US3688535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for electrohydraulic pressure arc control
Assignee: Continental Can Co Inc
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Filing: 1968-06-07
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Granted: 1972-09-05
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Expires: 1988-06-07
Abstract
Abstract This disclosure relates to an apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements, and includes a flexible electrohydraulic chamber wherein is supported a plurality of electrodes, means are provided for introducing a fluid medium into the chamber and for preventing erroneous arcing during the discharge of electrical energy across the electrode gap by pressurizing the fluid medium between 300-3,000 p.s.i., and preferably between 600-800 p.s.i.
Inventors
- 👤 Henry J Keinanen
- 👤 John B Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:47
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/06; B21D26/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 300-3,000 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal external telescopic relationship relative to said chamber means.
Claim 2
Dependent Claim
124 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 300-3,000 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal external telescopic relationship relative to said chamber means.
Claim 3
Dependent Claim
124 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 600-800 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal external telescopic relationship relative to said chamber means.
Claim 4
Dependent Claim
124 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 600-800 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal external telescopic relationship relative to said chamber means.
Claim 5
Dependent Claim
187 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 300-3,000 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, said pressurizing means is a hydraulic cylinder, a double-ended piston in said cylinder defining a pair of fluid chambers, means for introducing the fluid medium into one of said chambers, said one chamber being connected to said chamber means, means for introducing a pressurized fluid in the other chamber whereby said fluid medium in said chamber means is pressurized within the latter-noted range, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal external telescopic relationship relative to said chamber means.
Claim 6
Dependent Claim
187 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 300-3,000 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, said pressurizing means is a hydraulic cylinder, a double-ended piston in said cylinder defining a pair of fluid chambers, means for introducing the fluid medium into one of said chambers, said one chamber being connected to said chamber means, means for introducing a pressurized fluid in the other chamber whereby said fluid medium in said chamber means is pressurized within the latter-noted range, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal external telescopic relationship relative to said chamber means.
Claim 7
Dependent Claim
146 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 300-3,000 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, said supporting means includes an electrically conductive suspension rod for supporting one of said electrodes, said electrodes are supported in axially opposed relationship, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal telescopic relationship relative to said chamber means.
Claim 8
Dependent Claim
146 words
Apparatus for preventing erroneous arcing during electrohydraulic pressure reforming of tubular elements comprising a split mold defining a cavity, flexible chamber means in said cavity, means supporting a plurality of electrodes in said chamber means, means for introducing a fluid medium into said chamber means, means for discharging electrical current across said electrodes, means for pressurizing the fluid medium in said chamber means, prior to the operation of said discharge means, between 300-3,000 p.s.i. to prevent erroneous discharge of the current between one of said electrodes and said supporting means, said supporting means includes an electrically conductive suspension rod for supporting one of said electrodes, said electrodes are supported in axially opposed relationship, and means for removing the fluid medium from said chamber means to collapse the latter whereby a reformed tubular element is readily removable from its normal telescopic relationship relative to said chamber means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |