DEVICE WITH BUTTON INCORPORATING A SHUTOFF-MEANS, FOR DELIVERING LIQUIDS IN ATOMISED FORM

Abstract: The device comprises a pump (1) with its plunger (20) mobile in a cylinder against the action of a spring (8), and a delivery button (2) associated with the plunger (20) for controlling its delivery movement. The button (2) incorporates a shut-off member provided on a flexible diaphragm (22) fixed peripherally in a seat (24) in the button (2).

Description: This invention relates to a device for the atomised delivery of liquids (such as perfumes, medicaments) from containers according to the preamble of the appended main claim. US-A 4057176 discloses a manually operated spray pump of the type referred to in the preamble of the main claim. The valve member of the known pump is integrally formed with the button. Liquid pressure acts on the valve member and a lower compressed air pressure acts on the region of the diaphragm which surrounds the integral valve member, said air mixing with the liquid and contributing to the atomization of the liquid. This known pump is of a complicated nature, its valve opens at very high pressure (due to the reduced section on which the liquid pressure acts) causing excess liquid to be dispensed, and when, all being equal, liquids atomising at different pressures are to be dispensed there is the need of changing the button in its whole. An object of the invention is to provide an atomised delivery device comprising a pump of simple construction, in which the button itself determines the quality of atomisation of the particular liquid concerned. This and further objects which will be more apparent from the detailed description given hereinafter are attained according to the invention by a device of the indicated type, and inventively identified by the characterizing clause of the appended main claim. Atomisation can therefore be optimised by correct choice of diaphragm flexibility and working section (the working section being that part of the diaphragm surface which undergoes deformation). The invention will be more apparent from the detailed description of three embodiments thereof given hereinafter by way of non-limiting example with reference to the accompanying drawing, in which: Figure 1 is an axial section through a first embodiment of the delivery device according to the invention, and Figures 2 and 3 are axial sections through two further embodiments of the invention. In Figure 1, the reference numeral 1 indicates a conventional plunger pump (described in Italian Patent 1,038,354) and 2 indicates an operating and atomisation button. The pump 1 comprises a hollow body 3 secured at its upper end to a cap 4 by a flange 5. The cap 4 is used for connection to a container, not shown, containing the liquid to be delivered, into which there dips a tube 6 force-fitted into the lower end of the hollow body 3. A ball 7 acting as an intake valve is disposed in the hollow body 3, in which there is also housed a compression spring 8 which acts between a plunger 20 and an inner shoulder on the body 3. The plunger slides within the body 3 along that region thereof of cross-section 9. It has its rod 9 traversed by a dead-end bore 10. This bore opens at its lower end into radial bores 11 which open into a circumferential groove 12 housing an O-ring 13. The height H of the groove 12 is greater than that of the ring 13, so that the ring is displaced upwards or downwards in this groove according to the direction of movement of the plunger 20, to close the bores 11 when in its lower position and to open them when in its upper position. The button 2 is force-fitted onto the rod 9, and comprises a duct 21 positioned as an extension to the plunger bore 10. This duct opens into an interspace below an elastically deformable diaphragm 22 provided with a thickened peripheral edge 23 which is clamped in an annular undercut groove 24 provided in the top of the button. The diaphragm 22 comprises in the centre of its inner face a projection 25 able to close a hole 26 provided in the button and communicating with the duct 21 when the projection is raised from the hole 26. The hole 26 extends transversely in the form of a channel 27 of annular cross-section in which a conventional atomiser nozzle 28 is force-fitted in hydraulic communication with the channel. The diaphragm section subject to deformation is indicated by M and is larger than the section P of the plunger or of the bore in the body 3 within which the plunger slides. It will be assumed that after the previous delivery a given quantity of liquid has remained trapped in the hollow body 3 between the plunger 20 and ball 7. When the user wishes to deliver liquid he pushes (arrow F) the button 2 by pressing the diaphragm to close the hole 26 by means of the projection 25. The liquid therefore becomes pressurised and this pressure extends as far as below the diaphragm 22 to exert a thrust thereon which acts against that exerted by the user in the direction of the arrow F and is related of the ratio of M to P. At a certain moment this opposing force exceeds the other so that the diaphragm rises to displace the projection 25 from the hole 26, and the pressurised liquid flows to the nozzle to emerge therefrom in atomised form. On releasing the button 2 the spring 8 returns it to its initial position. During this stage liquid is drawn into the body 3 through the dip tube 6 and intake valve 7. To satisfy the requirements of liquids which atomise at different pressures it is necessary only to replace the diaphragm 22 with another of different flexibility characteristics, for example by providing stiffer, thinner or thicker parts or using different materials. A further embodiment of the invention is shown in Figure 2. In this, parts identical or corresponding to those of Figure 1 are indicated by the same reference numerals marked with a prime. In this case, the diaphragm 22′ has its projection 25′ at the upper end of a central tubular appendix 40 which is drawn over the rod 9′ and is provided with an eccentric hole 41 to establish communication between the duct 10′ of the rod 9′ and the hole 26′ with which the projection 25 cooperates. Operation is similar to that of the embodiment of Figure 1. The thrust F′ on the button results in the creation of a pressure which is transmitted through the hole 41 and into the interspace 50′ between the button and diaphragm. At a certain point the valving member 25′ separates from the hole 26′ so that the pressurised liquid flows to the nozzle 28′ to emerge in atomised form. Figure 3 shows a third embodiment of the invention with its container holding the liquid to be delivered. Identical or corresponding parts are again indicated by the same reference numeral but with a double prime. The button 2″ is in this case of bell shape and comprises a flange or lower ledges 80′ which the user presses to deliver the liquid. The diaphragm 22″ is at the centre of a tubular appendix 40″ into which the upper end of the rod 9″ of the pump 1″ penetrates. From the top of the appendix 40″ there extends a projection 25″ which acts on a delivery hole 80 in the button. Ribs, channels or the like 90 of approximately helical or inclined extention located beyond the valving end 91 of the projection 25″ create turbulence with facilitates atomisation. In the transition region between the projection 25″ and the tubular 40″, holes 41″ are provided to connect the duct 10″ of the rod 9″ to the interspace 50″ between the button 2″ and said parts of the diaphragm 22″. The plunger 20″ of the pump 1 is moved by pressing 80′ with the forefinger and ring finger. The conical end 91 of the projection 25″ then makes contact with and closes the hole 80. The liquid contained in the pump flows into the interspace 50″. As the thrust increases, the moment is reached when the end 91 separates from and opens the hole 80. The liquid then moves with vortex motion to the hole 80, atomising as it emerges from it. Again as in the preceding cases, atomisation at different pressures can be obtained by altering the flexibility characteristics of the diaphragm.

Claims: A device for the atomised delivery of liquids (such as parfumes and medicaments) from a container, comprising a pump having a plunger with a bore, mobile in a cylinder against the action of a spring, a delivery button for manually operating the plunger and connected thereto and comprising a delivery duct or hole controlled by a valve member carried by a flexible diaphragm, characterized in that: a) the diaphragm (22,22',22") is fixed peripherally in a seat (24) of the button (2,2',2"), and b) the diaphragm (22,22',22") has a working section (M,M',M") larger than the section (P,P',P") of the plunger (20,20',20") and defines with the button (2,2',2"), around the valve member (25,25',25"), an interspace (50,50') communicating with the plunger bore (10,10',10") such that on operation of the plunger (20,20',20") the diaphragm under pressure in said interspace (22,22',22") lifts the valve member (25,25',25") from the delivery duct or hole (26,27;26';80) so that said duct or hole (26,27;26';80) communicates with said interspace (50,50'). A device as claimed in claim 1, characterized in that the diaphragm (22) is located in an exposed position in the top of the button (2). (Figure 1) A device as claimed in claim 1 characterized in that the diaphragm (22',22") is located within the button (2',2"). A device as claimed in claims 1 and 3, characterized in that the diaphragm (22',22") comprises a central tubular projection (40,40") into which the end of the rod (9',9") of the plunger (20',20") is inserted. A device as claimed in claims 1,3 and 4, characterized in that the valving member (25',25") is situated at the centre of the tubular projection (40,40"). A device as claimed in claims 1,3,4 and 5, characterized in that at least one hole (41,42") is provided in the tubular projection (40,40") to enable pressure to be transmitted from the pump (1',1") to the interspace (50',50") between the diaphragm (22',22") and the button (2',2").

Inventors: GIUFFREDI, GIANCARLO
Applicants: COSTER - TECNOLOGIE SPECIALI S.P.A.
Application year: 1988
Main classification: B65D47
IPC codes: B65D47, B05B11