriage. In this way, the set of pinions comes, by gravity and or with the help of a spring, to engage on the rack, favoring the meshing during the ascent of the carriage and disengaging from the rack on the descent. The desired declutching effect can also be obtained by making mobile, in an oblong hole, elongated vertically, the pinion of the pinion meshing on the rack, said hole being produced in the parts for holding the axes of the pinions.

According to another characteristic of the invention, at least one peripheral portion of the rotating part is connected to the axis of said part by one or more deformable portion (s), so that said peripheral portion is offset under the effect of centrifugal forces following rotation. In other words, the fact that the rotary part forming the airbrake rotates at a high speed can cause the deformation of this part which then changes its geometry. This change may cause changes in the characteristics of friction in air. It can also lead to an increase in the moment of inertia, these two phenomena helping to improve the performance of the speed regulation mechanism.

Advantageously in practice, the mechanism then includes a friction zone on which the peripheral portion connected to the axis of the rotary part forming the airbrake is rubbed by one or more deformable portion (s), when under the effect centrifugal forces, said peripheral portion shifts from its original position.

In addition to friction in the air, solid friction is added, hence greater energy dissipation, and better regulation of the speed of movement of the bread carrier.

Advantageously, all the projecting and / or indented peripheral portions are connected to the axis of the rotary part by one or more deformable portion (s).

The rack can be associated with a carriage guide column. Advantageously in practice, the rack constitutes in itself a means for guiding the movement of the carriage. In other words, the rack serves as a rail guide for vertical movement of the bread carriage.

In practice, the return means can be formed by at least one spring, one end of which is secured to the carriage, and the other end of which is secured to the cooking chamber. However, other return means can be envisaged so as to operate with the characteristic retarding mechanism.

Brief description of the figures The manner of carrying out the invention as well as the advantages which result therefrom will emerge clearly from the description of the embodiment which follows, in support of the appended figures in which:

Figure 1 is a general summary perspective view of a toaster. Figure 2 is a perspective view of the toaster of Figure 1 in which the housing has been removed.

FIG. 3 is a top view of the retarder mechanism used in the toaster of FIG. 2.

Figures 4 and 5 are summary perspective views, shown from two different viewing angles of a part of the retarder mechanism. Figures 6, 7 and 8 show two possible configurations of an improvement of the present invention.

Figures 9 and 10 show alternative arrangements of the regulator system in a toaster.

Figures 11 and 12 show alternative embodiments of the rotary part of the retarder mechanism according to the invention.

FIG. 13 shows the various constituent elements of the rotary part of the retarder mechanism presented in FIGS. 11 and 12 during their assembly.

Way of realizing the invention

As already mentioned, the invention relates to an improvement made to the mechanism for raising the bread rack carriage in a toaster such as that shown diagrammatically in FIG. 1, and allowing a regulation of the ascent rate of said carriage, in order to avoid a too rapid and therefore too sudden ascent of the carriage.

More specifically, such a toaster 1 comprises an external frame 2, the upper face 3 of which is equipped with at least one insertion slot 4 for the bread to be toasted. This insertion slot 4 gives access to the baking chamber 5 illustrated diagrammatically in FIG. 2. This baking chamber 5 comprises a bread-carrying trolley 6 intended to support the slices of bread put to toast, said trolley being movable vertically against the return force of a spring 11, as is well known in the art.

The downward movement of the carriage 6 can be obtained by action on a lever 7, accessible on a side face of the toaster. This lever can for example be embedded in a housing 8 pierced with a vertical slot 9 to allow the displacement of the connection portion 10 of the lever 7 with the rest of the carriage 6.

In known manner, the toaster comprises locking means (not shown) which keep the carriage 6 in the low position during the cooking operations. Such elements may consist of an electromagnet and its control circuit. Additional means, not shown, associated with a thermostat or a timer, make it possible to deactivate the blocking means when the cooking has come to an end, to allow the carriage 6 to rise.

In this case, the spring 11, operating in traction, exerts on the carriage 6 an upwardly directed force. This spring 11 is fixed by one end 12 to the frame, and for example to the cooking chamber 5, the other end of the spring being integral with the carriage 6.

According to the invention, the upward movement of the carriage is controlled by the presence of the speed control device 13. This regulation mechanism 13 is illustrated in FIG. 3 in top view.

This mechanism is integral with the carriage 6 via a connecting portion 14. This retarder mechanism therefore moves substantially vertically relative to a rack 20 which is fixed relative to the rest of the toaster.

Guide means 21, of sufficient height, are provided to guide the retarder mechanism 13, and therefore of the carriage 6 during its vertical movement.

The regulating mechanism can be arranged in such a way that, by simple gravity, it presses on the rack.

Advantageously, a spring 43, or a part having a spring effect, makes it possible to press the retarder mechanism on the rack, in order to ensure good transmission of the movement. This spring, or the part having this spring effect, can work, in combination or not, in compression, in tension and / or in torsion.

The retarder mechanism has two vertical side walls

22, 23 between which are arranged different pinions ensuring the movement of the moving part 25 forming an airbrake. More specifically, a first pinion 26 is meshed on the notched part 27 of the rack 20. This pinion 26 pivots about an axis of rotation 28 mounted between the two walls 22, 23. During its movement, the first pinion 26 drives a second pinion of larger diameter 29 situated on the same axis 28. This pinion 29 is meshed with a third pinion 30 of smaller diameter, itself driven in rotation about an axis 31 connecting the two walls 22, 23. By means of a shaft 33, the third pinion 30 is connected to a fourth pinion 34, of larger diameter, mounted on the same axis 31. This fourth pinion 34 is meshed with a fifth pinion 35 located below the fourth pinion 34, and which has a smaller diameter. This fifth pinion 35 is mounted on an axis 36 connecting the two walls 22, 23. This axis 36 extends outside the wall 23 to form the axis of rotation of the characteristic rotating part 25.

More specifically, this air brake 25 comprises a central portion 38, and two peripheral projecting portions 39 connected to the central part 38 by connecting portions 40. These peripheral projecting portions 39 have in a plane passing through the axis of rotation of the part. 25, a relatively large area, so as to cause friction in the air, when the part 25 is rotated. The connecting portions 40 are of relatively small dimensions, so as to be deformable under the action centrifugal forces exerted radially on the peripheral portions 39 during the rotation of the part 25.

Given the position of the connecting portions 40 relative to the peripheral projecting portions 39, and more specifically, the fact that the connecting portions 40 are offset relative to the center of gravity of the portions 39, it follows that under the effect of the centrifugal force, said portions 39 move to approach the friction zone 42 forming a bell mounted on the wall 23. Thus, when the speed of rotation of the parts 25 reaches a sufficient speed, and typically of the order at 60 rpm, the peripheral projecting portions 39 rub against the internal face of the bell 42, thus dissipating part of the kinetic energy of the carriage.

In operation, the user has one or more slices of bread through the slot 4 of the toaster, bearing on the bread-carrying trolley 6. He then lowers the bread-carrying trolley by means of the control lever 7.

According to one of the simplified modes of the present invention, the speed regulating mechanism 13 acts as well on the descent of the carriage as on its ascent. Advantageously, a specific device makes it possible to interrupt the regulation mechanism during the descent phase of the carriage, as will be developed later. The bread holder trolley is held in the low position by any known system, such as an electromagnet. At the end of a cooking cycle, the electromagnet releases the bread-carrying carriage which is returned to its upper position by the return spring 11. Therefore, the pinion 26 meshes with the rack 20, which has the effect of rotating the various pinions 29, 30, 34, 35 resulting in the rotation of the airbrake part 25.

The bread-carrying trolley is then subjected to different forces: - a restoring force by the spring 11 which tends to accelerate the movement of the trolley, - a braking force by the various frictions in the air, even on the friction zone 42 peripheral projecting portions 39.

By extension, the term “air brake” will be used subsequently to also designate combined braking by stirring the air and physical friction of the peripheral projecting parts 39 on a friction zone 42.

The more the carriage tends to gain speed, the greater the frictional forces. The regulation mechanism is therefore dimensioned, in particular in the ratio of the pinions, but also in the geometry and the materials chosen in terms of dry friction, so that the carriage quickly acquires a substantially uniform ascent speed.

Once the retarder mechanism in action, we can however tolerate significant variations in the ascent rate, which can be up to 15%, because the objective of the device is only to slow the ascent of the carriage, and a variation, even significant of the speed of ascent of the carriage has little impact on said ascent itself.

The ratio of the teeth between the successive pinions 26, 29, 30, 34, 35 is such that the speed of rotation of the part 25 forming the airbrake is of the order of 4000 revolutions / min. It follows that the phenomena of friction in the air are significant, and that the deformation of the rotary part 25 occurs quickly to increase the deceleration by dry friction with the bell 42.

In the illustrated form, the part 25 forming the airbrake comprises only two peripheral projecting portions 39, but it goes without saying that the number and the shape of each of these parts can be adapted to the desired rate of deceleration. A single peripheral projecting portion can in particular be used.

Thus, and by way of example, the deformation of the characteristic part 25 could occur, not in the direction of the axis of rotation 36, but also radially, or in a combined manner.

Thus, by using a regulating mechanism as illustrated in the figures, comprising a chain of five pinions, with an overall gear ratio of the order of 17.5, it is possible to regulate the rate of ascent of the carriage to a value of 70 mm / s, when the weight of the carriage 6 is of the order of 60 g, without bread placed on the carriage, with a return spring of a stiffness of the order of 8 N in the low position at 4 N in the high position, the stroke traveled being of the order of 90 mm. The speed, controlled, avoids throwing the bread out of the room.

By the presence of the braking device, the stiffness of the spring can also be increased to ensure that a large force, when the carriage is in the low wire position, limits the risks of jamming by bread crumbs of said carriage when this the latter is released and tends to return the carriage to a high bread unloading position. However, since the electrical supply contacts are often carried by the carriage, possible jamming in the low position may lead to the interruption of the electrical supply at the end of the baking cycle, which may lead to excessive toasting of the bread and damage to the device with risk of fire. Alternatively, the rack does not cover the entire length corresponding to the lift stroke of the carriage. Its lower end is then at a distance from the pinion 26 when the carriage is held by the electromagnet in the low position. Thus, the ascent of the carriage, over the first few millimeters, is not slowed down by the regulation system 13. The pulling force on the bread-carrying carriage is therefore maximum, and can also make it possible to compensate for a jamming of said carriage by crumbs or a specific over-grill.

Figure 6 shows a possible embodiment of a mechanism for disengaging the braking system when lowering the carriage. Thus, the walls, of which only the wall 220 is shown, on which the various axes of the toothed wheels 26, 29, 50, 52 of the retarder system are arranged are articulated around an axis 56. This axis is judiciously disposed relative to the center of gravity of the system so that the latter is in abutment on the rack 20. Advantageously, a spring 43 makes it possible to compensate for the positioning deviations between the parts linked to the tolerances, by ensuring constant support of the pinion 26 on the rack 20. This spring can be molded on the regulator housing or on the toaster housing.

In operation, the ascent is carried out as previously stated. The arrangement of the axis of rotation 56 of the walls 220, as well as the pressing force generated by the spring 43 tends, during the upward movement of the carriage, to rotate the supports anti-clockwise, allowing to mesh the pinion 26 on the rack 20, ultimately leading to the rotation of the toothed wheel 52 whose axis carries the rotary part forming the airbrake, not shown, as previously explained.

On the other hand, when the carriage is lowered, the retarder system tends to escape by pivoting around the axis 56 clockwise. As a result, the teeth of the pinions 26 do not mesh on the rack 20, the rotary part forming the airbrake is therefore not rotated, thus deactivating the retarder system. Depending on the articulation point of the system and the spring force, a disengaging function can be created in the event that the user forces the system to rise, thus avoiding premature degradation of the mechanism.

Figures 7 and 8 offer another alternative for disengaging the retarder system when lowering the carriage.

The principle of this declutching is to provide a vertical stroke of the axis

28 of the pinion 26 in an oblong hole 60, elongated vertically, the displacement of the pinion 26 in this hole allowing or not disengaging the gear of the following pinions. This oblong hole 60 is produced in the parts 22, 23 for holding the pinion axes.

Thus, during the ascent of the carriage, the result of the interaction between the teeth 27 of the rack 20 and those of the pinion 26, taking into account the movement from bottom to top of the carriage causes the displacement of the axis 28 towards the part bottom of the hole 60. This position corresponds to that where the pinion 62 meshes with the pinion 29 arranged on the axis 28.

When the carriage descends, the axis 28 moves towards the upper part of the oblong hole 60, which has the consequence of moving the pinions upwards.

26 and 29 relative to the pinion 62. The latter is then disengaged from the pinion 29, which prevents the rotation of the part forming the air brake of the retarder system.

It can be provided, when the carriage is lowered, when the electrical contacts are closed, a short vertical ascent stroke of the carriage to a holding bolt in the lower position of said carriage, making it possible to move the axis 28 in the hole to re-engage the pinion 62 on the pinion 29, avoiding a start when the carriage is raised, once the cooking cycle has ended. The declutching device can still find other technical embodiments. For example, two consecutive cogwheels can be configured like a ratchet system so that the rotation of the drive wheel causes the rotation of the other wheel only when it rotates in a direction of rotation, which is that corresponding to the reassembly of the bread carrier.

Another embodiment of the invention is illustrated in FIGS. 9 and 10. It consists in dissociating the device for regulating the bread carrier trolley.

Thus, in FIG. 9, the vertical walls of the retarder system between which are arranged different pinions, including the first pinion 26 which triggers the rotation of the various gears and of the rotary part forming the airbrake, are physically linked, for example by the part 135 to the lower part of the inner frame 16 of the toaster.

A belt 133 is connected, at one of its ends, by known means 134, such as gluing or riveting, to the vertical support 15 of the bread-carrying carriage mounted to slide on a vertical column 17.

The other end of the belt is integral with a vertical part of the internal frame 16.

Furthermore, the belt, on an extended central part, is crenellated or toothed, so as to be able to cooperate with the pinion 26.

Thus, when the carriage rises from the toasting position to a bread unloading position, under the action of the spring 11, it drives in its ascent the belt 133 which in turn drives the pinion 26 in rotation, triggering the retarder system .

A variant of this principle, illustrated in FIG. 10, consists in proposing an endless belt 136, such as a timing belt, arranged between the pinion 26 and a pulley 140. This belt, linked by a means 134 to the bread carrier trolley by the plate 15 also transmits the movement of raising the trolley to the pinion 26.

Figures 11 to 13 show alternative embodiments of the rotary part forming the airbrake and its relation to the other constituent parts of the regulation system. In these variants, braking in the air has been increased by the use of specific additional blades. Thus, the rotary part 250 has a core 252 and three radial arms 254 curved at their end by forming an arc of a circle relative to the core 252. This part is made of a flexible and deformable material. In particular, the arms 254 can deform and unfold under the effect of centrifugal force when the part is rotated.

The part 250 is provided with a central opening and is positioned, by the said opening, on an axis 256. Two symmetrical lateral arms 258 are arranged on this axis and comprise, at their end, blades 260.

The relation of the part 250 forming the air brake with the other parts of the speed regulation system is ensured by an endless screw 264 which can be rotated by a pinion.

As a variant, presented in FIG. 12, a toothed wheel 270 can also be used for the transmission of the movement of the pinions, as previously explained.

A bell 266 is intended to cover the rotating part 250, between the blades 260.

Thus, when the part 250 is rotated by means of the screw 264 or the pinion 270, the arms 254 unfold, under the action of centrifugal force, and come to stir the air and rub against the internal wall of the bell 266. At the same time, the blades 260, also in rotation, participate in the regulation movement, by aerodynamic braking.

A more economical version of the previous embodiment presented in FIG. 12 consists in making the part 250 forming the airbrake, the blades 260 and the pinion 270 in a single piece, for example made of thermoplastic, therefore having a lower coefficient of friction at the level of the blades only if these had been made of elastomer. The thickness of these blades could, for example, be increased to compensate for this difference.

Protection of the speed regulation system can be envisaged by a housing containing, not only the pinions and / or gears, but also the part forming the airbrake, thus making it possible to ensure sealing against the crumbs and dust of the device. The opening for the passage of the column and / or the rack can be furnished with brushes or flaps to maintain a good seal at this location.

It appears from the above that the slowing down mechanism according to the invention has multiple advantages, and in particular that of ensuring braking of the ascent of the carriage which is not a function of the inevitable temperature variations taking into account the proximity from the cooking chamber. In addition, the ascent rate thus regulated is relatively constant over a large stroke, and for a greater range of forces.

By the relative discretion of the operation of the retarder system, it can advantageously be provided to supplement the device with a signal or a noise during the ascent phase of the carriage, making it possible to warn the consumer that the bread is toasted. This warning can in particular be obtained through the teeth of the pinions, by a judicious choice of the material composing them in order to make their gear audible. Any other known means of sound signaling can be used in the context of the present invention. In particular, arrangements in the cogs causing a whistling sound during their rotation can be used.

Claims

B.0539 "RK3J CLAIMS

1. Electric toaster (1), comprising:

. a baking chamber (5) provided with at least one bread insertion slot (4),. a bread carriage (6) able to move inside the cooking chamber (5),. blocking means capable of holding the carriage in a low position corresponding to cooking,. return means (11) capable of causing the movement of the carriage (6) towards a high position allowing the extraction of the toast, when the blocking means are inactive,. a mechanism for regulating the rate of ascent of the bread carrier carriage when the latter moves under the effect of the return means, said mechanism comprising a rotary part (25, 250) for slowing down capable of being rotated by displacement of the carriage relative to the cooking chamber (5), characterized in that the rotary part (25, 250) comprises at least one projecting and / or indented peripheral portion (39, 254, 260) forming an air brake, around the axis of rotation (36, 252) of said rotary part (25, 250), so that during the rotation of said part, the friction in the air of said peripheral portion (s) (39) , 254, 260) dissipates part of the kinetic energy of the carriage (6).

2. Toaster according to claim 1, characterized in that the rotary part (25) comprises two peripheral portions (39) projecting and / or indented distributed angularly around the axis of rotation (36) of the rotary part (25 ).

3. Toaster according to one of claims 1 or 2, characterized in that the mechanism comprises a set of geared pinions (26, 29, 30, 34, 35, 50, 52, 264, 270), one of which cooperates with a rack (20) fixed relative to the cooking chamber (5), and another of which (35, 52, 264, 270) is secured to the rotating part (25, 250), so as to cause the rotary part (25, 250) to move when the carriage (6) is moving, at a speed other than that of said carriage.

4. Toaster according to the preceding claim, characterized in that the mechanism is supported on the rack (20) by means of a spring (43), or of a part having a spring effect.

5. Toaster according to claim 1, characterized in that it comprises means disengaging the rotation of the air brake rotary part when the carriage (6) moves in the direction of the position corresponding to cooking.

6. Toaster according to claim 5, characterized in that the means disengaging the rotation are formed by a ratchet system associated with one of the pinions.

7. Toaster according to claim 5, characterized in that the axes of the pinions (26, 29, 50, 52) are mounted on a part (220) articulated along an axis (56) substantially parallel to the axes of the pinions (26 , 29, 50, 52), said part (220) being oriented obliquely relative to the direction of ascent of the carriage.

8. Toaster according to claim 5, characterized in that the axis (28) of the pinion (26) meshing on the rack (20) is movable in an oblong hole (60), elongated vertically, said hole ( 60) being produced in the parts (22, 23) for holding the pinion axes.

9. Toaster according to claim 1, characterized in that at least one peripheral portion (39, 254) of the rotary part (25, 250) is connected to the axis (36, 252) of said part (25, 250) by one or more portion (s) deformable (s) (40), so that said peripheral portion (39, 254) is offset under the effect of centrifugal forces following rotation.

10. Toaster according to the preceding claim, characterized in that the mechanism also includes a friction zone (42) on which the peripheral portion rubs, under the effect of centrifugal forces.

(39, 254) connected to the axis of rotation of the rotary part by one or more deformable portion (s).

11. Toaster according to claim 3, characterized in that the rack

(20) constitutes a means for guiding the movement of the carriage (6).

12. Toaster according to claim 1, characterized in that the return means are formed by at least one spring (11), one end of which is secured to the carriage, and the other end of which (12) is secured to the cooking chamber.