Patent US3878746A successfully refreshed from Google Patents.
US3878746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burless blanking machine and process
Assignee: International Business Machines Corp
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Filing: 1973-11-23
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Granted: 1975-04-22
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Expires: 1993-11-23
Abstract
Abstract In a triple-action blanking press comprising a frame, a fixed die, a stripper, a clamping plate, a punch, a drive slide driving the punch and actuating means, the stripper can project from the die and an elastic member is interposed between the punch and the drive slide. The machine adjustment is such that during a first part of the machine cycle the stripper acts as a punch and the clamping plate as a die so that the piece is partially blanked on its punch side; during said operation the elastic member is completely compressed and the connection between the drive slide and the punch becomes rigid; then the punch acts just as a punch and forces the piece into the die until it is completely blanked. The operation provides completely burless blanked pieces.
Inventors
- 👤 Werter Carmeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:55
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/16; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0581; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2122; Y10T83/2129; Y10T83/2135; Y10T83/215; Y10T83/2153; Y10T83/869; Y10T83/8776; Y10T83/8821; Y10T83/8825; Y10T83/8835
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
A blanking press comprising: a frame; a die, having a die aperture, said die being rigidly secured to said frame; a stripper disposed within said die aperture and slidably guided by said die aperture, said stripper projecting from the outer surface of said die during one predetermined period of the machine cycle; a clamping plate opposed to said outer surface of said die for clamping the material to be blanked against said outer surface of said die, said clamping plate being provided with an aperture, said aperture having essentially the same section of and being essentially aligned with said die aperture; a punch disposed within said aperture of said clamping plate, said punch being slidably guided by said aperture; a drive slide; means for connecting said punch and said drive slide, said means being able to maintain the work surface of said punch substantially flush with the work surface of said clamping plate during another predetermined period of the machine cycle, said means being further able to allow said punch to recede into said aperture of said clamping plate a predetermined distance after which said means supply a direct transmission of the motion of said drive slide to said punch; means for actuating said stripper; means for actuating said clamping plate; and means for actuating said drive slide.
Claim 2
Dependent Claim
218 words
A blanking press comprising: a frame; a die, having a die aperture, said die being rigidly secured to said frame; a stripper disposed within said die aperture and slidably guided by said die aperture, said stripper projecting from the outer surface of said die during one predetermined period of the machine cycle; a clamping plate opposed to said outer surface of said die for clamping the material to be blanked against said outer surface of said die, said clamping plate being provided with an aperture, said aperture having essentially the same section of and being essentially aligned with said die aperture; a punch disposed within said aperture of said clamping plate, said punch being slidably guided by said aperture; a drive slide; means for connecting said punch and said drive slide, said means being able to maintain the work surface of said punch substantially flush with the work surface of said clamping plate during another predetermined period of the machine cycle, said means being further able to allow said punch to recede into said aperture of said clamping plate a predetermined distance after which said means supply a direct transmission of the motion of said drive slide to said punch; means for actuating said stripper; means for actuating said clamping plate; and means for actuating said drive slide.
Claim 3
Dependent Claim
218 words
A blanking press comprising: a frame; a die, having a die aperture, said die being rigidly secured to said frame; a stripper disposed within said die aperture and slidably guided by said die aperture, said stripper projecting from the outer surface of said die during one predetermined period of the machine cycle; a clamping plate opposed to said outer surface of said die for clamping the material to be blanked against said outer surface of said die, said clamping plate being provided with an aperture, said aperture having essentially the same section of and being essentially aligned with said die aperture; a punch disposed within said aperture of said clamping plate, said punch being slidably guided by said aperture; a drive slide; means for connecting said punch and said drive slide, said means being able to maintain the work surface of said punch substantially flush with the work surface of said clamping plate during another predetermined period of the machine cycle, said means being further able to allow said punch to recede into said aperture of said clamping plate a predetermined distance after which said means supply a direct transmission of the motion of said drive slide to said punch; means for actuating said stripper; means for actuating said clamping plate; and means for actuating said drive slide.
Claim 4
Dependent Claim
218 words
A blanking press comprising: a frame; a die, having a die aperture, said die being rigidly secured to said frame; a stripper disposed within said die aperture and slidably guided by said die aperture, said stripper projecting from the outer surface of said die during one predetermined period of the machine cycle; a clamping plate opposed to said outer surface of said die for clamping the material to be blanked against said outer surface of said die, said clamping plate being provided with an aperture, said aperture having essentially the same section of and being essentially aligned with said die aperture; a punch disposed within said aperture of said clamping plate, said punch being slidably guided by said aperture; a drive slide; means for connecting said punch and said drive slide, said means being able to maintain the work surface of said punch substantially flush with the work surface of said clamping plate during another predetermined period of the machine cycle, said means being further able to allow said punch to recede into said aperture of said clamping plate a predetermined distance after which said means supply a direct transmission of the motion of said drive slide to said punch; means for actuating said stripper; means for actuating said clamping plate; and means for actuating said drive slide.
Claim 5
Dependent Claim
85 words
A blanking press according to claim 1, wherein said means for connecting said punch and said drive slide comprise essentially a first plate secured to said punch, a second plate secured to said drive slide and a spring at least partially nested between said plates within a suitable cavity formed in said plates, so that said punch and said drive slide can approach compressing said spring until said plates meet and form a rigid transmission of the motion from said drive slide to said punch.
Claim 6
Dependent Claim
38 words
A blanking press according to claim 1, wherein said means for actuating said stripper is hydraulic means, said means for actuating said clamping plate is hydraulic means and said means for actuating said drive slide is mechanical means.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |