Plastic article or earthenware shaping or treating: apparatus – Shaping surface including means to release or remove product... – By differential gas pressure ejecting means
Patent
1980-09-15
1982-05-18
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Shaping surface including means to release or remove product...
By differential gas pressure ejecting means
249 66A, 425DIG58, 425556, B29C 700
Patent
active
043302530
ABSTRACT:
The specification discloses an improved shut off valve for a canister and lid assembly used as part of a medical suction apparatus. The valve includes a cylindrical plunger made of a soft rubber-like material and having an upwardly facing concave disc integrally formed on the top of the plunger. When the fluid within the canister rises to a predetermined level, the plunger floats upwardly forcing the disc into a sealing relationship covering and blocking a suction port. Alternately, the soft rubber plunger may be dimensioned for use as a plunger cap for the upper end of a hard plastic plunger.
The soft rubber plunger and integral concave disc are formed in a composite die, including a disc die and a plunger die. Rubber is injected into the composite die through a bore to form the plunger and integral concave disc. To remove the rubber concave disc from the disc die, air is injected into a bore while the disc die is simultaneously moved away from the plunger die.
REFERENCES:
patent: 3020594 (1962-02-01), Makowski
patent: 3357058 (1967-12-01), Kritik
patent: 3373460 (1968-03-01), Lodney
patent: 3591898 (1971-07-01), Stenmo
patent: 4125246 (1978-11-01), von Holdt
patent: 4155698 (1979-05-01), Aichinger
"Effective Mold Design", Article in Plastics Engineering, 1958, pp. 111-115.
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