US3575604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion control on doors of rapid transit cars
Assignee: SPX Technologies Inc
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Filing: 1969-09-17
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Granted: 1971-04-20
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Expires: 1989-09-17
Abstract
Abstract A vehicle door control system is provided for a rapid transit car. The door is actuated by a drive means in response to commands issued by a designating means. The motion of the vehicle is regulated by a power controller. The improved system includes vehicle function means for monitoring the various operational parameters of the vehicle and checking means responsive to the vehicle function means, the designating means and the power controller. The check means determines that the door of the car can be safely opened.
Inventors
- 👤 Joseph H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:02
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/40; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A vehicle door control system on a rapid transit car, the doors actuated by a drive means in response to commands provided by open and close designating means, and the car operatively controlled by a power controller wherein the improved door control system mounted on the car comprises: vehicle function means for monitoring operational parameters of the car; and check means governing said drive means for determining that the doors of the car can safely be opened including: first check means responsive to the car function means and the power controller; and second check means responsive to the car function means and the designating means, each producing enabling signals for conduction to the drive means under safe conditions.
Claim 2
Dependent Claim
118 words
A vehicle door control system on a rapid transit car, the doors actuated by a drive means in response to commands provided by open and close designating means, and the car operatively controlled by a power controller wherein the improved door control system mounted on the car comprises: vehicle function means for monitoring operational parameters of the car; and check means governing said drive means for determining that the doors of the car can safely be opened including: first check means responsive to the car function means and the power controller; and second check means responsive to the car function means and the designating means, each producing enabling signals for conduction to the drive means under safe conditions.
Claim 3
Dependent Claim
49 words
The control system of claim 1 wherein the car function monitoring means comprises: a brake pressure detector means for manifesting when the brakes of the car are applied to a predetermined pressure threshold; and a speed detector means for manifesting when the car achieves a predetermined range of speed.
Claim 4
Dependent Claim
44 words
The improved control system of claim 2 wherein the speed detector comprises: speed sensor means for producing signals proportional to the velocity of the car; and switching means responsive to the speed sensor signals activated when the car achieves a predetermined range of speed.
Claim 5
Dependent Claim
37 words
The vehicle door control system according to claim 2 wherein the checking means checks the operability of the brake pressure detector means and the speed detector means by maintaining a stick circuit energized of a check relay.
Claim 6
Dependent Claim
21 words
The vehicle door control system according to claim 4 wherein the checking means also checks the operability of the power controller.
Claim 7
Dependent Claim
46 words
The vehicle door control system according to claim 1 wherein means is provided for rendering operation of the doors to open positions only provided that the designating means is actuated after the car function means has determined that the car has substantially come to a stop.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |