US3562580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp-failure detection and change device
Assignee: 3M Co
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Filing: 1969-01-10
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Granted: 1971-02-09
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Expires: 1989-01-10
Abstract
Abstract A device for use in a light projector to automatically replace an expired main lamp with a spare lamp. The main lamp and the spare lamp are socketed in a lamp-changing mechanism which is actuated in response to the operation of a solid-state lampfailure detector. The detector senses the failure of the main lamp and automatically energizes the spare lamp, an indicating lamp and a release means to permit the lamp changing mechanism to remove the main lamp from a focus position in the projector and advance said spare lamp into the focus position.
Inventors
- 👤 Jack P Blomgren
- 👤 Stanley L Ross
- 👤 Peter A Lind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:38
CPC Classifications
F; F21; F21V; F21V19/00; F21V19/04; G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2006; G03B21/2013; G03B21/206; H; H05; H05B; H05B39/00; H05B39/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
348 words
A device having particular utility in a light projecting system for detecting the failure of a main lamp and automatically replacing the expired main lamp with a spare lamp, said device comprising in combination; 1. a frame; 2. a lamp changing mechanism having a. a movable lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in said predetermined position when said support is in said second set position; c. actuation means operatively connected to said support for moving said spare lamp support between said first set position and said second set position; d. release means operatively connected to said movable lamp support for releasing said support to permit said actuation means to move said laMp support from said first set position to said second set position; 3. a lamp failure detector having a. a first circuit including said main lamp; b. a second circuit including said spare lamp and electrically connected to said release means; c. first switch means operatively connected to said first circuit and said second circuit for sensing an electrical opening within said first circuit and for connecting said second circuit to a source of electrical energy to afford energization of said spare lamp and said release means to permit movement of said lamp support, said first switch means including 1. coupling means operatively connected to said first circuit and said second circuit for producing a current flow through a portion of said second circuit when current is flowing through said first circuit; and 2. a first thyristor operatively connected to said second circuit and having a first gate lead, and a pellet portion having a first common lead and a first high lead, said first gate lead electrically connected to said coupling means to maintain said pellet portion electrically closed when current is flowing through said first circuit.
Claim 2
Independent Claim
348 words
A device having particular utility in a light projecting system for detecting the failure of a main lamp and automatically replacing the expired main lamp with a spare lamp, said device comprising in combination; 1. a frame; 2. a lamp changing mechanism having a. a movable lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in said predetermined position when said support is in said second set position; c. actuation means operatively connected to said support for moving said spare lamp support between said first set position and said second set position; d. release means operatively connected to said movable lamp support for releasing said support to permit said actuation means to move said laMp support from said first set position to said second set position; 3. a lamp failure detector having a. a first circuit including said main lamp; b. a second circuit including said spare lamp and electrically connected to said release means; c. first switch means operatively connected to said first circuit and said second circuit for sensing an electrical opening within said first circuit and for connecting said second circuit to a source of electrical energy to afford energization of said spare lamp and said release means to permit movement of said lamp support, said first switch means including 1. coupling means operatively connected to said first circuit and said second circuit for producing a current flow through a portion of said second circuit when current is flowing through said first circuit; and 2. a first thyristor operatively connected to said second circuit and having a first gate lead, and a pellet portion having a first common lead and a first high lead, said first gate lead electrically connected to said coupling means to maintain said pellet portion electrically closed when current is flowing through said first circuit.
Claim 3
Dependent Claim
134 words
a lamp changing mechanism having a. a movable lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in said predetermined position when said support is in said second set position; c. actuation means operatively connected to said support for moving said spare lamp support between said first set position and said second set position; d. release means operatively connected to said movable lamp support for releasing said support to permit said actuation means to move said laMp support from said first set position to said second set position;
Claim 4
Dependent Claim
134 words
a lamp changing mechanism having a. a movable lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in said predetermined position when said support is in said second set position; c. actuation means operatively connected to said support for moving said spare lamp support between said first set position and said second set position; d. release means operatively connected to said movable lamp support for releasing said support to permit said actuation means to move said laMp support from said first set position to said second set position;
Claim 5
Dependent Claim
32 words
The device according to claim 1 wherein said release means includes an electrical solenoid electrically connected to said second circuit for activating said actuation means upon operation of said first switch means.
Claim 6
Dependent Claim
54 words
a first thyristor operatively connected to said second circuit and having a first gate lead, and a pellet portion having a first common lead and a first high lead, said first gate lead electrically connected to said coupling means to maintain said pellet portion electrically closed when current is flowing through said first circuit.
Claim 7
Dependent Claim
54 words
a first thyristor operatively connected to said second circuit and having a first gate lead, and a pellet portion having a first common lead and a first high lead, said first gate lead electrically connected to said coupling means to maintain said pellet portion electrically closed when current is flowing through said first circuit.
Claim 8
Dependent Claim
86 words
a lamp failure detector having a. a first circuit including said main lamp; b. a second circuit including said spare lamp and electrically connected to said release means; c. first switch means operatively connected to said first circuit and said second circuit for sensing an electrical opening within said first circuit and for connecting said second circuit to a source of electrical energy to afford energization of said spare lamp and said release means to permit movement of said lamp support, said first switch means including
Claim 9
Dependent Claim
86 words
a lamp failure detector having a. a first circuit including said main lamp; b. a second circuit including said spare lamp and electrically connected to said release means; c. first switch means operatively connected to said first circuit and said second circuit for sensing an electrical opening within said first circuit and for connecting said second circuit to a source of electrical energy to afford energization of said spare lamp and said release means to permit movement of said lamp support, said first switch means including
Claim 10
Dependent Claim
57 words
The device according to claim 2 wherein said solenoid is connected to said second circuit by a third circuit, said third circuit including second switch means for opening said third circuit to deenergize said solenoid upon expiration of a duration of time from said first switch means connecting said second circuit to the source of electrical energy.
Claim 11
Dependent Claim
96 words
The device according to claim 3 wherein said second switch means includes: a. a transistor having a base, emitter and collector, said emitter and collector electrically in series circuit with said solenoid; b. a diode electrically connected in series with said emitter to polarize the power through said transistor; and c. a second capacitor electrically connected to said base and parallel to said series collector and solenoid for charging said base toward the potential of said emitter for commutation of said transistor and thus interrupt the current flow through said solenoid after a duration of time.
Claim 12
Dependent Claim
52 words
The device according to claim 4 wherein said second switch means includes a third resistor electrically connected in parallel to said second capacitor to bleed off the charge on said second capacitor to terminate the commutation of said transistor upon interruption of electrical energy to said device and thus reset said transistor.
Claim 13
Dependent Claim
27 words
The device according to claim 5 wherein said second switch means includes a fourth resistor electrically connected between said base and said emitter for biasing said transistor.
Claim 14
Dependent Claim
31 words
The device according to claim 6 wherein said device includes indicator means electrically connected in parallel with said spare lamp for providing a visual indication when said spare lamp is illuminating.
Claim 15
Dependent Claim
81 words
The device according to claim 1 wherein said first switch means includes, a second thyristor operatively connected to said second circuit and having a second gate lead and a second pellet portion having a second common lead and a second high lead, said second gate lead electrically connected to said first high lead to maintain said second pellet portion electrically closed, when said first pellet portion is electrically open to afford illumination of said spare lamp and energization of said solenoid.
Claim 16
Dependent Claim
62 words
The device according to claim 8 wherein said first switch means includes impedance means electrically connected to said first high lead to minimize the current flowing through said first pellet portion and to maximize the phase shift of the current to lead the voltage through said second gate lead to afford similar illumination of said spare lamp relative to said maIn lamp.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |