Patent US3695130A successfully refreshed from Google Patents.
US3695130A
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US
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High velocity press
Assignee: Olivetti SpA
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Filing: 1971-09-14
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Granted: 1972-10-03
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Expires: 1991-09-14
Abstract
Abstract Presses for metal or other hard material in which the driving power for the punch is derived primarily from the kinetic energy of the punch element and the supporting structure moving at high speed. Capacitive discharge through a coil produces an electromagnetic interaction with a conductive plate adjacent to the coil and secured to the punch element to achieve the high velocity and therefore the desired kinetic energy, which energy is transformed to mechanical punching force.
Inventors
- 👤 Renzo Fedrigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:05
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/20; B30; B30B; B30B1/00; B30B1/42; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/869; Y10T83/8765
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A method for electrodynamically impelling toward a work piece a punch mounted for rectilinear motion in a press, said press including a substantially planar element of highly conductive material fixed to said punch normal to the direction of motion thereof, comprising the steps of: positioning said punch with said planar element adjacent a planar coil, said element including an area substantially congruent with said coil, energizing said coil with a low frequency pulse of electrical energy for generating flux linking said conductive element to repel said element from said coil, the frequency of said pulse being chosen so that said pulse continues to accelerate said punch over a stroke of at least 10 percent of the diameter of said coil.
Claim 2
Independent Claim
120 words
A method for electrodynamically impelling toward a work piece a punch mounted for rectilinear motion in a press, said press including a substantially planar element of highly conductive material fixed to said punch normal to the direction of motion thereof, comprising the steps of: positioning said punch with said planar element adjacent a planar coil, said element including an area substantially congruent with said coil, energizing said coil with a low frequency pulse of electrical energy for generating flux linking said conductive element to repel said element from said coil, the frequency of said pulse being chosen so that said pulse continues to accelerate said punch over a stroke of at least 10 percent of the diameter of said coil.
Claim 3
Dependent Claim
65 words
The method according to claim 1 wherein said pulse is the first half cycle of a damped pseudosinusoid current wave form generated by discharging a capacitor through said coil, further including the step of using the energy stored in said capacitor at the end of said first half current cycle as a portion of the input energy for the next actuation cycle of the press.
Claim 4
Dependent Claim
21 words
The method of claim 1 further including the steps of cooling said coil during operation by circulating a cooling fluid therearound.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said coil is spirally wound in a single level.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the duration of the pulse is at least 1/340 sec.
References Cited (Backward Citations)
US2711792A
Cited
US3040610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |