FR2489514A1

FR2489514A1 - DEVICE FOR SIGNALING THE DEGREASING OF A VEHICLE TIRE AND VALVE FOR NORMALLY RETAINING A GASEOUS FLUID IN AN ENCLOSURE

Info

Publication number: FR2489514A1
Application number: FR8116548A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1980-08-29
Filing date: 1981-08-31
Publication date: 1982-03-05
Also published as: BR8105510A; DE3133071A1; GB2082734B; AU7436281A; HK12585A; SE8104740L; GB2082734A; JPS6244150B2; IT1209893B; JPS5773279A; AU550703B2; ES505029A0; ES8205662A1; ZA814946B; CA1170922A; IT8149200A0

Abstract

L'INVENTION CONCERNE UN DISPOSITIF POUR SIGNALER LE DEGONFLEMENT D'UN PNEUMATIQUE DE VEHICULE. CE DISPOSITIF, INCORPORE A UNE VALVE DE GONFLAGE, COMPORTE UN CORPS TUBULAIRE DANS LEQUEL EST LOGE UN OBTURATEUR 16 QUI PORTE NORMALEMENT CONTRE UN SIEGE PRESENTE PAR L'EXTREMITE INFERIEURE DU CORPS LORSQUE LA PRESSION REGNANT DANS LE PNEUMATIQUE EST DE VALEUR CONVENABLE. EN CAS DE BAISSE DE PRESSION, L'OBTURATEUR 16 EST ELOIGNE DE SON SIEGE PAR UN RESSORT 19 ET LE FLUIDE SOUS PRESSION PENETRE A L'INTERIEUR DU CORPS TUBULAIRE AFIN DE SOULEVER UN ENSEMBLE 21 A PISTON POUR ARRETER L'ECHAPPEMENT DU FLUIDE COMPRIME. DOMAINE D'APPLICATION: CONTROLE DE LA PRESSION DE GONFLAGE DES PNEUMATIQUES DE VEHICULE.THE INVENTION RELATES TO A DEVICE FOR SIGNALING THE DEFLATION OF A VEHICLE TIRE. THIS DEVICE, INCORPORATED IN AN INFLATION VALVE, INCLUDES A TUBULAR BODY IN WHICH IS LOCATED A CLOSURE 16 WHICH NORMALLY WEARS AGAINST A SEAT PRESENTED BY THE LOWER END OF THE BODY WHEN THE PRESSURE IN THE PNEUMATIC IS OF A SUITABLE VALUE. IN THE EVENT OF A PRESSURE DROP, THE SHUTTER 16 IS MOVED FROM ITS SEAT BY A SPRING 19 AND THE PRESSURIZED FLUID ENTERS INSIDE THE TUBULAR BODY IN ORDER TO LIFT A PISTON ASSEMBLY 21 TO STOP THE EXHAUST OF THE COMPRESSED FLUID. FIELD OF APPLICATION: CONTROL OF THE INFLATION PRESSURE OF VEHICLE TIRES.

Description

L'invention concerne un dispositif de signali-The invention relates to a signaling device

sation utilisant certains des principes mis en oeuvre dans un appareil décrit dans les brevets des Etats-Unis using some of the principles embodied in an apparatus described in US Patents

d'Amérique N0 3 717 845, N0 3 827 393 et N0 3 828 149. No. 3,717,845, US Pat. Nos. 3,827,393 and 3,828,149.

Cependantle dispositif selon l'invention présente de nombreuses différences avec l'appareil antérieur. Dans le dispositif selon l'invention, le fluide gazeux sous pression s'échappant de l'enceinte est utilisé pour actionner un élément de signalisation vizuelle et seule la quantité de fluide indispensable à cette fonction However, the device according to the invention has many differences with the prior apparatus. In the device according to the invention, the gaseous fluid under pressure escaping from the chamber is used to actuate a visual signaling element and only the quantity of fluid essential for this function.

peut s'échapper de l'enceinte. Lorsque l'élément de signa- can escape from the speaker. When the sign

lisation a été actionné pour produire un signal indiquant une diminution de pression, toute décharge du fluide gazeux de l'enceinte est empêchée, de sorte que le fluide the actuation has been actuated to produce a signal indicating a decrease in pressure, any discharge of the gaseous fluid from the chamber is prevented, so that the fluid

gazeux est retenu le plus possible à l'intérieur de l'en- gas is retained as much as possible inside the

ceinte, dans les conditions présentes. surrounded, in the present conditions.

Le dispositif selon l'invention est fondamenta- The device according to the invention is fundamentally

lement et de préférence utilisé comme accessoire composé and preferably used as a compound accessory

de remplacement d'une valve connue et classique de pneu- replacement of a known and conventional tire valve

matique dont il possède les caractéristiques fonctionnelles tout en assumant, en plus, la fonction d'un indicateur de it possesses the functional characteristics while assuming, in addition, the function of an indicator of

perte de pression du pneumatique.pressure loss of the tire.

L'invention sera décrite plus en détail en regarddu dessin annexé à titre d'exemple nullement limitatif et sur lequel: The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting example and in which:

la figure 1 est une élévation d'une roue typi- FIG. 1 is an elevation of a typical wheel

que de véhicule portant un bandage pneumatique auquel est associé le dispositif selon l'invention; la figure 2 est une coupe axiale partielle, à échelle agrandie, du dispositif selon l'invention, cette that vehicle carrying a tire with which the device according to the invention is associated; FIG. 2 is a partial axial section, on an enlarged scale, of the device according to the invention, this

vue montrant les positions relatives des éléments mécani- view showing the relative positions of the mechanical elements

ques du dispositif alors que la pression du fluide à l'intérieur du pneumatique est égale ou supérieure à la valeur souhaitée, pression audessous de laquelle le dispositif de signalisation est actionné afin d'indiquer que la pression régnant à l'intérieur du pneumatique est inférieure à la valeur souhaitée; la figure 3 est une coupe analogue à celle de la figure 2, mais montrant les positions relatives modifiées of the device while the pressure of the fluid inside the tire is equal to or greater than the desired value, the pressure below which the signaling device is actuated to indicate that the pressure prevailing inside the tire is less than to the desired value; FIG. 3 is a section similar to that of FIG. 2, but showing the modified relative positions

des éléments, ce qui se produit à la suite d'une diminu- elements, which occurs as a result of a decrease in

tion de la pression du pneumatique au-dessous d'une valeur souhaitée; et la figure 4 est une coupe, analogue à celle des figures 2 et 3, montrant l'application du dispositif selon l'invention à un manomètre de gonflage du pneumatique, à un inflation of the tire pressure below a desired value; and FIG. 4 is a section similar to that of FIGS. 2 and 3, showing the application of the device according to the invention to an inflation manometer of the tire, to a

raccord de tuyau de gonflage ou autre, utilisés pour dé- inflation hose connection or other, used to de-

terminer la pression régnant dans le pneumatique ou pour end the pressure in the tire or

regonfler ce dernier, respectivement. reinflate the latter, respectively.

Le dispositif selon l'invention comprend plus particulièrement un corps sensiblement cylindrique et creux, indiqué globalement en 1 et qui est représenté comme étant fixé à une roue 2 de véhicule sur laquelle est monté un bandage pneumatique 3. Le corps 1 est fixé à la roue 2 par introduction dans un trou de la jante de The device according to the invention more particularly comprises a substantially cylindrical and hollow body, indicated generally at 1 and which is shown as being fixed to a wheel 2 of the vehicle on which a tire 3 is mounted. The body 1 is fixed to the wheel 2 by introduction into a hole in the rim of

cette roue, jante de laquelle il fait saillie vers l'inté- this wheel, rim of which it projects towards the inte-

rieur, en direction de l'axe de la roue, et il communique avec l'intérieur du pneumatique. Des moyens appropriés, comprenant un joint 4 et un écrou 5, vissé sur le corps 1, assurent un montage étanche à l'air entre l'extérieur du corps 1 et la jante 2'de la roue, autour du trou dans in the direction of the axis of the wheel, and communicates with the inside of the tire. Suitable means, comprising a seal 4 and a nut 5, screwed onto the body 1, provide an airtight assembly between the outside of the body 1 and the rim 2 'of the wheel, around the hole in

lequel passe le corps 1, ce dernier comportant un épaule- which passes the body 1, the latter comprising a shoulder-

ment 6 qui forme un siège pour le joint 4. 6 which forms a seat for the seal 4.

L'alésage ménagé à l'intérieur du corps est divisé en deux chambres espacées axialement par une rondelle 10 d'entretoisement qui est en contact avec un épaulement annulaire 11 de l'alésage, épaulement auquel cette rondelle est fixée. La chambre 12 contient, à proximité de la roue 2, des éléments de valve de retenue The bore formed inside the body is divided into two chambers spaced axially by a spacer washer 10 which is in contact with an annular shoulder 11 of the bore, shoulder to which this washer is fixed. The chamber 12 contains, in the vicinity of the wheel 2, valve elements retaining

de pression, assurant normalement le maintien de la pres- pressure, normally ensuring the maintenance of pressure

sion du fluide à l'intérieur du pneumatique, tandis qu'une seconde chambre 13 contient des organes de signalisation qui sont actionnés lorsque la pression du pneumatique sion of the fluid inside the tire, while a second chamber 13 contains signaling members which are actuated when the pressure of the tire

descend au-dessous d'une valeur prédéterminée. falls below a predetermined value.

La chambre 12, lorsqu'elle est considérée en progressant à partir de l'extrémité intérieure du corps qui pénètre à l'intérieur du pneumatique 3 avec lequel elle communique, présente une gorge annulaire 14 dans laquelle est logé un anneau fendu et élastique 15 de retenue d'un obturateur ou clapet circulaire 16 portant un joint annulaire 17 qui peut entrer en contact avec un siège annulaire 18 de clapet formé à l'intérieur du corps et pouvant normalement coopérer avec l'obturateur afin d'empêcher l'air de s'échapper du pneumatique. Dans une forme préférée de réalisation, la surface supérieure de l'obturateur peut avoir une forme en coupelle> comme The chamber 12, when considered progressing from the inner end of the body which penetrates inside the tire 3 with which it communicates, has an annular groove 14 in which is housed a split and elastic ring 15 of retaining a shutter or circular valve 16 carrying an annular seal 17 which can come into contact with an annular valve seat 18 formed inside the body and can normally cooperate with the shutter to prevent air from s escape from the tire. In a preferred embodiment, the upper surface of the shutter may have a cup-like shape

indiqué en 16',afin de retenir plus fermement le joint 17. indicated at 16 'to hold the seal 17 more firmly.

Un ressort 19 de compression et d'étalonnage ou tout autre organe élastique approprié, intercalé entre l'obturateur 16 et la rondelle 10 d'entretoisement, porte par une prem!ers extrémité conLre la rondelle et tend à déplacer l'obturateur vers l'anneau 15 de retenue. La force de ce ressort est choisie conformément à la pression que l'on souhaite maintenir à l'intérieur du pneumatique et sa fonction est de soulever et d'écarter l'obturateur 16 et le joint 17 du siège 18 lorsque la pression régnant dans le pneumatique, par rapport à la pression ambiante extérieure, descend au-dessous d'une valeur choisie et prédéterminée. Le ressort et l'obturateur constituent donc des éléments d'une sralve différentielle, sensible A compression and calibration spring 19 or any other suitable elastic member, interposed between the shutter 16 and the spacer washer 10, carries by a first end against the washer and tends to move the shutter towards the retaining ring. The force of this spring is chosen according to the pressure that is desired to maintain inside the tire and its function is to lift and move the shutter 16 and the seal 17 of the seat 18 when the pressure prevailing in the pneumatic, with respect to the ambient ambient pressure, falls below a chosen and predetermined value. The spring and the shutter therefore constitute elements of a differential, sensitive sralve

à la pressions fonctionnant de la manière décrite. at pressures operating in the manner described.

La seconde chambre 13 contient l'élément de signalisation et son élément de commande qui sont alignés axialement dans l'alésage du corps, avec la chambre 12 contenant la valve. Un piston 21. de signalisation d'une faible pression de gonflage du pneumatique, ayant de préférence une couleur distinctive lui permettant d'être The second chamber 13 contains the signal element and its control element which are aligned axially in the bore of the body, with the chamber 12 containing the valve. A piston 21. for signaling a low inflation pressure of the tire, preferably having a distinctive color enabling it to be

vu aisément lorsqu'il fait saillie dans sa position ex- easily seen when it protrudes into its ex-

trême (figure 3), est logé et mobile à l'intérieur de la chambre 13 axialement au corps, et il porte une tête 20 d'indication qui fait normalement saillie légèrement de l'extrémité adjacente du corps. Le piston porte, dans des gorges annulaires appropriées, des bagues élastiques, de préférence en élastomère, supérieure et inférieure 23 et 24. Les gorges sont situées entre des tronçons du piston treme (Figure 3), is housed and movable within the chamber 13 axially to the body, and carries an indicating head which normally protrudes slightly from the adjacent end of the body. The piston carries, in appropriate annular grooves, resilient rings, preferably elastomeric, upper and lower 23 and 24. The grooves are located between sections of the piston

espacés axialement, dont le diamètre augmente progres- spaced axially, whose diameter increases progressively

sivement à partir de la tête 20, ces tronçons comprenant un tronçon intermédiaire 25 et aboutissant à une broche 27 qui fait saillie axialement du piston dans la chambre 12, comme décrit en détail ci-après. La paroi intérieure de la chambre 13 rejoint, This section includes an intermediate section 25 and terminating in a pin 27 which protrudes axially from the piston into the chamber 12, as described in detail below. The inner wall of the chamber 13 joins,

à proximité de son extrémité supérieure, par une transi- near its upper end, by a transient

tion progressive, la paroi d'une chambre 13' de plus progressive, the wall of a chamber 13 'more

faible diamètre. La zone de jonction est indiquée en 29. small diameter. The junction area is indicated at 29.

La chambre 13' aboutit à un épaulement 30 qui délimite un The chamber 13 'terminates in a shoulder 30 which delimits a

orifice 31 de sortie analogue à une chambre supérieure. outlet port 31 similar to an upper chamber.

Les parois intérieures des chambres ont un fini lisse afin d'assurer une étanchéité s'opposant à l'introduction de poussière ou d'autres corps étrangers aux points de contact avec les bagues 23 et 24. Le tronçon épaulé 30 The inner walls of the chambers have a smooth finish to provide a seal against the introduction of dust or other foreign matter at the points of contact with the rings 23 and 24. The shoulder portion 30

forme un siège annulaire espacé axialement vers l'inté- form an annular seat spaced axially towards the interior.

rieur de l'orifice 31 et, lorsque le piston dépasse vers l'extérieur du corps, la bague 24 est amenée en contact étanche avec ce siège. La paroi de la chambre 13', située axialement vers l'intérieur du siège 30, est en contact 1, and when the piston projects outwardly from the body, the ring 24 is brought into sealing contact with this seat. The wall of the chamber 13 ', located axially inwardly of the seat 30, is in contact

avec la bague 24 avec une étanchéité telle qu'elle empê- with the ring 24 with a seal such that it prevents

che tout échappement libre de l'air du pneumatique lorsque le piston dépasse par suite d'une libération de l'air du pneumatique dans le corps résultant d'un soulèvement de a free escape of air from the tire when the piston protrudes as a result of a release of air from the tire into the body as a result of a lifting of

l'obturateur 16 de son siège.the shutter 16 of its seat.

Le piston est normalement maintenu en position de retrait, dans laquelle il ne fait pas saillie (figure 2), par un ressort 28 de rappel intercalé entre ce piston et la rondelle 10 d'entretoisement. La chambre 13 présente un diamètre'sensiblement plus grand, vers l'intérieur de The piston is normally held in the retracted position, in which it does not protrude (FIG. 2), by a return spring 28 interposed between this piston and the spacer washer 10. Chamber 13 has a substantially larger diameter, towards the inside of

la chambre 13', contre laquelle porte normalement la - the chamber 13 ', against which normally wears the -

bague 24, afin de permettre à l'air de s'échapper ou de pénétrer lorsque le piston 20 est enfoncé à partir de sa ring 24, to allow air to escape or penetrate when the piston 20 is depressed from its

position normale, par exemple sous l'effet de l'applica- normal position, for example under the effect of

tion d'un manomètre G de pneumatique ou autre (figure 4) sur l'extrémité du corps 1, ou bien lors de l'introduction d'air dans le pneumatique de manière connue, à partir tire manometer G or other (Figure 4) on the end of the body 1, or when introducing air into the tire in known manner, from

d'une source d'air comprimé.a source of compressed air.

Ainsi qu'il ressort de manière évidente de la As is evident from the

description précédente, le dispositif de signalisation previous description, the signaling device

selon l'invention, dans sa forme de réalisation pour according to the invention, in its embodiment for

signaler une faible pression dans un pneumatique de vé- signal a low pressure in a tire of

hicule, peut remplacer les types connus de valve tels que ceux équipant normalement les pneumatiques pour en permettre le gonflage, et ce dispositif assume toutes of the known types of valves such as those normally fitted to the tires to allow them to be inflated, and this device assumes all

les fonctions des valves en signalant, de plus, l'appa- the functions of the valves by indicating, in addition, the

rition d'une faible pression de gonflage du pneumatique. a low inflation pressure of the tire.

Dans des conditions normales (figure 2), si on suppose que le pneumatique est convenablement gonflé, le contact de la bague 23 avec son siège dans l'orifice 31 situé à l'extrémité du corps 1 empêche l'introduction de matières étrangères à l'intérieur du corps, tandis que la pression régnant à l'intérieur du pneumatique maintient l'obturateur 16 et le joint 17 contre le siège 18 afin Under normal conditions (FIG. 2), if it is supposed that the tire is properly inflated, the contact of the ring 23 with its seat in the orifice 31 located at the end of the body 1 prevents the introduction of foreign matter into the air. inside the body, while the pressure prevailing inside the tire holds the shutter 16 and the seal 17 against the seat 18 so that

d'empêcher l'air de s'échapper du pneumatique. to prevent air from escaping the tire.

Cependant, en cas de perte de la pression régnant dans le pneumatique pour toute raison quelconque, la pression exercée contre l'obturateur 16 diminue de manière correspondante et, lorsqu'elle est descendue à une valeur inférieure à celle exercée contre l'obturateur 16 par le ressort 19 de compression, ce dernier soulève l'obturateur However, in the event of loss of the pressure in the tire for any reason, the pressure exerted on the shutter 16 decreases correspondingly and, when it has fallen to a value less than that exerted against the shutter 16 by the compression spring 19, the latter raises the shutter

de son siège (figure 3), ce qui permet à la pression ré- seat (figure 3), which allows the pressure to

gnant à l'intérieur du pneumatique de s'exercer contre le piston 26. Cette pression d'air, qui s'ajoute ou se combine à la force du ressort 28 de rappel, provoque un brusque soulèvement du piston vers la position montrée The air pressure, which is added to or combined with the force of the return spring 28, causes the piston to rise rapidly towards the position shown in FIG.

sur la figure 3. Etant donné que la bague 24 porte her- in FIG. 3. Since the ring 24 carries her-

métiquement contre la paroi de la chambre 13', empêchant- metrically against the wall of the chamber 13 ', preventing

tout échappement de l'air de l'intérieur du corps, la pression exercée contre le piston, associée à la force du ressort 28, déplace ce piston à force, axialement vers l'extérieur, dans la chambre 13'. Le piston est déplacé axialement vers l'extérieur jusqu'à ce que la bague 24, qu'il porte, s'applique contre le siège 30 (figure 3), any escape of air from the inside of the body, the pressure exerted against the piston, associated with the force of the spring 28, displaces this piston by force, axially outwards, in the chamber 13 '. The piston is moved axially outwards until the ring 24, which it bears, bears against the seat 30 (FIG. 3),

empêchant l'air de continuer à s'échapper et, simulta- preventing the air from continuing to escape and, simultaneously

némentfaisant apparaître, afin qu'il soit aisément visible, le tronçon 25 du piston ayant de préférence noticeably appear, so that it is easily visible, the section 25 of the piston preferably having

une couleur distincte,et fournissant donc à un observa- a distinct color, and thus providing an observa-

teur une indication de gonflage insuffisante du pneuma- an indication of insufficient tire inflation.

tique. Comme indiqué, le piston porte une broche 27 de guidage qui pénètre axialement dans le corps, vers l'obturateur 16, et dont la position et la longueur sont tick. As indicated, the piston carries a guide pin 27 which penetrates axially into the body, towards the shutter 16, and whose position and length are

telles qu'elle porte contre cet obturateur (figure 4) afin de faci- as it bears against this shutter (FIG. 4) in order to facilitate

liter les opérations normales d'entretien du pneumatique the normal tire maintenance operations

associé. Ainsi, lorsque, par exemple, on souhaite s'assu- associated. Thus, when, for example, one wishes to

rer de la pression régnant dans le pneumatique, le bossage classique d'enfoncement de la valve d'un manomètre G peut être appliqué sur la tête apparente 20 du piston afin d'enfoncer ce dernier, contre la force du ressort 28 de rappel et, par suite de l'entrée en contact de l'extrémité As a result of the pressure in the tire, the conventional depression of the valve of a pressure gauge G can be applied to the apparent head 20 of the piston in order to drive the latter against the force of the return spring 28 and, as a result of the coming into contact of the end

libre de la broche 27 avec l'obturateur 16, afin de sou- free of the pin 27 with the shutter 16, in order to

lever ce dernier de son siège et de libérer l'air du pneumatique pour actionner le manomètre G. De même, tout autre outil approprié peut être appliqué sur la tête du piston soit pour éliminer la pression du pneumatique af n de le dégonfler, soit pour introduire de l'air sous une pression prédéterminée dans le pneumatique afin de le gonfler comme souhaité. Il est évident que la broche 27 peut être fixée à l'obturateur 16 ou au piston 26, mais lift the latter from its seat and release air from the tire to actuate the pressure gauge G. Similarly, any other appropriate tool can be applied to the piston head to either eliminate the pressure of the tire to deflate it or to introducing air under a predetermined pressure into the tire to inflate it as desired. It is obvious that the pin 27 can be fixed to the shutter 16 or the piston 26, but

non aux deux.no to both.

En fait, le dispositif selon l'invention consti- In fact, the device according to the invention constitutes

tue un progrès et un perfectionnement très important dans ce domaine. Ce dispositif comporte un indicateur visuel d'une faible pression de gonflage d'un pneumatique, pouvant remplacer, sous la forme d'une unité composée, une valve de pneumatique telle que celles actuellement connues et utilisées. Le dispositif selon l'invention est conçu de kills a lot of progress and development in this area. This device comprises a visual indicator of a low inflation pressure of a tire, which can replace, in the form of a compound unit, a tire valve such as those currently known and used. The device according to the invention is designed to

manière à pouvoir être monté sur une jante de roue à l'ai- so that it can be mounted on a wheel rim to help

de de mécanismes de bridage ou à l'aide d'une embase élastique, du type à emboîtement, bien connue de l'homme of clamping mechanisms or using an elastic base, the type of interlocking, well known to man

de l'art.art.

Les fonctions de valve et d'indication de basse pression exigent un nombre de pièces inférieur à celui 24895i4 demandé dans le cas-o l'indicateur est joint à un corps Valve and low pressure indication functions require fewer pieces than 24895i4 requested in case the indicator is attached to a body

de valve classique et connu.conventional valve and known.

Le dispositif permet de mieux maîtriser l'écou- The device makes it possible to better control the listening

lement de l'air grâce à la disposition et à la coopération des diverses chambres et à l'action des bagues d'étanchéité airflow through the arrangement and cooperation of the various chambers and the action of the sealing rings.

du piston sur les parois de ces chambres. piston on the walls of these rooms.

Le dispositif selon l'invention améliore considérablement la sécurité en service. Ceci est dû en grande partie à l'utilisation de deux joints, à savoir un joint primaire P placé à l'intérieur de la jante et The device according to the invention considerably improves the safety in use. This is largely due to the use of two seals, namely a primary seal P placed inside the rim and

constitué par le contact de la garniture 17 de l'obtura- formed by the contact of the seal 17 of the obtura-

teur 16 avec son siège 18 sous la pression normale de gonflage du pneumatique, et un joint secondaire ou joint 16 with its seat 18 under the normal inflation pressure of the tire, and a secondary seal or seal

de sécurité BU constitué par le mécanisme à tige d'aver- safety device BU constituted by the rod mechanism of war-

tissement, l'étanchéité étant assurée entre la bague 24 et la partie recourbée 30 de la chambre 13', à proximité de l'orifice 31. La partie recourbée 30 constitue un siège de joint pour la bague 24 sous de faibles pressions de gonflage du pneumatique, lorsque le dispositif de the curved portion 30 of the chamber 13 ', close to the orifice 31. The curved portion 30 is a seal seat for the ring 24 at low inflation pressures when the device for

signalisation s'est déplacé en position d'extension. signaling has moved to the extended position.

L'invention peut être aisément adaptée à des systèmes d'indication sur le tableau de bord, ainsi qu'à The invention can easily be adapted to indicating systems on the dashboard, as well as to

la forme de réalisation visible sur place, comme décrit. the embodiment visible in the field, as described.

Un mouvement franc de la tête d'indication vers la position d'extension peut être aisément transmis à un système de type connu déclenchant un dispositif monté sur le tableau A free movement of the indication head to the extended position can be easily transmitted to a known type of system triggering a device mounted on the board

de bord.on board.

Le dispositif selon l'invention convient égale- The device according to the invention is also suitable

ment à des applications autres que celles mettant en oeuvre des indicateurs de pression de pneumatique. Il peut être utilisé dans tous les cas o il est nécessaire de commander l'écoulement d'un milieu fluide et o les applications other than those employing tire pressure indicators. It can be used in all cases where it is necessary to control the flow of a fluid medium and where the

caractéristiques indiquées ci-dessus sont très souhaitables. characteristics indicated above are very desirable.

Il va de soi que de nombreuses modifications peuvent être apportées au dispositif décrit et représenté It goes without saying that many modifications can be made to the device described and shown

sans sortir du cadre de l'invention. without departing from the scope of the invention.

Claims

Device for signaling the deflation of a vehicle tire, characterized in that it comprises a substantially cylindrical body (1) which has an axial bore and which is intended to be fixed to the tire (3) in such a way that first end of the bore communicates with the interior of this tire, the body having an annular valve seat (18) facing said end of the bore, an annular shoulder (11) facing said end from which it is further away as the seat, and an annular sealing surface that converges towards the opposite end of

the bore and which is farther from the first end

of the bore that the shoulder, a shutter (16) or valve, housed in the bore, can come into contact with the annular seat and being designed to be pushed against it by a pressurized fluid contained

in the tire, an elastic member (19) being

placed in the bore, in contact with the shoulder and

with the shutter, so as to tend to move the latter

deny towards the tire and away from the annular seat a substantially cylindrical element (21) of indication being disposed in the bore and being adapted to

protruding from the end of this bore remote from the tire.

when a gaseous fluid escapes from the tire through the shutter, a resilient annular sealing member (24) surrounding the indicating member and engageable with said converging annular sealing surface to retain inside the bore the gaseous fluid released in the latter as a result of a movement away from the shutter of its

seat under the action of the gaseous fluid under pressure

in the tire, and an elastic member (28)

to move the indicating member in the bore to maintain the sealing member in contact with said

sealing surface.

2. Device according to claim 1, characterized in that the indicating element carries a pin (27) which protrudes axially from this element in the body towards the shutter, and which can bear against the latter in order to move away from your seat

3. Device according to claim 1, characterized in that a pin (27) is interposed between the indication element and the shutter and can be

move axially in the body to lift the ob-

seat in response to an axial movement of the seat

element towards the shutter.

Valve for normally holding a gaseous fluid in an enclosure (3), characterized in that

it comprises a tubular body (1), a seat

annular valve (18), located in the body and coaxial with the latter, a valve shutter (16) located in the body and applied in sealed contact with the seat by the gaseous fluid contained in the chamber, a plunger (21) movable in the body and comprising an end which passes through an open end (31) of the body, away from the seat, a sealing member (24) carried by said end of the plunger cooperating with the

body, close to said open end, the closure

and the seat constituting a first seal (P) preventing

gases to escape from the enclosure, the end of the plunge

and the sealing member (24) constituting a second

seal (BU) preventing gas escape.

has an elongated tubular body (1), a seat

annular valve housing (18) disposed coaxially therewith, the seat being proximate an end of the tubular body operably connected to the housing, a valve shutter (16) located in the body and applied in sealed contact with the seat by the gaseous fluid contained in the enclosure, this shutter constituting with the seat a main seal (P) preventing the escape of gaseous fluid from the enclosure, a set (21) with pistons being mounted so as to be able to move in the tubular body in which it is housed beyond the seat, towards an open and opposite end (31) of said tubular body, this piston assembly acting during a reduction of the pressure exerted on the tubular body. shutter for sealing engagement with said end

opened and to make with it a secondary joint

(BU) preventing the gaseous fluid from escaping from the

girded.

6. Valve according to claim 5, characterized in that it comprises a first spring (19) housed in the body and acting on the shutter (16) so that,

when the pressure of the gaseous fluid contained in the

the force exerted by this spring on the obtura-

tor becomes dominant over the force exerted by the gaseous fluid. contained in the enclosure so as to disengage the shutter from its seat, which has the effect of

to apply the gaseous fluid under pressure against a

part of the piston assembly which is thus displaced outwards with respect to said open end and

opposite side (31) of the body, which activates the seal se-

condaire (BU) in the body.

Valve according to Claim 6, characterized in that the spring is a compression spring (19) having a force enabling it to move the shutter

when decreasing, below a pre-determined value

born, of the pressure of the gaseous fluid contained in the

you.

8. Valve according to claim 7, characterized in that a spacer washer (10) is disposed inside the tubular body, between its ends,

one end of the compression spring, opposite the end

mity bearing against the shutter, being in contact with

this spacer washer.

9. Valve according to claim 8, characterized in that it comprises a spring (28) of return housed in the tubular body, between the spacer washer and the piston assembly, the return spring acting to bring back the piston assembly to a sealing position of the open end after said piston assembly has been depressed with respect to said open end to allow measurement of the pressure of the gaseous fluid enclosed in the enclosure and to ventilate the gaseous fluid from the enclosure or to introduce

an additional amount of fluid in the enclosure.

Valve according to Claim 9, characterized

in that the tubular body comprises integral chambers

(12, 13, 13 ') of decreasing diameter of the ron-

said spacer being connected to said open end, the smaller diameter chamber 131 terminating near said open end and forming therewith an annular seat (30), the piston assembly comprising an annular annular head (20). low pressure, passing through said open end, and a piston (25) signaling axially spaced below this head, an annular groove, delimited between the head and the

signal piston, containing a ring (23) of

tightness which tightly bears against the edge of the

open (31) when the piston assembly is in

a withdrawal position in which the signal piston

The liner is housed inside the smaller diameter chamber, the sealing ring then preventing the introduction of dirt into the tubular body under normal working pressures of the gaseous fluid in the enclosure.

Valve according to claim 10, characterized

in that the piston assembly comprises an annular piston (26) spaced from the signal piston (25) and delimiting with it an annular groove housing a sealing ring (24) which can bear against a seat (30) formed by the connection zone between the smaller diameter chamber 13 'and the open end (31), this

ring (24) forming with said seat (30) said secondary seal

re (BU).

12. Valve according to claim 11, characterized in that it comprises a guide pin (27) attached to the annular piston (26) and projecting into the tubular body passing through the return spring, in the

spacer washer and in the compres-

this guide pin being intended to carry

against the shutter when the piston assembly is

dark, to lift it from its seat and thereby establish an air flow channel passing inside the tubular body, from the enclosure to said end

of this body, the return spring (28) being

awarded between the larger diameter piston (26) and the spacer washer when the piston assembly

is depressed.

13. Valve according to claim 11, characterized in that the inner diameter of the outermost chamber 13 'and the outer dimensions of the ring (24) disposed between the pistons are substantially equal, the ring being able to slide tightly. against the inner wall of the chamber 13 'when said ring moves towards the sealed position for

constitute said secondary seal (BU).

Valve according to any one of the claims

4, 5 and 13, characterized in that it is part of a deflation signaling device of a vehicle tire (3), this valve being fixed to

the rim (2) of a wheel of a vehicle, the lower end

tubular body through the rim and the bottom of this body communicating freely with the interior of the

of the vehicle, the components constituting the first

first seal (P) being arranged inside the tire,

the upper part of the body protruding outwards

rim, above the rim, and containing the components of the secondary seal (BU) to prevent gas from escaping during a pressure decrease

air in the tire.

15. Composed valve associated with a visual indicator of a loss of fluid pressure for a chamber (3) containing a fluid under pressure, characterized in that the indicator comprises a body (1) traversed by a

bore which leads to open ends, a first

first of these open ends communicating with the

interior of the enclosure, the bore being in the form of several chambers (12, 13, 13 ') connected to each other and whose diameters decrease from said first end open towards the second open end, closure members and sealing being mounted so as to be able to move in the bore,

a shutter chamber at the first end

mating, communicating with the bore, the closing and sealing members comprising a spring-return closing shutter (16) housed in the shutter chamber

and may come into contact with one end of the bore

to hermetically seal the bore to prevent fluid from flowing into said bores

predetermined pressure prevailing in the enclosure, this ob-

then constituting a first seal (P), the movable members also comprising a piston assembly (21) housed in the bore and carrying a ring (24), one (13>) of said chambers of the bore, close to said first open end, having a reduced outlet orifice (31) and constituting, with said ring, a second sealed closure (BU) which acts during a decrease in the pressure of the fluid in the chamber, which allows the spring (19) to move the shutter and movable members to move to a sealed position against a seat (30) close to said

second open end.

16. Composite valve according to claim 15, characterized in that the enclosure comprises a tire (3) of a vehicle, a rim (2) which carries the tire and which is traversed by a hole, the lower end

of the body (1) passing through this hole and penetrating into the

tire, the body being attached to the rim, the members constituting the first tight closure (P) being disposed inside the tire and the upper part of the body rising above the rim, the second sealing closure (BU) being disposed above the rim, the movable members being able to pass through said second open end of the body, under said predetermined pressure, and then constituting a visual indicator (21) rising above the body.