US4004868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection mold for laminated article
Assignee: Nissan Motor Co Ltd
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Filing: 1975-09-30
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Granted: 1977-01-25
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Expires: 1995-09-30
Abstract
Abstract To form a laminated plastic article having at least one thermoset layer, a first resin is injected into a mold from a first nozzle and solidified as usual. Then the dies are separated by a predetermined distance to create an additional cavity for a second resin layer on the solidified resin and at the same time provide a fluid passage, which connects the cavity to a second nozzle and is defined and sealed by opposite faces of the dies at their particularly shaped portions. The passage is unsealed by thoroughly separating the dies after injection of a second resin therethrough and solidification of the resin.
Inventors
- 👤 Keiki Ohdate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:39
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1635; B29C2045/1687
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
213 words
A mold for the injection molding of a laminated article plastic having a first layer of a first resin and a second layer of a different second resin, the mold comprising: a stationary die plate; a movable die plate juxtaposed against said stationary die plate in such an arrangement that the contacted end faces of said stationary and movable die plates are locally spaced from each other to form a cavity corresponding in shape and dimensions to said first layer and that the dimensions of said cavity are enlarged when said movable die plate is parted from said stationary die plate; a first sprue formed in said stationary die plate for providing fluid communication between said cavity and the atmosphere; and a second sprue formed in said movable die plate, said second sprue being defined by opposite end faces of said stationary and movable die plates, said opposite end faces being shaped such that said cavity is prevented from communicating with the atmosphere through said second sprue when said stationary and movable die plates are in full contact but allowed to communicate with the atmosphere through said second sprue when said movable die plate is parted from said stationary die plate by a predetermined distance corresponding to the thickness of said second layer.
Claim 2
Dependent Claim
213 words
A mold for the injection molding of a laminated article plastic having a first layer of a first resin and a second layer of a different second resin, the mold comprising: a stationary die plate; a movable die plate juxtaposed against said stationary die plate in such an arrangement that the contacted end faces of said stationary and movable die plates are locally spaced from each other to form a cavity corresponding in shape and dimensions to said first layer and that the dimensions of said cavity are enlarged when said movable die plate is parted from said stationary die plate; a first sprue formed in said stationary die plate for providing fluid communication between said cavity and the atmosphere; and a second sprue formed in said movable die plate, said second sprue being defined by opposite end faces of said stationary and movable die plates, said opposite end faces being shaped such that said cavity is prevented from communicating with the atmosphere through said second sprue when said stationary and movable die plates are in full contact but allowed to communicate with the atmosphere through said second sprue when said movable die plate is parted from said stationary die plate by a predetermined distance corresponding to the thickness of said second layer.
Claim 3
Dependent Claim
170 words
A mold as claimed in claim 1, wherein said stationary and movable die plates fit in tightly with each other along slide contact surfaces arranged as part of said contacted end faces to lie generally parallel to the direction of the parting movement of said movable die plate, said second sprue comprising a first groove formed on the slide contact surface of said movable die plate to extend from an end of said cavity to the contacted end face of said movable die plate, and a second groove formed on the contacted end face of said movable die plate and arranged generally perpendicular to said first groove, said second groove providing communication between said first groove and the atmosphere, the contacted end face of said stationary die plate having a projection arranged and shaped such that said projection fits in tightly with and fills in said second groove when said stationary and movable die plates are in full contact, the height of said projection being larger than said predetermined distance.
Claim 4
Dependent Claim
139 words
A mold as claimed in claim 1, wherein a third groove is formed in each of the contacted end faces of said stationary and movable die plates to surround and border said cavity, said third groove in one of said contacted end faces being equal in width to and located opposite said third groove in the other end face, said third groove being defined laterally by two parallel walls arranged parallel to said direction of the parting movement of said movable die plate, the mold further comprising a packing member of an elastomeric material received in said third grooves, said packing member having a cross-sectional shape similar to a cross-sectional shape formed by combination of said third grooves, the thickness of said packing member being larger than the sum of said distance and the depths of said third grooves.
Claim 5
Dependent Claim
33 words
A mold as claimed in claim 3, wherein the bottom of said third groove is tapered such that the depth of said third groove is largest at the inner end bordering said cavity.
Claim 6
Dependent Claim
40 words
A mold as claimed in claim 3, wherein said third groove formed in said stationary die plate has a projection extending laterally and outwardly at a section contiguous to the bottom thereof so that the cross section thereof is L-shaped.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |