DE2528903B2 - Process, injection-molded rolling ring and injection mold for the production of a rolling ring for curtain rails - Google Patents

Description

The invention relates to a method, an injection molded rolling ring and an injection mold for production a rolling ring for curtain rails according to the preambles of claims 1, 2, 6 and 10.

Roll rings injection-molded from plastic for curtain rails are already known. These rolling rings are the bearing body and the rollers stored in it produced in separate injection molds, and the Rolls are subsequently in a separate operation on an axis inserted into the bearing body placed and fastened by welding or pressing on this axis. It is also known that the To blow open the rollers on the journal, which is achieved by an annular expansion of undivided inner flanges of the Rolling is possible (DE-OS 21 00 369). But this requires the use of relatively expensive, stretchable Plastic material for the rollers. In addition, rollers and journals cannot give way out of the same Material, but the stub axles must be made of a harder plastic material. Otherwise, there is already a risk of shearing off when the rollers burst onto the bearing journals or inward deforming of the heads of the journals, which affects the running properties of the burst rollers inevitably has to deteriorate.

Due to the separate manufacture of the rolling ring parts of known rolling rings and their subsequent assembly the manufacturing costs for this mass-produced article are relatively high.

The invention is based on the object of a method and an injection mold in connection with to create a certain rolling ring construction, which allow the manufacturing costs of plastic significantly lower injection-molded rolling rings.

The object set is thereby achieved according to the invention with a method of the type mentioned at the beginning solved that in otherwise known manner bearing part and role in separate, one another aligned mold cavities in a common injection mold and injected at the same time when opening the common injection mold by pressing it axially the roller by means of a part of the injection mold on the journal formed on the bearing part be coupled together to form a finished rolling ring.

It is already known to have a closure cap that can be detachably attached to the neck of a plastic bottle with a nozzle mouthpiece rotatably mounted in the closure cap through a certain angular range in a common, multi-part and relatively complicated form to inject and at the same time then, when the mold is opened, a mutual limited rotational movement is formed interlocking interlocking connection (DE-AS 1163 527). The interlocking should go through The nozzle mouthpiece is pulled into the cap. The technical feasibility of this Connection by pulling in the nozzle mouthpiece must, however, be doubted, since one is provided for this purpose Pin at its end only a relatively small contact surface on the mouthpiece in the area of a dovetail Has recess. Because the side ring flange of the mouthpiece has a larger diameter has, a very large expansion of the wall of the cap in the area of their central passage opening. The forces required for this can be obtained from such a small pen hardly be exercised.

In contrast to this known method, the roles of the rolling ring are based on the invention the axle journals pressed on by parts of the injection mold. This is a completely safe process also no ring expansion of the rollers or squeezing of the stub axles is required, as the According to the invention, the journal of the injection-molded rolling ring is divided into individual locking lugs, which are can move resiliently against each other when pressing the roller, or because according to the invention on the Axle journals to be pressed on rollers have an inner flange which is divided into at least two annular sections which snap into an annular groove in the stub axle.

The method according to the invention has the great advantage that the collection of the in large number of items in Multiple injection molds produced items of a rolling ring, namely the bearing parts of the rolling ring and the rollers and their axes are not applicable. There is also no need for separate devices with which the individual parts need to be brought together and put together. The rolling ring is made in a single operation completely manufactured without any reworking of its parts would be required. When opening the injection mold finished rolling rings with rotatable rollers arranged on their bearing part are ejected.

The division of the bearing journals or the inner flanges of the rollers into individual resilient sections is a very important point of view because by this measure

me, relatively hard and cheap plastic material can also be used to manufacture the rolling rings. The journal or journals of the bearing part can advantageously be attached to his or her free end have a peripheral edge beveled to form a conical surface. The cone shape ensures that the rollers slide safely and evenly onto the axle journals.

The method according to the invention can be produced with multi-part injection molds according to the invention a symmetrically divided inner molded body to form the bearing body with the Have axle journals and at least one adjoining outer molded body to form the rollers and are further characterized in that the halves of the split inner molded body and those of the Outer molded body are movable to open independently of one another in opposite directions that the Inner opening of each roller formed by a cylindrical mold core penetrating the outer molding is, which is aligned with a journal formed in the inner molded body and with its inner end face the end face of this journal is limited, and that of a concentric one protruding into the outer molded body Sleeve is surrounded, which limits the front end face of the roller in the outer molded body and after open the halves of the inner molding to push it on the roller is axially displaceable on the stub axle on the mold core.

The individual parts of the injection mold can be made using a corresponding mechanical structure Injection mold with the installation of locking bolts and preload springs without difficulty in such a way that the desired relative movement of individual injection mold parts when opening the injection mold and the desired opening sequence of the individual molded parts can be achieved.

Each mold core of the injection mold can have a tapered end section. The two halves of the inner molded body of the injection mold can each have at least one projection to form a Have transverse slot in an enlarged head part of a journal of the bearing part of the rolling ring.

The injection mold can be used to produce Roiiringen, the bearing part of which is only fitted with rollers on one side be appropriately designed so that the bearing body of the rolling ring with the two axle journals and the rollers are formed coaxially at a distance in the same and symmetrically divided molded body and the mold cavities for the rollers are opposed by coaxial mold cores protruding into the mold body the mold cavities for the journals are sealed, and that on the mold cores the outer End faces of the roles delimiting coaxial sleeves are stored, which after the opening of the halves of the Shaped body for pushing the rollers onto the stub axles are axially displaceable.

Embodiments of rolling rings, which are produced according to a method are made according to the invention, and the essential parts of injection molds for implementation the manufacturing process explained in more detail. In detail shows

F i 5. 1 the side view of a first embodiment of a complete rolling ring;

F i g. 2 is a plan view of the rolling ring;

F i g. 3 shows a central cross section through the essential parts of an injection mold for producing a

Rolling ring according to FIG. 1 and 2, sectional plane along the line HI-III in Figure 4;

F i g. 4 one opposite FIG. 3 partial section rotated by 90 ° through the injection mold along the line IV-IV in Figure 3;

F i g. 5 shows a partial cross section through the injection mold along the line V-V in FIG. 4;

FIG. 6 shows a cross section corresponding to FIG. 3 through an injection mold for producing a second embodiment of a rolling ring;

F i g. 7 shows a section through the injection mold along the line VII-VII in FIG. 6;

F i g. 8 shows a partial cross section through the injection mold along the line VIII-VIII in FIG. 7;

Fig.9 is a side view of the castor Bearing part of a third embodiment of a rolling ring;

FIG. 10 shows a 90 ° rotated with respect to FIG Side view with a roll in section;

H shows a partial cross section through an injection mold for the production of a rolling ring according to Fig.9 and 10;

FIG. 12 shows a partial section through the injection mold along the line XII-XII in FIG. 11th

The F i g. 1 and 2 show a first embodiment of a plastic injection molded rolling ring 10, the has a bearing body 11, on which a bracket 12 for a curtain is formed, which is attached to one end of which has a closure part 13 which is used to close the retaining bracket 12 in a manner known per se W; ise via a lateral undercut locking pin 14 formed on the bearing body 11 can be pushed. An axle journal 15 and 16 is integrally formed on the bearing body 11 on both sides. the Axle journals 15, 16 have a widened head end, which is through a transverse slot 17 in two locking lugs 18 and 19 is divided, the outer edge of which is beveled to a conical surface 20 and which is resilient to Allow the center of the axle to be pressed in. A cylindrical roller 21 and 22 are mounted on each of these journals 15, 16 pushed on, the axle passage opening widened to a round recess 23 on the outside is the area in which the spring-loaded latching lugs 18 and 19 of the stub axles 15, 16 are located.

The rolling ring 10 with its rollers 21 which are rotatably and undetachably arranged on the axle journals 15 and 16 and 22 is made in a single injection molding operation in a common plastic injection mold. FIGS. 3 to 5 show sections through the most important parts of this plastic injection mold, which has an in two halves 24/1 and 24/2 divided inner molded body and two adjoining outer molded body 25 and 26 has. In the inner molded body 24 is the bearing part 11 of the rolling ring 10 with the retaining bracket 12 and with the two stub axles 15 and 16 and the widened and the conical surface 20 having locking lugs 18 and 19 molded. The end face of the journal 15 and 16 is tapered by the end face of the End portion 27 of a mold core 28 limited, which is passed through the outer molded body 25 and the central bearing opening of the roller 21 including the enlarged recess 23 limited, which is in the an outer molded body 25 is formed. While the rear end face of the roller 21 through the outer wall the halves 24/1 and 24/2 of the inner molded body is limited, the outer end face of the roller 21 limited by a concentrically pushed over the mandrel 28 sleeve 29, which is also the Outer molded body 25 penetrated.

In the same way, the outer molded body 26 is designed for molding the other roller 22. the The same parts are denoted by the same reference numbers, supplemented by an index line.

Like the sectional view of FIG. 3, offset by 90 °. 4 shows are the two Latching lugs 18 and 19 of the widened head end of the journal 15 and 16 through a transverse slot 17

ίο separated from each other, which are formed by corresponding projections in the two halves 24/1 and 24/2 of the inner molded body. The sectional view of FIG. 5 shows the cross-sectional shape of the two locking lugs 18 and 19 and the possibility that the locking lugs 18, 19, which are injection-molded from a sufficiently elastic plastic material, can be pushed inward so far that they no longer exceed the diameter of the stub axles 15 and 16.
As the figures clearly show, the cavities for the bearing body 11 with the journals 15 and 16 and the cavities for the rollers 21 and 22 of the injection mold are complete through the last end regions of the tapered end sections 27 and 27 'of the cylindrical mold cores 28 and 28' separated from one another, but are connected to a common plastic input channel via injection channels (not shown) and are manufactured in the same injection molding process. After completion of the injection molding process and sufficient solidification of the plastic parts, the inner molded body is first opened by pulling its two halves 24/1 and 24/2 apart, so that the journal 15 and 16 with their locking lugs 18, 19 and the bearing body 11 are laterally exposed, however, remain held in their position by the mold cores 28. Then the two sleeves 29 and 29 'are moved on the mold cores 28 and 28' in the direction of the bearing body 11 and the rollers 21 and 22 formed are pushed with their bearing openings onto the conical surfaces 20 of the locking lugs 18 and 19 of the journal 15 and 16. The locking lugs 18, 19 are pressed elastically into the transverse slots 17 so that they do not hinder the sliding of the rollers 21 and 22. After the rollers 21 and 22 have been pushed on, the locking lugs 18 and 19 spring into the recesses 23 on the end faces of the rollers 21 and 22, and the rollers 21 and 22 are locked onto the journals 15 and 16 and mounted on these journals so that they cannot be lost. The other parts of the injection mold, which is not shown in full, are then also opened, so that the fully formed rolling ring 10 falls out of the injection mold.

The F i g. 6 to 8 show sectional images through an injection mold which correspond to the sectional images in FIGS correspond, which, however, is used to produce a modified embodiment of a rolling ring. Of the Rolling ring differs from the embodiment according to FIGS. 1 and 2 in that the axle journals 30 and 31 of the bearing body 32 of the rolling ring do not have a widened head part with locking lugs, but rather are provided with an annular groove 33 at their rear end. The rollers 34 and 35 point to their inner end face two annular sections 36 and 37, which best from Fi g. 8 can be seen and for which recesses in halves 38/1 and 38/2 of the

h5 inner molded body are formed. By the way, is the Structure of the injection mold analogous to the structure of the injection mold according to FIGS. 3 to 5 so that on one Description of the others from FIGS. 6 to 8

apparent injection molded parts is dispensed with. After spraying and opening halves 38/1 and 38/2 of the inner molded body, the rollers 34 and 35 are axially on the journal 30 and 31 by means of the sliding sleeves 39 and 40 pushed until the sections 36 and 37 in the annular groove 33 of the stub axle 30 or 31 click into place. The injection mold is then fully opened so that the finished rolling rings can fail.

The F i g. 9 and 10 show a third embodiment a rolling ring 50, the bearing body 41 of which is arranged on one side with two spaced apart Rollers 42 and 43 is provided. The two rollers 42 and 43 are molded onto the bearing body 41 Axle journals 44 and 45 placed, which exactly like the journals 15 and 16 of the in the F i g. 1 and 2 Rolling ring 10 shown are formed and two separated from one another by a transverse slot 46 Have latching lugs 47 and 48 in a widened end section of the axle journals 44, 45. How out 10, the rolling rings 50 are mounted on a guide rail 49 protruding from a vertical wall pushed on, with both the upper roller 42 and the lower roller 43 in contact with the guide rail 49 comes, all of which have a profile that prevents the rolling rings from jumping off the guide rail 49 prevented.

The rolling rings 50 are made in one piece in an injection mold with molded body 51, the essential parts of FIGS. 11 and 12 can be seen. The injection mold with molded body 51 has a single molded body consisting of the two halves 51/1 and 51/2, in which the recesses for the bearing body 41, the axle journals 44 and 45 and also for the two rollers 42 and 43 are. The recesses are shown in FIGS. 11 and 12 with the same reference numerals as the resulting in them sections of the Fig. 9 and 10 apparent rolling ring 50. The original separation of the recesses for the rollers 42, 43 from the Recesses for the journals 44 and 45 are as in the two injection molds described above for the other embodiments caused by stepped mold cores 52 and 53, the coaxial to the journal recesses 44 and 45 protrude into the molded body 51 and on which also axially displaceable sleeves 54 and 55 are mounted, which are the end faces of the rollers 42 and 43 to be formed limit and after opening the molded body halves 51/1 and 51/2, the rollers 42 and 43 on the Slide on axle journals 44 and 45 until they over the locking lugs analogous to rollers 21 and 22 of the rolling ring version 10 click into place.

In addition 7 sheets of drawings

Claims (10)

Patent claims: 1. Process for the production of a rolling ring for curtain rails, which consists of a bearing part and at least one roller arranged rotatably on the bearing part and sprung onto an axle journal consists of an at least limited elastic deformable plastic, characterized in that that in otherwise known manner bearing part and role in separate, one on top of the other ι ο of the aligned mold cavities are injected simultaneously in a common injection mold and when opening the common injection mold by axially pressing the roller by means of a Part of the injection mold on the journal formed on the bearing part is together to form one finished rolling ring are coupled. 2. Injection-molded rolling ring with journal stubs formed on a bearing body, which have an end flange with a larger diameter than the rest of the journal, which engages in an inner groove of the pressed roller, produced by the method according to claim 1, characterized in that the end flange by at least one Transverse slot (17, 46) is divided in the axial direction of the axle journals (15, 16; 44, 45) on individual locking lugs (18, 19; 47, 48) (Figs. 2,9 and 10). 3. Rolling ring according to claim 2, characterized in that that the rollers (34, 35) pressed onto the axle journals (30, 31) jo have at least one two annular sections (36, 37) have subdivided inner flange, which in an annular groove (33) of the Engage the axle journal (30,31). 4. Rolling ring according to claim 2 or 3, characterized m> characterized in that the axle journal (15, 16; 30, 31) has at its free end a peripheral edge bevelled to a conical surface (20). 5. Rolling ring according to one of the claims 2 to 4, characterized in that its bearing body (41) is provided on one side with two mutually parallel bearing journals (44, 45) with rollers (42, 43) pushed on and spaced apart from one another (Figs. 9 and 10). 6. Injection mold for producing a body provided with rollers, in particular a rolling ring according to the method according to claim 1 and with features of at least one of claims 1 to 4, characterized in that it has a symmetrically divided inner molded body (24/1 and 24/2) for formation of the bearing body (U) with the journal (15, 16) and at least one adjoining outer molded body (25, 26) for forming the rollers (21, 22) that the halves (24 / 1.24 / 2) of the divided inner molded body and the outer mold body can be moved independently of one another to opposite sides for opening, so that the inner opening of each roller (21 , 22) is formed by a cylindrical mold core (28, 28 ') which penetrates the outer mold body (25, 26) and which has a journal formed in the inner mold body (15, 16) is aligned and with its inner end face delimits the end face of this axle journal (15,16), and that of a concentric one protruding into the outer molded body (25, 26) Sleeve (29, 29 ') is surrounded, which limits the front face of the roller (21, 22) in the outer molded body (25, 26) and after opening the halves (24/1, 24/2) of the inner molded body to press the roller is axially displaceable on the journal on the mandrel (28,28 '). 7. Injection mold according to claim 6, characterized in that each mold core (28, 23 ') has one having tapered end portion (27) 8. Injection mold according to claim 6, characterized in that the two halves (24 / 1.24 / 2) of the inner molded body each have at least one projection for forming a transverse slot (17) in the end flange of a journal (15, 16). 9. Injection mold according to one of claims 6 to 8, characterized in that the cylindrical mold cores (28, 28 ') serving to form the inner opening of the rollers (21, 22) in their inner end portion (27, 27') over their entire circumference on the halves (24/1, 24/2) of the inner molded body. 10. Injection mold for producing a rolling ring with the features according to claim 5 and according to the method according to claim 1, characterized in that the mold cavity for the bearing body (41) with the two axle journals (44, 45) and the rollers (42, 43) is formed coaxially at a distance in the same and symmetrically divided molded body (51) and the mold cavities for the rollers (42, 43) by coaxial mold cores (52, 53) protruding into the molded body (51) opposite the mold cavities for the journals (44, 45) ) are sealed, and that on the mold cores (52, 53) the outer end faces of the rollers delimiting coaxial sleeves (54, 55) are mounted, which after opening the halves (51/1, 51/2) of the molded body to press the Rollers (42, 43) on the axle journals (44, 45) are axially displaceable.