Patent US3912436A successfully refreshed from Google Patents.
US3912436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for extruding and moulding plastic material
Assignee: Individual
•
Filing: 1973-08-20
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Granted: 1975-10-14
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Expires: 1993-08-20
Abstract
Abstract Apparatus for extruding a plastic material and moulding the thus extruded material to form a shaped product comprising feeding a mass of plastic material to an accumulation chamber where the mass is maintained in a plastic state, extruding the material from the accumulation chamber vertically downwards through an extrusion orifice to produce a sheet of said material whose weight corresponds approximately to the weight of the product to be formed, progressively increasing the width of the extrusion orifice, corresponding to the thickness dimension of the extruded sheet, during the duration of the extrusion of the sheet to compensate for ''''slip'''' phenomena and yield a sheet whose thickness is substantially uniform, and moulding the resulting sheet to form the desired shaped product.
Inventors
- 👤 Michel Bailly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:15
CPC Classifications
B; B29; B29C; B29C31/00; B29C31/004; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/15; B29C48/154; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/255; B29C48/2556; B29C48/30; B29C48/305; B29C48/307; B29C48/31; B29C48/313; B29C48/36; B29C48/375; B29C48/388; B29C51/00; B29C51/02; B29C51/14; B29C48/001; B29C48/0017; B29L; B29L2031/00; B29L2031/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
180 words
Apparatus for extruding and moulding a plastic material to form a shaped product, said apparatus comprising a vertical accumulation chamber, feed screw means for supplying plastic material to said chamber, an extrusion head coupled to said accumulation chamber and including means defining an extrusion orifice, vertically movable piston means extending into said accumulation chamber, means for reciprocally moving said piston vertically such that in the downstroke of the piston plastic material accumulated in said accumulation chamber is extruded downwardly through said orifice to form an extruded sheet of material, and means for moulding said sheet to form a shaped product, said means which defines the extrusion orifice including opposed members bounding said orifice, means supporting at least one of said members for displacement in a direction to adjust the width of said orifice and thereby the thickness of the extruded sheet, and means to progressively increase the width of the orifice during extrusion by displacing said one member so as to compensate for the tendency of the sheet to be non-uniform in thickness over its length due to slip phenomena.
Claim 2
Dependent Claim
180 words
Apparatus for extruding and moulding a plastic material to form a shaped product, said apparatus comprising a vertical accumulation chamber, feed screw means for supplying plastic material to said chamber, an extrusion head coupled to said accumulation chamber and including means defining an extrusion orifice, vertically movable piston means extending into said accumulation chamber, means for reciprocally moving said piston vertically such that in the downstroke of the piston plastic material accumulated in said accumulation chamber is extruded downwardly through said orifice to form an extruded sheet of material, and means for moulding said sheet to form a shaped product, said means which defines the extrusion orifice including opposed members bounding said orifice, means supporting at least one of said members for displacement in a direction to adjust the width of said orifice and thereby the thickness of the extruded sheet, and means to progressively increase the width of the orifice during extrusion by displacing said one member so as to compensate for the tendency of the sheet to be non-uniform in thickness over its length due to slip phenomena.
Claim 3
Dependent Claim
15 words
Apparatus as claimed in claim 1 comprising obturator means for selectively blocking said extrusion orifice.
Claim 4
Dependent Claim
19 words
Apparatus as claimed in claim 1 comprising heating means for maintaining the material in plastic state in said chamber.
Claim 5
Dependent Claim
30 words
Apparatus as claimed in claim 1 wherein said piston means includes a piston having a bore through which a heating medium can be circulated to control heating of the piston.
Claim 6
Dependent Claim
15 words
Apparatus as claimed in claim 1 wherein said one member is a horizontally displaceable plate.
Claim 7
Dependent Claim
19 words
Apparatus as claimed in claim 5 wherein said opposed members have curved surfaces to define a curved extrusion orifice.
Claim 8
Dependent Claim
41 words
Apparatus as claimed in claim 1 wherein said means supporting said one member comprises a turnable spindle, said one member being fixed to said spindle to travel therewith and vary the width of the extrusion orifice by rotation of said spindle.
Claim 9
Dependent Claim
51 words
Apparatus as claimed in claim 1 wherein said means supporting said one member comprises an oblique slide member, said one member being fixed to said slide member to travel therewith obliquely with respect to said extrusion orifice thereby to vary its width in accordance with the location of the slide member.
Claim 10
Dependent Claim
60 words
Apparatus as claimed in claim 1 wherein the moulding means comprises a mould adapted to receive the extruded sheet to form the shaped product, a counter mould facing the first said mould, and a slidable plunger member positioned in said counter mould for pressing a selected portion of the extruded sheet into the mould prior to closure of the mould.
Claim 11
Dependent Claim
30 words
Apparatus as claimed in claim 9 comprising cutter means on opposite sides of the mould for separating from the extruded sheet a section to be moulded as the shaped product.
Claim 12
Dependent Claim
25 words
Apparatus as claimed in claim 10 wherein said cutter means comprises a closed ring of circular or polygonal shape, through which the extruded sheet passes.
Claim 13
Dependent Claim
21 words
Apparatus as claimed in claim 10 wherein said cutter means comprises independent cutter elements on opposite sides of the extruded sheet.
Claim 14
Dependent Claim
17 words
Apparatus as claimed in claim 1 wherein said piston means includes a piston having a rectangular section.
Claim 15
Dependent Claim
17 words
Apparatus as claimed in claim 1 wherein said piston means Includes a piston having a circular section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |