APPARATUS FOR THE PREPARATION OF FOODS PROVIDED WITH A SECURITY DEVICE
FIELD OF THE INVENTION The present invention relates to the general technical domain of household electrical appliances for the preparation of foods that have a motor box on which a container that has an immobile support that supports a work tool and can be disposed can be arranged. particularly to an apparatus having a safety device that prevents the operation of the engine when the container cover is not correctly mounted on the motionless support. BACKGROUND OF THE INVENTION Patent application GB 2 1 34 804 discloses an apparatus for the preparation of food that has a motor box on which a container enclosing a working instrument carried by a stationary support and a device can be placed. of safety that prevents the operation of the engine when the mobile support is no longer covered by the container cover. For this the safety switch is operated by a bolt carried by the cover of the container in such a way that the apparatus can not operate in the absence of the latter. A solution in which the cover of the container must present an appendix to operate the switch, however presents the drawback that complicates the manufacture of this
cover, particularly when it is glass. Furthermore, such a solution has the drawback of not being completely safe, the switch remains accessible while the stationary support is placed on the drive box in such a way that the user in any way can try to operate the safety switch by means of a pointed object. Brief Description of the 8th Invention Thus, the object of the present invention is to provide a domestic appliance for the preparation of food, which has a container that has a cover mounted on the motionless support that has a working instrument, in which The safety device prevents operation of the apparatus when the cover is not mounted on the motionless support and in which the cover of the container does not have a particular appendix for operating the safety device in such a way that it presents a simple way of manufacturing and to clean. Another object of the present invention is to propose a safety device which offers a wide safety of use and which allows the obtaining of a particularly compact immobile support. For this purpose, the invention relates to a domestic appliance for the preparation of food that has a motor box provided with a pedestal receiving a work container, the work container has a cover and a motionless support that holds a rotary tool that must rotate by means of the drive box, characterized in that the support is provided
to be placed on the receiving pedestal according to one or more predetermined angular positions and in that the support has a safety member that can rotate between a rest position in which the cover is uncoupled from the motionless support, and an active position in which is found while the cover of the container is coupled to the stationary support, the safety member has at least one actuator element that cooperates with a safety switch carried by the drive box to authorize operation of the engine only when the support is placed on the motor housing with the safety member in active position, the actuator element is angularly displaced while the safety member is in the rest position in such a way that it no longer cooperates with the safety switch. According to another characteristic of the invention, the safety member remains in the rest position through retaining means. According to another feature of the invention, the safety switch is operated by a command in which the actuator element is supported, the command is arranged in an area that is blocked by the immobile support while the latter is placed on the receiving pedestal . According to another characteristic of the invention, the cover of the work container is coupled or uncoupled to the immobile support by means of a rotating movement, the safety member is
maintains by means of the cover towards the active position after the coupling of the cover on the stationary support. According to still another characteristic of the invention, the cover has a lower end provided with an opening delimited by an assembly sleeve having a thread, the cover is mounted on the movable support by means of screwing. According to still another characteristic of the invention, the support has blocking means preventing the rotation of the safety member from the rest position towards the active position in the case of absence of the cover on the immobile support, the locking means are unlocked after the coupling of the container cover on the stationary support. According to another characteristic of the invention, the coupling means are constituted by at least two locks that move radially from a locking position to an unlocking position after the coupling of the cover on the stationary support. According to another feature of the invention, the safety member has the shape of a safety crown that holds the rotary instrument. According to another characteristic of the invention, the actuator element is constituted by a cam carried by the lower face of the safety crown. According to another feature of the invention, the safety crown has a seal against which the
lower end of the container cover when the cover is mounted on the immobile support. According to another feature of the invention, the motionless support has an outer skirt having a complementary shape of the pedestal for receiving the drive box that allows the coupling of the skirt on the receiving pedestal according to one or more predetermined angular positions, the crown The safety device is mounted rotatably on the skirt. BRIEF DESCRIPTION OF THE FIGURES The objectives, aspects and advantages of the present invention will be better understood after the description given below of a particular embodiment of the invention presented by way of non-limiting example, and with reference to the attached drawings in which: Figure 1 is a perspective view of a food preparation apparatus according to a particular embodiment of the invention, the container is coupled to the motor box; Figure 2 is a perspective view of the immobile support shown above the drive box of the apparatus of Figure 1; Figures 2 and 4 are transverse perspective views of the stationary support of Figure 2, Figure 5 is a side view of the stationary support of Figure 2, Figure 6 is a sectional view according to line VI-VI of Figure 2, Figure 7 is a perspective view representing the box
motor coupled to the immobile support only, Figure 8 is a side view of the vessel equipped with the motionless support, Figure 9 is a sectional view according to line IX-IX of Figure 8, Figures 1 0 and 1 1 are perspective views from below, which respectively represent the dismembered apparatus while the container cover can not be coupled to the motionless support and the apparatus with the container engaged on the immobile support ready to be placed on the motor box. Detailed description of the invention Only the elements necessary for the understanding of the invention have been represented. To facilitate the interpretation of the designs, the same elements carry the same references in all the figures. Figure 1 illustrates a food preparation household appliance according to the invention having a drive box 1, a work container 2 designed to be placed on the drive box 1 according to several angular positions and a cover 3 intended to close the work container 2. The work container 2 has a cover 4, preferably glass, which has a coupling sleeve 40 at its lower end, visible in figure 1 0, which is screwed onto an immobile support 5 that supports a working instrument 6. This working instrument 6 is
intended to be fixed by rotation by means of a motor, not represented on the figures, integrated in the drive box 1. According to FIG. 2, the drive box 1 has a series of control buttons 1 0 for selecting different speeds of rotation of the motor and a receiving pedestal 1 1 of the support 5 of the container having two centering relieves 1 1 0 on which the support 5 can be coupled according to four angular positions displaced one with respect to the other by 90 °. Advantageously, the receiving pedestal 1 1 has two spring tongues 1 1 1 arranged symmetrically to each other and provided with pads which cooperate with the immobile support 5 to maintain the latter in a position inserted in the receiving pedestal 1 1. The center of the receiving pedestal 1 1 has a rotating distributor 1 2 in which a cover 60, visible in FIG. 4, is coupled and which forms a single piece with the working instrument 6 while the support 5 is placed on the receiver pedestal 1 1.
The receiving pedestal 1 1 also has a guide pin 14 arranged on the edge of one of the centering reliefs 1 1 0 so that between the steering pin 1 3 and the centering relief 1 1 0, a groove is provided. access to a space that receives a security command 7, represented in dotted lines on the figures, being able to move vertically inside the motor box 1, this security command 7 is fixed at a high position by means of a spring 9, represented
in lines shown in the figures. This safety command 7 has a profile 70 which cooperates with a switch 9 arranged on the power supply circuit of the motor to close the latter when the safety command 7 moves downwards against the force of the spring 8, the switch 9 contrarily opens while the safety command 7 is in the high position, illustrated in fig. 2, preventing the operation of the motor if the user operates one of the command buttons 1 0. According to figures 3 and 4, the support motionless 5 presents a skirt 50 around a safety crown 51 that supports a conveyor in which the working instrument 6 is mounted in a rotary manner. The safety crown 51 has an assembly sleeve 510 which is formed between the central opening 500 of the skirt 50, the skirt 50 covers the periphery of the assembly sleeve 51 0. The assembly sleeve 51 0 is provided with an appropriate internal thread to allow the coupling sleeve 40 to be screwed onto the container cover, the crown 51 has at the base of the assembly sleeve 51 0 an annular seal 51 1, preferably made of elastomeric material, on which the lower end of the sleeve is applied. coupling 40 of container cover 4. More particularly according to the invention, a safety crown 51 is mounted rotatably inside the
skirt 50 between two end positions, preferably angularly offset by 30 °. For this purpose, the safety crown 51 is fixed on the skirt 50 by means of two screws 52 which is inserted into the bolts 501 arranged symmetrically in relation to the center of the skirt 50, these bolts 501 pass through the channels 512 in the shape of an arc. Circle arranged symmetrically on the crown 51, these channels 512 have a length slightly greater than the diameter of the bolts 501 so as to allow the free rotation of the crown 51 between the two ends of the channel 51 2. In order to ensure the axial immobilization of the crown 51 on the skirt 50, the screws 52 have a head whose length is greater than the length of the channel 51 2, the height of the bolts 501 are adapted so that there is a slight axial movement between the crown 41 and the skirt when the screws 52 are screwed onto the bolts 501. Advantageously, the crown 51 is retained by means of springs 53 in a rest position as illustrated in figures 5 and 6, in which the bolts 501 are at a first end of the channel 512, the crown 51 can be moved by means of rotation against the spring 53 towards an active position, such as that illustrated in FIGS. 8 and 9, in which the bolts 501 are at the second end of the channel 512. The crown 51 is preferably immobilized in the position activated by means of two notches 51 3 arranged on the edge of the channels 512, the notches 51 3 have a height of the order of 1 to
2 mm and having on one side a progressive slope and on the other side a front wall that cooperates with a wall 502 of the skirt 50 to screw the crown 51 contrary to the retraction force generated by the springs 53. According to the figure 3, the crown 51 has two screws 54 disposed symmetrically in relation to the center of the crown 51, these screws 54 have a central part sliding radially through a guide rail 514. In FIG. 3, the screws 54 shown in FIG. Continuous lines correspond to the disassembled screws of the crown 51, for greater visibility. Each screw 54 has a tip 540 which can pass through a side opening of the assembly sleeve 51 0 to make it go inside the latter, this end 514 of the screw is beveled in such a way that the pressure exerted by the lower end of the coupling sleeve 40 of the cover, after screwing the cover 4 onto the immobile support, generates a radial velocity on the screw 54 towards the exterior of the crown 51.
Each screw 54 also has a hook-shaped head 541 which cooperates with a wall 503 of the skirt, which is more visible in FIG. 4, locally has a marking 504, the wall 503 extends spirally from the tip of the 504 mark, progressively approaching it. from the center of the skirt and away from the mark 504. According to figure 4, the crown 51 has, on its lower face intended to move with respect to the receiving pedestal
1 1, four cams 51 5 are intended to cooperate with the safety command 7 of the box when the container 2 provided with its support 5, is disposed on the pedestal 1 1 of the drive box, which will be described in more detail in the following description. Figures 5 and 6 illustrate the stationary support 5 while the cover 4 of the container is no longer screwed in the latter. According to these figures, the safety crown 51 is now retained by the springs 53 in the rest position in which the bolts 51 0 are embedded against the first end of the channels 512 in such a way that the safety cams 51 5 are displaced angularly 30 ° in relation to the position they occupy when the safety ring 51 is in its active position. In this position of the safety crown 51, the head 541 of the screw is supported against an oblique division 505 of the skirt in such a way that the screws 54 move radially towards the inside of the safety crown 51, as can be observed in Figure 6. A manual rotation of the safety crown 51 against the forces generated by the springs 53 is carried out by the head 541 of the screw which is embedded against the mark 504 of the wall. Preferably, the surface of the mark 504 on which the head 541 of the screw 54 is embedded after a rotation is slightly inclined in relation to the radial axis y and cooperates with a surface of the head 541 having a corresponding inclination so as to be generated an effort
radially on the screw 54 which tends to remain towards the inside of the safety crown 51. If the support 5 is placed only on the receiving pedestal 1 1 of the driving box, as illustrated in figure 7, the safety cams 51 5 are displaced relative to the safety command 7 so that no pressure is applied on this last one that belongs in an elevated position. The safety switch 9 then remains in the open position in such a way that the bearing on any one of the command buttons 10 of the drive box 1 will not cause the engine to start. Figures 8 and 9 illustrate the container 2 when the cover 4 is correctly screwed onto the movable support 5. According to these figures, when the user screws the cover onto the immobile support 5, the lower part of the coupling sleeve 40 is inserted in the assembly sleeve 51 0 of the safety crown 51 in such a way that the end of this coupling sleeve 40 first of all moves on the beveled end 540 of the screw 54 and radially pushing the latter outwards, which causes a slight rotation of the safety crown 51 under the thrust of the head 541 of the screw against the oblique division 505 of the skirt 505 and the escape of the head 541 above the mark 504 of the wall 503. The continuation of the closing movement of the cover 4 on the immobile support 5 pushes the lower end of the sleeve
coupling 40 towards the contact of the seal 51 1 of the crown, which then generates, by friction an important torque of rotation which causes the rotation of the safety crown 51 in the compression direction of the springs 53 reach the second end of the channel 51 2, as illustrated in figures 8 and 9. The safety crown 51 is then immobilized in that position by means of the notches 51 3 which engage against the edge of the wall 501. The safety crown 51 is then in the active position having effected a rotation of the order of 30 ° in relation to its rest position. If the assembled container 2 is pushed towards the receiver support 1 1 of the drive box, as illustrated in figure 1, one of the four safety cams 51 5 is in relation to the safety command 7 and moves to this one. Lastly, in such a way that the profile 70 of this safety command 7 closes the switch 9 and authorizes the operation of the motor after the support on one of the command buttons 1 0. Finally when the user unscrews the cover 4 of the poise motionless 5, for example to facilitate cleaning of the container 2, the torque generated by the friction of the lower part of the coupling sleeve 40 of the cover on the seal 51 1 of the crown causes the uncoupling of the immobilization notches 51 3 of the crown, then the return of the crown 51 to the resting position under the force of the spring 53. Thus an appliance is obtained for the preparation
of food provided with a safety device that prevents any operation of the motor box when the container is not perfectly assembled, this means when the cover is not screwed correctly on the immobile support. A device therefore makes it possible to prevent all operation of the drive box only with immobile support, because it would be very dangerous for the user, but also the operation of the drive box when the cover is badly placed on the immobile support with the risk of imperfections that this causes. Such a safety device also has the advantage that it does not need the presence of any particular appendix in the container cover in such a way that that cover can be manufactured very simply and at a lower cost. Of course, the invention is not limited to the described and illustrated embodiment that has been given by way of example. Modifications are possible, in particular from the point of view of the constitution of the different elements or by means of the substitution of equivalent techniques, without departing from the protection range of the invention. Thus, in a variant of simplified embodiment of the invention, the crown retaining spring can be suppressed in such a way that the safety crown will remain in its rest position only by the torque generated by the friction of the end of the coupling sleeve. on the seal of the safety crown after unscrewing the container cover.
Thus, in another variant embodiment, the retaining means retain the screws in their screwed-in position, they can be constituted by springs.