Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material
Reexamination Certificate
1999-10-25
2001-03-27
Hughes, S. Thomas (Department: 3726)
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including means to advance material
C029S413000, C029S434000, C029S469000, C029S527300
Reexamination Certificate
active
06206597
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a process for producing a stick-like implement, having a first sleeve, a second sleeve with an insertion section for insertion into the first sleeve, it being possible for the two sleeves to be rotated with respect to one another in the inserted state, having an externally threaded element which is coupled to the second sleeve in a rotationally fixed but axially displaceable manner and is designed to mesh with an internally threaded element which is coupled to the first sleeve in a rotationally fixed manner, with the result that rotation of the two sleeves with respect to one another results in an axial displacement of the externally threaded element in relation to the sleeves, and having a filler element which, in the case of corresponding axial displacement of the externally threaded element on account of rotation of the two sleeves with respect to one another, is pushed out of a sleeve opening.
Processes of the type mentioned in the introduction are known See U.S. Pat. No. 5,018,892. The known processes provide for the internally threaded element to be formed integrally with the first sleeve. This usually takes place in that the first sleeve is produced by injection molding using a mold with an external thread which corresponds to the internally threaded element. The production is thus comparatively complicated.
If the internally threaded element is not formed integrally with the first sleeve, but rather as a separate part, then it has to be introduced into the first sleeve, during assembly of the stick-like implement, in a process step provided specifically for this purpose. This solution also involves comparatively high outlay.
The object of the invention is to specify a process of the type mentioned in the introduction by means of which it is possible, in a straightforward manner, for the interior of the first sleeve to be provided with an internally threaded element.
SUMMARY OF THE INVENTION
The foregoing object is achieved according to the invention in that the second sleeve and the internally threaded element are inserted into the first sleeve as parts which are connected to one another, the connection of the second sleeve to the internally threaded element being such that it is released when the sleeves are rotated with respect to one another.
The invention is based on the finding that it is possible to eliminate a process step if the internally threaded element is introduced into the first sleeve during the step, which is necessary anyway, in which the second sleeve is inserted into the first sleeve. Since, according to the invention, the connection between the second sleeve and the internally threaded element is weak enough to be released when the two sleeves are rotated with respect to one another, those parts which are still connected to one another for the purpose of introduction into the first sleeve, namely the second sleeve and the internally threaded element, can be separated from one another following the insertion into the first sleeve, which is imperative for the functioning of the rotary mechanism provided in the stick-like implement.
It is thus not necessary according to the invention either for the internally threaded element to be introduced separately into the first sleeve or for an internally threaded element to be provided on the first sleeve itself.
The overall result is thus a considerable simplification of known processes for producing a stick-like implement.
The insertion into the first sleeve preferably takes place at least until the internally threaded element comes up against a stop within the first sleeve. It is then possible for the internally threaded element to be supported axially on said stop during the actual actuation of the rotary mechanism, this forming an abutment in order to push the filler element out through the sleeve opening.
The second sleeve and the internally threaded element are preferably produced as parts which are connected integrally to one another and have a predetermined breaking point as a connection between them. In the case of the second sleeve being produced by injection molding, the internally threaded element thus constitutes a part which is integrally formed on the second sleeve by injection molding.
The externally threaded element is preferably introduced into the second sleeve with the internally threaded element still connected thereto, it being the case that the internally threaded element can be changed in terms of its effective diameter and, upon introduction of the externally threaded element, is in an operating state in which it does not mesh with the externally threaded element. This configuration makes it possible for the externally threaded element to be introduced into the internally threaded element (which is still integral with the second sleeve) by straightforward axial displacement, without a screwing movement being required on account of the meshing of the two threaded elements with one another. This means that the insertion of the external element into the second sleeve with the internal element located thereon can be automated particularly easily.
It is preferably provided for the filler element to be fastened on the externally threaded element. This makes it possible, by virtue of the two sleeves being rotated with respect to one another, for the filler element not just to be pushed out of the sleeve opening but—by virtue of the rotation in the opposite direction—also to be drawn in again through the sleeve opening.
The fastening of the filler element on the externally threaded element preferably takes place by the molding-on operation. The molding-on operation makes it possible, on the one hand, to achieve a particularly intimate connection between the externally threaded element and the filler element. On the other hand, a process step is once again eliminated. This is because, if the filler element were not molded on, it would have to be produced in a first step and fastened on the externally threaded element in a second step.
According to the invention, the filler element is preferably molded onto the externally threaded element in that the externally threaded element is fitted on a mold and the filler-element material is introduced into the mold by means of a cannula which is introduced into a corresponding through-passage opening in the externally threaded element. This means that the working surface of the filler element is free of spurs.
The externally threaded element, with the filler element fastened thereon, is preferably located within the second sleeve when the second sleeve is inserted into the first sleeve. This achieves the situation where the filler element can be fastened on the externally threaded element without the first sleeve being in the way. The result of this is a further simplification of the production process.
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Griebel Ulrich
Roeder Georg
Winkler Wolfgang
Bachman & LaPointe P.C.
Hughes S. Thomas
Omgba Essama
Schwan Stabilo Cosmetics GmbH & Co.
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