DE1604586B1 - SHELL-SHAPED INTERMEDIATE PRODUCT MADE FROM DEEP-DRAWABLE MATERIAL FOR COVERING PIPE Bends - Google Patents

Description

explained in more detail. With a quarter of a cylindrical ring, the cut edges are not in one plane, but in two mutually perpendicular planes.

If in such a case the bending up is still carried out via the one shown in FIG. 3 continued in the state shown, so one reaches a surface of revolution in the final stage, whose guide curve is also a wavy line, as shown in FIG. 4 shows, the The plane of symmetry is preserved, but the largest and the smallest radii of the surface of revolution on the Go down half of the original value. At the same time, those formed from the circles are bell-shaped boundary lines moved into a plane. This process is based on FIG. 5, 6 and 7 clarified in more detail.

For orientation it should be pointed out that overlapping zones are drawn in on these figures are.

F i g. 5 shows a quarter of a cylindrical ring, cut open in the manner described, at the edges 7 are already slightly bent from each other. If the cover 8 is made of flexible, elastic material, when bending apart in the direction of arrows 9, a shell 10 with a doubly curved shape is produced Area as shown in FIG. 6 shows. If you move on in the direction of the arrows 11, the edges 12 move, which previously delimited the circular openings of the quarter circular ring, in the direction of arrows 13 Inside. This is continued until one of the FIGS. 7 corresponding spatially curved surface is created. Tn this the edges 12 lie in one plane, the edges 7 have changed their sense of curvature and now form semicircles that are perpendicular to the aforementioned plane.

This also turns the quarter of a cylindrical ring into a longitudinally cut one upwards open surface of revolution with the long edges converted into one plane. A corresponding shape can also be produced by turning.

In the same way, any other part of a cylindrical ring that is smaller than half a Ring is to be transformed into a shell open at the top. However, the above are preferred more detailed forms that result from the half or Quarter rings.

The thermoforming process for producing the shell-shaped intermediate product from thermoplastic Plastic film can be designed in a known manner as vacuum or pressure deformation will.

The drawing form can be made convex or concave, so that you can choose this as a patrix or Can use die.

It is particularly advantageous to use multiple shapes. After the bowl-shaped Intermediate product has been manufactured, excess sheet material is removed from the edge of the Deep-drawn product removed, for example with the help of a punch.

Thermoplastic, thermoformable plastic films. Among the various slides in question, such as those made of polyvinyl chloride, polyvinylidene chloride. Polystyrene, polyethylene or equivalent Copolymers, films made of polyvinyl chloride are particularly preferred because they are inexpensive and have favorable mechanical, especially elastic properties. The latter must be available because the sense of curvature of the outer areas of the bowl-shaped intermediate product changes when it is folded down to form the shell for pipe bends.

In principle, it is also possible to manufacture the shell-shaped intermediate product from sheet metal, if this is chosen thin enough.

Aluminum and steel sheets are particularly suitable. In the case of bowl-shaped intermediate products However, there is a slight risk of sheet metal when it is folded over to form the shell for a pipe bend a little squashed. Accordingly, the wrapping must be done carefully.

The formation of a shell from the shell-shaped intermediate product around a pipe bend, in particular an insulated pipe bend, does not present any difficulties.

The shell-shaped intermediate product, for example one shown in FIG. 7 shown is around the Pipe bends placed and folded in the direction of arrows 17 of this figure in such a way that the sense of curvature of the outer areas of the shell changes when it is folded down. The edges 7 become then connected to one another by suitable measures.

In the case of shells made of thermoplastics, this can easily be done by welding, otherwise but also z. B. by adhesive strips or snaps.

The advantages of the bowl-shaped intermediate product according to the invention are evident.

The shell-shaped intermediate product can be stacked to save space.

A pipe casing for pipe bends can be made from the intermediate product in a few simple steps form.

The shell-shaped intermediate product is in one piece, so that the tubular casing formed with it only has a seam.

1 sheet of COPY drawings

Claims (1)

1 2 claims made of deeply stretchable material for sheathing. "'Elbow, which is characterized in that it 1. Shell-shaped intermediate product from deep drawing through deep drawing the shape of a semes Drawable material for sheathing of pipe-innermost circular arc cut-open casing arches, characterized in that 5 of a half or a smaller part, e.g. it takes the shape of a quarter of a hollow cylindrical ring, which its innermost circular arc cut open to form a shell without an inwardly curved edge envelope a half or a Heineren area is bent apart. It can Partly, e.g. B. a quarter of a hollow cylindrical intermediate product in a favorable further design Ring, which becomes a shell without, according to its marginal parts, steps to produce uberinnen have curved edge regions that lap apart. is bent. To the production of the for the invention 2. Shell-shaped intermediate product according to the shell-shaped intermediate product according to the warm claim 1, characterized in that it involves molding processes from thermoplastic plastic film Its edge parts stages for generating 15 required deep-drawing form, it is particularly advantageous overlap areas having. liable that the rotationally symmetrical shape through Turning can be easily made. The process is shown in more detail in FIGS. 1 to 7 of the drawing. purifies. 20 Fig. 1 shows a planar section through a cylindrical ring; The present invention lies in the area of FIG. 2, a view in the direction of the arrow along FIG of the surface protection of insulated pipes and relates to section line I-I in Fig. 1; a shell-shaped intermediate product from deep-drawn Fig. 3 and 4 show sections through rotatable material for sheathing pipe bends. ² 5 surfaces that can be opened and closed Insulated pipes, e.g. B. hot water pipes will result in pulling a pipe according to FIG. 2;
the protection against moisture and mechanical Fig. 5 gives a view of a along the interior Damage often with a sheet metal jacket or a quarter of a cylindrical cut open radius wrapped in a plastic film. To coat the ring again; When using sheet metal, the pipe bend is 3 <> 6 and 7 show perspective representations of local adaptation with the aid of segment sections of the partially or completely unfolded surface common. When using thermoplastic films, FIG. 5. it is known to use arched parts, which consist of two The flat-cut cylindrical ring in FIG. 1 Semi-welded at the outer circumference has an axis radius R and a cross-sectional shell. These are open on the inside 35 radius r. Its outer radius is therefore R + r and, thanks to the flexibility and elasticity of the inner radius R-r. With a thicker line drawn in-foil over the arch. The open draws is a half cylindrical ring. Edges are again highlighted on the inner circumference with a side line is a quarter ring, connected. A disadvantage of these curved shaped parts, which corresponds to the usual shape of a pipe bend, is that two deep-drawing processes and an additional 4o He is cut along a line 3 (Fig. 2), welding process required for their production that follows the inner smallest circular arc,
are. The welded outer seam also often holds this quarter-ring cylinder in the direction not tight enough. The known sheaths for tube of arrows 4 (Fig. 2) pulled apart so that they bend together from two half-shells stands half of a surface of revolution, whose guide is also the disadvantage that they have two seam curves, like a wavy line they F i g. 3 shows. In places, what in terms of moisture-easy way can be imagined that the tightness of the protective cover can be disadvantageous. One of the two underneath the sleeve formed by the arrows 5 for a pipe dotted line curve pieces lying underneath also has the disadvantage that, conversely, the adaptation of this sleeve to insulated pipe bends 5 ° was set on the upper remaining half. It is clear that in such a case it is not easy to accomplish if the plane of symmetry is retained and the diameter of the insulated pipe due to the fact that even the smallest and largest radius of the fluctuating thickness of the insulation layer is formed over the area of revolution that of the initial or under-tolerance having. Moreover, the body corresponds. If the known molded parts described above cannot be stacked in a space-saving manner, which means that a large amount of space is required for storage when using a half cylindrical ring, then the edges of the body of the rotation lie in one plane. This plane is perpendicular. The object of the present invention is to line 6-6 in FIG. 1. If there is sufficient flexibility, an intermediate product of deep-drawable and elasticity of the deformed material can be proposed, a material that can be easily ^{bent into a shell 6o of} such semicircular shaped bodies over a corresponding to encasing pipe bends drawn the pipe bend. As a rule, in order to avoid the need for two or more, but only smaller circular ring sections, seams, as they are known from other arches, and in particular quarter pieces, so that the rotation of several work processes, such as welding, surface in corresponding pieces cut from two half-shells to form a pipe bend, to ⁶ 5 must be twisted. In principle, however, it is also possible, borrowed, to produce molded parts for any desired male ear bend. Let this be on a quarter part, as it is solved in FIG. 1 is identified by the reference number 2.