US3776680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder movement
Assignee: Milacron Inc
•
Filing: 1972-01-27
•
Granted: 1973-12-04
•
Expires: 1992-01-27
Abstract
Abstract In a blow moulding machine of the kind in which an extruder feeds a tubular extrusion into a two-part die, the die subsequently closing and gripping the extrusion and the extruder being retracted to stretch the extrusion for severing between the extruder nozzle and the die, the extruder nozzle is arranged to retract linearly and axially from the die so as to cause the extrusion to be stretched symmetrically and linearly along its axis, thereby resulting in the severed edges of the extrusion being in a plane normal to the axis of the extrusion.
Inventors
- 👤 R Saffron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:43
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
194 words
In combination in a machine for the blow-moulding of hollow articles from a tubular parison, an openable blowing die having separable portions adapted to meet at a plane of separation, an extruder including a nozzle and adapted to produce through said nozzle a continuously form tubular extrusion, said nozzle having its central longitudinal axis aligned with said plane of separation of the die portions, said extruder being movable linearly along its axis towards and away from the die portions, severing means movable normally to the axis of the extruder nozzle and positioned to pass between the extruder nozzle and the blowing die, means for closing the die portions onto a portion of tubular extrusion issuing from the extruder, means for moving the extruder along its axis away from the closed die portions, at a speed greater than the speed of issuance of the extrusion, and for stretching linearly and axially that part of the tubular extrusion which lies between the extruder nozzle and the closed die portions, and means to sever said part of the tubular extrusion while it is linearly and axially stretched, and means for operating the machine in the above sequence.
Claim 2
Dependent Claim
194 words
In combination in a machine for the blow-moulding of hollow articles from a tubular parison, an openable blowing die having separable portions adapted to meet at a plane of separation, an extruder including a nozzle and adapted to produce through said nozzle a continuously form tubular extrusion, said nozzle having its central longitudinal axis aligned with said plane of separation of the die portions, said extruder being movable linearly along its axis towards and away from the die portions, severing means movable normally to the axis of the extruder nozzle and positioned to pass between the extruder nozzle and the blowing die, means for closing the die portions onto a portion of tubular extrusion issuing from the extruder, means for moving the extruder along its axis away from the closed die portions, at a speed greater than the speed of issuance of the extrusion, and for stretching linearly and axially that part of the tubular extrusion which lies between the extruder nozzle and the closed die portions, and means to sever said part of the tubular extrusion while it is linearly and axially stretched, and means for operating the machine in the above sequence.
Claim 3
Dependent Claim
70 words
The combination of claim 1, further comprising a base structure, guide means carried by said base structure and disposed parallel to the axis of the extruder nozzle, and a mounting slidable with respect to said guide means and carrying said extruder, and wherein said driving means includes a hydraulic ram coupled to said guide means and to said mounting for moving the extruder along the axis of the extruder nozzle.
References Cited (Backward Citations)
US3125619A
Cited
US2790994A
Cited
US2975473A
Cited
US2988776A
Cited
US3005231A
Cited
US3038200A
Cited
US3217072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |