Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1987-05-20
1988-09-27
Rolla, Joseph J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187105, 187 19, 182142, B66B 1108
Patent
active
047735074
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a vibration damping mounting and safety arrangement for such lifts where the driving source is mounted on top of the lift cage.
In SE-A-8501335-7 there is disclosed a lift where the driving source of the lift is disposed on top of the lift cage and drives a pair of chain wheels, each wheel engaging a respective stationary roller chain extending between the top and bottom of the lift shaft. The engagement between the chain wheels and the chains is more than tangential and preferably extends along more than half the periphery of the chain wheels. In addition to other advantages achieved by this driving arrangement the lift obtains a very smooth and vibration-free motion, especially in comparison with other types of lifts which also have their driving source placed on top of the lift cage, as in the well-known rack and screw lifts, respectively. A similar lift is disclosed in FR-A5-1,406,277.
It is an object of the present invention to further improve the noise characteristics of lifts of the above and similar types by a particular mounting arrangement of the driving device, which mounting also permits the provision of a simple and reliable safety system to stop the lift in case of chain breakage or excessive chain slackening.
Thus, the invention relates to an arrangement for mounting a lift driving device to the top part of a lift cage in a lift of the type where the driving device comprises at least two horizontally spaced driving wheels, each of which engages a respective stationary elongate flexible member, such as a chain, extending vertically, characterized in that the driving device is supported by a separate mounting frame, from which the lift cage is functionally single point suspended substantially centrally between said driving wheels via first vibration damping support means to be at least slightly movable, said mounting frame being arranged to bear against the lift cage via second vibration damping support means on both sides of the point of suspension, which are at least slightly resilient, such that inclination of the mounting frame in relation to the lift cage is allowed, and further that sensor means are provided, e.g., between the mounting frame and the lift cage, which are designed to sense excessive biasing of the mounting frame and thereby cut off the power supply to the driving device.
The expression "functionally single point suspended" as used herein means any mounting arrangement whose function is equivalent to suspension from a single defined point. Thus, e.g., a suspension from several adjacent points may be functionally equivalent to a suspension from a single point.
Further, the term "lift" in the present context is to be understood in a broad sense and is thus intended to also comprise other types of lifting devices for vertical transport than what is normally understood by lifts or elevators for the transport of persons or goods. In the same way the term "lift cage" herein is to be understood in a broad sense as the load carrier of such lifting devices.
Hereinafter the invention will be described in more detail with respect to a particular embodiment, to which it, however, is not restricted in any way. Reference is made to the accompanying drawings, wherein
FIG. 1 is a schematic side-elevational view, partially in section, of a lift shaft with a lift of the type described in the introductory part;
FIG. 2 is a schematic top view of the lift device of FIG. 1;
FIG. 3 is a schematic partial front view of a mounting arrangement in accordance with the invention arranged in a lift of the type shown in FIGS. 1 and 2;
FIG. 4 is a schematic partial side-elevational view of the arrangement of FIG. 3, partially in section; and
FIG. 5 is a schematic partial top view of the arrangement of FIG. 3.
FIGS. 1 and 2 schematically show a lift of the type described in the above mentioned SE-A-8501335-7. It comprises in conventional manner a lift cage 1 arranged in a lift shaft 2. A drive motor 3, e.g. an electric motor, is attached to the top frame portion of the lift
REFERENCES:
patent: 651236 (1900-06-01), Corcoran
patent: 2573930 (1951-11-01), Radtke
patent: 3924710 (1975-12-01), Shohet
Inliftor AB
Pedersen Nils E.
Rolla Joseph J.
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