FR2835905A1 - Sink outlet assembly has strainer screw engaged with nut fitted in cavity with seal on outside of outlet pipe - Google Patents

Abstract

The outlet assembly, comprising a strainer (4) on the inside of the sink and fastened by a screw (5) to a nut beneath it, has the nut fitted into a cavity with a seal on the outside of the outlet pipe. The cavity is located in a boss in the pipe wall and has lower cylindrical and upper conical sections, and the seal is in the form of a sleeve shaped to fit the conical section of the cavity. The lower section can be sixsided to receive a hexagonal nut.

Description

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 The present invention relates generally to a drain plug and more specifically a drain plug having a plug body and a grid, such as those used in sinks. In a manner known per se, the drain body is positioned under the wall of the sink while the grid is positioned in the bottom of the sink, said grid acting on the one hand as a member for mounting and holding the drain on the sink and as a filtration unit to prevent large waste from being sent into the drain.

 In such a grid drain, it is necessary to provide means for fixing said grid to the drain body when these two elements are positioned on either side of the bottom wall of the sink. Usually, said means consist of a bolt, the nut of which is integral with the plug body and the screw is positioned through the grid.

 In a manner known per se, a plug body has a substantially funnel shape with a generally conical upper part having an upper end of large diameter intended to be positioned under the wall of the sink, around the discharge port of this, and a cylindrical lower part of small diameter intended to be connected to a discharge pipe. The nut is positioned in the axis of said plug body, substantially at the bottom of the conical upper part, in an axial cylindrical core connected to the peripheral wall of the plug body by radial arms, usually three in number.

 The nut can be of different shapes, it is for example constituted by an internally threaded tube. It can be fixed in the cylindrical core by being positioned in the mold and overmolded during the molding operation of said plug body or by ultrasonic welding.

 In order to secure the rotation of said nut and said cylindrical core, the external face of the threaded tube constituting the nut has fine axial grooves.

 Although implemented for a long time, such bumps have certain drawbacks.

 First of all fixing the nut in the cylindrical core is quite expensive because it requires either a very precise mold in order to ensure that the nut is

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 suitably placed for its overmolding, ie the implementation of an additional manufacturing step for welding, this additional step further requiring sophisticated equipment.

 Furthermore, it is not uncommon for the rotational securing of the nut and the cylindrical core to be destroyed or for the nut to be torn off from said cylindrical core, for example when an excessive force is applied to the nut by through the screw.

 In addition, the nut is in contact with water during the evacuation of the sink and an oxidation of the latter occurs if it is not made of a good quality stainless material. When the nut is rusty, it becomes impossible to unscrew the screw to clean or disassemble the plug.

 Finally, the presence of the radial arms creates obstacles that hinder the evacuation of water and promote the attachment of dirt.

 The invention tends to propose a drain which does not have the above drawbacks.

To this end, the invention relates to a discharge plug comprising a plug body and a grid fixed to the plug body by the use of a screw engaging in a nut secured to said plug body, characterized in that that said nut is held outside said plug body in a through bore of the wall of said plug body, with interposition of a sealing means.

The discharge plug according to the invention is also remarkable in that: - the through bore is formed in a central boss of the wall of the plug body, - the sealing means is a sleeve of shape adapted to the shape of the through bore, - said through bore consists of three portions, an upper portion opening out inside the bung body, an intermediate portion and a lower portion opening out outside the bung body, - the upper portion of the through bore and the upper part of the sealing sleeve are cylindrical and of low height,

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 - the intermediate portion of the through bore and the intermediate part of the sealing sleeve are conical, their diameter increasing as they move away from the upper portion or from the upper part, - the lower portion of the through bore and the skirt lower part of the sealing sleeve are generally cylindrical, - the upper part and the intermediate part of the sealing sleeve are crossed by a cylindrical bore of diameter equal to the external diameter of the screw, - the lower skirt of said sealing sleeve is thin, its internal space is of dimensions such that it allows the insertion of the nut, - the plug body comprises means for stopping the nut rotating in the bore, - said stop means in rotation of the nut in the bore consist of the wall of the lower part of the bore and of the skirt of the sealing sleeve which have a section similar to that of the nut, - the internal wall of the lower part of the bore consists of six faces and the skirt of the sealing sleeve consists of six walls, - the internal wall of the plug body has a first, upper portion, cylindrical of circular section connected to a second, lower portion, shaped so as to form a substantially helical flow channel, - when the plug body has an inlet nozzle, an evacuation channel is formed circumferentially around the wall internal of said plug body between the latter and a concentric external wall, - the upper face of the plug body has two concentric cylindrical walls so as to allow the installation of a seal comprising a lower part introduced between said concentric walls and an upper part of radial dimension greater than the radial dimension of the lower part in order to cover said concentric walls.

 The invention will be better understood from the description which follows given by way of nonlimiting example with reference to the appended drawings in which: - Figure 1 is an exploded view of an evacuation device for a double sink using two bungs according to the invention,

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 - Figure 2 is a top view of the device shown in Figure 1, - Figure 3 is a sectional view along line III-III of Figure 2, - Figures 4 and 5 are views of each of the bodies plug implemented in the device of Figure 1, respectively in section along the lines IV-IV and VV of Figure 2, - Figure 6 is a top view similar to Figure 2 of the plug bodies, - the Figure 7 is a side view of the device.

 The evacuation device for double sink shown in the drawing comprises two bungs 1, 2 according to the invention connected to each other by an adjustable length link constituted by two pipes 12,20 each of which is connected at one of its ends to one said bumps.

 The drain 1 is a drain with vertical outlet pipe 10. The drain 2 is a drain with horizontal outlet pipe 20 further comprising two inlet nozzles 21, 22 intended for example for the connection of the drainage pipes. washing machines or dishes and arranged tangentially on either side of said drain.

 The bungs 1, 2 are grate evacuation bungs, they consist of a bung body 100,200 and a grid 4.

 The upper face of the plug body 100,200 is shaped so as to allow the installation of a seal 3. To this end, each plug body 100,200 has two concentric cylindrical walls 130-131, 230-231. The seal 3 comprises a lower part 33 of radial dimension such that it is introduced between said concentric walls 130-131,230-231 and an upper part 32 of radial dimension greater than the radial dimension of the lower part 33 in order to cover said concentric walls 130-131,230-231.

 The grids 4 have, in a manner known per se, the shape of a bowl, the bottom of which is crossed by openings 40. Each grid 4 is secured to a bung body 100,200 by the installation of a screw 5 in a central opening it has, said screw 5 being screwed into a nut 50 secured to the plug body by means which will be described later.

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 According to the invention, the wall of each bung body 100,200 is traversed by a bore 16,26 intended for the installation of the nut 50, with the interposition of a sealing means 6 to avoid any risk of leakage towards the outside of the drain 1, 2.

 In the embodiment shown in the drawing, the through bore 16, 26 is formed in a central boss 15,25 of the wall of the bung body 100,200. The vertical outlet pipe 10 of the drain 1 being off-center. As a variant, it is possible to keep a vertical outlet tube 10 centered and to provide an eccentric position for the boss in which the nut mounting bore is formed, the screw 50 then being introduced into a corresponding opening in the grid 4.

 As shown in Figures 4 and 6, said bore 16,26 consists of three portions, an upper portion 160,260 opening out inside the bung body 100,200, an intermediate portion 161,261 and a lower portion 165,265 opening out outside the body drain 100,200. Here, the inside of the plug body is called the concave part thereof facing the sink and intended to receive the water which escapes from said sink and outside the plug body, the convex part of the latter.

 The upper portion 160,260 is cylindrical and of low height.

 The intermediate portion 161,261 is conical, its diameter increases as it moves away from the upper portion 160,260 to approach the lower portion 165,265.

 The lower portion 165,265 is generally cylindrical.

 The sealing means 6 used in the embodiment shown in the drawing is a sealing sleeve 6, visible in FIGS. 1 and 3, of a shape adapted to the shape of the bore 16, 26.

 Said sealing sleeve 6 comprises an upper part 60 intended to be positioned in the upper portion 160, 260 of the bore, a conical intermediate portion 61 intended to be positioned in the intermediate portion 161, 261 of the bore and a lower skirt 65 intended to be positioned in the lower portion 165,265 of the bore.

 The upper part 60 and the lower skirt 65 are thin, their internal space is of dimensions such that it allows the insertion of the screw 5 and the nut 50 respectively.

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The upper part 60 and the intermediate part 61 are crossed by a cylindrical bore of diameter equal to the external diameter of the screw 5, the intermediate part 61 consequently has an increasing thickness from the upper part 60 towards the lower skirt 65. The thickness of said intermediate part 61 is then of the order of 1 millimeter near the upper part 60 and of the order of 3 millimeters near the skirt 65. The sealing sleeve 6, for example made of rubber, has consequently a certain holding, which allows it to be easily manipulated to push it into the bore 16, 26 without it crashing.

Preferably, the external wall of the nut is such that means for stopping it in rotation can be provided so that it does not rotate in the bore.

These means for stopping in rotation between the nut 50 and the bore 16, 26 are firstly constituted by the wall of the lower part 165, 265 of the bore whose cross section is similar to that of the nut 50. In the example shown in the drawing, the nut 50 is a hexagon nut and the internal wall of the lower part 165, 265 of the bore 16, 26 then consists of six faces 162, 262 giving the 'internal space of said lower part 165, 265 a hexagonal section.

Said means for stopping the rotation between the nut 50 and the bore 16 also include the skirt 65 of the sealing sleeve 6 which is made up of six walls 62.

The dimensions of the various components are such that the sealing sleeve 6 is frictionally mounted in the bore 16, 26, and that, likewise, the nut 50 is frictionally inserted into the internal space of the skirt 65 of so that said sleeve and nut remain in place without requiring additional means of maintenance.

The plug according to the invention is quite easy to manufacture since, after obtaining, by molding, the plug body 100, 200 and the sealing sleeve 6, it suffices to insert the nut 50 into the sealing sleeve 6. then said sealing sleeve 6 in the bore 16, 26 of the plug body, from the outside of the plug body. The nut 50 is then held in said bore 16, 26 without requiring the use of additional means.

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 The assembly thus produced is more reliable, on the one hand because it is not possible to tear off the nut 50 or to release it in rotation, and on the other hand because the nut being at outside the 100,200 plug body, it is never in contact with water and is therefore not subject to corrosion.

 The plug according to the invention also has other very interesting arrangements because they improve its performance with regard to the quality and speed of the evacuation.

 The internal wall of the bung body 100,200 has a first portion, upper, 17,27 cylindrical of circular section connected to a second portion, lower, 170,270, shaped so as to form a substantially helical flow channel which can be compared. to a slide. This arrangement makes it possible to entrain the water in a helical movement favoring its speed of flow towards the outlet pipe 10,20. An orifice 171,271 relates the internal volume of the bung body 100,200 and the outlet pipe 10,20.

 In the embodiment shown in the drawing, the substantially helical channel 170 formed in the bung body 100 of the bung 1 with vertical outlet pipe 10, is extended as far as the upper part of the outlet pipe 10 which allows give it a significant slope allowing a very rapid flow of water. In the bung body 200 of the bung 2 with horizontal outlet tubing 20, the substantially helical channel 270 has a less steep slope because said channel is limited upwards by the inlet nozzle 22 and downwards by the tubing horizontal outlet 20. Even with a slight slope, said substantially helical channel 270 advantageously improves the evacuation performance of the plug 2.

 A radial boss 250 is formed between the central boss 25 and the internal wall of the plug body 200. This boss 250 consists of a flat upper wall 251 disposed near the upper wall of the boss 25 and two generally vertical walls 251,252. It allows on the one hand to separate the flow of water entering the bung body 200 into a first flow flowing directly through the opening 271 towards the outlet pipe 20 and a second flow along the substantially helical channel 270 and d on the other hand to channel said second flow into said opening 271.

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 Similarly, the stream of water entering the plug body 100 is separated into a first stream flowing directly into the orifice 171 and a second stream following the helical channel 170. For this purpose the helical channel 170 ends at its upper end along a vertical radial wall 172 disposed above the outlet pipe 10.

 According to a complementary arrangement, an evacuation channel 28 is formed circumferentially around the internal wall 27, 270 of the bung body 200 between the latter and a concentric external wall 280. This channel 28 is open over approximately half of the circumference of the body bung 200 and closed by radial partitions 282 on the other half. The open part of said channel 28 extends from the inlet nozzle 22 to the outlet pipe 20 and guides the water entering the drain 2 through the inlet nozzle 22.

 Said drainage channel 28 is separated in two by a wall 281 preventing the formation of foam in the soapy water coming from a washing machine.

 The inlet end piece 21 is for its part disposed axially opposite the outlet pipe 20.

Claims (15)

1. Drain plug comprising a plug body 100,200) and a grid (4) fixed to the plug body (100,200) by the use of a screw (5) engaging in a nut (50) integral with said plug body (100,200), characterized in that said nut (50) is held outside said plug body in a bore (16,26) passing through the wall of said plug body (100,200), with interposition of a sealing means (6).  2. Plug according to claim 1, characterized in that the through bore (16,26) is formed in a boss (15,25) of the wall of the plug body (100,200).  3. Drain according to claim 2, characterized in that the sealing means (6) is a sleeve of shape adapted to the shape of the through bore (16, 26).  4. Drain according to any one of the preceding claims, characterized in that said through bore (16,26) consists of three portions, an upper portion (160,260) opening out inside the bung body (100,200), a intermediate portion (161,261) and a lower portion (165,265) opening to the outside of the plug body (100,200).  5. Drain according to claim 4, characterized in that the upper portion (160,260) of the through bore (16,26) and the upper part (60) of the sealing sleeve (6) are cylindrical and of low height.  6. Drain according to claim 5, characterized in that the intermediate portion (161, 261) of the through bore (16,26) and the intermediate portion (61) of the sealing sleeve (6) are conical, their diameter growing away from the upper portion (160,260) or the upper portion (60).  7. Bung according to claim 6, characterized in that the lower portion (165,265) of the through bore (16,26) and the lower skirt (65) of the sealing sleeve (6) are generally cylindrical. <Desc / Clms Page number 10>  8. Drain according to claim 6, characterized in that the upper part (60) and the intermediate part (61) of the sealing sleeve (6) are crossed by a cylindrical bore of diameter equal to the external diameter of the screw (5 ).  9. Drain according to claim, characterized in that the lower skirt (65) of said sealing sleeve (6) is thin, its internal space is of dimensions such that it allows the insertion of the nut (50 ).  10. Plug according to any one of the preceding claims, characterized in that the plug body (100,200) comprises means for stopping the nut (50) rotating in the bore (16,26).  11. Plug according to claim 10, characterized in that said means for stopping the nut (50) rotating in the bore (16, 26) are constituted by the wall of the lower part (165, 265) of the bore (16,26) and the skirt (65) of the sealing sleeve (6) which have a section similar to that of the nut (50).  12. Drain according to claim 11, characterized in that the internal wall of the lower part (165,265) of the bore (16,26) consists of six faces (162, 262) and the skirt (65) of the sleeve d 'seal (6) consists of six walls (62).  13. Plug according to any one of the preceding claims, characterized in that the internal wall of the plug body (100,200) has a first, upper, (17,27) cylindrical portion of circular section connected to a second, lower portion, (170,270), shaped so as to form a substantially helical flow channel.  14. Drain according to any one of the preceding claims, characterized in that when the bung body (200) has an inlet nozzle (22), a discharge channel (28) is formed circumferentially around the internal wall. (27,270) of said plug body (200) between the latter and a concentric external wall (280).  15. Plug according to any one of the preceding claims, characterized in that the upper face of the plug body (100,200) has two concentric cylindrical walls (130,131; 230,231) so as to allow the establishment of a seal sealing (3) comprising a lower part (33) introduced between said concentric walls (130,131; 230,231) and an upper part (32) of <Desc / Clms Page number 11>  radial dimension greater than the radial dimension of the lower part (33) in order to cover said concentric walls (130,131; 230,231).