Tap assembly

Abstract

A tap assembly 10 with a hollow tap body 16 which defines a dispensing chamber 24 leading to an outlet arrangement 26. A valve assembly with a valve element 18 is provided to selectively open an inlet into the dispensing chamber 24. A push button 20 is provided which operates the valve assembly, and which defines an operating chamber 28, with the push button movable into the operating chamber. A connecting member is provided extending from the push button 20 through the operating chamber. A seal 39 is provided to prevent liquid passing from the dispensing chamber 24 to the operating chamber.

Claims

1. A tap assembly, the tap assembly including: a partially hollow body which defines a dispensing chamber within the partially hollow body with a liquid inlet and a liquid outlet, the liquid inlet being located to receive liquid to be dispensed by the tap assembly, the liquid outlet connecting to an outlet arrangement for the tap assembly; a valve assembly to selectively open the liquid inlet of the dispensing chamber, the valve assembly including a valve element selectively movable between a position closing the liquid inlet of the dispensing chamber and a position permitting liquid to pass therethrough; a push button for operating the valve assembly, the push button defining an operating chamber against a part of the partially hollow body, such that as the push button is pushed to operate the valve assembly the push button moves into the operating chamber; and a connecting member which extends from the push button through the operating chamber, through an opening in the part of the partially hollow body, and into the dispensing chamber to the valve element, the partially hollow body defining an air inlet separate from the outlet arrangement, and an air intake passage which extends from the air inlet to an air outlet connecting to the dispensing chamber spaced from the outlet arrangement, the air intake passage being separated from the connecting member and the push button, and the operating chamber and the air intake passage being connected by a vent.

2. The tap assembly of claim 1, wherein the air intake passage narrows from the air inlet to the air outlet.

3. The tap assembly of claim 1, wherein the air intake passage is aligned downwardly and the air outlet is aligned horizontally.

4. The tap assembly of claim 1, wherein the air intake passage extends around a single side of the opening.

5. The tap assembly of claim 4, wherein the vent is located on a side of the opening opposite of the side around which the air intake passage extends.

6. The tap assembly of claim 5, wherein the vent is closer to the air inlet than the air outlet.

Description

(1) An embodiment of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which:—

(2) FIG. 1 is a diagrammatic side view of a tap assembly according to the invention but with a cap removed;

(3) FIG. 2 is a diagrammatic exploded perspective view of the tap assembly of FIG. 1;

(4) FIG. 3 is a diagrammatic cross sectional view of the tap assembly of FIG. 1 in a closed position;

(5) FIG. 4 is a similar view to FIG. 3 but in an open position;

(6) FIG. 5 is a diagrammatic detailed perspective view of part of the assembly of FIG. 1;

(7) FIG. 6 is a diagrammatic detailed partially cut away view of part of the assembly of FIG. 1;

(8) FIGS. 7 and 8 are respectively diagrammatic partially cut away views of the assembly of FIG. 1 in open and closed positions.

(9) FIG. 9 is a further detailed diagrammatic perspective view of part of the apparatus of FIG. 1;

(10) FIG. 10 is a diagrammatic view from the rear of the assembly of FIG. 1;

(11) FIG. 11 is a diagrammatic sectional side view through the assembly of FIG. 1;

(12) FIGS. 12-14 are respectively front, side and front perspective views of part of the assembly of FIG. 1 illustrating an air intake passage;

(13) FIG. 15 is a diagrammatic front perspective view of part of the apparatus of FIG. 1;

(14) FIG. 16 is a diagrammatic perspective side view of the apparatus of FIG. 1;

(15) FIG. 17 is a diagrammatic side view of part of the apparatus of FIG. 1;

(16) FIG. 18 is a diagrammatic front view of part of the apparatus of FIG. 1;

(17) FIG. 19 is a diagrammatic perspective side view of part of the apparatus of FIG. 1; and

(18) FIG. 20 is a diagrammatic perspective view from beneath the part of the apparatus of FIG. 1.

(19) The drawings show a tap assembly 10 mountable on a container for dispensing liquid therefrom, and FIGS. 7 and 8 show the assembly mounted by a screw thread 12 on part of a container 14.

(20) FIG. 2 illustrates the main components of the assembly with a partially hollow tap body 16, a valve member 18, a push button 20 and a protective cap 22 which can be push fitted or threadingly mounted on the tap body 16.

(21) As shown for instance in FIGS. 3 and 4, the tap assembly 10 includes a body 16 which defines a dispensing chamber 24 leading to an outlet arrangement 26. The dispensing chamber selectively connects through the remainder of the hollow body, the lower part as shown in FIGS. 3 and 4, to the liquid container. A valve assembly which incorporates the valve member 18, selectively closes the connection between the lower part of the tap assembly and the dispensing chamber as shown in FIGS. 3 and 4.

(22) In FIG. 3 the valve member 18 is raised (as shown) closing the connection from the container to the dispensing chamber 24. The resilient push button 20 will in a relaxed condition automatically move the valve member to the raised closed condition shown in FIG. 3.

(23) In FIG. 4 the push button 20 has been pushed to open the tap assembly 10, but the push button 20 shown in FIG. 4 for clarity is not shown as deformed. Movement of the push button 20 has moved the valve member 18 downwardly as shown, such that liquid can pass either side of the valve member 18 and out through the outlet arrangement 26. It is to be realised that in uses the tap assembly 10 would usually be in the orientation shown in FIGS. 7 and 8, i.e. with the outlet arrangement 26 pointing downwardly and inclined gently outwardly away from the container 14.

(24) A space is provided beneath the push button 20 to define an operating chamber 28 which air can be pushed out of as the push button 20 is pressed to open the tap assembly 10. As can be seen the valve member 18 comprises a domed circular section valve part 29 which closes the entrance 30 to the dispensing chamber 24. A connecting member 32 extends from the valve part 29 and includes a cylindrical stem 34 with a profiled head 36. The profiled head 36 engages in a correspondingly shaped recess 37 in the underside of the push button 20 to mount the end of the push button 20 on the head 36.

(25) As can be seen in particular in FIGS. 3-8 the cylindrical valve stem 34 passes through an opening 38 in the body into the operating chamber 28. A seal 39 is provided at the end of the opening 38 as it enters the operating chamber. The seal is in the form of a swipe seal integrally formed with the remainder of the body providing a thin deformable lip 40, which is deformed by the valve stem 34 and resiliently urged thereon to provide a seal to prevent liquid from the dispensing chamber 24 entering the operating chamber 28 where potentially the liquid could be contaminated by the push button 20.

(26) In practice, it is found that the seal 38 tends to be deformed by between about 0.2 and 0.3 mm by the valve stem 34. FIG. 7 shows the tap assembly 10 closed, where the valve member 18 prevents liquid from entering into the dispensing chamber 24. FIG. 8 illustrates the tap assembly 10 open, with the seal 39 preventing liquid from entering the operating chamber 28.

(27) FIGS. 9 to 14 show a further feature of the tap assembly 10, in providing an air return for air to enter the container 14 as liquid is dispensed therefrom. The air intake includes an air inlet 42 which is located adjacent the outlet arrangement 26, but in use above the outlet arrangement 26. The air inlet 42 connects via a channel 44 which narrows in size to pass just to one side of the part of the body 16 through which the opening 38 extends, with the channel 44 not connecting with the opening 38. The channel 44 connects to an air outlet 46 extending into the dispensing chamber 24 at an upper point in use. In practice liquid will pass through the outlet arrangement 26 with air passing back through the air inlet channel 44, without being in contact with the opening 38 nor the operating chamber 28. The air inlet channel 44 is shown shaded in FIGS. 12 to 14 for clarity.

(28) As shown in for instance FIG. 15, a small air vent 48 is provided in the operating chamber 28 to allow air to vent as the push button 20 is pressed into the chamber 28. As shown for example in FIG. 12, the air vent 48 enters the air inlet channel 44 adjacent the air inlet 42, and on the opposite side of the opening 38 to that which the air inlet channel 44 passes. Air therefrom will therefore immediately be vented to atmosphere.

(29) FIGS. 16 to 20 illustrate the outlet arrangement 26 for the assembly 10, and in particular the spout 50 of the outlet arrangement 26. As can be seen for instance in FIG. 17, in use the outlet arrangement 26 is spaced below the air inlet 42. In side view it can be seen that the spout 50 includes first and second parts 52, 54, with the first part 52 being inclined at a greater angle to the horizontal than the second part 54. The first part 52 includes a substantially planar arcuate edge 56 extending for around 180°, with two fins 58 extending inwardly for around 12% of the diameter of the arcuate edge 56. The fins 58 are symmetrical about a centre line of the first part 52.

(30) The second part 54 includes two converging edges 60 at the indicated lesser inclination to the horizontal. Extending between the inner ends of the edges 60, is a recessed part 62 with a recess 64, which extends for over 40% of the diameter of the first part 52, and to a depth of at least 20% of the diameter of the first part 52.

(31) In use it has been found that the recess 64 prevents a meniscus forming across the spout 50, which otherwise could result in liquid becoming trapped and becoming stale. The fins 58 have been found to improve the flow of liquid through the spout 50.

(32) It has therefore been found that the described assembly 10 provides a number of advantageous features relative to previous tap assemblies. The assembly is however of relatively conventional configuration and can thus be inexpensively manufactured for long term and reliable operation.

(33) It is to be realised that various modifications may be made without departing from the scope of the invention. For instance the above dimensions and proportions may be varied as required. A different form of seal may be possible between the connecting member and the body. The air inlet passage may be differently configured. A different vent arrangement for the operating chamber may be provided.

(34) Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.