DE9218204U1 - Bottle dispenser - Google Patents

Description

93-0531 Z/sch 14 July 1993

Walu-Apparatetechnik GmbH

Lange Strasse 18 97877 Wertheim-Grünenwört

Bottle dispenser

The innovation relates to a bottle dispenser according to the preamble of claim 1.

Such a bottle dispenser is known from DE-PS 23 43 687. It consists of a cylinder, preferably a glass cylinder, with a counter stop and a piston unit with a piston guided longitudinally in the cylinder and a cylinder sleeve which spans the cylinder and has a longitudinal slot in which a stop body provided with a stop is guided so that it can be moved and locked. The cylinder sleeve has a toothed strip in the area of the longitudinal slot. The stop body has at least one tooth which can be brought into and out of engagement with the toothed strip. When the tooth is brought out of engagement, the stop body can be moved in the longitudinal slot. The stop body is then locked again at another point in the longitudinal slot by the tooth engaging in the toothed strip. The stop provided on the stop body works with

the counter stop provided on the cylinder to limit the stroke of the piston and thus for dosing.

A bottle dispenser of the type mentioned above is also known from DE-PS 38 14 076.

The operational safety of the existing bottle dispensers needs to be improved, especially when working with dangerous liquids, such as corrosive or toxic ones.

The aim of the innovation is to improve the operational reliability of a bottle dispenser of the type described above.

According to a first proposal, this task is solved by the characterizing features of claim 1. In order to improve operational safety, the bottle dispenser has a return line branching off downstream from the pressure valve, through which the liquid sucked in can be returned to the container. This can prevent the liquid to be dosed from being discharged to an extent that is not actually necessary, which in turn avoids the associated risks. When the bottle dispenser is first connected to a container, for example a full bottle, there is generally still air in the lines and channels and in the cylinder of the bottle dispenser. In order to enable precise dosing, this air must be completely removed. This is done by performing a few piston strokes and collecting the liquid that comes out of the dispenser in a separate container. The piston strokes are carried out until no more air is being pumped out. Only then is the dispenser ready for use. The fact that the liquid must first be collected in a separate container creates additional work. Furthermore, this brings additional risks with dangerous liquids.

The return line prevents this. During the pumping out of liquid from a liquid container that is being used for the first time, which is still necessary, the return line is activated so that the liquid that has been sucked in is returned to the container. Only when no more air is being pumped out is the return line deactivated so that liquid can be dispensed from the dispenser, which is then ready for use. In addition to reducing risks and effort, this also results in more economical operation.

Advantageous further developments are described in the subclaims.

The return line can be detachably connected to the pressure line. First, the return line is connected to the pressure line until the bottle dispenser is ready for operation in the manner described above. The return line is then detached from the pressure line.

According to a further advantageous development, the return line can be opened and closed using a valve. First, the return line is opened until the bottle dispenser is ready for operation in the manner described above. The return line is then closed.

Preferably, the valve can be brought into a first position in which the pressure line is open and the return line is closed, and into a second position in which the pressure line is closed and the return line is open. In the first position, the flow passes through the pressure line; liquid can be dosed and dispensed. In the second position, the pressure line is shut off and the flow passes through the controlled return line.

The valve can consist of a rotatable valve body with a

pressure channel opening the pressure line and a return channel opening the return line.

A further advantageous development is characterized in that the valve has a longitudinally displaceable, preferably spring-loaded valve body.

The above-mentioned object is achieved according to a second proposal, for which independent protection is claimed, by the characterizing features of claim 6. According to the invention, a valve is provided in the pressure line, which can be brought into a first position in which the pressure line is open, and which can be brought into a second position in which the pressure line is closed. The fact that the pressure line can be closed improves operational reliability.

Advantageous further developments are described in the further subclaims.

An advantageous further development is characterized in that the valve locks the piston in its second position, which closes the pressure line. In this locking position, the piston cannot be moved. It is not possible to suck in or release liquid. This eliminates malfunctions that could cause danger. If the pressure line is closed, suction of liquid is prevented.

The valve may consist of a rotatable valve body.

According to a further advantageous development, the valve has an actuating button or rotary knob on which a projection is provided which, in the second position of the valve, which closes the pressure line, overlaps a shoulder connected to the piston. This prevents movement of the piston.

Preferably, a part that extends over the cylinder, preferably a cylinder sleeve, is connected to the piston and on which the shoulder is arranged. The shoulder can be designed as a shoulder ring provided at the lower end of the cylinder sleeve. In this design, the rotational position of the piston or the cylinder sleeve connected to it is not important.

According to a further advantageous development, the rotatable valve body is provided with an external toothing which engages in a toothing provided on an actuating ring. The actuating ring can be rotatably mounted on the housing or on a support ring connected to the housing.

The valve can have a longitudinally displaceable, preferably spring-loaded valve body.

A further advantageous development is characterized in that the valve is provided in a valve housing which can be detachably connected to the housing, in particular can be plugged onto the housing and removed from the housing. This prevents the valve housing from being accidentally detached from the housing, which would result in the liquid escaping uncontrollably. The valve housing can preferably be detachably connected to the housing by means of a barb snap connection.

The second solution just described can be combined with the first solution described above.

The above-mentioned task is solved according to a third proposal, for which protection is also claimed independently, by the characterizing features of claim 17. A support ring in which the pressure line runs is rotatably mounted in the housing. This makes it possible to pivot the pressure line around the longitudinal axis of the housing, which also improves operational reliability.

This third solution proposal can also be combined with the first and/or second solution proposal.

According to a fourth proposal, for which protection is also claimed independently, the above-mentioned object is solved by the characterizing features of claim 19. According to the invention, a protective cap is provided which surrounds the outflow line and which can be brought into a first position in which it exposes the outflow opening and which can be brought into a second position in which it covers the outflow opening. Depending on requirements, the outflow opening is thus exposed for the discharge of liquid or covered for safety reasons.

Advantageous further developments are described in the further subclaims.

A valve for opening and closing the pressure line can be provided in the pressure line. The protective cap is preferably in its first position, which exposes the discharge opening, when the valve is open, and in its second position, which covers the discharge opening, when the valve is closed. This automatically ensures that the protective cap does not interfere when liquid is dispensed when the valve is open, and that the protective cap covers the discharge opening protectively when no liquid is dispensed when the valve is closed. This reduces the risk of injury; the discharge opening cannot be touched, even accidentally.

The protective cap can be rotated about an axis. The protective cap rotation axis preferably runs perpendicular to the cylinder's longitudinal axis.

A further advantageous development is characterized by a rotary knob, by means of which the protective cap can be brought into its two positions or rotated. The rotary knob can

Have a screw surface into which a nose provided on the protective cap engages to rotate the protective cap. It is particularly advantageous if the rotary knob is connected to the valve for opening and closing the pressure line.

The fourth solution just described can be combined with the first, second and/or third solution.

Examples of the innovation are explained in detail below using the attached drawing. In the drawing shows

Fig. 1 a bottle dispenser in a front view,

Fig. 2 the bottle dispenser shown in Fig. 1 in a view from above,

Fig. 3 the stop body shown in Fig. 1 of the

Bottle dispenser in an enlarged view from the front,

Fig. 4 the bottle dispenser shown in Fig. 3 in a view from above,

Fig. 5 shows the bottle dispenser shown in Fig. 1 in a sectional view,

Fig. 6 shows the bottle dispenser shown in Figures 1 to 5 in a sectional view corresponding to Fig. 2,

Fig. 7 shows the bottle dispenser in a side view corresponding to Fig. 1, with the rotary knob in a different position,

Fig. 8 the bottle dispenser shown in Fig. 7 in a view from above,

Fig. 9 the bottle dispenser in a further side view corresponding to Fig. 7,

Fig. 10 the bottle dispenser of Fig. 9 in a sectional view from above along the line X-X in Fig. 9,

Fig. 11 the bottle dispenser in a side view with a further modified position of the rotary knob and with the protective cap lowered,

Fig. 12 the bottle dispenser shown in Fig. 11 in a view from above,

Fig. 13 shows a second embodiment of a bottle dispenser in a sectional view corresponding to Fig. 5,

Fig. 14 shows the bottle dispenser shown in Fig. 13 in a sectional view corresponding to Fig. 6,

Fig. 15 shows a third embodiment of a bottle dispenser in a sectional view corresponding to Figs. 5 and 13,

Fig. 16 shows the bottle dispenser shown in Fig. 15 in a sectional view corresponding to Figs. 6 and 14,

Fig. 17 shows a modification of the valve in a sectional view, with the valve in the pressure line opening position,

Fig. 18 the valve shown in Fig. 17 in the position opening the return line,

Fig. 19 another embodiment of a valve in

a sectional view in the return line opening position,

Fig. 20 shows a further embodiment of a valve in a sectional view in the pressure line opening position and

Fig. 21 another embodiment of a valve in

a sectional view in the return line opening position.

The bottle dispenser shown in Figures 1 and 2 for sucking in and dispensing liquid has a housing 1 that can be connected, for example screwed, to the opening of a bottle.

As can be seen in particular from Figures 5 and 6, the housing 1 has an internal thread 2 on its underside for screwing to the opening of a bottle. In the housing 1 there is an insert 3, on the top of which there is a cylindrical recess in which a cylinder 4 is fastened. The cylinder is surrounded by a protective casing 5 made of plastic, the lower end of which is clamped between the housing 1 and the insert 3 and thus fastened. At its upper end, the protective casing 5 is connected to a counter-stop 6, which is designed as a stop ring and whose lower end surface 7 acts as a counter-stop. The counter-stop 6 is connected to the upper end of the protective casing 5 by a thread. This allows the height of the counter-stop 6 to be changed; the height of this counter-stop 6 is therefore changeable or adjustable.

The dispenser also has a piston unit 9, which consists of a

in the cylinder 4, a piston 10 guided longitudinally and a cylinder sleeve 11 that spans the cylinder 4 and its protective casing 5. The piston 10 is connected to the cylinder sleeve 11 via a cap 13. The piston 10 only rests at its lower end on the inner casing of the cylinder 4; there is a corresponding ring seal 14 arranged. In the remaining area, the outer diameter of the piston 10 is smaller than the inner diameter of the cylinder 4.

The cylinder sleeve 11 has a longitudinal slot 12 (Fig. 1) in which a stop body 15 is guided so that it can be moved longitudinally and locked. The stop body 15 is provided with a stop 16 which is designed as a stop ring coaxial with the cylinder's longitudinal axis 17. However, the stop 16 could also be designed as a ring segment that is also coaxial with the cylinder's longitudinal axis 17. The upper flat end surface 18 of the stop 16 rests against the lower end surface 7 of the counter stop 6 in the upper end position of the piston unit 9. This limits the stroke of the piston 10 upwards and enables dosing. The stroke of the piston 10 downwards is limited by the fact that the lower end surface 19 of the piston 10 rests against the bottom surface of the recess provided in the insert 3 of the housing 1.

The cylinder sleeve 11 has a toothed strip 20 in the area of the longitudinal slot 12, which is arranged pointing into the longitudinal slot 12. The toothed strip 20 is therefore arranged on a side of the longitudinal slot 12 that faces the opposite side of the longitudinal slot 12. As a result, the toothed strip 20 is located in the "inside" of the longitudinal slot 12. The teeth of the toothed strip 20 are opposite the opposite side of the longitudinal slot 12; they point there. On the side of the longitudinal slot opposite the toothed strip 20, a guide surface 21 is provided, which runs at a distance and parallel to the toothed strip 20.

The stop body 15 has a tooth that can be brought into and out of engagement with the toothed strip 20. In Fig. 4, this tooth is covered by the tooth of the toothed strip 20 that is located directly above it.

The stop has two support ribs 22 that protrude inwards from the inner surface 23 of the stop 16 and are approximately semicircular in cross-section. The support ribs 22 rest on the protective casing 5 surrounding the cylinder 4. This allows the stop 16 to be supported particularly well on the protective casing 5 and thus on the cylinder 4. The support ribs 22 are arranged parallel to one another and at a distance from one another, namely symmetrically to the longitudinal slot 12 or its central axis 24.

The stop body 15 also has a total of 4 arms 25, 26, 27, 28 pointing away from the cylinder’s longitudinal axis 17. Two arms 25, 26 and 27, 28 are opposite each other at the same height. Furthermore, two arms 25, 27 and 26, 28 are arranged one above the other. All arms 25, 26, 27, 28 therefore form a rectangle when viewed from the front (Fig. 3). The two upper arms 25 and 26 are spaced apart from each other and arranged essentially parallel to each other; the same applies to the two lower arms 27, 28. The arms 25, 26, 27, 28 protrude outwards through the longitudinal slot 12. The tooth engaging in the toothed rack 20 is arranged on the arm 25, specifically on the outside of this arm 25. A tooth can also be arranged on the arm 27 located underneath.

A handle 29, 30 is attached to each of two arms 25, 27 and 26, 28 lying one above the other. The outer sides of the handles are rounded. The handle 29 is connected to the arm 25 and possibly also to the arm 27 in a locking manner by means of a shoulder 31 at the end of an inclined surface 32. At the upper end of the stop body 15 there is a pointer 33 by means of which the set stroke volume can be indicated using a scale 34.

-12-(Fig. 1) can be read.

The stop 16 can be adjusted in a simple manner by pressing the handles 29, 30 together. This also presses the arms 25 to 28 together so that the tooth provided on the arm 25 comes out of engagement with the toothed strip 20. The stop body 15 can then be moved up or down to the desired position. The handles 29, 30 are then released again so that the tooth on the arm 25 engages with the toothed strip 20 again, in a different position. The upper end surface 18 of the stop 16 is then at a different height, which is indicated by the pointer 33 on the scale 34. The stroke of the piston 10 also changes accordingly.

As can be seen from Fig. 5, in the housing 1, which can be made of polypropylene, or more precisely in the insert 3, which can be made of Teflon, there is an intake line 41 leading to the cylinder 4, in which the intake valve 42 is located, as well as a pressure line 43 in which the pressure valve 44 is located. Downstream, i.e. to the right in Fig. 5, from the pressure valve 44, a return line 45 branches off from the pressure line 43, which can be opened and closed by a valve 46. When the valve 46 is opened, the liquid flows through the pressure line 43, the pressure valve 44, the channels in the valve 46 and the return line 45 during the discharge stroke of the piston 10. The liquid passes from there into the annular space 47 surrounding the suction line 41 inside the housing 1, from where it returns to the container, the opening of which is screwed to the thread 2 of the housing 1. The valve 46 consists of a rotatable valve body 48, which is rotatably mounted in a valve block 49. The valve block 49 is connected to a valve housing 50. The rotatable valve body 48 is connected at its upper end to a rotary knob 51, which consists of a rotary handle and a base plate 53. The base plate 53 has a downward-pointing extension with an annular groove 54, with which

it engages in a corresponding hole on the top of the housing 50. The step located below the groove 54 secures the base plate 53 and thus the rotary knob 51 and the rotatable valve body 48 connected to it against being pulled off .

In the position shown in Figures 5 and 6, the rotatable valve body 48 is in its rotary position opening the pressure line. The pressure channel 55, which passes straight through the valve body 48, connects the pressure line 43 to the discharge line 56.

If the valve body 48 is rotated 90° clockwise from the position shown in Fig. 6, the pressure line 43 is closed and the return line 45 is opened. The connection between the pressure line 43 and the discharge line 56 is thus interrupted and a connection is established between the pressure line 43 and the return line 45. This takes place via the channel 56, the vertical channel 58 running through the valve body rotation axis 57 and the horizontal channel 59 at the lower end of the vertical channel 58, which runs parallel to the channel 56 below it and opens into the return line 45. The channels 56, 58 and 59 form the return channel in the valve body 48. Above and below the channels, the valve body has a ring seal that seals it off from the valve block.

If the valve body 48 is rotated by 45° or an integer multiple thereof, all lines are closed. Then both the pressure line 43 is closed, since its connection to the discharge line 56 is interrupted, and the return line 45 is closed, since its connection to the channel 59 is closed. In this position of the valve body 48 and thus of the valve 46, the piston 10 is also locked. As shown in Figures 1 and 2, in this position a projection 60 provided on the base plate 53 of the rotary knob 51 overlaps the

Shoulder 61, which is designed as a shoulder ring at the lower end of the cylinder sleeve 11 connected to the piston 10, regardless of the rotational position of the cylinder sleeve 11. In the locking position of the rotary knob 51 shown in Figures 1 and 2, movement of the cylinder sleeve 11 and thus also of the piston 10 is not possible.

The valve housing 50 can be detachably connected to the housing 1 by means of a barb snap connection. This barb snap connection consists of two longitudinal grooves 62 provided in the housing 1, into which correspondingly designed barbs engage at the end of the valve housing 50 shown on the left in Fig. 6. The barbs each consist of an inclined surface and an adjoining projection that engages behind a corresponding flank of the groove 62. When the connection is made, the projections cause the ends of the housing 50 to be moved inwards towards one another until, after reaching the end position shown in Fig. 6, they lock into the grooves 62 through the projections. The barbs are located at the end of a leaf spring-like part 63 (Fig. 7), which is delimited at the top and bottom by slots 64 and is formed by these slots 64.

The pressure valve 44 is located in a valve nozzle 65 that protrudes from the housing 1 transversely to the cylinder's longitudinal axis 17. Below the valve nozzle 65 for the pressure valve 44 is the return nozzle 66, which also protrudes from the housing 1. There are corresponding holes in the valve block 49 of the valve housing 50 that accommodate the valve nozzle 65 protruding from the housing 1 and the return nozzle 66 that also protrudes from the housing 1. This means that the valve housing 50 can only be pulled off the housing 1 transversely (to the right in Fig. 5). Since it is secured against being pulled off in this direction by the barbed snap connection 62, it is guaranteed that the valve housing 50 cannot be accidentally separated from the housing 1.

At the front end of the valve housing 50 shown on the right in Fig. 5, a protective cap 67 is provided which overlaps the end 68 of the outflow line 56 which runs downwards at a right angle. The protective cap 67 can be rotated about an axis 69 running transversely to the cylinder's longitudinal axis 17. For this purpose, two cylindrical projections 70 are provided inside the housing 50 which engage in corresponding holes on the outside of the protective cap 67. At the end facing the valve housing 50, the protective cap 67 has a nose 71 which engages in a screw surface 72 provided on the rotary knob 51. By rotating the rotary knob 51, the nose 71 is moved in the vertical direction, causing the protective cap 67 to rotate about its axis of rotation 69. The protective cap is designed as a two-armed lever which can be rotated about the axis of rotation 69. At the end of the lever arm 73 shown on the left in Fig. 5 there is the nose 71 engaging in the screw surface 72, at the other end there is the part 74 of the protective cap 67 which overlaps the end 68 of the outflow line 65. The rotation of the protective cap 67 is caused by the rotary knob 51 which also causes the rotation of the valve body 48. The nose 71 acts as a driving pin.

In the position shown in Figures 5, 7 and 9, the outflow opening 75 at the end of the outflow line 56 is exposed by the protective cap 67. In this position, the lower end 76 of the protective cap 67 is located above the outflow opening 75. The lower end of the outflow line 56 therefore protrudes beyond the protective cap 67.

By rotating the protective cap 67 about its axis of rotation 69, the position shown in Figures 1 and 11 can be achieved. In this position, the protective cap 67 covers the outflow opening 75. In this position, accidental contact with the outflow opening 75 is not possible.

The rotary handle 52 of the rotary knob 51 is arrow-shaped in plan view.

shaped, with the arrow indicating the direction of flow. In the position shown in Figures 8 and 10, the arrow points to the outflow opening 75. The valve 46 is in the position that opens the pressure line 43, in which a connection is established between the pressure line 43 and the outflow line 56, so that liquid can flow out of the dispenser. The piston is not locked. The protective cap 67 is in its upper position that exposes the outflow opening 75.

In the position shown in Fig. 12, the pressure line 43 is shut off. The return flow line 45 is open. The position shown in Fig. 12 is selected when the dispenser is connected to a container for the first time, i.e. when the air must be removed from the channel system by pumping several times. In this position, the protective cap 67 covers the outlet opening 75 (Fig. 11).

The locking position of the rotary knob 51 is shown in Figs. 1 and 2. The piston 10 is locked. Suction or expulsion of liquid is not possible. All channels are closed. The protective cap 67 covers the outlet opening 75.

Fig. 13 and 14 show a second embodiment of a bottle dispenser, in which identical parts are provided with identical reference numerals. In this embodiment, no valve is provided in the pressure line 43. The return line 45 consists of a flexible hose, which is partially rolled up in a spiral shape, so that its length can be easily changed. The end of the return line 43 is attached to a pipe extension 81, which is connected to a funnel-shaped extension pipe 83 82. The pipe extension 81 opens into the extension pipe 83 at a right angle. The extension pipe 83 is provided with an oval handle 84 at its end opposite the funnel-shaped end 82. The protective cap 67 also has a downward-pointing extension 85 on its underside, onto which the extension pipe 83 can be attached in the manner shown in Fig.

-17-13 can be attached as shown.

If the return line 45 is to be activated, the plug-in pipe 83 is pulled off the attachment 85 and plugged onto the outlet opening 75 of the outlet line 56 connected to the pressure line 43. The plug-in pipe 83 is then in the position shown in dash-dotted lines in Fig. 13. If the return line 45 is to be deactivated again, the plug-in pipe 83 is pulled off the outlet opening 75 and plugged onto the attachment 85.

A support ring 86 is rotatably mounted in the housing 1. In the area of the lower end of the support ring 86, a circumferential groove 87 is provided in its outer circumference, into which a corresponding projection of the housing 1 engages. Below this projection, a groove 88 is provided in the housing 1, into which the lower, projecting end of the support ring 86 engages. In order to enable the lower end of the support ring 86 to snap into the housing, a wedge-shaped or conical inclined surface is provided at the upper end of the housing. The support ring 86 is thus connected to the housing in a rotatable and axially immovable manner. The axis of rotation of the support ring 86 coincides with the longitudinal axis of the housing 1; the support ring 86 can therefore be rotated coaxially to the housing 1.

The pressure line 43 runs through the support ring 86. More precisely, the valve nozzle 65 passes through the support ring 86. In this way, the valve nozzle 65 and with it the pressure line 43 and the discharge line 56 can be rotated around the longitudinal axis of the housing 1, namely by 360°, i.e. into any position.

Fig. 15 and 16 show a third embodiment. In this embodiment too, a support ring 86, in which the pressure line 43 runs, is rotatably mounted in the housing 1. Furthermore, as in the first embodiment, a

Valve 46 is provided. In contrast to Figs. 5 and 6, however, the valve 46 does not have a rotary knob 51. Instead, the valve 46, which has a rotatable valve body 48, is connected at its upper end in a rotationally fixed manner to a gear 90, which is provided with an external toothing 91 on its outer circumference. The gear 90 is covered by a bent portion of the protective cap 67. The external toothing 91 engages in a toothing 92, which is provided on the outer surface of an actuating ring 93 and which extends over an angular range of approximately 90° in the manner shown in Fig. 16. The actuating ring 93 is mounted in a groove of the support ring 86 so that it can rotate and cannot move axially. The actuating ring is also grooved on its outer surface. By rotating the actuating ring 93, the rotatable valve body 48 of the valve 46 is rotated via the teeth 92, the external teeth 91 and the tooth edge 90.

A modification of the valve 46 is shown in Figs. 17 and 18. The pressure valve, consisting of a pressure valve spring 106, a pressure valve ball 107 and a pressure valve bushing 108, as well as the valve 46 are housed in the valve housing 103. The valve 46 has a rotatable valve body (tap plug) 102 with a through-bore 111 and a return flow channel 110. A rotary knob (handle) 101 is connected to the rotatable valve body 102.

In Fig. 17, the rotatable valve body 102 is in the position opening the pressure line. The through hole is aligned with the hole of the pressure valve and the pressure line 43. When the rotatable valve body is rotated by 90° into the position shown in Fig. 18, the through hole 111 is disengaged. It is now perpendicular to the longitudinal axis of the valve housing 103. The hole of the pressure valve is then connected to the upper end of the return flow channel 110. The lower end of the return flow channel 110 is connected to the return flow connection 104. The return flow channel 110 is located on the outer

lateral surface of the rotatable valve body 102. It runs along a surface line.

