DE1902758U - COLLAR FOR THE MANUFACTURING OF TUBES OR CONTAINER SHELLS FROM A SCREW-SHAPED PLASTIC STRIP. - Google Patents

Description

Mr. Ernst Müller, Freudenberg, Kr. Siegen, Gartenstr. 19th

Hollow mandrel for producing from a helically wound Plastic strips "existing pipes or container jackets

The innovation relates to a hollow mandrel for manufacturing Clay from a helically wound plastic strip existing pipes or container men, in which the windings of the plastic strip, preferably overlapping, welded to one another are.

The production of pipes or container jackets, in particular with larger diameters, from wrapped plastic strips is known per se. The turns of the plastic strip, in particular in the case of a smaller strip thickness, may be formed to be overlapped, or they may, in particular in the case of a greater material thickness, their edges butt against each other, so that the helical art

strips of fabric run in the same area or plane, and then are welded together. The winding and welding is done via one. Thorn, causing trouble when following After welding, the finished pipe or the container jacket is to be pulled off the mandrel, since the plastic material "after cooling shrinks sharply after welding and sits very firmly on the mandrel. When the pipe or jacket is pulled off the mandrel, there is always damage that would prevent the pipe or jacket from being used again no longer allow.

It is the task of the innovation to create a hollow mandrel for the production of plastic pipes or - "container jackets, after winding or welding the plastic strip reduced in diameter and in this way removed from the plastic pipe or sheath can be easily loosened so that it can be removed of the tube or jacket is easily possible.

According to the innovation, this is primarily achieved in that the hollow mandrel is made up of two sheet metal jacket segments with a larger segment angle and a third sheet metal jacket segment with a smaller segment angle, which is used to reduce the circumference or diameter of the mandrel via one or more mandrel support devices, for example pressure medium cylinders that can be acted upon at the same time, in a radial direction Direction are retractable.

In an appropriate further development of the fire, the larger Sheet metal jacket segments inside by running in the circumferential direction T-profile ribs are stiffened at the lower ends over a Joint are connected to each other, and at this joint it can be the

one end of cylinder "and piston rod be hinged while the other end of which via a connecting component with a substantially U-shaped longitudinal stiffener supporting the smaller sheet metal jacket segment is connected to which guide arms sit with rollers attached to their ends engage in guide rails, which are attached to both sides of the webs of the T-profile ribs are and run divergent.

According to another innovation, the webs of the U-profile ribs to attach the guide rails can be expanded inward by holding plates.

Finally, there is still a new feature that the legs of the U-shaped longitudinal stiffener for the smaller bleohmantle segment are bent outwards at the free edge and each with one left free from the smaller sheet metal jacket segment narrow edge strips that cut off flush with the smaller sheet metal jacket segment and over the upper ends of the U-profile ribs freely protruding edges of the larger sheet metal jacket segments support the extended hollow mandrel.

The firing is now based on the se \ i, for example reproducing drawing described in more detail, namely shows:

1 shows a simplified representation of a side view of a cylindrical hollow mandrel according to the innovation, while

Pig. 2 shows a view from the left or right into the interior of the hollow mandrel.

The hollow mandrel, generally designated 1, consists of two Sheet metal jacket segments 2 with a larger segment angle and a third Sheet metal jacket segment 3 with a smaller segment angle. All three o-segments In the normal position, 2 and 3 "form a closed cylinder jacket. The hollow mandrel shown in the drawing has a cylindrical shape, but can also have any other non-round shape without the innovation area is left.

The "two larger sheet metal jacket segments 2 are - if one the hollow mandrel in the shown normal position "considered - for example stiffened with T-irofilrippen 4, which at their lower Ends are connected to one another by a joint 5. The piston rod 6 of a pressure medium cylinder is also attached to this joint 5 Fastened rotatably via a fork piece 8, the cylinder 7 via a connecting component 9 with one extending over the entire length of the hollow mandrel 1 extending longitudinal stiffener 10 is connected. The longitudinal stiffener 10, on which the smaller sheet metal jacket segment is attached, is essentially U-shaped, with the legs 11 at the free edge, corresponding to the radius of the hollow mandrel 1, are bent outward and in the normal division shown in the drawing of the sheet metal shell segments 2 and 3 over the upper ends of the T-profile ribs 4 freely protruding edges 12 of the Trim sheet metal jacket segments 2.

Guide arms 13 ″ are attached to the longitudinal reinforcement 10, which extend on both sides of the intermediate component 9 perpendicular to the axis of the cylinder 7 and guide rollers on their stands (not visible). The guide roles intervene Guide rails 14, which are attached to the webs of the 'Ü-profile ribs 4 as well as attached to these holding plates 15 on both sides are. The guide rails 14 run with an upper short section parallel to one another and to the axis of the cylinder and diverge diagonally with their lower, longer section,

Within the mandrel 1 can in the area of each ϊ-profile rib pair 2, a pressure medium cylinder 7 can be provided or every second pair of T-profile ribs is provided with a pressure medium cylinder 7 Mistake. The pistons of the cylinders 7 can be acted upon simultaneously and on both sides. They can also be loaded on one side be and have a! return spring, where one expediently for the working position shown in the drawing a Will provide locking.

The cylinders 7 form with their pistons and piston rods 6 A mandrel support device, so to speak, which - especially with smaller mandrel diameters - be of a purely mechanical design can. For example, instead of the pressure medium cylinders 7, spindles, cams or spindles, which can be operated jointly from one end of the hollow mandrel 1, could be used Crank mechanisms are provided that perform the same function.

If a tube or container jacket (not shown) has been made of plastic over the mandrel 1, will the piston of the cylinder 7 is drawn in hydraulically or pneumatically, so that the cylinder 7 with the longitudinal reinforcement 10 and move the guide arms 13 downwards. That’s where they come Longitudinal edges of the smaller sheet metal jacket segment 3 from the area the subsequent inward movement of the protruding edges 12 of the sheet metal jacket segments 2 out. With further downward movement the! guide arms 13 pivot this - as a result of their operative connection with the! guide rails 14 - the T-profile ribs 4 around the joint 5 towards the inside towards one another, so that the circumference or diameter of the hollow mandrel 1 is reduced and that is in the Plastic pipe or the plastic container jacket produced by the winding process detaches from the mandrel 1 and can be easily pulled off.

The pressure medium connections for the cylinder 7 are not shown in the drawing for the sake of simplicity.

The innovation 'also applies to amendments to the enclosed Protection claim 1 outlined embodiment and relates above all to all ITeuerungsmerkmale, which in detail - or in combination - are disclosed throughout the description and drawing.

Protection claims

Claims (4)

SciUt z claims 1. Hollow mandrel for the manufacture of pipes or container jackets consisting of a helically wound plastic strip, "in which the turns of the plastic strip are welded together, preferably overlapping, characterized in that the hollow mandrel (1) consists of two sheet metal jacket segments (2) with a larger segment angle and a third sheet metal shell segment (3) is smaller segment angles of _s, are retractable to reduce the volume or diameter jJorns (1) through one or more mandrel support devices, for example, simultaneously acted upon pressure medium cylinder (7) in the radial direction. 2. Hollow mandrel according to claim 1, characterized in that the larger sheet metal jacket segments (2) inside, through in the circumferential direction running T-profile ribs (4) are stiffened, which are attached to the lower Ends are connected to one another via a joint (5), and that at this joint (5) one end of the cylinder (7) and piston rod (6) is articulated, while the other end via a connecting component (9) with a substantially U-shaped en, the smaller Sheet metal jacket segment (3) supporting longitudinal stiffener (10) is connected, on which guide arms (13) sit, which engage with sliding rollers attached to their ends in guide rails (14) which are attached to "both sides of the webs of the T-profile ribs (4)
and run divergent. 3. hollow mandrel according to claim 2, characterized in that
for fixing the guide rails (14) ^above the tege the T-profile ribs (4) are extended by support plates (15) inwardly. 4. Hollow mandrel according to claim 2, characterized in that the legs (11) of the U-shaped longitudinal stiffener (10) for the
minor sheet metal shell segment (3) are bent at the free edge towards the outside and in each case _m J_T a metal jacket from the smaller segment (3)
The narrow edge strips that are left free and cut flush with the smaller sheet metal jacket segment (3) and support the edges (12) of the larger sheet metal jacket segments (2) protruding freely over the upper ends of the TE profile ribs (4) when the hollow mandrel (1) is extended.