CN114364627B

CN114364627B - Lifter for construction

Info

Publication number: CN114364627B
Application number: CN201980099855.5A
Authority: CN
Inventors: 樋野悠人; 五十岚章智; 萩原高行
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2023-07-14
Anticipated expiration: 2039-09-17
Also published as: WO2021053712A1; JP7340025B2; CN114364627A; JPWO2021053712A1

Abstract

The invention provides a construction lifter, which comprises a guide rail, a machine room unit, a lift car and a crane. The machine room unit has a casing on which a hoisting machine is mounted. The machine room unit has: an emergency stop device for stopping the lifting movement of the mechanical chamber unit; and a speed detecting device provided in the case and configured to operate the emergency stop device when the lifting speed of the machine room unit is equal to or higher than a predetermined speed. The emergency stop device has a brake member which is opposed to the guide rail with a gap therebetween in a normal state in which the emergency stop device is not operated, and which is brought into contact with the guide rail when operated.

Description

Lifter for construction

Technical Field

The present invention relates to a construction elevator.

Background

In recent years, a construction elevator has been proposed as an elevator for transporting materials and workers at the time of building construction. The elevator for construction is configured to expand the lifting range of the car by lifting a machine room unit having a hoisting machine, a control board, and the like according to the progress of construction of a building.

In addition, as a safety device, an emergency stop device for stopping the lifting movement of the machine room unit in an emergency in order to prevent the machine room unit from falling is provided in the construction hoist (for example, refer to patent document 1).

Prior art literature

Patent literature

Patent document 1: international publication No. 2012/072860

Disclosure of Invention

Technical problem to be solved by the invention

However, in the technique disclosed in patent document 1, a stopper of an emergency stop device that clamps a guide rail to stop the lifting movement of a machine room unit is always in contact with the guide rail. Therefore, when the machine room unit is moved up and down, the brake member rubs against the guide rail, and there is a risk of damage to the guide rail.

When the machine room unit is installed at a predetermined position in the elevating path, the machine room unit is first raised to a position above the predetermined position, and then lowered to be installed at the predetermined position. Therefore, in the technique disclosed in patent document 1, when the machine room unit is lowered, the emergency stop device is operated, and when the machine room unit is again moved up and down, the emergency stop device needs to be released from operation. As a result, in the technique disclosed in patent document 1, the operation of moving the machine room unit up and down to set the machine room unit at a predetermined position is very troublesome.

In view of the above, an object of the present invention is to provide a construction hoist capable of easily performing installation work of a machine room unit without damaging a guide rail.

Means for solving the problems

In order to solve the above problems, the construction hoist includes a guide rail, a machine room unit, a car, and a crane, which are vertically installed in a lifting path of a building.

The machine room unit has a case body supported on the guide rail in a liftable manner and carrying a hoisting machine. The car is supported on the guide rail in a liftable manner and is connected with a rope wound around the traction machine. The crane moves the machine room unit up and down.

The machine room unit has: an emergency stop device provided in the case for stopping the lifting movement of the machine room unit; and a speed detecting device provided in the case and configured to operate the emergency stop device when the lifting speed of the machine room unit is equal to or higher than a predetermined speed. The emergency stop device has a brake member which is opposed to the guide rail with a gap therebetween in a normal state in which the emergency stop device is not operated, and which is brought into contact with the guide rail when operated.

Effects of the invention

According to the construction hoist of the above-described configuration, the installation work of the machine room unit can be easily performed without damaging the guide rail.

Drawings

Fig. 1 is a schematic configuration diagram showing a construction hoist according to a first embodiment.

Fig. 2 is a front view showing a speed detecting device of the construction hoist according to the first embodiment.

Fig. 3 is a schematic configuration diagram showing an emergency stop device of the construction hoist according to the first embodiment.

Fig. 4 is an explanatory diagram showing an installation operation of the machine room unit of the construction hoist according to the first embodiment.

Fig. 5 is an explanatory diagram showing an installation operation of the machine room unit of the construction hoist according to the first embodiment.

Fig. 6 is an explanatory diagram showing an installation operation of the machine room unit of the construction hoist according to the first embodiment.

Fig. 7 is a front view showing a state after the operation of the speed detecting device of the construction hoist according to the first embodiment.

Fig. 8 is a schematic configuration diagram showing a state after the emergency stop device of the construction hoist according to the first embodiment is operated.

Fig. 9 is a schematic configuration diagram showing a speed detection device and a guide portion of a construction hoist according to a second embodiment.

Detailed Description

Hereinafter, a construction hoist according to an embodiment will be described with reference to fig. 1 to 9. In the drawings, common components are denoted by the same reference numerals.

1. First embodiment example

1-1 structural example of construction Elevator

First, the construction hoist according to a first embodiment (hereinafter referred to as "this embodiment") will be described with reference to fig. 1.

Fig. 1 is a schematic configuration diagram showing the construction hoist of this example.

The elevator shown in fig. 1 is a construction elevator used for transporting materials and operators during construction of a building. As shown in fig. 1, the construction hoist 1 includes a guide rail 2 vertically provided along a lifting path 201 of a building 200, a machine room unit 3, a car 4 for carrying workers and materials, a support member 5, and a crane 6 for hoisting the machine room unit 3. The car 4 and the machine room unit 3 move up and down along the guide rail 2. Hereinafter, the direction in which the car 4 and the machine room unit 3 move up and down is referred to as the up-down direction. A support recess 202 is formed in the wall surface 201a of the elevation path 201 to support the support member 5 and the machine chamber unit 3.

The machine room unit 3 includes a casing 10, a hoisting machine 11, a fixing mechanism 15, a guide 16, an emergency stop device 20, and a speed detection device 21. A driving device for moving the car 4 up and down, such as a hoisting machine 11 and a control board, not shown, for controlling the driving of the hoisting machine 11, is mounted in the casing 10.

The case 10 is provided with a guide 16. The guide portion 16 is a slider slidably engaged with the guide rail 2. The case 10 is supported by the guide rail 2 in a vertically movable manner by a guide portion 16.

Further, a

fixing mechanism

15 and 2

emergency stop devices

20, 20 are disposed at the lower part of the case 10 in the up-down direction. A speed detecting device 21 is disposed at an upper portion of the casing 10 in the up-down direction. The speed detecting device 21 detects the lifting speed of the casing 10, and when the lowering speed of the casing 10 reaches a predetermined speed, the emergency stop device 20 is operated by the lift rod 22.

The 2

emergency stop devices

20, 20 are disposed at positions facing the guide rail 2 in the lower portion of the case 10. The 2

emergency stop devices

20 and 20 are connected via a link member not shown. The 2

emergency stop devices

20 and 20 are operated in linkage by a link member not shown. When the emergency stop device 20 is operated, the rail 2 is held, and the lifting movement of the casing 10 is stopped in an emergency. The detailed structures of the emergency stop device 20 and the speed detection device 21 will be described later.

The fixing mechanism 15 is configured to be extendable and retractable from the housing 10 with respect to the wall surface 201a of the elevating path 201. The fixing mechanism 15 can be inserted into a support recess 202 formed in the elevating path 201. The fixing mechanism 15 supports the machine room unit 3 at a predetermined position in the elevating path 201. The fixing mechanism 15 is not limited to the above-described structure, and various other fixing mechanisms such as an engaging member engaged with the guide rail 2 or the wall surface 201a of the elevating path 201, or a fastening member fastened to the wall surface 201a may be applied.

The hoisting machine 11 is provided in the casing 10. A rope 13 is wound around a sheave of the hoisting machine 11, and both ends thereof hang down in the vertical direction of the casing 10. The car 4 is connected to one end of the rope 13, and a counterweight, not shown, is connected to the other end of the rope 13.

The car 4 is disposed below the machine room unit 3 in the up-down direction. The car 4 is provided with a car-side guide 26 slidably engaged with the guide rail 2. The car 4 is lifted and lowered along the guide rail 2 by the car-side guide 26 by driving the hoisting machine 11.

A support member 5 is disposed above the machine room unit 3 in the vertical direction. The support member 5 supports the machine room unit 3 via a crane 6. The movable support portions 25 are provided at both end portions of the support member 5. The movable support portion 25 is configured to be extendable and retractable. The support member 5 is transported to a predetermined position of the elevating path 201 by a crane or a worker. The support member 5 is provided in the elevating path 201 by inserting the movable support portion 25 into the support concave 202.

The structure in which the support member 5 is provided in the elevating path 201 is not limited to the above example. As the support member 5, other various structures such as an engagement member engaged with the guide rail 2 or the wall surface 201a of the elevating path 201, a fastening member fastened to the wall surface 201a, and the like may be applied as in the fixing mechanism 15 of the machine room unit 3.

The crane 6 is provided at an upper portion in the up-down direction of the housing 10 of the machine room unit 3. A hoisting cable 6a of the crane 6 is connected to the support part 5. The box 10 of the machine room unit 3 is moved up and down along the guide rail 2 by driving of the crane 6. In this example, the crane 6 is provided in the machine room unit 3 and the hoisting cable 6a is connected to the support member 5, but the present invention is not limited thereto. For example, a crane 6 may be provided to the support member 5, and the crane cable 6a may be connected to the housing 10 of the machine room unit 3.

1-2. Structural example of speed detecting device

Next, the structure of the speed detection device 21 will be described with reference to fig. 2.

Fig. 2 is a front view showing the speed detecting device 21.

As shown in fig. 2, the speed detecting device 21 includes a support base 31, a frame 32, a rotating

body

33, 2

pendulums

34 and 35, and an actuating mechanism 36, which are placed on the upper portion of the casing 10.

The frame 32 is mounted on the support block 31, and is fixed to the support block 31 via a fixing member not shown. The frame 32 is provided with a rotation shaft 41. The rotating body 33 is rotatably supported by the rotating shaft 41. The rotating body 33 is rotatably supported by the frame 32, and its outer peripheral surface is in contact with the guide rail 2. Therefore, when the case 10 moves up and down, the rotating body 33 rotates about the rotation shaft 41.

By rotating the rotating body 33 in direct contact with the guide rail 2, it is not necessary to provide a member for rotating the rotating body 33, and the number of components can be reduced.

2

pendulum shafts

42, 43 are fixed to the rotating body 33. The first pendulum shaft 42 and the second pendulum shaft 43 are disposed at positions facing each other with the rotation shaft 41 interposed therebetween.

The first pendulum 34 is rotatably supported by a first pendulum shaft 42. The second pendulum 35 is rotatably supported by the second pendulum shaft 43. The first pendulum 34 and the second pendulum 35 are formed in a substantially circular arc shape.

Pendulum shafts

42, 43 penetrate through positions offset from the center of gravity of

pendulum shafts

34, 35.

The first pendulum 34 has one end 34a and the other end 34b bordered by a first pendulum shaft 42. One end 34a is set to be heavier than the other end 34b. The second pendulum 35 has one end 35a and the other end 35b bordered by the second pendulum shaft 43. One end 35a is set to be heavier than the other end 35b.

When the rotor 33 rotates, the

pendulums

34 and 35 rotate about the

pendulum shafts

42 and 43 due to centrifugal force. One

end portions

34a, 35a of the

pendulums

34, 35 are displaced outward in a direction away from the rotation shaft 41, that is, in the radial direction of the rotating body 33. The other ends 34b, 35b of the

pendulums

34, 35 are displaced in a direction approaching the rotation shaft 41. The first pendulum 34 and the second pendulum 35 are coupled by a coupling member 44. Therefore, the displacement amount (rotation amount) of the first pendulum 34 by the centrifugal force is the same as the displacement amount of the second pendulum 35 by the centrifugal force.

One end of a balance spring 45 is fixed to the other end 35b of the second pendulum 35. The other end of the balance spring 45 is fixed to the rotating body 33. The balance spring 45 generates resistance against displacement of the other end 34b of the second pendulum 35 in a direction approaching the rotation shaft 41. That is, when the centrifugal force acting on the

pendulum

34 or 35 exceeds the resistance of the balance spring 45, the balance spring 45 elastically deforms (compresses), and the

pendulum

34 or 35 rotates about the

pendulum shaft

42 or 43.

The actuator 36 includes a hook member 51, an actuator arm 52, and a biasing member 54. The hook member 51 is rotatably supported by a hook rotation shaft 53 provided to the frame 32. A locking portion 51a is formed at one end of the hook member 51. The other end 51b of the hook member 51 is inserted into the inside of the rotating body in the radial direction. When the

pendulums

34 and 35 rotate about the

pendulum shafts

42 and 43 due to centrifugal force, the one

end portions

34a and 35a of the

pendulums

34 and 35 are displaced radially outward of the rotating body 33, the one

end portions

34a and 35a of the

pendulums

34 and 35 come into contact with the other end portion 51b of the hook member 51.

One end portion of the actuator arm 52 in the longitudinal direction is provided in the support block 31 and is rotatably supported by the support portion 31a via the rotation shaft 55. The other end portion of the actuation arm 52 in the longitudinal direction is connected to the lift bar 22 via a connecting portion 57. Further, an engagement pin 56 is provided at a longitudinal middle portion of the actuator arm 52. The locking portion 51a of the hook member 51 is releasably locked to the locking pin 56. When the locking portion 51a is locked to the locking pin 56, the rotation operation of the actuator arm 52 is restricted.

The biasing member 54 is positioned between the support seat 31 and the actuator arm 52 in a compressed state. The biasing member 54 biases the other end portion of the actuator arm 52 in a direction in which the other end portion rotates upward in the up-down direction. As the urging member 54, for example, a compression spring is applied. The biasing member 54 is not limited to a compression spring, and various other elastic members such as rubber and a leaf spring may be applied.

When the engagement between the engagement pin 56 and the engagement portion 51a is released, the actuator arm 52 is biased upward in the vertical direction by the biasing member 54. Then, the actuator arm 52 rotates about the rotation shaft 55, and the other end portion of the actuator arm 52 goes upward in the vertical direction. As a result, the lift bar 22 connected to the actuator arm 52 via the connecting portion 57 is lifted upward in the vertical direction.

The structures of the speed detecting device 21 and the actuating mechanism 36 are not limited to the above-described structures, and various other structures such as providing 2 balance springs, providing a ratchet mechanism, and the like can be applied.

1-3 structural examples of Emergency stop devices

Next, the structure of the emergency stop device 20 will be described with reference to fig. 3.

Fig. 3 is a schematic configuration diagram showing the emergency stop device 20.

As shown in fig. 3, the emergency stop device 20 has a housing 71, a pair of stoppers 72, a pair of rollers 73, and a pair of

guide members

74, 74. In the housing 71, a pair of stoppers 72, a pair of rollers 73, and a pair of guide members 74 are arranged. The pair of

guide members

74, 74 are supported by the housing 71 and are disposed at positions facing each other with the guide rail 2 interposed therebetween. The interval between the pair of

guide members

74, 74 is kept constant by the case 71.

The guide member 74 has an inclined surface 74a. The inclined surface portion 74a is formed on the surfaces of the pair of guide members 74 that face each other. The inclined surface 74a is inclined so as to continuously approach the guide rail 2 as going upward in the up-down direction. Therefore, the interval between the inclined surface portions 74a of the pair of

guide members

74, 74 becomes narrower as going upward in the up-down direction.

The roller 73 is disposed on the inclined surface 74a. The roller 73 is guided movably in the up-down direction to the pair of

stoppers

72, 72. The pair of

stoppers

72, 72 are supported by a holding member, not shown, so as to be movable in the directions of approaching and separating from each other. In addition, the stopper 72 is formed in a wedge shape.

A pair of

stoppers

72, 72 is arranged between the guide rail 2 and the roller 73 and the guide member 74. In a normal state in which the emergency stop device 20 shown in fig. 3 is not operated, the pair of stoppers 72 are disposed under the guide member 74 in the vertical direction due to their own weight. At this time, the stopper 72 is disposed with a gap S1 from the rail 2.

In addition, a pair of

stoppers

72, 72 are connected to the lifting bar 22 (refer to fig. 2 and 3). When the lift bar 22 is lifted upward in the up-down direction, the pair of

stoppers

72, 72 move upward along the roller 73 in the up-down direction together with the lift bar 22.

The example in which the stopper 72 is formed in a wedge shape has been described, but the present invention is not limited thereto, and the stopper 72 may be formed in a spherical shape. In addition, the shape of the stopper 72 is preferably wedge-shaped as compared with a sphere in order to increase the contact area with the rail 2 during operation. The urging members may be provided to hold the pair of

guide members

74, 74 at a predetermined interval, and the structure of the emergency stop device 20 is not limited to the above-described structure.

1-4 examples of the installation operation of the machine Chamber Unit

Next, an example in which the machine room unit 3 is installed at an arbitrary position in the lifting path 201 in order to expand the lifting range of the car 2 according to the progress situation of the construction of the building 200 will be described with reference to fig. 4 to 6.

Fig. 4 to 6 are explanatory views showing the installation operation of the machine room unit 3.

First, as shown in fig. 4, the machine room unit 3 is lifted up by the crane 6. Thereby, the load applied to the fixing mechanism 15 disappears. The fixing mechanism 15 is contracted, and the fixing mechanism 15 is pulled out of the support recess 202A.

Subsequently, the machine room unit 3 is lifted up to a predetermined position by the crane 6. At this time, as shown in fig. 3, the pair of

stoppers

72, 72 of the emergency stop device 20 do not contact the guide rail 2. As a result, the stopper 72 can be prevented from rubbing against the rail 2 to damage the rail 2 when the machine room unit 3 moves up and down.

In addition, the rotating body 33 (see fig. 2) of the speed detection device 21 rotates with the upward movement of the machine room unit 3. The machine room unit 3 rises at a speed at which the centrifugal force acting on the

pendulums

34, 35 does not exceed the resistance of the balance spring 45. Therefore, the emergency stop device 20 does not operate by the actuating mechanism 36 of the speed detection device 21.

Next, as shown in fig. 5, when the casing 10 of the machine room unit 3 is lifted up to a position where the fixing mechanism 15 faces the support recess 202B arranged above the support recess 202A, the driving of the crane 6 is stopped. Thereby, the upward movement of the machine room unit 3 is stopped. At this time, the machine room unit 3 is lifted up to a position above the machine room unit 3 in the vertical direction, and the machine room unit 3 is stopped. Then, the fixing mechanism 15 is extended, and the fixing mechanism 15 is inserted into the support recess 202B.

As shown in fig. 6, when the fixing mechanism 15 is inserted into the support recess 202B, the crane 6 is driven to lower the machine room unit 3. Thus, the fixing mechanism 15 is placed in the support recess 202B, and the case 10 of the machine room unit 3 is supported at an arbitrary position by the fixing mechanism 15. This completes the installation work of the machine room unit 3, and expands the liftable range of the car 4.

When the machine room unit 3 is moved downward, the downward speed of the machine room unit 3 is such that the centrifugal force acting on the

pendulums

34 and 35 does not exceed the resistance of the balance spring 45, and the pair of

stoppers

72 and 72 of the emergency brake device 20 do not contact the guide rail 2. Therefore, the emergency stop device 20 does not operate unintentionally when the machine room unit 3 moves downward.

As a result, the fixing mechanism 15 can be smoothly placed in the support recess 202B, and the installation work of the machine room unit 3 can be easily performed. Further, the machine room unit 3 can be immediately moved up and down without performing a recovery operation of the emergency stop device 20.

In a general elevator, a governor for detecting the speed of a car is provided at the upper part of a hoistway, and a governor rope connected to the car is wound around a sheave of the governor. In contrast, in the construction hoist 1 of the present example, the speed detecting device 21 that detects the speed of the machine room unit 3 is provided in the case 10 that moves up and down. Thus, the number of components can be reduced without the need for a timing rope, a pulley, or the like. Further, since the governor rope is not provided, even if the machine room unit 3 moves up and down, the position in the elevating path 201 changes, and the operation of adjusting the length, tension, and the like of the governor rope is not required, so that the installation operation of the machine room unit 3 can be easily performed.

1-5 operation of speed detection device and Emergency stop device

Next, an operation example of the speed detecting device 21 and the emergency stop device having the above-described configuration will be described with reference to fig. 7 and 8.

Fig. 7 is a diagram showing a state in which the speed detection device 21 is operated, and fig. 8 is a diagram showing a state in which the emergency stop device 20 is operated.

When the lowering speed (lifting speed) of the machine room unit 3 becomes equal to or higher than a predetermined speed due to an abnormality of the crane 6 or the cutting of the hoisting rope 6a, the rotation speed of the rotating body 33 of the speed detecting device 21 increases. The

pendulums

34 and 35 rotate about the

pendulum shafts

42 and 43 due to centrifugal force, and the one

end portions

34a and 35a of the

pendulums

34 and 35 are displaced radially outward of the rotating body 33 against the resistance of the balance spring 45. Therefore, as shown in fig. 7, the one ends 34a, 35a of the

pendulums

34, 35 are abutted against the other end 51b of the hook member 51.

Then, the hook member 51 rotates about the hook rotation shaft 53, and the locking of the locking pin 56 and the locking portion 51a is released. Thus, the actuator arm 52 rotates about the rotation shaft 55 by the urging force of the urging member 54, and the other end portion of the actuator arm 52 moves upward in the vertical direction. As a result, the lift bar 22 connected to the actuator arm 52 via the connecting portion 57 is lifted upward in the vertical direction.

As the lifting bar 22 is lifted upward in the up-down direction, as shown in fig. 8, the pair of

stoppers

72, 72 connected to the lifting bar 22 move upward in the up-down direction along the roller 73 and the guide member 74. The pair of

stoppers

72, 72 move upward in the vertical direction, thereby moving in a direction approaching the guide rail 2, and come into contact with the guide rail 2. Thus, the pair of

stoppers

72, 72 sandwich the guide rail 2, and stop the descending movement mechanism of the machine room unit 3. As a result, the machine room unit 3 can be prevented from falling, and the safety of the construction hoist 1 can be improved.

2. Second embodiment example

Next, a construction hoist according to a second embodiment will be described with reference to fig. 9.

Fig. 9 is a plan view showing a guide portion and a speed detecting device of the construction hoist according to the second embodiment.

The construction hoist according to the second embodiment differs from the construction hoist 1 according to the first embodiment in the structure of the guide portion and the structure for rotating the rotating body 33 of the speed detecting device 21. Therefore, the same reference numerals are given to the portions common to the construction hoist 1 according to the first embodiment, and the duplicate description is omitted.

As shown in fig. 9, a guide 80 and a speed detecting device 21 are disposed at the upper portion of the casing 10. The guide portion 80 has a

rotation support portion

82 and 3 guide rollers 84A, 84B, 84C rotatably supported by the rotation support portion 82.

The second guide roller 84B and the third guide roller 84C are disposed opposite to each other with the guide rail 2 interposed therebetween. The first guide roller 84A is disposed between the second guide roller 84b and the third guide roller 84C so as to face the guide rail 2. 3 guide rollers 84A, 84B, 84C are in contact with the guide rail 2. Along with the lifting movement of the casing 10 of the machine room unit 3, the 3 guide rollers 84A, 84B, 84C rotate.

The first guide roller 84A and the rotating body 33 of the speed detecting device 21 are coupled by a synchronizing shaft 85. The rotational force of the first guide roller 84A is transmitted to the rotating body 33 of the speed detecting device 21 through the synchronizing shaft 85. Therefore, when the housing 10 moves up and down and the first guide roller 84A rotates, the rotating body 33 of the speed detecting device 21 also rotates. This allows the lifting speed of the case 10 to be detected.

In the construction hoist according to the second embodiment, when the lowering speed (lifting speed) of the machine room unit 3 is equal to or higher than a predetermined speed, the rotation speed of the rotating body 33 of the speed detecting device 21 is increased, and the actuating mechanism 36 (see fig. 7) of the speed detecting device 21 is operated. As a result, the lifting rod 22 is lifted upward in the vertical direction by the actuator arm 52 of the speed detection device 21, and the emergency stop device 20 operates.

Other structures are the same as those of the construction hoist 1 according to the first embodiment, and therefore, their description is omitted. According to the construction hoist having such a structure, the same operational effects as those of the construction hoist 1 according to the first embodiment can be obtained.

In the construction hoist according to the second embodiment, an adjustment mechanism for adjusting the rotation speed may be provided in the synchronizing shaft 85.

The present invention is not limited to the embodiments described above and shown in the drawings, and can be variously modified and implemented within a scope not departing from the gist of the present invention.

In the present specification, the terms "parallel" and "orthogonal" are used, but these terms do not mean strictly "parallel" and "orthogonal", but may include "parallel" and "orthogonal", and further "substantially parallel" and "substantially orthogonal" states within a range where the functions thereof can be exhibited.

Description of the reference numerals

The construction hoist of 1 … …, the guide rail of 2 … …, the machinery room unit of 3 … …, the car of 4 … …, the supporting member of 5 … …, the hoist of 6 … …, the hoist rope of 6a … …, the hoist rope of 10 … …, the hoist of 11 … …, the hoist rope of 13 … …, the 15 … … fixing mechanism, the guide portion of 16 … …, the emergency stop device of 20 … …, the speed detecting device of 21 … …, the lifting rod of 22 … …, the movable supporting portion of 25 … …, the supporting seat of 31a … …, the supporting portion of 31a … …, the frame of 32 … …, the rotating body of 33 … …,34, 35 … … pendulum, 36 … … actuating mechanism, 41, 42 … … rotating shaft, 44 … … connecting member, 51 … … hooking member, 51a … … locking portion, 51B … … other end portion, 52 … … locking arm, 53 … … hooking rotating shaft, 54 … … force applying member, 55 … … rotating shaft, 56 … … locking pin, 57 … … connecting portion, 71 … … housing, 72 … … brake member, 73 … … roller, 74 … … guide member, 74A guide portion 202A, 202B, 37 guide portion of 84, 37B, and the guide portion of the guide shaft of 84, 37B, and the guide portion of the guide shaft of 84, and 37B … … B, and the guide portion of the guide shaft, and the guide member of the guide shaft of 84, and/or 300B … … B.

Claims

1. A construction elevator, comprising:

a guide rail arranged in the lifting path of the building in a neutral manner;

a machine room unit having a case body supported by the guide rail in a liftable manner and carrying a hoisting machine;

a car which is supported by the guide rail in a liftable manner and is connected with a rope wound around the traction machine; and

a crane for lifting and lowering the machine room unit,

the machine room unit has:

an emergency stop device provided in the case for stopping the lifting movement of the machine room unit; and

a speed detecting device provided in the case, for operating the emergency stop device when the lifting speed of the machine room unit is equal to or higher than a predetermined speed,

the emergency stop device is provided with a braking piece which is opposite to the guide rail with a gap in a normal state that the emergency stop device is not operated and is contacted with the guide rail when the emergency stop device is operated,

the speed detection device includes:

a rotating body that rotates in accordance with the lifting movement of the machine room unit;

a pendulum rotatably mounted to the rotating body and rotated by centrifugal force acting when the rotating body rotates; and

an actuating mechanism for actuating the emergency stop device when the pendulum rotates,

the machine room unit has:

a guide roller provided in the case and contacting the guide rail; and

and a synchronizing shaft that connects the guide roller and the rotating body, and transmits the rotational force of the guide roller to the rotating body.

2. The construction hoist according to claim 1, characterized in that:

the speed detection device is arranged at the upper part of the box body in the up-down direction,

the emergency stop device is arranged at the lower part of the box body in the up-down direction,

the machine room unit has a lift bar connected to the actuating mechanism and connected to a brake of the emergency stop device.

3. The construction hoist according to claim 1, characterized in that:

the rotating body is disposed in contact with the guide rail.

4. The construction hoist according to claim 1, characterized in that:

a pair of the braking members are provided with the guide rail sandwiched therebetween,

the emergency stop device has a guide portion that movably supports a pair of the brake members,

the braking member is formed in a wedge shape.

5. The construction hoist according to claim 1, characterized in that:

the machine room unit has a fixing mechanism that supports the case in the elevation path.