NL1004090C2 - The manufacture of plastic drain inspection hoppers - Google Patents

Abstract

A product, preferably an inspection or repair hopper with inlet and outlet openings, in particular for a sewage or drainage tube system, has two openings at a pre-determined angle to each other. This is produced in a two part mould, each provided with means to form the openings. The inner part has at least two independently movable sections to form the angle between the openings. Also claimed is a manufacturing method and the product using the mould described above.

Description

DIE FOR MANUFACTURING A PRODUCT

The invention relates to a mold for the manufacture of a product with a first opening and a second opening at a predetermined angle relative to it, preferably an inspection / repair shaft or well with an inlet and an outlet opening, in particular for a sewage or drainage pipe system, which mold is provided with an inner and an outer mold, each with 10 means for forming the openings. Although the product manufactured with the mold is preferably made of plastic, in particular combinations of plastic with other materials (preferably concrete), or even only concrete, are also possible. In the following, we will discuss plastic below, although this is not meant to be restrictive.

Such a mold is generally known. In the known mold, the aforementioned means are formed by openings arranged in pairs in the outer and inner mold and aligned in pairs, in which an insert can each be arranged. The prior art mold uses, for example, an injection molding technique, in which liquid plastic is injected under high pressure into the space between the outer and inner mold. After the plastic has hardened, the inserts are removed from the openings, after which the known mold can be "unloaded".

A drawback of the known mold is that it can produce an inspection / repair shaft or well, the inlet and the outlet opening of which make only one predetermined angle. In practice, this means that for each desired predetermined angle between the inlet and the outlet opening of the inspection / repair shaft or well, a different mold must always be produced. 1 0 0 0: 0 9 0 2 f (possibly with inserts or replacement parts ), which is unattractive from an economic point of view. To save mold costs, manufacturers of inspection / repair shafts or wells typically offer a limited range thereof, with a fixed package of angles between the aforementioned inlet and outlet opening of the shaft or well.

The object of the invention is to produce a mold by means of which a greater flexibility with regard to the predetermined angle between the inlet and the outlet opening of the shaft or well is provided, and for this purpose a mold of the Specified type according to the invention as a special feature that the inner mold contains at least two parts movable relative to each other for realizing an arbitrary predetermined angle between two openings.

In particular, the inner mold parts are rotatable relative to each other. Preferably, at least one inner mold part includes an outwardly extending part to form a discharge chute in the product. Such a trough drains additional medium-flowing medium (for example liquid) therein downwards into the well or shaft.

25

In a preferred embodiment of a mold according to the invention, the outer mold also contains at least two movable (in particular rotatable) parts. Although such an adaptation of the outer mold to the mutual position of the inner mold parts is generally preferred, it is also possible to work with a different outer mold (optionally with converters and / or exchangeable parts) in order to still have one. "0 3 to be economically more advantageous than is the case with prior art molds.

Sometimes, due to the external shape of the inner mold parts, a rotation angle between them of more than 120 ° (i.e. + 60 ° clockwise and -60 ° counterclockwise) will not be possible. In order ultimately to achieve a maximum angle of approximately 180 ° (namely + 90 ° clockwise and -90 ° counterclockwise) between the inlet and the outlet of the shaft or well in that case, specific inventions are used in accordance with the invention. inserts and reducers on the outer mold parts, which will be further elucidated on the basis of the figure description.

The invention also relates to a method for manufacturing a product with a first opening and a second opening at a predetermined angle relative to it, preferably an inspection / repair shaft or well with an inlet and an outlet opening in the 20 particularly of a sewage or drainage pipe system, using the mold. The invention also refers to a product manufactured using the mold.

The invention will be further elucidated with reference to figures shown in a drawing, in which figure 1 shows a preferred embodiment of the mold according to the invention, wherein outer and inner mold parts are drawn in exploded view and in perspective; 1 u 409 0 4 figure 2 shows a schematic bottom view of the inner mold drawn in figure 1 in perspective; Figure 3 shows a bottom view of the inner mold drawn in figure 1, schematically showing various rotational positions of one inner mold part relative to the other; Figure 4 shows a schematic top view of the outer mold of figure 1, using in principle two different types of one outer mold part and four different types of the other, thus enabling various rotational positions between both outer mold parts; figure 5 corresponds to figure 4, with the proviso that two different types of the other outer mold part are presently present; Figure 6 schematically shows a partly cut-away product manufactured with the aid of the mold of figure 1; Figure 7 shows the outer mold drawn in figure 1 provided with a switch part; and Figure 8 shows a repair / inspection pit manufactured using the mold shown in Figure 1 in perspective.

Figure 1 distinguishes a mold 1 according to the invention for the manufacture of an inspection / repair shaft or well with an inlet and an outlet opening in 1004090, in particular for a sewage or drainage pipe system. The mold 1 comprises an outer mold (also referred to as a "bottom mold") consisting of two parts 2,3 and an inner mold 5, also composed of two parts 4,5, or "top mold".

The outer or inner mold part 3.4 includes an opening 6.7 to form the inlet of the inspection / repair shaft or well, while an opening 8.9 in the outer or inner mold part 2.5 serves to create from the outlet of the aforementioned shaft or well. In the operating condition of the die X, the openings 6,7,8,9 are at least substantially mutually elongated in pairs, that is to say the center lines of the openings 6,7 on the one hand and those of the openings 8,9 on the other substantially coincide. When manufacturing the shaft or well, it is preferable to use inserts 10 and 11 which can be inserted into the pairs of openings 6,7 and 8,9 belonging to the actual mold χ. The loose inserts 10, 11, which are preferably made of aluminum, allow the well or shaft to be easily removed from the die X. The aforementioned pairs of openings are in particular positioned relative to each other such that the inlet of the shaft or pit is located higher than the outlet thereof relative to a substrate. All this ensures an improved flow of, for example, sewage through the shaft or well. In order to optimize the flow and to avoid liquid turbulence in the shaft or well, it is provided with one or more liquid gutters to be further explained with reference to Figure 6. Such a gutter drains additional liquid flowing from above downwards into the shaft or well. The aforementioned liquid chutes are formed by 1 0 0 i; Outwardly extending parts 12 on the inner mold part 5. In order not to unnecessarily complicate other figures, parts 12 are only shown in figure 2.

Both outer mold parts 2,3 have an adapter 13,14 offset about 15 ° from the normal on the cylindrical jacket surface of the parts 2,3, the function of which will be explained in more detail below with reference to Figures 4 and 5. put. The inserts 10,11 have a center line which is also offset approximately 15 ° from the center line of the openings 6,8. Its function, together with that of the reducers 13,14, will be explained later.

Figure 2 shows a composite schematic perspective bottom view of the inner mold parts 4,5 (still shown separately) in figure 1, parts which correspond to those of figure 1 being indicated with the same reference numerals. The inner mold part 5 is about 120 ° 20 (i.e. between a position in which the center line of the opening 9 encloses an angle of -60 ° or 60 ° L with the center line of the opening 7, and a position in which both center lines form an angle of + 60 ° or 60 ° R) can be rotated relative to the inner mold part 4, wherein the point of rotation is indicated by 15. The parts 4,5 are therefore, as it were, "infinitely adjustable" relative to each other. This point 15 is also the point at which the two inner mold parts 4,5 are attached to each other. Because of the specific external shape of the two parts 4,5, in particular of the spherical segment 16 of the inner mold part 4, along the surface of which the inner mold part 5 can move, a rotation angle of more than 120 ° is generally not possible. To ultimately achieve a maximum angle of approximately 180 ° between the inlet and the outlet '' '' 0 'D 3 0 7 of the repair shaft or well, use is made of the aforementioned reducers 13, 14 and inserts 10, 11 .

As shown in Figures 1 (and 3A), the adapter 13 is offset about -15 ° from the normal on the cylindrical shell surface, while the adapter 14 is offset accordingly about -15 °. These "rectified offset" adapters 13, 14 10 imply - as previously mentioned above - that the inserts 10,11 have a center line which is also offset by approximately -15 ° with respect to the center line of the openings 6,8, thus effecting that these inserts adjoin the openings 7,9 of the inner mold parts 4,5. The aforementioned openings 6,7 and 8,9, respectively, are not exactly aligned with each other with their respective axes, but are also offset from each other by approximately 15 °. Figure 3A shows that the centerline of the insert 11 includes a maximum angle 20 of -90 ° (90 ° L) with the centerline of the insert 10. Figure 3B refers to a corresponding situation as in Figure 3A, but is now of adapters 13,14 and inserts 10,11 each offset + 15 °, so that the inserts with their centerlines 25 mutually make a maximum angle of + 90 ° (90 ° R). Figure 3C refers to a situation where the centerlines of the openings 7 and 9 are in line with each other, and the inserts 10,11 of figure 3A and 3B respectively have an angle of -15 ° (drawn in bold) and + 15 ° 30 (dotted) drawn). This makes it possible for the (center lines of the) inlet and outlet of the repair shaft or well (or pipes, tubes and the like to be connected thereto) to enclose a maximum angle of 180 °.

1 0 0 4 0 9 0 8

Figure 4 relates to a schematic top view of the outer mold of Figure 1, with corresponding parts being designated with the same reference numerals. In principle, use is made of two different types 5 of the outer mold part 2 (drawn thinly): one has a reducer 13 in accordance with the above-described offset over -15 ° (A and B), while the other has a + 15 ° offset reducer 13 (C and D). It is preferable to design the outer mold part 2 in a rotationally symmetrical manner relative to the axis along which the various parts 2, 3, 4 and 5 of the mold 1 must be arranged together, so that in fact one type of outer mold part 2 will suffice. four different types of the outer mold part 3 (drawn in bold) are used: 15 (A) the adapter 14 is arranged such that the outer mold part 3 is rotatable relative to the outer mold part 2 between a position in which the center line of the opening 6 in the adapter 14 makes an angle of -45 ° with the centerline of the opening 8 provided in the adapter 13, and a position in which the aforementioned centerlines enclose an angle of -90 ° (insert 10 drawn thin); (B) same as (A), with the proviso that the two outer mold parts 2,3 are rotatable relative to each other between a position where the aforementioned center lines coincide, and a position where they enclose an angle of -45 °; 30 (C) and (D) respectively correspond to (A) and (B), with the proviso that instead of a negative there is a positive angle.

; Ü C ·; Ü 9 0 9

Figure 5 corresponds to Figure 4; in situations A, B and C respectively D, E and F the same outer mold part 2 is now used as in situations A and B respectively C and D of figure 4. However, instead of the four different types of the outer mold part 3 of figure 3, use is now made of two different types of the outer mold part 3: one is applied in the situations A, B and C of figure 5, and the other in the remaining situations D, E and F. Each time the outer ma-10 sections 2, 3 are mutually rotatable between a position in which the centerline of the opening 6 in the adapter 14 coincides with the centerline of the opening 8 in the adapter 13, and a position in which these centerlines form an angle of ± 90 °. As in figure 4, here too there is talk of a "stepless" adjustability of the parts 2,3. All this is achieved by using an alternating "left" or "right" placed switch part 17, the specific construction of which will be further elucidated with reference to figure 7.

20

With regard to Figures 4 and 5, it is noted that in a preferred embodiment the adapters 13,14 are designed as loose attachments, so that it is sufficient to have one type of the outer mold part 2 and the outer mold part 3 respectively.

Figure 6 refers to a partly cut-away repair shaft or well 18 in cross-section, which has been produced with the aid of the mold 1 of figure 1. The shaft or well is provided with a liquid chute 19 flowing from above - via a drain 20 - liquid 21 discharges downwardly into the shaft or well toward the outlet 22 thereof. This trough 19 is formed by

* - v V

10 the aforementioned parts 12 of the inner mold part 5 (figure 2).

Figure 7 shows the outer mold parts 2,3 of Figure 1 again 5, but now with the aforementioned interchangeable part 17. This interchangeable part 17 together with the outer mold part 3 can be moved along parts 23,24 of the outer mold part 2 acting as "rails". (in the direction of the arrows 25) and then to be sealed in a desired position on the outer mold part 3, for instance with the aid of a bolt / nut connection. The switch part 17 with the outer mold part 3 can be mounted on the rails 23, 24 by bending the rails further open at the drawn broken part.

15

Figure 8 shows a repair / inspection pit 25 manufactured using the mold 1 of Figure 1. The inner shape of the pit 25 is, as it were, complementary to the shape of the space between the outer and inner mold. In this connection, the liquid gutters 19 formed as a result of the parts 12 on the inner mold part 5 are clearly visible. Furthermore, visible edges 26 corresponding to the "seam" between the spherical segment 16 of the inner mold part 4 and the inner mold part 5 (see also figure 2). ). These edges 26 are proof that the well 25 is made with the die 1.

It is noted that the use of the offset adapters 13,14 and the corresponding offset inserts 10,11 is preferred, but is not strictly necessary. It can also be achieved by other means that pipes, tubes and the like to be connected to the inlet and the outlet of the repair shaft or well enclose an angle of maximum 180 °. In particular, the use of an adapter as described in the non-published Dutch patent application no. 1003947 in the name of the same Applicant. The content of that patent application 5 is expressly considered to be inserted herein.

It is further noted that the mold 1 is suitable for any plastic technique for manufacturing the inspection / repair shaft or well, in particular injection molding techniques under low or lower pressure (in the latter case also called "flow molding"), rotational casting techniques, "resin injection molding" etcetera.

In principle, it is in principle not essential where plastic is introduced into the space between the outer and the inner mold.

Incidentally, the present invention is not limited to the exemplary embodiments shown in the drawing, but also extends to other embodiments.

1004090

Claims (14)

1. Mold for the manufacture of a product with a first opening and a second opening at a predetermined angle relative thereto, preferably an inspection / repair shaft or well with an inlet and an outlet opening, in particular for a sewage or drainage pipe system, which mold is provided with an inner and an outer mold each with means for forming the openings, characterized in that the inner mold contains at least two parts movable relative to each other, in order to realize a random, predetermined angle between the two openings. 15 Mold according to claim 1, wherein the inner mold parts are rotatable relative to each other. Mold according to claim 2, wherein the inner mold parts are rotatable by a maximum of approximately 120 ° relative to each other. Mold according to claim 1, 2 or 3, wherein at least one inner mold part contains an outwardly extending part to form a discharge chute in the product. Mold according to any one of the preceding claims 1 to 4, wherein the outer mold also contains at least two parts movable relative to each other. Mold according to claim 5, wherein the outer mold parts are rotatable relative to each other. 5 0 0 4 0 I 0 Mold according to claim 6, wherein the outer mold parts are rotatable by a maximum of approximately 45 ° relative to each other. Mold according to claim 6, wherein the outer mold parts are rotatable by a maximum of approximately 90 ° relative to each other. 9. Mold according to claim 8, wherein an exchange part co-operating with at least one of the outer mold parts is provided. 10. Mold as claimed in any of the foregoing claims 1 to 9, wherein at least one of the outer mold parts 15 comprises an adapter displaced by approximately 15 ° relative to the surface normally of the outer mold part. Mold according to any one of the preceding claims 1 to 20 with 10, wherein the means are formed by openings arranged in the outer and inner molds and at least substantially aligned in pairs with each other, in which an insert can each be arranged. 25 Mold according to claim 11, wherein the centerline of the insert is offset by approximately 15 ° from the centerline of the respective opening. 13. Method for manufacturing a product with a first opening and a second opening at a predetermined angle relative thereto, preferably an inspection / repair shaft or well with an inlet and an outlet opening, in particular 1! ! I '1' vi u for a sewage or drainage pipe system, using a mold according to any one of the preceding claims 1 to 12. A product manufactured using a mold according to any one of the preceding claims 1 to 12.. Λ