US3883047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection unit for an injection molding machine
Assignee: Demag Kunststofftechnik Zweigniederlassung der Demag AG
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Filing: 1973-03-15
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Granted: 1975-05-13
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Expires: 1993-03-15
Abstract
Abstract An injection unit for injection molding machines with a plasticizing cylinder and a rotatable worm axially displaceable therein, and with an injection cylinder and a hollow piston in the latter for axially displacing the worm, while the injection cylinder is arranged between the drive motor for the worm and the plasticizing cylinder and together therewith forms a carriage which is axially displaceable on guiding spars. The hollow piston of the injection cylinder and the housing of the drive motor are connected to each other and provided with a torque support, and the drive shaft of the worm is rotatable but not axially displaceable in the hollow piston. The hollow piston has that side thereof which faces toward the plasticizing cylinder provided with a piston rod-shaped extension on which the torque support is provided which axially displaceably rests on connecting elements interconnecting the plasticizing cylinder and the injection cylinder.
Inventors
- 👤 Heinz Hofer
- 👤 Sushil Chaudhry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29C45/5008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
An injection unit for injection molding machines, which includes in combination: a plasticizing cylinder, a worm rotatably and axially displaceably arranged in said plasticizing cylinder, an injection cylinder arranged in substantially axial alignment with said plasticizing cylinder, fluid operable hollow piston means reciprocably arranged in said injection cylinder and having one side thereof facing said plasticizing cylinder and provided with a cylindrical extension extending through said injection cylinder in the direction toward said plasticizing cylinder, operatively connected to said worm for axially moving the same while permitting only rotation of said worm relative to said piston means, motor means comPrising housing means connected to said piston means, said motor means being drivingly connected to said worm for rotating said worm, said injection cylinder being located coaxially between said motor means and said plasticizing cylinder, connecting spar means interconnecting said injection cylinder and said plasticizing cylinder so as to form a carriage therewith, guiding spar means axially displaceably supporting said carriage, and torque support means arranged on said extension outside said injection cylinder, said torque support means being axially displaceably supported by said connecting spar means, so as to prevent rotation of said hollow piston means and said motor housing means.
Claim 2
Dependent Claim
200 words
An injection unit for injection molding machines, which includes in combination: a plasticizing cylinder, a worm rotatably and axially displaceably arranged in said plasticizing cylinder, an injection cylinder arranged in substantially axial alignment with said plasticizing cylinder, fluid operable hollow piston means reciprocably arranged in said injection cylinder and having one side thereof facing said plasticizing cylinder and provided with a cylindrical extension extending through said injection cylinder in the direction toward said plasticizing cylinder, operatively connected to said worm for axially moving the same while permitting only rotation of said worm relative to said piston means, motor means comPrising housing means connected to said piston means, said motor means being drivingly connected to said worm for rotating said worm, said injection cylinder being located coaxially between said motor means and said plasticizing cylinder, connecting spar means interconnecting said injection cylinder and said plasticizing cylinder so as to form a carriage therewith, guiding spar means axially displaceably supporting said carriage, and torque support means arranged on said extension outside said injection cylinder, said torque support means being axially displaceably supported by said connecting spar means, so as to prevent rotation of said hollow piston means and said motor housing means.
Claim 3
Dependent Claim
38 words
An injection unit in combination according to claim 1, which includes shield means respectively arranged on said plasticizing and injection cylinders and facing each other while having the respective adjacent ends of said connecting spar means connected thereto.
Claim 4
Dependent Claim
55 words
An injection unit in combination according to claim 1, in which said connecting spar means form cylinders surrounding a section of said guiding spar means, said last mentioned section being provided with piston means forming with said section and the respective cylinder surrounding same as a fluid pressure actuator for axially moving the injection unit.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |