DE1275766B - Tape made of wires or strands overmoulded with a rubber mixture for the production of inserts for pneumatic vehicle tires - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B29h

German class: 39 a6- 9/04

Number:
File number:
Registration date:
Display day:

P 12 75 766.3-16 (B 55844)

December 9, 1959

22nd August 1968

The invention relates to a strip of wires or wires overmolded with a rubber mixture Strands for the production of inserts for pneumatic vehicle tires from a screw thread-like winding of the tape while pressing the longitudinal edges produced cylindrical and cut into inserts Wraps.

The use of such a tape consisting of a single overmolded strand is made possible by the U.S. Patent 1,464,632 known in the form that it has closely spaced turns wound into an endless roll running over two drums while still vulcanizable is, whereby the adjacent turns under pressure by means of a special Connect the device to each other. In this case, there is no connection between the individual turns Calender roll required, as is the case, for example, with an otherwise similar roll according to the USA patent 1519 522 is used to make the turns of a round wound on a drum To unite the tape with each other and in this way to produce a winding with a smooth surface, which after separation, for example by means of an oblique cut, a plurality of each other having parallel, juxtaposed flexible wires.

It is also known from US Pat. No. 2,902,083 to have a plurality already in the extrusion press to encapsulate wires running next to each other at the same time, whereby already a tape with a flat, rectangular cross-section is created. However, this tape is contrary to that previously discussed The winding is not helical, but wound in turns one on top of the other. the The force to unite the individual windings inevitably results from the in the to be wound Band ruling train.

The aim of the invention is to design a band of the type described above so that with this without special pressure means, the windings applied next to one another, for example on a drum can be combined with one another by taking advantage of the train in the wound tape.

For this purpose, it is provided according to the invention that the tape produced during the injection molding process is beveled Has longitudinal edges for mutual overlap when winding the tape into a roll.

In this way, despite the band windings wound next to one another, a component of the radial force of the band, which is solely decisive for the union of the successive windings, is shared with a rubber mixture
encapsulated wires or strands for the production of inserts for pneumatic vehicle tires

Applicant:

Bridgestone Tire Company Limited, Tokyo

Representative:

Dr.-Ing. E. Hoffmann, patent attorney,

8000 Munich 8, Maria-Theresia-Str. 6th

Named as inventor:

Hiroshi Uotani, Kurume City (Japan)

each preceding turn with, whereby the mutually facing longitudinal surfaces of the turns be safely united with each other. Any subsequent calendering is therefore superfluous.

Further details of the band can be found in the following description of one shown in the figures Embodiment emerges. *

The F i g. 1 and 2 show a schematic elevation and plan view of one for use of the tape suitable device.

In the figures, 1 denotes spools on which wire strands C are wound. An appropriate number of wire strands C , after being passed through a safety device 2, are combined and fed to a preheating device 3, in which they are preheated, for example, by guiding them over steam-heated drums or passing electric current through them.

From the preheating device 3, the wires pass to a nozzle 4 N of a rubber extruder 4. They are kept under tension by a device. This device can act on the coils 1 or form part of the safety device 2, unless it is provided separately.

In the nozzle 4 N of the rubber extrusion press, the strands are overmolded with a rubber mixture lying apart from one another, producing the specified profile with beveled longitudinal edges. The emerging tape 11 first runs over a drawing machine 5, then onto a winding device 6. After passing a guide roller 7, it passes through a stop device 8, which is intended to hold the tape end and is provided with a knife, into the winding machine 9. In the latter it is in tight

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adjacent turns wound onto a drum 10, the still sticky Connect the beveled side edges with each other by pressing against each other.

The drum 10 is used to guide a knife with which the resulting endless lap is cut can be provided with an inclined groove 12. The cut one, a parallelogram-shaped one The sheet-forming roll is then folded or cut, with the individual parts on one Tire molding machine are laid in layers and form the tire carcass.

Claims (1)

Claim: Tape made of wires or strands overmolded with a rubber mixture for the production of Deposits for pneumatic vehicle tires made of a screw thread-like winding of the tape cylindrical rolls cut into inserts, produced by pressing the longitudinal edges, characterized in that the belt (11) produced during the injection molding process bevelled Has longitudinal edges for mutual overlap when winding the tape into a roll. Considered publications:
German Patent Nos. 373 092, 902 788;
French Patent Specification No. 957 925;
U.S. Patents Nos. 1317426, 1464632,
519 522.1 657 818, 2 902 083. 1 sheet of drawings 809 597/209 8.68 © Bundesdruckerei Berlin