Patent US3564959A successfully refreshed from Google Patents.
US3564959A
Expired / Lapsed
US
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Fine blanking press
Assignee: AIDA TEKKOSHO KK
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Filing: 1968-11-29
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Granted: 1971-02-23
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Expires: 1988-11-29
Abstract
Abstract A fine blanking press comprising a punch holder mounted on the bolster of said press; a blank holder loosely fit in said punch holder encircling a punch; a first cylinder provided in said bolster; a first piston for indirectly supporting said blank holder; a first booster for supplying oil pressure to said first cylinder; a die holder mounted in the slide of said press for supporting a die; a counter blank holder received in said die; a second piston fit in a second cylinder provided in said slide for indirectly applying oil pressure to said counter blank holder; a second booster for supplying oil pressure to a chamber above said second piston; and means for controlling and maintaining oil pressure within a chamber below said second piston.
Inventors
- 👤 Suguru Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/16; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2122; Y10T83/2124; Y10T83/2135; Y10T83/215; Y10T83/2153
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A fine blanking press, comprising a punch holder secured to the bolster of said press for holding a punch; a blank holder encircling said punch and loosely fit in said punch holder; a first piston received in a first cylinder provided in said bolster and supporting said blank holder through intermediate means under the action of oil pressure; a first booster for supplying oil pressure to said first cylinder; a die holder fixedly secured to the slide of said press for supporting a die; a counter blank holder adapted to loosely fit in said die; a second piston received in a second cylinder provided in said slide for applying pressure on said counter blank holder through intermediate means under the action of oil pressure present in an upper chamber of said second cylinder; a second booster for supplying oil pressure to an oil chamber above said second piston; and means for controlling oil pressure in a chamber below said second piston to maintain the oil presSure at a predetermined value or release such oil pressure therefrom.
Claim 2
Dependent Claim
176 words
A fine blanking press, comprising a punch holder secured to the bolster of said press for holding a punch; a blank holder encircling said punch and loosely fit in said punch holder; a first piston received in a first cylinder provided in said bolster and supporting said blank holder through intermediate means under the action of oil pressure; a first booster for supplying oil pressure to said first cylinder; a die holder fixedly secured to the slide of said press for supporting a die; a counter blank holder adapted to loosely fit in said die; a second piston received in a second cylinder provided in said slide for applying pressure on said counter blank holder through intermediate means under the action of oil pressure present in an upper chamber of said second cylinder; a second booster for supplying oil pressure to an oil chamber above said second piston; and means for controlling oil pressure in a chamber below said second piston to maintain the oil presSure at a predetermined value or release such oil pressure therefrom.
Claim 3
Dependent Claim
75 words
A fine blanking press as set forth in claim 1, in which said means for controlling oil pressure in said chamber below the second piston comprises an oil tank; a line providing communication between said tank and chamber; a check valve in said chamber; an oil cylinder in communication with said chamber; a piston received in said chamber; a rotary cam for operating said piston; and a third booster adapted to open said check valve.
Claim 4
Dependent Claim
49 words
A fine blanking press as set forth in claim 2, in which said first booster has an oil chamber which is communicated through a second check valve with an oil chamber in said first cylinder and said second check valve is adapted to be opened by said third booster.
Claim 5
Dependent Claim
53 words
A fine blanking press as set forth in claim 3 inclusive, in which said second booster has an oil chamber which is communicated with an upper chamber of a second cylinder provided in said slide and said second booster has a compressed air chamber which is communicated with a compressed air supply source.
Claim 6
Dependent Claim
66 words
A fine blanking press as set forth in claim 4, in which said press further includes a third booster having an oil chamber which is communicated through a third check valve with an oil pump which is adapted to be driven by an electric motor and said compressed air chamber of the second booster is communicated through an electromagnetic valve with said compressed air supply source.
Claim 7
Dependent Claim
50 words
A fine blanking press as set forth in claim 5, in which said press further includes a pump means adapted to automatically supply oil to the oil chamber in said first booster when the oil pressure within said first booster oil chamber has dropped to values below a predetermined value.
Claim 8
Dependent Claim
51 words
A fine blanking press as set forth in claim 6, in which said press further includes a second pump means adapted to automatically supply oil to the oil chamber of said second booster when the oil pressure within said second booster oil chamber has dropped to values below a predetermined value.
References Cited (Backward Citations)
US3107567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |