FR2564939A1 - METAL CONNECTION FOR CONNECTING A HOUSEHOLD APPLIANCE TO A GAS SUPPLY - Google Patents

Abstract

METAL FITTING FOR CONNECTING A HOUSEHOLD APPLIANCE TO A GAS SUPPLY, CHARACTERIZED BY THE FACT THAT IT INCLUDES A PIPE 9 AND A TUBULAR CONNECTION ELEMENT 8 CONNECTED UNIT AND GAS TIGHT TO EACH END OF THE said PIPE 9 TO BE CONNECTED A MALE PART OF TUBULAR END 5 JOINED AS A UNIT AUDIT HOUSEHOLD APPLIANCE 2 OR TO THE SAID GAS SUPPLY; EACH OF THESE TUBULAR CONNECTION ELEMENTS 8 DEFINING AN INTERNAL CHAMBER WITH VARIABLE VOLUME 24 AND INCLUDING A TUBULAR BODY 25 IN ELASTICALLY DEFORMABLE MATERIAL HOUSED INSIDE THE SAID CHAMBER 24 AND HAVING AN INSIDE DIAMETER NOT AT THE LESS THAN, AT THE EQUAL TO THE OUTER DIAMETER OF THE RESPECTIVE TUBULAR MALE PART 5.

Description

The present invention relates to a metal fitting

  to connect a household appliance to a gas supply.

  Household appliances, such as kitchen stoves, are generally connected to the gas pipe, or to a cylinder of compressed gas, by means of a reinforced rubber hose, the ends of which are placed by force on respective tubular male parts,

  constituting at one end, the outlet on said channel

  or on the reducer of the gas cylinder and,

  on the other side, the entrance to the household appliance.

  The external surface of each of these tubular male parts is generally provided with annular, serrated ribs which engage in a sealed manner with the internal surface on said pipe, the end of the latter being, in general, clamped on the tubular male part. by means of an external clamp which performs a double function, firstly, to prevent any leakage

  gas and, second, to prevent the hose from detaching

  accidentally expensive of its male part.

  Connection pipes of the type indicated above are shown

  have a number of disadvantages due to the fact that the rubber of which they are made, gradually undergoes a natural aging process, aggravated by contact with the gas, which leads, after a time

  relatively short, hardening of the pipes themselves.

  This hardening is particularly dangerous on the sections of the pipe close to the ends of said tubular male parts. These pipe sections are not only subjected to stresses and contact with the qaz, but they are also the only sections subjected to accidental tension and bending stresses when the household appliance is moved, for example for cleaning, which leads to a stretching of the connection pipe. The object of the present invention is to provide a connector for connecting a household appliance to a gas supply, which has practically none of the above-mentioned drawbacks, that is to say, first of all, being subject to essentially non-aging. natural and once assembled to have no high stress points capable of producing a rupture or a subsequent gas leak. To achieve this object, the present invention therefore relates to a metal connector for connecting a household appliance to a gas supply, characterized in that it comprises a pipe and a tubular connection element

  connected in a unitary and gas tight manner to each end

  mite of said pipe to connect the latter to a male piece of tubular end delivered unitarily to said

  household appliance or said gas supply; cha-

  none of these defined tubular connection elements-

  an interior chamber with variable volume and

  nant a tubular body of elastically deformed material

  table housed inside said chamber and having an internal diameter, in the undeformed state, at least equal

  the outside diameter of the respective tubular male part

  tive. We will now describe a non-limiting arrangement of the present invention, with reference to the accompanying drawing in which: Figure 1 shows a perspective view of a household appliance connected to a gas source via a connector according to the present invention; Figure 2 shows an exploded view and

  axial partial section of the connector of FIG. 1.

  The number 1 in the accompanying drawing indicates a connection connecting a household appliance 2, here a gas stove, to a gas supply 3 consisting here

  by a gas pipe end pipe 4.

  As shown in Figure 1, the free end of the pipe 4 is connected to a tubular axial male part 5 while an identical tubular male part is connected

  at the entrance of the household appliance 2.

  Tubular male parts 5 and 6, which will be called

  thereafter "pipe holder", each have a sppen-

  cylindrical axial dice 7 usually provided with ribs

  annular serrated exterior (not shown).

  Each appendage 7 is axially locked so

  gas-tight, inside a connection element

  respective tubular 8 at each end of fitting 1.

  The tubular elements 8 are connected together by a corrugated metal tube 9 and each of them comprises two bodies 10, 11 substantially in the form of a cup, their faces facing each other. The bodies 10 and 11 have respective cylindrical side walls 12 and 13 having

through axial holes 14 and 15.

  With more details, it can be seen that the wall 12 on the body 10 has a cylindrical interior surface provided with a thread 16 and connected with the hole 14 by a surface 17 in the form of a cane trunk B with conicity directed outwards, while the wall 13 on the body 11 has a cylindrical outer surface provided with a thread 18 which engages in an adjustable manner with a thread 16 and which ends internally

by a frustoconical surface 19.

  At the base of the wall 13, the body 11 is provided with an external annular flange 20 with a hexagonal edge whose external contour is substantially identical to that of a hexagonal surface 21 which externally borders the

wall 12 on the body 10.

  The body 11 also includes a tubular appendage 22 extending from the flange 20, coaxial with the hole 11

  and to the wall 13 and on the opposite side of the latter

  niere. The tubular appendage 22 is connected in a gas-tight manner to a respective end of a pipe 9,

  in the example shown in Figure 2 by welding.

  However, by giving an appropriate shape to the ends of appendix 22 and if possible also to pipe 9, appendix 22 and pipe 9 can be easily

  connected, for example by welding. Pipe 9 is pre-

  ference made of stainless steel sheet and is

  corrugated so as to form a series of annular ribs

  res 23 which can be easily adjusted axially by exerting a traction or compression so as to make

  vary the length of fitting 1 between certain limits.

  When they are connected together, the bodies 10 and 11 define an interior chamber 24 communicating, on one side, externally through a hole 14 and on the other side with the pipe 9 through the hole 15 and the volume of which can be modified by screwing the body 10 more or less

on the body 11.

  Chamber 24 houses a tubular body 25 made of elastically deformable elastomer, a cylindrical wall 26 of which has two outer end surfaces

  frustoconical 27 and 28 similar to and undertakes respec-

  tively with surfaces 17 and 19 and two annular end surfaces 29, 30 and it is crossed by a

  hole 31 coaxial with hole 14 and 15 and having, before deforming

  body 25, a diameter at least equal to the diameter

  be outside the respective appendix 7.

  The connector 1 is connected to pipe holders 5 and 6 extremely quickly by unscrewing the bodies 10 from the bodies 11

  by an amount such as the length of the respective chambers

  tives 24 is at least equal to that of the respective bodies 25,

  thus allowing the hole 31, on each body 25, to receive

  easily see appendix 7 on the hose holders 5

or 6 respectively.

  Having inserted said appendix 7, each body 10 is gradually screwed onto the respective body 11 so as to reduce the volume of the respective chamber 24 and to compress the respective body 25 axially. Since any radial external deformation of the body 25, resulting from said axial compression, is prevented by the fact that the wall 26 comes into contact with the wall 12, the body 25 is deformed inward, which has for

  consequence of reducing the section of hole 31.

  By screwing each body 10 more on the respective body

  tif 11, a single operation, which can be performed by

  anyone using the usual ordinary tools, pro-

  has two effects, namely, that of making the

  surface of hole 11 in a gas-tight manner

  outer face of the respective appendage 7 and that of compressing the body 25 between the respective appendage 7 and the respective wall 12 so as to lock said appendage 7 axially inside the element of

respective tubular connection 8.

  With regard to the bodies 25, which act both as connection and sealing elements, it will be noted that the wall 26 is clamped between the appendage

  respective 7 and the interior surface of the chamber 24.

  Consequently, the bodies 25 come into contact with the gas which circulates in the fitting 1 only on the annular surfaces 29 and 30, the dimension of which

  relatively small is such that it eliminates sensitive-

  lie any danger of seeing the bodies 25 break as a result of the coming into contact of the elastomer of which they

are made with gas.

Claims (4)

  1. Metal fitting for connecting a household appliance to a gas supply, characterized by the fact   that it comprises a pipe (9) and a connecting element   tubular ment (8) connected in a unitary and gas tight manner to each end of said pipe (9) to connect the latter to a male piece of tubular end (5,6) joined unitarily to said household appliance   (2) or to said gas supply; each of the elements   tubular connection elements (8) defining an interior chamber with variable volume (24) and comprising   a tubular body (25) of elastically deformed material   table housed inside said chamber (24) and having an inside diameter, in the undeformed state, at least equal to the outside diameter of the tubular male part respective (5, 6).   2. Connection according to claim 1, characterized in that both the chamber (24) and the tubular body (25) are of cylindrical shape and provided with axial frustoconical ends, said chamber (24) being of axially deformable volume.   3. Connection according to claim 2, characterized in that each tubular connection element (8) comprises two cup-shaped bodies (10, 11) arranged so that their concave sides face each other, so as to define said chamber (24) and connected together in an adjustable manner by means of a screw, so as to be able to adjust the volume of said chamber (24), said cup-shaped bodies (10, 11) having respective internal axial holes (14, 15) coaxial with said tubular bodies (25) and communicating all   two outside and with said pipe. 2564 9   4. Connection according to one of the preceding claims,   characterized in that said pipe (9) is a corrugated metal pipe, which can be adjusted to adjust the   length of connection (1) between certain limits.