US3609504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for disconnecting an auxiliary battery from a main battery during discharge of the main battery
Assignee: BARDIC SYSTEMS Ltd
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Filing: 1969-10-29
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Granted: 1971-09-28
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Expires: 1989-10-29
Abstract
Abstract In an arrangement for charging an auxiliary battery in a caravan from the charging system of a main battery driven by an internal combustion engine in a motor car, without allowing it to be discharged by the self-starter, the two batteries are connected in parallel through an overcurrent relay which disconnects the auxiliary battery if its discharge current exceeds a predetermined value. The batteries are reconnected after a period by a delayed resetting means, so that if the starter is still taking a heavy current the relay will alternately close for a short period and open for a much longer period thereby preventing discharge of the auxiliary battery.
Inventors
- 👤 John S N Barker
- 👤 Ronald H Minter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:34
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/32; H02J7/14; H02J7/1423; H02J7/50; H02J7/575; H02J7/60; H02J7/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
Apparatus for charging an auxiliary battery from a charging system driven by an internal combustion engine for a main battery, comprising; a first relay having a normally closed contact and a relay winding, a second relay having a normally open contact and a relay winding, the winding of said second relay serially connected to said normally closed contact and the series combination interconnecting said main and auxiliary batteries, said normally open contact connected to the winding of said first relay, and said first relay including means for delaying the resetting of its contact, whereby said auxiliary battery is disconnected from said main battery during current demands which exceed a predetermined threshold amperage thereby opening said normally closed contact for a period determined by said means for delaying.
Claim 2
Dependent Claim
127 words
Apparatus for charging an auxiliary battery from a charging system driven by an internal combustion engine for a main battery, comprising; a first relay having a normally closed contact and a relay winding, a second relay having a normally open contact and a relay winding, the winding of said second relay serially connected to said normally closed contact and the series combination interconnecting said main and auxiliary batteries, said normally open contact connected to the winding of said first relay, and said first relay including means for delaying the resetting of its contact, whereby said auxiliary battery is disconnected from said main battery during current demands which exceed a predetermined threshold amperage thereby opening said normally closed contact for a period determined by said means for delaying.
Claim 3
Dependent Claim
34 words
Apparatus as in claim 1 wherein said means for delaying comprises a capacitor parallelly connected to the winding of said first relay and a resistor interconnected between said capacitor and said normally open contact.
Claim 4
Dependent Claim
20 words
Apparatus as in claim 1 further comprising means for rectifying the output of an AC source for charging each battery.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |