Non-return valve for use in a molding system

Details Non-return valve for use in a molding system Non-return valve for use in a molding system

2008-04-29

2008-04-29

Fristoe, Jr., John K. (Department: 3753)

Valves and valve actuation

With material guide or restrictor

Movable or resilient guide or restrictor

C137S614160, C425S557000, C425S559000

Reexamination Certificate

active

11062020

ABSTRACT:
The present invention relates to a non-return valve that can be configured for use anywhere along a molding material flow path in a molding system. The non-return valve of the present invention includes an improved means to restrict the backflow of melt therethrough during injection. In particular, a spigot-seal is configurable, during injection, between overlapping, closely-spaced, and mutually parallel complementary male and female spigot portions that are configured between complementary valve members. The spigot-seal advantageously maintains an effective backflow restriction even in the eventuality of transient movement between the spigot portions during injection. Preferably, the non-return valve of the present invention is also configured to include a means for mutually aligning and/or guiding the complementary valve components that ensures a proper alignment between the complementary spigot portions, and may also serve to improve the function and longevity of a face-seal, when present. The non-return valve of the present invention provides particularly advantageous utility when configured for use in a barrel assembly of an injection unit for the injection molding of a metal alloy.

REFERENCES:
patent: 3438393 (1969-04-01), Godley, II
patent: 4377180 (1983-03-01), Biljes
patent: 4643665 (1987-02-01), Zeiger
patent: 4850851 (1989-07-01), Dinerman
patent: 5040589 (1991-08-01), Bradley
patent: 5044926 (1991-09-01), Dinerman et al.
patent: 5151282 (1992-09-01), Dray
patent: 5258158 (1993-11-01), Dray
patent: 5401161 (1995-03-01), Long
patent: 5441400 (1995-08-01), Zeiger
patent: 5470514 (1995-11-01), Dray
patent: 5518394 (1996-05-01), Shiozawa et al.
patent: 5680894 (1997-10-01), Kilbert
patent: 5945141 (1999-08-01), Shirota et al.
patent: 6007322 (1999-12-01), Suumen et al.
patent: 6227841 (2001-05-01), Viron
patent: 6435201 (2002-08-01), Holzschuh
patent: 6464488 (2002-10-01), Dray
patent: 6681837 (2004-01-01), Wu et al.
patent: 3240872 (1984-05-01), None
patent: 4434326 (1995-06-01), None
patent: 10230041 (2004-02-01), None
Database WPI Week 199239 Derwent Publications Ltd. London, GB; AN 1992-322304 & SU 1 689 097 A1 (Termoplastovatomat Prodn Assoc) Nov. 7, 1991 Abstract; figures 1,2.

Affiliated with

Also associated with

Rating

Non-return valve for use in a molding system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Non-return valve for use in a molding system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-return valve for use in a molding system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3955697