A threaded sleeve 105 is connected to the valve housing 103 coaxially to the pressure valve.

A further modification of the valve is shown in Fig. 19. The parts that correspond to the valve shown in Figs. 17 and 18 are provided with the same reference numerals. In the valve according to Fig. 19, both the pressure valve and the valve are arranged in the valve housing 101.

A transverse bore 124 branches off downwards at a right angle from the bore of the pressure valve. A discharge bore 120 forming the pressure line is aligned with the bore of the pressure valve. A transverse bore 123 also branches off downwards at a right angle from this discharge bore 120.

The valve housing 101 consists of a part with a larger diameter, shown on the left in the drawing, and an adjoining part with a smaller diameter, shown on the right in the drawing. An adjusting ring 112 rests on the shoulder formed between these two parts of the valve housing 101 and is mounted so that it can rotate around the part of the valve housing 101 with a smaller diameter. An external thread is provided on the part of the valve housing 101 with a smaller diameter, onto which a locking nut 117 is screwed, which presses a disk spring 113 against the adjusting ring 112. The locking nut 117 can be used to clamp the adjusting ring. This can also be used to adjust the force with which the adjusting ring 112 must be moved.

An overflow channel 121 is provided in the inner surface (bore) of the adjusting ring 112. Furthermore, a return flow channel 125 is provided in the inner surface of the adjusting ring 112, which is offset by 180° from the overflow channel 121. In the embodiment shown in Fig. 19

In the position shown, the return flow channel 125 is engaged. It establishes the connection between the transverse bore 124 and the return flow bore 122.

When the adjusting ring 112 is rotated by 180°, the overflow channel 121 engages, which then creates a connection between the transverse bore 124 and the transverse bore 123 and thus between the pressure valve and the pressure line 120.

A screw thread 118 and an annular groove 119 are provided on the part of the valve housing 101 with the larger diameter.

Fig. 20 shows a further embodiment of a valve. In the valve housing 101, a bore 131 is provided which runs perpendicular to the valve longitudinal axis 139 and in which a push button 132 is mounted so as to be longitudinally displaceable. The bore 131 passes through the valve housing 101 and through a projection 133 which extends the valve housing 101 downwards and which has an inward-facing shoulder at its lower end on which a compression spring 134 is supported, the other end of which engages a shoulder provided on the push button 132. In the push button 132, a through-bore 135 is provided which is aligned with the bore of the pressure valve when the valve is in the position shown in Fig. 20, opening the pressure line 136. The through hole 135 has a smaller diameter part that faces the pressure valve and a larger diameter part that is on the opposite side and faces the pressure line 136. A step is formed between the smaller diameter part and the larger diameter part of the through hole 135. A locking piece 137 is inserted into a corresponding hole in the valve housing 101 and into the larger diameter part of the through hole 135, up to this stop in the through hole 135. The pressure line 136 is inserted into the locking piece 137.

Furthermore, a return flow channel 138 is provided in the push button 132, which is located between the through hole 135 and the shoulder of the push button 132 supporting the compression spring 134. The return flow channel 138 has an upper section that runs parallel to the valve longitudinal axis 139 and has an opening on the side facing the pressure valve, as well as a further section pointing vertically downwards from this upper section, which merges via a shoulder into a part with a larger diameter, into which a flexible return flow line

140 is inserted all the way.

If the valve is to be moved from the position shown in Fig. 20, which opens the pressure line 136, to the backflow position, the locking piece 137 is pulled out of the valve housing 101. The compression spring 134 then moves the push button 132, which is no longer locked by the locking piece 137, upwards until the locking ring 141 provided in the area of the lower end of the push button 132 and secured by an annular groove strikes the lower end surface of the projection 133 with its upper surface or rests against this surface. The locking ring

141 is arranged in such a way that in this position the upper section of the return flow channel 138 is aligned with the bore of the pressure valve, i.e. with the valve's longitudinal axis 139. The liquid leaving the pressure valve is thus guided through the return flow channel 138 into the return flow line 140 and from there back into the container in the direction of arrow 142. At the same time, the through hole 135 for the pressure line 136 is interrupted or closed.

To open the pressure line 136, the push button 132 is pressed downwards against the force of the compression spring 134, for example by a force acting on the upper end surface of the push button 132. When the through hole 135 is aligned with the hole of the pressure valve, i.e. with the valve's longitudinal axis 139, the locking piece 137 can be pushed in and the push button 132 locked. In this position shown in Fig. 20,

-22-the return flow channel 138 is closed.

The particular advantage of the embodiment according to Fig. 20 is that the valve is automatically closed when the pressure line 136 and the locking piece 137 connected to it are removed. The push button 132 then moves automatically into the return position by the pressure spring 134. An accidental discharge of liquid is impossible.

Fig. 21 shows a further embodiment of the valve. The bore of the pressure valve is connected via a shoulder to a bore of larger diameter, which forms a valve chamber 143. At the outer end of the valve chamber 143, a thread is provided into which a screw-in socket 144 is screwed, which has at its outer end a through-bore aligned with the valve longitudinal axis 139, into which the pressure line 136 is inserted.

A bore 145 widening conically towards the valve chamber 143 is provided in the screw-in socket 144. A piston 146 is also mounted in the valve chamber so that it can move longitudinally. The center axis of the piston 146 is aligned with the longitudinal axis 139 of the valve. The piston 146 has an outer cylindrical surface on its side facing the pressure valve, which is slidably mounted in the bore of the valve chamber 143, as well as an adjoining conical surface facing away from the pressure valve, the conical angle of which corresponds to that of the conical bore 145 in the screw-in socket 144.

Furthermore, the piston 146 has on its side facing away from the pressure valve a central bore aligned with the valve longitudinal axis into which the end of the pressure line 136 is inserted. The pressure line 136 has an inlet bore 147 outside the area in which it is inserted into the piston 146. Furthermore, pressure channels 150 are provided in the piston 146, which lead from the valve chamber 143 to the conical bore 145 in

the screw-in socket 144. These pressure channels 150 each have an opening in the end face of the piston 146 facing the pressure valve and an opening in the outer conical surface of the piston 146.

In the position shown in Fig. 21, the liquid flows from the pressure valve into the valve chamber 143 and from there back into the container via the return flow channel 138. The return flow channel 138 is provided in a return flow nozzle 148 which is integrally connected to the valve housing 101.

If the valve is to be brought into the pressure position, the pressure line 136 is moved inwards, i.e. to the left in Fig. 21, until the end face of the piston 146 facing the pressure valve strikes or rests on the shoulder between the bore of the pressure valve and the valve chamber 143, or at least until the return flow channel 138 is sealed. This takes place against the pressure of the compression spring 134, which is also the compression spring of the pressure valve and acts on the piston 146. The compression spring 134 is supported on the one hand on the valve ball 107 of the pressure valve, and on the other hand on a central projection of the piston 146, which faces the pressure valve and is aligned with the longitudinal axis 139 of the valve. In this position, the piston 146 or its outer cylinder surface seals the return flow channel 138. At the same time, a distance is formed between the rear openings of the pressure channels 150 in the piston 146, which are located in the outer conical surface of the piston 146 and are facing away from the pressure valve, and the inner conical surface of the bore 145 in the screw-in socket 144, so that the liquid can flow through the pressure channels 150 into the bore 145, from where this liquid can flow through the inlet bore 147 into the pressure line 136. The pressure line 136 can be locked in the position mentioned, shifted to the left compared to the position shown in Fig. 21, in a manner not shown in the drawing, for example by means of a union nut, which is screwed onto the external thread shown on the right in Fig. 21.

of the screw-in socket 144 and which can have inward-facing projections which overlap and take along the projections 149 provided on the outer surface of the return flow channel 138.

When the pressure line 136 is released again or the locking of the pressure line 136 is released, the piston 146 is moved by the force of the compression spring 134 into the position shown in Fig. 21, in which the pressure line 136 is closed and the return flow line 138 is open. In the embodiment according to Fig. 21, this also prevents an unintentional discharge of liquid after the pressure line 136 is disconnected. Furthermore, it is not necessary to switch a valve body for different work steps. No pressure line is inserted at first. The valve then works automatically in the return position. As soon as the valve is ready for operation, the pressure line 136 is inserted and locked. The valve then works in the pressure position or discharge position.

Claims (28)

93-0531 Z/sch 14 July 1993 WaIu-Apparatetechnik GmbH Lange Strasse 18 97877 Wertheim-Grünenwört Bottle dispenser Protection claims 1, Bottle dispenser for sucking and dispensing liquid from a container, consisting of a housing (1) with a cylinder (4) and a piston (10) which is guided longitudinally displaceably in the cylinder (4), wherein in the housing (1) there is provided a suction line (41) leading from the container to the cylinder (4) with a suction valve (42) and a pressure line (43) leading from the cylinder (4) out of the housing (1) with a pressure valve (44), marked by -2- a return line (45) branching off downstream from the pressure valve (44), through which the sucked-in liquid can be discharged back into the container. 2. Bottle dispenser according to claim 1, characterized in that the return line (45) can be detachably connected to the pressure line (43). 3. Bottle dispenser according to claim 1 or 2, characterized in that the return line (45) can be opened and closed by a valve (46). 4. Bottle dispenser according to claim 3, characterized in that the valve (46) can be brought into a first position in which the pressure line (43) is opened and the return line (45) is closed, and can be brought into a second position in which the pressure line (43) is closed and the return line (45) is open. 5. Bottle dispenser according to claim 3 or 4, characterized in that the valve (46) consists of a rotatable valve body (48) with a pressure channel (55) opening the pressure line (43) and a return channel (56, 58, 59) opening the return line (45). 6. Bottle dispenser according to one of claims 3 to 5, characterized in that the valve has a longitudinally displaceable, preferably spring-loaded (134) valve body (132, 146). 7. Bottle dispenser for sucking and dispensing liquid from a container consisting of a housing (1) with a cylinder (4), and a piston (10) which is longitudinally displaced in the cylinder (4). -3-sliding guided, wherein in the housing (1) there is provided a suction line (41) leading from the container to the cylinder (4) with a suction valve (42) and a pressure line (43) leading from the cylinder (4) out of the housing (1) with a pressure valve (44), characterized, that a valve (46) is provided in the pressure line (43), which can be brought into a first position in which the pressure line (43) is open, and which can be brought into a second position in which the pressure line (43) is closed . 8. Bottle dispenser according to claim 7, characterized in that the valve (46) locks the piston (10) in its second position closing the pressure line (43). 9. Bottle dispenser according to claim 7 or 8, characterized in that the valve (46) consists of a rotatable valve body (48). 10. Bottle dispenser according to one of claims 7 to 9, characterized in that the valve (46) has an actuating button or rotary knob (51) on which a projection (60) is provided which, in the second position of the valve (46) closing the pressure line (53), overlaps a shoulder (61) connected to the piston (10). 11. Bottle dispenser according to claim 10, characterized in that a part which overlaps the cylinder (4), preferably a cylinder sleeve (11), is connected to the piston (10), on which the shoulder (61) is arranged. -4- 12. Bottle dispenser according to claim 11, characterized in that the shoulder (61) is designed as a shoulder ring provided at the lower end of the cylinder sleeve (11). 13. Bottle dispenser according to claim 9, characterized in that the rotatable valve body (48) is provided with an external toothing (91) which engages in a toothing (92) provided on an actuating ring (93). 14. Bottle dispenser according to claim 13, characterized in that the actuating ring (93) is rotatably mounted on the housing (1) or on a support ring (86) connected to the housing (1). 15. Bottle dispenser according to one of claims 7 to 14, characterized in that the valve has a longitudinally displaceable, preferably spring-loaded (134) valve body (132, 146). 16. Bottle dispenser according to one of claims 7 to 15, characterized in that the valve (46) is provided in a valve housing (50) which can be detachably connected to the housing (1), in particular can be plugged onto the housing (1) and can be removed from the housing (1). 17. Bottle dispenser according to claim 16, characterized in that the valve housing (50) can be detachably connected to the housing (1) by a barb snap connection (62). 18. Bottle dispenser according to one of claims 7 to 17, characterized by the further features of one of claims 1 to 5. 19. Bottle dispenser for sucking and dispensing liquid from a container consisting of -5-a housing (1) with a cylinder (4) and a piston (10) which is guided longitudinally displaceably in the cylinder (4), wherein in the housing (1) there is provided a suction line (41) leading from the container to the cylinder (4) with a suction valve (42) and a pressure line (43) leading from the cylinder (4) out of the housing (1) with a pressure valve (44), characterized, that a support ring (86) is rotatably mounted in the housing (1), in which the pressure line (43) runs. 20. Bottle dispenser according to claim 19, characterized by the further features of one of claims 1 to 16. 21. Bottle dispenser for sucking and dispensing liquid from a container, consisting of a housing (1) with a cylinder (4) and a piston (10) which is guided longitudinally displaceably in the cylinder (4), wherein in the housing (1) there is provided a suction line (41) with a suction valve (42) leading from the container to the cylinder (4) and a pressure line (43) with a pressure valve (44) leading from the cylinder (4) out of the housing (1), marked by an outlet pipe connected to the pressure line (43) -6-line (56) with an outlet opening (75) and a protective cap surrounding the outlet line (56)
(67) which can be brought into a first position in which it exposes the outflow opening (75) and which can be brought into a second position in which it covers the outflow opening (75). 22. Bottle dispenser according to claim 21, characterized by a valve (46) provided in the pressure line (43) for opening and closing the pressure line (43). 23. Bottle dispenser according to claim 22, characterized in that the protective cap (67) is in the open position when the valve (46) is
its first position and when the valve (46) is closed, it is in its second position. 24. Bottle dispenser according to one of claims 21 to 23, characterized in that the protective cap (67) is
Axle (69) is rotatable. 25. Bottle dispenser according to claim 24, characterized in that the protective cap rotation axis (69) runs transversely to the cylinder longitudinal axis (17). 26. Bottle dispenser according to one of claims 21 to 25, characterized by an actuating button or rotary knob (51) by means of which the protective cap (67) can be brought into its two positions or rotated. 27. Bottle dispenser according to one of claims 21 to 26, characterized in that the rotary knob (51) has a screw surface (72) into which a nose (71) provided on the protective cap (67) engages for rotating the protective cap (67). -7- 28. Bottle dispenser according to one of claims 21 to 27, characterized by the further features of one of claims 1 to 16.