US3602670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breaking chamber for self-blasting compressed gas electric circuit breakers
Assignee: Magnano MSM SpA
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Filing: 1970-04-02
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Granted: 1971-08-31
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Expires: 1990-04-02
Abstract
Abstract An improved self-blasting compressed gas electric circuit breaker having a cylindrical member axially slidable on a fixed piston and forming a breaking chamber therebetween. The chamber contains the breaking gas and further comprises a plurality of recesses formed in one end of the cylindrical member with a like number of projections formed on the fixed piston complementary to the recesses. The recesses and projections preferably have a substantially truncated cone shape with a wide base. When a projection enters into a recess, the residual volume of the latter is reduced to a minimum upon the opening of the contacts. The recesses directly communicate with the cylindrical cavity defined between the known orifice structure and the fingers of the tulip-shaped movable contact and serve to break up the undesirable whirling motion of the gas heretofore formed in the known circuit breakers of this type.
Inventors
- 👤 Benito Jose Calvino Y Teijeiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:51
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/70; H01H33/88; H01H33/90; H01H33/91
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A self-blasting compressed gas electric circuit breaker comprising a fixed contact, a tulip-shaped movable contact, an orificed member surrounding said movable contact, a cylindrical member having therein a compressed gas chamber, a fixed piston, said cylindrical member being axially slidably mounted on said fixed piston, a plurality of recesses formed in one end of the cylindrical chamber, and a like plurality of projections fixed to said piston and directed towards said recesses, said projections and recesses having complementary shapes, said projections being received in said recesses to reduce the residual volume thereof to an absolute minimum at the end of the opening stroke of said contacts, said recesses providing direct communication between the chamber and the orificed structure around the fingers of the tulip-shaped movable contact.
Claim 2
Dependent Claim
126 words
A self-blasting compressed gas electric circuit breaker comprising a fixed contact, a tulip-shaped movable contact, an orificed member surrounding said movable contact, a cylindrical member having therein a compressed gas chamber, a fixed piston, said cylindrical member being axially slidably mounted on said fixed piston, a plurality of recesses formed in one end of the cylindrical chamber, and a like plurality of projections fixed to said piston and directed towards said recesses, said projections and recesses having complementary shapes, said projections being received in said recesses to reduce the residual volume thereof to an absolute minimum at the end of the opening stroke of said contacts, said recesses providing direct communication between the chamber and the orificed structure around the fingers of the tulip-shaped movable contact.
Claim 3
Dependent Claim
46 words
An electric circuit breaker according to claim 1 wherein said recesses and said projections have the shape of a slanting truncated cone with a wide base, the generatrix of said cone, perpendicular to a base plane, being coaxial with the fingers of the tulip-shaped movable contact.
Claim 4
Dependent Claim
45 words
An electric circuit breaker according to claim 1 in which the base section of said recesses is circular-shaped and the sum of said base sections is as high as possible and yet compatible with the inner dimensions of the chamber wherein said gas is contained.
Claim 5
Dependent Claim
150 words
A self-blasting compressed gas circuit breaker comprising a fixed contact, a tulip-shaped movable contact, a hollow cylindrical member fixedly connected to and movable with said movable contact, an orifice member extending from said cylindrical member past said movable contact to enclose said contacts in the contacts closed position, a fixed piston, said cylindrical member being axially movably mounted on said fixed piston forming a chamber therebetween, a plurality of recesses formed in said cylindrical member at the end opposite said fixed piston, said recesses providing direct communication between said chamber and said orifice member, a like plurality of projections formed on said piston and directed toward said recesses, said projections being complementary in shape to said recesses and extending therein, in a contact open position, to substantially fill the entire volume thereof whereby swirling of the gas in said chamber is reduced to a minimum upon opening of said contacts.
Claim 6
Dependent Claim
150 words
A self-blasting compressed gas circuit breaker comprising a fixed contact, a tulip-shaped movable contact, a hollow cylindrical member fixedly connected to and movable with said movable contact, an orifice member extending from said cylindrical member past said movable contact to enclose said contacts in the contacts closed position, a fixed piston, said cylindrical member being axially movably mounted on said fixed piston forming a chamber therebetween, a plurality of recesses formed in said cylindrical member at the end opposite said fixed piston, said recesses providing direct communication between said chamber and said orifice member, a like plurality of projections formed on said piston and directed toward said recesses, said projections being complementary in shape to said recesses and extending therein, in a contact open position, to substantially fill the entire volume thereof whereby swirling of the gas in said chamber is reduced to a minimum upon opening of said contacts.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |