Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1998-05-26
2000-05-16
Olszewski, Robert P.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187330, 187319, 187333, B66B 1312
Patent
active
060623454
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an elevator interlocking mechanism, comprising a lift cage door having interlocking of the lift cage door, and a landing door at each landing having interlocking of the landing door, said doors being interlocked, when the lift cage is moving, the interlocking of the lift cage door and the interlocking of a landing door may be released when the lift cage is at rest at the respective landing of said landing door.
Prior art lifts have been provided with various locking mechanisms for preventing the lift cage door or the landing doors from being opened, when the lift cage is in motion or beyond a landing. These prior solutions of the above problems have always comprised a more or less complex separate interlocking mechanism for the lift cage door and a separate interlocking mechanism for each landing, said interlocking mechanisms being independently operated. In general various, fix cams, provided at each landing, have been used, which act on movable cam roll, associated with the lift or vice versa, by means of which the interlockings of the doors are released, so that the doors could be opened.
The disadvantages of prior art are that it requires a great precision in the manufacture and mounting of the various components involved. Furthermore, the number of members of the prior mechanisms is rather big, resulting in quite a high cost of assembly for these parts. Further, the big number of precisionmade members implies that the locking mechanisms will become relatively sensitive to wear and dirt, leading to a non neglectable cost of maintenance.
The object of the invention is to provide an interlocking mechanism of the kind indicated above and in the preamble of claim 1, which avoids those above discussed disadvantages, includes a significantly less total number of components than other mechanisms for this purpose, is wear resistant, and may be produced at a lower cost than before.
This object is solved according to the invention in a mechanism of the kind defined in the preamble of claim 1, which comprises the features, defined in the characterizing part of claim 1.
By these measures only one operating mechanism need be provided in the lift cage for operating the interlocking of the lift cage and all interlockings of the landings (of course, not all simultaneously). Thus, the number of members involved may significantly be reduced in relation to prior solutions.
Further, the reduced requirements of accuracy in the positioning of the cams result in a quicker and simplified installation of the complete elevator system and in less costs as a consequence.
It should be noted that "door" in this connection includes all types of doors, that can be interlocked in a lift cage and at landings, single and double side hung doors, as well as vertical and horizontal push doors.
Hereinafter a preferred embodiment of the invention will be explained more in detail. It should be noted that for the sake of clarity only those details, which are necessary for the understanding of the principles of invention, are explained and illustated in the drawings. In addition to this, the components involved are only schematically shown, thus, the drawings are not machine drawings.
FIG. 1 is a top view of the lift interlocking mechanism of the invention, mounted on a lift cage and at landings, respectively, several members being removed from these elements,
FIG. 2 is a side view, seen from line II--II in FIG. 1, of the components disposed on the lift roof, and
FIG. 3 is a side view, seen from line III--III in FIG. 1, of the components provided at a landing for interlocking and for release of the interlocking of landing door provided at this landing.
Principally, the interlocking mechanism of the invention comprises two main parts, one of which is attached to the lift cage 1, of which only a limited portion is shown, the other of which is fixed at a landing.
The lift cage part consists of a linear actuator 2, fixed to the lift cage by means of fittings 6. The actuator 2 comprises a cylinder and a piston rod 4, linearl
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Alimak AB
Olszewski Robert P.
Tran Thuy V.
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