CH641248A5 - Manually actuated piston pump for delivering contents from a container, e.g. packaging container, into the open air - Google Patents

Description

641248

PATENT CLAIMS

1. Manually operated piston pump for conveying filling material from a container into the open, characterized by a piston (5) arranged axially displaceably in a cylinder housing (8), on one end face of which a pump chamber (20) is arranged in the cylinder housing, with pistons and cylinder housing for executing a compression stroke and a suction stroke as pump parts which can be moved back and forth between an outer and an inner piston position, further characterized by an inlet (E) on one of the pump parts for connecting the interior of the container to the pump chamber, and by an outlet (A) on one of the pump parts for connecting the pump chamber to the outside, further characterized by 15 cooperating control edges provided on both pump parts for alternately opening and closing the inlet and outlet during the relative reciprocating movement of the pump parts, such that alternate filling in the pumps sucked chamber, expelled from this and removed from the container filling 20 is replaced by air.

2. Piston pump according to claim 1, characterized in that control edges which limit inlet (E), outlet (A) and overflow channels (16, 18, 570) have such mutual positions, 25

- That a connection from the outlet (A) to the pump chamber (20) is open in the region of the inner half of the piston stroke and is closed in the outer piston position and in the region of the piston stroke adjoining it, and 30

- That a connection from the inlet (E) to the pump chamber (20) is open in the area of the outer half of the piston stroke.

3. Piston pump according to claim 2, characterized in that the connection from the inlet to the pump chamber with the inner piston position and in the subsequent stroke range is closed (Fig. La, 2a, 3a).

4. Piston pump according to claim 2 or 3, characterized in that both the connection from the outlet (A) to the pump chamber (20) and from the inlet (E) to the 40 pump chamber are closed in a stroke range, such that in the pump chamber at Pushing in the piston creates an overpressure, while pushing it out creates a negative pressure (Fig. 3b, 5d).

5. Piston pump according to claim 4, characterized in that there is a compressible medium in the pump chamber (20) or in a cavity (15) directly connected to it in the piston.

6. Piston pump according to claim 5, characterized in that the compressible medium is air. 50

7. Piston pump according to claim 5, characterized in that the compressible medium is enclosed in the cells of a piece of foam.

8. Piston pump according to claim 4, characterized in that it has a bordering on the pump chamber or 55 connected to it elastic wall part.

9. Piston pump according to claim 4, characterized in that seals between the piston and the housing allow a leakage current of a sufficient size for pressure compensation.

10. Piston pump according to one of the preceding claims, characterized in that a way for ventilation of the container (1) leads to the replacement of dispensed filling material by the piston pump (Fig. 5b).

11. Piston pump according to claim 10, characterized in that in a stroke range between the end positions there is a connection from the inlet (E) to the outlet (A) (Fig. 3b, 5b).

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12. Piston pump according to one of the preceding claims, characterized in that a return spring (354) is provided which engages on the one hand on the housing (8), on the other hand on the piston (5) and presses the piston into its external rest position.

13. Piston pump according to one of the preceding claims, characterized in that inlet (E) and outlet (A) are provided in the same pump part and through separate wall openings (E, A) of this pump part open into the interior (25b) of the housing and that on another pump part, an overflow channel (12, 236) is provided which, depending on the piston position, connects the inlet and / or outlet with the pump chamber (20) (FIGS. 1 a, 2, 3, 4).

14. Piston pump according to claim 13, characterized in that the wall openings of the inlet and outlet are offset in the axial direction (Fig. 3.4).

15. Piston pump according to claim 12 or 13, characterized in that the inlet and outlet are provided in the housing and that the overflow channel (12) extends in the longitudinal direction of the piston and from the pump chamber (20) to an opening (18) in the outer wall of the piston leads (Fig. La, 3,4).

16. Piston pump according to claim 15, characterized in that at least three ring seals (341, 343, 344) offset from one another in the axial direction are provided between the housing and the piston, of which the outermost (341) seals the interior of the housing to the outside, the innermost (344) one Establishes or blocks the connection from the inlet to the pump chamber and separates the inlet from the outlet in a stroke area near the outer pitch of the piston and an intermediate ring seal (343) which separates the inlet from the outlet in another stroke area, and that the opening (318) of the overflow channel ( 312) lies between this and the outermost ring seal.

17. Piston pump according to claim 16, characterized in that the ring seals are provided on the piston, that the outermost and the innermost at the effective outer or inner end of the piston is arranged, that the outermost ring seal is in all piston positions outside the outlet wall opening.

18. Piston pump according to claim 16 or 17, characterized in that a fourth ring seal (342) is arranged on the piston between the opening (318) of the overflow channel (312) and the intermediate ring seal (343), that the fourth ring seal shortens the stroke range, within a connection from the outlet (A) to the opening (318) of the overflow channel (312) and the generation of an overpressure or underpressure.

19. Piston pump according to one of claims 16 to 18, characterized in that the distance between the innermost and the outermost ring seal (341, 344) is greater than the distance between the control edges of the inlet and outlet wall opening which face away from one another.

Piston pump according to claim 19, characterized in that, in order to produce a direct ventilation path between the outlet and the inlet, the intermediate ring seal (343) is arranged such that it lies in a stroke area in which the innermost ring seal (344) between the inlet wall opening and the closed cylinder end, opens a connection from the outlet to the inlet wall opening.

21. Piston pump according to one of claims 16 to 20, characterized in that the distance between the innermost and the intermediate ring seal (344,343) is smaller than the distance between the mutually facing control edges of the outlet and inlet wall opening.

22. Piston pump according to claim 13, characterized in that the overflow channel (12,412) with a second

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Opening (16,416) in the outer wall of the piston 34. Piston pump according to one of claims 26 to 33,

is bound and that the second opposite the first opening is characterized in that between the housing and

(18,418) is offset against the inner end of the piston. the piston at least four against each other in the axial direction

23. Piston pump according to claim 22, characterized in that offset ring seals (541 to 544) are provided, characterized in that the second opening (416) between the inner 5 35th piston pump according to claim 34, characterized in ring seals (444,445) and The intermediate ring seal shows that there are four ring seals (443) on the piston. the innermost (544) and the outermost (541) close to the effective

24. Piston pump according to claim 13 or 14, wherein ends of the piston are arranged in such a way that the outlet indicates that an inlet channel and an outlet channel are provided in the wall opening (A) between the outermost and one of its pistons, each of which has a wall opening io adjacent ring seal (542) and that the openings (A, E) lead in the outer wall of the piston, which (518) of the first overflow channel (512) are axially offset from one another between the last wall openings, that the named ring seal (542) and a further ring between the overflow channel (236) in the longitudinal direction of the housing of the water and the innermost ring seal (544) of the pump chamber to an opening (238) in the inner wall seal (543).

the housing and that in a stroke range is close to 36. Piston pump according to Claim 34 or 35, thereby

In the innermost piston position, the wall opening of the Aus indicates that the distance between the outermost and lasskanals with the outside opening of the overflow channel, the next but one ring seal (541, 543) is larger than the nals and in a stroke range close to the outermost piston distance between the facing control edges

Position of the wall opening of the inlet duct with that of the inlet wall opening and the overflow duct

Opening communicates while the other 2o (570).

Wall breakthrough is blocked (Fig. 2). 37. Piston pump according to claim 34 or 35, thereby

25. Piston pump according to claim 24, characterized in that the distance between the two of the opening marks that three ring seals provided on the piston (518) adjacent ring seals (542,543) are larger, that the inlet wall opening between the ring is as the distance between the facing control seal (244) and an intermediate ring seal (243) is 25 of the inlet wall opening (E) and the over and that the outlet wall opening between the outer flow channel (570).

most ring seal (241) and the intermediate ring seal is 38. Piston pump according to one of claims 26 to 37,

(Fig. 2). characterized in that the housing (708) for formation

26. Piston pump according to one of claims 1 to 12, that the overflow channel (770) has a wall opening characterized in that the inlet (E) in one and 30 and that a sleeve-like outer housing (786) the wall-the outlet (A ) provided in the other pump part are breached to the outside. (Fig. 7).

and through a wall opening in the interior (556) 39. Piston pump according to Claim 38, characterized in that the housing opens and that in each pump part at least indicates that the housing (708) has an overflow channel (512, 570) to form an inlet box. is provided. nals (726) has an outer longitudinal groove and that this

27. Piston pump according to claim 26, characterized in that it is closed off to the outside by the outer housing (786), that the first overflow channel (512) is in one pump.

Part the pump chamber (520) with a further outward 40th piston pump according to one of the preceding openings (518) to the interior of the housing, characterized in that it connects to the pumps and that the overflow channel (570) opens into the other chamber overflow channel (18, 236 ) is provided in a pump part and leads to the interior of the housing 40 horizontal position of the housing upper part of the pump chamber. mer (20) applies.

28. Piston pump according to claim 27, characterized in 41. Piston pump according to one of the preceding indications that the first overflow channel (512) runs in the longitudinal direction, characterized in that when the piston is conveyed, and that its opening (518) extends to Liquid with the admixture of air, the ratio of the outlet channel (530) provided in the interior of the housing from the wall opening (A) of a volume of air and liquid conveyed in the piston free is determined by the lengths of the stroke ranges in which compression (542 ) of the piston is separated. connections from the inlet to the pump chamber and from the outlet

29. Piston pump according to claim 28, characterized are opened to the pump chamber.

shows that the second overflow channel (570) in the housing 42. Piston pump according to one of claims 16 to 41,

is provided. 50 characterized in that the ring seals sealing rings

30. Piston pump according to claim 29, are characterized, which are in particular attached to the piston.

characterized in that the second overflow channel (570) by a rapid 43. piston pump according to one of claims 16 to 41,

diale housing bore is formed, the outer end of which is characterized in that the ring seals are cylindrical

a plug (572) is sealed. see ribs of pistons and / or housing.

31. Piston pump according to claim 29 or 30, characterized in that the piston pump according to one of the preceding indications that the second overflow channel (570) speaks in, characterized in that the piston has an opening (518) of the first shaped handle (562) (Fig. 5.1).

Overflow channel (512) with the outlet wall opening 45. Piston pump according to claim 44,

(A) connects (Fig. 5c). records that a return spring (554) between the handle

32. Piston pump according to claim 29 or 30, thereby 60- (562) and housing is arranged.

indicates that the second overflow channel (570) in a 46th piston pump according to one of claims 1 to 43,

in the second stroke range, the outlet wall opening (A) is characterized by that the housing is designed as a handle.

connects the wall opening of the inlet (E) (Fig. 5b). forms is (Fig. 2).

33. Piston pump according to claim 29 or 30, thereby 47. Piston pump according to one of the claims 1 to 43, in which the second overflow channel (570) is characterized in 65 by the fact that the housing has one end means for the further stroke range of the inlet (E) with the opening (518) attached to the container and at its other end one of the first overflow channel (512) and thus with the pump holder (888) for a trigger (887) and that chamber (520) connects (Fig 5e). a knee between the trigger and the piston (805)

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lever unit (890) for transmitting the movement of the housing only execute a relative translatory movement

pull lever is provided on the piston (Fig. 8). ren, i.e. a pure shifting movement without turning the

48. Piston pump according to claim 47, characterized in piston against the housing.

indicates that the toggle lever unit is made of a Y-shaped piece. The pump can be in the outermost piston position of elastic plastic, of which one arm (891) adjoins the trigger lever (887) and another by means of a return spring Arm (893) on the colt; the pump can be used in the simplest way in its ben (805) and the third arm (892) on the holder (888) - rest position as container closure.

support. Appropriate further training can achieve

49. Piston pump according to one of the preceding claims, that the pump would also speak in its inner piston position, characterized in that the piston is shut off a sleeve OK. To save space, it may be appropriate to wear, which is formed in one piece with sealing rings and has the piston fully pushed in during opening and has openings (518, A) that each of these rings has a bar. In this position, too, no filling material can have out-sis and tapers outwards to a sharp edge.

that each ring has two flanks, one of which has a corresponding mutual arrangement of the control

Increasing the resistance of the ring during the pressure stroke is edging can ensure that an overpressure is generated in a region of the pressure stroke at an acute angle with respect to the piston axis and the connection is inclined (FIGS. 5, 6). only then from the pump chamber to the outlet

50. Piston pump according to claim 49, characterized is opened. Then the filling suddenly emerges. Characterized in that the other flank of each ring in longitudinal section, the spray effect is improved. When the opposite is arched. A vacuum occurs in the upper movement before the intake stroke

Pump chamber on. As a result, the filling material suddenly shoots out of the container into the pump chamber, which above all improves the cleaning of the connecting channel from the container. The invention relates to a manually operated piston pump chamber. Pumps that generate a surplus pump for conveying filling material from a container for 25 or negative pressure must be prevented from conveying filling material from a container, e.g. Pack the pump chamber completely with liquid because the container is outside. The pump could then also be blocked as a pump system against further movement. Serve container closure. Important areas of application for In a further development according to claim 6, such a pump can be provided in the pump chamber or in a nisse or cleaning agent as a jet, as a spray or as a cavity directly connected to it. Foam. The pump is expediently designed in such a way that

Known piston pumps of this type are drawn into the pump chamber with non-return air in a first stroke range.

valves equipped. This requires a relatively large number and in a further stroke range in the container,

of components and thus significant costs for

Manufacturing and assembly. Pumps with non-return valves 35 A direct connection from the outlet to the inlet is prone to failure due to jamming, sticking or otherwise.

total contamination of the check valves. The inlet and outlet can be divided into two fundamentally different

Known pumps convey liquid filling material without air lines on the two pump parts, namely pump mixture. This leads to difficulties when the liquid pistons and housing are arranged. Inlet and Austeit should be sprayed. The spraying is then only 40 can be provided on the same pump part, e.g. am by mechanically tearing the liquid into individual housings. During the pumping process, the plunger is allowed to drip by hand, but as a result, it does not move finer than the housing attached to the container. The spray mist can be achieved. The outlet nozzle remains at rest, which for many users

The invention is intended to provide a pump which is preferred initially. You get the same result

called type are created, which on the one hand the packaging 45 if one provides inlet and outlet on the piston and can shut off the container, but on the other hand connects the loading piston to the container. Then the housing is moved relative to the piston by hand ventilation of the container for the use of dispensed filling material. Can also serve in this. An aeration channel should not be trapped directly from the outside. The nozzle now connected to the container should lead into the container, since the filling material then stops during transport.

could run, but should run through the pump and in a 50-

locked off rest position. leave on a pump part, e.g. attached to the housing and

Spraying of liquid with air at the outlet at the other, e.g. on the piston. Here too, a schung is made possible. Reversal possible in such a way that the piston on the loading

It is said to be an alternative to aerosol sprayers created more attached and the housing is operated by hand. Be in. Pumps according to the invention are intended to make it possible in these cases for the outlet opening to expel the pumping movement of the filling material under excess pressure, in particular with. Pumps of this type are particularly easy to manufacture,

spray. The arrangement is expediently such that the individual

All of this is at the same time by the invention according to claim zige connection from the container to the outside through

1 reached. Pump system runs through the mouthpiece

Piston pumps are known in mechanical engineering and for other applications at the outlet channel, liquid or air entering areas of application, which can without recoil. In this way, a reliable completion of the loading

valves work. With these, however, additional containers can either be achieved externally by the pump itself. At least

Parts, such as slides, are available for the control or, at least in the rest position with the piston in the outer position,

parts for rotating the piston. Such a construction, even if the piston is fully inserted, is the oral

Nen are blocked off from the inside of the container for reasons of cost for a mass article, such as the 65 pieces.

Pump according to the invention, not usable. Embodiments of the invention are as follows

In contrast, the invention describes a pump with reference to the drawings.

create, in which this effort is omitted, since piston and Figure 1 shows a packaging container in perspective

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with a manually operated piston pump. For the functional description, however, schematic sectional representations of upward movement from the position according to FIG. La to the pump provided in this container are started in different form according to FIG. In the position according to FIG. 1 a, phases of a complete piston stroke are. Inlet and cross channels 16 and 18 are blocked off here. If the piston is provided on the housing after outlet. 5 moves to the right, so the pump chamber FIG. 2a and 2b are schematic sectional representations mer 20, and the transverse channel 18 is connected to the outlet of a pump, but with the inlet and outlet on the piston. As a result, air is provided through outlet A into the pump. Pen chamber 20 sucked. Here, the mouthpiece 9, FIGS. 3a to 3c, are longitudinal sections through a pump with an inlet and outlet provided between the outlet and the outlet, in a longer outlet channel and the outlet itself from phases different therein Hubes. adhesive filling material from a previous pumping

Figures 4a to 4c show in longitudinal sections, partly cleaned in silt. When the piston 5 continues to move according to the ten view, a pump similar to the pump according to FIG. 1 in the right, the transverse channel 18 is shut off (FIG. 1 c) during different phases of a stroke. the cross channel 16 is still blocked. In the presentation

5a to 5f are schematic longitudinal sections through 15 according to FIG. 1c, this is only during a vanishingly small pump in which the inlet on the housing and the outlet on the NEN stroke range are the case. The transverse channels as well as the inlet and piston are provided, but can also be arranged in different phases of a com- outlet so that both complete strokes. Cross channels during a considerable displacement figure 5.1 and 5.2 show partly in side view to remain closed at all times. In this case, in the pump section in longitudinal section, structural details of a pump 20 chamber 20 during the outward movement of the piston are an un-according to Figure 5a to 5f. terdruck (and in the later to be described

Figures 5.3 to 5.6 are variants of a pump according to the figure inward movement an overpressure).

5.1 and 5.2, which, however, also have significance for other designs. Cross channel 16 connected to the inlet E during the

Figures 6 and 7 show in longitudinal section two further cross-channel 18 remains blocked. There will now be liquid management forms of pumps. through the suction tube 10 into the pump chamber 20 geFigur 8a and 8b show in longitudinal section, partly in sucks. If an underpressure in the side view of the pump chamber had previously formed an actuating mechanism for a pump, this happens suddenly. Has the piston according to the invention. reached its rest position (figure le), so are both again

Figure 1 shows a container 1, which is blocked for receiving one in the 30 cross channels. But there are also inlet E and exit

Free fillings to be expelled, in particular a liquid outlet A, are blocked off from the pump chamber 20. Ru-keit serves. The container has a cap 3 with a position is also the transport position of the pump. In

Mouthpiece 9, e.g. can be designed as a nozzle. In this position, both the contents of the container and the

Sealing cap 3 accommodates the pump content of the pump chamber 20, which cannot be seen here, opposite the outlet from which a piece of the piston 5 with Be-35 is blocked. The outlet had previously protruded in the phase according to FIG. 1b actuation button 6. has been freed of liquid. As a result, able

Figures la to le show, highly schematized, that according to figure le no liquid during transport of the unit formation of the pump housing 8 and the piston 5 from the pump and container individually.

nen. The housing has an inlet E at the bottom and the one at the top. The pump chamber 20 is only partially with liquid

Outlet A. E and A are filled in this and in other figures. In the horizontal position, the liquid is always the openings or wall openings of the housing mirror below the mouth of the overflow channel 12 at ses (or in FIGS. 2a and 2b of the piston), the front 14 of which.

Form the edges of the control edges. E and A, on the other hand, denote the channels attached to these openings when the piston is pushed in from the position toward Fi. The inlet becomes the content of the pump chamber 20 and let E is compressed in a known manner with a suction tube 10 45 of the channels until the transverse channel 16 connects to the one that leads into the container 1. Inlet E opens. From then on, air and possibly part of it. An overflow channel 12 leads at the top of the piston, from which the liquid from the pump chamber 20 through the channels face side 14 axially parallel to the right to a cavity 12 and 16 through the inlet E and the suction tube 10 in FIG. 15. A compressible medium, the container, can be pushed back into the cavity 15. As a result, the entire approach is cleaned like a sponge with closed pores and 50 suction channels. Most of all, there will be particles that are going on. The overflow channel 12 has accumulated narrow points through two transverse channels and connected the suction line ver-16 and 18 to the outer wall 19 of the piston, conveyed back into the container (FIG. 1d). After that. The transverse channel 18 sits at the right end of the overflow, the transverse channel 16 with further inward movement of the piston channel 12 and leads upwards. The transverse channel 6 continues to be blocked off (FIG. 1c) and before the transverse channel 18 turns left and leads downwards. 55 opening A opens in the pump chamber

The control edges mentioned above are generated by the Rän overpressure. During the wall breakthrough of the cross

that of outlet A and inlet E on the inner wall channel 18 sweeps over outlet A (FIG. 1b), the In-21 of the housing and on the other hand is driven out by the edges of the transverse hold of the pump chamber through outlet A,

channels 16 and 18 on the outer wall 19 of the piston Finally, the transverse channel 18 is shut off (Fig. la).

forms. 60 The embodiment according to FIG. 1 also works

Figures la to le show, from top to bottom when the container is tilted so that its longitudinal axis is trending, a suction stroke, viewed from bottom to top, lies horizontally and the actuating button 6 is at the top. pressure stroke. Once the pump has been moved through a few pumping operations in GeFigur la shows the innermost position, figure le shows the outermost position, it always remains operational. By means not shown, 65 is prevented. In the idle state according to FIG. Le, the pump chamber contains that it continues to escape. In addition, there is a liquid, not shown, and when the piston is pressed in, a pressure spring is provided which releases the piston into the position le liquid. This also applies to the following brings, which is accordingly the rest position of the pump. Embodiments.

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The volume of liquid expelled from the container must normally be replaced by an equal volume of air if the container is not to be compressed. In the embodiment according to FIG. 1, there is no direct connection from the outlet to the inlet in any phase. However, as described above, in the phase according to FIG. 1d, before the start of an expulsion process, air is first forced through the inlet into the container. This serves to compensate for the liquid removed during the previous pumping process.

FIGS. 2a and 2b show a pump in which inlet E and outlet A are provided in the same pump part, but instead of in the housing in the piston 205.

Here, as in the following figures, the last two digits of all reference numerals designate the same components throughout. The first digit indicates the figure, so 200 numbers refer to Figure 2,300 to Figure 3 etc.

The piston 205 can be attached to a container with the aid of a screw cap 224. The piston 205 has an outlet tube 234 with the mouthpiece 209. An outlet channel 264 leads from the mouthpiece to the outlet A. The piston has sealing rings 241, 243 and 244. The outlet A lies between the sealing rings 241 and 243. From the inlet E, which is between the sealing rings 244 and 243, an inlet duct 227 leads downward. Its lower end is connected to the suction tube 210.

As in the following exemplary embodiments, the control edges here are not the borders of inlet E and outlet A but the adjacent sealing rings.

An overflow channel 236 is provided in the housing 208.

In the position according to FIG. 2a, the pump chamber 220 is connected to the outlet A via the overflow channel 236. If the housing 208 is moved upwards, which is done by the return spring (not shown here), air is sucked in through the outlet A until the sealing ring 243 has passed the lower opening 238 of the overflow channel. Upon further upward movement of the housing, liquid is drawn into the pump chamber through inlet E and overflow channel 236.

If the housing is then pressed down by hand against the force of the return spring, air and possibly some filling material are first pushed back into the container through the overflow channel 236, the inlet E and the inlet channel 227 until the opening 238 of the overflow channel 236 down the sealing ring 243. From then on, the filling material and air are expelled from the pump chamber 220 through the overflow channel and the outlet A.

There is a direct connection to outlet A and inlet E when opening 238 moves over sealing ring 243. Air can then flow into the container around the sealing ring 243 to compensate for the removed filling material.

FIGS. 3a to 3c show an embodiment of the pump in which the outlet and inlet are provided in the housing 308.

The piston has an actuating button 306. Above the housing 308 there is a guide part 322. The guide part and the housing have outer flanges and are fastened to the container mouth with the aid of the screw cap 324. At the inlet E of the housing 308 there is the downward inlet channel 326, which leads to the suction tube 310. An outlet channel 328 leads upward from the outlet A in the housing 308 and continues in an outlet channel 329 of the guide part 322.

The piston in turn has an overflow channel 312, the upper end of which is connected to the outer wall of the piston via the transverse channel 318. The lower part of the overflow channel 312 has an extension 332 which receives the return spring 354.

The uppermost position of the piston is given by the abutment of its upper end on the base plate of the guide part 322 (FIG. 3c), the lower end position of the piston (FIG. 3a) by the abutment of the lower edge of the actuation button 306 on the base plate of the guide part 322.

The piston has four sealing rings 341 to 344. The distribution of the sealing rings over the longitudinal direction of the piston and the position of the transverse channel 318 and the positions of the inlets E and A are decisive for the function of the pump, as will be described in more detail below with the aid of another exemplary embodiment.

In the rest position according to FIG. 3c, outlet A is shut off by the piston. In contrast, the inlet E is connected to the pump chamber 320. However, this is not harmful since the transverse channel 318 is blocked off against the housing wall, that is to say that liquid cannot get into the outlet.

The function is again starting from the lowest,

So innermost piston position (Fig. 3a) described. In this position, the pump chamber 320 is connected to the outlet A. When the piston is moved upward, suction is first drawn through the mouthpiece 309, the outlet channels 329 and 328 and the outlet A, as a result of which these parts are freed of liquid. Air and liquid enter the pump chamber 320 through the overflow channel 312. This stops as soon as the sealing ring 342 passes the upper edge of the opening of the outlet A upwards. Then there is a direct connection from outlet A to inlet E. The pump chamber is completely shut off from the outside, so that when the piston moves upwards, a vacuum initially develops in it. As soon as the sealing ring 344 connects the inlet E to the pump chamber 320 during a further upward movement, liquid is suddenly drawn out of the container into the pump chamber. The suction process continues until the piston reaches its rest position according to FIG. 3c.

If the piston is depressed, air and possibly some liquid are first conveyed back into the container until the lowermost sealing ring 344 blocks the connection from the pump chamber to the inlet E (FIG. 3b). Now there is again a free connection from the inlet to the outlet, so that air can enter the container to replace the liquid previously sucked into the pump chamber. If the piston is depressed further, the air in the pump chamber 320, in the extension 332 and the channels 312 and 318 is compressed. As soon as the sealing ring 342 establishes a connection from the transverse channel 318 to the outlet A when the piston moves further downward, air and liquid suddenly emerge through the outlet A etc.

Figure 4a to 4c shows an embodiment similar to Figures la to le, but with sealing rings. In addition to the sealing rings 441 to 444, a further sealing ring 440 is provided. The piston has an extension or recess 432 at its left end, which merges into the longitudinal channel 412. A transverse channel 416 leads downward from this, a transverse channel 418 leads upward. A compression spring 454 is accommodated between the actuation button 406 and an outlet connection 452, which is used for pulling out, i.e. Back part of the piston in its right end position and rest position shown in Figure 4c is used. Parts, not shown, limit the piston stroke in this position.

The function of the embodiment according to FIGS. 4 to 4c is largely the same as that according to FIGS. In contrast to this, however, the inlet and outlet are offset from one another in the axial direction. Accordingly

6

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the transverse channels 416 and 418 also have a greater mutual distance.

In all the embodiments described so far, the inlet and outlet are located on the pump component connected to the container. Regardless of whether this is the housing or the piston, the outlet mouthpiece 9, 209 etc. remains at rest during the pumping process, i.e. it does not move in relation to the container. Embodiments will now be described in which only the inlet is provided in the housing, but the outlet is provided in the piston, and consequently the piston moves with it. During the pumping process, therefore, the mouthpiece 509 etc. moves with respect to the container.

Figures 5.1 and 5.2 show a pump with a pistol-like head. The piston 505 is inserted from the right into the hollow cylindrical interior 556 of the housing 508. A stop plate 558 inserted into the grooves of the housing from below forms a stop for the piston and defines its outermost position. In a downwardly open groove 560 of the piston, the helical compression spring 554 is accommodated, which presses the piston to the right in the position shown, namely the rest position. At the right end of the piston, a finger rest 562 is rigidly attached in the manner of a pistol trigger. The housing 508 is fastened to the neck of the container 501 by means of the union nut 524.

The stop plate 558 has two other functions: it engages with its upper end in the groove 560 and thereby prevents the piston from rotating about its longitudinal axis. It also serves as an abutment for the compression spring 554.

As in the exemplary embodiment according to FIG. 3, the piston has four sealing rings 541 to 544. There is again an overflow channel 512 which projects into the piston from the end face and which is connected by the transverse channel 518 to the upper outer wall of the piston. The cross channel 518 opens here, however, between the sealing rings 542 and 543.

The inlet E is in turn located in the housing 508, but here the outlet A is arranged in the piston itself and is connected to the mouthpiece 509 via the outlet channel 530. Overflow channel 512 and outlet channel 530 are separated from one another by a transverse wall 566. Outlet A lies between the sealing rings 541 and 542.

An overflow channel 570 is provided on the lower side of the housing inner wall 521. This arises from the fact that a plug 572 is inserted into a vertical housing bore from below. The plug closes this hole tightly to the outside, but leaves the overflow channel 570 free at the top.

The four sealing rings, the edges of the overflow channel 570 and those of the inlet E serve as control edges.

The overflow channel 570 works together with the sealing rings 542 and 543, while the two outer sealing rings 541 and 544 ensure the two outer piston ends and never reach the area of the overflow channel.

Figures 5a to 5f illustrate essential operating phases. Shortly after the outward movement of the piston begins, the sealing ring 542 sweeps over the overflow channel 570 to the right (FIG. 5b). Here, air is drawn from the outlet A, through the overflow channel 570, the cross channel 518 and the overflow channel 512 into the pump chamber 520. Here, the mouthpiece 509, the suction channel 530 and the other parts mentioned are cleaned of liquid from a previous pumping process. As soon as the sealing ring 542 has exceeded the right control edge of the overflow channel 570 (FIG. 5d), this intake of outside air stops. The overflow channel is now shut off by the two sealing rings 542 and 543. As a result, outlet A is blocked off from inlet E. If the distance between these sealing rings is greater than the axial length of the overflow channel, a negative pressure is generated in the pump chamber during the outward movement of the piston and as long as both sealing rings 542 and 543 are outside the overflow channel 570. (Conversely, an overpressure is generated in this phase when the piston is pushed in). The sealing ring 543 then sweeps over the overflow channel 570 to the right (FIG. 5e). In this case, liquid is drawn from the container into the pump chamber 520 from the inlet E, through the overflow channel 570, the transverse channel 518 and the longitudinal channel 512. The suction process continues after the sealing ring 543 has exceeded the right control edge of the overflow channel 570, since then the sealing ring 512 has exceeded the inlet E (FIG. 5f). It is then drawn directly from the inlet E into the pump chamber 520.

When the piston is pushed in, the pump positions are run through in the sequence from FIG. 5f to FIG. 5a. In the positions according to FIGS. 5f and 5e, air and, in part, liquid are conveyed from the pump chamber 520 into the inlet E in the described ways until the sealing ring 543 has exceeded the left control edge of the overflow channel 25 570 to the left (FIG. 5d ). It is then compressed until the sealing ring 542 crosses the right control edge of the overflow channel 570 to the left. FIG. 5c shows the actual expulsion process, in which the sealing ring 542 sweeps over the overflow channel 570. Liquid and air 30 are forced out of the pump chamber 520 through the transverse channel 518, the overflow channel 570 and the outlet A. Towards the end of this process, there is a direct connection between the pump chamber, inlet and outlet (FIG. 5b). Here, replacement air can get into the container, but the expulsion process can still continue. Finally, if the sealing ring 542 has exceeded the left control edge of the overflow channel 570 (FIG. 5a), then the outlet A is blocked off from the pump chamber and the inlet E by the sealing ring 542. The inlet E is connected via the transverse channel 518 to 40 of the pump chamber, which is reduced here to the space of the overflow channel 512.

In the rest position according to FIG. 5f, the outlet A is likewise blocked off by the sealing ring 542 against the pump chamber and the inlet E, while the inlet E is directly connected to the pump chamber 520. In both end positions, the pump acts as a seal to the outside of the container.

If the mutual distance between the sealing rings 542 and 543 is greater than the distance between the right control edge of the inlet E and the left control edge of the overflow channel 570, direct ventilation of the container is possible, as shown in FIG. 5b. Here, a connection path from the outlet A through the overflow channel 570 directly to the inlet is free. On the other hand, if the distance between the sealing rings 542 and 543 is smaller than the distance between the last-mentioned control edges, direct ventilation is not possible. The required replacement air is then conveyed only from the pump chamber 520 into the positions according to FIGS. 5f, 5e and 5b when the piston moves inward into the container.

As FIG. 5.3 shows, a sleeve 574 made of elastic material can be provided to form the four sealing rings 541 to 544, which sleeve is pushed over a piece of the piston 505 ', which is made of hard material.

As FIG. 5.4 shows, pistons and sealing rings can instead be made of hard material and only be covered by an elastic sleeve 575.

A better mixture of air and liquid can be achieved by the embodiment according to FIG. 5.5. In the

50

55

60

65

641 248 8

Overflow channel 512 of the piston 505 "'is a plug 576. In this case, an arrangement according to FIG. 8 is also used, on the outer surface of which a trigger lever starting at the top and a mechanical translation by a

helical channel 578 is provided, which is advantageous from the left NEN lever.

leads to the right end of the plug. In addition, a longitudinal channel 580 can be provided on the underside of the stopper on the underside of the stopper, as in the embodiment according to FIGS. if the piston is guided over its entire length in the channel of FIG. 6, a housing which is to be arranged vertically on a container is sealingly guided. However, a pump with an embodiment with ring seals that can be operated by a finger is more advantageous. There are many actuation buttons 606 and a helical compression spring 654 which presses the piston upwards in known ways to achieve such ring seals, its idle position pressing helical compression spring 654. len shown or provided by sealing rings in the housing channel or channel 626, vertically upwards in the piston by the fact that in at least one of the two parts there is an outlet channel 630 running through the ring nut. The mouthpiece 609 aligns the ten so that those emerging between ring grooves are located Beam sideways. remaining parts act as ring seals.

A large part of the pump is located below the is. By changing the position of the ring seals, the upper cover plate of the screw cap 624 can be changed and the ratio of the filling material to the air when it strives can be changed into the container (not shown here). As a result, as well as the size of an overpressure or underpressure, the total height of the unit consisting of the pump and packaging is formed in one stroke area.

container lowered. In pumps with a movable outlet according to FIGS. 5,

The pump operates in the manner shown in FIGS. 5a to 5f 20 6 and 7, only four ring seals are required. In a completely described way. inserted piston must the ring seals or

If the pump is to be used in the head position, e.g. Sealing rings 541,641,741 the overflow channel 570,670,770

seal for spraying liquids under furniture or to the outside. With pulled out to the stop

to expel foot powder, a plunger 684 must have a piston, the ring seals or sealing rings 542

and the suction tube 610 removed. The lower 25 in FIG. 6 etc. stand outward from the overflow channel 570, so that the

The end of the inlet channel 626 can be separated from the pump chamber and the inlet by another stop outlet.

fen be closed. Corresponding changes to be blocked. The distance between the rings 541 etc. and

Driving out in the head position can also determine the minimum length of the housing interior with the other 544 etc.

Embodiments are made. with 556 etc.

FIG. 7 shows another embodiment of a pump 30 positions according to FIG. 5d, in which the sealing rings 542 with the piston fully pressed in. The compression spring provided in the interior of the overflow and 543 on both sides of the overflow channel 570 and flow channel 712 was not shown here as the inlet E by the two sealing rings 543 and 544. In the embodiment according to FIG. 7, which is blocked, during the piston movement, as long as this outflow channel 770 and the inlet channel 726 remain on simpler seals, a transfer is formed, namely by dividing the housing 35 under pressure or negative pressure in the pump chamber. If it were in an inner housing 708 and an outer housing 786. Both pump chambers are filled exclusively with liquid, so that they can be inserted into one another with mutual sealing. Because of the incompressibility of liquids, an annular space 788, piston movement remains between the two housing parts, preventing the pump from functioning and thus the radial opening in the inner housing. If the rings are thus arranged, overflow channel 770 forms. The inlet duct 726 is formed by the fact that the generation of an overpressure or underpressure forms an outer longitudinal groove in the inner housing 708. This is possible, so it must be ensured that, in addition to the embodiment, there is always air in the pump chamber in the manner described with reference to FIGS. 5a to 5f. or you have to provide elasticity in some other way,

Figures 8a and 8b show a pump according to Figure 3, each e.g. through a flexible wall of the housing or piston but can be actuated by a trigger lever 887. Figure 8a 45 or by inserting compressible solid material, e.g.

shows the upper, Figure 8b, the lower end position of the piston a piece of foam with closed pores. Closing

805. At the upper end of the housing 808, a trigger loan can be used to provide a leakage current of sufficient size for a housing 888. The trigger 887 is there to ensure pressure equalization.

an axis fixed to the housing 889 pivoted. The overflow channel 570 etc. must have sufficient steering of the pivoting movement of the trigger lever 887 to a length of 50 °, so that the sealing ring 542 flows around it

A toggle lever unit 890 serves for vertical piston movement. A sufficient quantity of filling material from the pump chamber

It consists of a Y-shaped piece of elastic that can be driven to the outlet. Should the delivered

Plastic, which has three arms 891, 892 and 893, which are increased in quantity, so this can be flexibly connected to one another by extending the. The outer ends of the overflow channel 570 happen. Instead, the

Arms 891 and 893 are more on trigger 887 and piston 55 sealing ring 542 against the outer end of the piston

805 while the outer end of arm 892 will lie down, causing the compression phase before the

is supported in an inner corner of the trigger housing 888. The actual expulsion process is extended and thus at

Functioning of the toggle lever unit, the product is suddenly clearly recognizable from both figures opening the overflow channel. Reduction of the excess pressure is driven to the outlet.

The outlet channel 828 continues in the trigger housing 888 60. The following relationships also apply: If you enlarge by a tube 829 that leads to the mouthpiece 809. for a given total length of the housing interior

The pump according to each of the described embodiments, the distance between the rings 542 and 543, etc., for example, can work in very different positions, namely the phase within which the horizontal, vertical, and even the pressing in of the bend is increased Upside down. Piston an overpressure is generated. At the same time, however

The diameter of the pump chamber and the actual expulsion time are reduced. The reverse applies to

Pistons made relatively large compared to the narrowest cross - a reduction in the distance mentioned.

If the piston stroke is short, the control edges are arranged so that the outlet discharges a relatively large volume of filling material over a relatively long stroke distance with the pump chamber

9 641248

is connected, on the other hand the inlet via a relatively short shaft only with the piston pulled out as far as it will go

Stroke, the pump conveys a mixture with a relatively direct connection between the pump chamber 420

high air content and relatively low liquid content and and the inlet E, through which a vice versa in the rest position of the pump. Exchange of filling material between pump chamber and container

In pumps according to the figures la, 2,3,4 and 8, the s ter is possible.

Outlet arranged immovably in relation to the container. Housing channel and piston as well as the ring seals

In these embodiments, only three ring seals will be generally circular, but may also be required. deviating from the circular shape, e.g. elliptical or multiple

The ring seal or the sealing ring 342 etc. can have nacky shapes. The term “sealing rings” or “ring-shaped is not applicable, unless it is intended to use an over- or io seal”. Non-circular seals should therefore also generate negative pressure during the pumping process. At embrace.

fully inserted piston must be the most extreme. The design of the pump allows

Seal ring 341 etc. stand outside outlet A. In the case of changes in control edges, ensure that either the piston pushed out to the stop, the innermost little liquid has to be conveyed with a lot of air or

Seal ring 344 etc. stand outside inlet E. He has returned. In order to generate a liquid mist, the distance between the sealing rings 341 and 344 etc. on the conveying side is preferably determined by a lot of air. If, on the other hand, as much as possible the minimum length of the housing interior 356 etc. is to be dispensed, liquid per stroke, e.g. as a ray, so will

On the other hand, if the sealing ring 342, etc. is present, the pump must be set up to convey little air, and the means mentioned above must be used to ensure that the sealing rings can be designed such that when excess or negative pressure is generated, there are enough 20 against the front end of the piston, i.e. against the pump elastic means, which lock the pump chamber obliquely, so that they reliably prevent liquid during the pressure stroke. Seal the amount of sprouts casually and do not fold over. For some applications of filling material per stroke, the arrangement of the sealing traps can make it advantageous to determine the rings, rings 342 etc. instead. to run obliquely backwards. By order

A comparison with FIG. 3 shows that in the embodiment of oblique sealing rings, the spacing shape according to FIG. 4, the sealing rings 440, 444 and 445 and that which can be omitted between the housing inner wall, the transverse channel 416, can be reduced. If there is a and a piston sleeve during the pumping process, which the sealing rings do not want to generate an overpressure or underpressure, then this indicates. The rings can also be omitted at 45 degrees to the piston axis. The sealing ring 445 must be inclined and run out into a sharp edge.

C.

9 sheets of drawings