The present invention relates to equipment for fine positioning of the cars of a multi-stage car for an elevator, wherein the car thresholds of the cars are positionable at the level of the floor thresholds.
An elevator with a double-deck car is shown in the Japanese patent document JP 2000296971, in which the upper car can be matched to the upper edge of the floor to be served and the lower car can be matched to the upper edge of the floor to be served. Deflecting rollers are arranged at the upper yoke of the main frame, which carries the cars, on each side and are drivable by means of a drive arranged at the upper yoke. A cable, which is connected at one end with the upper car and at the other end with the lower car, is guided over each deflecting roller, wherein the cars are moved in opposite sense to the positioning at the floor level.
A disadvantage of this known equipment resides in the fact that the cables are guided at each side over driven deflecting rollers. Due to slip or inaccuracies on the driven deflecting rollers, the car can tilt in the guides.
The present invention meets the object of avoiding the disadvantages of the known equipment and of creating a multi-stage car with cars able to be matched to the floors in terms of level, whereby safe boarding and departure for the elevator passengers is guaranteed.
The advantages achieved by the present invention are that with the multi-stage car according to the present invention the performance capability of the multi-stage elevator can be improved, because fine positioning of the stage or stages can be carried out in a shorter time. In addition, it is advantageous that a constant torque is required over the entire range of adjustment, wherein the range of adjustment is freely selectable by means of the cable length. Drive of the elevator cars is based on the principle of the differential block and tackle, which operates with a large translation, which together with the overall low friction losses creates the possibility of using a gearless drive for level matching of the cars. Moreover, the cars cannot tilt in the guides, because the selected cable guide cannot work against the car guides.
It is further of advantage that a proven and readily manageable technology can be used, which is distinguished by low friction losses, high rates of adjustment and rapid level matching, wherein matchings are possible during travel or at standstill. The elevator cars mutually form weight compensation, wherein in normal operation the forces do not extend beyond the side panels. A main frame is not absolutely necessary. An upper yoke, which is guided directly at the guide rails, is sufficient. Car frames are not necessary in the case of self-supporting elevator cars or open cars. Main yoke and cars can be guided directly at the guide rails.
The above, as well as other advantages of the present invention, will become readily apparent to those skilled in the art from the following detailed description of a preferred embodiment when considered in the light of the accompanying drawings in which:
A deflecting roller 25 arranged at the upper yoke 15 and with a radius R1 or diameter D1 is fixedly connected with a deflecting roller 26 with a radius R2 or a diameter D2. The deflecting rollers 25, 26 are drivable, for example, by means of a drive 27 arranged at the upper yoke 15, wherein a belt 28 acts on a belt pulley 29 connected with the deflecting rollers 25, 26 and generates a torque MA at a rotational speed n. The drive can be with or without gearing. Moreover, two deflecting rollers 30, 31 free-running independently of one another are arranged at the upper yoke 15.
At least one of the other deflecting rollers 20, 23, 30, 31 can also be drivable instead of the rollers 25, 26.
The deflecting rollers 20, 23, 25, 26, 30, 31 are connected by way of a support means, for example a cable 32 or several cables guided in parallel. A belt can also be provided instead of the cable. The cable 32 is endless and has the following course: deflecting roller 25—deflecting roller 30—deflecting rollers 20—deflecting roller 26—deflecting roller 31—deflecting rollers 23—deflecting roller 25. The cars 3, 4 execute vertical movements of opposite sense. For increase in traction, the support means 23 can be multiply looped on the rollers 25, 26, 30, 31.
The speeds “v”, the forces “F” and the moment MA can be mathematically calculated as follows:
vcable=(n·π·D1) or (n·π·D2) [1]
v1=(n·π·D1)−(n·π·D2) [2]
v2=(n·π·D2)−(n·π·D1) [3]
Δv=v1−v2=2·n·π·(D1−D2) [4]
F3=F1+F2+GFK+FAS [5]
ΔF=F1−F2 [6]
MA=(R1−R2)·ΔF·½ [7]
Wherein:
D1: diameter of deflecting roller 25
D2: diameter of deflecting roller 26
R1: radius of deflecting roller 25
R2: radius of deflecting roller 26
vcable: cable speed
v1: speed of lower car 3
v2: speed of upper car 4
F1: total weight force of the lower car 3
F2: total weight force of the upper car 4
F3: force in the cables 13 (total weight of the multi-stage car 2)
GFK: weight force of main frame 5
MA: torque necessary at the deflecting rollers 25, 26
n: rotational speed of the deflecting rollers 25, 26
FAS: force in the compensating cables 13.1
In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiment. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.
Number | Date | Country | Kind |
---|---|---|---|
04006288 | Mar 2004 | EP | regional |
Number | Name | Date | Kind |
---|---|---|---|
1896776 | James | Feb 1933 | A |
6161652 | Kostka et al. | Dec 2000 | A |
Number | Date | Country |
---|---|---|
1 357 075 | Oct 2003 | EP |
48 076242 | Oct 1973 | JP |
48076242 | Oct 1973 | JP |
2000296971 | Oct 2000 | JP |
WO0238342 | May 2002 | WO |
WO03086932 | Oct 2003 | WO |
WO2004087552 | Oct 2004 | WO |
Number | Date | Country | |
---|---|---|---|
20060163006 A1 | Jul 2006 | US |