Patent US4956247A successfully refreshed from Google Patents.
Patent US3734667A successfully refreshed from Google Patents.
US3734667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic extrusion apparatus
Assignee: Extruders Inc
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Filing: 1970-09-30
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Granted: 1973-05-22
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Expires: 1990-09-30
Abstract
Abstract A plastic extrusion apparatus of the type employing a rotatable screw mounted in an elongated tubular member and including pressures fluid operated piston means operably connected to the screw for applying a compressive axial force to the screw in a direction toward the discharge port of the extrusion apparatus. The apparatus further includes means operably connected to the piston means for ejecting the screw from the tubular member upon reciprocation of the piston means.
Inventors
- 👤 R Dray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:16
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29C48/00; B29C48/25; B29C48/252; B29C48/36; B29C48/395; B29C48/45; B29C48/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
335 words
A plastic extrusion apparatus comprising: a housing; a rotatable drive member supported for rotation within said housing and having an axial bore therethrough; hydraulic driving means coupled with said drive member for rotating said drive member; an elongated tubular member connected to said housing and extending therefrom in co-axial alignment with said bore of said drive member, said tubular member having a discharge port in the end remote from said housing and a feed opening adjacent said housing; a rotatable screw slidably mounted within said tubular member and releasably connected to said drive member, said screw being capable of axial motion relative to said drive member but being engaged with said drive member for rotation thereby; first piston means adapted for rotation with said drive member and contact with said screw for applying an axial bearing force to said screw during rotation thereof and for axially moving said screw during non-rotation thereof in a direction toward said discharge port upon an initial advance of said first piston means in said direction, said first piston means including a piston rod having a central bore formed therein communicating with said screw and in axial alignment therewith; second piston means connected to the end of said first piston means remote from said screw and having a central bore axially aligned with said central bore of said piston rod; a rod slidably disposed within said aligned bores of said piston rod and second piston means, said rod abutting said screw; and means mounted upon said second piston means for releasably gripping said rod; whereby said screw is moved in a direction toward said discharge port by said first piston means and said rod upon said initial advance of said first piston means and thereafter by said rod upon sequential stroking of said first piston means while said rod is held by said gripping means, followed by retraction of said first piston means by actuating said second piston means while relaxing the hold of said gripping means upon said rod.
Claim 2
Dependent Claim
335 words
A plastic extrusion apparatus comprising: a housing; a rotatable drive member supported for rotation within said housing and having an axial bore therethrough; hydraulic driving means coupled with said drive member for rotating said drive member; an elongated tubular member connected to said housing and extending therefrom in co-axial alignment with said bore of said drive member, said tubular member having a discharge port in the end remote from said housing and a feed opening adjacent said housing; a rotatable screw slidably mounted within said tubular member and releasably connected to said drive member, said screw being capable of axial motion relative to said drive member but being engaged with said drive member for rotation thereby; first piston means adapted for rotation with said drive member and contact with said screw for applying an axial bearing force to said screw during rotation thereof and for axially moving said screw during non-rotation thereof in a direction toward said discharge port upon an initial advance of said first piston means in said direction, said first piston means including a piston rod having a central bore formed therein communicating with said screw and in axial alignment therewith; second piston means connected to the end of said first piston means remote from said screw and having a central bore axially aligned with said central bore of said piston rod; a rod slidably disposed within said aligned bores of said piston rod and second piston means, said rod abutting said screw; and means mounted upon said second piston means for releasably gripping said rod; whereby said screw is moved in a direction toward said discharge port by said first piston means and said rod upon said initial advance of said first piston means and thereafter by said rod upon sequential stroking of said first piston means while said rod is held by said gripping means, followed by retraction of said first piston means by actuating said second piston means while relaxing the hold of said gripping means upon said rod.
Claim 3
Dependent Claim
210 words
A plastic extrusion apparatus comprising: a housing; a rotatable drive gear having an axial bore supported for rotation within said housing; at least one hydraulic motor coupled with said gear for rotating said gear; an elongated tubular member connected to said housing and extending therefrom in co-axial alignment with said bore of said gear, said tubular member having a discharge port remote from said housing and a feed opening adjacent said housing; a rotatable screw slidably mounted within said tubular member, said screw being axially movable in relation to said gear but being engaged with said gear for rotation thereby; a cylinder having first and second chambers formed therein mounted upon said housing opposite from said tubular member and in axial alignment therewith; a piston rod having a central bore slidably disposed within said bore of said gear, said rod abutting said screw at one end and extending through said first and second chambers; firsT piston means mounted upon said piston rod and slidably disposed within said first chamber; second piston means mounted upon said piston rod and adapted for axial movement within said second chamber; a rod slidably disposed within said bore of said piston rod; and means mounted upon said second piston means for releasably gripping said rod.
Claim 4
Dependent Claim
210 words
A plastic extrusion apparatus comprising: a housing; a rotatable drive gear having an axial bore supported for rotation within said housing; at least one hydraulic motor coupled with said gear for rotating said gear; an elongated tubular member connected to said housing and extending therefrom in co-axial alignment with said bore of said gear, said tubular member having a discharge port remote from said housing and a feed opening adjacent said housing; a rotatable screw slidably mounted within said tubular member, said screw being axially movable in relation to said gear but being engaged with said gear for rotation thereby; a cylinder having first and second chambers formed therein mounted upon said housing opposite from said tubular member and in axial alignment therewith; a piston rod having a central bore slidably disposed within said bore of said gear, said rod abutting said screw at one end and extending through said first and second chambers; firsT piston means mounted upon said piston rod and slidably disposed within said first chamber; second piston means mounted upon said piston rod and adapted for axial movement within said second chamber; a rod slidably disposed within said bore of said piston rod; and means mounted upon said second piston means for releasably gripping said rod.
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |