US3690798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder head
Assignee: Packaging Industries Inc
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Filing: 1969-10-24
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Granted: 1972-09-12
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Expires: 1989-10-24
Abstract
Abstract A variable orifice extruder head for extruding parisons whose wall thickness may be varied over the length of the parison. The extruder head comprises a die assembly movable with respect to a fixed mandrel for varying the die assembly orifice. The die assembly is supported by suspension rods from a fixed housing through which the mandrel passes and in relation to which the mandrel is also fixed. The suspension rods are threaded at their upper ends and have spur gears threaded thereon. An internal ring gear engages each of the spur gears in such manner that rotation of the ring gear causes rotation of the spur gears thereby to raise or lower the die assembly.
Inventors
- 👤 Anthony Raspante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:36
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/03; B29C48/09; B29C48/12; B29C48/13; B29C48/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
217 words
Apparatus for extruding resin material of wall thickness varying in a predetermined manner comprising structure forming a chamber for connecting said apparatus to a source of flow a resin material, a die having a centrally disposed bore extending therethrough and connected to the interior of said chamber, a mandrel extending through said chamber and having a portion extending within the bore of said die, and means for moving said die axially with respect to the length of said mandrel so as to change the size of the opening formed between said mandrel and said die thereby changing the wall thickness of the resin material extruded therethrough, said chamber having a centrally disposed bore extending therethrough, and in which said means for moving said die axially with respect to the length of said mandrel comprises means for movably mounting said die below said chamber with said bores of said chamber and said die substantially in alignment with one another, said mandrel having a portion extending through said bore of said chamber, said structure forming said chamber being provided with a plurality of bores extending therethrough, wherein said die mounting means comprises a plurality of suspension rods and means for securing said die to said rods, and wherein said rods extend through said plurality of bores in said structure.
Claim 2
Dependent Claim
217 words
Apparatus for extruding resin material of wall thickness varying in a predetermined manner comprising structure forming a chamber for connecting said apparatus to a source of flow a resin material, a die having a centrally disposed bore extending therethrough and connected to the interior of said chamber, a mandrel extending through said chamber and having a portion extending within the bore of said die, and means for moving said die axially with respect to the length of said mandrel so as to change the size of the opening formed between said mandrel and said die thereby changing the wall thickness of the resin material extruded therethrough, said chamber having a centrally disposed bore extending therethrough, and in which said means for moving said die axially with respect to the length of said mandrel comprises means for movably mounting said die below said chamber with said bores of said chamber and said die substantially in alignment with one another, said mandrel having a portion extending through said bore of said chamber, said structure forming said chamber being provided with a plurality of bores extending therethrough, wherein said die mounting means comprises a plurality of suspension rods and means for securing said die to said rods, and wherein said rods extend through said plurality of bores in said structure.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 including means for mounting said mandrel in a fixed position relative to said chamber.
Claim 4
Dependent Claim
55 words
The apparatus of claim 1 wherein the lower ends of said plurality of suspension rods have a predetermined cross-sectional form and wherein said plurality of bores in said structure forming said chamber form another cross-sectional form adapted to provide a locking engagement with the lower ends of said suspension rods to prevent relative motion therebetween.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1 further comprising said die mounting means for causing said die mounting means to raise and lower said die.
Claim 6
Dependent Claim
79 words
The apparatus of claim 1 wherein said die moving means further comprises a plurality of gears each having a central internally threaded portion, said gears being threadedly engaged to said upper ends of said rods, and an internal gear surrounding said plurality of gears and in engagement therewith, whereby rotation of said internal gear causes rotation of said plurality of gears and consequent vertical movement of said suspension rods and said die supported thereby with respect to said mandrel.
Claim 7
Dependent Claim
14 words
The apparatus of claim 5 including actuating means for selectively rotating said internal gear.
Claim 8
Dependent Claim
13 words
The apparatus of claim 6 wherein said actuating means comprises hydraulic actuating means.
Claim 9
Dependent Claim
54 words
The apparatus of claim 5 wherein said hydraulic actuating means includes a reciprocatable rod pivotally connected to said internal gear, whereby actuation of said rod in one direction causes said internal gear to rotate clockwise and actuation of said rod in an opposite direction causes said internal gear to rotate in a counterclockwise direction.
Claim 10
Dependent Claim
21 words
The apparatus of claim 6 including programmer control means for controlling said actuating means according to a predetermined sequence of operations.
Claim 11
Dependent Claim
179 words
An extruder head having a variable orifice for extruding a parison whose wall thickness may be varied comprising a die housing having a centrally disposed bore extending therethrough, a die, means movably mounting said die below said die housing, said die having a centrally disposed bore generally contiguous with said bore of said housing and defining therewith an extrusion chamber, a mandrel mounted relative to said housing and having a portion extending through said centrally disposed extrusion bores of said housing and said die, the end of said mandrel and the end of said bore of said die defining an extrusion orifice, and means for moving said die axially relative to said mandrel for avrying the dimensions of said orifice in order to change the wall thickness of the parison being extruded therethrough, said die housing being provided with a plurality of bores extending therethrough and wherein said die mounting means comprises a plurality of suspension rods secured at one end thereof to said die and wherein said rods extend through said plurality of bores in said die housing.
Claim 12
Dependent Claim
179 words
An extruder head having a variable orifice for extruding a parison whose wall thickness may be varied comprising a die housing having a centrally disposed bore extending therethrough, a die, means movably mounting said die below said die housing, said die having a centrally disposed bore generally contiguous with said bore of said housing and defining therewith an extrusion chamber, a mandrel mounted relative to said housing and having a portion extending through said centrally disposed extrusion bores of said housing and said die, the end of said mandrel and the end of said bore of said die defining an extrusion orifice, and means for moving said die axially relative to said mandrel for avrying the dimensions of said orifice in order to change the wall thickness of the parison being extruded therethrough, said die housing being provided with a plurality of bores extending therethrough and wherein said die mounting means comprises a plurality of suspension rods secured at one end thereof to said die and wherein said rods extend through said plurality of bores in said die housing.
Claim 13
Dependent Claim
86 words
The extruder head of claim 10 wherein said upper ends of said rods extend above said die housing and are threaded and wherein said die moving means includes said suspension rods and further comprises internally threaded gears, said gears threadedly engaging said upper ends of said rods, and an internal gear surrounding said gears and engaging the teeth of said spur gears, whereby rotation of said internal gear causes rotation of said gears and consequent vertical movement of said suspension rods and said die supported thereby.
Claim 14
Dependent Claim
16 words
The extruder head of claim 11 including hydraulic actuating means for rotating said internal ring gear.
Claim 15
Dependent Claim
27 words
The extruder head of claim 12 including programmer control means for controlling the actuating motion of said hydraulic actuating means according to a predetermined sequence of operations.
Claim 16
Dependent Claim
96 words
The extruder head of claim 10 wherein said die includes an upwardly extending cylindrical portion, and wherein said die housing is provided with a lower inner cylindrical wall defining the lower portion of said centrally disposed bore extending through said housing, said upwardly extending portion of said die fitting within said lower inner wall portion of said die housing, the periphery of said upwardly extending portion of said die being provided with an annular groove, and material disposed in said groove and forming a seal between said upwardly extending portion and said lower inner wall portion.
Claim 17
Dependent Claim
38 words
The extruder heAd of claim 14 in which said material disposed in said groove and forming a seal comprises resin material which has passed from said centrally disposed bore into said groove during operation of said extruder head.
Claim 18
Dependent Claim
56 words
The extruder head of claim 10 wherein the cross-section of the end portion of said mandrel and the cross-section of said bore of said die surrounding the end portion of said mandrel are unsymetrical with respect to one another to provide an orifice of irregular form, whereby the wall thickness of the parison has corresponding irregularities.
Claim 19
Dependent Claim
58 words
The extruder head of claim 10 wherein the end of said mandrel is circular in cross-section and wherein the end of said bore of said die surrounds the end of said mandrel and is eliptical in cross-section, thereby defining the extrusion orifice for extruding parisons whose wall thickness varies as the clearance between the mandrel and bore varies.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |