Patent US3729283A successfully refreshed from Google Patents.
US3729283A
Expired / Lapsed
US
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Closing, locking and prestressing device for casting molds
Assignee: Individual
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Filing: 1971-03-22
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Granted: 1973-04-24
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Expires: 1991-03-22
Abstract
Abstract The device is usable for casting molds, particularly for injection and pressure molding, of the type having a fixed mold part carrier, a supporting part having a shifting device attached thereto, at least two guides extending from the fixed carrier to the supporting part, a mold part carrier movable by the shifting device along the guides and anchorable thereon, and a hydraulic prestressing device acting through the guides upon the two mold part carriers. Two guide bars extend parallel to the shifting device through the supporting part in guided relation therein, and are connected to the movable mold part carrier. At least one stop plate is movable on the shifting device and is connected to the two guide bars, and two mechanical stops provided on opposite sides of the stop plate are cooperable therewith. Each guide bar is provided, between the supporting part and the movable mold part carrier, with a piston and also supports a movable cylinder enclosing the piston. Each cylinder is connected to an ejector plate, and cavities on opposite sides of the piston, inside the associated cylinder, are controllably chareable hydraulically. The guides, adjacent that surface of the fixed mold part carrier away from the casing mold, provided prestressing pistons each movable in a cylinder on the fixed mold part carrier.
Inventors
- 👤 U Eggenberger
- 👤 H Nef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:27
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6707
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
187 words
In a closing, locking and prestressing device for casting molds, particularly for injection and pressure molding, of the type having afixed mold part carrier, a supporting part having a shifting device attached thereto, at least two guides extending from the fixed carrier to the supporting part, a mold part carrier movable by the shifting device along the guides and anchorable thereon, and a hydraulic prestressing device acting through the guides upon the two mold part carriers, the improvement comprising, in combination, relatively elongated guide means extending parallel to said shifting device through said supporting part in guided relation therein and connected to said movable mold part carrier; at least one stop plate movable along said shifting device and connected with said guide means; mechanical stops provided on opposite sides of said stop plate and engageable therewith; said guide means being provided, between said supporting part and said movable mold part carrier, with piston means supporting movable cylinder means enclosing said piston means; an ejector plate connected to said cylinder means; and cavities in said cylinder means on opposite sides of said piston means and controllably chargeable hydraulically.
Claim 2
Dependent Claim
187 words
In a closing, locking and prestressing device for casting molds, particularly for injection and pressure molding, of the type having afixed mold part carrier, a supporting part having a shifting device attached thereto, at least two guides extending from the fixed carrier to the supporting part, a mold part carrier movable by the shifting device along the guides and anchorable thereon, and a hydraulic prestressing device acting through the guides upon the two mold part carriers, the improvement comprising, in combination, relatively elongated guide means extending parallel to said shifting device through said supporting part in guided relation therein and connected to said movable mold part carrier; at least one stop plate movable along said shifting device and connected with said guide means; mechanical stops provided on opposite sides of said stop plate and engageable therewith; said guide means being provided, between said supporting part and said movable mold part carrier, with piston means supporting movable cylinder means enclosing said piston means; an ejector plate connected to said cylinder means; and cavities in said cylinder means on opposite sides of said piston means and controllably chargeable hydraulically.
Claim 3
Dependent Claim
52 words
In a closing, locking and prestressing device, the improvement claimed in claim 1, in which said guide means comprises two relatively elongated guide bars; said piston means comprising a respective piston on each guide bar and said cylinder means comprising a respective cylinder on each guide bar and closing the associated piston.
Claim 4
Dependent Claim
71 words
In a closing, locking and prestressing device, the improvement claimed in claim 2, in which each of said guides, on that part of said fixed mold part carrier facing away from the casting mold, carries a respective prestressing piston; respective cyliNders on said fixed mold part carrier each receiving a respective prestressing pinion; said support part being movable; and means connecting the opposite ends of said guides to said support part.
Claim 5
Dependent Claim
25 words
In a closing, locking and prestressing device, the improvement claimed in claim 2, in which said two mechanical stops are movable along said shifting device.
Claim 6
Dependent Claim
35 words
In a closing, locking and prestressing device, the improvement claimed in claim 4, in which said shifting device comprises an externally threaded cylinder; said mechnical stops comprising nuts threadedly adjustable along said externally threaded cylinder.
Claim 7
Dependent Claim
43 words
In a closing, locking and prestressing device, the improvement claimed in claim 5, in which said nuts have external threads; and correlated drive mechanisms in driving connection with said nuts through said external threads for adjusting said nuts along said externally threaded cylinder.
Claim 8
Dependent Claim
48 words
In a closing, locking and prestressing device, the improvement claimed in claim 2, in which said two mechanical stops are fixedly connected to said shifting device adjacent the opposite ends thereof; and two stop plates movable along said guide bars between said two mechanical stops and securable thereto.
Claim 9
Dependent Claim
63 words
In a closing, locking and prestressing device, the improvement claimed in claim 3, in which at least one of said guides is formed with a threaded bolt portion threadedly engaged with the associated prestressing piston; said associated prestressing piston being formed with teeth forming part of the transmission between the associated prestressing piston and a driving element for rotating said associated prestressing piston.
Claim 10
Dependent Claim
51 words
In a closing, locking and prestressing device, the improvement claimed in claim 8, in which said driving element and a part of the transmission in engagement with said associated prestressing piston is designed in the form of a unit attachable to the other transmission part of any of said prestressing pistons.
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |