Lifting device with movable lifting columns

Details Lifting device with movable lifting columns Lifting device with movable lifting columns

1999-09-15

2001-11-13

Lillis, Eileen D. (Department: 3652)

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

C187S203000, C187S219000, C254S08900R, C414S427000, C414S458000

Reexamination Certificate

active

06315079

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a vehicle lift which comprises at least two separately displaceable lifting columns.
BACKGROUND OF THE INVENTION
Such a vehicle lift is known from AT-A-325,811 and is used particularly for lifting heavy vehicles, such as cars, trucks and buses.
The signals required to cause all lifting columns to operate as a unit are transmitted along separate connecting lines. These signals comprise activating signals for switching on and off the drive means of each lifting column and also monitoring signals for comparing the lifting height of each lifting column. The lifting columns are thus mutually coupled by the connecting lines to form one lifting device which functions in substantially the same manner as a customary vehicle lift.
SUMMARY OF THE INVENTION
The invention has for its object to further develop the known vehicle lift in order to give it more application options.
The lifting columns are hereby no longer considered as composite parts of a whole device but as separate devices which co-act in random numbers. With the invention is achieved that a wide diversity of control and monitoring signals can be exchanged between the separate lifting columns mutually and with the operating means, whereby the options for use of the lifting device according to the invention are greatly increased.
It is remarked here, that European patent application 0,747,535 relates to a lifting device with at least two lifting columns, where the connecting lines are a data base for exchange of control signals. However, this publication relates to transport of a building, where the lifting columns are necessarily displaceable, when a load is resting thereupon. Also, simultaneous actuation of the lifting columns is not an issue, but keeping the loads on each lifting column below a predetermined maximum is. Further, the structural requirements on a system for lifting and transporting a building, and the forces, which need to be generated in doing so, are considerably greater or higher than those in the case of a vehicle lift according to the present invention.
Communicating the safety signals via the data bus ensures that a random number of co-acting lifting columns can co-act reliably and, in particular, with great safety.
The CAN data bus and components therefor are well standardized, so that the control and operating means can be constructed and embodied in reliable manner. Because this data bus only requires two wires, the connecting lines remain well manageable and little vulnerable.
The proper operation of all lifting columns can be ascertained from the operating means whereby control signals for setting the safety means into operation can be transmitted in one direction in the closed circuit, which results in a high reliability.
User can select the lifting column which is most suitable for him for the operation of the whole device.
The energy supply for each, or at least a number of the lifting columns can take place via the at least one lifting column. It is possible for instance to dimension the supply voltage lines such that a total of four lifting columns are supplied via the one lifting column. The at least one lifting column can herein be provided with overload protection means which ensure switching off of the power supply in the case of overload of several or all coupled lifting columns.
According to another suitable embodiment the relative position of each lifting column is easily identifiable by the operating means.
The lifting columns which are disposed on either side of the same vehicle axle as pairs. It hereby becomes possible, when a vehicle is supported by more than four lifting columns, for instance to build in or remove an axle by independently operating the two lifting columns forming part of one pair.
Separate operation of the lifting columns mutually associated to form a pair can be performed in simple manner from the operating means.
After adjustment of one of the pairs, the other co-acting pairs can be identified simply by the operating means.


REFERENCES:
patent: 5800114 (1998-09-01), Secondi

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