FR2659130A1 - GAS SUPPLY DEVICE FOR A GAS BURNER, PARTICULARLY FOR A FLAT-TYPE HOUSEHOLD APPLIANCE, EQUIPPED WITH AN ANGULAR DRIVE DEVICE. - Google Patents

Abstract

Gas supply device for a gas burner, in particular in a flat-type household gas appliance, comprising a gas inlet (3), a member (4) for adjusting the gas flow rate driven in rotation by a shaft of control (6) also movable axially (first direction), and extending downstream of the member (4), a safety valve (11) comprising an electromagnet supplied by a thermocouple and arranged downstream of the member (4) ), this valve having a valve (12) mounted on an axially movable arming rod (12a) (second direction) forming an angle with the shaft (6), and a movement return device (15) interposed between the 'shaft (6) and the cocking rod (12a) and comprising an elastically deformable member (16) having a first anchoring end (18) resting on two abutment surfaces (22a, 22b) perpendicular respectively to the first and second directions, a second end (19) of cooperation with the cocking rod (12a) and which e st free to move in the second direction and is supported against a stop surface (10a) perpendicular to the first direction, and a support zone (17) intended to cooperate with the shaft (6) and located between the first and second ends.

Description

Gas supply device for a gas burner, in particular for

  flat type household appliance, equipped

  an angular movement reference member.

  The present invention relates to improvements

  nements provided to gas supply devices for a gas burner, in particular in a flat-type gas household appliance, comprising: a gas inlet, a member for adjusting the gas flow driven in rotation by a control shaft which is also axially displaceable (first direction), said shaft extending downstream of the adjusting member, a safety valve comprising an electromagnet supplied by a thermocouple and disposed downstream of the adjusting member, this valve having a valve mounted on an axially movable cocking rod (second direction) making an angle with the aforementioned control shaft, and a movement return device interposed between the control shaft and the cocking rod of the valve The realization of gas appliances of the flat or extra-flat type (for example hobs fitted with at least one gas burner)

  significant problems in housing the components.

  As regards in particular the feeding devices

  gas intended to control the respective burners, it is common for the gas flow adjustment buttons to be located on the top of the hob, with the supply taps arranged vertically under the hob. However, the height too low mounting provided for these hobs does not accommodate, in the extension of the valves, some auxiliary components, such as for example safety valves supplied by thermocouple

manual arming.

  This is the reason why provision has been made, for this type of device, to house the safety valves no longer as an extension of the gas supply taps, but on the side thereof, for example approximately perpendicular to these. The return of the control movement, from an axial displacement of the valve actuation shaft

  gas flow adjustment, is ensured by

  return mechanisms using levers and / or

corner and cam systems.

  As a result, the movement return mechanisms

  used to date, whatever the constitution

  tion, are relatively bulky and delicate to set up, even to manufacture, and their operation can, due to the friction which is exerted between the moving parts and the risks of jamming, not be reliable, with as a consequence a duration of life

relatively short.

  The object of the invention is therefore essentially to propose a mechanism for angular return of linear movement for gas supply devices which

  rule out, as far as possible, the inconveniences

  nients of the equivalent mechanisms used so far, and which in particular is of simple structure, without articulated members, with a minimum of rubbing parts to reduce resistance and wear, which is easy to manufacture with simple tools, which is easy to set up, and which does not require adjustments or maintenance; in addition, a mechanism is also sought which is not bulky and which does not have a large transverse surface so as to be able to be mounted inside the gas circulation duct without significantly disturbing

gas flow.

  For these purposes, a gas supply device

  of the type indicated in the preamble is essential essential-

  Lement, according to the invention, in that it comprises an elastically deformable member having a first anchoring end in abutment on two abutment surfaces substantially perpendicular respectively to the first and second directions mentioned above, a second end which is intended to cooperate with the cocking rod of the safety valve and which is in abutment against an abutment surface substantially perpendicular to the aforementioned first direction, and a support zone intended to cooperate with the control shaft and located between the first and second ends. Thanks to this arrangement, the distance separating the first and second ends of the deformable member is modified under the action of the force exerted on the support zone by the control shaft and the axial displacement of the latter is transformed into a concomitant axial displacement of the cocking rod of the valve

security.

  Advantageously, the elastically deformed organ

  mable is not aligned with the first and second ends of said member, which makes it possible to increase the amplitude of the displacement of the second end of the deformable member for a given amplitude of

  axial displacement of the control shaft.

  In one embodiment, the elastic member

  cement deformable has the general shape of a V whose tip, constituting the abovementioned support area, is facing the control shaft; thus the displacement of the control shaft causing a crushing of the elastically deformable member results in a displacement of the same direction of the cocking rod of the safety valve. In a particularly interesting embodiment, the elastically deformable member consists of a metal wire having several winding turns in the connection area of the branches of the V and the support area consists of the external surface of the turns The manufacture of such a deformable member is therefore made from an inexpensive raw material (spring steel wire) and can be produced by bending and winding the wire with simple machines, inexpensive and commonly available in workshops; moreover, thus arranged, the elastic deformability of the member in question is increased and the amplitude of mutual spacing of its ends can

be high.

  Still with a view to simplifying the mounting of the device, the anchoring end of the deformable member is bent into a loop sheltered in a housing in the wall of the device body and the two corresponding abutment surfaces are surfaces

partially defining this accommodation.

  To then obtain a safe operation, avoid the shifting of parts one on the other, even their jamming, and to be assured of a correct transmission of the forces, it is advantageous to provide that the support zone of the member deformable is capped by a sliding guided stirrup and that the control shaft

cooperate with this stirrup.

  In such a configuration of use, the movement return member can be housed inside the gas supply pipe, under the gas tap, at the intersection of the pipe sections, which can be approximately perpendicular Mon

  to the other, respectively housing the supply tap

  tation and the safety valve: the stirrup is then guided by the wall of the duct section housing the supply valve, while the second end, free and movable, of the deformable member bears on the wall of the another section of conduit housing the

safety valve.

  It will be noted here that the arrangement in accordance with the

  vention has the very important advantage that the movement return member consists of a single piece and that its parts sliding on guide surfaces are few and may have strokes

  low There is therefore no risk of entrapment of

  elements or significant risks of wear and the duration of view of said member can be long In addition, in a practical embodiment, the control shaft is returned to the initial position by its own spring and it is possible to provide only cooperation by simple support between the control shaft and the first end of the deformable member, on the one hand, and between the ornamental stem of the safety valve and the second end, on the other hand

  share (in other words without positive link between these elements

  ment); thus each element remains free to return to its own initial position under the action of its own

  elasticity and / or its own elastic return means

  here again, the risk of jamming is avoided, which could prevent the valve from closing.

  safety valve if necessary.

  The invention will be better understood on reading

  the following detailed description of a mode of

  preferred embodiment given only as an example

  nonlimiting In this description, reference is made to

  attached drawing in which: FIG. 1 is a side view in section of a gas supply device for a gas burner arranged in accordance with the invention, and FIG. 2 is a front view, on a larger scale, a movement return member arranged according to

  the invention and mounted in the device of fig 1.

  The gas supply device 1 comprises a solid body 2 having a gas inlet orifice communicating horizontally with the conical plug 4, of vertical axis, of a tap 5 for adjusting the flow rate of

  gas This valve is fitted with a vertical action shaft-

  6 a whose upper free end is arranged

  to receive an actuation button (not shown).

  At its opposite end, the actuation shaft 6 a is provided with a projecting radial pin 7 engaged in a vertical groove 4 a of the plug 4 so as to create a coupling in rotation of the shaft and the plug while leaving the shaft 6 has free to move axially

relative to bushel 4.

  In addition, although this is barely visible in FIG. 1, the pin 7 extends beyond the aforementioned groove 4 a so that its free end is engaged in a groove 2 b hollowed out in the inner face of a cap 2 a covering the plug 4 and secured to the body 2 The groove 2 b has a vertical straight portion visible in FIG. 1 and a circular portion transverse to the shaft 6 a connected to

  the straight portion towards the bottom of it.

  Under the tree 6 a and in the extension of

  this extends a second tree or transmission tree-

  sion 6 which is permanently returned to bear against the lower end of the actuation shaft 6 a by

  a spring 8 The axial displacement of the action shaft-

  6ement therefore causes an identical displacement of the transmission shaft 6, while the latter remains free vis-à-vis the rotational movements of the actuation shaft 6a; conversely the return spring 8, by acting on the transmission shaft 6, also recalls the actuation shaft 6 a in the initial axial position.

  Although trees 6a and 6 are structural-

  separate for easy manufacturing and

  mounting of the parts, they are functionally soli-

  in terms of their axial displacements which are more particularly taken into consideration in the context of the present invention In what follows, these two shafts will therefore be designated globally under the unitary denomination of shaft 6 for controlling the tap

adjustment.

  The lower end of the shaft 6 extends axially in a section of conduit 9 at the outlet of the plug 4, which section 9 is connected at right angles to another section of conduit 10 in which is housed a safety valve 11 having an electromagnet powered by a thermocouple (not shown) The valve 12 of the safety valve bears in leaktight manner, under the action of a spring 12 b, against an annular seat 13 formed by a shoulder presented by the section of conduit 10 This valve 12 is carried at the end of a rod 12 a which is axially movable and which constitutes the core of the electromagnet or is integral

of the core of it.

  Downstream of the valve 12, the duct section 10 is connected to an outlet orifice 14 connected to the burner at

gas (not shown).

  The operation of the device which has just been described is as follows: the valve 5 being closed, the valve 12 of the safety valve is kept pressed on

  its seat by its spring 12 b For the start-up

  of the burner, the shaft 6 of the regulating valve is pressed axially. This axial movement is transmitted by means of a movement return device housed at the intersection of the sections of gas conduit 9 and 10, at the rod 12 a of the safety valve 11 so that this rod is moved in the direction of opening of the valve 12 (to the left in FIG. 1) The shaft 6 having been simultaneously rotated to open the valve 4 , the gas flows to the burner where it is ignited The above-mentioned thermocouple then generates an electric current which is applied to the electromagnet of the safety valve 11 The electromagnet, thus excited, maintains the rod 12 a in the position it occupies with the valve 12 in the open position As soon as the electromagnet is excited, the shaft 6 can be released and it is returned to the original axial position by the spring 8, retaining its angular position

  controlling the opening of the plug 4.

  As soon as the burner goes out, the electromagnet is no longer energized and, the rod 12 a is no longer retained, the spring 12 b recalls the valve 12 on its seat 13

  to stop the gas flow.

  The movement return device 15 comprises an elastically deformable member 16 (for example

  made of spring steel) has a general form

  curved or V-shaped rail with its convexity 17 facing the free end of the shaft 6 One of its ends 18 is anchored or in abutment (case shown) in the body 2 of the device, while its other end 19 remains free and is located opposite and close to

  the end of the rod 12 has the safety surface.

  When the shaft 6 is moved downwards, it exerts a force on the convex part of the elastically deformable member 16 and the latter, by crushing, elongates in horizontal projection The end 18 being anchored or in horizontal stop, the increase in horizontal length is transferred to the end 19 which pushes back the valve 12 and its rod 12 a and arms the safety valve 11 During this movement, the end 19 is supported (for example by a bent part 20) against the internal wall l Oa of the duct section 10 and

is guided by it.

  In the example shown in Figures 1 and 2, the deformable member 16 is constituted by a metal rod This rod can be single and be folded and wound in the manner of a clothespin spring and the upper loop 21 constitutes the part of the spring conferring the elasticity required for this member. The support of the shaft 6 is effected on this loop. The anchoring end 18 is folded in a loop on itself (see FIG. 1) to be fitted in a housing 22 constituted by an extension of the duct section 10 beyond the section 9 Thus this housing 22 has a first bearing surface 22 a which is perpendicular to the control shaft 6 and on which a part 18 abuts has ball 18 and a second bearing surface 22 b which

  is perpendicular to the arming rod 12 a and on the

  which abuts another part 18 b of the loop 18; so, loop 18 b loop 18 is in

  stop in the two directions according to which

  xercise support reaction efforts.

  To ensure correct cooperation between the end of the shaft 6 and the aforementioned loop 21, a stirrup 23 is provided which freely covers this loop 21 and on which the shaft 6 rests. This stirrup 23 is guided in its movement by its legs 24 which

  cooperate with the internal wall of the duct section 9.

  To avoid excessive sinking of the shaft 6 liable to cause harmful crushing of the deformable member 16, it is possible to have an annular ring 25 on the actuation shaft 6 a: this ring serves as an axial stop by cooperating with the edge of a cylindrical part of the cap 2 a forming a bearing 26 for the actuating shaft 6 a The position of the rod 25 can advantageously be chosen such that the arming of the safety valve 11 is obtained not only when this ring is supported against the bearing 26, but also if it is slightly spaced so as to soften the tap handling rules for the user.

  As it goes without saying and as it results from

  their already from the above, the invention is not limited

  in no way to those of its modes of application and reac

  which have been more particularly envisaged;

  on the contrary, it embraces all its variants.

the

Claims (6)

  1 Gas supply device for a gas burner, in particular in a flat-type gas household appliance, comprising a gas inlet (3), a member (4) for adjusting the gas flow driven in rotation by a shaft control (6) which is also axially displaceable (first direction), said shaft extending downstream of the adjustment member,   a safety valve (11) comprising an electro-   magnet powered by a thermocouple and arranged in   downstream of the adjusting member (4), this valve has   dant a valve (12) mounted on an arming rod (12 a) axially movable (second direction) at an angle with the aforementioned control shaft, and a device (15) of movement return interposed between the shaft control (6) and the cocking rod (12 a) of the valve,   characterized in that the gear return device   vement (15) comprises an elastically deformable member (16) having a first anchoring end (18) bearing on two abutment surfaces (22 a, 22 b) substantially perpendicular respectively to the first and second directions mentioned above, a second end (19) which is intended to cooperate with the cocking rod (12 a) of the safety valve and which is free to move in the second direction and is supported   against a substantially perpetual abutment surface (l Oa)   dicular to the first direction above, and an area   support (17) intended to cooperate with the drive shaft   and located between the first and second ends   mites, this whereby the distance separating the first and second ends of the deformable member is modified under the action of the force exerted on the support zone by the control shaft and the axial displacement thereof is transformed into a concomitant axial displacement of the cocking rod of the safety valve. 2 Device according to claim 1, characterized in that the bearing zone (17) of the elastically deformable member (16) is not aligned with the   first and second ends of said member.   3 Device according to claim 2, character-   laughed in that the elastically deformable member (16) has the general shape of a V whose tip (17), constituting the abovementioned support zone, is turned towards the control shaft (6), this thanks to what the displacement of the control shaft causing a crushing of the elastically deformable member results in a displacement of the same direction of the cocking rod of the safety valve.   4 Device according to claim 3, character-   laughed in that the elastically deformable member (16) consists of a metal wire having several   winding turns (21) in the connection area (17)   of the branches of the V and in that the support zone   is formed by the external surface of the turns.   Device according to any one of   claims 1 to 4, characterized in that the end   anchor (18) of the deformable member (16) is bent into a loop sheltered in a housing (22) of the wall of the device and in that the two corresponding abutment surfaces (22 a, 22 b) are defining surfaces partly this accommodation.   6 Device according to any one of the res-   dications 1 to 5, characterized in that the bearing zone (17) of the deformable member (16) is capped by a stirrup (23) guided in sliding and in that the shaft   control (6) cooperates with this bracket (23).   7 Device according to any one of the res-   dications 1 to 6, characterized in that the control shaft (6) and the cocking rod (12 a) of the valve   safety lines extend approximately perpendicular to one to the other.   8 Device according to any one of   Claims 1 to 7, characterized in that the shaft of   control is fitted with an axial stop member (25)   limiting the axial movement of said shaft.