Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means
Reexamination Certificate
1999-04-01
2001-02-27
Salata, Jonathan (Department: 2837)
Elevator, industrial lift truck, or stationary lift for vehicle
With monitoring, signalling, and indicating means
Reexamination Certificate
active
06193019
ABSTRACT:
TECHNICAL FIELD
This invention concerns the area of detecting closing faults in elevator landing doors, and more particularly faults taking place in the landing door locks. It concerns more precisely a device which permits to localize without hesitation the defective lock in an elevator having suffered a breakdown, without the need to examine all the locks of the installation.
BACKGROUND OF THE INVENTION
It is known to ensure the safety of an elevator's operation by means of a safety chain. The latter includes an electric line fed by a power source, where all the landing door locks are installed in series the line. When all the locks are secured and in good operating condition, the safety chain is complete and a current passes through it. The chain governs a control device which powers the driving motor of the elevator cabin.
By contrast the safety chain is incomplete if even one of the locks is defective: the motor is not powered and the cabin remains in the stopped position. It is then necessary to intervene to repair the defect. If the latter is apparent it is easy to discover and repair it, but in the contrary case, for example when all the landing doors are properly closed and the cabin does not operate in spite of this, it is necessary to check all the landing doors individually, as well as all the locks. At best this work can be performed fairly easily and without much effort when the installation only has one or two floors, but in the case of a building with a large number of floors, the search of the defect is tedious, lengthy and costly.
DISCLOSURE OF THE INVENTION
The object of the present invention is to remedy this drawback by proposing a device which enables detecting a fault in the landing door locks of an elevator installation and automatically signaling the location of this fault in order to save the repair technician searching time.
According to the present invention, a device is provided for locating the defective closing of landing doors that are equipped with locks in an elevator installation of several floors, where said installation is equipped with an electrical safety chain connecting said locks in series; the device is characterized in that it comprises:
a number of electric impedances respectively mounted in parallel on said locks, where said impedances have specific values that differ from each other;
means for measuring the total impedance of the safety chain;
means for comparing said measured impedance with a cross reference table of floor impedance values, including all the previously determined values wherein the floor on which the breakdown occurred is the one where the measured impedance matches the impedance of the table;
and display means to indicate the floor or floors where the breakdown occurred.
Advantageously said impedances are made of pure resistances. The specific impedances are chosen as the powers of 2 and are provided by the formula:
R
i
=R
0
2
i
,
where R
0
is a predetermined constant resistance and i is a whole number between 0 and n that corresponds to the number of the floor.
REFERENCES:
patent: 3882969 (1975-05-01), Podcameni et al.
patent: 4750591 (1988-06-01), Coste et al.
patent: 5057699 (1991-10-01), Spence
patent: 5107964 (1992-04-01), Coste et al.
patent: 5780787 (1998-07-01), Kamani et al.
patent: 5787020 (1998-07-01), Molliere et al.
patent: 6070700 (2000-06-01), Nagel
patent: 0 149 727 A1 (1985-07-01), None
patent: 2 558 278 A1 (1985-07-01), None
Rebillard Pascal
Sirigu Gerard
Otis Elevator Company
Salata Jonathan
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