FR2791048A1 - Mechanism for drum-type lift has three suspension pulleys and hoist placed within horizontal projection surface of lift-car - Google Patents

Abstract

First cable (18) has one end attached to drum (15a) of hoist (15), goes around first (11) and third (13) suspension pulleys, and has other end attached to lower end of lift-car (4). Second cable (19) has one end attached to drum of hoist, goes around second (12), third, and first suspension pulleys, and has other end attached to lower end of lift-car. Three suspension pulleys and hoist are therefore placed within horizontal projection surface of lift-car.

Description

1i 2791048

  DRUM TYPE ELEVATOR SYSTEM

TECHNICAL AREA

  The present invention relates to an elevator system which makes it possible to obtain a compact cage thanks to a new device for

  cab suspension by cables.

BACKGROUND

  Firstly, with reference to FIGS. 5 and 6, an example of a prior art drum elevator will be described. As shown in Figure 5, the elevator comprises an elevator car 102 arranged in a cage 101 to move freely in the vertical direction and a pair of suspension pulleys 103 and 104 mounted on top of the cage 101. A winch 105 of the drum type is provided at the lower part of the cage 101 and a first cable 106, one end of which is fixed to the drum 105a is passed over the first suspension pulley 103 and over the second suspension pulley 104 and its other end is fixed to the elevator car 102. In addition, a second cable 107, one end of which is fixed to the drum 105a, is passed over the first suspension pulley 103 and its other end is fixed to the elevator car 102. The elevator car 102 is set in motion in the vertical direction by the winding and

  unwinding of the cables 106, 107 by the drum 105a.

  In this type of conventional cable suspension, since the second cable 107 has one end fixed to the elevator car 102 and the other end fixed to the drum 105a after the cable has been passed over the first suspension pulley 103 , the suspension pulley 103 and the winch 105 project outside the horizontal projection surface 108 of the elevator car, as shown in FIG. 6. Consequently, the problem arises that the cage elevator 101 is bulky in its projection surface

  horizontal and that it does not meet the condition of compactness.

SUMMARY OF THE INVENTION

  The present invention aims to make the elevator shaft

  compact in its horizontal projection surface.

  To achieve this object, the elevator according to the present invention comprises a first suspension pulley and a second suspension pulley mounted on one side of the cage, a third pulley of

2 2791048

  suspension mounted on the other side of the cage, an elevator car arranged to be able to move vertically in the cage, a drum type winch located on one side of the cage, a first cable, one end of which is fixed to the drum winch and which is then passed successively over the first suspension pulley and over the third suspension pulley and the other end of which is fixed to the other end side of the elevator car, and a second cable of which one end is fixed to the drum and which is then passed successively over the first suspension pulley, over the third suspension pulley, then over the second suspension pulley, and the other end of which is fixed to one end side of the elevator car, the assembly being arranged so that the first suspension pulley, the second suspension pulley, the third suspension pulley and the drum winch project roughly the

  horizontal projection surface of the elevator car.

DESCRIPTION OF THE FIGURES

  An embodiment of the invention will now be described with reference to the accompanying drawings in which: FIG. 1 is a schematic perspective view showing an embodiment of an elevator of the drum type according to the present invention; Figure 2 is a figure showing the cable suspension of the elevator car; Figure 3 is a top view of the elevator shaft; Figure 4 is a perspective view of the drum elevator; Figure 5 is a schematic perspective view of a prior art drum elevator; Figure 6 is a top view of an elevator shaft of the

prior art.

DETAILED DESCRIPTION

  The invention will be explained in detail with reference to the figures. Figures 1 to 5 show an embodiment of an elevator of the

  drum type according to the present invention.

  In Figure 4, steel uprights 1 and 2 stand on a base 3 arranged at the base of the elevator shaft. The steel uprights 1 and 2 have a U-shaped section and serve as guide rails for guiding the elevator car 4. The elevator car 4 has a

3 2791048

  door 5 and a control panel 6 provided at the top of the elevator car 4 to control the opening and closing of

door 5.

  Two support brackets 7 and 8, of roughly triangular shape, are fixed to the top of the guide rails 1 and 2 and support crosspieces 9 and 10 arranged in parallel; a first suspension pulley 11 and a second suspension pulley 12, supported in rotation by the crosspieces, are positioned on one side of the cage, and a third suspension pulley 13, also supported in rotation by the crosspieces, is positioned on the on the other side of the cage. In addition, a passenger entry door 14 is attached to the

guide rails 1 and 2.

  A winch 15 of the drum type, which sets the elevator car 4 in vertical direction, is mounted on one side at the bottom of the cage, and a control panel 16, which controls the operation

  of the elevator car 4, is fixed on the other side.

  As shown in Figure 1, a first cable 18 has one end which is fixed to the drum 15_a of the drum winch 15 which is on a first side of the cage 17; this first cable 18 is passed successively over the first suspension pulley 11 and over the third suspension pulley 13, and its other end is fixed to the lower part of the elevator car 4. In addition, a second cable 19 has a end which is fixed to the drum 15_a; this second cable 19 is passed over the second suspension pulley 12, then over the third suspension pulley 13 and over the first suspension pulley 11, and its other end is fixed to the lower part

  of the elevator car 4, as shown in Figure 2.

  Thanks to this type of cable suspension, it is possible to position not only the third suspension pulley 13, but also the first suspension pulley 11, the second suspension pulley 12 and the drum winch 15 approximately within the limits. of the horizontal projection surface 20 of the elevator car, as

shown in figure 3.

  As just explained, according to the present invention, the first suspension pulley, the second suspension pulley, the third suspension pulley and the drum type winch are positioned approximately within the limits of the projection surface.

4 2791048

  horizontal of the elevator car, so that the elevator shaft

  can be made compact in its horizontal projection surface.

2791048

Claims (2)

  1. Elevator system of the type comprising an elevator shaft (17), an elevator car (4) and a drum winch (15), characterized in that: the drum winch (15) is placed on a first side of the elevator shaft (17) and in that it comprises: a first cable (18) having one end fixed to the winch (15), said cable passing successively over a first suspension pulley (11) placed at the top of the first side of the elevator shaft (17) and on a third suspension pulley placed at the top of the opposite side of the elevator shaft, the other end of the first cable being fixed to the elevator car ( 4) on a side adjacent to the second side of the elevator shaft, and a second cable (19) having one end fixed to the winch (15), said cable passing successively over the first suspension pulley (11), then over the third suspension pulley (13), then on a second suspension pulley (12), placed at the top of the first side of the elevator shaft (17), the other end of this second cable (19) being fixed to the elevator car (4), on another   side adjacent to the first side of the elevator shaft (17).   2. The system of claim 1, further characterized in that the first suspension pulley (11), the second suspension pulley (12), the third suspension pulley (13) and the drum winch (15) are positioned within the limits of the area of   horizontal projection (20) of the elevator car (4).