Patent US2592290A successfully refreshed from Google Patents.
Patent US3889080A successfully refreshed from Google Patents.
US3889080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum interrupter shield protector
Assignee: Westinghouse Electric Corp
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Filing: 1973-12-19
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Granted: 1975-06-10
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Expires: 1993-12-19
Abstract
Abstract A vacuum type circuit interrupter having a main arcing shield, surrounding the contacts, which is provided with arc inhibiting means preventing migration of the arc root along the external surface of the main arcing shield. In one embodiment of the invention an insulating coating is applied to the external surface of the main arcing shield to prevent arc movement. In another embodiment auxiliary end shields, which are supported from the main arcing shield, are disposed around the free ends of the main arcing shield preventing arc movement to the outer surface of the main arcing shield. Auxiliary end shields can either be directly attached to the main arcing shield or connected to the main arcing shield through insulating members. In another embodiment of the invention the main arcing shield, generally tubular shaped, has a circumferential groove formed around the main arcing shield near the end. This groove which can be either inwardly projecting or outwardly projecting with respect to the longitudinal axis of the vacuum interrupter limits migration of an arc from traveling along the outside surface of the main arcing shield. The various arc inhibiting means described can be used singly or in combination to restrict arc movement.
Inventors
- 👤 Werner S Emmerich
- 👤 Francis Alan Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:03
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66261; H01H2033/66292
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
147 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and evacuated; a first end cap sealing one end of said tubular insulating envelope; a second end cap sealing the other end of said tubular insulating envelope; a stationary contact supported from said first end cap within said tubular insulating envelope; a movable contact disposed within said insulating envelope being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap there-between; a main shield generally tubular shaped partially surrounding said first contact and said second contact and being alinged with the longitudinal axis of said tubular insulating envelope; and, said main shield being metallic and including a layer of insulating material surrounding and on at least the outside ends of said main shield.
Claim 2
Dependent Claim
147 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and evacuated; a first end cap sealing one end of said tubular insulating envelope; a second end cap sealing the other end of said tubular insulating envelope; a stationary contact supported from said first end cap within said tubular insulating envelope; a movable contact disposed within said insulating envelope being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap there-between; a main shield generally tubular shaped partially surrounding said first contact and said second contact and being alinged with the longitudinal axis of said tubular insulating envelope; and, said main shield being metallic and including a layer of insulating material surrounding and on at least the outside ends of said main shield.
Claim 3
Dependent Claim
64 words
A vacuum type structure interrupter as claimed in claim 1 including: a first end cap shield being generally tubular shaped and connected to said first end cap and surrounding one end of said main shield; and, a second end cap shield having a generally tubular shape and being connected to said second end cap and partially surrounding the other end of said main shield.
Claim 4
Dependent Claim
35 words
A vacuum type circuit interrupter as claimed in claim 1 wherein: said main arcing shield is supported from said insulating envelope to be electrically isolated from said first end cap and said second end cap.
Claim 5
Dependent Claim
22 words
A vacuum type circuIt interrupter as claimed in claim 1 wherein said main arcing shield is supported from said first end cap.
Claim 6
Dependent Claim
187 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and highly evacuated; a first end cap sealing one end of said tubular insulating envelope; a second end cap sealing the other end of said tubular insulating envelope; a stationary contact disposed within said insulating envelope and being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap therebetween; a main arcing shield having a generally tubular shape partially surrounding said stationary contact and said movable contact and being aligned with the longitudinal axis of said tubular insulating envelope; a first auxiliary shield being metallic and having a generally circular cross-sectional area connected to said main arcing shield near one end and surrounding and extending toward that end of said main arcing shield; a second auxiliary shield being metallic and having a generally circular cross-sectional area and connected to said main shield near the end opposite said first auxiliary shield and surrounding and extending toward the opposite end of said main arcing shield.
Claim 7
Dependent Claim
187 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and highly evacuated; a first end cap sealing one end of said tubular insulating envelope; a second end cap sealing the other end of said tubular insulating envelope; a stationary contact disposed within said insulating envelope and being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap therebetween; a main arcing shield having a generally tubular shape partially surrounding said stationary contact and said movable contact and being aligned with the longitudinal axis of said tubular insulating envelope; a first auxiliary shield being metallic and having a generally circular cross-sectional area connected to said main arcing shield near one end and surrounding and extending toward that end of said main arcing shield; a second auxiliary shield being metallic and having a generally circular cross-sectional area and connected to said main shield near the end opposite said first auxiliary shield and surrounding and extending toward the opposite end of said main arcing shield.
Claim 8
Dependent Claim
47 words
A vacuum type circuit interrupter as claimed in claim 5 wherein said first auxiliary shield and said second auxiliary shield are shaped like frustums of a right circular cone with the inner diameter of the smaller diameter portion of the cone joined to said main arcing shield.
Claim 9
Dependent Claim
34 words
A vacuum type circuit interrupter as claimed in claim 5 wherein said first auxiliary shield and said second auxiliary shield extend past the end of said main arcing shield to which they are attached.
Claim 10
Dependent Claim
63 words
A vacuum type circuit interrupter as claimed in claim 7 including: a first end cap shield, having a generally tubular shape, extending from said first end cap and surrounding the free end of said first end shield; and, a second end cap shield, having a tubular shape, extending from said second end cap and surrounding the free end of said second end shield.
Claim 11
Dependent Claim
90 words
A vacuum type circuit interrupter as claimed in claim 5 including: a first annular insulating member connected at the inner diameter to the main arcing shield and connected at the outer diameter to said first auxiliary shield supporting said first auxiliary shield from one end of main arcing shield; and, a second annular insulating member connected at the inner diameter to the other end of said main arcing shield and connected at the outer diameter to said second auxiliary shield supporting said second auxiliary shield from said main arcing shield.
Claim 12
Dependent Claim
93 words
A vacuum type circuit interrupter as claimed in claim 9 wherein: said first auxiliary shield and said second auxiliary shield are metallic members having a circular tubular shape; and including, a first end cap shield having a circular tubular shape attached at one end to said first end cap and extending therefrom to surround the free end of said first auxiliary shield; a second end cap shield having a circular tubular shape attached at one end to said second end cap extending therefrom to surround the free end of said second auxiliary shield.
Claim 13
Dependent Claim
113 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and evacuated; a stationary contact disposed in said insulating envelope; a movable contact disposed within said insulating envelope and being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap there-between; a main arcing shield having a generally tubular shape partially surrounding said stationary contact and said movable contact and being aligned with the longitudinal axis of Said tubular insulating envelope; and, said main arcing shield having a groove formed towards each free end thereof to limit arc movement.
Claim 14
Dependent Claim
113 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and evacuated; a stationary contact disposed in said insulating envelope; a movable contact disposed within said insulating envelope and being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap there-between; a main arcing shield having a generally tubular shape partially surrounding said stationary contact and said movable contact and being aligned with the longitudinal axis of Said tubular insulating envelope; and, said main arcing shield having a groove formed towards each free end thereof to limit arc movement.
Claim 15
Dependent Claim
54 words
A vacuum type circuit interrupter as claimed in claim 11 wherein: the depressed portions of each of said grooves extends away from the longitudinal axis of said vacuum interrupter; and, the free end of said main arcing shield have a generally lip shaped portion extending away from the longitudinal axis of said vacuum interrupter.
Claim 16
Dependent Claim
54 words
A vacuum interrupter as claimed in claim 12 including a first end cap shield extending from one end of said vacuum interrupter around one end of said main arcing shield; and, a second end cap shield extending from the other end of said vacuum interrupter around the other end of said main arcing shield.
Claim 17
Dependent Claim
49 words
A vacuum interrupter as claimed in claim 11 wherein: the depressed portion of each of the grooves extend toward the longitudinal axis of said vacuum interrupter; and, the free ends of said main arcing shield have a lip shaped portion extending toward the longitudinal axis of said vacuum interrupter.
Claim 18
Dependent Claim
54 words
A vacuum interrupter as claimed in claim 13 including: a first end cap shield extending from one end of said vacuum interrupter around one end of said main arcing shield; and, a second end cap shield extending from the other end of said vacuum interrupter around the other end of said main arcing shield.
Claim 19
Dependent Claim
143 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and evacuated; a stationary contact disposed within said vacuum interrupter; a movable contact disposed within said insulating envelope and being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap there-between; a main shield having a generally tubular shape partially surrounding said first contact and said second contact and being aligned with the longitudinal axis of said tubular insulating envelope; and, arc inhibiting means attached to and extending from said main shield in proximity to the free end of said main shield for preventing any arc formed during circuit interruption from migrating to the outside surface of the main shield facing the inner walls of said tubular insulating envelope.
Claim 20
Dependent Claim
143 words
A vacuum type circuit interrupter comprising: a tubular insulating envelope being sealed and evacuated; a stationary contact disposed within said vacuum interrupter; a movable contact disposed within said insulating envelope and being relatively movable with respect to said stationary contact between a closed position in engagement with said stationary contact and an open position separated from said stationary contact to form an arcing gap there-between; a main shield having a generally tubular shape partially surrounding said first contact and said second contact and being aligned with the longitudinal axis of said tubular insulating envelope; and, arc inhibiting means attached to and extending from said main shield in proximity to the free end of said main shield for preventing any arc formed during circuit interruption from migrating to the outside surface of the main shield facing the inner walls of said tubular insulating envelope.
References Cited (Backward Citations)
US3185799A
Cited
US3185800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |