US4431105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material feed unit for an injection molding machine
Assignee: Farrel Corp
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Filing: 1981-06-15
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Granted: 1984-02-14
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Expires: 2001-06-15
Abstract
Abstract A plunger feed system for feeding stiff or thickened material into the injection unit barrel of an injection molding machine, minimizing the feed path of the material, to minimize the degradation of the fibers in the material. The system comprises a pair of pressurizable rams acutely arranged over an injection barrel, each ram also arranged perpendicular to the other, to facilitate the feeding operation and minimize material degradation.
Inventors
- 👤 Gregory W. Meeker
- 👤 Frank W. Scarson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:34
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/18; B29B; B29B7/00; B29B7/02; B29B7/22; B29B7/24; B29B7/248; B29B7/30; B29B7/58; B29B7/60; B29C31/00; B29C31/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A material feed unit, for feeding material with a fibrous texture to an injection unit having a reciprocable screw, said material feed unit comprising: a hopper for receiving a quantity of said material; a first angularly arranged reciprocal plunger in its retracted most position is enclosed by a partial inner wall of said hopper; a second angularly arranged reciprocal plunger in its retracted most position is enclosed by a partial inner wall of said hopper; said first and second plungers being arranged in the vertical plane that bisects the axis of rotation of said screw.
Claim 2
Dependent Claim
95 words
A material feed unit, for feeding material with a fibrous texture to an injection unit having a reciprocable screw, said material feed unit comprising: a hopper for receiving a quantity of said material; a first angularly arranged reciprocal plunger in its retracted most position is enclosed by a partial inner wall of said hopper; a second angularly arranged reciprocal plunger in its retracted most position is enclosed by a partial inner wall of said hopper; said first and second plungers being arranged in the vertical plane that bisects the axis of rotation of said screw.
Claim 3
Dependent Claim
32 words
A material feed unit, as recited in claim 1, wherein the locus of movement of said first plunger is about 90° with respect to the locus of movement of said second plunger.
Claim 4
Dependent Claim
31 words
A material feed unit, as recited in claim 1, wherein the locus of movement of said second plunger is about 45° with respect to the axis of rotation of said screw.
Claim 5
Dependent Claim
30 words
A material feed unit, as recited in claim 1, wherein said first plunger pushes a quantity of material from said hopper into the locus of movement of said second plunger.
Claim 6
Dependent Claim
31 words
A material feed unit, as recited in claim 1, wherein said second plunger has a ram having a face which is generally parallel to the axis of rotation of said screw.
Claim 7
Dependent Claim
37 words
A material feed unit, as recited in claim 5, whereifn said second plunger has a leading edge on said ram face which is arranged to slice any material between said ram and a wall of said hopper.
Claim 8
Dependent Claim
29 words
A material feed unit, as recited in claim 5, wherein said screw is reciprocably movable in a screw chamber in said unit, by engagement with a reciprocable drive unit.
Claim 9
Dependent Claim
41 words
A material feed unit, as recited in claim 7, wherein said screw has an arrangement of flights therearound, which have a radial gap between said flight and the walls of said screw chamber, to minimize any degradation of extrudable material therewithin.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |