DE2227407B2 - - Google Patents

Description

The invention relates to a hand pump for conveying

tion of filling material from a container, which serves as a container closure and a plastic housing which contains a pump chamber, the volume of which by manually applied pressure in one of the direction deviating from the longitudinal axis of the container can be changed.

The conveyance of filling material from a container is currently still mainly carried out with the aid of propellants. There these mostly fluorine-containing propellant gases can affect the atmosphere, one goes increasingly today Measures on hand pumps to pump flowable substances out of a container by manual pressure. Since propellant gas containers are thrown away after emptying, hand pumps must be used to remove the Propellant gases should be so cheap that they can be used without a reasonable increase in the price of the product after emptying of the container with this can be thrown away. Another requirement placed on such hand pumps too is, is that with them a pressure can be generated that is at least the pressure corresponds to, under which the product is in a propellant gas container, since in many cases a sufficient one Atomization or a sufficient range can only be achieved with an appropriate pressure.

A decisive condition for the use of hand pumps in an industrial setting is their simultaneous use Can be used as a container closure, the connection with the container being achieved as easily as possible should be, e.g. B. by unscrewing.

The hand pumps on the market only meet the requirements listed above partly. A known hand pump is made of plastic for reasons of cost and forms a complete one Unit and can therefore be screwed fully automatically onto the container neck to close it. The volume of the pump chamber can be adjusted by manually exerting pressure in one of the Container longitudinal axis can be changed in a different direction. This allows a relatively large is Force exerted and a correspondingly high pressure generated. The disadvantage of this known Hand pump consists in that the pump chamber is a cylinder in which a piston is guided in a sealed manner However, piston pumps are very complicated and require a relatively large number of individual parts, which usually have to be assembled with considerable effort. The ventilation of the container to replace the discharged filling material can only be solved with considerable difficulty and usually leads to the fact that the The seal formed by the pump is not tight. The main problem, however, is that the manufacturing tolerances of a piston pump, especially in the area of the cylinder and the piston, are extremely tight.

They are very difficult to adhere to in plastic, so that, apart from the need for complex manufacturing methods, there is also a relatively large amount of rejects. So overall the manufacturing cost for one Mass articles of this kind extremely high.

From GB-PS 12 15 432 a hand pump has become known which contains a diaphragm pump instead of a piston pump, the pump chamber of which consists of two shots ^If- shaped parts connected to one another at their edge, one of which is made of rigid and the other of elastic plastic exists, and the latter can be pressed in by a plunger which can be actuated in the longitudinal direction by finger pressure in order to reduce the chamber volume, while the suction stroke is effected by a spring. The disadvantage of this hand pump is that it consists of a large number of individual parts, the assembly of which is expensive, and that no great force can be exerted by actuation in the direction of the longitudinal axis of the container.

It is also known from dtr GB-PS 6 47 604 a hand pump which has a pump chamber in the form of an elastic hose which is deformable by a lever for the purpose of carrying out the delivery stroke and returns to its original position after releasing the lever due to its own elasticity and thereby the Performs suction stroke. This hand pump is obviously not intended as a container closure and can therefore not meet the requirements placed on such pumps today. ω

The invention is based on the object of the known hand pump, which serves as a container closure and a pump chamber, the volume of which by manually applied pressure in one of the Container longitudinal axis deviating direction is changeable, so that they can be improved at low cost can be produced and can therefore be used as a disposable pump.

This task is done by the characteristics de? Characteristic of claim 1 solved

By replacing the piston-cylinder unit in the known hand pump with an elastic pump chamber it is achieved that the entire pump can be manufactured with very rough tolerances, since the The elasticity of the pump chamber compensates for these tolerances in the entire pump system manufacture the pump at an extremely low cost.

The pump chamber is preferably formed by a substantially tubular body thereof lower end receives the inlet valve and has a smaller diameter than the upper end.

The outer wall of the pump chamber can, together with a sealing seat, in the idle state To form a seal with the interior of the container to the outside. This training enables it to be extremely simple way to ventilate the container interior during the delivery stroke by the Sealing seat interacts with the area of the outer wall of the pump chamber, which is deformed during the delivery stroke, in such a way that that a connection between the container interior and the atmosphere is established during the delivery stroke will. The wall of the pump can simply be lifted off its counter surface in the housing during the delivery stroke which releases a gap through which air can flow into the container.

The proposed design makes it possible to form the outlet valve in that the upper end of the the elastic cylindrical body forming the pump chamber sealingly on a counter surface during the suction stroke in the housing and by the pressure generated in the pump chamber during the delivery stroke or by Deformation of the elastic body is lifted from this seat during the delivery stroke and thereby the Releases outlet opening. As a result, neither a separate valve body nor a spring is necessary for the outlet valve to build.

Advantageous further developments result from the subclaims.

Some embodiments of the invention are provided described below with reference to the drawings. It shows

Fig. 1 is a perspective view of a first Embodiment of a hand pump which is attached to the neck of a liquid container,

F i g. 2 is an exploded perspective view of the individual parts of the pump on an enlarged scale Scale,

3 shows a longitudinal section of the one on the neck? Container attached Fiimpe, with the Pumpenkai.imtr , is in the expanded state,

4 shows a section similar to FIG. 3, with the The pump chamber is in the compressed state,

F i g. 5 shows a section similar to FIG. 3 and 4, the pump chamber being shown enlarged and on the one hand air is sucked into the container and on the other hand liquid is sucked into the pump chamber will,

F i g. 6 is a cross section taken along line 6-6 in FIG. 3, F i g. 7 shows a section along line 7-7 in FIG. 4,

F i g. 8 a partial view of the outer housing of the pump from below;

9 shows a longitudinal section similar to FIG. 3 of a second embodiment of the invention,

10 shows a section similar to FIG. 3 of a third Embodiment of the invention, and

Fig. II is a longitudinal section of a fourth embodiment of the invention, the pump through Thumb pressure is operated.

The finger-operated pump 10 is attached to the neck 12 of a container 14 which holds the Contains liquid to be dispensed or sprayed.

In the embodiment according to FIGS Inflate an outer housing 16 and an inner housing 18 comprising a compliant tubular body 20 take up, which forms a pump chamber 22. F. in nozzle carrier 24, which is integral with the outer housing 16 may be, carries a lever mechanism 26 for compressing the wall of the tubular body 20 and thus the pump chamber 22.

The outer housing 16 serves to connect the pump to the neck 12 of the container 14 and assigns for this purpose an internal thread 28 which is connected to an external thread 30 on the neck 12 of the container 14 cooperates. The inner housing 16 is seated with a relatively tight drive fit in the inner cylindrical wall 32 of the outer housing 16 to secure the upper end of the tubular body 20 between itself and the To include the outer housing. An annular shoulder 34 of the outer housing 16 acts with the upper one Surface of the tubular body 20 together. In addition, the bottom 36 of the outer housing 16 is with an annular, downwardly extending projection 38 is provided which is connected to the upper end of the tubular body 20 cooperates to form an outlet valve 40. The bottom 36 of the Outer housing 16 continues in the outwardly extending nozzle carrier 24 and is with a A cavity 44 is provided which is in communication with an outlet channel 46 in the nozzle body 24. The outlet endc of the outlet channel 46 can be provided with the usual, interchangeable nozzles to the desired To maintain beam shape.

The inner housing 18 has a flange 48 extending radially inward at its lower end on that with the outer surface of the tubular body 20 cooperates to form an air inlet valve 50 which prevents the entry of air into the interior of the container 14 to replace the liquid drawn into the pump chamber 22. The upper end 52 of the Inner housing 18 has an outer conical surface 54 which has a corresponding shaped surface on the top End of the tubular body 20 receives the anchoring of the body 20 between the outer housing 16 and the. Inner housing 18 to facilitate. The bottom of the inner housing 18 is with a annular sealing lip 56 is provided which contacts the upper end face 58 of the neck 12 of the container 14. This seal is effective when the outer housing 16 is fully screwed onto the neck 12. That Inner housing 18 and outer housing 16 contain an opening 60 through which the lever mechanism extends 26 extends to change the volume of the pump chamber 22 during the pumping process.

The tubular body 20 consists of one of the known malleable, resilient substances of artificial or natural origin and is essentially a Elastomer. The upper end 62 of the tubular body 20 has a larger diameter than that lower end 64 and is provided with a radially outwardly extending flange 65, which in a below extending annular skirt 66 ends, which has an inner conical surface 68, which cooperates with the conical surface 54 at the upper end of the inner housing 18. As shown in FIG. 3 As can be seen, the periphery of the flange 65 and skirt 66 are between the adjacent surfaces of the

■ s inner housing 18 and outer housing 16 arranged to hold the tubular body 20 in place. The upper end 62 of the tubular body 20 is provided with an upwardly extending annular sealing lip 70 which is connected to the extension 38 on

ίο bottom 36 of the outer housing 16 cooperates to to form the exhaust valve 40, the opening and closing of which will be explained later. The middle part of the tubular body 20 is formed by a pear-shaped peripheral wall 72, which the pump chamber

r> mer 22 limited. The lower portion 64 of the tubular body 20 has an annular shape Valve seat 74, which forms an inlet check valve 78 with a valve ball 76, which on the one hand the entry of liquid from the container 14 into the

? n pump chamber 22 allows, on the other hand prevents withdrawing the liquid from the pump chamber 22nd Projections or ribs 80 may be arranged below the valve seat 74 in order to prevent the ball 76 from being pushed back into the lower section 64 of the tubular body 20 or even into the suction tube 82. The suction tube 82 is attached to the lower portion 64 of the tubular body 20 and serves to bring the liquid from the interior of the container 14 into the pump chamber 22.

so projections 84 in the tubular body 20 above the ball 76 limit the path of the same upwards. the The outer surface of the peripheral wall 72 interacts with the adjacent surfaces of the radial flange 48 of the Inner housing 18 together to the previously described

to form a bene air inlet valve 50.

In the embodiment according to FIG. 1 to 8 is the lever mechanism 26 on the nozzle carrier 24 attached by means of a hinge connection consisting of holes 86 in the outsides of the nozzle carrier 24 and Trunnions 88 which extend inwardly from two arms 90 at the top of the pusher 92. A plunger 94 is connected to the pusher 92 in a hinge-like manner. This hinge can be reduced by reducing the wall thickness at the connection point% between the plunger 94 and the pusher 92 will. The other end of the plunger 94 is provided with a downwardly extending flange 97, the extends through the opening 60 of the outer housing 16 and the inner housing 18 and with the pear-shaped

% migen peripheral wall 72 of the tubular body 20 cooperates.

It is assumed that in the FIG. 3 shown Position the pump chamber 22 is filled with liquid and the valves 40, 78 and 50 are closed. if If liquid is to be sprayed from the pump chamber 22, the trigger 92 is in pivoted to the left of the drawing, whereby the peripheral wall 72 of the tubular body 20 of the flange 97 is pressed in, as shown in FIG The pressure which is thereby exerted on the liquid contained in the chamber 22 is shown the ball 76 comes into closer contact with its seat 74 and presses the lip 70 at the top of the tubular Body 20 away from the associated extension 38, whereby the outlet valve 40 is opened. The under Pressurized liquid in the pump chamber 22 is now through the opened valve 40 into the cavity 44 and expelled through the outlet passage 46. To

Letting go of the pusher 92 goes into its peripheral wall 72 due to its elastic properties original location back. The outlet valve 40 closes automatically and the negative pressure inside the pump chamber 22 causes the ball 76 to lift from its seat 74. This negative pressure draw liquid from inside the container 14 through suction tube 82 upward into the pump chamber 22 until the peripheral wall 72 is back to its in Fig.3 has assumed the starting position shown. During this process, the liquid that enters the Pump chamber 22 is sucked in, replaced by the air flowing through the open valve 50 into the container 14 can flow in. When the pump chamber 22 is filled, both the check valve 78 close as well as the air inlet valve 50. The location of the individual parts during the transition from the compressed Züsiäild iii ucii Aüsgaiigszusiaiiu lsi shown in Fig. 5. When it is desired to spray more liquid, the lever mechanism is used as often as is actuated and the pumping process is repeated.

Reference is now made to FIG. 9, which shows another embodiment of a hand pump 10a according to the invention. Identical or similar parts are given the same reference numerals as in the previous example, but with the addition "a" . The essential difference between the embodiment according to FIG. 9 and that according to the previous figures is that Outer housing 16a and inner housing 18a consist of one piece and that the nozzle carrier 24a is attached to this unit 16a, 18a adjacent surfaces of the unit 16a, 18a is connected. In all other respects this embodiment corresponds to the previous example.

A slightly modified and preferred training

a hand pump according to the invention is shown in FIG. 10, identical or similar parts again being denoted by the same reference numerals, but with the addition "b". The hand pump 106 is designed so that its parts can be manufactured at low cost and assembled quickly and easily. The ribs 80 of the inlet check valve of FIG. 1 to 8 are omitted because at this point when the tubular body 20 ίο is formed from certain materials, a burr formation occurs which could impair the function of the valve. The projections 806 in the embodiment according to FIG. 10 are intended to prevent the ball 766 from rattling and rolling out of its position and thus an unintentional lifting of the ball from its valve seat occurs when the pump 10b is tilted. The number and height of the protrusions 806 permit flow of the

Liquid on the ball 76i> vuibci iii the runipciikaiii-

mer 226 when the ball 766 is lifted from its seat is

F i g. 11 shows a pump 10c; the essentially that of FIG. I corresponds to 8, but in In this case, the pump is operated by thumb pressure and not by the index and / or middle finger. As As can be seen, the main difference between this pump and the pumps discussed above is the Arrangement of the lever mechanism 26c In the exemplary embodiment according to FIG. 11 is the lever mechanism 26c pivotally attached to the bottom 36c of the outer housing 16c at a point that the nozzle carrier 24c opposite This nozzle carrier 24c is in the illustrated embodiment itself as a nozzle for Squirting out of lotion is formed, but any other nozzle can also be used. With the exception of The type of actuation are training and actuation as well as the mode of operation of the pump 10c the same as those of pumps 10, 10a, 106 and the previous examples.

In addition 7 sheets of drawings

Claims (15)

Patent claims: 1. Hand pump for the promotion of filling material from a container, which serves as a container closure and has a plastic housing which contains a pump chamber, the volume of which by manually the pressure exerted can be changed in a direction deviating from the longitudinal axis of the container, characterized in that a one-piece, known per se, is fixed in the housing (16, 18) elastic pump chamber (22) is arranged, which for the delivery stroke by manually exerted pressure is deformable and, when released, performs the suction stroke by its own elasticity, and that over an inlet valve (78) with the container interior and via an outlet valve (40) with an outlet channel (46) can be brought into connection in the housing (16, 18) 2. Hand pump according to claim 1, characterized in that since "the pump chamber (22) is formed by a substantially tubular body (20). the lower end of which receives the inlet valve (78) and has a smaller diameter than that upper end. 3. Hand pump according to claim 1 or 2, characterized in that the outer wall (72) of the Pump chamber (22) in the idle state together with a sealing seat (48) a seal for the Forms container interior to the outside. 4. Hand pump according to claim 3, characterized in that the sealing seat (48) with the when Delivery stroke deformed area of the outer wall (72) of the pump chamber (22) interacts in such a way that that there is at least one connection during the delivery stroke of the container interior is made with the atmosphere. 5. Hand pump according to claim 3 or 4, characterized in that the sealing seat of a radial inwardly directed annular flange (48) of the housing is formed. 6. Hand pump according to claims 1 and 4, characterized in that the inlet valve (78) in in a manner known per se has a ball (76) with a valve seat (74) at the lower end of the Pump chamber (22) cooperates and in its movement upwards by projections (84) in the Pumpenkanjmer (22) is limited, and that the The valve seat (74) and the ball (76) are arranged in a region of the pump chamber (22) which lies below the sealing seat (48). 7. Hand pump according to one of claims 1 to 6, characterized in that the outlet opening (46) arranged in the upper region of the pump housing (16,18) and in the idle state opposite the Pump chamber (22) is shut off. 8. Hand pump according to claim 7, characterized in that the outlet opening (46) shuts off Wall (70) of the pump chamber (22) is designed so that it is through the during the delivery stroke in the pressure generated in the pump chamber (22) and / or due to the deformation of the pump chamber (22) during the delivery stroke at least in the area of the outlet opening (46) from its opposite surface (3β) is lifted. 9. Hand pump according to claims 7 and 8, characterized in that the upper end of the Pump chamber (22) has an annular sealing lip (70) with a shoulder (38) on the Front wall of the housing cooperates to the To form the outlet valve (40), and that a space (44) directly adjacent to the sealing lip (70) is provided, which is connected to the outlet opening (46) in Connection 10. Hand pump according to one of claims 1 to 9, characterized in that the pump housing (16,18) has at least one opening (60) through which the pump chamber (22) is accessible for the purpose of deformation 11. Hand pump according to claim 10, characterized in that for deforming the pump chamber (22) a pivotable lever (92) attached to the pump housing (16, 18) is provided which is connected via a hinge (96) to a plunger (94) which controls the pivoting movement of the Lever (92) transmits substantially radially on the wall (72) of the pump chamber (22) 12. Hand pump according to claims 10 and 11, characterized in that the opening (6OcJ and the lever (26c) is arranged on the side of the pump housing facing away from the outlet opening are (Fig. 11). 13. Hand pump according to one of claims 1 to 12, characterized in that the pump chamber (22) has a peripheral flange (65) and the housing has two parts (16, 18) which are connected to each other opposite annular surfaces (34; 52, 54) are provided, between which the peripheral flange (65) is kept sealed. 14. Hand pump according to claim 13, characterized in that the flange (65) one after has below extending annular sealing lip (66) with a conical inner surface (68), which in a appropriately designed groove is clamped between the two housing parts (16,18). 15. Hand pump according to one of claims 1 to 14, characterized in that in the pump housing (16, 18) an essentially horizontally extending outlet channel (46) is arranged.