US3897531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of compressed-powder bodies
Assignee: Sintermetallwerk Krebsoege GmbH
•
Filing: 1972-08-21
•
Granted: 1975-07-29
•
Expires: 1992-08-21
Abstract
Abstract In the manufacture of bodies by isostatic compression of a powder, a press tool includes an elastically flexible jacket which is subjected to pressure in order to compress the powder. A main core, either within or surrounding the jacket, may be used to determine the shape of the body if the body is to be hollow. For the formation of a slot or other opening in the body, an auxiliary core is provided, and this core may move with the jacket during compression of the powder, or may extend through an aperture in the jacket which then slides relative to the auxiliary core during the compression operation. A piston may operate in a bore in the main core to generate pressure for urging the auxiliary core into contact with the surface of the jacket, and the piston may also be used to produce a partial vacuum for retracting the auxiliary core after formation of the body.
Inventors
- 👤 Gunter Overhoff
- 👤 Eckhard Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:14
CPC Classifications
B; B22; B22F; B22F5/00; B22F5/10; B22F5/106; B29; B29C; B29C43/00; B29C43/32; B29C43/36; B29C43/42; B30; B30B; B30B15/00; B30B15/02; B30B15/022; B22F2998/00; B29K; B29K2105/00; B29K2105/25; B29K2105/251; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
A METHOD FOR MANUFACTURING MOLDED ARTICLES FROM PRESSED POWDER MATERIAL BY COMPRESSION WITHIN MOLDING APPARATUS INCLUDING A CENTRALLY LOCATED, GENERALLY CYLINDRICAL MAIN CORE MEMBER CONSISTING ESSENTIALLY OF SOLID INELASTIC MATERIAL AN OUTER PRESSING JACKET FOAMED FROM ELASTIC MATERIAL SURROUNDING SAID MAIN CORE WITH A SPACING THEREBETWEEN FORMING A GENERALLY CYLINDRICAL ANNULAR MOLDING CAVITY, AND MEANS INCLUDING SAID OUTER PRESSING JACKET ENCLOSING SAID MOLDING CAVITY, COMPRISING: A. POSITIONING AUXILIARY CORE MEANS CONSISTING ESSENTIALLY OF SOLID INELASTIC MATERIAL TO EXTEND COMPLETELY THROUGH SAID MOLDING CAVITY TRANSVERSELY THEREOF BETWEEN SAID PRESSING JACKET AND SAID MAIN CORE MEMBER, B. FILLING SAID MOLDING CAVITY WITH MOLDABLE POWDER MATERIAL, C. APPLYING FLUID PRESSURE EXTERNALLY OF SAID PRESSING JACKET TO COMPRESS SAID POWDER MATERIAL AND BOND THE PARTICLES THEREOF INTO SAID MOLDED ARTICLE, SAID PRESSURE BEING APPLIED IN A MANNER TO ACT AGAINST SAID AUXILIARY CORE MEANS, D. DISASSEMBLING SAID APPRATUS TO PERMIT REMOVAL OF BOTH SAID AUXILIARY CORE MEANS AND SAID MOLDED ARTICLE FROM WITHIN SAID MOLDING CAVITY, AND E. REMOVING SAID MOLDED ARTICLE FROM SAID CAVITY, SAID ARTICLE BEING THEREBY FORMED WITH A TRANSVERSE APERTURE EXTENDING THERETHROUGH.
Claim 2
Independent Claim
182 words
A METHOD FOR MANUFACTURING MOLDED ARTICLES FROM PRESSED POWDER MATERIAL BY COMPRESSION WITHIN MOLDING APPARATUS INCLUDING A CENTRALLY LOCATED, GENERALLY CYLINDRICAL MAIN CORE MEMBER CONSISTING ESSENTIALLY OF SOLID INELASTIC MATERIAL AN OUTER PRESSING JACKET FOAMED FROM ELASTIC MATERIAL SURROUNDING SAID MAIN CORE WITH A SPACING THEREBETWEEN FORMING A GENERALLY CYLINDRICAL ANNULAR MOLDING CAVITY, AND MEANS INCLUDING SAID OUTER PRESSING JACKET ENCLOSING SAID MOLDING CAVITY, COMPRISING: A. POSITIONING AUXILIARY CORE MEANS CONSISTING ESSENTIALLY OF SOLID INELASTIC MATERIAL TO EXTEND COMPLETELY THROUGH SAID MOLDING CAVITY TRANSVERSELY THEREOF BETWEEN SAID PRESSING JACKET AND SAID MAIN CORE MEMBER, B. FILLING SAID MOLDING CAVITY WITH MOLDABLE POWDER MATERIAL, C. APPLYING FLUID PRESSURE EXTERNALLY OF SAID PRESSING JACKET TO COMPRESS SAID POWDER MATERIAL AND BOND THE PARTICLES THEREOF INTO SAID MOLDED ARTICLE, SAID PRESSURE BEING APPLIED IN A MANNER TO ACT AGAINST SAID AUXILIARY CORE MEANS, D. DISASSEMBLING SAID APPRATUS TO PERMIT REMOVAL OF BOTH SAID AUXILIARY CORE MEANS AND SAID MOLDED ARTICLE FROM WITHIN SAID MOLDING CAVITY, AND E. REMOVING SAID MOLDED ARTICLE FROM SAID CAVITY, SAID ARTICLE BEING THEREBY FORMED WITH A TRANSVERSE APERTURE EXTENDING THERETHROUGH.
Claim 3
Dependent Claim
72 words
The method according to claim 1 wherein said auxiliary core means is positioned within said molding cavity in abutment with the internal surface of said pressing jacket and wherein said main core is formed with recess means into which said auxiliary core means may extend, with application of said external pressure operating to move said auxiliary core means together with said pressing jacket in a direction centrally of said main core member.
Claim 4
Dependent Claim
42 words
The method according to claim 1 wherein said auxiliary core means are positioned to extend through said pressing jacket to the exterior thereof, and wherein application of said external pressure causes relative movement between said auxiliary core means and said pressing jacket.
Claim 5
Dependent Claim
54 words
The method according to claim 1 wherein said main core member comprises a generally central axis extending longitudinally thereof and wherein the said auxiliary core means comprise a generally longitudinal body member, said auxiliary core means being positioned with its longitudinal direction extending generally perpendicularly to the longitudinal axis of said main core member.
Claim 6
Dependent Claim
30 words
The method according to claim 4 wherein said auxiliary core means is retained in a fixed position relative to said main core member during application of said external molding pressure.
Claim 7
Dependent Claim
49 words
The method according to claim 4 wherein said main core member includes an internal recess into which said auxiliary core means extends and wherein said auxiliary core means is removed from said molding cavity by being retracted into said main core member to enable removal of said molded article.
References Cited (Backward Citations)
US2582922A
Cited
US3313871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |