A dispenser of paste products with refill-type container

Abstract: A dispenser for paste products, comprising a container (1) and a hollow dispensing head (2) having a pumping member (15) mounted on its interior, an actuating lever (6) for said member, and a delivery conduit (5) which is associated at one end with the pumping member (15). The head (2) has a tubular extension (25) facing the top end of the container (1) of which it matches the contour and wherein means (26) are provided of releasable attachment to the container, thereby the latter can be provided in the form of a replaceable refill container. To extend the working life of the dispensing head (2), the pumping member (15) has a leaf spring (20) associated therewith which acts against the push force from the actuating lever (6).

Description: This invention relates to a dispenser of paste products according to the preamble of claim 1. Such a dispenser is shown in EP-A-0 286 608 for example. As may be seen, the dispenser known from that European Application provides for the tubular body of the container of paste product to be dispensed to also define, in its upper portion, a housing for the operational members, specifically for the pumping member, the delivery conduit, and the actuating lever. It will be appreciated, accordingly, that once the container has been emptied, the dispenser can no longer be re-used, and must be disposed of. In this way, however, a dispenser portion is also thrown away unavoidably which is technologically more intensive, such as the dispensing head together with its components and mechanisms. It has been already proposed to provide a dispenser, such as that disclosed in EP-A-0 330 929, which allows the dispensing bead to be re-used for a given number of times by replacing the empy container with a fresh one. According to the dispenser shown in EP-A-0 330 929, the head is provided with a hollow longitudinally extending body for housing the refill which is to be secured to that body by means of matching threads provided at the free bottom end of the hollow body and on a portion of the wall of the refill near its base. Moreover, the head is provided with a rod, axially extending in said hollow body, to be connected to the piston of the dispensing mechanism which is housed in the refill. According to the dispenser of EP-A-0 330 929, therefore, the new refill must be sold equipped with a new piston and the dispenser head, in order to be reused must comprise, not only the necessary actuating means, but also the hollow body for housing the refill and the rod to be connected to the new piston of the new refill. This is a serious drawback both from the economic point of view and from the functional point of view. The object of the present invention is that of providing a dispenser which allows its dispensing head to be re-used without the economic and practical drawbacks of the known dispensers. A further object is that of extending the working life of the pumping member, as well as of allowing the possible use of non-elastomer materials in its costruction. The above objects are achieved by a dispenser according to the appended claim 1. The invention will be now described in greater detail with reference to a preferred, non-limitative embodiment thereof, shown in the accompanying drawings, where: Figure 1 is a partly cut away view of a dispenser according to the invention; Figure 2 shows, in axial section and to an enlarged scale, the dispensing head; Figure 3 is a partly cut away side view of a container in its form as a refill container; Figure 4 is a plan view of a leaf spring for the pumping member; and Figure 5 is a sectional view of the leaf spring taken along V-V in Figure 4. With reference to the drawing views, generally shown at 1 is the tubular container of a dispenser according to the invention which is provided with a bottom wall 1a conventionally adapted to be moved upwards through the container as the paste product is being dispensed. Generally indicated at 2 is the dispensing head of hollow construction. This head comprises a removable protective cap 3 which fits over a structure 4 whereto the delivery conduit 5 is attached. An actuating lever 6 is linked to said structure 4 by means of a pivot pin 7 such that it can perform angular movements about said pin which will take its shank 8 away from the edge 9 of the structure 4. The lever 6 is also provided with a lip 10 which, with the lever at its home or rest position as shown in Figure 1, covers the outlet port 11 of the delivery conduit 5 having, at its opposite end, an inlet port 12 on a conduit section 13 which extends along the longitudinal axis X-X of the head and the whole dispenser. This section 13 of the delivery conduit 5 engages, for axial sliding movement, with the sleeve 14 associated at a central location with the pumping member consisting of a flexible annular membrane 15. The sleeve 14 has a free end 16 intended for co-operation with a cam surface 17 fast with the lever 6, to operate the pumping member in the manner disclosed, for example, in the aforementioned European Patent Application. The radially outward, peripheral edge 18 of the membrane 15 is held by the inner wall of the head structure 4, where it engages in an annular groove 19 effective to inhibit any axial movement thereof. Associated with the membrane 15 is, in accordance with a preferred embodiment of the invention, a leaf spring.20. With reference in particular to Figures 2, 4 and 5, this leaf spring is ring-shaped so as to encircle the sleeve 14, whereon it engages against a peripheral ridge 21. The opposed terminating portions 22 and 23 engage against the inner wall of the structure 4 in the groove 19, for the necessary reaction. The dispensing head portion facing the top end 24 of the container 1 has a tubular extension 25 formed with a threadway 26 on its inside. This extension 25 duplicates the peripheral contour of the top end 24 of the container 1, which end is provided with a mating threadway 27. The mutual engagement of the threadways 26 and 27 provides a releasable connection between the dispensing head 2 and the container 1. The mating threadway 27 is, in particular, used for attaching a cover 28 which imparts, to the container 1 prior to its use in combination with the head 2, the appearance and function of a refill container. The advantages and merits of a dispenser according to this invention should be apparent from the foregoing description and illustration of its operation. After the amount of the product supplied in the container on first purchase of a complete dispenser has been depleted, the user may separate the container 1 from the head 2 and replace it with a fresh container while saving the head itself, which evidently constitutes the most expensive portion of such a dispenser unit, with obvious benefits from the economic standpoint. The leaf spring 20 is contributive toward an extended working life of the head, and where a non-elastomer material is used in the construction of the membrane 15, also to provide the required elastic bias for the membrane.

Claims: A dispenser of paste products, particularly of toothpaste, comprising a tubular container (1) having a vertical lengthwise axis, a hollow dispensing head (2) located on the top end of the container, a bottom wall (1a) slidably movable inside the container in tight relationship therewith in one direction toward the head, a pumping member (15) placed near the top end (24) of the container, a sleeve (14) having one end (16) free and the opposite end associated with the pumping member (15), an actuating lever (6) for pressing the pumping member (15), said lever being mounted on said head and movable from a home position to a product dispensing position, a delivery conduit (5) having an inlet port (12) and an outlet port (11) and being mounted rigidly in the head, said actuating lever being provided with a cam profile (17) for engagement with said free end (16) of the sleeve, said delivery conduit (5) being axially slidably connected to said sleeve (14) through its inlet end, said pumping member (15) comprising a flexible annular membrane with a radially outward edge (18) and an inward edge, the latter edge being connected to said sleeve, whereas the outward edge (18) is held axially fixed to the hollow dispensing head at a location close to a tubular extension (25) facing the top end (24) of the container (1), said tubular extension being shaped to match the outward contour of said top end, characterized by the fact that said extension (25) has an inner wall provided with means (26) of detachable connection to said top end (24) of the container, the latter being provided, in turn, with respective matching means (27), and in that said head includes an elastic bias means (20) acting on said pumping member (15) against the push force applied by said actuating lever (6). A dispenser according to Claim 1, characterized in that said elastic bias means comprises a leaf spring (20) encircling said sleeve (14) associated with the pumping member and being connected thereto, the opposed free ends (22,23) of said leaf spring being engaged with the inner wall of said hollow head.

Inventors: BATTEGAZZORE PIERO, BATTEGAZZORE, PIERO
Applicants: GUALA SPA, GUALA S.P.A.
Application year: 1990
Main classification: B65D83
IPC codes: B65D83