CYLINDRICAL DIAPHRAGM ASSEMBLY WITH REDUCED DIAMETER FOR HIDRAULIC SHOCK ABSORBERS SEALED AT BOTH ENDS, OF THE TYPE EMPLOYED IN SELF-CLOSING FURNITURE

Abstract

Cylindrical diaphragm assembly of reduced diameter for hydraulic shock absorbers with sealing at both ends, of those used in self-closing furniture, which at its outer end performs the sealing of the cylindrical body of the shock absorber and at its inner end performs the sealing of the shock absorber shaft, said cylindrical diaphragm assembly being on its outer side a fluid compensation chamber and on the other inner side an aerial chamber and consisting of an insertable elastic hood whose inner end has an annular decrease in diameter, generating a flat support area and ending in a conical extension of a simple seal in contact with the axis of the shock absorber, and of an inner tubular centering male provided at its inner end with a conical head with a flat outer wall for support and fixing of said insertable elastic hood; and that said inner tubular centering male has longitudinal flaps, said inner tubular centering male ending in a closure plug prominence which, with the outer end of the insertable elastic hood, generates a simple seal with the cylindrical body of the shock absorber.

Claims

1. A cylindrical diaphragm assembly of reduced diameter for hydraulic shock absorbers with sealing at both ends, of those used in self-closing furniture, which at its outer end performs the sealing of the cylindrical body of the shock absorber and at its internal end performs sealing of the shock absorber shaft, said cylindrical diaphragm assembly being a fluid compensation chamber on its outer side and on the other inner side an aerial chamber wherein it is composed of an insertable elastic hood whose inner end has an annular decrease in diameter, generating a flat support area and ending in a conical extension of a simple seal in contact with the axis of the shock absorber, and of an inner tubular centering male provided at its inner end with a conical head with a flat wall for external support and fixing of said insertable elastic hood; and that said inner tubular centering male has longitudinal flaps ending said inner tubular centering male in a closure plug prominence which, with the outer end of the insertable elastic hood, generates a simple seal with the cylindrical body of the shock absorber.

2. The cylindrical diaphragm assembly for reduced sealing diameters at its two ends, according to claim 1, wherein the top of the longitudinal flaps of the centering tubular inner core is rounded.

3. The cylindrical diaphragm assembly for reduced sealing diameters at its two ends, according to claim 1, wherein the longitudinal flaps are peripherally symmetrical in distribution.

4. The cylindrical diaphragm assembly for reduced sealing diameters at its two ends, according to claim 1, wherein at least one atmospheric communication window with the outside exists in the tubular part of the outer end of the centering tubular inner male.

5. (canceled)

6. The cylindrical diaphragm assembly for reduced sealing diameters at its two ends, according to claim 1, wherein the insertable elastic hood, on its inner annular surface, incorporates ribs of circularly symmetrical positioning extended radially to the shock absorber shaft and with its end close to the surface of the shock absorber shaft.

Description

DRAWINGS AND REFERENCES

[0023] To better understand the nature of the invention, the attached drawings represent an industrial embodiment that is merely illustrative and not limiting.

[0024] FIG. 1 shows an exploded view of the cylindrical diaphragm assembly for shock absorbers (1) where the arrow indicates the direction of insertion in the assembly of the insertable elastic hood (2) in the centering tubular inner core (3). With section details of the inner end of both components where you can see its configuration.

[0025] FIGS. 2 and 3 are longitudinal section views of the inner tubular centering male (3) and the insertable elastic hood (2) respectively. Where the arrow also indicates the direction of insertion in the assembly of the cylindrical diaphragm assembly for shock absorbers (1).

[0026] FIG. 4 shows a section view of the cylindrical diaphragm assembly (1) already assembled.

[0027] FIG. 5 shows a scale comparison of the difference in size of the shock absorber (4) of the present invention with the minimum internal diameter of the cylindrical body of the shock absorber (8), compared to a self-absorbing shock absorber of automobiles or large machinery with its minimum diameter inside the cylindrical body of the shock absorber (8).

[0028] FIG. 6a shows a section view of the cylindrical diaphragm assembly (1) mounted on the shock absorber (4) and with the shock absorber shaft (9) extended to the maximum, where the arrows indicate the air outlet of the aerial chamber (14) to the exterior.

[0029] FIG. 6b shows a longitudinal section view of the shock absorber (4) with the shock absorber shaft (9) extended to the maximum.

[0030] FIG. 6c shows a cross-section view A-A indicated in FIG. 6b, in which the configuration of the insertable elastic hood (2) with the maximum volume of air inside the aerial chamber (14) is observed.

[0031] FIG. 7a shows a section view of the cylindrical diaphragm assembly (1) mounted on the shock absorber (4) and with the axis of the shock absorber (9) introduced to the maximum in the 8 shock absorber cylindrical body (8), and wherein the aerial chamber is observed (14) with the smallest volume of air inside, due to the volume of fluid displaced.

[0032] FIG. 7b shows a longitudinal section view of the shock absorber (4) with the shock absorber shaft (9) inserted to the maximum.

[0033] FIG. 7c shows a cross-section view B-B indicated in FIG. 7b, in which the configuration of the insertable elastic hood (2) with the minimum volume of air inside the aerial chamber (14) is observed.

[0034] FIG. 8a shows an elevation view of the inner tubular centering male (3) and FIG. 8b a cross-section view C-C of FIG. 8 where the configuration of the longitudinal flaps (12) is seen.

[0035] FIG. 9a shows a longitudinal section view of the shock absorber (4) with the shock absorber shaft (9) extended to the maximum, in an alternative embodiment, with the insertable elastic hood (2) having positioning ribs (22), in the which the aerial chamber (14) is observed with the largest volume of air inside.

[0036] FIG. 9b shows in profile the section A-A indicated in FIG. 9a, in which the configuration of the insertable elastic hood (2) is observed, for the execution with positioning ribs (22), with the maximum volume of air in the interior of the aerial chamber (14).

[0037] FIG. 10a shows a longitudinal section view of the shock absorber (4) with the shock absorber shaft (9) maximally inserted into the cylindrical body of the shock absorber (8), which has positioning ribs (22), in which the aerial chamber (14) is observed with the smallest volume of air inside, due to the volume of fluid displaced.

[0038] FIG. 10b shows in profile the section B-B indicated in FIG. 10a, in which the configuration of the insertable elastic hood (2) is observed, for the execution with positioning ribs (22), with the minimum volume of air in the interior of the aerial chamber (14).

[0039] In these figures, the following references are indicated: [0040] 1.Cylindrical diaphragm assembly for reduced diameters [0041] 2.Insertable elastic hood [0042] 3.Tubular centering center male [0043] 4.Shock absorber [0044] 5.Internal end of the insertable elastic hood (2) [0045] 6.Flat support area of the insertable elastic hood (2) [0046] 7.Truncated conical extension of a simple elastic insertable hood seal (2) [0047] 8.Cylindrical body of the shock absorber (4) [0048] 9.Shaft of the shock absorber [0049] 10.Trunk conical head [0050] 11.Flat outer support wall [0051] 12.Longitudinal flaps [0052] 13.Fluid compensation chamber [0053] 14.Aerial chamber [0054] 15.Prominence of closure cap [0055] 16.External end of the insertable elastic hood (2) [0056] 17.Top of the longitudinal flap (12) [0057] 18.Window of atmospheric communication with the outside [0058] 19.Longitudinal striations of evacuation [0059] 20.Exterior annular surface of the insertable elastic hood (2) [0060] 21.Interior annular surface of the insertable elastic hood (2) [0061] 22.Positioning ribs [0062] 22a.Positioning nerve end (22)

EXHIBITION OF A PREFERRED EMBODIMENT

[0063] In relation to the drawings and references listed above, a preferred mode of execution of the object of the invention, referring to a cylindrical diaphragm assembly of reduced diameter for hydraulic shock absorbers with sealing at its two ends, of those used in self-closing furniture, which at its outer end performs the sealing of the cylindrical body of the shock absorber (8) and in its inner end performs the sealing of the shock absorber shaft (9), said cylindrical diaphragm assembly (1) being on its outer side a fluid compensation chamber (13) and on the other inner side an aerial chamber (14) characterised in that it has of an insertable elastic hood (2) whose inner end (5) has an annular decrease in diameter, generating a flat support area (6) and ending in a conical extension of a simple seal (7) in contact with the axis of the shock absorber (9), and acting in conjunction with an inner tubular centering male (3) provided at its inner end with a conical head (10) with a flat wall outer support and fixing (11) of said insertable elastic hood (2); and that said inner tubular centering male (3) has longitudinal flaps (12) ending said inner tubular centering male (3) in a closure cap prominence (15) which, with the outer end (16) of the insertable elastic hood (2), generates a simple seal with the cylindrical body of the shock absorber (8).

[0064] Thus, as can be seen in FIG. 1 and in FIGS. 2 and 3, during assembly the insertable elastic hood (2) is inserted into the centering tubular inner core (3), said cylindrical diaphragm assembly (1) being fixed in a simple manner and without the need for additional elements to achieve the compensation of the fluid displaced by the axis of the shock absorber (9), nor the need for additional elements to achieve the tightness between both chambers (13 and 14).

[0065] Once the diaphragm assembly is assembled (FIG. 4), it is inserted into the cylinder body of the shock absorber (4) with the axis of the shock absorber (9) inside the cylindrical diaphragm assembly (1). Thus, said insertable elastic hood (2) that has an annular decrease in diameter, ends in a conical extension of a simple seal (7), which allows manufacturing for reduced diameters that with other existing configurations would not be possible due to the difficulty in manufacturing and assembly due to the use of inward folds or double lip configurations. In this manner, a simple seal of the diaphragm assembly (1) is achieved with the axis of the shock absorber (9) preventing the entry of fluid into the aerial chamber (14) without the use of additional seals.

[0066] In the damping process, in its initial state of rest, before the introduction of the shock absorber shaft (9) the cylindrical diaphragm assembly (1) would be as shown in FIGS. 6a, 6b and 6c. Then, with the introduction of the shock absorber shaft (9) into the cylindrical body of the shock absorber for the actuation of the piston, compensation of the fluid displaced by said shock absorber shaft (9) is necessary. Thus, thanks to the cylindrical diaphragm assembly (1) this volume is compensated by the aerial chamber (14), said cylindrical diaphragm assembly (1) being in its active form as can be seen in FIGS. 7a, 7b and 7c. In these figures, we can see that at the inner end of the diaphragm assembly corresponding to the area deeper into the cylindrical body of the shock absorber (4), specifically at the inner end (5) of the insertable elastic hood (2), thanks to the configuration of flat wall of outer support and fixation (11) of the inner tubular centering male (3), its position is fixed with the flat support area (6) of said insertable elastic hood (2). In this manner, one can avoid said insertable elastic hood (2) moving and causing poor compensation during compression, resulting in ineffective damping.

[0067] Thus, thanks to the inner tubular centering male (3) the insertable elastic hood (2) is fixed and centered within the cylindrical body of the shock absorber (4) and as can be seen in FIG. 7c, said insertable elastic hood (2) adapts to the shape of the centering tubular inner core (3) which, together with the longitudinal flaps (12), results in a uniform deformation of the insertable elastic hood (2), achieving a controlled compensation and without generating critical fatigue zones. Furthermore, said longitudinal flaps (12) provide greater resistance to the cylindrical diaphragm assembly (1) and consequently providing greater durability and reliability.

[0068] Additionally, to achieve a softer deformation if possible and avoiding critical edges that can cause the diaphragm to break, as can be seen in FIGS. 6c and 7c, the top (17) of the longitudinal flaps (12) is rounded.

[0069] And in order for the deformation of the insertable elastic hood (2) to be uniform, it is expected that the distribution of the longitudinal flaps (12) of the centering tubular inner core (3) be peripherally symmetrical.

[0070] As can be seen in FIG. 1, another characteristic of the cylindrical diaphragm assembly (1) is that there are windows (18) in the tubular part of the outer end (closest to the closure plug) that allow the air contained in the inside of the aerial chamber (14) to be evacuated through said windows of atmospheric communication with the outside (18) (FIG. 6a), so that despite the decrease in volume of said aerial chamber (14), the pressure on the inner annular surface (21) of the insertable elastic hood (2) does not increase, avoiding antagonistic efforts acting against the insertion maneuver of the shock absorber shaft (9) into the shock absorber's cylindrical body (8).

[0071] In FIG. 9b, the longitudinal evacuation striations (19) can also be observed, in the contour of the outer annular surface (20), which facilitate the assembly of the shock absorber (4), evacuating the air existing in the cylindrical body of the shock absorber (8) and avoiding the creation of air pockets in the fluid housing area.

[0072] In an alternative embodiment, as can be seen in FIGS. 9b and 10b, which show the cross sections A-A and B-B indicated in FIGS. 9a and 10a respectively, the positioning ribs (22) emerging from the internal annular surface (21) of the insertable elastic hood (2) can be observed. These positioning ribs (22) guarantee the correct functioning of the aerial chamber (2), balancing the amount of fluid admitted between its outer annular surface (20) and the inner surface of the cylindrical body of the shock absorber (8), and avoiding displacements of the internal end (5) of the insertable elastic hood (2) during operation of the shock absorber (4).

[0073] Variations in materials, shape, size and arrangement of the component elements do not alter the essence of the invention, these being described in a non-limiting manner and being sufficient to proceed to their reproduction by an expert.