F - Mech Eng,Light,Heat,Weapons – 04 – C
Patent
F - Mech Eng,Light,Heat,Weapons
04
C
18/680
F04C 15/00 (2006.01) F04C 13/00 (2006.01)
Patent
CA 1165524
ABSTRACT OF THE DISCLOSURE An injection unit intended to inject, for example, rubber into a mold comprises in priciple two driven cog-wheels, which are located each in a hollow space in the unit housing and mesh with each other, and which in an injection chamber located in direct connection to the engagement zone of the cog-wheels subject material fed-in to a high pressure, so that the material is pressed out of the injection chamber to a mold. Due to the high pressure, sealing problems arise which according to this invention are solved in that in the housing of the injection unit plane sealings are provided for co operation with peripheral side portions of the respective cog-wheel, and that at least in the sides of the cog-wheels or in the surfaces of the plane sealings facing to the cog-wheels grooves extending all about are located radially inside the base circle of the cog-wheels for taking up possible material leaking in between the cog-wheels and the plane sealings, and that in connection to the respective groove r in the rotation direction of the cog-wheels after the injection chamber, means are provided for guiding said material in between the cogs of the cog- wheels and, thus, for returning the material to the injection chamber.
388675
Gowling Lafleur Henderson Llp
Skega Aktiebolag
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