Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material
Patent
1998-03-27
2000-08-29
Walczak, David J.
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including means to advance material
401 80, B43K 2108
Patent
active
061098086
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention concerns the packaging industry and more particularly it concerns cases for storage and manipulation of sticks of pasty or friable material which are to be applied by rubbing onto a solid surface, such as lipstick or another cosmetic, makeup pencils, marking pens, medicated sticks, or adhesive stocks.
BACKGROUND OF INVENTION
Cases have ordinarily been used for a long time in which the stick is maintained by its base in a cup-slider which is slid axially, as needed, in order to make the free end of the stick come out of the case or to return it there. This sliding can be brought about simply by moving with a finger a lateral push button that is connected to the cup-slider and that projects outward from a longitudinal slit in the case. But most often, one uses a rotary mechanism with two cooperating concentric tubes, respectively hollowed with two spiral grooves, in one case, and in the other case, with two longitudinal slits reciprocally passed through by two radial pins connected to the cup-slider.
The customer appreciates a smooth and regular operation of the rotating mechanisms, which implies minimal play between the moving elements and a controlled force of displacement. The unavoidable mechanical tolerances of the industrially molded parts which generally constitute all or almost all of the elements of these mechanisms do not allow these objectives to be fully attained. Braking devices, with or without compensation for play, are therefore used. Numerous devices have been proposed with radial braking runners inserted between the two tubes, such as those described in the French Patents Nos. 1,417,277, 2,657,238, 2,670,998, which can provide suitable braking and good centering of the tubes, but which have no effect on the axial play, which is much more difficult to control than the diametral play. In order to compensate for the axial play, cylindrical groove-frustrum-shaped circular rib assemblies have been proposed, as in the French Patent No. 2,169,557, which can provide good axial fixing but without elasticity, therefore to the detriment of the regular and smooth manipulation of the mechanism.
SUMMARY OF INVENTION
The aim of the invention is a rotating mechanism which does not have the disadvantages of the prior mechanisms, and which is reliable, has a regular and smooth functioning suited to the needs of industrial manufacturing and assembly, and which is inexpensive.
The invention concerns a case for lipstick and similar materials with respectively rotating concentric tubes with axial movement of a cup-slider which bears a stick of pasty substance, of the type which has a device for braking with respect to rotation and compensation for axial play between the tubes consisting of a flange, added on or not, connected to the base of the internal tube and having at least one flexible extension which bears elastically against the edge of the base of the external tube, characterized by the fact that the tubes are connected together by nonlocking mutually corresponding catches near the flange-internal tube connection.
The flange can be an added part fastened to the internal tube by a catch, or by gluing, welding or force-fitting.
It advantageously has a cross section in the form of a U, V, or W, one lateral arm of which is flexible and possibly toothed.
In order to produce sealed cases, the flange, or the internal tube, has a solid bottom.
The assembly of the mechanism with an exterior envelope is facilitated if the flange, or the internal tube has an axial tubular part, of which at least the lower end is open, for receiving the tube cap of a decorative envelope for the case.
In one embodiment, the top of the external lateral wall of the flange has overlying elastic arches.
In a variant, the flange is in the form of a ring surrounded by teeth parallel to the axis, whose free ends are joined by elastic arches.
According to another embodiment, the base of the flange with a cross section in the form of a curved U is connected to a tubular extension of the base of
REFERENCES:
patent: 2333889 (1943-11-01), Ruekberg
patent: 2444376 (1948-06-01), Seaver
patent: 2840229 (1958-06-01), Hopgood
patent: 4812066 (1989-03-01), Gueret
patent: 5096318 (1992-03-01), Susini et al.
patent: 5234275 (1993-08-01), Gueret
patent: 5348410 (1994-09-01), Shozi et al.
Lecomte Olivier
Susini Claude
Reboul, Rexam
Walczak David J.
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