EP2495447A2 - Locking unit for a pump housing and pump - Google Patents

Abstract

The latching device (16) has an elongated latching hook (19) with a latching projection (20). A latching opening (30) for outwardly bounding snap tab (31) is formed in the housing portion (14), and the latching projection is provided on latching opening. One introduction bar (36) with an insertion bevel (37) for the latching hook is arranged in the underside of latching opening. Two latching tabs (40) are engaged into latching opening and provided with a free tab end projected into the path of latching hook when inserted into the latching opening. An independent claim is included for pump.

Description

Field of application and state of the art

The invention relates to a latching device for a pump housing, to connect two housing parts of the pump housing releasably by means of a latching connection. Furthermore, the invention relates to a corresponding pump.

From the EP 2150165 A2 It is known to produce a pump for dishwashers or washing machines with a plastic housing. A first housing part essentially contains the upper part of the pump chamber. A second housing part essentially contains the impeller with pump chamber bottom and possibly a flanged pump motor. By connecting these two housing parts, the pump housing and thus also the pump is completed as essentially the last assembly step for the pump. In order to quickly get to the functional parts of the pump in a repair case, it is advantageous to be able to solve the housing parts again, and then connect again. Particularly preferred here are just releasable latching connections considered.

Task and solution

The invention has for its object to provide an aforementioned locking device for a pump housing and a pump with such a pump housing, with which problems of the prior art can be avoided and in particular an advantageous to manufacture and be released again locking connection can be created.

This object is achieved by a latching device with the features of claim 1 or 13 and a pump having the features of claim 16. Advantageous or preferred embodiments of the invention are contained in the further claims and are explained below. Some of the features mentioned below are only mentioned for a latching device or only for the pump. However, you should be able to apply for both the latching device and for the pump independently. The wording of the claims is incorporated herein by express reference.

The latching device has on a first housing part at least one elongate protruding latching hook. This latching hook has on its upper side on a latching projection, which may be formed quasi right-angle to the insertion or alternatively even undercut. Furthermore, the latching hook on both its upper side and on its underside insertion bevels, so that it is advantageously tapered forward. On the second housing part a detent opening is provided for the latching hook with a detent opening outwardly delimiting latching tab. At this locking tab of the locking projection of the latching hook is at the produced locking connection. The detent opening is thus a closed or edged opening, wherein it is limited to its underside substantially by the second housing part and to the top of the said locking tab, there are side walls of the detent opening.

In a first basic embodiment of the invention, an insertion web is arranged in the latching opening on its underside opposite the latching tab, which has an insertion bevel for the latching hook, the insertion bevel facing the latching hook to be introduced. Furthermore, at least one securing tab is provided, which engages or integrates from the side, in particular on one of the aforementioned side walls, into the detent opening or runs therein. She stands with a free end of the tab in the way of the latching hook when inserting into the latching opening. When produced latching connection, the securing tab or its free tab end is below the latching hook or the underside thereof.

The insertion web with its insertion bevel serves to catch the inserted snap-in hooks in the area of the catch opening at an early stage and to steer it almost in the direction in which it is then intended to engage the latching tongue. The insertion bevel facilitates the introduction in a manner known per se. Furthermore, to prevent the Einführsteg that upon depression of the latching hook for releasing the locking connection and the locking projection of the locking tab too strong bending takes place, which could damage either the latching hook itself or other parts, in particular a securing tab.

The securing tab serves to prevent by their elastic training on the underside of the latching hook or near this bottom an automatic release of the locking connection, so the locking projection away from the locking tab. In this case, namely, the underside of the latching hook would press against the free end of the tab and counteracts the spring force of the securing tab. So even if a bias of the latching hook so that the locking projection behind the locking tab, would be omitted, this would still be a safeguard against automatic unintentional release of the locking connection.

In a further embodiment of the invention, a clear height between an upper side of the insertion web, in particular at its uppermost point, and the locking tab or its lower surface can be at most 10% to 30% greater than the clear cross section of the latching hook. This means that insertion web and locking tab are to be regarded as rigid parts, that for the latching hook for a simple and safe production of the locking connection, although a certain insertion space is given. At the same time but not too big. These considerations apply especially in the longitudinal direction of the latching hook or in the insertion direction.

Advantageously, the insertion web is arranged centrally in the latching opening on the underside thereof. Just as advantageous, the latching hook is arranged centrally to it. In this case, the insertion web can be relatively narrow, since he only needs to absorb pressure, and the latch hook several times wider.

In an advantageous embodiment of the invention, the latching hook is provided on an elongated latching arm, at its free end. Latch hook and latching arm have the same extension direction. Advantageously, the latching arm is longer than the latching hook, particularly advantageously twice to five times as long. It can be formed by a flat flat cross-section elastic in the direction between the top and bottom of the locking opening, so that the locking movement of the locking projection behind the locking tab and a release of the locking connection is well possible. By contrast, against lateral movements of the locking arm is relatively stiff or stable, so that it is ensured that when inserting the two housing parts of the locking hook is also inserted into the locking opening. By such an elongated locking arm with the latching hook on the one hand, the aforementioned elasticity is ensured. Furthermore, under certain circumstances, a generous overlap of the two housing parts can take place one above the other for, for example, a sealing connection.

In an embodiment of the invention, the latching projection of the latching hook or an undercut can project beyond it over the cross section of the latching arm to the top of the latching opening. A supernatant can here be a few mm for a secure locking connection, for example, 2 mm to 5 mm. From the highest point of the latching projection, the insertion bevel on the upper side of the latching hook extends to an aforementioned tip of the latching hook, advantageously approximately rectilinearly. At the Underside of the latching hook is an insertion be less strong or shorter, since no latching projection is provided here yes.

Advantageously, the securing tab is from the side or a side wall of the latching opening, and that particularly advantageous close to the underside of the latching opening. Their thickness can decrease towards the end, so that an optimal cross section with a uniform and material-appropriate bending line can be achieved for an elastic bending or deformation in the direction from the top of the latching opening to the underside. It is possible, the securing tab aufzubiegen to its free end increasingly towards the locking tab upwards, so that it initially extends approximately parallel to the underside of the latching opening and is then bent increasingly upward. This also improves their desired spring properties. Advantageously, it can rest with produced locking connection with the free end of the tab on the underside of the latching hook or reach to shortly before.

In a further embodiment of the invention, it is possible that the clear width between the underside of the locking tab and the free tab end of the securing tab is smaller than the clear cross section of the latching hook in its greatest thickness on the locking projection. This means that the latching hook when plugged into the locking opening in all cases is pressed with its underside against the free tab ends of the securing tab and this must press down to be inserted so far that he can reach behind the locking tab with the locking projection. This then also means that the latching hook to release the latching connection must press the securing tab or its free tab end down so that the latching projection can be released from the latching tab, which is not possible by itself. This is just the backup function of the securing tab.

Particularly advantageous is provided that both on a left side and on a right side of the latching opening two identical or mirror-symmetrical trained securing tabs are provided. Their free tab ends may have a distance to each other, so that they do not touch or hinder. Above all, they can reach just before the introduction gate and be higher than this. Here, the Einführsteg also has another function, namely because when releasing the locking connection by pressing down the latching hook, the bottom of the latching hook presses the locking tabs down. So that they are not pressed too far down and can possibly be damaged, the latching hook then rests on the insertion web and can be pulled out of the latching opening at the same time.

In a further embodiment of the invention, the securing tab in plan view starting from a base extension on the side wall of the latching opening initially tapered by bevels on both side edges. This also allows their elasticity to be determined in detail. After about half of their length, a securing tab may have a hook-like widening and bulging on the side edge facing the first housing part. On this basis, it can then become narrower again towards the free end of the flap. Towards the end of the tab, an insertion bevel is formed since, as has been explained hereinbefore, it slides along the latching opening during insertion of the latching hook and presses it downwards. Furthermore, just from the area of the bulge from the securing tab can be bent in the direction of the locking tab.

The free tab end of the securing tab is advantageously arranged in the insertion direction of the latching hook in the latching opening slightly behind the insertion web. It can thereby be achieved that the first catching and steering of the latching hook during manufacture of the latching connection is carried out by the insertion web with its insertion bevel. Another steering can then by the securing tab or whose free flap end are taken over and reached. This results in a uniform force when inserting the latching hook.

On the underside of the latching hook can be provided as a cross-sectional dilutions of the latching hook left and right next to the insertion, ie on the sides, elongated recesses or depressions. These recesses may lie over the connecting regions of the securing tabs with a side wall of the latching opening. The advantage of these recesses is that the latching hook when pressing down to release the locking connection, until it rests with its underside on the insertion web, presses only against the elastic free tab ends and not previously presses against the region of the securing tabs, which is not elastic and could be damaged.

In a further embodiment of the invention, both the clear width between the underside of the locking tab and top of the insertion web and the arrangement of securing tabs on side walls of the detent opening are formed so that in the case that the latching hook is pressed against the top of the insertion, these recesses just run above the neck portions of the securing tabs on the side walls of the locking opening.

In an advantageous embodiment of the invention, the latching hook has an approximately constant width. Only at the very front at its end or its tip, it can be slightly tapered for easier insertion into the detent opening. Also, the latching arm bearing the latching hook is advantageously the same width over its length.

In a second basic embodiment of the invention, a latching device, as basically mentioned at the beginning, has an elastic or flexible spring means between the latching hook on the one hand and the latching tab and / or the securing tab on the other hand. This may be rubbery or an elastomer. The spring means is preferably an elastic or flexible coating. This ensures that the latching hook rests only on the spring means on the locking tab and has no direct or rigid contact. Thus, vibrations or other possible noise sources can be damped or not transmitted via the latching device from one housing part to the other and the noise insulation is thus improved.

Advantageously, the latching hook is in the axial direction of the locking tab without direct contact of the otherwise rather solid or non-elastomeric materials of the housing parts, and only via the spring means. This is the main force of the locking connection, which holds the two housing parts, especially in the axial direction. Particularly advantageously, the latching hook is also in the radial direction only via a spring means on the latching tab, possibly via another spring means. Even so, an elastic system of the two parts can be achieved.

The spring means may for example be applied as an elastic or flexible coating on the latching hook, for example by multi-component plastic injection molding. A thickness may be less than 3 mm, advantageously 1 mm or less. This is considered sufficient for noise reduction. The hardness of the elastomeric spring means may be in the range of 50 to 70 Shore A.

In a further development, a projection of non-elastic material may be provided in the spring means, on the one hand, the thickness of the spring means is reduced. On the other hand, this achieves a kind of limit stop in order to achieve a sufficiently defined contact between latching hook and latching tab.

In a further development, such a spring means can also be provided between the securing tab and the latching hook. Advantageous It may be provided on the corresponding side of the latching hook as well as the other spring means, so that only on the latch hook spring means or elastic coatings must be provided or injected.

The latching device described is particularly well suited for being installed in a pump. The pump has a housing of at least two housing parts to be connected. Although more housing parts can be connected to one another with such a latching connection, for example by distributed latching connections. However, exactly two housing parts are advantageously connected or connectable to one another, ie, the pump has a two-part housing with exactly two separate housing parts.

These and other features will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Fig. 1

eine Schrägansicht von außen auf eine Pumpe mit Pumpengehäuse und mehreren Rasteinrichtungen,

Fig. 2

entsprechend Fig. 1 eine Schrägansicht auf einen ersten Gehäuseteil der Pumpe mit vier abstehenden Rasthaken,

Fig. 3

einen Rasthaken entsprechend Fig. 2 im Schnitt von der Seite,

Fig. 4

entsprechend Fig. 1 eine Schrägansicht einer Rastöffnung an einem zweiten Gehäuseteil,

Fig. 5

eine Draufsicht auf einen Einführsteg und Sicherungslaschen in einer Rastöffnung am zweiten Gehäuseteil ähnlich Fig. 4,

Fig. 6

einen Seitenschnitt entsprechend Fig. 3 durch die Rasteinrichtung mit dem Rasthaken des ersten Gehäuseteils in der Rastöffnung des zweiten Gehäuseteils,

Fig. 7

eine Ansicht von vorne auf die Rasteinrichtung der Fig. 6 und

Fig. 8

eine Draufsicht auf einen Ausschnitt der Fig. 6.

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings shows:

Fig. 1

an oblique view from the outside on a pump with pump housing and a plurality of locking devices,

Fig. 2

corresponding Fig. 1 an oblique view of a first housing part of the pump with four protruding latching hooks,

Fig. 3

a latch hook accordingly Fig. 2 on average from the side,

Fig. 4

corresponding Fig. 1 an oblique view of a latching opening on a second housing part,

Fig. 5

a plan view of an insertion and securing tabs in a latching opening on the second housing part similar Fig. 4 .

Fig. 6

a side section accordingly Fig. 3 by the latching device with the latching hook of the first housing part in the latching opening of the second housing part,

Fig. 7

a front view of the latch of the Fig. 6 and

Fig. 8

a top view of a section of the Fig. 6 ,

Detailed description of the embodiments

In Fig. 1 a pump 11 according to the invention is shown with a pump housing 12, which has a first housing part 13 and a second housing part 14. The two housing parts 13 and 14 made of plastic are interconnected by means of a plurality of latching devices 16 in a detachable manner. As in particular together with the FIGS. 2 and 3 can be seen, four locking arms 18 are provided for the locking devices 16 on the first housing part 13 with latching hooks 19 at the ends. The latching arms 18 are partially different lengths, but the latching hooks 19 taken in isolation identical.

A latching hook 19 has on its upper side or towards the outside a latching projection 20 with a slight undercut 21. The height of the latching projection 20 may amount to approximately twice the thickness of the latching arm 18. From the latching projection 20 from an upper insertion bevel 23 extends forward to a tip 25 of the latching hook 19. On the bottom, a lower insertion bevel 24 is provided, which, however, is much shorter. Furthermore, 19 two side recesses 27 are provided as depressions on the underside of the latching hook. Their function will be explained later in more detail. They are how Fig. 2 shows, but only provided on the outer edge. Furthermore, like Fig. 3 shows in side section, the latching hook 19 may be a little bit outwardly compared to the latching arm 18th

Furthermore, it is off Fig. 2 good to see that the latching arms 18 with the latching hooks 19 have a certain elasticity, which in the illustration according to Fig. 3 is given up and down. Against unintentional lateral movement, in the Fig. 3 that is, perpendicular to the plane of the drawing, the relatively large width of the latching arms 18 acts.

In Fig. 4 is shown on the second housing part 14 of the other part of the latching device 16, namely a detent opening 30 with a this upwardly delimiting or covering latching tab 31 in the manner of an overarching, bridge-like web. Towards the first housing part 13, that is, from where the latching hook 19 is attached, is from the latching tab 31 from an insertion projection 32 from which is chamfered on its underside. This is, according to the upper insertion bevel 23 of the latching hook 19, for ease of insertion.

As well as the comparison with the Fig. 5 to 7 shows, the latching opening 30 is relatively large to the first housing part 13, according to Fig. 7 has the same width and changes between two side walls 34 only in the clear or free height. On an underside of the latching opening 30 and the latching tab 31 opposite, an insertion web 36 is arranged in the middle of the latching opening 30. It has in the direction of the first housing part 13 to an insertion bevel 37, which leads to a top 38, so that it has a kind of ramp shape.

Left and right of the Einführsteg 36 is from each side wall 34 a securing tab 40 in the locking opening 30 inside. The securing tabs run, in particular Fig. 5 in plan view, from its neck region on the side wall 34 in a tapered shape and become narrower towards a bulge 42. This bulge 42 then forms a hook-like widening towards the free end of the tab 41. In this case, an insertion bevel 43 is still provided to the free end of the tab 41, which is particularly good from the FIGS. 5 and 6 can be seen.

As especially from the relevant in this regard 6 and 7 can be seen, when attaching the two housing parts 13 and 14 to each other, the latching hook 19 in Fig. 6 introduced from the left into the locking opening 30. This is relatively large, so it is easy to hit. The latching hook 19 on the latching arm 18, the in Fig. 6 almost in its original state accordingly Fig. 2 is shown and thus rests with only a slight elastic pressure on the underside of the latching tab 31 is pressed by sliding along its upper insertion bevel 23 at the lower insertion of the Einführvorsprungs 32 to the underside of the latching opening 30 and guided. If, for example, in a manual assembly with pressing down the latching hook 19, this pressed very far down, then runs its lower insertion bevel 24 at the insertion bevel 37 of the insertion web 36 at. So the catch hook 19 is then pressed up again.

How out Fig. 6 can be seen, the left-facing side edge of the securing tab 40 with the insertion bevel 43 almost the continuation of the insertion bevel 37 of the insertion web 36 and pushes the catch hook 19 a little further up. It comes with the upper end of the locking projection 20 on the underside of the locking tab 31 to the plant. Because he can not push it up, instead, the locking tab 40, which is not shown, but based on the FIGS. 6 and 7 well imaginable, pushed down. As soon as the latching hook 19 has passed the latching tab 31 with its latching projection 20, it is pushed either upwards by its own or the spring force of the latching arm 18 or, above all, also by the spring force of the securing tabs 40. This is how it happens the in Fig. 6 shown latching abutment of the locking projection 20 at the pointing to the right or front edge of the locking tab 31st

If now, for whatever reason, the spring force of the latching arm 18, which presses the latching hooks 19 against the latching tab 31 up, relax or deformation of the latching arm 18 occur, the latching hook 19 may be a small piece towards the bottom the latch opening 30 move. But then he lies, like the 6 and 7 show very quickly with its underside on the free end of the tab 41 of the locking tabs 40 and is held by the spring force. In this case, according to the figures, the distance between the underside of the latching hook 19 and the free tab ends 41 is significantly less than the height of the latching projection 20, for example, almost half as large. This means that the free tab ends 41 and the securing tabs 40 would already have to be pushed down quite a bit, so that the latching projection 20 is released from the latching tab 31 for releasing the latching connection. An automatic release is thus reliably prevented. A locking connection produced in this way is not automatically solvable even by just occurring during operation of pumps vibrations.

The cross section of the securing straps 40 or their course of thickness is specially designed to effect, together with the course bent to the free flap end 41, with good elasticity, a sufficient spring force against such unintentional release of the snap connection. Just the bent shape causes the spring force of the locking tabs 40 is particularly large when pressed down at the beginning.

To release the locking connection of the latching device 16 is pressed onto the top of the latching hook 19 and on the upper insertion bevel 23, for example by hand. This then just has to be done with sufficient force to bend the locking tabs 40 as far down or the free tab ends 41 to press down so far that the latching projection 20 is released from the latching tab 31. However, in this case the securing tabs 40 are not damaged by overpressing, inter alia, the insertion web 36. Then the catch hook 19 is located on its top 38 and can not be pressed down. This can also serve as a noticeable stop, so that an assembly person knows that they can now pull the latching hooks 19 out of the latching opening 30.

Out Fig. 7 It can be seen that the purpose of the recesses 27 on the underside of the latching hook 19 is that the latching hook 19, when pressed down to the insertion web 36, presses only on the free tab ends 41, but not close to the securing tab 40 The transition into the side wall 34. Such a deformation could namely be caught by the elasticity of the securing tabs 40 bad and would lead to permanent damage.

By providing two locking tabs, the advantage is achieved that even when mechanical failure of a securing tab, the other can still perform their function. Due to the special design of the insertion bevels, in particular also the securing tabs 40, a uniformly extending joining force can be achieved over the entire assembly path. Thus, no unwanted and undesirable force peaks occur when mating the two housing parts.

In Fig. 6 Furthermore, it is shown how a flexible coating 45a of elastomeric material is provided on the side facing the latching tab 31 of the latching projection 20. This is also in Fig. 8 in plan view of a partial section of the latching device 16 accordingly Fig. 6 shown. The flexible coating 45a extends over the entire width of the latching hook 29 and the latching projection 20. It takes over the aforementioned axial damping between latching hooks 19 and latching tab 31 and thus between the first housing part 13 and the second housing part 14.

Out Fig. 6 It can be seen that an elastic damping between a possible radial stop of the latching hook 19 is provided on the locking tab 31, namely as a flexible coating 45b. Thus, in the case of a touch here vibrations can be damped or a transmission of vibrations can be reduced.

As can be seen, the flexible coatings 45a and 45b are shown slightly hatched and sprayed with elastomeric material by a multi-component injection molding process on the latch hook 19, which is usually made of hard plastic material and may be a thermoset or thermoplastic. Their thickness can be about 1 mm to 2 mm. Although you can basically both be provided on the locking tab 31 or only one of them. However, a coherent manufacture and attachment to the latching hook 19 is considered to be better and simpler in terms of production technology.

Furthermore, it can be seen how the free tab ends 41 of the securing tab 40 have a flexible coating 46 shown hatched. Here, the flexible coating 46 may be sprayed onto a slightly thinner core of the free tab end 41 with a smaller thickness than the other coatings, for example, only 0.5 mm. As a result, it can be achieved, above all, that not all the free tab end 41 is flexible, but only coated with it. Finally, it should reliably take over the aforementioned backup function. Therefore, it is important that the free tab end 41 is substantially dimensionally stable.

From the top view Fig. 8 can also be seen that on the latching hook 19 and the latching projection 20 in the middle of the flexible coating 45a, a small stop projection 48 is provided. This is advantageously a continuation of the hard material of the latching hook 19 and the latching projection 20. The stopper projection 48 is indeed covered by the flexible coating 45a to the latching tab 31 out. However, the flexible coating 45a is obviously thinner here, for example only 0.5 mm.

The stopper protrusion 48 serves to press the latching projection 20 against the latching tab 31 when an axial force is applied to pull apart the two housing parts 13 and 14, thus compressing the elastomeric material of the flexible coating 45a. So that this is not possible over the entire thickness of the coating 45a, which could mean an unintentionally large loosening of the two housing parts, just the stop projection 48 is provided as a boundary. However, it is then still due to the small-area, thinner coating 45a on the locking tab 31 and even so can cause a certain damping.

Claims (16)

Catching device for a pump housing for producing a releasable latching connection between two housing parts of the pump housing, wherein the latching device comprises on a first housing part an elongated protruding latching hook with a latching projection on the upper side of the latching hook and insertion bevels on the top and the bottom, wherein on a second housing part a Detent opening is provided with a detent opening outwardly delimiting latching tab, abuts the latching projection at the completion of the latching projection, characterized in that in the latching opening on the underside opposite of the latching tab an insertion web is arranged with an insertion bevel for the latching hook and at least one securing tab engages from the side in the latching opening, which protrudes with a free end of the tab in the path of the latching hook when inserting into the latching opening. Locking device according to claim 1, characterized in that the clear height between an upper side of the insertion web and the locking tab is at most 10% to 30% greater than the clear cross section of the latching hook, in particular seen in the longitudinal direction. Locking device according to claim 1 or 2, characterized in that the insertion web is arranged centrally in the latching opening on the underside thereof and is also arranged centrally to the latching hook. Locking device according to one of the preceding claims, characterized in that the latching hook is formed on an elongated latching arm at the free end and latching hook and latching arm have the same direction of extent, preferably the latching arm is twice to ten times as long as the latching hook and by a flat, wide cross-section is elastic in the direction between the top and bottom of the latching opening. Locking device according to one of the preceding claims, characterized in that the latching projection of the latching hook extends over the cross section of the latching arm to the top of the latching opening and extends from its highest point from the insertion bevel to a tip of the latching hook. Locking device according to one of the preceding claims, characterized in that the securing tab from the side of the detent opening, in particular near the bottom of the detent opening, protrudes and reduces its thickness to a free tab end, preferably the securing tab for free tab end increasingly towards the locking tab is bent up and rests at the prepared locking connection with the free end of the tab on the underside of the latching hook or until just before reaching. Locking device according to claim 6, characterized in that the clear width between the underside of the locking tab and the free end of the securing tab is smaller than the clear cross section of the latching hook in its greatest thickness on the locking projection. Locking device according to one of the preceding claims, characterized in that on a left side and a right side of the detent opening two equal or mirror-symmetrical formed locking tabs are provided, the free tab ends have a distance from one another and in particular until shortly before the insertion bar and higher than this end up. Locking device according to one of the preceding claims, characterized in that the securing tab in plan view of a base approach to the side wall of the locking opening initially tapered by bevels on both side edges and then after about half of their length at the side facing the first housing part side edge has hook-like distribution and bulge and then becomes narrower towards the free end of the tab again, in particular to the free end of the tab towards an insertion is formed and from the bulge from the securing tab is bent to the locking tab out. Locking device according to one of the preceding claims, characterized in that the free tab end of the securing tab is arranged in the insertion direction of the latching hook in the latching opening slightly behind the insertion web. Locking device according to one of the preceding claims, characterized in that elongate recesses or depressions are provided as cross-sectional dilutions of the latching hook on the underside of the latching hook left and right next to the insertion and these recesses lie over the connecting portions of the securing tabs with a side wall of the latching opening, preferably the clear width between the underside of the locking tab and the top of the insertion web and the arrangement of securing tabs on a side wall of the detent opening are formed so that when pressed against the top of the insertion web latch hook the recesses or depressions on the underside of the latching hook above the neck portions of the securing tabs extend the side walls of the locking opening or these do not touch there, in particular, the free tab ends of the securing tabs are significantly higher than the top of the insertion web. Locking device according to one of the preceding claims, characterized in that the latching hook has an approximately constant width, in particular also together with the latching arm carrying it. Locking device according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that between one hand the latching hook and on the other hand the locking tab and / or the securing tab an elastic or flexible spring means is arranged, wherein preferably the latching hook on the latching tab without direct Contact and only on the spring means is applied. Locking device according to claim 13, characterized in that the latching hook rests in the axial direction on the latching tab without direct contact and only via the spring means, preferably also in the radial direction. Locking device according to claim 13 or 14, characterized in that the spring means is an elastic or flexible coating, in particular applied to the locking tab, preferably having a thickness of less than 3mm, in particular 1 mm or less, woibei in particular in the spring means a projection made of non-elastic material is provided for reducing the thickness of the spring means. Pump having a pump housing of at least two housing parts, characterized in that at least two housing parts are connected to each other by means of a latching device according to one of the preceding claims.

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