WO1993025318A1

WO1993025318A1 - Cream dispenser

Info

Publication number: WO1993025318A1
Application number: PCT/EP1993/001475
Authority: WO
Inventors: Otto Katz
Original assignee: Otto Katz
Priority date: 1992-06-13
Filing date: 1993-06-10
Publication date: 1993-12-23
Also published as: AU4324893A; DE4219474A1

Abstract

A cream dispenser has a dispensing valve (30) let in flush in a horizontal wipe surface (31) and a lateral handle (4) whose direction of actuation can be deflected into a feeding movement in an angular direction to the direction of actuation. The pressure valve (24) and the dispensing valve (30) can be moved by the feeding pressure and the suction valve (16) can be moved by pressure differentials and by mechanical forces. The reservoir (18) can shrink by the amount of product removed. In order to simplify handling as much as possible and to protect the contents from impurities, a fixed feeding piston (23) linked to a top housing (1) by a shoulder (26) can plunge into a longitudinally movable feeding cylinder (16) which can be pressed (5) by a spring element (9, 12, 13) against transversely movable bevels by means of two cams (8). The pressure valve (24) and the dispensing valve (30, 41) can be actuated into the opening direction by the feeding pressure and the dispensing valve (30, 41) and the pressure valve (24) can be pushed into a closed position by a pressure spring (32, 42).

Description

"Cream dispenser"

The invention relates to a cream dispenser according to the preamble of claim 1.

In a dispenser for pasty masses according to EP 0282791 B1, a device is known in which the elastic lid of a storage container is deformed by means of a side button, the bottom of which is made of a piston which can only be moved in the emptying direction. The elastically deformable lid is coupled to an output valve which is let into a wiping surface and which opens when the lid is deformed and releases the filling material displaced by the deformation to the outside.

It is disadvantageous here that when air or outgassing of the filling material penetrates, the piston cannot be re-tightened due to a lack of negative pressure. It should also be noted that the piston friction does not exceed the existing negative pressure, since then the piston can no longer follow. The ingress of air must therefore be avoided both during filling and in use, since this leads to a functional failure.

Another disadvantage is that the dispenser head and container form a functional unit which has become completely unusable after emptying.

The invention is based on the object of designing a cream dispenser in such a way that simple handling, ie metering and cream removal, and protection against contamination of the content is provided. Air or Gas inclusions in the filling material should not lead to a functional failure, so that an exactly air-free guidance of the filling material is not necessary. Furthermore, the dosing head of the cream dispenser should be separable from the container as an independent structural unit and should accordingly be reusable.

This object is achieved in the cream dispenser according to the invention in that a fixed delivery piston connected to an upper housing by a shoulder can be immersed in a longitudinally movable delivery cylinder which can be applied to transverse inclines by means of two cams by a spring element and that the pressure valve and the dispensing valve can be acted upon in the opening direction and the dispensing valve and the pressure valve can be displaced in the closed position by a compression spring.

This arrangement represents a self-priming dosing head which can be combined with a container to form a cream dispenser via a thread. The container has the property that it reduces its volume according to the filling material removal, which can be done by a movable piston or by a collapsible bag.

In order to reliably protect the contents from contamination, a dispensing valve is provided which only opens when there is pressure and closes when the pressure drops. As a result, a backflow of contaminable contents into the container is avoided.

A simple arrangement is seen in the fact that the control cylinder is integrally formed on the delivery piston and that it serves to receive a sliding and sealing control piston. The pressure which acts on the differential surface between the control piston and the inner diameter of the delivery piston results in the available restoring force for opening the dispensing valve. It is expedient to manufacture the control piston in one piece with the output valve and the bushing. The bush gives the control piston an additional guide and is used to seal against the inside diameter of the delivery piston. The dispensing valve is flush with the scraper surface in order to avoid dead zones in which germs could form.

So that the pumped medium can spread to the pressure chamber and is also available there as a control medium, the bushing has a longitudinal bore into which cross bores open, which establish the connection to the pressure chamber.

Since a firm and tight connection between the delivery piston and the upper housing is required, the control cylinder integrally formed on the delivery piston is provided with a step, onto which a circular attachment connected to the upper housing can be folded.

In order to avoid an undesirable pressure build-up behind the control piston, it is expedient to make relief bores in the flat surface of the control cylinder.

A simple solution is to hold both the compensating valve and the pressure valve in the closed position with the same compression spring. The compression spring rests on the one hand on the sealing lips of the bushing which is connected to the discharge valve - the contact with the sealing lips reinforces their sealing effect and keeps the oil tension constant - on the other hand the compression spring rests on the guide ribs of the pressure valve. The control piston can advantageously be replaced by a control membrane which is connected to the output valve and the bushing. By eliminating the piston fit, fluctuating wall friction is eliminated. The sensitivity is increased and the sealing at the clamping point is particularly reliable.

If a control membrane with an annular bead is sealingly connected to the attachment of the upper housing, this results in a simple design and assembly of the delivery piston, on which a disk is molded, which comes into contact with the attachment under the action of a compression spring.

It is expedient to design the spring element as a spring clip, compression spring, but in particular as a spring rod, in order to achieve a low overall height of the dosing head.

It is advantageous to provide a suction valve in the feed cylinder, which is designed as a cone valve and is longitudinally guided by resilient segments and can be latched into the feed cylinder and stroke-limited * bar. Due to this design and the fact that there is no spring element in the pump chamber, which dead space has been generated, it is possible for the pump chamber to have a volume of zero in the end-operated position of the handle. As a result, an optimal negative pressure is created in the suction phase, which is necessary for sucking in pasty substances.

In a further embodiment of the suction valve and the end face of the delivery piston it is achieved that in the end-operated position of the handle, the end face of the suction valve and its attachment to the end faces of the delivery plunger and the pressure valve built into the delivery plunger form a contact plane and that the attachment of the suction valve, which is able to fill the bore of the delivery plunger from its end face to the end face of the pressure valve, forms a releasable connection opening of the suction valve with the beginning of the suction stroke takes place immediately, without any delay due to adhesive and adhesive forces in the area of the suction valve.

The delivery cylinder, which can be actuated lengthwise by the handle, has a peripheral edge which represents a stroke limitation and an additional seal in the unactuated state, relative to the storage space.

The use of the movable feed cylinder proves to be particularly advantageous, as viewed below. The movement of the delivery cylinder simultaneously results in different ones in the storage room and in the pump room

2 2 Volume change that behaves like D: d.

During a pressure stroke, a space enlargement is created in the storage space, which corresponds to the stroke movement of the feed cylinder. The atmospheric pressure on the follower piston pushes it forward. Was in the pump room

2 2 at the same time conveyed a smaller amount in the ratio d: D. The subsequent suction stroke of the pump space is synonymous with a displacement of filling material in the storage space, since the suction volume created in the pump space is smaller than the displacement volume described by the delivery cylinder. This creates a damming effect in the storage space, which favors the filling of the pump space. This increases the degree of filling, which is of fundamental importance when pumping creamy masses. The displacement difference occurring in the storage space is compensated for by retreating the follower piston.

In a simpler design of the dispensing valve, it is lifted out of the wiping surface when it is opened. During assembly, the valve tappet is pressed into the assembled pressure valve until the valve cone stops in the upper housing.

4 embodiments are explained with reference to the accompanying drawings. Show it:

Fig .1 longitudinal section through the complete cream dispenser with control piston, not actuated

Fig. 2 partial longitudinal section as Fig. 1 actuated

Fig. 3 longitudinal section through dosing head with control membrane

Fig. 4 longitudinal section through dosing head with modified control membrane

Fig. 5 Part 1 looks at the handle / delivery cylinder

Fig. 6 Part 1-sided view handle / delivery cylinder in the spring clip

Fig. 7 top view like Fig. 6

Fig. 8 Part 1 side view of handle / delivery cylinder in the compression spring

Fig. 9 partial top view Fig. 8

Fig. 10 Partial side view of the conveying cylinder / spring rod

Fig. 1 1 On top of Fig. 10 An upper housing 1 is connected to a lower housing 2 such that both parts form a common axis. As shown, these can be circular, but also in different cross-sectional shapes, provided that they do not impair the internal functional parts. The two parts can be held together for example by a click connection, welding or flanging in a known manner. Both parts 1, 2 have a preferably rectangular cutout 3 and 3 a, in which the handle 4 is slidably supported. To match the cutouts 3 and 3a, indexing elements not specified are provided. On the handle 4, which emerges as a rectangular block, two bevels 5 are formed in a fork shape, which merge into a locking surface 6, at the end of which there is a pawl 7. In the unactuated position (FIG. 6), two cams 8 arranged opposite one another lie on the latching surfaces 6 and come into contact with the spring element 9, which is designed as a spring clip. The spring element 9 is fastened in that it is inserted into a recess 10 in the lower housing 2 and, after the upper housing 1 has been put in place, there is a play-free clamping in the recess 10. The ends of the spring element 9 which abut two cams 8 slide in grooves 11 which serve for guiding and securing against rotation.

Instead of the spring clip 9, a compression spring 12 is used in FIG. 4, whereby on the one hand a resilient support on the feed cylinder 16 can be achieved, and on the other hand a disk 38 is brought into contact with a shoulder 26. Another variant of the spring element 13 is in the form of a spring rod (FIGS. 10, 11) which is mounted in two cutouts 14 in the lower housing 2a and is axially secured by the upper housing 1a. A delivery cylinder 16 is guided in a bore 15 of the lower housing 2 and can be moved longitudinally on the one hand by the spring element 9 and on the other hand by means of the handle 4 on the bevel 5. A peripheral edge 17 serves as a stop and as an additional seal on the lower housing 1 in the unactuated state. Above the peripheral edge 17, which is designed as a flange, said cams 8 are formed, which are arranged symmetrically to the axis of the handle 4 and under the effect of the Spring element 9 on the locking surface 6, or in the actuated state, come to rest on the bevels 5. In the feed cylinder 16 there is a suction side directed towards the storage chamber 18. A suction valve 19 is longitudinally guided in the feed cylinder 16 by means of resilient segments 20, at the end of which stops for limiting the stroke are attached. An extension 21 adjoins the valve plate of the suction valve 19, which is preferably conical and has its counterpart in a bore 22 of a delivery piston 23. The coordination of the fit between attachment 21 and bore 22 results in a releasable mechanical connection which is simplified in terms of production technology in that the delivery piston 23 consists of flexible material. The delivery piston 23 has sealing lips on its side facing the suction valve 19. The pressure valve 24, which is shown as a cone valve with guide ribs, is located on this side. A control cylinder 25 is integrally formed on the delivery piston 23 and is sealingly connected to the upper housing 1 at a shoulder 26 by flanging or welding. In the control cylinder 25 there is a longitudinally movable control piston 28, which is sealed on the inner wall of the control cylinder. The output valve 30 is connected to the control piston 28, which in a conical bore tapering outwards under the action of the compression spring 32 on the upper housing 1 lo

Facility is coming. The end face of the dispensing valve 30 is flush with the wiping surface 31. A bushing 33 is integrally formed on the inside of the control piston 27, which is sealed and slidably mounted in the delivery piston 23. A bore 34 forms with transverse bores 35 the connection to a pressure chamber 36. Relief bores 37 prevent pressure build-up on the rear of the control piston 28. The compression spring 32 rests on the one hand on the bush 33, the stop of which is formed by the closed dispensing valve 30, on the other hand the compression spring 32 is supported on the pressure valve 24, the closed position of which is supported thereby. In another embodiment (FIG. 3), the control piston is replaced by a control membrane 29, which is molded onto the bush 33 and is capable of oscillating about a tight clamping point 27. The clamping point is formed from an annular surface of the upper housing 1a and the control cylinder 25a. The pressure chamber 36a is formed between the upper housing 1a and the control membrane 29. According to Figure 4, the delivery piston 23b is designed with a disc 38, without a control cylinder. The pressure chamber 36b * is formed by a partial surface of the upper housing 1b and a control membrane 29a. The disk 38 with relief bores 37 is formed on the delivery piston 23b and comes into contact with the shoulder 26 by the compression spring 12. The latter is supported on its opposite side on the feed cylinder 16.

12 shows an upper housing 1c, to which a delivery piston 23c is connected to a shoulder 26 by flanging or welding. A valve tappet 40, which is integrally formed on a valve cone 41 which is let into the upper housing 1c at the upper end, is joined inseparably to the pressure valve 24, the guide ribs of which produce a clamping connection which is supported by interlocking circumferential grooves in the clamping area. So that the sealing of the pressure valve 24 and the valve cone 41 takes place at the same time, the valve tappet 40 is pressed into the assembled pressure valve 24 which is in the closed position until the valve cone 41 stops in the upper housing 1c. With the pressure-dependent opening of the pressure valve 24, the valve cone 41 opens at the same time. The closing force of the pressure valve 24 and valve cone 41 is determined by the pressure spring 42, which rests on the one hand on the upper housing 1c and on the other hand on the pressure valve 24.

In FIG. 14, a valve nipple 43 is inserted into the wiping surface 31 of the upper housing 1c, which is held in the closed position by a spring washer 44. The spring washer 44 is snapped into the valve nipple 43 by an undercut 45. The spring washer 44 is clamped on its outer diameter between the upper housing 1c and the delivery piston 23c. For the compression spring 42, the spring washer 44 serves on the one hand as an abutment, and on the other hand the compression spring 42 holds the pressure valve 24 in the closed position. The opening of the valve nipple 43 is pressure-dependent.

The function of the cream dispenser according to Fig. 1 and 2 is as follows:

When the handle 4 is actuated, the delivery cylinder 16 executes a pressure stroke against the prestressing force of the spring element 9 by means of the bevels 5 resting on the cams 8 (FIG. 2) the area of the bore 34, Querboh¬ tion 35 and pressure chamber 36 passed. By acting on the control piston 28, the latter is displaced against the prestressing force of the compression spring 32, the dispensing valve 30 opening and the filling material being able to escape to the outside. If the handle 4 is relieved, the movement of the feed cylinder 16 under the action of the spring element 9 reverses into a suction stroke. Due to the associated pressure drop in the filling material, the dispensing valve 30 closes. Before the start of the aforementioned suction stroke, the suction valve 19 is releasably coupled with its attachment 21 to the delivery piston 23. With the beginning of the suction stroke, the feed cylinder 16 moves in the direction of the storage space 18, the suction valve 19 remaining in connection with the feed piston for as long, i.e. opens until the pawls 20a strike the feed cylinder 16 and from this point the suction valve 19 in the fully open position with the feed cylinder 16 passes through the suction stroke. The suction valve 19 is thus brought to the full open position at the start of the suction stroke, unaffected by adhesive and adhesive forces, which is a condition for good suction behavior. When sucking in, the pump chamber 39 has a smaller one

Volume represents as the feed cylinder 16 (the ratio

2 2 corresponds to d: D) displaced in the storage room 18.

The resulting jam in the filling material supports the

Filling process and moves the follower piston 48 around Difference quantity back. In the case of repeated pressure strokes, ie actuation of the handle 4, the increase in space which arises in the storage space is compensated for by the delivery cylinder 16 moving outwards by an advancement of the follower piston 48.

Claims

1. Cream dispenser, with a dispensing valve (30) recessed flush in a horizontal wiping surface (31), with a side handle (4), the actuating direction of which can be deflected into an angularly arranged conveying movement, its pressure valve (24) and dispensing valve ¬ til (30) by the delivery pressure, and its suction valve (16) can be moved by pressure drop and by mechanical forces and its storage space 18 can be reduced by the amount of product removed, characterized in that a fixed, with egg top housing (1) by a The shoulder (26) of the connected delivery piston (23) can be immersed in a longitudinally movable delivery cylinder (16), which by means of two cams (8) through a spring element (9, 12, 13) on transversely movable bevels (5) can be applied and that the delivery valve (24) and the discharge valve (30, 41) can be acted upon by the delivery pressure, and the discharge valve (30, 41) and the pressure valve ( 24) is displaceable in the closed position.

2. Cream dispenser according to claim 1, characterized in that the inner wall of a control cylinder 25 serves to receive a slidable and sealable control piston (28).

3. Cream dispenser according to claim 1 and 2, characterized in that the control piston (28) can be acted upon by the delivery medium in a pressure chamber (26) and is connected to the dispensing valve (30) and a bushing (33) which is in the delivery piston (23) is axially movable and seals on its outer diameter and that the dispensing valve (30) is flush with a wiping surface (31).

4. Cream dispenser according to claim 2, characterized in that the bushing (33) has a bore (34) which is connected to transverse bores (35) and to a pressure chamber (36).

5. Cream dispenser according to claim 1, characterized in that the control cylinder (25) integrally formed on the delivery piston (23) is connected to the upper housing (1) in a sealing manner by a deformation with the upper housing (1) by its deformation (26).

6. Cream dispenser according to claim 2, characterized in that relief holes are provided on the flat surface of the control cylinder (25).

7. Cream dispenser according to claims 1 and 2, characterized in that the compression spring (32) on the one hand on the sealing lip of the socket (33), on the other hand comes to rest on the guide ribs of the pressure valve (24).

8. Cream dispenser according to claim 1, characterized in that a control membrane (29) with the dispensing valve (30) and the socket (33) connected to a pressure chamber (36 a) can be acted upon.

9. Cream dispenser according to claim 8, characterized in that the control membrane (29) with the output valve (30) and the socket (33) to a sealing clamping point (27) is oscillatable, which by an annular support in the upper housing (1a) and an annular shoulder is formed in the control cylinder (25a).

10. Cream dispenser according to claim 1, characterized in that the annular bead located on the outer diameter of a control membrane (29a) is sealed by the shoulder (26), on which a, on the delivery piston (23b) molded disc (38) under the action of the spring element ( 12) comes to the plant.

11. Cream dispenser according to claim 1, characterized in that the spring elements (9, 12, 13) are configured analogously as a spring clip, compression spring, spring rod.

12. Cream dispenser according to claim 11, characterized in that the spring element (12) formed as a spring clip in a recess (10) of the lower housing (2) can be inserted and fixed by plugging the upper housing (1) without play.

13. Cream dispenser according to claim 11, characterized in that the spring element (13) is designed as a spring rod, can be inserted into a slot-shaped recess (14) of the lower housing (2a) and can be clamped by assigned ribs in the upper housing (Va).

14. Cream dispenser according to claim 1, characterized in that the suction valve (19) is guided longitudinally by resilient segments (20) and can be latched and stroke-limited via pawls (20a) in the feed cylinder (16).

15. Cream dispenser according to claim 1, characterized in that in the end-actuated position of the handle (4) a pump chamber (39) has a volume of zero.

16. Cream dispenser according to claim 15, characterized in that in the end-actuated position of the handle (4) the end face of the suction valve (19) and extension (21) with the end faces of the delivery piston (23) and pressure valve (24) Form contact level.

17. Cream dispenser according to claim 15, characterized in that in the end-actuated position of the handle (4), the extension (21) of the suction valve (19) with the bore (22) of the delivery piston (23) forms a releasable connection.

18. Cream dispenser according to claim 1, characterized in that the peripheral edge (17) located on the conveying cylinder (16) represents a stroke limitation and an additional seal with respect to the storage space (18) in the unactuated state.

19th Cream dispenser according to claim 1, characterized in that the volume changes in the pressure stroke of the delivery cylinder (16)

Storage room (18) relate to those in the pump room (39)

2 2 like D: d

20. Cream dispenser according to claim 1, characterized in that the valve tappet (40) in the assembled pressure valve (24) up to the stop of the valve cone (41) in the upper housing (1c) can be pressed.

21. Cream dispenser according to claim 20, characterized in that the compression spring (42) determines the closing pressure of the pressure valve (24) and the valve cone (4J).

22. Cream dispenser according to claim 1, characterized in that a valve nipple (43) through a, on an undercut (45) engages spring washer (44) for resilient contact in the upper housing (1c).

23. Cream dispenser according to claims 1 to 22, characterized in that the complete dosing head by means of thread (46) can be repeatedly combined with a cream container.

24. Cream dispenser according to claims 1 to 23, characterized in that the container (47) contains a follower piston 48 movable in both directions

25. Cream dispenser according to claims 1 to 23, characterized in that the container (47) contains a collapsible storage bag.