Plastic article or earthenware shaping or treating: apparatus – With direct application of magnetic force to manipulate...
Patent
1992-08-26
1994-11-15
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
With direct application of magnetic force to manipulate...
26432812, 26432813, 264572, 425533, 425546, 425812, 425536, B29L 4500, B29L 4534, B29D 2200
Patent
active
053642520
ABSTRACT:
A gas injector having a retractable nozzle with linear gas feed passage therethrough for a gas assist plastics injection molding machine. The injector interfaces with the injection molding tool and has a nozzle with a tip that, in a forward position, protrudes through a port therein leading into the tool cavity or a runner system leading into the cavity for gas injection during molding. The nozzle tip is connected by a nozzle body to a base that is operatively mounted in an actuator housing. The base is connected to an in-line gas routing extension of the nozzle that projects through the outer cover of the housing. The extension is coaxial with an internal spring that seats on the base and holds the nozzle tip in a gas injection position resisting the force of plastics injection pressure. The base connected nozzle is retracted by combined flux fields of an electromagnet and a permanent magnet mounted within the housing while compressively loading the spring enhancing gas release from the cavity tool separation and subsequent ejection of molded part. The electromagnet is then deenergized since the permanent magnet has a sufficient magnetic force field to, hold the base and the attached nozzle in the retracted position. For return to the gas injection position, the electromagnet is again energized but with the current supplied thereto reversed so flux field of the electromagnet is reversed to negate flux field of the permanent magnet allowing the spring to return the nozzle to the forward position.
REFERENCES:
patent: 2915681 (1959-12-01), Troy
patent: 3174181 (1965-03-01), Langecker
patent: 3253098 (1966-05-01), Perry
patent: 3443585 (1969-05-01), Reinicke
patent: 3606171 (1971-09-01), Voelker
patent: 3683239 (1972-08-01), Sturman
patent: 3755766 (1973-08-01), Read, Jr.
patent: 3887312 (1975-06-01), Seary
patent: 3934816 (1976-01-01), Terrell et al.
patent: 4064210 (1977-12-01), Kellogg
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4131665 (1978-12-01), Bodson et al.
patent: 4676730 (1987-06-01), Yamasaki
patent: 4740150 (1988-04-01), Sayer
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4836578 (1989-06-01), Soltis
patent: 4865799 (1989-09-01), Sadr
patent: 4923667 (1990-05-01), Sayer
patent: 4944910 (1990-07-01), Hendry
patent: 5044924 (1991-09-01), Loren
patent: 5059112 (1991-10-01), Wieser
patent: 5069858 (1991-12-01), Hendry
patent: 5069859 (1991-12-01), Loren
patent: 5198238 (1993-03-01), Baxi
Shah, Suresh and Hlavaty, Dave, "Gas Injection Molding of Thermoplastic Composite Window Guidance Channel", SAE Technical Paper, Warrendale, Pa. Feb., 1991.
Compeau David E.
Hlavaty David G.
Shah Suresh D.
General Motors Corporation
Grove George A.
Leyson Joseph
Woo Jay H.
LandOfFree
Gas injector with retractable nozzle for assist of plastics inje does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas injector with retractable nozzle for assist of plastics inje, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas injector with retractable nozzle for assist of plastics inje will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1093277