US 5,261,807 AGranted

Plasticizing assembly for use in an injection molding machine

OwnerKarl Hehlinventor

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Abstract

In a plasticizing assembly for use in an injection molding machine, which assembly has a high-pressure chamber and a low-pressure chamber, which contains the feed screw, and a plurality of fixing screws disposed on a circular line, a connecting sleeve is provided, which partly surrounds the plasticizing cylinder or a rear section of a bipartite plasticizing cylinder and surrounds also the nozzle body or a forward section of a bipartite plasticizing cylinder in part of its length and is secured to the plasticizing cylinder or to its rear section. The fixing screws are screwed in and axially supported in tapped bores of the connecting sleeve and at their end faces bear on abutment faces of the nozzle body or of the forward section of the plasticizing cylinder. As a result, a replacement of the nozzle body or of the forward section of the plasticizing cylinder can be effected in a simpler manner and more quickly and will require lower physical forces and a simpler implement and it is possible to supply energy at a higher rate.

Claims24

Dependent claims

In a plasticizing assembly for use in an injection molding machine for plastic materials, which assembly comprises

a plasticizing cylinder having a forwardly facing surface and an inside peripheral surface defining a low-pressure chamber;
and
a nozzle body internally defining a nozzle passage and having a rearwardly facing surface and provided with heating means,
said plasticizing cylinder and said nozzle body defining in front of said low-pressure chamber a high-pressure chamber, which has a cylindrical portion in said plasticizing cylinder and tapers in said nozzle body to the diameter of said nozzle passage and merges into said nozzle passage,
said assembly further comprising feed screw means disposed in said low-pressure chamber and defining the rear end of said high-pressure chamber and movable along said plasticizing assembly between rearmost and foremost positions, and
connecting means connecting said nozzle body to said plasticizing cylinder and comprising means defining a plurality of angularly spaced apart tapped bores, which are disposed on a circular line, and a plurality of fixing screws, which are screwed in and axially supported in respective ones of said tapped bores and are under initial stress to force said forwardly and rearwardly facing surfaces against each other under a contact pressure,
the improvements wherein
one of the parts consisting of said plasticizing cylinder and said nozzle body is formed with a plurality of angularly spaced apart abutment faces disposed on a circular line and facing away from the other of said parts,
said connecting means comprise a connecting sleeve, which surrounds said plasticizing cylinder and said nozzle body adjacent to said forwardly and rearwardly facing surfaces and is connected to the other of said parts and is formed with said tapped bores, which consist of through bores open to respective ones of said abutment faces, and
said fixing screws bear on respective ones of said abutment faces.

7 more elements

A kit of components for a plasticizing cylinder of an injection molding machine for plastic materials, which kit comprises

first and second plasticizing cylinders differing in length and having each a forwardly facing surface and an inside peripheral surface defining a low-pressure chamber, and
first and second nozzle bodies, which differ in length and each of which defines a nozzle passage and has a rearwardly facing surface and is provided with heating means, wherein
said first cylinder and said first nozzle body, or said second cylinder and said second nozzle body, are assembled to constitute respective plasticizing assemblies, which have the same length and in which said inside peripheral surface defines a low-pressure chamber and said cylinder and said nozzle body define in front of said low-pressure chamber a high-pressure chamber, which has a cylindrical portion in said plasticizing cylinder and tapers in said nozzle body to the diameter of said nozzle passage and merges into said nozzle body,
said kit also comprises feed screw means disposed in said low-pressure chamber so as to define the rear end of said high-pressure chamber and movable along said plasticizing assembly between rearmost and foremost positions, and
connecting means for connecting in each of said plasticizing assemblies said nozzle body to said plasticizing cylinder and comprising means defining a plurality of angularly spaced apart tapped bores, which are disposed on a circular line, and a plurality of fixing screws, which are screwed into and axially supported in respective ones of said tapped bores and under initial stress to force said forwardly facing and rearwardly facing surfaces against each other under a contact pressure,
one of said parts of each of said assemblies is formed with a plurality of angularly spaced apart abutment faces disposed on a circular line and facing away from the other of said parts of said assembly,
said connecting means comprise a connecting sleeve, which surrounds said cylinder and said nozzle body of each of said assemblies adjacent to said forwardly and rearwardly facing surfaces and is connected to the other of said parts of said assembly and is formed with said tapped bores, which consist of through bores open to respective ones of said abutment faces, and
said fixing screws bear on respective ones of said abutment faces.

5 more elements

Dependencies are inferred from the claim text.