Creamy substance dispenser, in particular for toothpaste

Abstract: The invention provides a creamy substance dispenser formed from a small number of components of easy and economical construction and assembly. The dispenser comprises a main body defining a metering chamber communicating with a creamy substance container, within said chamber there being sealedly slidable a piston (7) from which there projects a hollow stem (8) extending into a hollow appendix (12) projecting from a skirt (13) rigid with the main body; the appendix (12) is provided with a discharge hole closable by the end of said stem (8) urged by a spring (20), the stem (8) freeing said discharge hole when made to translate by manual action.

Description: This invention relates to a creamy substance dispenser, in particular for toothpaste, which is of very simple and economical structure. Many creamy substances are enclosed in containers of elongate cylindrical form closed at one end by a base provided with lips which seal against the inner cylindrical surface of the relative container. This base is movable by the effect of atmospheric pressure, and moves (to reduce the volume of the chamber containing the creamy substance) each time a certain quantity of creamy substance is drawn through a non-return valve into a delivery chamber in which a vacuum has been created. On manually operating the dispenser, the substance is discharged from this chamber to the outside through a discharge hole provided in the dispenser forming part of the container. Known dispensers have a relatively complex structure and are therefore relatively costly. The most significant reference disclosing creamy substance dispensers is the EP-A-0376097 whose Figs. 1 to 9 show a dispenser having a compression chamber housing a piston 12 whose hollow stem 9 is made as a separate component part of the piston to which it is movably coupled, requiring the presence of shaped cavities 18 which are of very small size and can be made with great difficulty and also are expensive to be made: an actuator lever 4 is made as a further separate part coupled to a rigid skirt 13 and to the stem 9. As it can be easily understood the assembly of a dispenser according to the EP-A-0376097 can be made with difficulty because it is necessary to assure that pins 22 of the free end of the lever 4 be correctly positioned within the corresponding seats of the rigid skirt; that the lever 4 be correctly mounted upon the stubs 23 of the stem 9; and that the small hole provided near the edge of the diaphragm valve Vl be correctly positioned upon a corresponding small pin projecting from the base wall of the compression chamber. Moreover a very bad sealing can be obtained, because the discharge hole of the hollow stem 9 is simply closed by a tilting wall 11 moving and sliding across its free end; and because the diaphragm Vl cannot exert any appreciable pressure upon the edge of the hole to which it is superimposed (due to the fact that such diaphragm is retained only in one point at its periphery), so that the cream will surely pass from the compression chamber to the storage chamber when the dispenser is not in use. Figs. 14 and 15 of the EP-A-0376097 show a different version of the dispenser, with a piston 12 which is made in one piece with a hollow stem 9 extending into a hollow appendix 31. The piston can be axially moved by means of a lever 4, 4' (which is separately made from the other component parts of the dispenser) engaging a pin 36 laterally projecting from the stem and having a hook shaped free end 22 engaging a recess provided in the skirt 20. The mounting and positioning of the actuating lever is very difficult to be made and it can be noted that the piston 12 is positioned within a completely closed chamber defined by a component cupshaped shell superimposed to the cylindrical body K defining the storage chamber. It can be easily understood that the dispensers of the EP-A-0376097 comprise a lot of component parts whose correct coupling and assembling cannot be made in any reasonably economical way. The main object of the present invention is to provide a creamy substance dispenser which is of very low cost by consisting only of a very small number of parts of simple structure and easy assembly, while perfectly sealing the discharge hole to isolate the creamy substance present in the dispenser from the air. This and further objects are attained by a dispenser comprising a main body defining a chamber fillable with a creamy substance, said chamber housing a movable base which seals against and is freely slidable along the inner cylindrical surface of the chamber which, via a hole closed by a non-return suction valve, communicates with a metering chamber from which the creamy substance can be expelled to the outside through a discharge hole, said metering chamber sealingly housing a slidable piston made in one piece with a hollow stem which extends from the piston and which is closed at its free end in proximity of which it is provided laterally with apertures, the stem extending into a hollow appendix projecting from a substantially rigid skirt of a cap coupled to the main body, in said appendix there being provided said discharge hole which, when the dispenser is in its rest state, is sealed by the free end of the stem on which a compressed spring acts, from said skirt there projecting a manually tiltable lever having at least one fin which acts on said piston to cause it to move axially with consequent withdrawal of the free end of its stem from said discharge hole when said lever is pressed by a finger, characterized in that said metering chamber is laterally delimited by an open-end cylindrical tubular wall made in one piece with the main body and extending therefrom, and in that said lever is a tongue made in one piece with said skirt from which it extends. Preferably, said non-return valve is a disc-shaped valve whose center portion is supported by a pin projecting from said main body into said metering chamber and whose peripheral portion overlaps the edge of said hole. Still preferably, the spring is compressed against the center portion of said disc-shaped valve and said piston-stem body. The structure and characteristics of the creamy substance dispenser according to the present invention will be more apparent from the description of one embodiment thereof given hereinafter by way of non-limiting example with reference to the accompanying drawings in which: Figure 1 is a view of the dispenser from above; Figure 2 is a partial side elevation of the dispenser in the direction from left to right in Figure 1; and Figures 3 and 4 are partial longitudinal sections through the dispenser in its rest state, taken on the lines 3-3 and 4-4 of Figure 1 respectively. The dispenser shown on the drawings comprises a main body 1 defining a cylindrical chamber filled with a creamy substance (for example toothpaste), which is sealed at one end by a slidable base 2 (Figure 3) and closed at its other end by a flexible diaphragm 3 acting as a non-return valve and covering holes 4 from the centre of which there projects a pin 5 which retains the diaphragm 3. The structure described up to this point is conventional and common to most creamy substance dispensers. As can be seen from Figures 3 and 4, from the top of the body 1 there projects a cylindrical tubular wall 6 defining a metering chamber closed at one end by the diaphragm 3 and at its other end by a slidable piston 7 from which there extends a hollow stem 8 closed at its free end, in proximity to which there are provided apertures 10, immediately below which there is a flexible annular lip 11 projecting from the stem and sealing against the cylindrical surface of the longitudinal cavity of an appendix 12 projecting from a substantially rigid skirt 13 mounted on the upper end (relative to Figures 3 and 4) of the body 1. As can be seen from all figures, the skirt 13 is substantially in the form of a cap partly interrupted by two cuts 14 and 15, which in plan view are substantially of U-shape (Figure 1). These cuts define within the skirt two lateral portions 16 and a central portion 17, which are substantially rigid so that the hollow appendix 12 also remains substantially rigid and still during the operation of the dispenser. The intermediate portion 18 of the skirt (intended to act as a tongue on which a finger is rested), ie that portion lying between two cuts 14 and 15, is connected to the rigid portion 13 of the skirt by two strips 19 which are flexible. This flexibility is achieved by the elasticity of the material (plastics) with which the dispenser is constructed. It should also be noted that the hollow stem 8 is urged upwards by a spring 20 acting against the diaphragm 3, so that when the dispenser is in its rest state (Figures 3 and 4), the end 9 of the stem 8 presses and seals against the discharge hole provided at the upper end of the hollow appendix 12. The spring 20 rests against longitudinal ribs 21 projecting into the hollow stem 8. Finally, it can be seen that the rockable intermediate portion 18 of the skirt is connected to the substantially rigid part 13 of the skirt by a number of breakable teeth 22 (Figures 1 and 3) acting as a security seal, and that from each of the two strips 19 there projects a fin 23, the free rounded end of which rests on the upper end of the piston 7. It will be assumed that the rest position shown in Figures 3 and 4 applies, and that the chamber defined by the body 1, the metering chamber and the hollow stem 8 above the non-return diaphragm valve 3 are filled with toothpaste. The tongue 18 is then pushed downwards (relative to Figures 3 and 4) with a finger, by which firstly the security teeth 22 are broken (if not already broken) and the two strips 19 are flexed, with lowering of the fins 23 which press against the upper end of the piston 7 to cause it to approach the diaphragm valve 3 (which rests and seals against its seat, so closing the holes 4) and lower the stem 8 within the appendix 12, the discharge hole of which is left free by the end 9 of the stem. The toothpaste urged by the piston is hence expelled to the outside of the dispenser for use, the annular lip 11 preventing the toothpaste seeping downwards. When the tongue 18 is released, the piston 7 rises under the thrust of the spring 20 to create a vacuum which opens the diaphragm valve 3 and causes the toothpaste to rise through the holes 4. Theoretically, during the filling of the metering chamber, air could be drawn from the outside through the discharge hole and apertures 10. However because of the density of the toothpaste and the small dimensions of the apertures 10, this does not happen because the holes 4 are of much greater area than the apertures 10. On termination of the upward travel of the piston 7, the end 9 of the stem 8 becomes inserted into (and closes in an airtight manner) the discharge hole provided at the top of the hollow appendix 12, so that the toothpaste present in the dispenser is completely and perfectly isolated from the outside. It should be noted that operating the dispenser by the tongue 18 facilitates dispensing, because the tongue 18 and strips 19 act as levers which limit the force required for delivery. Finally, it should be noted that the described dispenser in its complete state consists only of six component parts, all of simple and economical construction and assembly.

Claims: A creamy substance dispenser comprising a main body (1) defining a chamber fillable with a creamy substance, said chamber housing a movable base (2) which seals against and is freely slidable along the inner cylindrical surface of the chamber which, via a hole (4) closed by a non-return suction valve (3), communicates with a metering chamber from which the creamy substance can be expelled to the outside through a discharge hole, said metering chamber sealingly housing a slidable piston (7) made in one piece with a hollow stem (8) which extends from the piston (7) and is closed at its free end (9) in proximity of which it is provided laterally with apertures (10), the stem (8) extending into a hollow appendix (12) projecting from a substantially rigid skirt (13) of a cap coupled to the main body (1), in said appendix (12) there being provided said discharge hole which, when the dispenser is in its rest state, is sealed by the free end (9) of the stem (8) on which a compressed spring (20) acts, from said skirt (13) there projecting a manually tiltable lever (19) having at least one fin (23) which acts on said piston (7) to cause it to move axially with consequent withdrawal of the free end (9) of its stem (8) from said discharge hole when said lever (18, 19) is pressed by a finger, characterized in that said metering chamber is laterally delimited by an open-end cylindrical tubular wall (6) made in one piece with the main body (1) and extending therefrom, and in that said lever (19) is a tongue made in one piece with said skirt (13) from which it extends. A dispenser according to claim 1, characterized in that said non-return valve (3) is a disc-shaped valve whose center portion is supported by a pin (5) projecting from said main body (1) into said metering chamber and whose peripheral portion overlaps the edge of said hole (4). A dispenser according to claim 2, characterized in that the spring (20) is compressed against the center portion of said disc-shaped valve (3) and said piston-stem body (7, 8).

Inventors: ALBINI GIOVANNI, CARLAPPI FRANCO, RUSCITTI TOMMASO, ALBINI, GIOVANNI, CARLAPPI, FRANCO, RUSCITTI, TOMMASO
Applicants: TER SRL, TER S.R.L.
Application year: 1995
Main classification: B05B11
IPC codes: B65D47, B05B11, B65D83