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US4020709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for adjusting the opening travel of the movable plate of a molding machine for plastic materials
Assignee: F LLI SANDRETTO S SA
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Filing: 1974-07-16
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Granted: 1977-05-03
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Expires: 1994-07-16
Abstract
Abstract A device for adjusting the opening travel of a mold holder unit of a machine for molding plastic materials, comprising a movable plate which is arranged to support a portion of the mold and is actuated by at least one cylinder comprising a piston movable in a casing, said plate being movable, during the opening travel, from a first position, in which said mold is closed, to a second position in which said mold is open, is described. On the casing of the cylinder there being provided a member movable axially with respect to said casing and displaceable axially with respect to the casing by screw means in order to act as a stop for said piston during said opening travel.
Inventors
- 👤 Mario Brocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:29
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/24; B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6778; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18672
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
291 words
A device for adjusting the opening travel of a mould holder unit of a machine for moulding plastic materials, comprising: a movable plate which is arranged to support a portion of the mould, said plate being movable, during the opening travel, from a first position, in which said mould is closed, to a second position in which said mould is opened; a cylinder comprising a piston movable in a casing and apt to actuate said movable plate; a stop member mounted in said casing to act as a stop for said piston during said opening travel, the position of the stop member being variable by displacing the stop member axially with respect to the casing; a threaded stem mounted to rotate within the casing and fixed against axial movement with respect to said casing; a screw nut connected to said stop member and in threaded engagement with the stem; means arranged to prevent said screw nut from rotating with respect to said casing, so that in consequence of the rotation of said threaded stem only axial translation of said screw nut, and said stop member connected thereto, takes place; supporting and sealing means for said stop member, said supporting and sealing means including a tubular element which is provided with seats for supporting said stop member and with sealing elements for preventing said fluid from penetrating between said movable member and said tubular element; and said casing of the cylinder including an end wall, and said threaded stem and said tubular element are provided with an annular end protuberance, the casing having formed therein a cavity in which the annular protuberance of said threaded stem is rotatable and a cavity in which the annular protuberance of said tubular element is fixed.
Claim 2
Independent Claim
291 words
A device for adjusting the opening travel of a mould holder unit of a machine for moulding plastic materials, comprising: a movable plate which is arranged to support a portion of the mould, said plate being movable, during the opening travel, from a first position, in which said mould is closed, to a second position in which said mould is opened; a cylinder comprising a piston movable in a casing and apt to actuate said movable plate; a stop member mounted in said casing to act as a stop for said piston during said opening travel, the position of the stop member being variable by displacing the stop member axially with respect to the casing; a threaded stem mounted to rotate within the casing and fixed against axial movement with respect to said casing; a screw nut connected to said stop member and in threaded engagement with the stem; means arranged to prevent said screw nut from rotating with respect to said casing, so that in consequence of the rotation of said threaded stem only axial translation of said screw nut, and said stop member connected thereto, takes place; supporting and sealing means for said stop member, said supporting and sealing means including a tubular element which is provided with seats for supporting said stop member and with sealing elements for preventing said fluid from penetrating between said movable member and said tubular element; and said casing of the cylinder including an end wall, and said threaded stem and said tubular element are provided with an annular end protuberance, the casing having formed therein a cavity in which the annular protuberance of said threaded stem is rotatable and a cavity in which the annular protuberance of said tubular element is fixed.
Claim 3
Dependent Claim
32 words
A device according to claim 1, wherein said annular protuberance of said tubular element is fixed in the respective cavity of the end wall of the casing by means of a ring.
Claim 4
Dependent Claim
69 words
The device according to claim 1, wherein said piston of the cylinder has rigidly connected thereto an actuating stem, and in the end portion of said stem, in proximity to the piston, is a cylindrical cavity which is apt to receive said tubular element and is provided with a bottom wall which is apt to cooperate with said stop member in order to stop it during said opening travel.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |