US3844699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding machine with a rotary plunger and rod mixing and working chamber
Assignee: Individual
•
Filing: 1973-09-11
•
Granted: 1974-10-29
•
Expires: 1993-09-11
Abstract
Abstract An apparatus and method are herein provided for simultaneously melting and mixing polymer materials for injection molding. The material, to be molded, is substantially entrapped between opposing surfaces of a retaining member and a radial face of a rotatable plunger member. A rod like projection may be presented to extend normally from the, material engaging, radial face of the plunger member. Additionally, a reciprocating action may be imparted to the plunger member to enhance the mixing and homogenizing action thereof, in preparation for the injection of the material into a suitable mold.
Inventors
- 👤 B Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:04
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/53; B29C2045/536
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
Apparatus for use in mixing and working plastic materials comprising a cylindrical chamber, a cylindrical plunger closing one end of said chamber and movable axially within said chamber into and out of contact with material in said chamber, means for effecting relative rotation between said plunger and chamber with respect to each other to mix and work material within said chamber, an exit port in the end of the chamber opposite to said plunger, a cylindrical rod-like member of substantially smaller diameter than said plunger extending axially of and being axially displaceable with respect to said plunger while being held axially fixed within said cylindrical chamber, means for rotating said rod-like member to cause material in said chamber to flow axially along said rod-like member when said plunger is moved in a direction away from said exit port and to be folded back upon itself when said plunger is advanced toward said exit port to aid in mixing and working the material.
Claim 2
Dependent Claim
162 words
Apparatus for use in mixing and working plastic materials comprising a cylindrical chamber, a cylindrical plunger closing one end of said chamber and movable axially within said chamber into and out of contact with material in said chamber, means for effecting relative rotation between said plunger and chamber with respect to each other to mix and work material within said chamber, an exit port in the end of the chamber opposite to said plunger, a cylindrical rod-like member of substantially smaller diameter than said plunger extending axially of and being axially displaceable with respect to said plunger while being held axially fixed within said cylindrical chamber, means for rotating said rod-like member to cause material in said chamber to flow axially along said rod-like member when said plunger is moved in a direction away from said exit port and to be folded back upon itself when said plunger is advanced toward said exit port to aid in mixing and working the material.
Claim 3
Dependent Claim
16 words
Apparatus as defined in claim 1 wherein means are provided for heating said chamber and plunger.
Claim 4
Dependent Claim
31 words
Apparatus as defined in claim 1 wherein means are provided for moving said plunger toward said exit port in said chamber to discharge material from said chamber through said exit port.
Claim 5
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein said exit port is provided with valve means controlling the flow of material therethrough.
Claim 6
Dependent Claim
25 words
Apparatus as defined in claim 1 wherein said exit port communicates with an injection mold for the purpose of forming the shape of the material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |