US3969649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for bicycle lighting systems
Assignee: Individual
•
Filing: 1974-10-15
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Granted: 1976-07-13
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Expires: 1994-10-15
Abstract
Abstract A circuit arrangement for bicycle lighting systems including a dynamo having an output winding. Front and rear lamps connected in series across the winding. A tap divides the winding into two parts, the lamps each connecting to a corresponding winding part and interconnecting at a junction joint. An impedance is interposed between the tap and lamp junction point. The number of turns and resistances of the winding parts are of value such that the junction point and tap are at the same potential, establishing system equilibrium, under normal operating conditions, despite variation in dynamo voltage and lamp resistance with bicycle speed. The impedance may be provided as the inherent resistance of a further winding connecting the junction point and tap and compensating for a difference in winding part resistance and turns ratios required for equilibrium. A further impedance may be coupled across the rear lamp.
Inventors
- 👤 Walter Emil Wilhelm Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
B; B62; B62J; B62J6/00; B62J6/01; H; H02; H02K; H02K21/00; H02K21/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A circuit arrangement for bicycle lighting systems and the like, comprising: a dynamo having a winding provided with a tap dividing the winding into two parts; a front lamp connected to a first of said winding parts; a rear lamp connected to the second winding part, said lamps being interconnected by a junction point; an impedance connected between the tap and the lamp junction point and of preselected value; the number of turns and the resistance of said first winding part and the number of turns and resistance of said second winding part being such as to establish system equilibrium, wherein the potential of the tap is the same as the potential of the lamp junction point, during normal operation conditions with lamp resistances varying.
Claim 2
Dependent Claim
125 words
A circuit arrangement for bicycle lighting systems and the like, comprising: a dynamo having a winding provided with a tap dividing the winding into two parts; a front lamp connected to a first of said winding parts; a rear lamp connected to the second winding part, said lamps being interconnected by a junction point; an impedance connected between the tap and the lamp junction point and of preselected value; the number of turns and the resistance of said first winding part and the number of turns and resistance of said second winding part being such as to establish system equilibrium, wherein the potential of the tap is the same as the potential of the lamp junction point, during normal operation conditions with lamp resistances varying.
Claim 3
Dependent Claim
22 words
A circuit arrangement as claimed in claim 1, wherein said impedance is a resistance current limiter active only if a lamp breaks.
Claim 4
Dependent Claim
125 words
A circuit arrangement for bicycle lighting systems and the like, comprising: a dynamo having a winding provided with a tap dividing the winding into two parts; a front lamp circuit connected to a first of said winding parts; a rear lamp circuit connected to the second winding part, and a junction point connecting said first and second lamp circuits; a further winding connected between the tap and the lamp junction point; the resistances of said first and second winding parts being related to the resistances of said first and second lamps, respectively, and the winding direction and number of turns of said further winding being such as to establish system equilibrium, wherein substantially no current flows in the said further winding during normal operation conditions.
Claim 5
Dependent Claim
125 words
A circuit arrangement for bicycle lighting systems and the like, comprising: a dynamo having a winding provided with a tap dividing the winding into two parts; a front lamp circuit connected to a first of said winding parts; a rear lamp circuit connected to the second winding part, and a junction point connecting said first and second lamp circuits; a further winding connected between the tap and the lamp junction point; the resistances of said first and second winding parts being related to the resistances of said first and second lamps, respectively, and the winding direction and number of turns of said further winding being such as to establish system equilibrium, wherein substantially no current flows in the said further winding during normal operation conditions.
Claim 6
Dependent Claim
39 words
A circuit arrangement as claimed in claim 3, wherein the resistance of the further winding defines a current protective resistance for limiting the voltage on one said lamp to a non-damaging level upon failure of the other said lamp.
Claim 7
Dependent Claim
21 words
A circuit arrangement as claimed in claim 4, wherein a further impedance is connected in parallel across the rear lamp circuit.
Claim 8
Dependent Claim
14 words
A device as claimed in claim 5, wherein said further impedance is a resistance.
Claim 9
Dependent Claim
19 words
A device as claimed in claim 5, wherein said further impedance is a bifilar winding having an inherent resistance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |