MXPA99011020A - Process for producing a stick-like implement - Google Patents

Abstract

A process for producing a stick-like implement, having a first sleeve, having 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 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. 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.

Description

PROCEDURE TO PRODUCE A TOOL WITH ASPECT OF VARA DESCRIPTIVE MEMORY The invention relates to a method for producing a rod-like tool, having a first sleeve, having a second sleeve with an insertion section for its section of the first sleeve, it being possible for the two sleeves to be rotated one with with respect to another in the inserted state, having an externally threaded element that is coupled to the second sleeve in a rotationally fixed but axially displaceable manner and is designed to engage with an internally threaded element that engages the first sleeve in a rotationally fixed manner, with the result that the rotation of the two sleeves one with respect to the other causes an axial displacement of the threaded element externally in relation to the sleeves, and having a filling element which, in the case of the corresponding axial displacement of the threaded element externally due to the rotation of the two sleeves one with respect to another, is pushed out of an ab Cuff sheath. Processes of the type mentioned in the introduction are known. Known processes make it possible for the threaded element to be formed internally integrally with the first sleeve. This usually takes place in the sense that the first sleeve is produced by injection molding using a mold with external thread corresponding to the internally threaded element. 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 the tool-like assembly of the rod-like tool, in a process step provided specifically for this purpose This solution also involves a comparatively high outlay. The object of the invention is to specify a method of the type mentioned in the introduction by means of which it is possible, directly, so that the interior of the first sleeve of an internally threaded element is provided. The object established according to the invention is achieved in the sense that the second sleeve and the threaded element are internally inserted into the first sleeve as connecting parts to one another, the connection of the second sleeve being to the internally threaded element that is released when the sleeves are rotated one with respect to another. The invention is based on the finding that it is possible to eliminate a step of the process if the threaded element is inserted internally into the first sleeve during the passage, which is necessary in any way, 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 sufficiently weak to be released when the two sleeves are rotated with respect to each other, those parts which are connected can be separated from one another. still one with another for the purpose of entering the first sleeve, ie the second sleeve and the internally threaded element, immediately after the insertion to the first sleeve, which is imperative for the operation of the rotary mechanism provided in the rod-like tool. It is thus not necessary according to the invention that the threaded element is inserted internally into the first sleeve separately or that a threaded element is provided separately on the first sleeve itself. The overall result is thus a considerable simplification of the known methods for producing a rod-like tool. The insertion into the first sleeve preferably takes place at least until the internally threaded element reaches a stop within the first sleeve. It is then possible for the threaded element to be axially supported internally on said stop during the actual operation of the rotary mechanism, this formed an end in order to push the filler food out through the sleeve opening. The second sleeve and the internally threaded element are preferably produced as parts that are integrally connected to one another and have a predetermined breaking point as a connection therebetween. In case the second sleeve is produced by injection molding, the internally threaded element thus constitutes a part that is integrally formed on the second sleeve by injection molding. The threaded element is preferably inserted externally to the second sleeve with the internally threaded element still connected thereto, the case being that the threaded element can be changed internally in terms of its effective diameter and, with the introduction of the externally threaded element, is found in an operation state in which it does not splice with the threaded element externally. This configuration makes it possible to introduce the threaded element externally to the internally threaded element (which is still integrated by the second sleeve) by direct axial displacement, without requiring screwing movement due to the joining of the threaded elements with each other. This means that the insertion of the external element to the second sleeve with the internal element located on it can be automated in a particularly easy manner. It is preferably provided that the filler element is held on the threaded element externally. This makes it possible, in view of the fact that the two sleeves are rotated with respect to each other, that the filler element is not only pushed out of the sleeve opening but that - by virtue of the rotation in the opposite direction - it is also pulled inward again through the sleeve opening.

The clamping of the filler element on the externally threaded element preferably takes place by the molding operation. The molding operation makes it possible, on the other hand, to achieve a particularly intimate connection between the externally threaded element and the filler element. On the other hand, a procedure step is eliminated once more. This is because, if no enzyme was molded, the filler element would have to be produced in a first step and fastened on the threaded element externally in a second step. According to the invention, the filler element is preferably molded on the threaded element externally in the sense that the threaded element is externally fitted on a mold and the material of the filler element is introduced into the mold by means of a cannula which is inserted into the mold. the corresponding passage opening in the externally threaded element. This means that the working surface of the filler element is free of mold sprues. This externally threaded element, with the filler element clamped thereon, is preferably located within the second sleeve when the second sleeve is inserted into the first sleeve. This achieves the situation in which the filler element can be held on the threaded element externally without disturbing the first sleeve. The result of this is a further simplification of the production process.

The invention is explained in more detail hereinafter by means of a preferred exemplary embodiment and with reference to the accompanying drawings, with further details, in which: Figure 1 shows an axial sectional view of a tool having the appearance of rod that is produced in accordance with a preferred exemplary embodiment of the method according to the invention, Fig. 2 shows a cross-sectional view along the line AA in the figural, and Fig. 3 shows a schematic sectional view of a mounting operation. The accompanying figures show a rod-like tool with a handle 10 that has been assembled with a support part 12, an insert section 14 extending from the support part 12 to the handle 10. The support part 12 can be rotated. with respect to the handle 10. The drawings do not illustrate devices, such as snap action ends or the like, which retain the insertion section 14 in the handle 10. A mount of the filler element 16 is disposed within the support portion 12 and the handle 10. It has an external thread 18. Furthermore, it is provided with a guide part 20, the function of which will be explained in more detail later. Molded on the filler element mount 16, at the end of which is located opposite the guide part 20, is a filler element 22 that extends in some way to the mount of the filler element 16. In the case illustrated in figure 1, the external section 24 of the support part 12, said end section is misdirected away from the filler element 22, is connected to the rest of the support part 12 through a predetermined break point 26. It has a internal thread 28 which is designed to engage with the external thread 18 of the filler element mount 16. As can be inferred from FIG. 2, the accessory 24 has therein provided with a groove 32 extending in the axial direction. In this case, the support part 12, with the accessory 24 originally located thereon, is configured in such a way that those regions of the accessory 24 which are separated from one another by the slit 32 are previously subjected to stress in the direction of opening. The function of the pre-stress subjection in the opening direction will be explained later in more detail. The accessory 24 and the handle 10 have the shoulders 34, 36 which correspond to each other and limit the amount in which the accessory 24 is pushed to the handle 10. In addition, the accessory 24 and the handle 10 have ribs, of which two, by way of example, they have the designations 38 and 30, respectively, in Figure 2. The ribs 38, 30 serve to prevent the accessory 24 and the handle 10 from rotating with respect to each other. The support part 16 is provided with a longitudinal channel 40.

At its filler element end, the support part 12 has an opening 42. The opening 42 can be sealed by means of a protective cap (not illustrated in the drawings). The rod-like tool illustrated in the drawings is preferably produced according to the invention as follows: In a first step, the filler element mount 16 is pushed to the support part 12, from the side opposite to the opening 42, until the filler element mount 16 protrudes from the opening 42 through its end which is located opposite the guide part 20. In this state, it is placed on a mold 44, which has a corresponding recess 46 to the filler element to be molded. This process step is illustrated in FIG. 3, the elements 10, 16 and 20 being represented only schematically. A cannula (not illustrated in the drawings) is then inserted into the cavity 46 through the longitudinal opening 40 and the material of the filler element is introduced into the cavity 46 through the cannula. Once the filler element material has sufficiently solidified, the filler element mount 16 is pulled back, with the filler element 22 molded thereon, into the support part 12. Both with this traction operation behind as with the previous operation of pushing the filler element mount into the retaining part 12, those regions of the fitting 24 which are separated from each other by the groove 32 extend to each other, to such an extent that the internal diameter of the thread internal 28 on the fitting 24 is larger than the external diameter of the thread 18 on the filler element mount 16, with the result that it is possible to push inward and pull back, without having to rotate the filler element mount 16 in relationship with the support part 12, due to the splicing threads. This means that the push-in operation and the pull-back operation are particularly direct. In the next step, the support part 12, with the filler element mount 16 inserted therein, is inserted into the handle 10 until the entire arrangement is in the state shown in Figure 1. In this state, the stop 34 of the accessory 24 collides with the stop 36 of the handle 10. In the extended state, ie when the slit 32 is open, the external diameter of the accessory 24 is somewhat larger than the internal diameter of the handle 10. That means that the accessory 24 is it compresses when it is inserted into the handle 10, as a result of which the slit 32 is closed. In that compressed state, the internal diameter of the fitting 24 is such that it butts with the thread 18 on the filler element mount 16. The frame is attached of filler element 16 and support part 12 to each other in terms of rotation. The rotary coupling between the support part 12 and the filler element mount 16 is performed in the same manner as the rotary coupling of the handle 10 and the accessory 24, that is to say by means of ribs corresponding to the ribs 38, 30.

Instead of ribs, it is also possible to use rotationally non-symmetrical contours, for example using a polygon, as a means of impeding rotation. If it is then rotated, in the operating state shown in Figure 1, the support part 12, with respect to the handle 10, then the accessory 24 rotates with the handle 10 because of the ribs 38, 30. This results in that the predetermined breaking point 26 is broken. Once the predetermined breaking point 26 has been broken, the fitting 24 constitutes an internally threaded element which, together with the handle 10, rotates with respect to the support part 12, as a result of which the filler element mount 16 is pushed, with the filler element 22 located thereon, out of the aperture 42 to the left in the axial direction in figure 1. Together with the filler element 22, the part of guide 20 also moves to the left in the axial direction in figure 1said guide part serving during this axial movement to prevent the radial inclination of the filler element mount 16 and the filler element 22. The characteristics of the invention set forth in the foregoing description, the claims and the drawings can be essential both individually and in any desired combinations for the purpose of realizing the various embodiments of the invention.

Claims (8)

NOVELTY OF THE INVENTION CLAIMS

1. - A method for producing a rod-like tool, having a first sleeve (10), having a second sleeve (12) with an insertion section (14) for insertion into the first sleeve (10), it being possible for the two sleeves (10, 12) are rotated with respect to each other in the inserted state, having an externally threaded element (16, 18) which engages the second sleeve (12) in a rotationally fixed but axially displaceable manner and is designed for splicing with an internally threaded element (24, 28) that is coupled to the first sleeve (10), in a rotationally fixed manner, with the result that the rotation of the two sleeves (10, 12) with respect to one another causes an axial displacement of the threaded element externally (16, 18) in relation to the sleeves (10, 12), and having a filler element (22) which, in the case of the corresponding axial displacement of the externally threaded element (16, 18) to cause of rotation of the two sleeves (10, 12,) one with respect to another, is pushed out of the sleeve opening (42), characterized in that the second sleeve (12) and the internally threaded element (24, 28) are inserted to the first sleeve (10) as connecting parts to one another, the connection of the second sleeve (12) being to the internally threaded element (24, 28) such that it is released when the sleeves (10, 12) are rotated one with respect to the other.

2. The method according to claim 1, further characterized in that the insertion into the first sleeve (10) takes place at least until the internally threaded element (24, 28) reaches the stop (36) inside the first sleeve (10)

3. The method according to claim 1 or 2, further characterized in that the second sleeve (12) and the internally threaded element (24, 28) are produced as parts that are integrally connected to each other and have a point of determined break (26) as a connection between them.

4. The method according to one of the preceding claims, further characterized in that the threaded element is inserted externally (16, 18) to the second sleeve (12) with the internally threaded element (24, 28) still connected to it, being the case that the threaded element can be changed internally (24, 28) in terms of its effective diameter and, with the extension of the externally threaded element (16, 18), it remains in an operating state in which it does not butt with the element threaded externally (16, 18).

5. The method according to one of the preceding claims, comprising the step of holding the filler element (22) on the threaded element externally (16, 18).

6. - The method according to claim 5, further characterized in that the clamping takes place by shaping the filler element (22) on the externally threaded element (16, 18).

7. The method according to claim 6, further characterized in that the threaded element is externally disposed (16, 18) on the mold (44) and the material of the filler element is introduced into the mold (44) by means of a cannula. which is inserted into a corresponding passage opening (40) in the externally threaded element (16, 18).

8. The method according to any of claims 4 to 7, further characterized in that the threaded element (16, 18), with the filler element (22) fastened thereon, is located inside the second sleeve (12) when the second sleeve (12) is inserted into the first sleeve (10).