23, after the start of the pressure on the trigger.  DESCRIPLON DU MODEFJlECLMON PICULIM Referring to the numbering indicated in the figures, we can see that the piezoelectric mechanism for gas lighters recommended by the invention, presents, like others of its kind, two telescopic bodies referenced with numbers 1 and 2, the reference 1 corresponding to the interior and the 2 to the exterior Figure 2 shows the position occupied by the piezoelectric element 3 inside the telescopic body 1, which is immobilized between the anvil 4 and the abutment or base 5 on which the striker hammer 6 strikes, which moves by guiding in the cylindrical axial recess 7 of the internal body 1 (see  The anvil 4 penetrates adjusted by the orifice with quadrangular section.  the space presented by this upper part of the body 1, further comprising a pair of projections 8 on two of its opposite faces, by means of which  obtains the blocking of the anvil when they enter the respec-  tives windows 9 provided in the body 1 (see Figures 4 and 6).  The abutment piece 5 on which the impact hammer 6 strikes, for its part has a cylindrical shape staggered so as to  define an upper half with a larger diameter than the lower one.  This offset is supported on an annular centering boss 10 of  the cylindrical recess of the internal body 1, so that the cylindrical portion  drique with smaller diameter of the abutment 5 remains housed in this zone  axial of smaller diameter of the internal body 1.  The striker hammer 6, the geometry of which is clearly visible in FIGS. Il est ainsi possible de trouver des solutions exactes au problème des structures lamellaires, particulièrement pertinentes dans le cas des ferroélectriquesLa question de la propagation des ondes élastiques dans les milieux piézoélectriques est particulièrement importante dans la mesure où un très grand nombre d'applications de la piézoélectricité en tirent parti.

0000219273 00000 n h�b```�L �#1�A�D�b�,N�i``X��������٪��g�3�Y�|�O2���mힾ��APP���$����2:::��A �Mr;�6;���h m�.`I!��X#��3�('0�0�`�~�+�C�!k���_��e@��U��34/v�� ��p� ��Y� ����bq�T`�aHe�v`[�4����.S ��f�97tLL��2�R��9��7(80̀��49 �T���tq@� %,N� endstream endobj 21 0 obj <>/Metadata 18 0 R/Pages 17 0 R/Type/Catalog/ViewerPreferences<>>> endobj 22 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text]>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 23 0 obj <> endobj 24 0 obj <> endobj 25 0 obj <> endobj 26 0 obj <> endobj 27 0 obj <>stream Aujourd'hui, ce sont les céramiques multicouches qui sont traditionnellement utilisées dans les actionneurs piézoélectriques. 0000001997 00000 n �Ȑz���>|}��2��MG���H��rh�e�� ��FeT�a[cLwz#>gH������C���6q ���c����r"��\< �t����-����bO���u:j�v�T�D9��P��S'__qQ/cR�xh��2�%m�~ֺ���fj�D��ʞ�ьJGCBV�S���H�%�T��W assembly faults of its various components, as well as between the piezoelectric mechanism itself and the body of the lighter, this improvement being obtained without the contribution of a  At present, even if the outside contour of the telescopic assembly is quadrangular and the whole mechanism is housed in a compartment provided for this purpose in the body of the lighter, the two components must not have relative rotation, reason for which in some cases this problem is solved by ensuring that the inner section of the outer body and the outer contour of the inner body are other than circular, and of oblong shape in order to make possible the introduction of a hammer hammer provided with fins integral diametral, which can subsequently adopt a rotary position  so as to fit into the existing windows in the other teles body  copic, these asymmetrical forms being difficult to shape.  In other cases, the sections mentioned are circular, which implies the materialization of the diametrical projections of the striker in the form of a stud, the mounting of which must take place after the introduction of the hammer and simultaneously with the compression carried out on the telescopic assembly The assembly of this dummy stud considerably increases the manufacturing costs of the part itself, as well as  The same company requesting the present invention is pro-  owner of the invention patent P-8902741, describing and claiming a piezoelectric mechanism for gas lighters in which the above problems were solved, or at least advantageously lessened, both in the economic field and in the functional aspect and structural In the mentioned invention patent, we manage to deprive of  relative angular displacement of the two telescopic components, pre-  seeing in the external body a pair of pins acting as a gou-  and which slide inside the same grooves provided in the  internal telescopic body for axial movement of the percussion hammer  tor, reason why these grooves must have a greater length than that necessary for guiding the hammer. 0000618611 00000 n Merci pour vous infos !----- Aujourd'hui . We succeed in reducing the path traveled by the electric current, because the latter circulates only through the anvil, the element piezoelectric, the hammer stopper piece and the external telescopic body, unlike other previous mechanisms in which current also passed through the springs which assist the hammer hammer and the telescopic assembly Despite the short distance of this path and the fact that the electric current flows from the striker stop part serving as the lower seat of the piezoelectric element and to the pins of the external telescopic body at the time of the production of the spark, nevertheless there is a slight clearance in the contact surface of these elements,  which can cause misfires on ignition or cause deviations.  of the current by another slightly longer path, especially if there is not a perfect seat of the hammer on the stop piece, and  this on the inside of the piezoelectric element.  In all cases, the spring which assists the impact hammer is  completely or partially guided inside the telescopic body  front of housing with the hammer, its other end bearing on a cover which is provided at the other end of this telescopic body at  by means of sawtooth projections which are wedged in side windows  rales provided for this purpose in the walls, on both sides of the telesco-  stings, becoming immobilized in this fixed position.  it was found that the entire piezoelectric mechanism, that is to say  say the telescopic assembly with its ancillary elements, has a slight play in its housing inside the body of the lighter, mainly in the axial direction, which results in an undesirable movement of the push button.  In addition, as soon as the cover or the inner base of the  seems telescopic rests directly on a stud emerging from the bottom of the body housing and which has, as we know, its end ending in a conical shape introduced into a small orifice or mortise  arranged for its seat and contributing to the lateral immobilization of the mete  piezoelectric canism, the whole is thus endowed with a certain rigidity, which determines the accumulation of games and, ultimately, we notice a  slight movement of the piezoelectric mechanism by actuating the push-button  evening and, even, that it does not manage to completely recover its rest position To try to iron out this problem, even if it means adding to and complicating the device, we are currently mounting an additional spring interposed between the bottom of the housing for the piezoelectric mechanism and  the lower cover thereof; spring which is otherwise rendered necessary  in some of the known piezoelectric mechanisms in order to be able to open and recover gas during the rocking movement of the  In order to resolve the drawbacks mentioned above and  obtain the recommended characteristic advantages, the piezo mechanism  electric for gas lighters, constituting the object of the invention, comprises in particular a couple of telescopic bodies, of circular section, which are devoid of relative rotation by means of an external angular piece which is fixed to the internal telescopic body by one of its fins, while the other is disposed tangentially to the outside of one of the faces of the external telescopic body To do this, one of the fins of the angular part has a central longitudinal groove, in which transversely inserts the internal telescopic body, provided for this purpose with two diametrically opposite parallel notches, so that this angular piece manages to come into contact with the stopper part of the hammer hammer, which occupies, as we previously indicated , an intermediate position between the latter and the crystal or piezoelectric element We will comment more on this in  The recovery spring from the maximum spacing position of  the telescopic, or mechanism rest, outer casing  the internal telescopic body, resting precisely on the  angular piece Its other end pushes the telescopic body frontally  By this arrangement, the external spring is always in an axially distant position from the piezoelectric element, since the latter remains placed beyond the abutment piece facing the angular piece of  The spring assisting the hammer hammer is perfectly guided in the cylindrical axial recess of the internal telescopic body, and at the very moment when the impact of the hammer hammer occurs it remains  The electric current carries out a short course, waited that it passes directly and by a good contact from the base of the striker, that is to say from its stop-piece, to the metallic angular piece, reason for which the external telescopic body does not need to be plastic  conductive and therefore manufacturing is more economical.  The free fin of the angular piece, functioning as an anti  bend of the components of the telescopic assembly, ends in a ramp and its slope regulates the opening of the gas during the entire stroke in withdrawal of the telescopic assembly when the lighter plunger is actuated,  the spark itself occurring at the last moment of this journey.  Another characteristic brought by the invention as an additional improvement of the mechanism comes given by the fact that the functional behavior of the lighter is improved, as soon as the possible axial misalignment existing in the piezoelectric mechanism is completely eliminated by following the accumulation of games  during the assembly of its various components, as well as between the mechanic  piezoelectric nism itself and the lighter body, which is what we  comes without the need to add a third additional spring interposed between the bottom of the lighter body housing and the cover of the lower telescopic body of the piezoelectric mechanism, such as  Thus, in accordance with the invention, the closure cover of the free end of the telescopic body which is housed inside the body of the lighter -which is precisely, as we will see in relation to the  figures, the one that closes the body with larger section of the teles-  copic, giving at the same time seat to the support spring of the hammer-, is a closure cover axially movable with regard to the body which it closes, since it has been provided that the windows for anchoring  sawtooth projections of the lower cover are biased in order to  put this game In the rest position of the mechanism, the lower cover  laughter stands in the most distant position vis-à-vis the mouth of the lower telescopic body, because of the presence of the striker's own support spring, this is why it is in its position the more relaxed, which results in an extended service life of the  spring which no longer needs to be previously held under tension.  By means of this arrangement, the piezoelectric mechanism  remains mounted in the rest and total recovery position of the button-  push button as a result of the special mounting of this spring, whereupon by pressing to cause ignition, this spring is first compressed until the cover reaches the insertion position, followed by compression of the external spring assisting the telescopic assembly; then, simultaneously with this movement, the compression spring of the impact hammer also takes place to strike the piezoelectric crystal at the end of this compression course  of the telescopic assembly, the operation of which is well known.  To facilitate understanding of the characteristics of the invention,  tion and forming an integral part of this descriptive memory, are annexed a few sheets of plans, the figures of which are illustrative but not limiting, represent the following:  Figure 1 It is a longitudinal perspective view of the piezoelectric mechanism for gas lighters, object of the invention, in the armed position and housed in the frame of the lighter, the latter being shown  Figure 2 It is a view similar to that of Figure 1, in  relaxed position and not including the lighter body.  Figure 3 Perspective view of the interior telescopic body.  Figure 4 Side perspective view of what is shown  Figure 5 It is a longitudinal section following the line  Figure 6 This is a cross-sectional view of what is  Figure 7 This is a section through the section line D-D of the  Figure 8 It is a section through the cutting line A-A of the  Figure 9 This is a bottom plan view of what is shown  Figure 10 It is a perspective view of the outer telescopic body.