Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Including barrier mounted at landing
Reexamination Certificate
1998-08-28
2001-01-16
Olszewski, Robert P. (Department: 3652)
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Including barrier mounted at landing
C187S309000, C187S319000, C049S120000
Reexamination Certificate
active
06173815
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a door -coupler and to a locking device for a car door of an elevator.
DESCRIPTION OF THE BACKGROUND ART
In elevators provided with automatic doors, the coupling between the car door and the landing door is generally implemented using a door coupler which is mounted on the car door and which, by means of its gripping elements, engages counterparts mounted on the landing door. The door coupler and the counterparts are so fitted relative to each other that, when the elevator car is moving past the landing door, the counterparts on the landing door pass between the gripping elements of the door coupler. When the car is at a landing and the car doors are moving, the door coupler is in engagement with the counterparts. In this way, the landing door moves together with the car door when the latter is moved by a power means connected to the car door. Often the gripping elements are metal vanes projecting from the door coupler towards the landing door and forming a kind of vertical slot which is open towards the landing door. The counterparts used often consist of rollers mounted on the landing door and projecting from the door towards the elevator shaft, the axle of the rollers being mounted in a position perpendicular to the plane of the door. In conjunction with the door coupler or the car door itself there is a locking device which closes the car door so that it cannot, at least without special measures, be opened except when the elevator car is near a landing, i.e. when the elevator car is within the so-called door zone. The locking system of an elevator door must be reliable and durable. The locking of an elevator door should not produce any disturbing noise.
There are various arrangements for locking the elevator door in a manner that is reliable and suited for use with an elevator door. For instance, a locking system operated by a separate electromechanical actuator requires that the elevator has a separate subsystem or a parallel system for the control of door operation that takes care of locking and unlocking the door. A locking system using a separate electromechanical actuator always involves an additional cost corresponding to the price of the actuator.
There are also mechanical locking systems in which the actuating force for locking the door is taken from the motion of the elevator car or the car door. In such systems the landing zone is indicated and/or the operation of the lock is controlled by means of a separate slide or other sign provided in the elevator shaft at each landing and immovably fixed in place with respect to the elevator shaft. Mounting such slides or signs in the elevator shaft at each landing requires plenty of installation time. A long installation time means high labor costs.
Often the locking arrangement occupies a large space and therefore the placement of the locking devices more or less dictates the design of the door or door suspension of the elevator car.
SUMMARY OF THE INVENTION
To meet the need to achieve a simple, mechanically operated locking device for the door of an elevator car which is applicable for use in a modern elevator environment and in modern elevator technology and is cheap to manufacture and advantageous in respect of space utilization, easy to install, noiseless in operation and is integrated with the door coupler, a new type of door coupler and a new type of locking system are presented as an invention.
The advantages achieved by the invention include the following:
the locking device is cheap to manufacture.
being integrated with the door coupler, the locking device permits the application of a simpler door concept. Integrating the door coupler with the locking system simplifies the installation.
since the locking is controlled by the operation of the door coupler, in other words, by the presence or absence of a counterpart attached to a landing door within the reach of a gripping element of the door coupler, the elevator shaft need not be provided with separate control devices or signs to indicate door zones.
the locking device is of a construction that does not take up much space, so it is not difficult to accommodate it even in thin structures.
the locking device is easy to install in conjunction with the door and, being mechanically controlled, requires no electric actuating equipment.
the door remains locked when outside landing zones, the locking is not affected by possible disturbances in the electrical system of the elevator.
if in the event of a power failure the elevator has stopped between floors, the door can be opened after the elevator has been moved manually to a landing.
the equipment does not produce any extra noise when the elevator is running or when the car door is being locked or unlocked.
the locking and unlocking of the car door of the elevator is dependent on the opening and closing of the door both mechanically and in respect of time.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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Birch & Stewart Kolasch & Birch, LLP
Kone Corporation
Olszewski Robert P.
Tran Thuy V.
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