MACHINE ROOM-LESS ELEVATOR APPARATUS

Abstract

 An elevator apparatus without a machine room capable of reducing an installation space and reducing cost is provided. In the elevator apparatus including an elevator car 4, a counter weight 5, a car guide rail 6, a counter weight guide rail 7, a rope 8 with which the car and the counter weight are suspended, and a traction machine 9 which is disposed at the hoistway top part 3, has a sheave 9a on which the rope 8 is wound and a motor 9b that drives the sheave, and raises and lowers the car and the counter weight, car return wheels 19 and 20 placed at the hoistway top part 3, a car suspension wheel 13 placed at a lower portion of the car 4, a counter weight return wheel 30 placed at the hoistway top part 3, and a counter weight suspension wheel 15 placed at the counter weight 5 are included, the rope 8 is connected at one end to an area in a vicinity of a central portion of the upper portion of the car, is wound on the traction machine sheave 9a via the car return wheels 19 and 20 and the car suspension wheel 13, is caused to hang via the counter weight suspension wheel 15 and the counter weight return wheel 30, and is connected at the other end to an area in a vicinity of a central portion of an upper portion of the counter weight 5.

Description

Technical Field

[0001] The present invention relates to a roping system of a large capacity elevator apparatus without a machine room with a large carrying load.

Background Art

[0002] Figure 6 is a plane view of a hoistway showing a conventional two to one roping elevator apparatus, and Figure 7 is an elevation view of the hoistway showing the conventional two to one roping elevator apparatus. In the drawings, reference numeral 1 denotes a hoistway, reference numeral 2 denotes a pit part of the hoistway, reference numeral 3 denotes a top part of the hoistway, reference numeral 4 denotes a car which ascends and descends in the hoistway 1, reference numeral 5 denotes a counter weight which ascends and descends in an opposite direction from the car 4 in the hoistway 1, reference numeral 6 denotes a guide rail for the car which restricts movement in the horizontal direction of the car 4, reference numeral 7 denotes a guide rail for the counter weight which restricts movement in the horizontal direction of the counter weight 5, reference numeral 8 denotes a rope with which the car 4 and the counter weight 5 are suspended, and reference numeral 9 denotes a thin traction machine which drives the car 4 and the counter weight 5 to cause them to ascend and descend via the rope 8. The traction machine 9 is constructed by a sheave 9a on which the rope 8 is wound, a motor 9b which drives the sheave and a reduction gear 9c, and is disposed at the wall side of the hoistway top part 3. Reference numeral 10 denotes a traction machine stand to which the traction machine 9 is fixed, reference numeral 11 denotes a hanger metal which hangs the traction machine stand 10, and reference numeral 12 denotes two support beams which hangs the hanger metal 11, and which are supported at the wall of the hoistway 1 or a built beam (not shown) to be horizontal and parallel with each other. Reference numeral 13 denotes two car suspension wheels disposed at both left and right end portions of the lower portion of the car 4, reference numeral 14 denotes a car suspension wheel support frame which is constructed integrally with the car 4 at the lower portion of the car 4 and supports the two car suspension wheels 13 on the left and right, reference numeral 15 denotes a counter weight suspension wheel which is placed at a center of an upper portion of the counter weight 5, reference numeral 16 denotes a counter weight side rope locking portion disposed at a part of the traction machine stand 10, reference numeral 17 denotes a car rope locking beam which is disposed to be close to and parallel with the wall of the hoistway 1 in the opposite direction from the traction machine 9, and reference numeral 18 denotes a car side rope locking portion which is placed at the car rope locking beam 17.

[0003] Next, an operation will be described. When the traction machine 9 is driven by actuation of the motor 9a, the sheave 9b rotates and the rope 8 is moved by traction. Movement of the rope 8 is transmitted to the two car suspension wheel 13 on the left and the right and the one central counter weight suspension wheel 15, and the car 4 and the counter weight 5 which are integrated with them respectively perform an ascending and a descending operations in the vertically reverse directions from each other at the speed which is a half the rope speed. Namely, the elevator apparatus without a machine room of two to one roping system is constructed.

[0004] 

Patent Document 1: International Publication WO01/042121

Patent Document 2: Japanese Patent Laid-Open No. 2000-153975

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] Since the conventional elevator apparatus without a machine room is constructed as above, the capacity of the traction machine becomes large and the size of the traction machine becomes large in a large capacity elevator with a large carrying load, with this, the members which support the traction machine become large, an installation space for housing them is required in the top part of the hoistway, and the area and the height of the top part of the hoistway are increased, as a result of which, there is the case where the top part of the hoistway is projected from the roof of a building, which impairs the beauty of the appearance of the building. There is also the problem of increasing the product cost and building cost due to increase in the traction machine and increase in the traction machine support members.

[0006] The present invention is made to solve the above described problems, and has an object to provide an elevator apparatus without a machine room which is capable of reducing an installation space and reducing building cost and product cost.

Means for Solving the Problems

[0007] The present invention provides an elevator apparatus without a machine room comprising a car which ascends and descends in a hoistway, a counter weight which ascends and descends in an opposite direction from the car, a guide rail for the car which restricts movement in a horizontal direction of the car, a guide rail for a counter weight which restricts movement in the horizontal direction of the counter weight, a rope with which the car and the counter weight are suspended, and a traction machine which is disposed at a top part of the hoistway, has a sheave on which the rope is wound and a motor that drives the sheave, and raises and lowers the car and the counter weight via the rope by rotating the sheave, characterized by comprising:

a car return wheel which is placed at the top part of the hoistway, a car suspension wheel placed at a lower portion of the car, a counter weight return wheel which is placed at the top part of the hoistway, and a counter weight suspension wheel which is placed at the counter weight, and characterized in that

said rope is connected at one end to an area in a vicinity of a central portion of an upper portion of the car, is wound on the traction machine sheave at the top part of the hoistway via a car return wheel at the top part of the hoistway and the car suspension wheel at the lower portion of the car, is further caused to hang via a counter weight suspension wheel, and the counter weight return wheel at the top part of the hoistway, and said rope is connected at the other end to an area in a vicinity of a central portion of an upper portion of the counter weight to construct a three to one roping system.

[0008]  Also, the car return wheel comprises a car side car return wheel disposed in a vicinity of a corresponding portion to a center of the car at the top part of the hoistway, and a hoistway wall side car return wheel which is disposed at the hoistway wall side of the top part of the hoistway, and is disposed so that a suspension position on a plane of the upper portion of the car by the car side car return wheel is at a position of the center of gravity at a time of carrying no load or at a time of carrying a maximum load.

[0009] Also, the car return wheel is fixed to a car return wheel support beam which is placed at a support beam which suspends a traction machine stand.

[0010] Also, the counter weight return wheel is fixed to a counter weight return wheel support beam which is placed at the support beam that suspends the traction machine stand.

[0011] Also, the car suspension wheel is disposed at each of two left and right spots which are at a lower portion of the car and on a horizontal line passing through a position of the center of gravity of the car.

[0012] Also, the present invention provides rotary shafts of the car suspension wheel and the car return wheel are disposed substantially parallel in a plane view.

[0013] Also, one counter weight suspension wheel is disposed at the upper portion of the counter weight.

[0014]  Also, a plurality of counter weight suspension wheels are disposed at the lower portion of the counter weight.

[0015] Moreover, a weighing device is placed at a car rope retaining portion to which the rope at the upper portion of the car is connected.

Effect of the Invention

[0016] According to the present invention, even in a large capacity elevator without a machine room with a large carrying load, it is possible to reduce an axial load exerted on a traction machine and torque to downsize the traction machine and to install the traction machine by reducing an installation space at a hoistway top part. Accordingly, the large capacity elevator without a machine room can be driven with a compact traction machine supported at a compact traction machine stand, and it is possible to reduce the building cost and reduce the cost of the apparatus by the reduced space of a downsized construction. It is also possible to provide an elevator apparatus capable of restraining inclination of the rope at the car upper portion and the counter weight upper portion by utilizing the traction machine height, without occurrence of strain in engagement of the rope and the return wheel, with excellent riding comfort, and capable of responding to the desires of the customers at low cost.

Brief Description of the Drawings

[0017] 

Figure 1 is a plane view of a hoistway showing an elevator apparatus in embodiment 1 of this invention;

Figure 2 is an elevation view of an upper part of the hoistway showing the elevator apparatus in the embodiment 1 of this invention;

Figure 3 is an enlarged view showing a weighing device provided at a car upper beam of the elevator apparatus in the embodiment 1 of this invention;

Figure 4 is an elevation view at a time of rise of a counter weight seen in the direction of the arrow A of Figure 2 showing an elevator apparatus in embodiment 2 of this invention;

Figure 5 is an elevation view at a time of rise of a counter weight seen in the direction of the arrow A of Figure 3 showing an elevator apparatus in embodiment 3 of this invention;

Figure 6 is a plane view of a hoistway showing a conventional two to one roping elevator apparatus; and

Figure 7 is an elevation view of the hoistway showing the conventional two to one roping elevator apparatus.

Description of Symbols

[0018] 

1

hoistway

2

pit part

3

hoistway top part

4

car

5

counter weight

6

car guide rail

7

counter weight guide rail

8

rope

9

traction machine

9a

sheave

9b

motor

9c

reduction gear

10

traction machine stand

11

hanger metal

12

support beam

13

car suspension wheel

14

car suspension wheel support frame

15

counter weight suspension wheel

16

counter weight side rope locking portion

17

car rope locking beam

18

car side rope locking portion

19

hoistway wall side car return wheel

20

car side car return wheel

21

car return wheel support beam

22

car upper beam

23

car rope retaining portion

24

car suspension spring

25

spring seat

26

nut

27

car side rope shackle

28

adjustment nut

29

weighing device

29a

weighing device detecting switch

29b

first lever

29c

second lever

29d

biasing spring

30

counter weight return wheel

31

counter weight return wheel support beam

32

counter weight suspension frame

33

counter weight rope retaining portion

34

counter weight suspension spring

35

counter weight side rope shackle

36

two counter weight suspension wheels

37

counter weight rope retaining portion

38

counter weight suspension wheel

39

counter weight rope retaining portion

Best Mode for Carrying Out the Invention

[0019] In order to describe this invention in more detail, an elevator apparatus without a machine room with a three to one roping system will be described as an example with reference to the drawings.

Embodiment 1

[0020] Figure 1 is a plane view of a hoistway showing an elevator apparatus in embodiment 1 of this invention, Figure 2 is an elevation view of an upper part of the hoistway showing the elevator apparatus in the embodiment 1 of this invention, and Figure 3 is an enlarged view showing a weighing device provided at a car upper beam of the elevator apparatus in the embodiment 1 of this invention. In the drawings, reference numeral 1 denotes a hoistway, reference numeral 2 denotes a pit part of the hoistway, reference numeral 3 denotes a top part of the hoistway, reference numeral 4 denotes a car which ascends and descends in the hoistway 1, reference numeral 5 denotes a counter weight which ascends and descends in an opposite direction from the car 4 in the hoistway 1, reference numeral 6 denotes a guide rail for the car which restricts movement in the horizontal direction of the car 4, reference numeral 7 denotes a guide rail for the counter weight which restricts movement in the horizontal direction of the counter weight 5, reference numeral 8 denotes a rope with which the car 4 and the counter weight 5 are suspended, and reference numeral 9 denotes a thin traction machine which drives the car 4 and the counter weight 5 to cause them to ascend and descend via the rope 8. The traction machine 9 is constructed by a sheave 9a on which the rope 8 is wound, a motor 9b which drives the sheave and a reduction gear 9c, and is disposed at the wall side of the hoistway top part 3. Reference numeral 10 denotes a traction machine stand to which the traction machine 9 is fixed, reference numeral 11 denotes a hanger metal which hangs the traction machine stand 10, and reference numeral 12 denotes two support beams with hang the hanger metal 11, and which are supported at the wall of the hoistway 1 or a built beam (not shown) to be horizontal and parallel with each other. Reference numeral 13 denotes two car suspension wheels disposed at both left and right end portions of the lower portion of the car 4, and is disposed on the horizontal line passing through the position of the center of gravity of the car 4. Reference numeral 14 denotes a car suspension wheel support frame which is constructed integrally with the car 4 at the lower portion of the car 4 and supports the two car suspension wheels 13 on the right and the left, reference numeral 15 denotes a counter weight suspension wheel which is placed at a center of an upper portion of the counter weight 5, reference numeral 19 denotes a hoistway wall side car return wheel which is disposed at the side of the hoistway wall of the hoistway top part 3, reference numeral 20 denotes a car side car return wheel which is disposed in the vicinity of the portion corresponding to a center of the car 4 in the hoistway top part 3, and both of these car return wheels 19 and 20 are disposed on a straight line in plane, and are disposed so that the car suspension position on a plane at the upper portion of the car 4 by the car side car return wheel 20 is at a position of substantially the center of gravity at the time of carrying no load or at the time of carrying the maximum load. Reference numeral 19a denotes a rotary shaft of the hoistway wall side car return wheel 19, reference numeral 20a denotes a rotary shaft of the car side car return wheel 20, and both of these rotary shafts 19a and 20a are disposed to be substantially parallel in the plane view with the rotary shafts of the above described two car suspension wheels 13 on the left and right. Reference 21 denotes a car return wheel support beam which is supported at both end portions by the two support beams 12 to bridge them, and supports both the above described car return wheels 19 and 20, reference numeral 22 denotes a car upper beam provided at the upper portion of the car 4, reference numeral 23 denotes a car rope retaining portion which is placed at a central portion of the car upper beam 22, reference numeral 24 denotes a car suspension spring which supports weight of the car 4, reference numeral 25 denotes a spring seat which retains the car suspension spring 24, reference numeral 26 denotes a nut which fastens the spring seat 25, and reference numeral 27 denotes a car side rope shackle which is connected to one end of the rope 8, is elastically connected to the car rope retaining portion 23 at the car upper beam 22 by the car suspension spring 24, and is placed with its inclination restrained to a specified value (vertical inclination of not more than 8.5 degrees) by utilizing the height dimension of the required traction machine. Reference numeral 28 denotes an adjustment nut attached to a lower end portion of the car side rope shackle 27, reference numeral 29 denotes a weighing device which is placed at a lower portion of the car upper beam 22 and detects a variation of the carrying load on the car 4 via the adjustment nut 28 of the car side rope shackle 27, reference numeral 29a denotes a weighing device detecting switch provided at the weighing device 29, reference numeral 29b denotes a first lever which is caused to abut to the adjustment nut 28 at the lower end portion of the car side rope shackle 27 and detects a variation of the carrying load added to the car side rope shackle 27, and reference numeral 29c denotes a second lever which is provided between the weighing device detecting switch 29a and the first lever 29b and transmits the movement of the first lever 29b to the detection switch 29a. Reference numeral 29d denotes a biasing spring which is provided between the second lever 29c and the weighing device 29 and always brings the first lever 29b into light contact with the adjustment nut 28. Reference numeral 30 denotes one counter weight return wheel which is placed at the upper corresponding position of the counter weight 5 in the hoistway top part 3, reference numeral 31 denotes a counter weight return wheel support beam which is supported between the two support beams 11 and supports the counter weight return wheel 30, reference numeral 32 denotes a counter weight suspension frame provided at an upper portion of the counter weight suspension wheel 15, reference numeral 33 denotes a counter weight rope retaining portion which is provided at a central part of the counter weight suspension frame 32, reference numeral 34 denotes a counter weight suspension spring, and reference numeral 35 denotes a counter weight side rope shackle which is connected to the other end of the rope 8 and is elastically supported at the counter weight rope retaining portion 33 via the counter weight suspension spring 34.
Namely, by the rope 8, the car 4 is suspended via the two car suspension wheels 13 on the left and right under the car, the two car return wheels 19 and 20 and the car rope retaining portion 23, the counter weight 5 is suspended via the one counter counter weight suspension wheel 15, the one counter weight return wheel 30 and the counter weight rope retaining portion 33, and the weighing device 29 which detects the variation of the carrying load on the car 4 by the deformation of the car suspension spring 24 of the car side rope shackle 27 is included.

[0021] Next, an operation will be described. When the traction machine 9 is operated, the rope 8 is moved by the traction. Movement of the rope 8 is transmitted to the car side rope retaining portion 23 and the counter weight side rope retaining portion 34 via the two car suspension wheels 13 on the left and right, the two car return wheels 19 and 20, the one counter weight suspension wheel 15 and the one counter weight return wheel 30 to raise and lower the car 4 and the counter weight 5 in the vertical opposite directions. Namely, a so-called three to one roping system which suspends both the car 4 and the counter weight 5 with three ropes is constructed.

Embodiment 2

[0022]  Figure 4 is an elevation view at a time of rise of a counter weight seen in the direction of the arrow A of Figure 2 showing an elevator apparatus in embodiment 2 of this invention. Reference numeral 36 denotes two counter weight suspension wheels placed at both left and right side portions of the upper portion of the counter weight 5, and reference numeral 37 denotes a counter weight rope retaining portion which is placed at a center of the upper portion of the counter weight 5.
Namely, at the other end side of the rope 8, the rope 8 is laid on the counter weight rope retaining portion 37 at the center of the upper portion of the counter weight 5 from the sheave 9a of the traction machine 9 through the two left and right counter weight suspension wheels 36 at the upper portion of the counter weight 5, and the one counter weight return wheel 30 at the hoistway top part 3 to hang the counter weight 5. Thereby, a three to one roping system as in the above described embodiment 1 is constructed.

Embodiment 3

[0023] Figure 5 is an elevation view at a time of rise of a counter weight seen in the direction of the arrow A of Figure 2 showing an elevator apparatus in embodiment 3 of this invention. Reference numeral 38 denotes two counter weight suspension wheels placed at both left and right side portions of the lower portion of the counter weight 5, and reference numeral 39 denotes a counter weight rope retaining portion which is placed at a center of the upper portion of the counter weight 5.
Namely, at the other end side of the rope 8, the rope 8 is laid on the counter weight rope retaining portion 39 at the center of the upper portion of the counter weight 5 from the sheave 9a of the traction machine 9 through the two left and right counter weight suspension wheels 39 at the lower portion of the counter weight 5, and the one counter weight return wheel 30 at the hoistway top part 3 to hang the counter weight 5. Thereby, a three to one roping system as in the above described embodiment 1 is constructed.

Industrial Applicability

[0024] As described above, the present invention is preferable for use in a roping system of a large capacity elevator apparatus without a machine room with a large carrying load.

Claims

1. An elevator apparatus without a machine room comprising a car which ascends and descends in a hoistway, a counter weight which ascends and descends in an opposite direction from the car, a guide rail for the car which restricts movement in a horizontal direction of the car, a guide rail for a counter weight which restricts movement in the horizontal direction of the counter weight, a rope with which the car and the counter weight are suspended, and a traction machine which is disposed at a top part of the hoistway, has a sheave on which the rope is wound and a motor that drives the sheave, and raises and lowers the car and the counter weight via the rope by rotating the sheave, characterized by comprising:

a car return wheel which is placed at the top part of the hoistway, a car suspension wheel placed at a lower portion of the car, a counter weight return wheel which is placed at the top part of the hoistway, and a counter weight suspension wheel which is placed at the counter weight, and characterized in that

said rope is connected at one end to an area in a vicinity of a central portion of an upper portion of the car, is wound on the traction machine sheave at the top part of the hoistway via a car return wheel at the top part of the hoistway and the car suspension wheel at the lower portion of the car, is further caused to hang via a counter weight suspension wheel, and the counter weight return wheel at the top part of the hoistway, and said rope is connected at the other end to an area in a vicinity of a central portion of an upper portion of the counter weight to construct a three to one roping system.

2. The elevator apparatus without a machine room according to claim 1, characterized in that
the car return wheel comprises a car side car return wheel disposed in a vicinity of a corresponding portion to a center of the car at the top part of the hoistway, and a hoistway wall side car return wheel which is disposed at the hoistway wall side of the top part of the hoistway, and is disposed so that a suspension position on a plane of the upper portion of the car by the car side car return wheel is at a position of the center of gravity at a time of carrying no load or at a time of carrying a maximum load.

3. The elevator apparatus without a machine room according to claim 2, characterized in that
the car return wheel is fixed to a car return wheel support beam which is placed at a support beam which suspends a traction machine stand.

4. The elevator apparatus without a machine room according to claim 3, characterized in that
the counter weight return wheel is fixed to a counter weight return wheel support beam which is placed at the support beam that suspends the traction machine stand.

5. The elevator apparatus without a machine room according to claim 2, characterized in that
the car suspension wheel is disposed at each of two left and right spots which are at a lower portion of the car and on a horizontal line passing through a position of the center of gravity of the car.

6. The elevator apparatus without a machine room according to any one of claims 2 to 5, characterized in that
rotary shafts of the car suspension wheel and the car return wheel are disposed substantially parallel in a plane view.

7. The elevator apparatus without a machine room according to claim 6, characterized in that
one counter weight suspension wheel is disposed at the upper portion of the counter weight.

8. The elevator apparatus without a machine room according to claim 6, characterized in that
a plurality of counter weight suspension wheels are disposed at the lower portion of the counter weight.

9. The elevator apparatus without a machine room according to claim 6, characterized in that
a weighing device is placed at a car rope retaining portion to which the rope at the upper portion of the car is connected.

Drawing