DE1024829B - Pneumatic tire valve - Google Patents

Description

GERMAN

The invention relates to valves for tubes of pneumatic tires, in particular for two-chamber air tubes, which have a lateral, tubular extension that is entirely within the common Base of the two-chamber air hose is housed.

Experience has shown that difficulties arise in the manufacture of two-chamber air hoses, namely when vulcanizing a valve of the aforementioned type and an outer hose a previously vulcanized inner tube. During this second vulcanization process The application of heat and pressure allows the rubber that forms the lateral extension to flow and cause a narrowing or closing of the passage formed therein.

As a result, there is a great loss of time and material. Purpose of the present invention it is therefore to create a valve for a two-chamber air hose which the aforementioned difficulties does not let arise.

Hose valves have already become known that are used to stiffen the valve stem, which is made of rubber can consist of a wire helix or a length of wire or a flexible tube. The order such a stiffening element is intended to prevent the air duct from penetrating outside Can compress forces, so that it is difficult to introduce the air when inflating the hose is. Furthermore, this stiffening element has the task of reduce or avoid the vibrations that occur when driving. These stiffening elements only have a spring or elastic one Effect, but cannot be used in the known way for a liquid agent to shut off a channel.

It is also known, in the vulcanization of hose valves with two through-holes, the lateral To close the air duct with an inserted mandrel, which is removed again after vulcanization will.

The invention now relates to a hose valve made of a valve body received by a rubber base with two holes, one of which is connected to a channel in a lateral extension of the rubber foot is connected, with the subsequent vulcanization of the hose as a result of this in a viscous state passing rubber before entering the channel is prevented by the fact that According to the invention, the channel in the extension has a wire helix, the turns of which are viscous-tight lie next to each other, absorbs. Here, the wire helix is expediently made from metal wire.

Two embodiments of the invention are

Applicant:
Dunlop Rubber Company Limited, London

Representative: Dipl.-Ing. E. Rathmann, patent attorney,
Frankfurt / M., Neue Mainzer Str. 40-42

Claimed priority:
Great Britain 10 November 1954

George Edward Drakeford,

Birmingham, Warwickshire (UK),

has been named as the inventor

standing on the basis of the drawing explained in more detail. It shows

1 shows an axial section through an embodiment and

Fig. 2 shows a second embodiment, also in axial section.

In the embodiment according to FIG. 1, a valve adapter 1 is used, on which a conventional Screw-on valve 2 is attached. The intermediate piece 1 comprises a cylindrical body 3 in the coaxial Arrangement is connected to a flexible valve base 4 made of rubber, one of which is flexible lateral extension 5 made of rubber.

The cylinder body 3 is with an on-axis filling passage 6, which extends from one end to the another extends and creates a connection with the inner chamber of the two-chamber air hose, and provided with two blind holes 7, 8 lying at right angles to one another, which initially do not interrelate stay in contact.

The cylinder body 3 protrudes on both sides over the valve base 4, the end 10 with a Screw thread 11 is provided for engagement with the usual screw-on valve 2 and the other end 12 is smooth and is inserted into a hole on the inner circumference of the inner tube. The cylinder body 3 has between the threaded end 11 and the radially extending, non-continuous bore 8 a Flange 13.

The flexible extension 5 of the rubber foot 4 has a passage 14 which is an extension of the radially extending, non-through bore 8 forms. A flexible spiral reinforcement in shape

709 880/63

suitable

a tightly wound steel spring wire 15, which is brass plated or otherwise treated to ensure better adhesion of the spring to the rubber, is arranged coaxially within the passage 14 and extends longitudinally, substantially over its entire length.

The spring can be made of a different material, for example brass.

When attaching the valve 1 to a two-chamber air hose, the rubber foot 4 is with the Cylinder body 3 exposed to the outside of the inner tube that the smooth end 12 of the The cylinder body 3 is inserted into a hole on the inner circumference of the hose and the flexible extension 5 made of rubber lies on the hose. The inner tube together with the parts 4, 3, 5 is in a mold inserted, inflated through the bore 6 and with the parts 4, 5 under the action of heat and pressure vulcanized.

Following the vulcanization, the inner hose is emptied and the axially directed, non-continuous one Bore 7 is extended until it is connected to the radially running, non-through bore 8 is in order to have a filling passage 9, the one with the passage provided in the extension 5 14 is related to form.

A previously injected hose, which is slit along its entire inner circumference, forms the outer tube and is wrapped around the inner tube, with the inner and outer tubes attached their inner circumferences are put together to form a common base, the rubber foot and the extension 5 between the inner and outer hose and common within them Base lie. The end of the passage 14 in the extension 5 opens into the between the inner and the outer chamber formed by the outer tube.

The entire two-chamber arrangement is then placed in a mold and after inflating the inner and the outer hose through the passages 6 and 9 and the outlet 14 under the action of heat and pressure vulcanized.

During this second vulcanization process, the tightly wound spring 15 prevents flow the mixture as a result of the action of heat and pressure in the passage 14, which thereby before a constriction or a closing is preserved.

After the vulcanization of the two-chamber air hose, it is emptied and removed from the mold. A conventional screw-on valve 2 is attached to the end of the cylinder body provided with screw thread 11 3 screwed on, and the hose is ready for use.

In the construction shown in Fig. 2, the cylinder body 16 has a smooth end 17 for insertion into a hole on the inner circumference of the inner tube of a two-chamber air tube and one with Screw-threaded opposite end 18 for receiving a screw-on valve 19 of a known type.

The rubber foot 22 has two lateral, opposite extensions 20 and 21, the Extensions 20, 21 and the foot 22 are vulcanized together with the body 16 in a mold.

The body 16 has an axle bore 23 which is in communication with the passage 24 of the valve 19, and two oppositely directed, but coaxially arranged, laterally extending bores 25, 26, which extend from the axle bore 23 to passages 27, 28 in the lateral extensions 20 or 21 lead. The outputs each take on a flexible reinforcing coil 29, 30, which is made of brass-plated steel wire, in an axially aligned arrangement consists.

Claims (2)

Patent claims: 1. Hose valve made of a valve body with two bores held by a rubber base, one of which is connected to a channel in a lateral extension of the rubber foot is, characterized in that the channel in the extension has a wire helix, the turns of which are viscous against each other, absorbs, 2. Valve according to claim 1, characterized in that the spring coil consists of metal wire. Considered publications:
German Patent Nos. 877 711, 690 719;
Swiss Patent No. 220 082;
U.S. Patent No. 2,551,038. 1 sheet of drawings © 709 880/63 2.58