JP7555502B2 - Counterweights and elevators - Google Patents

Description

The present invention relates to a counterweight and an elevator equipped with the counterweight.

In a bucket elevator, a rope connects the car and the counterweight, balancing the mass of the two. This reduces the load on the hoist around which the rope is wound. In elevators with a large car mass, the mass of the counterweight must necessarily be large.

To increase the mass of the counterweight, it is possible to use a counterweight with a higher specific gravity, or to make the counterweight larger and increase the number of counterweights loaded. However, counterweights with a higher specific gravity are expensive, so using a counterweight with a higher specific gravity increases the cost of the counterweight.

Patent Document 1 discloses an elevator counterweight frame structure having a vertical frame, an upper plate installed on the top of the vertical frame, and a lower plate installed on the bottom of the vertical frame. This elevator counterweight frame structure forms a first storage section between a pair of first vertical frames, and forms a second storage section between a pair of second vertical frames. Weights are loaded in the first storage section and the second storage section.

JP 2009-215034 A

However, the elevator counterweight frame structure disclosed in Patent Document 1 is not equipped with an emergency stop device. An emergency stop device is generally provided on the lower part of the frame of the counterweight. Therefore, if an emergency stop device is provided, it is difficult to load a weight on the lower part of the frame.

Taking into consideration the above problems, the objective of this invention is to provide a counterweight that can secure space for loading a weight under the frame even when an emergency stop device is installed, and an elevator equipped with this counterweight.

In order to solve the above problems and achieve the present object, the counterweight of the present invention includes a frame body that moves while being guided by a guide rail provided in a hoistway, a plurality of first weights arranged within the frame body, a braking mechanism, a lifting mechanism, and a lifting mechanism mounting member. The braking mechanism has a brake that is connected to the frame body and is pulled up to clamp the guide rail and stop the movement of the frame body. The lifting mechanism lifts the brake. The lifting mechanism mounting member mounts the lifting mechanism to the frame body and holds the second weight.
In addition, the elevator of the present invention drives the car and the counterweight connected by a rope to ascend and descend in different directions.

With the counterbalancing weight of the above configuration, even when an emergency stop device (braking mechanism and lifting mechanism) is installed, space can be secured at the bottom of the frame to load the weight.

FIG. 1 is a schematic configuration diagram showing an elevator according to one embodiment. FIG. 1 is a front view of a counterweight according to one embodiment. FIG. 1 is a side view of a counterweight according to one embodiment. FIG. 13 is an enlarged view of a damping mechanism for a counterweight according to one embodiment. FIG. 13 is a front view of a lifting mechanism for a counterweight in accordance with one embodiment. FIG. 13 is a side view of a lifting mechanism for a counterweight in accordance with one embodiment. FIG. 13 is an enlarged view of a lifting mechanism mounting member of a counterweight in accordance with one embodiment. FIG. 13 is a side view of a buffer mount attachment member of a counterweight in accordance with one embodiment.

1. Embodiment A counterweight and elevator according to one embodiment will be described below with reference to Figures 1 to 8. Note that the same reference numerals are used to designate common members in each figure.

[Elevator configuration]
First, the configuration of an elevator according to one embodiment will be described with reference to FIG.
FIG. 1 is a schematic diagram illustrating an example of the configuration of an elevator according to one embodiment.

As shown in Figure 1, elevator 1 is a so-called machine room-less elevator that does not have a machine room above the hoistway 100 formed in a building structure. Note that the elevator of the present invention is not limited to a machine room-less elevator, and may be an elevator that has a machine room above the hoistway 100.

The elevator 1 has a car 110 that rises and falls within the elevator shaft 100, a hoist 120, a counterweight 130, a first driven pulley 140, a second driven pulley 150, and a rope 170.

A lifting pulley 111 is provided at the bottom of the car 110. A rope 170 is wound around the lifting pulley 111. A counterweight side pulley 33 is provided at the top of the counterweight 130. A rope 170 is wound around the counterweight side pulley 33.

The hoisting machine 120 is disposed at the bottom of the elevator shaft 100. A rope 170 is wound around the hoisting machine 120. The hoisting machine 120 raises and lowers the car 110 and the counterweight 130 in a bucket-like manner via the rope 170. The drive of the hoisting machine 120 is controlled by a control unit (not shown).

The first driven pulley 140 and the second driven pulley 150 are rotatably attached to the top of the elevator shaft 100. One end and the other end of the rope 170 are fixed to the top of the elevator shaft 100. The rope 170 is wound from the counterweight side pulley 33 provided on the counterweight 130 to the first driven pulley 140, and is then wound around the hoist 120, the second driven pulley 150, and the lifting pulley 111 of the car 110 in that order.

When the hoist 120 is driven, the car 110 and the counterweight 130 move up and down within the elevator shaft 100. Hereinafter, the direction in which the car 110 and the counterweight 130 move up and down is referred to as the up and down direction.

[Balance weight configuration]
Next, the configuration of the counterweight 130 will be described with reference to FIGS.
2 is a front view of the counterweight 130. FIG 3 is a side view of the counterweight 130.

As shown in Figures 2 and 3, the balancing weight 130 comprises a frame body 31, a plurality of weight pieces 32 mounted on the frame body 31, a weight side pulley 33, an emergency stop device 34, and a buffer stand 35.

The frame body 31 includes a pair of vertical frames 41A, 41B and a pair of upper frames 42 that connect the upper parts of the pair of vertical frames 41A, 41B. The vertical frames 41A, 41B are members that extend in the up-down direction. The vertical frames 41A, 41B are bent so that the cross section parallel to the horizontal direction is approximately C-shaped.

The vertical frames 41A and 41B have a front surface, a back surface facing the front surface, and side surfaces connected to the front surface and the back surface. Hereinafter, the direction in which the front surface and the back surface of the vertical frames 41A and 41B face each other is referred to as the thickness direction of the frame body 31. In addition, the direction in which the side surfaces of the pair of vertical frames 41A and 41B face each other is referred to as the width direction of the frame body 31.

The upper frame 42 is made of a roughly T-shaped plate. The upper frame 42 is disposed on the upper part of the pair of vertical frames 41A, 41B with the narrower part facing upward. The two ends of the wider part of the upper frame 42 are attached to the front (or rear) of the pair of vertical frames 41A, 41B with bolts. The pair of upper frames 42 rotatably support the weight side pulley 33.

An upper guide shoe 43 is fixed to each of the side surfaces at the upper part of the pair of vertical frames 41A, 41B. The upper guide shoe 43 slidably engages with a guide rail 131 provided in the elevator shaft 100 (see FIG. 1). In other words, the frame body 31 is guided by the guide rail 131 to rise and fall.

In addition, a support 45 is attached to the middle of the pair of vertical frames 41A, 41B. This increases the rigidity of the frame body 31. Furthermore, a number of weight holders (not shown) are connected to the inside of the pair of vertical frames 41A, 41B. The multiple weight holders hold the first weight piece 32A of the multiple weight pieces 32.

The emergency stop device 34 has two braking mechanisms 51A, 51B and a lifting mechanism 52 arranged above the two braking mechanisms 51A, 51B. The two braking mechanisms 51A, 51B are attached to the lower ends of the pair of vertical frames 41A, 41B with bolts. The two braking mechanisms 51A, 51B have the same configuration. The lifting mechanism 52 is attached to the pair of vertical frames 41A, 41B using a lifting mechanism mounting member 53.

The buffer table 35 is disposed between the two braking mechanisms 51A, 51B. The lower end of the buffer table 35 is located lower than the two braking mechanisms 51A, 51B. The buffer table 35 is fixed to a pair of vertical frames 41A, 41B using a buffer table mounting member 54. The buffer table 35 faces a buffer device installed at the bottom of the elevator shaft 100. When the counterweight 130 descends below a predetermined position, the buffer table 35 comes into contact with the buffer device to absorb the impact.

[Configuration of braking mechanism]
Next, the configuration of the braking mechanisms 51A and 51B will be described with reference to FIG.
FIG. 4 is an enlarged view of the brake mechanism 51A.

Brake mechanisms 51A and 51B have the same configuration. Therefore, only brake mechanism 51A will be described here. As shown in FIG. 4, brake mechanism 51A has a housing 61, a pair of brakes 62A and 62B, a pair of guide members 63A and 63B, a biasing member 64, a support member 65, and a lifting rod 66.

The housing 61 is formed in a box shape with a storage chamber 61a that opens to the side. The storage chamber 61a opens to the top and bottom of the housing 61. A guide rail 131 passes through the storage chamber 61a. The top of the housing 61 is attached to the bottom end of the vertical frame 41A with bolts.

A lower guide shoe 44 is fixed to the underside of the housing 61 (see FIG. 2). The lower guide shoes 44 face each other in the vertical direction, sandwiching the housing 61 therebetween. The lower guide shoes 44 slidably engage with a guide rail 131 provided in the elevator shaft 100 (see FIG. 1).

The accommodation chamber 61a of the housing 61 accommodates a pair of brakes 62A, 62B, a pair of guide members 63A, 63B, a biasing member 64, and a support member 65. The pair of brakes 62A, 62B face each other in the thickness direction of the frame body 31 with the guide rail 131 between them. Before the safety device 34 is activated, a predetermined gap is formed between the pair of brakes 62A, 62B and the guide rail 131.

The pair of brakes 62A, 62B are formed in a wedge shape. One surface of the pair of brakes 62A, 62B that faces the guide rail 131 is formed parallel to one surface of the guide rail 131. In addition, the other surface of the pair of brakes 62A, 62B opposite to the one surface that faces the guide rail 131 is inclined so as to approach the guide rail 131 as it goes from the bottom to the top.

The support member 65 supports the pair of brakes 62A, 62B so that they can move in the thickness direction of the frame body 31. A lifting rod 66 is connected to the support member 65. When the lifting rod 66 is lifted upward, the pair of brakes 62A, 62B and the support member 65 move upward.

The pair of brakes 62A, 62B are supported by a pair of guide members 63A, 63B so as to be movable up and down and in the thickness direction of the frame body 31. The guide member 63A is fixed to the wall surface of the storage chamber 61a in the housing 61. The guide member 63B is supported by the housing 61 so as to be movable in the thickness direction of the frame body 31. The pair of guide members 63A, 63B face each other at a predetermined interval in the thickness direction of the frame body 31, sandwiching the guide rail 131 and the pair of brakes 62A, 62B therebetween.

The surfaces of the guide members 63A and 63B that face the brakes 62A and 62B are inclined so as to approach the guide rail 131 as they move upward. Therefore, the distance between the surfaces of the pair of guide members 63A and 63B that face the brakes 62A and 62B narrows as they move upward.

The biasing member 64 is interposed between the guide member 63B and the wall surface of the storage chamber 61a in the housing 61. The biasing member 64 biases the guide member 63B toward the guide member 63A. For example, a disc spring may be used as the biasing member for the braking mechanism. A leaf spring or a compression coil spring may also be used.

The housing 61 is provided with a locking portion that prevents the guide member 63B from moving toward the guide member 63A. This prevents the guide member 63B from moving toward the guide member 63A beyond a predetermined position. On the other hand, the guide member 63B can move in a direction away from the guide member 63A against the biasing force of the biasing member 64.

When the lifting rod 66 is pulled upward, the pair of brakes 62A, 62B move upward relative to the pair of guide members 63A, 63B. As a result, the pair of brakes 62A, 62B engage with the pair of guide members 63A, 63B and move in a direction approaching each other, i.e., in a direction approaching the guide rail 131. Furthermore, the brake 62B is pressed against the guide rail 131 by the biasing force of the biasing member 64 via the guide member 63B. This brakes the lifting and lowering (up-down movement) of the counterweight 130.

[Configuration of the lifting mechanism]
Next, the configuration of the lifting mechanism 52 will be described with reference to FIGS.
Fig. 5 is a front view of the lifting mechanism 52. Fig. 6 is a side view of the lifting mechanism 52.

5 and 6, the lifting mechanism 52 has a lifting mechanism body 71 and a pair of link members 72A, 72B. A portion of the lifting mechanism body 71 is disposed within the frame body 31 below the lifting mechanism mounting member 53 (see FIG. 6). This allows the length of the lifting mechanism 52 protruding from the frame body 31 to be shortened. As a result, the counterweight 130 can be made thinner.

The lifting mechanism main body 71 has a rotating shaft 74, a shaft support portion 75 that rotatably supports both ends of the rotating shaft 74, connecting portions 76 and 77 fixed to the rotating shaft 74, and a biasing member 78 that biases the rotating shaft 74 in one rotational direction.

The rotating shaft 74 extends along the width direction of the frame body 31. The shaft support part 75 is formed in a housing shape that opens to the front side of the frame body 31. The shaft support part 75 has an upper surface plate 751 that forms the upper surface, a lower surface plate 752 that forms the lower surface, a rear surface plate 753 that forms the rear surface, and side surfaces plates 754, 755 that form the side surfaces.

The upper plate 751 is fixed by bolts to a lifting mechanism fixing portion 82 (described later) of the lifting mechanism mounting member 53. The lower plate 752 faces the upper plate 751 in the vertical direction. The rear plate 753 is continuous with the upper plate 751 and the lower plate 752. The side plates 754, 755 face each other in the width direction of the frame 31. The side plates 754, 755 are continuous with the upper plate 751, the lower plate 752, and the rear plate 753, respectively.

The side plates 754, 755 rotatably support both ends of the rotating shaft 74. Both ends of the rotating shaft 74 penetrate the side plates 754, 755. A stopper 79 is attached to the outer surface of the side plate 754. The stopper 79 comes into contact with the connecting portion 76 in the vertical direction. This allows the stopper 79 to lock the connecting portion 76 against rotation.

As shown in Figure 6, the connecting part 76 is formed in a substantially rectangular plate shape. One longitudinal end of the connecting part 76 is fixed to an end of the rotating shaft 74 that protrudes from the side plate 754. This allows the connecting part 76 to rotate together with the rotating shaft 74. A rope connection part 761 is provided at the other longitudinal end of the connecting part 76. The rope connection part 761 is connected to a governor rope (not shown). In addition, a link member 72A is connected to the longitudinal middle part of the connecting part 76.

As shown in Figure 5, the connecting portion 77 is formed in a generally rectangular plate shape that is shorter than the connecting portion 76. One longitudinal end of the connecting portion 77 is fixed to an end of the rotating shaft 74 that protrudes from the side plate 755. This allows the connecting portion 77 to rotate together with the rotating shaft 74. The other longitudinal end of the connecting portion 77 is connected to the link member 72A.

The biasing member 78 is a torsion spring through which the rotating shaft 74 passes. The biasing member 78 is disposed between the side plates 754, 755 of the shaft support portion 75. The biasing member 78 biases the rotating shaft 74 in the clockwise direction in FIG. 6. This biases the connecting portion 76 connected to the rotating shaft 74 in the clockwise direction. As a result, the downward-facing side of the connecting portion 76 abuts against the stopper 79. The connecting portion 76 abutting against the stopper 79 is stopped in a position in which its longitudinal direction is approximately parallel to the thickness direction (horizontal direction) of the frame body 31.

The governor rope (not shown) is formed in a so-called endless shape with both ends connected. The governor rope moves in a circular motion in accordance with the rising and lowering movement of the counterweight 130. Therefore, the moving speed of the governor rope and the rising and lowering speed of the counterweight 130 are linked to each other. When the moving speed of the governor rope is stopped, the relative positions of the counterweight 130 and the governor rope change, and the connecting portion 76 rotates counterclockwise in FIG. 6 against the biasing force of the biasing member 78.

Link members 72A and 72B are members bent into a substantially L-shape. As shown in FIG. 5, one end of link member 72A is rotatably connected to connecting portion 76 via collar 721 (see FIG. 2). The other end of link member 72A is rotatably connected to lifting rod 66 of brake mechanism 51A. When connecting portion 76 rotates against the biasing force of biasing member 78, link member 72A is displaced in response to the rotation of connecting portion 76, and pulls up lifting rod 66 of brake mechanism 51A.

One end of the link member 72B is rotatably connected to the connecting portion 77 (see FIG. 5). The other end of the link member 72B is rotatably connected to the lifting rod 66 of the brake mechanism 51B. When the connecting portion 77 rotates together with the rotating shaft 74 and the connecting portion 76 against the biasing force of the biasing member 78, the link member 72B is displaced in response to the rotation of the connecting portion 77, and pulls the lifting rod 66 of the brake mechanism 51B upward.

[Configuration of lifting mechanism mounting member]
Next, the configuration of the lifting mechanism mounting member 53 will be described with reference to FIGS.
FIG. 7 is an enlarged view of the lifting mechanism mounting member.

2 and 7, the lifting mechanism mounting member 53 has a pair of vertical frame connection parts 81A, 81B and a lifting mechanism fixing part 82. The pair of vertical frame connection parts 81A, 81B are formed in the shape of a rectangular plate. The vertical frame connection part 81A is fixed to the front of the pair of vertical frames 41A, 41B with a bolt. The vertical frame connection part 81B is fixed to the back of the pair of vertical frames 41A, 41B with a bolt.

As shown in Figure 7, the pair of vertical frame connection parts 81A, 81B face each other in the thickness direction of the frame body 31. The pair of vertical frame connection parts 81A, 81B are connected by bolts 84 and nuts 85. The pair of vertical frame connection parts 81A, 81B hold a plurality of second weight pieces 32B of the plurality of weight pieces 32.

The second weight pieces 32B are arranged between a pair of vertical frame connection parts 81A, 81B. The second weight pieces 32B have bolt through holes through which bolts 84 pass. That is, the second weight pieces 32B are attached to the pair of vertical frame connection parts 81A, 81B using bolts 84 and nuts 85.

As shown in Figure 7, the lifting mechanism fixing part 82 is a member bent into an L-shape. The lifting mechanism fixing part 82 has a vertical frame fixing plate 821 and a lifting mechanism fixing plate 822. The vertical frame fixing plate 821 is fixed to the vertical frame connection part 81A with a bolt. The shaft support part 75 of the lifting mechanism 52 is fixed to the lifting mechanism fixing plate 822 with a bolt.

The lifting mechanism fixing part 82 may be fixed to the vertical frame connection part 81B. The lifting mechanism fixing part for the lifting mechanism mounting member may be formed by bending into a substantially C-shape and fixed to the pair of vertical frame connection parts 81A, 81B.

[Configuration of the buffer table mounting member]
Next, the configuration of the buffer table mounting member 54 will be described with reference to FIGS.
FIG. 8 is a side view of the buffer platform mounting member.

2 and 8, the buffer table mounting member 54 is disposed below the lifting mechanism body 71. The buffer table mounting member 54 has a pair of buffer table connection parts 86A, 86B and a buffer table fixing part 87.

The pair of buffer table connection parts 86A, 86B are formed in a rectangular plate shape. The buffer table connection part 86A is fixed to the front of the pair of vertical frames 41A, 41B with bolts. The buffer table connection part 86B is fixed to the back of the pair of vertical frames 41A, 41B with bolts. The pair of buffer table connection parts 86A, 86B also serve as a pair of lower frames that connect the lower parts of the pair of vertical frames 41A, 41B.

As shown in Fig. 8, the pair of buffer stand connection parts 86A, 86B face each other in the thickness direction of the frame body 31. The pair of buffer stand connection parts 86A, 86B are connected by a bolt 84 and a nut 85. The pair of buffer stand connection parts 86A, 86B hold the third weight pieces 32C of the weight pieces 32.

The third weight pieces 32C are disposed between a pair of buffer table connection parts 86A, 86B. The third weight pieces 32C have bolt through holes through which the bolts 84 pass. That is, the third weight pieces 32C are attached to the pair of buffer table connection parts 86A, 86B using the bolts 84 and nuts 85.

The buffer table fixing part 87 is a member bent into a substantially C-shape. The buffer table fixing part 87 has vertical frame fixing plates 871A, 871B and a lifting mechanism fixing plate 872 that is substantially perpendicular to the vertical frame fixing plates 871A, 871B.

As shown in Figure 8, the vertical frame fixing plate 871A is fixed to the buffer table connection part 86A with a bolt. The vertical frame fixing plate 871B is fixed to the buffer table connection part 86B with a bolt. The buffer table 35 is fixed to the lifting mechanism fixing plate 872 with a bolt.

2. Summary As described above, the counterweight 130 according to this embodiment includes the frame 31 that moves while being guided by the guide rail 131 provided in the elevator shaft 100, a plurality of first weight pieces 32A arranged in the frame 31, braking mechanisms 51A and 51B, a lifting mechanism 52, and a lifting mechanism mounting member 53. The braking mechanisms 51A and 51B are connected to the frame and have brakes 62A and 62B that are lifted up to clamp the guide rail 131 and stop the movement of the frame 31. The lifting mechanism 52 lifts the brakes 62A and 62B. The lifting mechanism mounting member 53 mounts the lifting mechanism 52 to the frame 31 and holds the second weight pieces 32B.
As a result, even when the braking mechanisms 51A, 51B and the lifting mechanism 52 are provided, a space for loading the second weight pieces 32B can be secured under the frame 31, and the number of weight pieces to be loaded can be increased. As a result, it is not necessary to form the weight pieces from an expensive material with a high specific gravity. The weight required for the counterweight 130 can be secured.

In addition, the counterweight 130 according to the above-described embodiment includes a buffer table 35 that contacts a buffer device installed at the bottom of the elevator shaft 100, and a buffer table mounting member 54 that fixes the buffer table 35 to the frame body 31 and holds the third weight piece 32C.
This makes it possible to secure a space for loading the third weight piece 32C under the frame 31, and to increase the number of weight pieces to be loaded. As a result, the weight required for the counterweight 130 can be secured without forming the weight piece from an expensive material having a high specific gravity.

The lifting mechanism 52 according to the embodiment described above has a lifting mechanism body 71 fixed to the lifting mechanism mounting member 53, and link members 72A, 72B interposed between the lifting mechanism body 71 and the brakes 62A, 62B. The buffer table mounting member 54 is disposed below the lifting mechanism body 71.
This eliminates the need to form the buffer table 35 in a shape that avoids interference with the lifting mechanism body 71. As a result, the buffer table 35 can be formed in a simple shape, and the durability of the buffer table 35 can be increased.

Furthermore, a portion of the lifting mechanism main body 71 according to the embodiment described above is disposed within the frame 31 below the lifting mechanism mounting member 53 .
This makes it possible to reduce the length of the lifting mechanism 52 that protrudes from the frame 31. As a result, the counterweight 130 can be made thinner.

Moreover, the frame body 31 according to the embodiment described above has a pair of vertical frames 41A, 41B. The lifting mechanism mounting member 53 has vertical frame connection parts 81A, 81B that are connected to the pair of vertical frames 41A, 41B and hold the second weight piece 32B, and a lifting mechanism fixing part 82 that is connected to the vertical frame connection part 81A (or 81B) and to which the lifting mechanism main body 71 is fixed.
This allows the lifting mechanism main body 71 to be attached to and detached from the lifting mechanism fixing part 82 while keeping the vertical frame connecting parts 81A, 81B that hold the second weight piece 32B connected to the pair of vertical frames 41A, 41B. As a result, the assembly work of the counterweight 130 can be performed efficiently.

The frame 31 according to the embodiment described above has a pair of vertical frames 41A, 41B. The buffer table mounting member 54 has buffer table connecting parts 86A, 86B that are connected to the pair of vertical frames 41A, 41B and hold the third weight piece 32C, and a buffer table fixing part 87 that is connected to the buffer table connecting parts 86A, 86B and to which the buffer table 35 is fixed.
This allows the buffer stand 35 to be attached to and detached from the buffer stand fixing part 87 while the buffer stand connecting parts 86A and 86B that hold the third weight piece 32C are connected to the pair of vertical frames 41A and 41B. As a result, the assembly work of the counterweight 130 can be performed efficiently.

Further, the buffer stand connection portions 86A, 86B according to the above-described embodiment also serve as lower frames that connect the lower portions of the pair of vertical frames 41A, 41B.
This makes it possible to reduce the number of parts and increase the rigidity of the frame 31 .

Moreover, the elevator 1 according to the embodiment described above drives the car 110 and the counterweight 130 connected by the rope 170 to move up and down in different directions. The counterweight 130 includes a frame 31 that moves while being guided by a guide rail 131 provided in the elevator shaft 100, a plurality of first weight pieces 32A arranged in the frame 31, braking mechanisms 51A and 51B, a lifting mechanism 52, and a lifting mechanism mounting member 53. The braking mechanisms 51A and 51B are connected to the frame and have brakes 62A and 62B that are lifted up to clamp the guide rail 131 and stop the movement of the frame 31. The lifting mechanism 52 lifts up the brakes 62A and 62B. The lifting mechanism mounting member 53 mounts the lifting mechanism 52 to the frame 31 and holds the second weight piece 32B.
As a result, even when the braking mechanisms 51A, 51B and the lifting mechanism 52 are provided, a space for loading the second weight pieces 32B can be secured under the frame 31, and the number of weight pieces to be loaded can be increased. As a result, it is not necessary to form the weight pieces from an expensive material having a high specific gravity. The weight required for the counterweight 130 can be secured.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications are possible without departing from the spirit of the invention described in the claims.

In the above-described embodiment, the lifting mechanism 52 is configured to use a torsion spring as the biasing member 78. However, the counterweight according to the present invention may be configured to use, for example, a lifting mechanism that uses a compression coil spring.

In the above-described embodiment, the braking mechanisms 51A and 51B are configured to use disc springs as the biasing members 64. However, the counterweight according to the present invention may be configured to include a braking mechanism that biases two brakes using a leaf spring having a U-shaped cross section cut horizontally, for example.

In the above-described embodiment, the vertical frame connection parts 81A, 81B of the lifting mechanism mounting member 53 are configured to hold multiple second weight pieces 32B. However, the lifting mechanism mounting member according to the present invention may be configured to hold at least one second weight piece 32B.

In the above-described embodiment, the buffer table connection parts 86A and 86B of the buffer table mounting member 54 are configured to hold a plurality of third weight pieces 32C. However, the buffer table mounting member according to the present invention may be configured to hold at least one third weight piece 32C.

In the above-described embodiment, the lifting mechanism mounting member 53 holds the plurality of second weight pieces 32B, and the buffer table mounting member 54 holds the plurality of third weight pieces 32C. However, the counterweight according to the present invention may be configured such that the lifting mechanism mounting member and the buffer table mounting member hold a common weight piece.

In this specification, the words "parallel" and "orthogonal" are used, but these do not mean only "parallel" and "orthogonal" in the strict sense, but also include "parallel" and "orthogonal" and may also refer to a state of "approximately parallel" or "approximately orthogonal" within a range in which the functions can be exerted.

1...Elevator, 31...Frame, 32...Plumb, 32A...First plumb, 32B...Second plumb, 32C...Third plumb, 33...Plumb side pulley, 34...Emergency stop device, 35...Buffer stand, 41A, 41B...Vertical frame, 42...Upper frame, 43...Upper guide shoe, 44...Lower guide shoe, 45...Support, 51A, 51B...Braking mechanism, 52...Lifting mechanism, 53...Lifting mechanism mounting member, 54...Buffer stand mounting member, 61...Housing, 61a...Accommodation chamber, 62A, 62B...Brake, 63A, 63B...Guide member, 64...Biasing member (bellows spring), 65...Support member, 66...Lifting rod, 71...Lifting mechanism body, 72A, 72B...Link member, 74...Rotating shaft, Description of the symbols 75...shaft support portion, 76, 77...connecting portion, 78...biasing member (torsion spring), 79...stopper, 81A, 81B...vertical frame connection portion, 82...lifting mechanism fixing portion, 84...bolt, 85...nut, 86A, 86B...buffer table connection portion, 87...buffer table fixing portion, 100...hoistway, 111...lifting pulley, 120...hoisting machine, 130...counterweight, 131...guide rail, 140...first driven pulley, 150...second driven pulley, 170...rope, 721...collar, 751...upper surface plate, 752...lower surface plate, 753...back surface plate, 754, 755...side surface plate, 761...rope connection portion, 821...vertical frame fixing plate, 822...lifting mechanism fixing plate, 871A, 871B...vertical frame fixing plate, 872...lifting mechanism fixing plate

Claims (8)

A frame body that moves while being guided by a guide rail provided in the elevator shaft;
A plurality of first weights disposed within the frame;
a braking mechanism having a brake connected to the frame body and pulled up to clamp the guide rail and stop the movement of the frame body;
A lifting mechanism that lifts up the brake shoe;
a lifting mechanism mounting member that mounts the lifting mechanism to the frame and holds a second weight piece. A buffer table that contacts a buffer device installed at the bottom of the elevator shaft;
The counterweight according to claim 1 , further comprising: a buffer base mounting member that fixes the buffer base to the frame and holds a third weight piece. The lifting mechanism includes a lifting mechanism body fixed to the lifting mechanism mounting member, and a link member interposed between the lifting mechanism body and the brake shoe,
The counterweight according to claim 2 , wherein the buffer platform mounting member is disposed below the lifting mechanism body. The counterweight according to claim 3 , wherein a portion of the lifting mechanism body is disposed within the frame below the lifting mechanism mounting member. The frame body has a pair of vertical frames,
The lifting mechanism mounting member is
A vertical frame connection portion connected to the pair of vertical frames and holding the second weight piece;
The counterweight according to claim 3 , further comprising: a lifting mechanism fixing part connected to the vertical frame connecting part and to which the lifting mechanism main body is fixed. The frame body has a pair of vertical frames,
The buffer table mounting member is
a buffer stand connection portion connected to the pair of vertical frames and holding the third weight piece;
The counterweight according to claim 2 , further comprising: a buffer table fixing portion connected to the buffer table connection portion and to which the buffer table is fixed. The counterweight according to claim 6 , wherein the buffer stand connection portion also serves as a lower frame that connects lower portions of the pair of vertical frames. In an elevator in which a car and a counterweight connected by a rope are driven to rise and fall in different directions,
The counterweight is
A frame body that moves while being guided by a guide rail;
A plurality of first weights arranged within the frame;
a braking mechanism having a brake connected to the frame body and pulled up to clamp the guide rail and stop the movement of the frame body;
A lifting mechanism that lifts up the brake shoe;
An elevator comprising: a lifting mechanism mounting member that mounts the lifting mechanism to the frame and holds a second weight piece.

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