FR2564168A3 - SEALING FOR PNEUMATIC OR HYDRAULIC CIRCUIT COMPONENTS - Google Patents

Abstract

SEALING ASSEMBLY FOR PNEUMATIC OR HYDRAULIC CIRCUIT COMPONENTS EQUIPPED WITH A THREADED ROD 11 AND AN ANNULAR STOPPER SURFACE 12 ESSENTIALLY FLAT, INCLUDING AN ANNULAR ELEMENT 13 WITH A GENERALLY SQUARE SECTION, BUT WITH THE INTERNAL FACE SHAPED A PERIPHERAL OVERLAY 14 NEAR ONE OF THE FLAT SIDES TO CREATE A SUPPORT ON AN O-RING 15 IS AROUND THE THREADED ROD 11 AND INSIDE THE ANNULAR ELEMENT 13, WHICH HAS A TRANSVERSE THICKNESS EQUAL TO THE HEIGHT THAT MUST PRESENT THE GASKET 15 LODGED IN IT ELEMENT 13 WHEN IT IS COMPRESSED TO ENSURE THE SEAL BETWEEN TWO CLOSE SURFACES 12, 17.

Description

Seal for components of tire circuits -

static or hydraulic

  There are various known types of gasket

  sealing intended to be placed between two elements, in particular a threaded body to be screwed into a corresponding seat. One of these toppings, known as

  "O-Ring" due to its toroidal shape, has reached a lar-

  ge diffusion due to its excellent behavior in several different aspects, which is well known

technicians.

  However, to properly use this type of packing on threaded bodies, such as rods,

  plugs, etc ..., it is necessary to carry out by usi-

  mechanical stroke a seat capable of receiving the O-ring

  partially, so that it does not come out of the po-

  correct sition and cannot be expelled by surfaces approaching with rotation and therefore with a reciprocal movement which creates shearing forces

  in the lining, which, due to its circular section

  circular, is driven in the movement. On the other hand,

  this type of packing requires correct tightening of the

  between which it is placed, in order to avoid deformations which are insufficient to guarantee sealing or excessive deformations which can crush or at least damage the material, an elastomer, the

made up the filling.

  The object of the present invention is to provide a

  composite lining for optimum operation

  male excellent sealing characteristics of O-rings, on threaded bodies, without it

  it is necessary that these bodies have a particular form

  1st conch to receive this special garnish.

- 2 -

  According to the invention, the packing assembly comprises

  takes an annular element with a generally square section,

  but with the internal face provided with a peripheral projection

  rique near one of the flat faces to create a support on the O-ring placed inside the annular element, which has a transverse thickness equal to the height which the O-ring housed in this element must present is compressed to ensure

  the seal between two closely spaced surfaces.

  The aims and characteristics of the invention are

  will be better understood thanks to the description of a form

  of realization made below by way of example and in

referring to the attached drawing.

  In this drawing, Figures 1 and 2 show in diametral section a plug provided with a gasket according to the invention, respectively in the free position and in

working position, compressed.

  These figures show a plug 10, of the traditional type, which must be considered as a generic example of a threaded body to be screwed into a seat, with interposition of a fitting: indeed, any other type of fitting has the same shape as regards the existence of a threaded rod 11, turned to

proximity of a bearing face 12.

  According to the invention, an annular element 13 is produced from a relatively rigid material, metallic or not, which has a projection 14 on its internal face. Inside this element is arranged a traditional O-ring 15. It should be noted that the thickness of the ring 13 is smaller than the diameter of the section of the O-ring: this thickness is equal to the corresponding dimension that the O-ring must

  take to ensure a good seal without deformation

  excessive tion. This compressed position of the O-ring -3-

  is shown in Figure 2, where the cap is shown

  felt screwed into a seat 16 of a body 17 drawn

only in part.

  Based on what has been discussed, it is easy to understand the benefits of the packing assembly

proposed above.

  The O-ring maintains the rigid element 13 thanks to the internal peripheral projection 14 of the latter and the assembly of the assembly on a normal threaded rod, as standard, is simple and very fast. When tightening is carried out, the element 13, which peripherally maintains the O-ring by preventing any alteration of its shape and by standardizing its compression, constitutes a deformation limiter limiting the possible approximation of the

  two surfaces between which the packing is placed.

  The user can therefore tighten the element

  threaded until the sudden increase in strength is noted

  tance determined by the thickness of the element 13, without

  be forced to assess with difficulty the weak and pro-

  aggressive increase in resistance due to elastic deformation of the O-ring during screwing; this ensures the correct deformation of the O-ring with

screwing in fully.

  Naturally, the specific shape and dimensions of the elements constituting the lining may vary,

  just as the material they are made of may vary

  persons, provided they respect the functional character

  tional of all that has been described above and, therefore, the framework established by the innovative design

proposed by this invention.

- 4 -

Claims (1)

CLAIM-   Packing set for component   sants of pneumatic or hydraulic circuits provided with a threaded rod (11) and an annular abutment surface (12) essentially planar, comprising an annular element (13) of generally square section, but with the internal face provided with a peripheral projection (14), near one of the planar faces to create a support on an O-ring (15) disposed around the threaded rod (11), and inside the annular element (13), which has a transverse thickness equal to the height that the seal (15) must have in said   element (13) when compressed to ensure watertightness   cheeness between two close surfaces (12,17).