Bayonet Coupling Between a Spray Pump and a Bottle of a Substance to Be Sprayed

The present invention relates to a bayonet coupling between a spray pump and a bottle of a substance to be sprayed.

Generally, the present invention relates to a bottle of a substance to be sprayed and to a spray pump fitted to the bottle. As is known, the spray pump is fitted to the bottle by means of a bayonet coupling, which allows the spray pump to be fitted axially onto the bottle in the course of its industrial manufacture, and similarly, of course, it allows the spray pump to be detached from the bottle once the spray substance has been used up, followed by application of the same spray pump to a refill bottle in the home.

Mire specifically, the present invention relates to a bayonet coupling between a spray pump and a bottle of a substance to be sprayed.

Although the bayonet couplings that are known and currently used are satisfactory in many ways and largely serve the purpose of securely connecting the spray pump and bottle together, they nonetheless have the disadvantage that, when industrially produced, there is a lack of uniformity in the angular relationship between the pump and the bottle.

This lack of uniformity gives the impression of poor quality of manufacture and sometimes also makes the spray pump/bottle unit awkward to manipulate during spraying.

The problem that forms the starting point of the present invention is how to devise a bayonet coupling of the specified type, whose structural and functional characteristics are such as to overcome the abovementioned disadvantages.

Other features and the advantages of the bayonet coupling according to the present invention will be made clear in the following description of a preferred embodiment thereof, which is given by way of non-limiting indication with reference to the accompanying figures, in which:

FIG. 1 shows a view in elevation and partial section of a bottle and of a spray pump fitted together by means of a bayonet coupling according to this invention,

FIG. 2 shows a view in elevation and partial section of a detail of the spray pump of FIG. 1,

FIG. 3 shows a view from beneath of a detail of the spray pump of FIG. 1, viewed in the direction of arrow III,

FIG. 4 shows a view in elevation of a detail of the bottle of FIG. 1,

FIG. 5 shows a view from above of the bottle shown in FIG. 1, viewed in the direction of arrow V, and

FIG. 6 shows a perspective view with parts detached of the bottle and spray pump shown in FIG. 1.

With reference to the attached figures, the numeral 1 is a general reference for a bottle of a substance to be sprayed, such as a liquid cleaning agent: if for sale as a first purchase, the bottle is intended to be fitted with a spray pump 2; or, if for sale as a refill bottle, the bottle is fitted with a stopper cap 3.

The bottle 1 and the pump 2 are flattened in form.

A bayonet coupling 4 and fixing means 5 are provided for connecting the bottle 1 to the pump 2 and to the stopper cap 3, respectively.

The bayonet coupling 4 comprises three teeth 6, which project in from a tubular sleeve 7 forming part of the pump and having axis X--X. The three teeth 6 are distributed evenly around the circumference and each has a given angular amplitude A. In this example A is 42.degree..

The teeth 6 are like tabs and can thus deform elastically. They extend away from a free edge 8 of the sleeve 7.

The bayonet coupling 4 also comprises three tooth catches 9, which project from a neck 10 forming part of the bottle 1, the said neck being with axis X--X.

The three tooth catches 9 are distributed evenly around the circumference and each has a given angular amplitude B, which is greater than A.

In this example B is 75.degree..

Each tooth catch 9 is designed to be engaged by one corresponding tooth 6 when the pump is fitted axially onto the bottle, during the industrial manufacture of bottles intended for a first purchase.

For this purpose, each tooth catch 9 comprises a sloping wall 11 that diverges with distance from the mouth 12 of the neck 10 and forms an approach surface for its respective tooth 6.

The bayonet coupling 4 comprises a funnel-like passage 13 formed in the bottle 1 at each tooth catch 9 for the respective tooth 6 to pass through when the pump is fitted axially onto the bottle.

The funnel-like passage 13 is defined by opposite flared side walls 14a and 14b projecting from the tooth catch 9 at the circumferential extremities 9a and 9b of the the tooth catch.

The funnel-like passage 13 presents an entrance aperture 18 having angular amplitude C greater than the angular amplitude A of the tooth 6 and an exit aperture 19 having angular amplitude D, which is slightly greater than the angular amplitude A of the tooth 6.

In this example, the angular amplitude C is 68.5.degree., while the angular amplitude D is 44.degree..

During axial fitting, when the tooth 6 passes over the tooth catch 9 and remains engaged by it, the tooth 6 is disposed in an exact given relative angular position with respect to the tooth catch, and the tooth 6 occupies a niche 20 formed in the neck between opposing inclined walls 21a and 21b that are formed on the neck.

In this way the pump and the bottle are positioned with respect to each other in a precise relative angular relationship.

Each tooth catch 9 is designed to disengage from its respective tooth 6, with the tooth 6 coming out of the niche 20, along an L-shaped path 23 formed in the neck, comprising a circumferential section 23a and an axial section 23b, when the pump is removed from the bottle once the spray substance has been used up.

In reverse, each tooth catch 9 on a refill bottle is designed to engage with the respective tooth 6 of the pump by following the L-shaped path in the reverse direction.

The means 5 by which the stopper cap 3 is fixed to the refill bottle 1 comprise a collar 24 formed on the neck over which an annular projection 25 formed in the stopper cap, and having a sloping wall 26, is intended to be snap-engaged, for the axial retention of the stopper cap on the bottle.

The fixing means 5 preferably also include a plurality of axial teeth 27, alternating with grooves 28, arranged circumferentially around the neck and intended to be engaged by a corresponding plurality of grooves 29 alternating with teeth 30 formed in the stopper cap, in order to prevent the stopper cap from rotating relative to the bottle.

In operation, during industrial manufacture, the bottle is fitted axially with either the pump or the stopper cap, depending on whether the bottle is for a first purchase or a refill bottle, respectively.

In operation in the home, the stopper cap is removed manually from the refill bottle and the bottle is fitted, in an L movement, with the pump, the latter having been removed with an L movement in the reverse direction from the used bottle.

In particular, when fitting the pump axially onto the first-purchased bottle, during industrial manufacture, it is possible that the bottle and pump reach the fitting station via different feed tracks with the bottle and the pump oriented differently with respect to the ideal orientation, with opposite orientations, and therefore in the wrong angular position relative to each other. In this situation, during axial fitting, one edge 6a or 6b of the tooth 6 will interfere with a flared side wall 14a or 14b of the bottle. As a result of the axial movement of the pump and bottle towards each other, the action of the flared side wall on the tooth will create a relative rotation which annuls the incorrect angular orientation.

The main advantage of the bayonet coupling according to this invention is that it enables industrial manufacture of bottles and spray pumps in a precisely uniform mutual angular relationship.

Another advantage of the bayonet coupling according to this invention is its constructional simplicity, which is no small advantage for a product produced on a very large scale.

It will be obvious that numerous modifications and alterations may be made to the bayonet coupling described above by a person skilled in the art in order to fulfill particular local needs, all such modifications and alterations remaining, however, within the scope of protection of the invention as defined in the following claims.