US3882969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety system for controlling the start-up of elevators
Assignee: Individual
•
Filing: 1973-06-14
•
Granted: 1975-05-13
•
Expires: 1993-06-14
Abstract
Abstract A safety system for controlling the start-up of elevators is described for the prevention of the fatal accidents which have recently been occurring due to the lack of care by the personnel responsible and the like who start up the cabin without knowing what is happening inside or even outside it. This has caused death by crushing of dozens of people who are alarmed and try to enter or leave exactly when the cabin begins to move. The system of the present invention does not permit such accidents by not allowing the cabin to move when any door is open, be it the door of the cabin itself or of the floor at which it is stopped.
Inventors
- 👤 Abelardo Podcameni
- 👤 Aldo Alves Goncalves
- 👤 Sebastiao Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:28
CPC Classifications
B; B66; B66B; B66B13/00; B66B13/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
In an elevator system including a vertical shaft extending through a plurality of building floors and having a shaft opening at each floor to permit passenger access, door means at each floor for closing the respective shaft openings, an elevator cab suspended in the shaft for bidirectional vertical movement therein, control means, and drive motor/brake means for moving the cab in response to the control means, an improved safety circuit comprising: a. a plurality of electro-mechanical lock means individually and operatively associated with each door means, b. means for supplying an electrical signal to each of the lock means, the same signal being supplied to each of the lock means and said signal having substantially constant identifying characteristics, c. a plurality of signal modification means individually included in each lock means for modifying at least one of the signal identifying characteristics in response to the closure of the associated door means, and d. means for detecting the modification of all of the electrical signals and for enabling the operation of the drive motor/brake means in response thereto.
Claim 2
Dependent Claim
177 words
In an elevator system including a vertical shaft extending through a plurality of building floors and having a shaft opening at each floor to permit passenger access, door means at each floor for closing the respective shaft openings, an elevator cab suspended in the shaft for bidirectional vertical movement therein, control means, and drive motor/brake means for moving the cab in response to the control means, an improved safety circuit comprising: a. a plurality of electro-mechanical lock means individually and operatively associated with each door means, b. means for supplying an electrical signal to each of the lock means, the same signal being supplied to each of the lock means and said signal having substantially constant identifying characteristics, c. a plurality of signal modification means individually included in each lock means for modifying at least one of the signal identifying characteristics in response to the closure of the associated door means, and d. means for detecting the modification of all of the electrical signals and for enabling the operation of the drive motor/brake means in response thereto.
Claim 3
Dependent Claim
37 words
A safety circuit as defined in claim 1 wherein the means for detecting comprises a plurality of discriminators individually coupled to the signal modification means, and an AND circuit having its inputs coupled to the discriminator outputs.
Claim 4
Dependent Claim
42 words
A safety circuit as described in claim 2 wherein the means for enabling cOmprises a switch connected in series in the circuit of the drive motor/brake means and operable to complete said circuit in response to an output from the AND circuit.
Claim 5
Dependent Claim
20 words
A safety circuit as described in claim 3 wherein the electrical signal is also supplied to each of the discriminators.
Claim 6
Dependent Claim
43 words
A safety circuit as described in claim 3 wherein the means for supplying an electrical signal, the discriminators, the AND circuit, and the switch are all mounted and contained within a secure metallic housing located in an engine room of the elevator system.
Claim 7
Dependent Claim
66 words
A safety circuit as described in claim 3 further comprising a first indicator panel having a plurality of lights individually connected to the discriminators for indicating when an associated door means is opened, and a second indicator panel having two lights connected to the AND circuit for indicating when any one of the door means is opened and when all of the door means are closed.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |