US3752622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for moulding sintering blanks
Assignee: TECSINTER SpA
•
Filing: 1971-09-21
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Granted: 1973-08-14
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Expires: 1991-09-21
Abstract
Abstract A device for moulding blanks with undercut parts to be sintered by compaction of powdered material. A two part die forms the chamber in which the blank is moulded. A pair of opposed punches pass through the die to compact the powdered material. The two parts of the die are held firmly in contact with one another during the stroke of the punches by an annular collar with inclined surface engaging oppositely inclined surfaces on the die. After the material has been compacted, the two parts of the die are separated in such a direction as not to interfere with the undercut portions of the blanks. After the die has opened, one of the punches retracts while the other continues its stroke to move the blank from between the two parts of the die.
Inventors
- 👤 S Viadana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:33
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/02; B30B15/00; B30B15/02; B30B15/022; Y; Y10; Y10S; Y10S425/00; Y10S425/005; Y10S425/035; Y10S425/058
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A device for moulding blanks to be sintered by compaction of powdered material comprising: a die of at least two parts inside which said blank is moulded, said parts being movable between a moulding position in contact with one another to define a mould cavity in which powdered material can be placed and an open position spaced from one another; a pair of opposed punches movable toward one another in a compacting stroke and passing through openings in said die to compact said powered material in said mould cavity, said punches moving along axes parallel to at least one plane of contact of said die parts with one another, means for moving said die parts to said moulding position and for holding said die parts in contact with one another in said moulding position during said compacting stroke of said punches, and means for moving said die parts to said open position at the completion of said compacting stroke of said punches.
Claim 2
Independent Claim
162 words
A device for moulding blanks to be sintered by compaction of powdered material comprising: a die of at least two parts inside which said blank is moulded, said parts being movable between a moulding position in contact with one another to define a mould cavity in which powdered material can be placed and an open position spaced from one another; a pair of opposed punches movable toward one another in a compacting stroke and passing through openings in said die to compact said powered material in said mould cavity, said punches moving along axes parallel to at least one plane of contact of said die parts with one another, means for moving said die parts to said moulding position and for holding said die parts in contact with one another in said moulding position during said compacting stroke of said punches, and means for moving said die parts to said open position at the completion of said compacting stroke of said punches.
Claim 3
Dependent Claim
69 words
A device according to claim 1 wherein said planes of contact of said die parts with one another are such that the inner surface of said die defining said mould cavity moves away from or tangent to the surface of said formed blank so as not to interfere with said surface of said formed blank when said die parts are moved from said moulding position to said open position.
Claim 4
Dependent Claim
32 words
A device according to claim 1 wherein the line of movement of said die parts between said moulding position and said open position is substantially perpendicular to the axes of said punches.
Claim 5
Dependent Claim
43 words
A device according to claim 3 wherein said die parts when in said open position are spaced outwardly from each other a distance sufficient to allow said blank to be displaced along the axes of said punches without interference from said die parts.
Claim 6
Dependent Claim
30 words
A device according to claim 1 wherein one of said punches is movable beyond said compacting stroke to eject said blank when said die parts are in said open position.
Claim 7
Dependent Claim
56 words
A device according to claim 1 wherein said moving holding means comprises a plate movable axially relative to said punches and provided with first inclined planes, said die having second inclined planes engagable by said first inclined planes to wedge said die parts together, and means for urging said movable plate into engagement with said die.
Claim 8
Dependent Claim
46 words
A device according to claim 6 wherein said separating means comprises a plurality of slots in said movable plate inclined with respect to the line of movement of said movable plate, and a plurality of corresponding projections on said die parts, said slots engaging said projections.
Claim 9
Dependent Claim
38 words
A device according to claim 7 wherein said first iNclined planes and said slots are mounted on extensions attached to said movable plate, said extensions being received during said compacting stroke in corresponding recesses in said die parts.
Claim 10
Dependent Claim
34 words
A Device according to claim 1 wherein said die parts rest upon a stationary plate having guide means for guiding the movement of said die parts between said moulding position and said open position.
Claim 11
Dependent Claim
30 words
A device according to claim 6 wherein the stroke of said movable plate with respect to said stationary plate is at least equal to the height of said moulded blank.
References Cited (Backward Citations)
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US2360528A
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US2570989A
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US3020589A
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |