US3909683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor with overheating protection
Assignee: Robert Bosch GmbH
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Filing: 1974-06-13
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Granted: 1975-09-30
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Expires: 1994-06-13
Abstract
Abstract Reliable disconnection of at least one lead wire in case of failure in the capacitor winding is obtained by providing a cavity adjacent one or both of the vapordeposited contact bridges at the ends of the capacitor winding. Reliability of disconnection in response to pressure is increased by reinforcing the contact bridges with a layer of resin and, further, by a metal disk embedded in the resin layer. The same hollow spaces are usable for disposing a fusible portion of one of the lead wires for disconnection under overcurrent conditions.
Inventors
- 👤 Zdenek Kysely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:15
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
An electrical capacitor of the type comprising wound electrode and dielectric layers forming a cylindrical body, metallic contact bridges on the end faces of said body for contact with the respective electrode layers, and a disconnecting device responsive to internal over-pressure, all of the foregoing being imbedded in a synthetic resin material within a casing for the assembly, which capacitor embodies the improvement that: in the vicinity of at least one of said end faces of said cylindrical body a yielding hollow space is provided in the surrounding synthetic resin material between the adjacent metallic bridge and the facing end of said casing.
Claim 2
Dependent Claim
103 words
An electrical capacitor of the type comprising wound electrode and dielectric layers forming a cylindrical body, metallic contact bridges on the end faces of said body for contact with the respective electrode layers, and a disconnecting device responsive to internal over-pressure, all of the foregoing being imbedded in a synthetic resin material within a casing for the assembly, which capacitor embodies the improvement that: in the vicinity of at least one of said end faces of said cylindrical body a yielding hollow space is provided in the surrounding synthetic resin material between the adjacent metallic bridge and the facing end of said casing.
Claim 3
Dependent Claim
49 words
A capacitor as defined in claim 1 in which said hollow space is formed by an air inclusion within the end of a sleeve-like web tightly surrounding said cylindrical body and having an end overlapping the end of saId body in the vicinity of the adjacent metallic contact bridge.
Claim 4
Dependent Claim
26 words
A capacitor as defined in claim 1 in which the contact bridge facing said hollow space is covered with a thin layer of synthetic resin material.
Claim 5
Dependent Claim
22 words
A capacitor as defined in claim 3 in which a stiffening disc is imbedded in said thin layer of synthetic resin material.
Claim 6
Dependent Claim
43 words
A capacitor as defined in claim 1 in which lead wires are respectively connected to said contact bridges and in which each lead wire that connects with a contact bridge adjacent a hollow space is positioned to pass freely through said hollow space.
Claim 7
Dependent Claim
33 words
A capacitor as defined in claim 5 in which a lead wire passing through a hollow space as aforesaid is formed, at least in part, of fusible material to provide a protective fuse.
Claim 8
Dependent Claim
107 words
An electrical capacitor of the type comprising wound electrode and dielectric layers forming a cylindrical body, metallic contact bridges on the end faces of said body for contact with the respective electrode layers, and a disconnecting device responsive to internal over-pressure, all of the foregoing being embedded in a substantially non-porous synthetic resin material within a casing for the assembly, which capacitor embodies the improvement that: in the vicinity of at least one of said end faces of said cylindrical body a yielding foam filled space is provided in the surrounding aforesaid synthetic resin material between the adjacent metallic bridge and the facing end of said casing.
Claim 9
Dependent Claim
107 words
An electrical capacitor of the type comprising wound electrode and dielectric layers forming a cylindrical body, metallic contact bridges on the end faces of said body for contact with the respective electrode layers, and a disconnecting device responsive to internal over-pressure, all of the foregoing being embedded in a substantially non-porous synthetic resin material within a casing for the assembly, which capacitor embodies the improvement that: in the vicinity of at least one of said end faces of said cylindrical body a yielding foam filled space is provided in the surrounding aforesaid synthetic resin material between the adjacent metallic bridge and the facing end of said casing.
References Cited (Backward Citations)
US3185905A
Cited
US3573565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |