US3887170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection unit for an injection moulding machine
Assignee: LUDWIG ENGEL KG
•
Filing: 1974-06-07
•
Granted: 1975-06-03
•
Expires: 1994-06-07
Abstract
Abstract An injection unit for an injection moulding machine, in particular for processing thermoplastic materials, has a rotatable screw which is disposed in an axially displaceable material cylinder and which is axially displaceable relative to the cylinder. Both the cylinder and the screw are movable by their own respective hydraulic cylinders. The cylinder is fixedly connected to bar members which are displaceable by hydraulically actuated pistons. Each bar member carries a further piston which is slidable in a cylinder which is connected to the screw or the actuating means thereof.
Inventors
- 👤 Friedrich Heindl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:18
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/03; B29C45/07; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29C45/5008
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
An injection unit for an injection moulding machine, in particular for processing thermoplastic materials, said unit comprising: a rotatable screw which is disposed in an axially displaceable material cylinder and which is axially displaceable relative to said cylinder; respective separate hydraulic cylinders for separately moving said cylinder and screw; said cylinder being fixedly connected to bar members which are displaceable by first hydraulically actuated pistons operable within said hydraulic cylinders of said cylinder; and said bar members having thereon second pistons which are slidable within said cylinders of said screw, said cylinders of said screw being operatively connected to said screw.
Claim 2
Dependent Claim
101 words
An injection unit for an injection moulding machine, in particular for processing thermoplastic materials, said unit comprising: a rotatable screw which is disposed in an axially displaceable material cylinder and which is axially displaceable relative to said cylinder; respective separate hydraulic cylinders for separately moving said cylinder and screw; said cylinder being fixedly connected to bar members which are displaceable by first hydraulically actuated pistons operable within said hydraulic cylinders of said cylinder; and said bar members having thereon second pistons which are slidable within said cylinders of said screw, said cylinders of said screw being operatively connected to said screw.
Claim 3
Dependent Claim
101 words
An injection unit for an injection moulding machine, in particular for processing thermoplastic materials, said unit comprising: a rotatable screw which is disposed in an axially displaceable material cylinder and which is axially displaceable relative to said cylinder; respective separate hydraulic cylinders for separately moving said cylinder and screw; said cylinder being fixedly connected to bar members which are displaceable by first hydraulically actuated pistons operable within said hydraulic cylinders of said cylinder; and said bar members having thereon second pistons which are slidable within said cylinders of said screw, said cylinders of said screw being operatively connected to said screw.
Claim 4
Dependent Claim
101 words
An injection unit for an injection moulding machine, in particular for processing thermoplastic materials, said unit comprising: a rotatable screw which is disposed in an axially displaceable material cylinder and which is axially displaceable relative to said cylinder; respective separate hydraulic cylinders for separately moving said cylinder and screw; said cylinder being fixedly connected to bar members which are displaceable by first hydraulically actuated pistons operable within said hydraulic cylinders of said cylinder; and said bar members having thereon second pistons which are slidable within said cylinders of said screw, said cylinders of said screw being operatively connected to said screw.
Claim 5
Dependent Claim
29 words
An injection unit as claimed in claim 1, wherein both said first pistons for displacing said bar members and said second pistons for displacing said screw are double-acting pistons.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |