US3833204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding machine injection unit
Assignee: Individual
•
Filing: 1972-11-15
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Granted: 1974-09-03
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Expires: 1992-11-15
Abstract
Abstract An injection unit for an injection molding machine in which selective ones of the hydraulic drive cylinders of the unit are provided with sleeve members on which the piston assemblies of those drive cylinders are mounted. These sleeves and those hydraulic cylinders which effect the movement of the injection unit relative to the injection molding machine are fastened to one of two supporting bridges while the hydraulic cylinders which effect a movement of a conveying worm of the unit relative to a plasticizing cylinder of the unit are fastened to the other of the supporting bridges. Each sleeve is moreover coaxially flanged to a respective one of the hydraulic cylinders which effect the movement of the injection unit relative to the injection molding machine, with the pistons of these cylinders being directly mounted on a respective one of the unit supporting struts.
Inventors
- 👤 K Hehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:11
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/03; B29C45/07; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29C45/5008; B29C45/83
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
205 words
In an injection unit, particularly for an injection molding machine for processing plastics, the injection unit defining an injection axis and including two supporting bridges, at least one first hydraulic drive cylinder, additional hydraulic cylinders, piston assemblies mounted within the hydraulic cylinders, supporting struts supporting both supporting bridges, the hydraulic drive cylinders, and the additional hydraulic cylinders, and a plurality of sleeves each having a slide surface enclosing and being slidably mounted on a respective supporting strut, each sleeve being provided with a recess in the area of its slide surface, and supporting the piston assemblies of the additional hydraulic cylinders, the plurality of sleeves being fastened to one of the supporting bridges and the additional hydraulic cylinders being fastened to the other of the supporting bridges, the improvement wherein there are a plurality of first hydraulic drive cylinders equal in number to said additional hydraulic cylinders, and wherein said first hydraulic drive cylinders are fastened to that supporting bridge to which the plurality of sleeves are fastened, with each sleeve being coaxially fastened to a respective one of said first hydraulic drive cylinders, and with the piston assemblies of said first hydraulic drive cylinders being mounted on a respective one of the supporting struts.
Claim 2
Dependent Claim
205 words
In an injection unit, particularly for an injection molding machine for processing plastics, the injection unit defining an injection axis and including two supporting bridges, at least one first hydraulic drive cylinder, additional hydraulic cylinders, piston assemblies mounted within the hydraulic cylinders, supporting struts supporting both supporting bridges, the hydraulic drive cylinders, and the additional hydraulic cylinders, and a plurality of sleeves each having a slide surface enclosing and being slidably mounted on a respective supporting strut, each sleeve being provided with a recess in the area of its slide surface, and supporting the piston assemblies of the additional hydraulic cylinders, the plurality of sleeves being fastened to one of the supporting bridges and the additional hydraulic cylinders being fastened to the other of the supporting bridges, the improvement wherein there are a plurality of first hydraulic drive cylinders equal in number to said additional hydraulic cylinders, and wherein said first hydraulic drive cylinders are fastened to that supporting bridge to which the plurality of sleeves are fastened, with each sleeve being coaxially fastened to a respective one of said first hydraulic drive cylinders, and with the piston assemblies of said first hydraulic drive cylinders being mounted on a respective one of the supporting struts.
Claim 3
Dependent Claim
68 words
An injection unit as defined in claim 1, further comprising: a clamping plate to which the supporting struts are mounted; and a plasticizing cylinder and a conveying worm movable in the direction of the injection axis by said plurality of first hydraulic drive cylinders, and relative to each other by said additional hydraulic cylinders, both the plasticizing cylinder and the conveying worm being supported on the supporting struts.
Claim 4
Dependent Claim
48 words
An injection unit as defined in claim 1, wherein each sleeve further includes a flange portion coaxially fastening said sleeves to a respective one of said first hydraulic drive cylinders, and each flange portion constitutes a cylinder cover for the hydraulic drive cylinder to which it is fastened.
Claim 5
Dependent Claim
55 words
An injection unit as defined in claim 1, wherein the recesses of said sleeves are annular chamber-type recesses which serve as lubricating pockets, and each sleeve and the piston assembly mounted thereon divides the hydraulic cylinder chamber associated therewith into separate chambers with one of said chambers being in communication with its respective chamber-type recess.
Claim 6
Dependent Claim
33 words
An injection unit as defined in claim 4, wherein each sleeve further includes a helical groove in the area of the slide surface which connects the respective sleeve recess with the cylinder chamber.
Claim 7
Dependent Claim
47 words
An injection unit as defined in claim 1, wherein a first one of said supporting bridges has bores formed therein, and wherein the sleeves are fastened to the second of said supporting bridges and extend into a respective one of said bores of the first supporting bridge.
Claim 8
Dependent Claim
68 words
An injection unit as defined in claim 6, wherein each sleeve and the piston assembly mounted thereon divides the hydraulic cylinder chamber associated therewith into separate chambers, and each strut and piston assembly mounted thereon divides the hydraulic cylinder chamber associated therewith into separate chambers, and wherein a connecting line is provided for connecting adjacent ones of the separate chambers, said connected chambers being in different hydraulic cylinders.
Claim 9
Dependent Claim
49 words
An injection unit as defined in claim 1, wherein the sleeves are fastened to a first one of said supporting bridges and wherein the second one of said supporting bridges has bores formed therein, said sleeves extending into a respective one of said bores of the second supporting bridge.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |