US3773446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for moulding parts to be sintered
Assignee: TECSINTER SpA
•
Filing: 1971-08-24
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Granted: 1973-11-20
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Expires: 1991-08-24
Abstract
Abstract A device for moulding parts to be sintered by compressing powdered materials held between a fixed die and a movable die. A pair of punches extending through the dies compresses the powdered material. A pressure plate operated by the punch extending through the movable die engages the movable die and is also locked to the fixed die during the compression stroke of the punches to insure that the dies do not separate during the compression stroke.
Inventors
- 👤 B Borrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/02; B22F3/03; B01; B01J; B01J3/00; B01J3/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
A device for moulding parts to be sintered by compressing powdered materials, comprising a pair of dies movable with respect to one another between a moulding position in aligned cooperating relationship and an open position separated from one another so that the moulded part can be removed, at least one pair of punches shiftable axially toward each other in a compression stroke along axes parallel to the direction of movement of said dies, said punches cooperating with said dies to compress said powdered material, and locking means engaging and forcibly urging said dies together when said dies are in said moulding position to prevent separation of said dies during the compressing of said powdered material.
Claim 2
Independent Claim
115 words
A device for moulding parts to be sintered by compressing powdered materials, comprising a pair of dies movable with respect to one another between a moulding position in aligned cooperating relationship and an open position separated from one another so that the moulded part can be removed, at least one pair of punches shiftable axially toward each other in a compression stroke along axes parallel to the direction of movement of said dies, said punches cooperating with said dies to compress said powdered material, and locking means engaging and forcibly urging said dies together when said dies are in said moulding position to prevent separation of said dies during the compressing of said powdered material.
Claim 3
Dependent Claim
58 words
A device according to claim 1 wherein one of said dies is movable and the other of said dies is fixed, and wherein said locking means comprises a pressure plate operated by one of said punches and engaging said movable die when said die is in said moulding position and said punches are operated in said compression stroke.
Claim 4
Dependent Claim
47 words
A device according to claim 2 wherein said locking means further comprises means for positively engaging and coupling said pressure plate to said fixed die and for transmitting a force urging said pressure plate and said fixed die together while said pressure plate engages said movable die.
Claim 5
Dependent Claim
78 words
A device according to claim 3 wherein said means for positively engaging and coupling comprises at least one locking shaft attached to said pressure plate and extending outwardly therefrom toward said fixed die, and a locking member carried by said fixed die and engaging said locking shafts, said locking member applying to at least one said locking shaft a force for urging said pressure plate and said fixed die together while said pressure plate engages said movable die.
Claim 6
Dependent Claim
95 words
A device according to claim 4 wherein each of said locking shafts includes an inclined shaft shoulder and said locking member comprises an annular ring disposed about said fixed die and rotatably movable thereabout, said annular ring having corresponding inclined ring shoulders to engage said shaft shoulder and being coupled to means for rotating said annular ring to engage said shoulders, whereby rotation of said ring causes camming action between said inclined shoulders resulting in a displacing force being applied to said locking shaft and urging together of saiD pressure plate and said fixed die.
Claim 7
Dependent Claim
38 words
A device according to claim 4 wherein one of said punches is associated with said movable die and the other of said punches is associated with said fixed die, said pressure plate being operated by said one punch.
Claim 8
Dependent Claim
71 words
A device according to claim 6 wherein said pressure plate is disposed about said one punch and is relatively movable with respect thereto, and said device further comprises flange means attached to said one punch and spaced from said pressure plate and resilient compression means interposed between said flange means and said pressure plate, whereby said pressure plate is operated into engagement with said movable die through said resilient compression means.
Claim 9
Dependent Claim
40 words
A device according to claim 7 further comprising disengaging means connected between said flange means and said pressure plate to move said pressure plate out of engagement with said movable die when said one punch retracts after said compression stroke.
Claim 10
Dependent Claim
54 words
A device according to claim 8 wherein said resilient compression means comprises at least one compression spring, and said disengaging means comprises a shaft coaxial with each of said springs and having a pair of flanges at opposite ends engaging said pressure plate and said flange means to limit the outward relative movement thereof.
Claim 11
Dependent Claim
63 words
A device according to claim 9 wherein said one punch extends through an opening in said movable die substantially perpendicularly to said movable die and said pressure plate is slidable on the outer surfaces of said one punch, said pressure plate pressing said movable die against said fixed die, and wherein said compression means and said disengaging means are disposed about said die.
References Cited (Backward Citations)
US1607389A
Cited
US2389169A
Cited
US2570989A
Cited
US2653377A
Cited
US2592296A
Cited
US2823419A
Cited
US2791804A
Cited
US2883704A
Cited
US2916768A
Cited
US3020589A
Cited
US3270372A
Cited
US3382540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |