EP3321432B1 - Drainage fitting - Google Patents

Description

TECHNICAL AREA

The present invention relates to a drain fitting according to the preamble of claim 1.

STATE OF THE ART

Drain sets with the features according to the preamble of claim 1 are for example from the documents EP0522218A1 , FR2576620A1 and FR2658219A1 known. Furthermore, drain fittings for triggering flushes from a cistern are known from the prior art. In particular, drain fittings for the optional triggering of a full flush or partial flush have become known.

For example, the EP 0 722 020 such a flushing device. A weight body is arranged for partial flushing, which can optionally be connected to the valve body.

From the DE 10 2007 001 718 Another drain fitting has become known which has an extension section adjoining the float chamber. This drain fitting is disadvantageous because due to the hydrostatic and hydrodynamic conditions, the valve body reaches a high speed when moving from the flushing position to the closed position, which leads to very loud noises when the closing body hits the valve seat.

DISCLOSURE OF THE INVENTION

Based on this prior art, it is an object of the invention to specify a drain fitting which overcomes the disadvantages of the prior art. In particular, it is a preferred object to specify a drain fitting which closes with less noise.

This object is achieved by the subject matter of claim 1. Accordingly, a drain fitting for a cistern comprises a valve body with a sealing element cooperating with a valve seat and a float, the valve body with the sealing element moving from the valve seat along a central axis from a rest position to a flushing position and from the flushing position is movable into the rest position, and a float chamber with an opening through which the valve body extends and is movably mounted therein, the float being movable within the float chamber along the central axis and hydraulically cooperating with the float chamber. The float chamber comprises at least one control passage through which, as soon as a flushing water level surrounding the drain fitting has sunk to the level of the control passage, air from areas outside the float chamber can enter the float chamber, so that the pressure conditions between the float chamber and the areas outside the float chamber can be equalized The float can be moved from the flushing position to the rest position when the pressure conditions are equalized. The float chamber, apart from the at least one control passage, is designed to be completely closed laterally with a side wall up to an end wall. The float chamber has a base section extending completely around the central axis and a snorkel section adjoining the base section. The cross section of the snorkel section seen transversely to the central axis is smaller than the cross section of the base section. The float has a lower portion from which a column section extends, the float extending with the column section into the snorkel section. The lower section extends and moves substantially into the base section.

Extending the swimmer into the snorkel section has the advantage that, with the increased volume of the swimmer, the proportion of water that presses on the swimmer in the swimmer chamber can be reduced, so that the noise generated during the closing process can be reduced.

Furthermore, by arranging the snorkel section with a smaller cross section than the base section, the volume of the float chamber can be increased without the structural size of the drain fitting or its function being adversely affected. This has the advantage that, due to the increased volume, a simplified optimization of the Closing process is enabled.

As mentioned, the float has a lower section below the column section, the lower section being essentially cylindrical, in particular circular cylindrical, and preferably filling or essentially filling the base section of the float chamber in the flushing position.

The column section is preferably designed as a float. The column section, as well as the lower section, is particularly preferably designed essentially as a cavity filled with air.

The expression “extending into” means that the column section extends into the snorkel section both in the flushing position and in the rest position.

The expression “snorkel section” is understood to mean a section which supplements the base section towards the top in the installed position.

Preferably, the snorkel section of the float chamber extends essentially concentrically to the base section. The snorkel section and the base section are preferably concentrically one above the other. The extent of the snorkel section seen transversely to the central axis is preferably smaller than the extent of the base section.

In the present context, “concentric” is understood to mean that the snorkel section and the base section extend around a common central axis. The two sections are designed to run around the central axis.

Preferably, the column section of the float extends substantially concentrically to the lower section. The column section and the lower section are preferably concentrically one above the other. The extension of the column section, seen transversely to the central axis, is preferably smaller than the extension of the lower section.

In the present context, “concentric” is understood to mean that the column section and the lower section extend around a common central axis. The two sections are designed to run around the central axis.

The external shape of the float with the lower section and the column section and the internal shape of the float chamber with the base section and the snorkel section are such that the float can be moved in the float chamber. The two shapes are essentially designed to match one another, possibly with play to one another.

Viewed in the direction of the central axis, the snorkel section lies within the maximum diameter of the base section. The diameter of the snorkel section is therefore smaller than that of the base section. The same can be said for the diameter ratio between the lower portion and the columnar portion.

The snorkel section and the base section preferably extend completely around the central axis and preferably each have substantially constant diameters. The snorkel section and the base section are therefore essentially designed as cylinders, in particular with a circular base area. The diameter of the snorkel section is smaller than that of the base section.

Preferably, the column section and the lower section extend completely around the central axis and preferably each have substantially constant diameters. The column section and the lower section are therefore essentially designed as cylinders, in particular with a circular base area. The diameter of the column section is smaller than that of the lower section.

The transition between the snorkel section and the base section is preferably conical. The reduction in diameter from the base section to the snorkel section is achieved via this transition.

The height of the base section, viewed in the direction of the central axis, is preferably substantially smaller than the height of the snorkel section, the height of the base section preferably being between 5% and 20% of the height of the entire float chamber. In this way, a compact design of the drain fitting can be achieved.

The height of the lower section, viewed in the direction of the central axis, is preferably substantially smaller than the height of the column section, the height of the lower section preferably being between 5% and 20% of the height of the entire float. The height of the entire float is made up of the height of the lower section and the height of the column section.

The float chamber, that is to say the snorkel section and the base section, apart from the at least one control passage, is designed to be completely closed laterally with a side wall up to an end wall. The float chamber is open at the bottom. The bearing opening, in which the valve body is movably supported, is preferably present in the end wall.

A water reservoir is preferably provided above the float chamber, which opens into the float chamber with a passage, whereby water that is in the water reservoir can flow into the float chamber through the passage. The water reservoir is filled when the cistern is filled and is designed in such a way that it can only be emptied via the passage when the cistern is emptied. The water reservoir can also be referred to as a reservoir.

Preferably, the lower section of the float in the flushing position lies essentially completely in the float chamber. This means that the lower section is essentially completely moved into the float chamber when the flush is triggered. Particularly preferably, the sealing element of the valve body lies essentially completely in the float chamber in the flushing position. This will make that Sealing element protected from the water flowing by.

The column section preferably fills the cross section of the snorkel section essentially completely or at least 55%, in particular at least 75%, when viewed in cross section transversely to the central axis. This means that the column section extends essentially completely or almost completely over a large part of the cross section of the snorkel section when viewed transversely to the central axis.

The column section preferably fills the volume of the snorkel section essentially completely or to at least 55% or at least 90% when the swimmer is in the flushing position. In this context, “essentially completely” means that the column section and snorkel section are relative to one another in such a way that a residual amount of water is always present between the column section and snorkel section. The aforementioned designs have the advantage that the proportion of water which presses on the float when the float moves from the flushing position to the rest position can be kept small.

Particularly preferably, there is play between the outer sides of the column section and the inner sides of the snorkel section.

The control passage is preferably designed to trigger a first flush with a first flush quantity. The drain fitting also includes a control unit for controlling a second flush volume. When a water level intended for the second flush volume is reached, the control unit provides a closing force on the valve body with a closing weight, the closing force being switchable to the valve body via a switching element from the control unit.

When the control unit is raised, the switching element preferably automatically engages in a latching connection with the valve body.

Preferably, the height of the closing weight is adjustable over an adjustment range. This means that the closing weight can be moved over the setting range. At a higher position, less water is used during the rinsing process removed than in a lower position.

Preferably, the first flush is a full flush and the second flush is a partial flush. This means that when the closing weight is activated, a partial flush is triggered and when the control passage through the water level is reached, a full flush is triggered.

Alternatively, the first flush is a partial flush and the second flush is a full flush. This means that when the closing weight is activated, a full flush is triggered and when the control passage through the water level is reached, a partial flush is triggered.

A plurality of control passages are preferably arranged at different heights, the drain fitting further comprising at least one closure element with which one of the control passages can be released and the other of the control passages can be closed.

The closure element is preferably a slide which is movably mounted on the outside of the drain fitting.

At least one of the control passages is preferably arranged in the snorkel section, the other of the control passages, if any, being arranged in the snorkel section and / or in the base section.

The height of the adjustment range of the closing weight preferably extends at least to below the uppermost control passage. In this way, the heights between the control unit and the control passage can be superimposed, which increases the flexibility of setting the water extraction.

The control unit is preferably arranged outside the snorkel section and can move up and down next to the snorkel section.

The snorkel section preferably comprises an opening for venting when it is filled the float chamber.

Further embodiments are given in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1a/1b

eine perspektivische Ansicht einer Ausführungsform einer erfindungsgemässen Ablaufgarnitur;

Fig. 2

eine Schnittdarstellung durch die Ablaufgarnitur nach Figur 1 in Ruhelage;

Fig. 3

eine weitere Schnittdarstellung durch die Ablaufgarnitur nach Figur 1 in Spüllage;

Fig. 4

eine schematische Darstellung der erfindungsgemässen Ablaufgarnitur in Ruhelage;

Fig. 5

eine schematische Darstellung der erfindungsgemässen Ablaufgarnitur bei einer Vollmengenspülung; und

Fig. 6

eine schematische Darstellung der erfindungsgemässen Ablaufgarnitur bei einer Teilmengenspülung.

Preferred embodiments of the invention are described below with reference to the drawings, which are only used for explanation and are not to be interpreted as restrictive. In the drawings show:

Fig. 1a / 1b

a perspective view of an embodiment of a drain fitting according to the invention;

Fig. 2

a sectional view through the waste set according to Figure 1 in rest position;

Fig. 3

another sectional view through the drain fitting Figure 1 in rinsing layer;

Fig. 4

a schematic representation of the inventive drain fitting in the rest position;

Fig. 5

a schematic representation of the drain fitting according to the invention during a full flush; and

Fig. 6

a schematic representation of the drain fitting according to the invention with a partial flush.

DESCRIPTION OF PREFERRED EMBODIMENTS

In the figures, a drain fitting 1 for a cistern is shown. The drain fitting 1 comprises a valve body 2 with a sealing element 4, which works together with a valve seat, and a float 5. The valve body 2 with the sealing element 4 is from the valve seat 3 along a central axis M from a rest position to a flushing position and from the flushing position to the Movable rest position. In the flushing layer, water can flow off through the gap between the valve seat 3 and the sealing element 4.

The drain fitting 1 further comprises a float chamber 6. The float chamber 6 has an opening 28 through which the valve body 2 extends. Of the Valve body 2 is movably supported in opening 28. The float 5 can be moved essentially within the float chamber 6 along the central axis M and works hydraulically with the float chamber 6.

The float chamber 6, apart from the at least one control passage 7, is designed to be completely closed laterally up to an end wall 19 with a side wall 34. The control passages 7 penetrate the side wall 34. The side wall 34 delimits the base section 9 and the snorkel section 10 to the outside. The opening 28 is located in the end wall 19. The float chamber 6 is open at the bottom.

The float chamber 6 comprises at least one control passage 7 through which, as soon as a flushing water level S surrounding the drain fitting 1 has dropped to the level of the control passage 7, air from areas 8 outside the float chamber 6 can enter the float chamber 6 in such a way that the pressure conditions between Float chamber 6 and areas 8 outside the float chamber 6 can be compensated. With this compensation, the float 5 or the valve body 2 can be moved from the flushing position into the rest position.

The float 5 extends with a column section 11 into the snorkel section 10. As a result, the volumes relevant for the lift and the lowering are optimally used and the movement of the valve body 2 can be optimized. Below the column section 11, the float has a lower section 29 which can be moved up and down in the base section 9.

The inner shape of the float chamber 6 is based on Figures 2 and 3 explained in more detail. The float chamber 6 comprises a cylindrical, in particular circular-cylindrical, base section 9 extending completely around the center axis M and a snorkel section 10 adjoining the base section 9. The snorkel section 10 adjoins the base section 9. In the installed position, the base section 9 lies below the snorkel section 10 and the snorkel section 10 above the base section 9. It can also be said that the snorkel section 10 moves the float chamber 6 upwards from the base section 9 extended. The snorkel section 10 is delimited at the top by the end wall 19.

The cross section of the snorkel section 10, seen transversely to the central axis M, is smaller than the cross section of the base section 9. The volume of the snorkel section 10 is preferably greater than that of the base section 9.

The snorkel section 10 extends essentially concentrically to the base section 9. That is, the two cylinders or circular cylinders extend around the common central axis M. The snorkel section 10 has a constant diameter over its entire height H10. In the same way, the base section 9 also has the same diameter over its entire height H9. In this context, the diameter is the inside diameter. The inside diameter of the base section 9 is larger than the inside diameter of the snorkel section 10.

In the embodiment shown, the transition 30 between the base section 9 and the snorkel section 10 is conical. This means that in the area of the transition 30 the diameter of the float chamber decreases from the larger diameter of the base section 9 to the smaller diameter of the snorkel section 10.

The outer shape of the float 5 is based on the Figures 2 and 3 explained in more detail. The external shape of the float 5 is designed to match or essentially similar to the internal shape of the float chamber 6. This means that the inner shape is the same or similar to the outer shape. As mentioned herein, it is advantageous if there is play between the inner shape and the outer shape.

The lower section 29 of the float 5 has a cylindrical, in particular circular cylindrical, external shape. The column section 11 of the float 5 has a cylindrical, in particular circular cylindrical, external shape. The outer diameter of the cylindrical outer shape in the area of the column section 11 and in the area of the lower section 29 is preferably constant.

An overflow pipe 33 extends centrally through the float 5. That is, the The column section 11 and also the lower section 29 have the cross section of a cylinder ring on the inside.

The transition from the lower section 29 to the column section 11 is designed here as a jump in diameter.

The column section 11 extends essentially concentrically to the lower section 29. That is, the two cylinders or circular cylinders extend around the common central axis M. The column section 11 and the lower section 29 have a constant diameter, the diameter of the column section 11 being smaller is than the diameter of the lower section 29. The diameter in this context is the outer diameter.

The outside diameter of the lower section 29 preferably corresponds essentially to the outside diameter of the sealing element 4.

Both the lower section 29 and the column section 11 are each designed as a cavity in the embodiments shown, so that they are buoyant in the water. The cavity provided by the two sections can be filled with air. In the embodiments shown, the cavity is open at the bottom. It can also be designed as a closed cavity.

From the sectional views of Figures 2 and 3 it is shown that the column section 11, viewed in cross section transverse to the central axis M, essentially fills the cross section of the snorkel section 10. The degree of filling is preferably at least 70% when the column section 11 is in the flushing position with the float 5. The column section 11 can also fill the snorkel section 10 to at least 80% or essentially completely.

Based on Figures 4 to 6 Individual partial features of the drain fitting 1 according to the invention are now explained in more detail.

In the Figure 4 the float 5 is in the rest position. The sealing element 4 lies on the valve seat 3. When a first flush is triggered, the float 5 is raised via an actuating section 22. Due to the interaction between the float 5 and the float chamber 6, the float 5 remains in its flushing position. The float 5 remains in its flushing position until the flushing water level S reaches that in the Figure 5 drawn level is lowered. When this level is reached, air can enter the float chamber 6 through the control passage 7 and the hydraulic equilibrium between float 5 and float chamber 6 is disturbed, whereby the float 5 lowers in the direction of the valve seat 3 from the flushing position to the rest position.

In the Figure 6 a second flush is shown. Here the float 5 is raised with an actuating section 23, which is part of a control unit 12 here. Thereby, there is an engagement between the switching element 14 and the closing weight 13. The closing weight 13 here has the shape of a cup filled with water. As soon as the rinse water level reaches that in the Figure 6 drawn level has lowered it, the weight of the water in the closing weight 13 becomes effective and a force is applied to the float 5 via the switching element 14. Because of this force, the float 5 is then moved from its flushing position in the direction of the valve seat 3 into its rest position.

As shown in the figures, the column section 11 is designed such that when the valve body 2 is in the flushing position, its upper end 26 is spaced apart from the end wall 19 of the snorkel section 10. Because of this distance, there is then a certain amount of residual water in the float chamber 6. However, the distance must not be too great, otherwise the closing noises increase.

There is preferably a certain amount of play between the outer sides 20 of the column section 11 and the inner sides 21 of the snorkel section 10. On the one hand, this play is advantageous in the relative movement between column section 11 and snorkel section 10. On the other hand, it is ensured that there is always a certain amount of residual water in this area.

The formation of the snorkel section 10 and the column section 11 with the compared to the base section 9 or the lower section 29 has the advantage that parts of the control unit 12, in particular the closing weight 13, can extend downwards next to the snorkel section 10. This means that parts of the control unit 12 can move up and down next to the snorkel section 10.

The snorkel section 10 has a height H10 as seen in the direction of the central axis M. The height H10 is greater than the height H9 of the base section 9. As a result, the movement path of the control unit 12 can be increased further. The height H9 of the base section 9 is significantly smaller than the height H10 of the snorkel section. The height H9 of the base section 9 is preferably between 5% and 20% of the height of the entire float chamber 5.

Similar height ratios are provided on the float 5 between the height H29 of the lower section 29 and the height H11 of the column section 11.

As explained above, the control passage 7 is designed to trigger a first flush with a first flush quantity. The control unit 12 is designed to control a second flush volume. The first flush amount is preferably a full flush amount and the second flush amount is preferably a partial flush amount.

In the embodiment shown, several control passages 7 are arranged. The control passages 7 are at different heights. A first control passage 7 lies in the area of the upper end of the snorkel section 10. Further control passages 7 are arranged in the snorkel section 10. That is to say, in the embodiment shown, the height of the control passages 7 is distributed over the snorkel section 10. However, it is also possible for additional control passages to be arranged in the base section 9. The height of the control passages 7 would then be distributed over the base section 9 and the snorkel section 10.

The drain fitting 1 further comprises at least one closure element 16 with which one of the control passages 7 can be released and the other of the control passages 7 can be closed. This means that an installer can use the closure element to define which of the control passages 7 is to be the active control passage. The other control passages 7 are then correspondingly closed.

At least one of the control passages 7 is therefore arranged in the snorkel section 10. The other control passages 7 are arranged either in the snorkel section 10 or in the base section 9.

The closing weight 13 can be adjusted via an adjustment range 15. That is, the closing weight 13 can be adjusted in height. This allows the corresponding amount of flushing water to be defined. The height of the adjustment area 15 preferably extends at least as far as below the uppermost control passage 7. This allows the amounts of flushing water to be superimposed.

In the embodiment shown, the control unit 12 furthermore comprises a bearing rod 24, the closing weight 13 being mounted on the bearing rod so as to be adjustable relative to the bearing rod 24. The switching element 14 is activated via a correspondingly designed control surface 25, which is arranged here on the housing in the area of the water reservoir 31.

Below the float chamber 6, the drain fitting here comprises a connecting element 26 on which the valve seat 3 is arranged, the connecting element 26 being connectable to a cistern. The connecting element 26 has several openings 27 through which the flushing water can then flow to the valve seat 3.

Above the float chamber 6 there is an optional water reservoir 31, which opens into the float chamber 6 with a passage 32. Through the passage 32, water that is in the water reservoir 31 can flow into the float chamber 6.

REFERENCE LIST

1 Waste set 22nd Operating section 2 Valve body 23 Operating section 3 Valve seat 24 Bearing rod 4th Sealing element 25th Control surface 5 swimmer 26th Connecting element 6 Float chamber 27 Breakthroughs 7th Control pass 28 opening 8th Areas outside the swimmer chamber 29 lower section 30th crossing 9 Base section 31 water-tank 10 Snorkeling section 32 Passage 11 Pillar section 33 Overflow pipe 12th Control unit 34 Side wall 13 Closing weight 14th Switching element M. Central axis 15th Adjustment range S. Flush water level 16 Closure element H Heights 18th top end 19th Front wall 20th Outside 21st inside

Claims (13)

1. Drain fitting (1) for a cistern, comprising
   a valve body (2) having a sealing element (4), which cooperates with a valve seat (3), and a float (5), wherein the valve body (2) is movable with the sealing element (4) off the valve seat (3) along a centre axis (M) from a rest position into a flushing position, and from the flushing position into the rest position, and
   a float chamber (6) having an opening (28) through which the valve body (2) extends, wherein the float (5) is movable within the float chamber (6) along the centre axis (M) and hydraulically cooperates with the float chamber (6),
   wherein the float chamber (6) comprises at least one control passage (7), through which, as soon as a flush water level (S) surrounding the drain fitting (1) has fallen to the height of the control passage (7), air from regions (8) outside the float chamber (6) can pass into the float chamber (6), such that the pressure ratios between the float chamber (6) and the regions (8) outside the float chamber (6) can be equalized, wherein the float (5), upon equalization of the pressure ratios, is movable with the valve body (2) from the flushing position into the rest position,
   wherein the float chamber (6), apart from the at least one control passage (7), is configured such that it is laterally completely closed by a lateral wall up to an end wall (19),
   wherein the float chamber (6) has a base portion (9), extending fully around the centre axis (M), and a snorkel portion (10), adjoining the base portion (9),
   wherein the cross section of the snorkel portion (10), viewed transversely to the centre axis (M), is smaller than the cross section of the base portion (9), and
   wherein the float has a lower portion (29), away from which extends a pillar portion (11), wherein the float (5) extends with the pillar portion (11) into the snorkel portion (10).
2. Drain fitting (1) according to Claim 1, characterized in that the snorkel portion (10) extends substantially concentrically to the base portion (9), and/or in that the pillar portion (11) extends substantially concentrically to the lower portion (29).
3. Drain fitting (1) according to one of the preceding claims, characterized in that the snorkel portion (10) and the base portion (9) extend fully around the centre axis (M) and preferably have substantially respectively constant diameters;
   and/or in that the pillar portion (11) and the lower portion (29) extend fully around the centre axis (M) and preferably have substantially respectively constant diameters.
4. Drain fitting (1) according to one of the preceding claims, characterized in that the transition (30) between snorkel portion (10) and base portion (9) is conically configured.
5. Drain fitting (1) according to one of the preceding claims, characterized
   in that the height (H9) of the base portion (9), viewed in the direction of the centre axis (M), is substantially smaller than the height (H10) of the snorkel portion (10), wherein the height (H9) of the base portion (9) is preferably between 5% and 20% of the height (H) of the entire float chamber (6),
   and/or in that the height (H29) of the lower portion (29), viewed in the direction of the centre axis (M), is substantially smaller than the height (H11) of the pillar portion (11), wherein the height (H29) of the lower portion (29) is preferably between 5% and 20% of the height of the entire float (5).
6. Drain fitting (1) according to one of the preceding claims, characterized in that above the float chamber (6) a water storage tank (31) is present, which with a passage (32) opens out into the float chamber (6), wherein, through the passage (32), water which is in the water storage tank (31) can after-flow into the float chamber (6).
7. Drain fitting (1) according to one of the preceding claims, characterized in that the lower portion (29) of the float (5) lies, in the flushing position, substantially fully in the float chamber (6), and/or in that the sealing element (4) of the valve body lies, in the flushing position, substantially fully in the float chamber (6).
8. Drain fitting (1) according to one of the preceding claims, characterized in that the pillar portion (11), viewed in cross section transversely to the centre axis (M), fills the cross section of the snorkel portion (10) substantially completely or to at least 55%, in particular at least 75%, and/or
   in that the pillar portion (11) fills the volume of the snorkel portion (10) substantially completely, or to at least 55% or to at least 90%, when the float is in flushing position.
9. Drain fitting (1) according to one of the preceding claims, characterized in that the control passage (7) is configured for the triggering of a first flush with a first flush quantity, and in that the drain fitting (1) additionally comprises a control unit (12) for the control of a second flush quantity, wherein the control unit (12), when a water level provided for the second flush quantity is reached, provides with a closing weight (13) a closing force onto the valve body (2), wherein the closing force (F) can be connected or transferred, respectively, from the control unit (12) up to the valve body (2) via a switching member (14).
10. Drain fitting (1) according to Claim 9, characterized in that the switching member (14), when the control unit (12) is raised, enters automatically into a latching connection with the valve body (2), and/or in that the height position of the closing weight (13) is configured such that it is adjustable over a range of adjustment (15).
11. Drain fitting (1) according to one of the preceding claims 9 to 10, characterized in that the first flush is a full flush, and in that the second flush is a partial flush; or in that the first flush is a partial flush, and in that the second flush is a full flush.
12. Drain fitting (1) according to one of the preceding claims, characterized in that a plurality of control passages (7) are arranged at different height positions, wherein the drain fitting (1) additionally comprises at least one closure element (16), with which one of the control passages (7) can be opened up and the others of the control passages (7) can be closed off,
    wherein, preferably, at least one of the control passages (7) is arranged in the snorkel portion (10), and wherein the optional others of the control passages (7) are arranged in the snorkel portion (10) and/or in the base portion (9).
13. Drain fitting (1) according to claim 10 and one of claims 11 or 12, characterized in that the range of adjustment (15) of the closing weight (13) extends, in terms of its height, at least to beneath the uppermost control passage (7).

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