Meshing cog-wheel injection unit with lateral sealing and scrope

Details Meshing cog-wheel injection unit with lateral sealing and scrope Meshing cog-wheel injection unit with lateral sealing and scrope

1981-10-23

1984-03-27

Vrablik, John J.

Rotary expansible chamber devices

Grooved abutting cylinder-rotating member end surfaces

Grooved working member surface

418 81, 418134, 418144, 418181, 418178, 418206, 1525651, F04C 218, F04C 1300, F04C 1500

Patent

active

044391200

ABSTRACT:
An injection unit intended to inject, for example, rubber into a mold comprises in principle 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 subjects 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, 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.

REFERENCES:
patent: 2350089 (1944-05-01), Behringer
patent: 2470355 (1949-05-01), Lauck
patent: 3191540 (1965-06-01), Skretting
patent: 3759220 (1973-09-01), Saito et al.
patent: 4194841 (1980-03-01), Tadmor

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