Dispensing measures

Abstract: The present invention relates to dispensing measures and in particular to measures for use in dispensing drinks and other liquids which are of relatively high viscosity, such as cream based liqueurs. The dispensing measure has a measuring chamber (5) with an entry port (8) and an exit port (11), an internal operating standard (12) and a means (24) to move the internal operating standard (12) between a dispensing position in which it seals the entry port (8) and a resting position in which it seals the exit port (11). The dispensing measure is also provided with a nose (13) external to the measuring chamber (5), whereby the nose (13) guides fluid into a receptacle, held beneath the dispensing measure, when fluid is being dispensed thereform.

Description: The present invention relates to dispensing measures and in particular to measures for use in dispensing drinks and other liquids which are of a relatively high viscosity, such as cream-based liqueurs. Conventional measures dispense liquids via a tubular outlet. When a high viscosity liquid is dispensed, a deposit of liquid is left on the inside of the tube and the tube eventually clogs with the residual materials if regular cleaning does not take place. In the case of cream-based liqueurs, the deposit loses its alcohol by evaporation, with the result that the remaining cream is no longer preserved against microbial spoilage. It is an object of the present invention to provide a dispensing measure which prevents any build up of materials being dispensed. In addition, conventional measures are operated by an arm at the base of the measure which is actuated by a glass. It is, therefore, not very hygenic to refill an already used glass using this system. Accordingly, it is a further object of this invention to provide a measure which requires no contact with the glass whatsoever. It is a still further object of the invention to provide a dispensing measure which is tamper-proof. Conventional dispensing measures are fitted with a number of seals, for example, a bottom seal, a poppet valve seal, a head seal and a wiper seal. These seals become worn and can deteriorate fairly rapidly in spirits. It is another object of the present invention to provide a dispensing measure which has a reduced number of operating seals in contact with the spirit to be dispensed. Examples of prior art dispensers are shown in CH-A-386869, CH-A-461975 and DE-A-1934596. FR-A-1021942 discloses a dispensing measure having a head assembly with means for engagement with the neck of a bottle, a measuring chamber having an entry port and an exit port, an internal operating standard and a means to move the internal operating standard between a dispensing position in which it seals the entry port and a resting position in which it seals the exit port, a nose which is an extension of the internal operating standard extends beyond the outlet portion externally of the measure, and which has an external surface for guiding fluid flow. The construction disclosed is, however, not easily cleanable after use. The invention is characterised over FR-A-1021942 in that the entire external surface of the nose is external to the outlet portion when in the resting position and in that the internal operating standard has a body portion which fits slidably and sealingly within the outlet portion such that the internal wall of the outlet portion is wiped clean as the internal operating standard returns to the resting position after dispense. The dispensing measure may be provided with an alignment means which ensures that the internal operating standard is aligned with the entry and exit ports as it travels between its resting position and its dispensing position. The alignment means may be a set of fins around both the entry port and the exit port, the said fins being within the measuring chamber and the internal operating standard travelling between the fins of each set. Preferably, the means to move the internal operating standard between the dispensing position and the resting position is a lift rod attached to an operating lever. The internal operating standard may be fixed directly to one end of a lift rod, the lift rod passing through an aperture in the roof of the measuring chamber and the other end of the lift rod being connected to the operating lever, such that as the operating lever is depressed the lift rod is drawn into the head assembly thereby pulling the internal operating standard into the dispensing position. According to a further preferred feature of the invention, the lift rod is L-shaped so that the foot of the L engages the internal operating standard, which is of cylindrical shape. Advantageously, the dispensing measure is provided with an air valve which allows air to enter the measuring chamber as liquid is being dispensed therefrom. The aperture in the roof of the measuring chamber through which the lift rod passes may be adapted to form the air valve. In the preferred embodiment, one portion of the lift rod is of constant diameter over a portion of its length, this constant diameter portion sealing the said aperture when the dispensing measure is in the resting position, the lift rod tapering down to a reduced diameter portion such that as the lift rod is drawn into the head assembly when the operating lever is depressed, the said reduced diameter portion cannot seal the said hole and air is allowed to bleed into the measuring chamber. Preferably, the air valve is provided with an "O"-ring seal to aid in sealing the valve. The operating lever may be provided with a return mechanism which returns the lever to its resting position after it has been depressed. The return mechanism may comprise a return spring. The dispensing measure may be provided with a timing device which ensures that a full measure is dispensed. The timing device may comprise a piston connected to the operating lever and movable within a piston chamber which is open to the atmosphere at its base, the top of the piston chamber being sealed to atmosphere except for a small air vent. When the operating lever is depressed the piston is pushed into the piston chamber and when the lever is released the return spring acts to return the lever and the piston to the resting position. Movement of the piston up the piston chamber is delayed because air in the chamber can only escape slowly through the air vent and the air pressure in the piston chamber must be overcome before the piston returns to rest. Preferably the timing device is provided with a regulating means which can alter the size of the said air vent thereby allowing the dispense time to be adjusted. The regulating means may take the form of a regulating screw. The head assembly may be formed with a solid internal portion which serves to separate the head assembly from the liquid in the measuring chamber. The dispensing measure may be provided with a counter which counts the number of liquid measures dispensed by the measure. The dispensing measure may also be provided with a signalling device which can signal the number of liquid measures dispensed to a cash register or computer. Embodiments of the present invention will now be described with reference to the accompanying drawings, in which:- Figure 1 is a front elevation of one embodiment of a dispensing measure according to the invention, Figure 2 is a rear elevation of the measure, Figure 3 is a right side elevation of the measure, Figure 4 is a vertical cross section of the measure as seen from the right side on the line IV-IV in Figure 6, Figure 5 is a vertical cross section of the measure on the line IV-IV in Figure 6, showing an alternative embodiment of the return spring, Figure 6 is a top plan view of the measure, Figure 7 is an underneath plan view of the measure, Figure 8 is a cross-section through a portion of a second embodiment of a dispensing measure according to the invention showing the measuring chamber and internal operating standard in greater detail, Figure 9 is an underneath plan view of the exit port of the second embodiment of the dispensing measure, Figure 10 is a cross-section through the dispensing measure along the line a-a in Figure 8, and Figure 11 is a detailed view of the nose of the internal operating standard in accordance with the second embodiment of the invention. As shown in the drawings, the dispensing measure comprises a head assembly 1 closed by a cap 2, from which projects a portion of a spigot tube 3 with a resilient bung 4 for engagement in the neck of a bottle. Below the head assembly 1 there is a measuring chamber 5. The spigot 3 has a hollow central channel 6 which extends through the head assembly and which is divided in two by a central plate 7 (not shown because it is parallel to plane of Figure 4). This arrangement allows liquid to flow into the measuring chamber 5, from the bottle, via an entry port 8 in the roof of the chamber 5 and at the same time allows air to flow out of the chamber 5 as in conventional dispensing measures. The measuring chamber 5 is defined by a transparent plastics wall 9 of frusto conical shape with a flat base portion and an annular outlet portion 10 at the centre of the base, defining an exit port 11 which allows liquid to flow out of the measuring chamber. Within the measuring chamber 5 there is an internal operating standard 12 which seals the exit port 11 in the base of the measuring chamber 5, when the measure is not dispensing liquid. The internal operating standard 12 is provided at its lower end with a nose 13 which extends beyond the exit port 11 externally of the measuring chamber 5. The nose is generally cylindrical with a radiused tip 14. Alternatively, as shown in Figures 8 and 11, the nose 13 extends downwardly from a radiused step 15, which in rest position is level with the bottom of the exit port. The nose 13 then tapers slightly to a radiused tip 14. The tip 14 should not have any nobble or bulbous shape, which might cause the liquid to form a tear drop. The nose 13 should be long enough for a smooth even flow to be established, guided by the nose 13, out of the exit port 11 when the internal operating standard 12 is in the dispensing position. The internal operating standard 12 is generally cylindrical. Its lower body portion 16 is a sliding fit inside the cylindrical internal wall of the outlet portion 10, and it carries an O-ring 17 which ensures sealing of the exit port 11. The base of the lower body portion is level with the bottom of the outlet portion 10 when the internal operating standard is in the rest position. The upper end portion 18 of the internal operating standard 12 likewise is a sliding fit in the lower end region of the spigot 3 which defines the entry port 8. The upper end portion 18 carries an O-ring 19 which seals the entry port 8 when the internal operating standard is in the dispensing position. Alternatively each end portion of the internal operating standard may be machined to be a close sliding fit within its respective port, so that the O-rings may be dispensed with. The internal operating standard 12 is positioned vertically within the measuring chamber 5 by means of two sets, each of three fins, between which the internal operating standard 12 travels. The radially inward face of each fin is generally vertical. One set of fins 20 is positioned symmetrically around the exit port 11, while the other set of fins 21 is positioned symmetrically around the entry port 8, the fins in each case lying within the measuring chamber 5. The internal operating standard 12 is moved by a direct lift rod 22 which is generally L-shaped. The foot of the L-shape passes through a hole in the internal operating standard and thus engages it. The leg of the L-shape passes through an aperture 23 in the roof of the measuring chamber 5 and its top end is fixed to a lever 24 within the head assembly 1. The measure is operated by means of the lever 24, which can be pressed by the operator's finger while the thumb engages fixed handle 25. When the lever 24 is depressed the lever 24 pivots about a horizontal pin 26, thus raising the end of the direct lift rod 22. The lever 24 comprises a horizontal finger plate 27 and two vertical wall portions 28 bridged by the pivot pin 26 and by a further pin 29 attached to the head of the direct lift rod 22. The space between the two wall portions 28 accommodates the spigot tube 3. The top edges of the wall portions 28 are inclined downwardly from the finger plate 27, so that the wall portions can be accommodated within the head assembly 1 when the finger plate 27 is depressed. The direct lift rod 22 is pulled into the head assembly 1 by the operation of the lever 23 and it in turn raises the internal operating standard 12. As shown in Figure 4 the lever 24 acts against a return spring 30 located above the direct lift rod 22. The spring 30 acts between a boss 31 moulded on the upper surface of the internal end of the lever 24, and a cup 32 moulded onto the inner surface of the cap 2. As shown in Figure 5 the return spring 30 may alternatively be located within the cap 2, between the handle 27 and the base of the head assembly 1. As the internal operating standard 12 is raised, the entry port 8 is sealed by upper end portion 18 of the internal operating standard and the exit port 11 is opened, thus allowing the liquid in the measuring chamber 5 to flow out. As the liquid flows out, the nose 13 guides the flow of liquid without splashing into a glass held beneath. The nose 13 ensures a clean laminar flow. The length of the internal operating standard 12 is designed such that the portion 18 seals entry port 8 and prevents further liquid flowing into the measuring chamber 5, before the exit port 11 is opened. The direct lift rod 22 also operates an air valve 33 which serves to allow air to enter the measuring chamber 5 as liquid is being dispensed, in order to fully dispense the contents of the chamber 5 and to avoid any retention of liquid due to the creation of a vacuum in the measuring chamber 5. The aperture 23 in the roof of the measuring chamber 5 through which the direct lift rod 22 passes, is sealed with an "O"-ring seal 34 (not shown) which is fixed into position. The direct lift rod 22 is of constant diameter over a portion 35 of its length and then it tapers down to a reduced diameter portion 36. The length of the constant diameter portion 35 is determined such that when the direct lift rod 22 travels upwards in response to depression of the lever 24, the reduced diameter portion 36 does not reach the "O"-ring seal 34 in aperture 23, to permit ingress of air into the chamber 5, until the internal operating standard 12 has been raised sufficiently to open the exit port 11. The "O"-ring seal 34 is therefore sealed to atmosphere until the exit port 11 is opened. Since the "O"-ring seal 34 is fixed in position and it is only the direct lift rod 22 which moves, no springs are required to maintain the seal, as in conventional dispensing measures. A pneumatic timing device (shown in Figure 4) may also be incorporated into the head assembly 1 to ensure that a full measure is dispensed even if lever 24 is not kept in the depressed position until the measuring chamber 5 is completely emptied. The timing device comprises a piston 43 which is connected to lever 24 and which is pushed into a piston chamber 44 when the lever 24 is depressed. The piston chamber 44 is open to the atmosphere at its base. When the lever 24 is released, the return spring 30 tries to return the lever 24 to its resting position and the piston 43 tries to travel up the piston chamber 44. However, the top of the piston chamber is sealed to the atmosphere with the exception of a small air vent 45. Air pressure, therefore, delays travel of the piston 43 up the piston chamber 44 and in turn delays the return of the lever 24 to its resting position, until the air pressure is overcome. The incorporation of the pneumatic timing system therefore, ensures, if necessary, that a full measure is dispensed. The timing device also incorporates a regulating screw 46 which can be used to adjust the size of the air vent 45, thereby allowing for different times of dispense. The dispensing measure is designed such that as the internal operating standard 12 returns to its resting position after liquid has been dispensed, it wipes clean the exit port 11, thus preventing any build up of liquid around the exit port 11. The dispensing measure of the present invention is also designed so that the only part of the measure which is both in contact with the liquid to be dispensed and open to the atmosphere is the nose 13 and it is simple to wipe clean after use. In this dispensing measure, the measuring chamber wall 9 may be ultrasonically welded to the head assembly 1 which ensures that the measuring chamber 5 is sealed for the life of the measure and this renders it tamper-proof. The dispenser can be mounted on a bar or similar support by means of a mounting plate 37. The seals 34, 17 and 19 are preferably made of silicone rubber. Although they are in contact with the liquid, they are not immersed in it. In an alternative embodiment of the measure shown in Figure 8, the annular outlet 10 may be cylindrical and formed in two parts: a body portion 38 integral with the bowl of the measuring chamber and having a rebate opening downwardly; and a sleeve portion 39 which fits into the rebate in such a manner that the body portion 38 and sleeve portion 39 together form a cylindrical wall for the outlet. As shown in Figures 8 and 9, the internal surface of the sleeve portion 39 is provided with a flexible annular web 40 which replaces the O-ring 17 of the first embodiment. With time, the end of the internal operating standard which seals the exit port 11 may wear but this effect is compensated by the provision of the flexible annular web 40 about the exit port 11. In this embodiment the internal operating standard 12 bears a flange 41 to which one end of the direct lift rod 22 is fixed. The dispensing measure of the present invention may optionally have a sealed counter to count the number of liquid measures which have been dispensed. The counter may be either a mechanical counter of the type desribed in British Patent No. 2 036 695 B or it may be an electrical counter. It may also include a signalling device which passes a signal to a cash register or computer each time a measure is dispensed. The internal operating standard 12 can be manufactured from a food quality polytetrafluoroethylene such as that sold under the Trade Mark "Teflon" or a similar material having a very low coefficient of adhesion, while the web 40 may be made of an ultrahygenic plastics such as "Chemital" (Trade Mark). Although designed particularly for use with cream-based liqueurs, the dispensing measure has general application in dispensing liquid measures. These need not, however, necessarily be drinks; instead they could be pharmaceuticals, foodstuffs such as ketchup, mayonnaise or cream, or acid cleaners for coffee machines.

Claims: A dispensing measure having a head assembly (1) with means for engagement (4) with the neck of a bottle, a measuring chamber (5) having an entry port (8) and an exit port (11), an internal operating standard (12) and a means (24) to move the internal operating standard (12) between a dispensing position in which it seals the entry port (8) and a resting position in which it seals the exit port (11), a nose (13) which is an extension of the internal operating standard (12) extends beyond the outlet portion (10) externally of the measure, and which has an external surface for guiding fluid flow, characterised in that the entire external surface of the nose (13) is external to the outlet portion (10) when in the resting position and in that the internal operating standard (12) has a body portion (16) which fits slidably and sealingly within the outlet portion (10) such that the internal wall of the outlet portion (10) is wiped clean as the internal operating standard (12) returns to the resting position after dispense. A measure accordingly to claim 1 which is provided with an alignment means (20,21) which ensures that the internal operating standard is aligned with the entry (8) and exit (11) ports as it travels between its resting position and its dispensing position. A measure according to claim 1 wherein the alignment means (20,21) are a set of fins around both the entry port (8) and the exit port (11), the said fins (20,21) being within the measuring chamber (6) and the internal operating standard (12) travelling between the fins of each set. A measure according to any of the preceding claims wherein the means to move the internal operating standard (12) between the dispensing position and the resting position is an operating lever (24) actuable by a manual squeezing action between the said lever (24) and a fixed member (25). A measure according to claim 6 wherein the internal operating standard (12) is fixed to one end of a lift rod (22), the lift rod (22) passing through an aperture (23) in the roof of the measuring chamber (5) and the other end of the lift rod (22) being connected to the operating lever (24), such that as the operating lever (24) is depressed the lift rod (22) is drawn into the head assembly (1) thereby pulling the internal operating standard (12) into the dispensing position. A measure according to any of the preceding claims wherein the dispensing measure is provided with an air valve (33) which allows air to enter the measuring chamber (5) as liquid is being dispensed therefrom. A measure according to claim 6 having an aperture (23) in the roof of the measuring chamber (5) through which a lift rod (22) passes, the lift rod (22) being of constant diameter over a portion (35) of its length, the constant diameter portion (35) sealing the said aperture (23) when the dispensing measure is in the resting position, the lift rod (22) tapering down to a reduced diameter portion (26) such that as the lift rod (22) is drawn into the head assembly (1), the said reduced diameter portion (36) cannot seal the said aperture (23) and air is allowed to bleed into the measuring chamber (5). A measure according to claim 4 or 5 wherein the operating lever (27) is provided with a return mechanism (30) which returns the lever (27) to its resting position after it has been depressed. A measure according to claim 5 or 6 which is provided with a timing device comprising a piston (43) connected to the operating lever (27) and movable within a piston chamber (44) which is open to the atmosphere at its base, the top of the piston chamber being sealed to atmosphere except for a small air vent (45) provided with a regulating means (46) which can alter the size of the said air vent (45) thereby allowing the dispense time to be adjusted.

Inventors: GRIFFITHS RONALD STANLEY, SEARLES JOHN EDWARD, GRIFFITHS, RONALD STANLEY, SEARLES, JOHN EDWARD
Applicants: BAILEY & CO LTD R & A, R. AND A. BAILEY & CO. LIMITED
Application year: 1987
Main classification: B67D3
IPC codes: G01F11, B67D3