Patent US3857658A successfully refreshed from Google Patents.
US3857658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for injector molding
Assignee: PLASTIMONDE SA
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Filing: 1973-05-25
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Granted: 1974-12-31
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Expires: 1993-05-25
Abstract
Abstract An apparatus for injection moulding in plastics materials wherein the displacements of the movable part of the mould and at least one injection piston are controlled by the pressure of a fluid delivered by at least one pump and wherein during a portion of the injection cycle the fluid pressure is varied by means which is controlled by the velocity of displacement of the movable part.
Inventors
- 👤 L Muzsnay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:13
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/164; B29C45/17; B29C45/76; B29C45/77; F; F15; F15B; F15B11/00; F15B21/00; F15B21/08; F15B21/087; B29C43/00; B29C43/32; B29C43/58; B29C2043/5833; B29C45/46; B29C45/56; B29C45/561; B29C2045/5615; B29C2045/562; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20576; F15B2211/265; F15B2211/2656; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/321; F15B2211/322; F15B2211/50; F15B2211/55
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
242 words
An injection moulding machine for injection moulding plastic material and the like, said moulding machine comprising a fixed mould portion, a cooperating movable mould member, a movable piston-operated injection system for injecting moulding material into said mould, a hydraulic system including a variable output pump and adapted to move said movable mould member, means for continuously monitoring the actual velocity of displacement of said movable mould member, means for continuously comparing the monitored velocity of displacement of said movable mould member with a predetermined velocity displacement program for the movable mould member, and means for adjusting the velocity of displacement of the movable mould member to maintain said actual velocity thereof at a value substantially equal to said predetermined velocity of displacement thereof, said movable mould member displacement velocity adjusting means including a servo-valve for controlling the output of said pump, a second hydraulic system including a second variable output pump and adapted to move said movable piston, means for continuously monitoring the actual velocity of displacement of said movable piston, means for continuously comparing the monitored velocity of displacement of said movable piston with a predetermined velocity displacement program for the movable piston, and means for adjusting the velocity of displacement of the movable piston to maintain its actual velocity at a value substantially equal to said predetermined velocity of displacement thereof, said movable piston displacement velocity adjusting means including a second servo-valve for controlling the output of said second pump.
Claim 2
Dependent Claim
242 words
An injection moulding machine for injection moulding plastic material and the like, said moulding machine comprising a fixed mould portion, a cooperating movable mould member, a movable piston-operated injection system for injecting moulding material into said mould, a hydraulic system including a variable output pump and adapted to move said movable mould member, means for continuously monitoring the actual velocity of displacement of said movable mould member, means for continuously comparing the monitored velocity of displacement of said movable mould member with a predetermined velocity displacement program for the movable mould member, and means for adjusting the velocity of displacement of the movable mould member to maintain said actual velocity thereof at a value substantially equal to said predetermined velocity of displacement thereof, said movable mould member displacement velocity adjusting means including a servo-valve for controlling the output of said pump, a second hydraulic system including a second variable output pump and adapted to move said movable piston, means for continuously monitoring the actual velocity of displacement of said movable piston, means for continuously comparing the monitored velocity of displacement of said movable piston with a predetermined velocity displacement program for the movable piston, and means for adjusting the velocity of displacement of the movable piston to maintain its actual velocity at a value substantially equal to said predetermined velocity of displacement thereof, said movable piston displacement velocity adjusting means including a second servo-valve for controlling the output of said second pump.
References Cited (Backward Citations)
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |