Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Includes motor or motor driven linkage for shifting barrier
Reexamination Certificate
1998-04-17
2001-02-20
Olszewski, Robert P. (Department: 3652)
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Includes motor or motor driven linkage for shifting barrier
C187S309000
Reexamination Certificate
active
06189658
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a procedure for moving the landing door of an elevator and to a door coupler.
DESCRIPTION OF THE BACKGROUND ART
In elevators provided with automatic doors, the landing door is generally moved by the car door. The coupling between the car door and the landing door is implemented using a door coupler which is mounted on the car door and engages counterparts mounted on the landing door by means of its gripping elements. 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 are passed 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 also moves when the car door 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 a 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.
When an elevator car stops at a landing, usually the elevator car and the landing devices are not exactly aligned with each other, but either the location or position, or both, of the elevator car differs at least somewhat from the ideal location or position with respect to the equipment at the landing. For this reason, there are problems with the coupling between the car door and landing door, because inadequate ligament between the door coupler and the counterparts may lead to a host of various problems. If the door coupler is not properly aligned with the rollers on the landing door, this may result in noise, reliability problems, interruption of door operation, obstruction of emergency opening of the door, incomplete opening or closing movement of the door, etc.
SUMMARY OF THE INVENTION
In order to overcome the aforesaid problems relating to the opening and closing of elevator doors and the coupling between the car door and landing door, a procedure for moving the landing door of an elevator is presented as an invention. Furthermore, a new type of door coupler for an elevator door is presented as an invention.
The procedure of the invention comprises the steps of providing a door coupler attached to the car door; coupling the car door to the landing door with the door coupler when the elevator is stopped at a landing; engaging a counterpart mounted on the landing door with gripping elements provided on the door coupler during the step of coupling; aligning the door coupler according to a position of the counterpart by moving the door coupler in relation to the car door in a direction of car door movement; and preventing movement of the door coupler relative to the car door after the step of aligning. The door coupler of the invention comprises gripping elements for engaging a counterpart attached to a landing door when the elevator is stopped at a landing; a blocking device to prevent relative motion between the door coupler and the car door, the door coupler being movably mounted relative to a direction of car door movement.
The advantages provided by the invention include the following:
The invention ensures a reliable coupling between the car door and landing door and complete closing of the doors even if they are not exactly aligned with each other.
The drawbacks of inadequate or unsuccessful coupling, such as clatter and noise, interruption of door operation, the doors getting stuck, etc. are avoided.
The invention is applicable for use with both side-opening and center-opening automatic doors.
The door coupler can have a larger clearance, up to 2 or 3 times larger than in conventional door couplers, between the door coupler vanes and the rollers on the landing doors. A large clearance permits larger tolerances in the relative positions of the car and the elevator shaft, which in turn allows e.g. the use of a softer spring suspension of the elevator car. A large clearance could also permit a larger tolerance in the mounting of landing doors.
A flat door coupler structure is achieved. This makes it easy to place the door coupler between the car door and landing door. A space saving may be achieved.
The door coupler has a clear and simple structure, resulting in low manufacturing and installation costs and simple and easy maintenance.
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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