DE29508519U1 - Hand operated pump - Google Patents

Description

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Hand lever operated pump

The invention relates to a hand lever operated pump for dispensing liquid or pasty media, with a pump chamber which has an inlet valve and an outlet valve, further a pump piston which interacts with a pump cylinder, with a cover base for a removal opening of a storage vessel, whereby the cover base is penetrated by a suction pipe, a receiving space for a storage vessel neck, and wherein the hand lever engages under the pump cylinder with a lever arm for pump actuation against the action of a return spring.

Such a pump is known from the PCT application WO 92/03132. The disclosure content of this application is fully incorporated into the disclosure of the present application, also for the purpose of incorporating features of these documents into the claims of the present application.

The aim of the present invention is to further develop a pump of this type using simple means, both structurally and in terms of its operating function? In this case, spatial conditions in the area of the discharge opening of the storage vessel should be included as favorably as possible.

This object is achieved by the invention specified in claim 1.

Subsequent claims specify advantageous developments of the invention.

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As a result of such a design, a pump that is structurally and functionally advantageous is realized. The advantage lies essentially in the favorable accommodation of the pump's actuating mechanism, in that the underfloor area of the cover base is also used for this purpose. In concrete terms, this means that the cover base, assigned to the pump cylinder, has a recess aligned with the storage vessel side, that the lever arm is at least partially retracted into the recess when not actuated and that the recess is designed to at least partially radially overlap the receiving space. This results in an increased immersion depth for the actuating arm and thus an increased stroke. If the increased stroke is not to be used, this can be "converted" into a reduced height of the pump. In any case, the design option is open to vary the angle of the hand lever. Finally, the free end of the lever arm that grips under the pump cylinder can be made larger and thus more stable, for example in the sense of a larger accumulation of material. The radial overlap mentioned can go so far that practically the entire neck of the storage vessel is used. It is also proposed that the cover base be designed as the cover of a screw cap. The integral design opened up here further reduces the number of parts. It is also structurally advantageous if the cover base forms a suction pipe guide extending on the storage chamber side. This is also accommodated in the receiving space, is protected and gives the cover base a high level of internal stability despite the fact that the walls can be thinned due to the polydirectionality of the wall sections relative to one another. Due to the suction pipe guide, tilting of the suction pipe is prevented even if the actuation of the

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lever arm of the hand lever is practically impossible. In addition, the invention proposes that the suction pipe guide has a sealing step for interaction with a sealing counter-step of the suction pipe or the suction pipe holder. In order to be independent of the orientation when assembling or assigning the pump in relation to the recess, it is proposed that the pot-like recess is designed to be rotationally symmetrical. Such a rotationally symmetrical design would also be used if the recess were not implemented directly on the screw cap, but on an insert with the corresponding thread inserted into a suitable receptacle in the housing. In a hand-operated pump according to the generic term, on which the return spring is also designed as a spring bellows, it is then proposed that the suction pipe holder has a radial recess for locking with a spring bellows base. This results in a simple and durable fixation of the spring bellows base to the suction pipe. On the other hand, it is advantageous that a bellows cover rests on the underside of the recess as a counter bearing. The bellows cover is thus supported on a stable ring step. Finally, another advantageous feature of the invention is that a radially aligned air compensation channel is formed on the top of the bellows cover, which continues into an axially oriented connection channel in front of the jacket wall of the suction pipe guide. This results in good, even dampened spring behavior. Finally, it is also advantageous that both the bellows base and the bellows cover extend radially inwards beyond the bellows folds of the bellows. This favors a slim design of the pump.

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The subject matter of the invention is explained in more detail below using an exemplary embodiment illustrated in the drawing. It shows:

Fig. 1 the pump according to the invention in vertical section, both in the non-actuated basic position (solid line type) and in the actuated position (dash-dot line type),

Fig. 2 the pump in front view, Fig. 3 the same in top view and

Fig. 4 is an enlargement of the area of the bellows that forms an air escape/equalization channel.

The pump, designated as a whole with 1, can be operated by means of a hand lever 2.

The double-armed hand lever 2 is pivotably mounted on an axle 3. The latter can be shaped in the same way as the hand lever 2 and is located in a bearing holder 4 of the pump housing 5.

The pump housing 5 consists of an upper part 6 and a lower part 7. These are plugged together, preferably locked together. The dividing joint between the upper part 6 and the lower part 7 is positioned in such a way that the upper part 6 closes the bearing holder 4 from above with a web 8 when correctly assembled, so that the axis 3 is held in place for operation.

Regarding the guidance of the medium conveyed from a storage vessel not shown, e.g. a bottle

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an angled line path is implemented. This involves a fixed, vertically oriented pump piston 9, which interacts with a parallel, coaxial and overlapping pump cylinder 10, which receives its vertical actuation stroke from the hand lever 2.

The pump piston 9 is hollowed out centrally and is open to a pump chamber 11 formed by the pump cylinder 10. This vertical section of the angled line path, formed from a longitudinal opening 12 of the pump piston 9 and the pump chamber 11 of the pump cylinder 10 and located partly in the upper part 6 and lower part 7, is designated by I.

The horizontal section of the angled cable path, which connects at the top and leads to a media output opening 13, bears the reference symbol II.

With regard to the dispensing opening 13, it can be a spray nozzle for liquid medium and a strand-forming nozzle for paste-like medium. The first version is shown.

The horizontal section II of the line path can consist of a channel 14 that is initially semi-annular in cross-section and annular in the end region.

The pump chamber 11 has an inlet valve V 1 and an outlet valve V2. The inlet valve is arranged on the bottom 15 of the pump cylinder 10. For this purpose, reference is made in detail to the PCT application WO 95/03132 mentioned above. The same applies with regard to the specific design of the outlet valve

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V2. This is implemented as a type of hose valve, the former as a flap valve.

A suction pipe 16 extends from the underside of the pump chamber base 15. The latter can be molded directly onto the pump cylinder 10 or can be assigned via a plug connection. In the embodiment shown, the latter version is preferred. For this purpose, a suction pipe holder 17 extends integrally from the underside of the base 15. Its pipe cross-section is significantly smaller than the cross-section of the pump cylinder 10, so that a freely protruding, radially projecting annular shoulder 18 remains beneath it. A lever arm 19 of the pivotably mounted hand lever 2 engages this, causing the pump to be actuated. To do this, the pump lever 2 of the pump 1 is moved towards the riser pipe 16, whereupon the pump cylinder 10 moves upwards and the pressure in the pump chamber 11 increases. This results in the inlet valve Vl increasing its closing force, while the outlet valve V2 opens and medium is released.

The hand lever 2 is operated against the force of a return spring. The return spring is a spring bellows 20. The support for this is proportionally the suction pipe holder 17, which is extended downwards accordingly. This passes centrally through a cover base 21 which directly or indirectly closes a removal opening of the storage vessel. This is formed on the lower part 7 of the pump 1. It is passed through by the suction pipe 16 or the suction pipe holder 17 which supports it in an internal plug connection.

On the underside of the cover base 21, the lower part is formed into a covering the mouth area of the storage vessel.

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the cap 22. In this respect, the cover base is implemented as the cover of this cap 22. It is in one piece with the lower part 7.

However, an advantageous embodiment also consists in the cover base 21 being designed as the cover of a screw cap (not shown).

In the drawing, the corresponding screw thread 23 is located on an insert 24. This is clipped into the cap 22, which itself has no thread. The screw thread 23 cooperates with a matching counter-thread on the outer surface of the storage vessel neck 25, which enters the corresponding receiving space A formed by the cap 22 or the insert 24.

The cover base 21 assigned to the pump cylinder 10 below has a recess V aligned on the storage vessel side. The latter can be molded onto the cover base 21 itself; in the embodiment shown, the recess V is physically implemented on the insert. It starts from the ceiling 26 supported on the underside of the cover base 21 of the cap 22. The recess V extends to approximately the middle height of the cap by appropriate wall deformation. This also utilizes the cap space and thus opens up the design possibility of varying the extension angle of the lever arm 19. A particularly effective lever attack can be provided on the ring shoulder 18, for example in the angle range from fourteen to seventeen o'clock. On the other hand, this also makes it possible to reduce the height of the pump with a favorable lever arm length. A third design possibility arises from

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a thickened and thus more stable design of the under-engaging end of the lever arm 19, which is shown in the drawing in the form of an angled portion 27 running in the direction of the longitudinal central axis x-x of the pump unit, which gives the hand lever 2 an essentially Z-shaped course overall with the axis 3 arranged approximately in the middle area 28 of the Z-web. The axis lies in a plane that corresponds essentially to half the height of the pump cylinder 10 in the spring-loaded basic position. In this basic position, the angled portions 27 formed, for example, by the ends of the forks are in contact with a diametrical line D-D that intersects the plane of the longitudinal central axis x-x (see Fig. 3). This means that the initial force introduction is distributed as favorably as possible in terms of force. When the lever arm 19 is pivoted upwards, the transversely rounded, force-introducing sections of the fork tine ends move only slightly in the direction of the periphery of the ring shoulder 18. To allow the corresponding fork tine ends to reach through, both the cover base 21 and the upward section of the corresponding lower part 7 have an opening on the bearing support side, designated overall by 29. This, together with a lower through-reaching edge, forms a limit stop 30 for the hand lever 2, or more precisely the narrow edge of the lever arm 19 facing it.

The upper limit stop is created by the upper edge 31 of the pump cylinder 10 striking a counter surface 32 of the upper part 6 of the pump 1.

The recess V, which is formed at least in partial radial overlap with the receiving space A, forms an upper counter-support for the spring bellows 20 which is under pre-tension, in such a way that a

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The cover 33 formed on the top of the spring bellows 20 rests on the bottom wall 34 of the recess V. The bottom of the recess V thus forms a counter bearing for the spring bellows 20, which is connected at the other end to the movable pump cylinder 10 via the suction pipe holder 17. The connection of a base 35 there is realized by a latch. To form the corresponding latch, the outer surface of the tube of the suction pipe holder 17 has a radial recess 36 for receiving a central hole edge of the base 35. The recess 36 can be realized as a continuous groove.

The bellows cover 33 and the bellows base 35 run parallel to each other and are made radially inwardly to such a length that they clearly protrude beyond the inner fold bends 37' of the bellows folds 37 of the bellows 20. The bellows base 35 is measured radially at about twice the fold height, while the bellows cover is slightly below this measurement. Due to the flexibility and elasticity of the bellows material, there are no difficulties with regard to demolding. The cover 33 and base 35 are two to three times as thick as the fold wall.

The cover base 21 - if it forms the depression V - or the bottom wall 34 of the insert 24 -*this forms here the depression V- is used to form a suction pipe or suction pipe holder guide extending on the supply side, designated 38. This is a pipe socket. This is formed in the same way as the bottom wall 34 of the insert 24, forming the central opening for the medium. The means available in this regard are also used further, in that the suction pipe guide 38 has a

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10

Sealing stage 39 is formed, which also functions as a support. The (39) works together with a sealing counter stage 40 of the intake manifold, or the intake manifold holder 17. Even with a large preload, the return spring, i.e. the spring bellows 20, is not able to pull the intake manifold holder 17 out of its correct operating position. In fact, this even achieves a stop limit that makes it unnecessary for the free end of the hand lever 19, i.e. the hand lever 2 as a whole, to be subjected to constant stress via the ring shoulder 18.

However, synchronous support can also be achieved by using the limit stop described above 30.

In order to be independent of the angle assignment of the pump 1 in relation to the vessel, the cup-shaped recess V is designed to be rotationally symmetrical. Alternatively, the desired alignment can also be achieved by a design as shown in the unpublished patent application P 44 16 239. The disclosure content of this document is fully incorporated into the present application, also for the purpose of incorporating features of these documents into the claims of the present application.

In order to improve the spring capacity of the bellows 20, a device is provided which allows the air to be inhaled and exhaled inside the bellows. The corresponding device consists in a radially aligned air compensation channel 41 being located on the top of the bellows cover 33. This is covered by the flat underside of the base wall 34, forming a channel. As can be seen from the enlargement - Fig. 4 -

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removable, the mentioned air compensation channel 41 continues into an axially oriented connection channel 42, which is located in front of the jacket wall of the suction pipe guide 38 and interacts with it to form a channel. Both ends of the angle channel created in this way are open, namely the connection channel 42 towards the interior of the bellows and the free end of the air compensation channel 41 towards the receiving space A.

A similar arrangement can be made on the front edge of the storage vessel neck 25, which replaces the medium removed by pumps with the atmosphere.

The function is, briefly summarized, as follows:

By pulling on the hand lever 2, the pump cylinder 10 is moved via the lever arm 19 against the pump piston 9, which is itself arranged so as to be axially immovable. The medium dosed in the pump chamber 11 from a previous pumping cycle is discharged via the longitudinal opening 12 and the channel 14 and finally the discharge opening 13. This happens by passing through the outlet valve V2, while the inlet valve V1 seals off the remaining supply in the vessel. The corresponding movement occurs against the force of the spring bellows 20, which, after the hand lever 2 is released, causes the pump device to return to its basic position. The next batch of medium is sucked into the pump chamber 11 via the suction pipe 16, increasing the volume of the pump chamber 11.

All disclosed features are essential to the invention. The disclosure content of the associated/attached prior art is hereby also incorporated into the disclosure of the application.

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The patent application documents (copy of the prior application) are fully included, also for the purpose of incorporating features of these documents into the claims of the present application.

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Claims (9)

I.: 5s". 13 CLAIMS 1. Hand lever operated pump (1) for dispensing liquid or pasty media, with a pump chamber (11) which has an inlet valve (V1) and an outlet valve (V2), further a pump piston (9) which interacts with a pump cylinder (10), with a cover base (21) for a removal opening of a storage vessel, wherein the cover base (21) is penetrated by a suction pipe (16), a receiving space (A) for a storage vessel neck (25), and where the hand lever (2) engages under the pump cylinder (10) with a lever arm (19) for pump actuation against the action of a return spring, characterized in that the cover base (21), associated with the pump cylinder (10), has a recess (V) aligned with the storage vessel side, that the lever arm (19) is at least partially retracted into the recess (V) in the unactuated state and that the recess (V) in at least partial radial overlap with the receiving space (A). 2. Hand lever operated pump according to claim 1 or in particular according thereto, characterized in that the cover base (21) is designed as a cover of a screw cap. 3. Hand lever operated pump according to one or more of the preceding claims or in particular according thereto, characterized in that the cover base (21) forms a suction pipe guide (38) extending on the storage chamber side. 4. Hand lever operated pump according to one or more of the preceding claims or in particular according thereto, characterized in that the suction pipe guide (38) has a sealing step (39) for interaction 21 706 VGN: 251712 Mü./P/G 18.05.1995 with a sealing counter stage (40) of the intake manifold (16) or the intake manifold holder (17). 5. Hand lever operated pump according to one or more of the preceding claims or in particular according thereto, characterized in that the pot-like recess (V) is rotationally symmetrical. 6. Hand lever operated pump according to one or more of the preceding claims 1 to 5, or in particular according thereto, wherein the return spring is designed as a bellows (20), characterized in that the suction pipe holder (17) has a radial recess (36) for receiving locking with a bellows base (35). 7. Hand lever operated pump according to one or more of the preceding claims or in particular according thereto, characterized in that a bellows cover (33) rests on the underside of the recess (V) as a counter bearing. 8. Hand lever operated pump according to one or more of the preceding claims or in particular according thereto, characterized in that a radially aligned air compensation channel (41) is formed in the top of the bellows cover (33), which continues into an axially oriented connection channel (42) in front of the jacket wall of the suction pipe guide (38). 9. Hand lever operated pump according to one or more of the preceding claims or in particular according thereto, characterized in that both the bellows base (35) and the bellows cover (33) project radially inwardly beyond the bellows folds (37) of the bellows (20). 21 706 VGN: 251712 Mü./P/G 18.05.1995