US3586198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscilloscope display for electric discharge machining apparatus and the like
Assignee: DR TERRY O HOCKENBERRY
•
Filing: 1969-05-05
•
Granted: 1971-06-22
•
Expires: 1989-05-05
Abstract
Abstract Gap discharge apparatus comprises an electrode tool and workpiece spaced to form a discharge gap therebetween. A circuit connects a source of unidirectional potential and pulse generating means for generating a series of pulses at given repetition rate, in series to the tool and workpiece for inducing repetitive discharges across the gap. An oscilloscope, with angularly disposed deflecting means, has one of its deflecting means coupled to the tool and workpiece in electrical parallel with the discharge gap, and another of its deflecting means in series with the source and the tool or workpiece and the discharge gap.
Inventors
- 👤 Terry O Hockenberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:07
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; G; G01; G01R; G01R13/00; G01R13/20; G01R13/208
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
Gap discharge apparatus comprising an electrode tool and workpiece spaced to form a discharge gap therebetween, a source of unidirectional potential, pulse generating means for generating a series of pulses, means for connecting said source and said pulse-generating means in series to said tool and said workpiece for inducing repetitive discharges across said gap, an oscilloscope having angularly disposed first and second deflecting means, said first deflecting means being connected to said tool and said workpiece in electrical parallel with said gap, and circuit means for coupling said second deflecting means in series with said source and one of said tool and said workpiece and in series with said gap.
Claim 2
Dependent Claim
110 words
Gap discharge apparatus comprising an electrode tool and workpiece spaced to form a discharge gap therebetween, a source of unidirectional potential, pulse generating means for generating a series of pulses, means for connecting said source and said pulse-generating means in series to said tool and said workpiece for inducing repetitive discharges across said gap, an oscilloscope having angularly disposed first and second deflecting means, said first deflecting means being connected to said tool and said workpiece in electrical parallel with said gap, and circuit means for coupling said second deflecting means in series with said source and one of said tool and said workpiece and in series with said gap.
Claim 3
Dependent Claim
72 words
The combination according to claim 1 wherein a current level circuit is coupled between said source and one of said tool and said workpiece for establishing a plurality of machining current levels across said gap when said gap discharges occur, and multipath normalizing circuit means are coupled between said second deflecting means and said coupling circuit means for normalizing the signal applied to said second deflecting means irrespective of machining current level.
Claim 4
Dependent Claim
75 words
The combination according to claim 2 wherein selector switch means are coupled to said current level circuit for selecting one of said machining current levels, and additional switch means are coupled to a plurality of impedance paths of said normalizing circuit means for selecting one of said paths in conformance to a selected one of said machining current levels, said additional switch means being mechanically coupled to said selector switch means for simultaneous actuation thereof.
Claim 5
Dependent Claim
37 words
The combination according to claim 1 wherein said coupling circuit means include a low impedance current shunt, and said second deflecting means are coupled across said shunt for developing a deflecting signal for said second deflecting means.
Claim 6
Dependent Claim
29 words
The combination according to claim 4 wherein said current shunt is a metallic plate having a resistivity about 10 times that of copper or less to minimize inductive coupling.
Claim 7
Dependent Claim
20 words
The combination according to claim 4 wherein amplifying means are coupled between said second deflecting means and said current shunt.
Claim 8
Dependent Claim
41 words
The combination according to claim 2 wherein said normalizing circuit means include a pair of multiple contact switches and differing impedance paths are coupled respectively between corresponding contacts of said switches said paths being in inverse ratio to said current levels.
Claim 9
Dependent Claim
33 words
The combination according to claim 7 wherein an additional contact of each of said switches are connected to a minimal impedance path therebetween to establish a normalizing base for said normalizing circuit means.
Claim 10
Dependent Claim
51 words
The combination according to claim 8 wherein additional multiple contact switch means are coupled to said current level circuit for selectively coupling one or more of said paths in series with said source and said gap, said rotary switches and said additional switch means being mechanically coupled together for simultaneous actuation.
Claim 11
Dependent Claim
17 words
The combination according to claim 7 wherein said impedance paths are formed by a stepped voltage-dividing network.
Claim 12
Independent Claim
77 words
A method for monitoring and operating gap discharge machining apparatus and the like, said method comprising the steps of forming an electro-oscillograph by deflecting an oscilloscope electron beam in one plane over distances proportional to gap discharge machining current and in a plane at an angle to said first plane over distances proportional to machining gap voltage, and adjusting the machining parameters of said apparatus so that said oscillograph approximates a predetermined ideal shape for said apparatus.
Claim 13
Independent Claim
77 words
A method for monitoring and operating gap discharge machining apparatus and the like, said method comprising the steps of forming an electro-oscillograph by deflecting an oscilloscope electron beam in one plane over distances proportional to gap discharge machining current and in a plane at an angle to said first plane over distances proportional to machining gap voltage, and adjusting the machining parameters of said apparatus so that said oscillograph approximates a predetermined ideal shape for said apparatus.
Claim 14
Dependent Claim
22 words
The method according to claim 11 including the additional step of imprinting said ideal shape on an exterior surface of said screen.
Claim 15
Dependent Claim
33 words
The method accordIng to claim 11 including the additional step of normalizing said oscillograph by inversely varying a signal corresponding to said machining current with respect to a selection of machining current levels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |