Extrusion head for the manufacture of hoses formed of plastic masses and containing reinforcement inserts

Claim 2

An extrusion head arrangement for manufacturing hoses formed of rubber or other plastic masses and containing pre-formed, solid reinforcement inserts, comprising an extrusion head housing, means providing an inlet for plasticized hose forming material at said housing, said housing being provided with means defining a pair of compartments in communication with said inlet, an extrusion opening arranged at the outlet side of said housing, an outlet provided for each of said compartments, each said outlet possessing a substantially ring-shaped outlet opening, said outlet openings being located concentrically with respect to one another in front of the inlet to said extrusion opening, dischaRge means opening into said openings of the compartments, and guide means within said housing for reinforcement material introduced into the housing in order to guide such pre-formed, solid reinforcement material in a predetermined spatial arrangement out of an annular gap defining said discharge means into said extrusion opening, said extrusion head arrangement being adapted to simultaneously and separately inject plasticized material from each of said outlet openings against both the inside and outside of said pre-formed, solid reinforcement material to thereby form said hoses.

Claim 3

The extrusion head arrangement as defined in claim 1, wherein said housing possesses a lengthwise bore, said extrusion die embodying an extrusion disk possessing said extrusion opening, said extrusion disk being mounted at the outlet side of the bore of the housing, said means defining a pair of compartments including a distributor head possessing a continuous bore arranged at the outlet side of the housing bore, said distributor head, said extrusion disk and said housing bore cooperating with one another to form a compartment opening in ring-shaped fashion into the extrusion opening and defining one of said pairs of compartments, said last-mentioned compartment communicating with said inlet provided at the housing for the plasticized hose forming material, an inner bushing mounted in the bore of the housing at a spacing from the walls of such housing bore, said bushing having a front section extending through said distributor head, said bushing having a bore defining the second of said pair of compartments, means for closing the rear end of such bushing bore, said bushing having a bore defining the second of said pair of compartments, means for closing the rear end of such bushing bore, said bushing bore being in flow communication with said inlet for the hose forming material, said extrusion die further embodying a mandrel extending within the bore of said inner bushing and extending at least with a portion thereof through said extrusion opening, said guide means for the reinforcement material introduced into said housing being located in an annular compartment formed between the inner bushing and the housing in order to guide such material in a predetermined spatial arrangement out of an annular gap defining said discharge means and located between the front end of said distributor head and the inner bushing into a substantially ring-shaped compartment formed between the mandrel and the extrusion disk.

Claim 4

The extrusion head arrangement as defined in claim 2, wherein said inner bushing is mounted in such fashion in said lengthwise bore of said housing that said reinforcement material can be delivered from the rear into said annular compartment between the inner bushing and the housing.

Claim 5

The extrusion head arrangement as defined in claim 1, wherein said annular gap communicates with a delivery channel for the reinforcement material, and said guide means are arranged at said annular gap.

Claim 6

The extrusion head arrangement as defined in claim 4, wherein said guide means is exchangeably mounted.

Claim 7

The extrusion head arrangement as defined in claim 1, wherein said guide means comprises a spirally configured element in order to deliver the reinforcement material in spiral configuration into the extrusion opening.

Claim 8

The extrusion head arrangement as defined in claim 1, wherein said guide means comprises a disk with guide slots for a number of bands of reinforcement material.

Claim 9

The extrusion head arrangement as defined in claim 1, wherein said outlets of the compartments are concentrically arranged about the axis of the extrusion die and open conically from the inside and the outside towards the outlet side in front of the inlet to the extrusion opening.

Claim 10

The extrusion head arrangement as defined in claim 1, wherein said housing has a continuous bore and said means providing said inlet comprising at least a lateral inlet for the hose forming material, said extrusion die embodyinG an extrusion disk with said extrusion opening and mounted at the outlet side of the housing bore, a first bushing arranged within the housing bore, said first bushing having a front end forming a distributor head and at least extending up to the region of the extrusion opening, a compartment defining one of said pairs of compartments formed between the distributor head and the wall of the housing bore and communicating with said inlet for the hose forming material, a second bushing arranged within said first bushing at a spacing from the inner wall thereof, the forward end of said second bushing extending at least up to the region of the extrusion opening and said second bushing having a bore defining the second of said pair of compartments, means for closing the rear end of said bore of said second bushing, said second bushing bore being in flow communication with said inlet for the hose forming material, said extrusion die further embodying a mandrel arranged within the bore of the second bushing and having at least a portion extending through the extrusion opening, said guide means being arranged in an annular compartment formed between the first and second bushings in order to guide material in a predetermined spatial arrangement out of an annular gap defining said discharge means and disposed between the front end of the distributor head and the second bushing into a substantially ring-shaped compartment formed between the mandrel and the injection disk.