Glass manufacturing – Press molding machine – Plural motors coaxial with plunger
Patent
1980-02-19
1981-06-23
Kellogg, Arthur D.
Glass manufacturing
Press molding machine
Plural motors coaxial with plunger
65305, 65318, C03B 1116
Patent
active
042748593
ABSTRACT:
In the operation of a pressing plunger for forming a parison from a gob of molten glass, it is important that the plunger be moved into the gob which is retained in the parison mold, with a fairly rapid motion and also be capable of being withdrawn from the formed parison as rapidly as possible. One other consideration is that it not be pressing the glass at the final portion of its travel at a very high force. By providing a large piston for moving the plunger into and out of pressing position, it is possible to move the plunger at a relatively high velocity with high operating pressure. A small piston is provided within the larger piston and by reason of having a substantially smaller surface area, with the smaller piston being connected to the plunger, a lower force is applied to the plunger. The plunger with its piston is moved by the larger piston to the fullest extent of the large piston's travel, and the smaller piston to which the plunger is attached is free to move relative to the large piston. This relative movement may occur at the final pressing position of the plunger. At this time, the pressure which is exerted on the smaller piston is the same as that which is exerted on the large piston, since the two are built coaxially of each other and are exposed to the same cylinder pressure. The force of the smaller piston will be substantially less due to the difference in the area of the smaller piston. This results in a significantly lower force being applied to the plunger at the time that it is meeting the greatest resistance to its movement. In this manner, the plunger may be initially positioned at high speed, then be finally positioned with fairly low force and then retracted or removed at a relatively high speed with the use of a single high pressure source of air.
REFERENCES:
patent: 2146346 (1939-02-01), Nelson
patent: 2289046 (1942-07-01), Rowe
patent: 3024571 (1962-03-01), Abbott et al.
patent: 3185560 (1965-05-01), Wilcock
patent: 3607206 (1971-09-01), Foster et al.
Click M. E.
Innis D. T.
Kellogg Arthur D.
Owens--Illinois, Inc.
Wilson D. H.
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