US3695809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertically closing press for injection molding thermoplastic, thermosetting and elastomeric materials
Assignee: Mas Hydraulic & Vulcanizing Machinery Co SRL
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Filing: 1970-07-31
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Granted: 1972-10-03
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Expires: 1990-07-31
Abstract
Abstract A vertically closing press for injection molding comprising an upper platen and a lower platen, an upwardly mounted hydraulic cylinder for producing a quick approach of the upper platen to the lower platen, a transfer chamber fast with and located below the lower platen, and a combination of a hydraulic cylinder for closing and clamping a mold between the platens having a piston forming a further cylinder the piston rod of which provides a transfer plunger in the transfer chamber. An adjustable backingup device for the upper platen is provided between the latter and the upper beam of the frame, the device being retractable laterally to permit raising of the upper platen.
Inventors
- 👤 Dino Vicini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:44
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
255 words
A vertically closing press for injection molding of thermoplastic, thermosetting, elastomeric and similar, comprising in combination, a frame, a first and second platen adapted for movement relative to each other, a rigid adjustable back-up device mounted on said first platen and positioned between said first platen and said frame, said first and second platens adapted for operatively supporting an upper and lower die of a mold assembly, a first hydraulic piston and cylinder assembly operatively connected between said frame and said back-up device for displacing said back-up device together with said first platen in the direction of said second platen, said frame having a rigid abutment means adapted for engagement by the side of said back-up device opposite said first platen, displacement means for moving said back-up device in a direction transverse to said first platen between a first position wherein said back-up device is below said abutment means for carrying the mold clamping thrust exerted during engagement of said upper and lower dies and a second position wherein said back-up device is clear of said abutment means to permit displacement of said first platen toward said abutment means, a second piston and cylinder assembly operatively connected between said second platen and the end of said frame opposite said first piston and cylinder assembly, said second cylinder being rigidly secured to said frame and said second piston being operatively connected to said second platen, said second piston and cylinder assembly adapted to be extended to apply a clamping force to said first and second dies.
Claim 2
Dependent Claim
255 words
A vertically closing press for injection molding of thermoplastic, thermosetting, elastomeric and similar, comprising in combination, a frame, a first and second platen adapted for movement relative to each other, a rigid adjustable back-up device mounted on said first platen and positioned between said first platen and said frame, said first and second platens adapted for operatively supporting an upper and lower die of a mold assembly, a first hydraulic piston and cylinder assembly operatively connected between said frame and said back-up device for displacing said back-up device together with said first platen in the direction of said second platen, said frame having a rigid abutment means adapted for engagement by the side of said back-up device opposite said first platen, displacement means for moving said back-up device in a direction transverse to said first platen between a first position wherein said back-up device is below said abutment means for carrying the mold clamping thrust exerted during engagement of said upper and lower dies and a second position wherein said back-up device is clear of said abutment means to permit displacement of said first platen toward said abutment means, a second piston and cylinder assembly operatively connected between said second platen and the end of said frame opposite said first piston and cylinder assembly, said second cylinder being rigidly secured to said frame and said second piston being operatively connected to said second platen, said second piston and cylinder assembly adapted to be extended to apply a clamping force to said first and second dies.
Claim 3
Dependent Claim
91 words
A vertically closing press for injection molding as set forth in claim 1, wherein said back-up device comprises a rigid basic block having a predetermined height and associated with said first platen, and a plurality of auxiliary shim blocks, each having a height equal to a fraction of the basic height of said basic block, said shim blocks arranged in a superposed relation on said base block, and fastening means provided for securing each auxiliary shim block to the immediate underlying block and the lowermost shim block to said basic block.
Claim 4
Dependent Claim
47 words
A vertically closing press for injection molding as set forth in claim 1, wherein said displacement means comprises a hydraulic piston and cylinder assembly operatively connected between said frame and said back-up device to move said back-up device in a transverse direction relative to said first platen.
Claim 5
Dependent Claim
50 words
A vertically closing press for injection molding as set forth in claim 2, wherein said piston of said secOnd hydraulic piston and cylinder assembly has a stroke at least equal to the thickness of at least one of said shim blocks associated with said basic block of said back-up device.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |