US PATENT SUBCLASS 164 / 22
.~.~.~.~.~ Employing compressed air as ram or piston to force sand against shaping surface

Current as of: June, 1999
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164 /   HD   METAL FOUNDING

1  DF  PROCESS {6}
6  DF  .~ Shaping a forming surface (e.g., mold making, etc.) {8}
15  DF  .~.~ Shaping fluent material to form mold {9}
19  DF  .~.~.~ By spraying or slinging material against shaping surface {1}
20  DF  .~.~.~.~ Particulate solid material {2}
22.~.~.~.~.~ Employing compressed air as ram or piston to force sand against shaping surface

DEFINITION

Classification: 164/22

(under subclass 20) Process directed to employing compressed air as a ram or piston to force sand from a cartridge or container in which the material is supplied in the shape of a compacted column or the like against the shaping surface.

(1) Note. The compressed air does not come into actual contact with the sand that is being forced against the shaping surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

20, for those patents in which a stream of compressed air leaves the machine chamber carrying with it sand which is aerated before and during the blowing process.