FR2522579A1 - Mould tool for dishes with deep undercut lip - for strong one piece dishes for industrial chicken feeders - Google Patents

Abstract

Mould for making a dish with an undercut lip and a tall centre, as used for feeding fowl, has a cavity tool (9) combined with a cover tool (10) where the latter carries a group of (six) segments (20) which can contact radially to disengage the rim of the moulding to allow the tool to part. Arrangement allows the dish to be injection moulded in one piece, with smooth surface profiles, instead of by assembling components requiring a circumferential or diametric weld with associated disfigurement and weakness.

Description

Technical area.

 The present invention relates to an improvement in molds for the manufacture of plates of periodic automatic feeding devices, in particular for poultry, and more generally for the manufacture of molded cups comprising a central prominence and a border turned inward. It also relates to molded plates, and more generally molded cups having a central prominence and an inwardly turned edge made with the mold of the invention.

Posted problem.

 It is a question of finding an interesting means of manufacture for the plates of apparatuses of automatic periodic feeding for poultry where the food is brought by the center and is scattered at the periphery thanks to a relatively high central cone. These plates have a border turned inward and intended to prevent the projection of food products outside the plate when the animals peck at them.

State of the art and disadvantages.

 So far, these plates are made in two ways.

 The first consists in making them come by stamping or flow forming from a galvanized sheet.

This process is relatively slow and expensive. The plates obtained corrode relatively quickly in the basic atmosphere of chicken coops.

 The second way is to make these plates in a molded material. However, the form cannot be removed from the mold by conventional methods with the usual injection molds. This is why, we are obliged to make the plate in two parts separated by the meridian circle at the level of which a bonding or welding is practiced.

This assembly weakens the whole and we observe broken plates. In addition, this process requires labor, an additional operation and is expensive. Plates molded in plastic material, however, have the advantage over plates made of sheet steel by flow spinning, having smooth edges or edges. Indeed, the flow forming implies an undulation of the edges since the metal length is shorter there.

 The present invention is intended to remedy these drawbacks.

Statement of the invention-
The mold of the invention is characterized in that it is divided into two parts separated by a horizontal seal, the corresponding part above the plate having a lateral bulge intended to slide under the border, said bulge being radially retractable by a value equivalent to the width of the border thanks to a mechanism which frees the central area of the upper part of the mold.

 More specifically, the lateral bulge is composed of articulated segments at the end of the arms thinner than each segment and arranged alternately above, then below, the arm relative to the neighboring segment, each arm articulation whose axis is parallel to that of the mold and of the plate being transferred to the vicinity of the adjacent segment in a position as distant as possible from the axis of the mold and allowing, in conjunction with the shape and structure of each segment end, the reciprocal release of each segment and its fold back towards the center, all the segments being actuated simultaneously by an appropriate mechanism, the segments and the mechanism being placed in an annular groove in the mold, said groove being open towards the periphery.

 To properly release and clear the central area of the upper part of the mold, it is necessary to imagine a particular guide system for the segments. In particular, it is necessary to provide a relatively compact arrangement of the arms.

For this purpose, the segment support arms located above are articulated on pins embedded in the upper part of the groove, while the segment support arms located below are articulated on pins embedded in the lower part of the groove. groove, the upper and lower walls of the groove being able to be separated and separated, by virtue of an arrangement in two parts separable by a horizontal point to allow and facilitate mounting.

 To meet the requirements for clearing the central part, it is still necessary to find an arm actuation mechanism which acts from the periphery.

For this, the segments are actuated simultaneously thanks to a lug relative to each of them stengaging in an oblique buttonhole of a crown concentric with the mold, said crown having a toothed sector meshing with a control pinion to cause said crown to oscillate in a either way and operate the segments upon expansion or withdrawal.

 If the segments retract towards the center of the mold, they come into a smaller space so that, in order to be able to achieve this attraction, they must be placed at an angle and in addition have a shortening device. This necessary shortening of the segments during their withdrawal movement is ensured by a cap whose exterior is level with the segment, having thin walls and situated at one end of each segment, said cap being constantly pushed backward. sion by a spring towards the neighboring segment and having upper and lower edges rounded and concentric with the axis dtartlculation of the arm of the corresponding segment.

Advantageous industrial result.

 The mold of the invention makes it possible to obtain molded plates comprising a central cone and an edge turned inward in a single molding operation with great speed. This molding can be carried out in any plastic material chosen for its resistance to the medium in which it will be placed, in particular its resistance to chemical attacks. The plate is made in a single operation, is not fragile and its cost price is interesting.

 The invention will be better understood with the aid of the description below, which gives a nonlimiting example of the production of the mold. This description is illustrated by the accompanying drawings.

Brief description of the figures.

In these drawings
Figure 1 is a perspective view of the kind of plate to be made by the mold of the invention.

 Figure 2 is a vertical diametrical cross section of the plate of Figure 1.

 Figure 3 is a vertical diametrical cross section of the mold of the invention in the closed position ready for injection of the material.

 FIG. 4 is a section along I-I of FIG. 3.

 FIG. 5 is a section along II-II of FIG. 6.

 Figure 6 is a diametrical vertical cross section of the two parts of the mold which have just separated after molding a plate.

 FIG. 7 is a section along III-III of FIG. 3.

 Figure 8 is a section on IV-IV of Figure 6.

 FIG. 9 is a partial cross-section of a segment along V-V in FIG. 4.

 Figure 10 is a partial cross section of the same segment along VI-VI of Figure 5, c 1est - # - say in the release position.

Description of an exemplary embodiment.

 The mold of the invention is intended to manufacture the plate (1) comprising a central frustoconical prominence (2) the base of which extends up to a sort of circular gutter (3) surmounted towards the outside by a bulge in the form of a molding (4) ending in an edge (5) turned inward, the edge (6) having a diameter greater than the limit (7) between the top of the circular gutter (3) and the bulge ( 4). This results in a groove (8), the opening of which faces the prominence (2).

 To make this type of plate by molding, a mold shown in FIGS. 3 to 10 is used, which is designed for the injection of synthetic resin such as, for example, acrylonitrile-butadiene-styrene (ABS).

This mold is composed of a lower part (9) and an upper part (10) separated by a horizontal joint (ll) comprising a conventional device for positioning the two parts (9) and (10) formed in relative position, for example, by tenons (12) with trapezoidal or frustoconical section integral with the part (10) fitting into mortises of corresponding shapes of the part (9).

 The lower part (9) has a shape corresponding to the lower part of the plate (1). It comprises, conventionally, ejection pushers (13) intended to lift the plate (1) which will have been molded after the opening of the mold by an upward movement materialized by the arrow (14). It also includes injection pipes (15), (16) through which the material to be molded is introduced (according to the arrows (17), (18)).

 Note that the lower part (9) has a central protrusion (9) rising widely above the joint plane (II), which will require special arrangements of the upper part (10), as will be explained below.

 The upper part (10) has a lateral bulge (20) intended to slide into the interior of the groove (8), under the edge (5) to produce the shape of the plate represented in FIGS. 1 and 2. For allow the upper part (10) to be disengaged upwards, it is necessary to provide a radial retraction device for the bulge (20), the value of the dimension of the radius of this bulge being equivalent to the width of the border ( 5). The retraction movement of the bulge (20) is constituted by a mechanism which releases the central zone (21) of the upper part (10) which must receive the central prominence (19) of the lower part (9), as is clearly seen in Figures (3) and (6).

 For this, the lateral bulge (20) is composed of segments (221) to, (226) articulated in (231) to (236) at the end of the arms (241) to (246) which are thinner than the segments (221 ) to (226). their thickness is less than half the thickness of the segments (221) to (226).

The arms of the odd segments are anchored to the lower part of said segments and the corresponding joints (231), (233), (235) are formed by lugs embedded in the floor (25) of the annular groove (26) which is open. towards the periphery of the upper part (10) of the mold. On the other hand, the arms of the even segments are articulated on lugs (232), (234), (236) embedded in the ceiling (27) of the annular groove (26) and said arms are connected in the upper part of the segments (222), (224), (226). There is therefore an alternative possible overlap of the arms relating to two successive segments.

 To carry out the assembly, the upper part (10) of the mold can be separated in two along a joint plane which is materialized in (28). The two sections of the part (10) are assembled by screws (not shown) which are introduced from above the upper part (10).

 Each articulation (231) 3 (236) is transferred, as can be seen, in the vicinity of the adjacent oath, in a position as distant as possible from the vertical axis of the mold and the plate to allow, in conjunction with the form and the structure of each end of segments (221) to (226), the disengagement of these and their folding towards the center, as indicated in FIGS. 4 and 5. As can be seen, the movement of folding towards the center is favored by a rounded and inclined shape of all the ends of the segments which rub against each other. However, the retraction on the center requires a shortening of each segment thanks to a device which is shown in Figures 4, 5, 9 and 10.

 This device consists of a cap (291) to (296) which has the same external thickness as the corresponding segment (221) to (226) and which has relatively thin walls (30), (31). The caps (291) to (296) are placed at one end of each segment (221) to (226); they are constantly pushed back in lensionension towards the neighboring segment by a helical spring (32) which is housed in respective cylindrical holes of the segment and of the cap. The edges (331) to (336) of each cap (291) to (296) are adjusted in a corresponding counterbore of the segment, the edge (331) to (336) and counterbore being arched by having their centers concentric with the articulation axis corresponding (231) to (236). The reason for this provision will be explained later.

 The simultaneous movement of the segments (221) to (226) is ensured by means of a lug (341) to (346) relative to each of them, engaging in an oblique buttonhole (351) to (356) of a crown (36) concentric to the mold.

The rotational movement of the crown (36), in a corresponding annular groove (37) hollowed out in the upper part (10) of the mold in which said crown is guided, is ensured by a toothed sector (38), meshing with a pinion (39) wedged on an axis (40). It is understood that the rotation of the axis (40) along the arrow (41) in one direction or the other causes the crown (36) to oscillate in rotation in one direction and in the other so that the oblique button (351 ) to (356) act on the lugs (341) to (346) by forcing them to move away from or to approach the vertical axis of the whole mold, which corresponds to a withdrawal or an expansion of the segments (221) to (226) and therefore to an expansion or withdrawal of the lateral bulge (20) which can be placed at the bottom of the groove (8) or completely escape from the edge (6) of the plate.

 Referring to Figure 3, we see that the mold is arranged to be ready for injection of the plastic. The segments (221) to (226) are in the position shown in Figures 4, 7 and 9. The resin is injected according to the arrows (17) and (18) into the conduits (16) and (17) so that said resin fill all the free space left to him. Prior to demolding, action is taken on the axis (40) to rotate the crown (36) in the direction which brings the segments (221) to (226) closer to the axis of the mold. As during the previous molding, the usual burrs occurred at the junction of the molds and especially at the junction of the segments and their caps with the corresponding segment, it is necessary to provide edges (331) to (336) coaxial with the axes of rotation of the segments and a strong draft of the groove (8) to prevent said burrs from hindering the movement of the segments.

 After the segment removal movement has been carried out, the upper part (10) of the mold in FIG. 6) can be opened and the ejection pusher (13) raised to raise the plate (1) which has just been molded.

 The finished plate is recognizable by the fact that it has a slight burr at the location of its largest diameter at (42) and inside the groove (8) at the location of the segments and edges of the cap. (331) to (336).

Claims (6)

R CLAIMS  1. Improvement in molds for the reworking of plates (1) of automatic periodic feeding devices, in particular for poultry, and more generally for the manufacture of molded cups comprising a central prominence (2) and a border (5) turned inward, characterized by the fact that a two-part injection mold (9), (10) is used, separated by a horizontal seal, the part (10) corresponding above the plate , having a lateral bulge (20) intended to slide under the border (5), said bulge being retractable radially by a value equivalent to the width of the border (5) by means of a mechanism (221)> (224), (36), (40) which frees the central zone (21) from the upper part of the mold.  2. Mold, as defined in claim 1, characterized in that the lateral bulge (20) is composed of segments (221-226) articulated at the end of the arms (241-246) thinner than each segment and arranged alternately above, then below, the arm relative to the neighboring segment, each articulation (231-236) of arms whose axis is parallel to that of the mold and of the plate being carried in the vicinity of the adjacent segment in a position as distant as possible from the axis of the mold and allowing, in conjunction with the shape and structure of each segment end, the reciprocal release of each segment and its fold back towards the center, all the segments being actuated simultaneously by a mechanical appropriate (341-346, 221-226, 36, 40), the segments and the mechanics being placed in an annular groove (26) of the mold, said barley being open towards the periphery.  3. ovum, as defined in claim 2, characterized in that the arms (242, 244, 246) supporting the segments situated above are articulated on axes (232, 234, 236) embedded in the upper part of the groove (26), while the arms (241, 243, 245) supporting the segments situated below are articulated on axes (231, 233, 255) embedded in the lower part of the groove (26 ), the upper and lower walls of the groove (26) being able to be separated and separated, thanks to an arrangement in two parts separable by a horizontal joint (28) to allow and facilitate assembly.  4. Mold, as defined in claim 3, characterized in that the segments (221-226) are actuated simultaneously by a lug (341-346) relating to each of them engaging in a oblique buttonhole (351-356) of a crown (36) concentric to the mold, said crown (36) having a toothed sector (38) meshing with a control pinion (39) to oscillate said crown in one direction or in the 'other and activate the segments (221-226) on expansion or withdrawal.  5. Mold, as defined in claim 4, characterized in that the necessary shortening of the segments during their withdrawal movement is ensured by a cap (291-296) whose exterior is level with the segment, having thin walls (30), (31) and situated at one end of each segment (221-226), said cap (291-296) being constantly pushed back in extension by a spring (32) towards the neighboring segment and having upper (331-336) and lower edges rounded and concentric with the articulation axis of the arm of the corresponding segment.  6. Molded plates having a central prominence and an inwardly turned edge made with the mold as defined in any one of claims 1 to 5, characterized by the absence of gluing or welding and having no traces or burrs of molding only at its largest outside diameter (42) and inside the upturned edge (5) and under it.