JP2004155523A - Elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent ascent and descent of a car during maintenance/inspection work to ensure worker's safety. <P>SOLUTION: An ascent and descent stop means for stopping ascent and descent of the car mechanically by fastening a balance weight 2 to a pit is provided. The ascent and descent stop means is composed of, for example, a fastening rope 21 fixed to a pit side and an engaging member 22 fixed to the balance weight 2. The balance weight 2 is fastened to the pit through the fastening rope 21 by engaging a hook 21a provided at a tip of the fastening rope 21 with the engaging member 22. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elevator apparatus in which a car and a counterweight connected by a main rope move up and down in a hoistway, and more particularly to a technique for surely stopping the elevator of a car during maintenance and inspection work.
[0002]
[Prior art]
In general, maintenance and inspection work of elevator equipment is performed by workers entering the machine room or hoistway.Especially, when workers enter the hoistway to perform work, Safety is extremely important. For this reason, the elevator apparatus is usually provided with various maintenance safety devices for ensuring the safety of workers during maintenance and inspection work.
[0003]
For example, a pit safety switch is provided near the entrance to the pit in order to ensure safety when a worker enters the pit below the hoistway and performs work. Then, the worker operates the pit safety switch to electrically stop the elevation of the car and then enters the pit to perform maintenance and inspection work.
[0004]
[Problems to be solved by the invention]
By the way, in recent years, so-called machine room-less elevators, in which each device previously installed in the machine room has been installed in the hoistway and the machine room has been abolished, making it possible to realize effective use of building space, have been developed. It has been proposed and has become widely available. In such a machine room-less elevator, since many devices are installed in the hoistway, there are inevitably more opportunities for workers to enter the hoistway and perform work during maintenance and inspection work.
[0005]
For this reason, ensuring the safety of workers during maintenance and inspection work has become more important than ever, and even if the pit safety switch is forgotten to be pressed or an erroneous operation occurs, the car will not There is a demand for ensuring the safety of workers by preventing them from going up and down in the hoistway.
[0006]
The present invention has been made in view of the conventional circumstances as described above, and during maintenance and inspection work, it is necessary to surely prevent the elevator from going up and down to ensure the safety of workers. It is an object to provide an improved elevator device.
[0007]
[Means for Solving the Problems]
An elevator apparatus according to the present invention connects a car and a counterweight with a main rope, and feeds the main rope by driving a hoist to raise and lower a car and a counterweight in a hoistway. The lifting weight is fastened to the lower part of the hoistway so as to stop the raising and lowering of the car mechanically.
[0008]
In this elevator device, for example, when a worker enters the hoistway and performs work during maintenance / inspection work, the lifting weight is fastened to the lower part of the hoistway by means of the hoisting and stopping means, so that the elevator can be raised and lowered reliably. As a result, the safety of the workers is sufficiently ensured.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
(1st Embodiment)
FIG. 1 schematically shows an entire configuration of an example of an elevator apparatus to which the present invention is applied. The elevator apparatus shown in FIG. 1 is configured as a so-called machine room-less elevator, and no machine room is provided above a hoistway 3 on which a car 1 and a counterweight 2 move up and down. The various devices conventionally provided in the machine room are provided in appropriate locations in the hoistway 3.
[0011]
The car 1 and the counterweight 2 are connected by a wire rope 4 as a main rope. One end of the wire rope 4 is fastened to a rope hitch 5 fixed to the upper part of the hoistway 3, and an intermediate portion of the wire rope 4 is laid over a lower car sheave 6 provided at a lower part of the car 1. Further, a middle part of the wire rope 4 is wound around a hoisting machine 7 installed at an upper part in the hoistway 3, and the other end side is fastened to the counterweight 2.
[0012]
The car 1 transports the passenger to the landing on the destination floor. When the car door 1a is opened in conjunction with the landing door 8, the passenger can enter and exit the car 1. I have. The counterweight 2 is for maintaining a weight balance with the car 1 and is composed of a weight slightly larger than the own weight of the car 1.
[0013]
In the elevator apparatus having such a structure, by driving the wire rope 4 by driving the hoisting machine 7, the car 1 and the counterweight 2 maintain the weight balance while moving in the hoistway 3 in opposite directions. Go up and down. That is, when the wire rope 4 is fed toward the car 1 by driving the hoisting machine 7, the car 1 descends in the hoistway 3 and the counterweight 2 moves the hoistway in accordance with the feed operation amount. It rises within 3. Conversely, when the wire rope 4 is fed to the counterweight 2 by the drive of the hoisting machine 7, the counterweight 2 is lowered in the hoistway 3 and the car 1 is raised / lowered in accordance with the amount of the feed operation. Go up in Road 3.
[0014]
In this elevator apparatus, the drive amount of the hoisting machine 7 is controlled in accordance with the landing call or the car call by the passenger, and the amount of movement of the car 1 and the counterweight 2 is adjusted by adjusting the amount of feed operation of the wire rope 4. Adjusted, the car 1 moves to the landing on the destination floor.
[0015]
A space called a pit is provided below the hoistway 3. In the pit, when the car 1 or the counterweight 2 further descends beyond the landing on the lowest floor for some reason, the lower end of the car 1 or the counterweight 2 is elastically supported and the impact is generated. A buffer 9 for absorbing the noise, various devices (for example, a control panel) 10 and the like are provided. Further, a pit safety switch 11 is provided near the landing door 8 on the lowest floor to ensure safety when an operator enters the pit and performs work during maintenance and inspection work. The pit safety switch 11 is operated when an operator opens the landing door 8 on the lowest floor and enters the pit. When the pit safety switch 11 operates, an electric safety circuit is established, the power supply to the hoist 7 is cut off, and the elevation of the car 1 and the counterweight 2 is electrically stopped. I have.
[0016]
In addition, in the elevator apparatus to which the present invention is applied, when the worker enters the pit and performs maintenance / inspection work or the like, the counterweight 2 is fastened to the bottom of the pit or the like, so that the car 1 and the counterweight can be used. A lifting / lowering stop means for mechanically stopping the lifting / lowering of No. 2 is provided. Hereinafter, a specific configuration example of the lifting / lowering stopping means will be described with reference to FIG.
[0017]
As shown in FIGS. 2 (A) and 2 (B), the lifting / lowering stopping means of the present embodiment includes a fastening rope 21 fixed to the pit side and an engaging member 22 fixed to the counterweight 2. You.
[0018]
The fastening rope 21 has its base end fixed to a counterweight base 12 installed on the bottom surface of the pit, and a hook 21a attached to its tip end. The buffer 9 and the guide rail 13 for guiding the movement of the counterweight 2 are fixed on the counterweight base 12. On the counterweight base 12, a hook storage case 23 for storing the hook 21a of the fastening rope 21 during normal operation is provided. In the hook storage case 23, a safety switch 24 which is operated in conjunction with the lifting / lowering stopping means is provided.
[0019]
Like the pit safety switch 11 described above, the safety switch 24 is for establishing an electrical safety circuit and electrically stopping the raising and lowering of the car 1 and the counterweight 2. That is, as shown in FIG. 2A, when the hook 21a of the fastening rope 21 is housed in the hook housing case 23 during normal operation, the safety switch 24 is pressed by the hook 21a and does not operate. State is maintained. When the worker enters the pit and performs maintenance and inspection work, as shown in FIG. 2B, when the hook 21a of the fastening rope 21 is taken out of the hook storage case 23, the hook 21a presses the hook. Is released, the operation state is established, a safety circuit is established, and the elevation of the car 1 and the counterweight 2 is stopped electrically.
[0020]
On the other hand, the engaging member 22 has a shape capable of engaging with the hook 21 a of the fastening rope 21, and is fixed to a lower portion of the counterweight 2. More specifically, the engagement member 22 is formed, for example, in a semicircular ring shape, and is fixed to a lower portion of the counterweight 2 with the curved portion protruding from the lower end of the counterweight 2. The hook 21a of the fastening rope 21 can be hooked on the projecting curved portion.
[0021]
In the lifting / lowering stopping means configured as described above, during normal operation, as shown in FIG. 2A, the hook 21 a of the fastening rope 21 is not 23. Therefore, in this state, the counterweight 2 can freely move up and down in the hoistway 2, and the car 1 can freely move up and down in the hoistway 2. Also, at this time, the safety switch 24 disposed in the hook storage case 23 is pressed by the hook 21a of the fastening rope 21 and the non-operation state is maintained, so that the car 1 and the counterweight 2 can be electrically connected. It can be moved up and down.
[0022]
On the other hand, when the worker enters the pit to perform maintenance / inspection work, the hook 21a of the fastening rope 21 is taken out of the hook storage case 23 as shown in FIG. It is engaged with the fixed engaging member 22. As a result, the counterweight 2 is fastened to the pit via the fastening rope 21, and the lifting of the counterweight 2 and the lifting of the car 1 are mechanically stopped. Also, at this time, the safety switch 24 disposed in the hook storage case 23 is released from the pressing of the fastening rope 21 by the hook 21a, and is put into an operating state. The elevator of the car 1 and the counterweight 2 is electrically stopped.
[0023]
Here, in the elevator apparatus to which the present invention is applied, a procedure when an operator enters the pit and performs maintenance and inspection work will be described.
[0024]
When performing maintenance / inspection work in the pit, the worker first stops the car 1 near the top floor and positions the counterweight 2 near the pit below the hoistway 3. Then, the landing door 8 of the landing on the lowest floor is opened, and the pit safety switch 11 is operated. As a result, an electrical safety circuit is established, and the elevation of the car 1 and the counterweight 2 is electrically stopped.
[0025]
Next, the worker enters the pit below the hoistway 3 from the landing on the lowest floor, takes out the hook 21a of the fastening rope 21 from the hook storage case 23, and removes the hook 21a from the hook 2a. The engaging member 22 is engaged. As a result, the balancing weight 2 is fastened to the pit via the fastening rope 21, and the lifting of the balancing weight 2 and the car 1 is mechanically stopped. At this time, the safety switch 24 is set to the operating state in conjunction with the removal of the hook 21a of the fastening rope 21 from the hook storage case 23. Therefore, the worker temporarily forgets to operate the pit safety switch 11 before entering the pit. Also, an electrical safety circuit is established by the operation of the safety switch 24, and the elevation of the car 1 and the counterweight 2 is electrically stopped.
[0026]
As described above, after raising and lowering the car 1 and the counterweight 2 are stopped both electrically and mechanically, the worker performs various maintenance and operations on the equipment 10 and the like disposed in the pit. Perform inspection work. Thereby, the safety during the work of the worker is sufficiently ensured.
[0027]
When various maintenance and inspection work on the equipment 10 and the like disposed in the pit is completed, the worker releases the engagement between the hook 21 a of the fastening rope 21 and the engaging member 22 fixed to the balance weight 2. Then, the hook 21 a of the fastening rope 21 is stored in the hook storage case 23. At this time, when the safety switch 24 is pressed by the hook 21a of the fastening rope 21, the safety switch 24 is brought into a non-operating state. In other words, until the hook 21a of the fastening rope 21 is stored in the hook storage case 23, the safety switch 24 is kept operating, and the car 1 and the counterweight 2 are maintained in a state in which the elevator is stopped electrically. You. Therefore, even if an attempt is made to resume the operation by mistake while the counterweight 2 is fastened to the pit, the car 1 and the counterweight 2 do not move up and down, and the vehicle moves up and down with the counterweight 2 fastened to the pit. The inconvenience of causing each member to be damaged due to the operation is also avoided beforehand.
[0028]
When the hook 21a of the fastening rope 21 is stored in the hook storage case 23 and the fastening state of the counterweight 2 with respect to the pit is released, the worker escapes from the pit to the landing on the lowest floor, and turns the pit safety switch 11 off. Switch to inactive state. As a result, the car 1 and the counterweight 2 can be raised and lowered both electrically and mechanically, and return to normal operation.
[0029]
As described above, in the elevator apparatus to which the present invention is applied, since the lifting weight stopping means for fastening the counterweight 2 to the pit and mechanically stopping the elevator of the car 1 and the pit 2 is provided, the worker When entering the pit and performing maintenance and inspection work on the equipment 10 and the like disposed in the pit, it is possible to reliably ensure the safety of workers.
[0030]
Further, the lifting / lowering stopping means engages the hook 21 a of the fastening rope 21 fixed to the pit side with the engaging member 22 fixed to the counterweight 2, so that the counterweight 2 is connected to the pit via the fastening rope 21. Since it has a very simple structure of being fastened, the cost of the apparatus does not increase significantly.
[0031]
Further, since the safety switch 24 that operates in conjunction with the lifting / lowering stopping means is provided separately from the pit safety switch 11, even if the operation of the pit safety switch 11 is forgotten, the car The electrical lifting and lowering stop state of the counterweight 1 and the counterweight 2 is ensured, and the safety of the worker can be more reliably ensured.
[0032]
(Second embodiment)
Next, another example of the lifting / lowering stopping means provided in the elevator apparatus to which the present invention is applied will be described with reference to FIG. Since the basic configuration of the entire elevator apparatus is the same as that of the first embodiment shown in FIG. 1, illustration and detailed description are omitted here.
[0033]
As shown in FIGS. 3 (A) and 3 (B), the lifting / lowering stopping means of the present embodiment includes a fastening rope 31 fixed to the counterweight 2 and an engaging member 32 fixed to the pit side. You. That is, in the lifting / lowering stopping means of the present example, the arrangement of the fastening rope 31 and the engaging member 32 is opposite to that of the above-described first embodiment.
[0034]
The fastening rope 31 has a base end fixed to a lower portion of the counterweight 2 and a hook 31a attached to a distal end thereof. Further, a hook storage case 33 for storing the hook 31a of the fastening rope 31 during normal operation is provided in a frame portion below the counterweight 2. In the hook storage case 33, a safety switch 34 that is operated in conjunction with the lifting / lowering stopping means is provided.
[0035]
As shown in FIG. 3 (A), when the hook 31a of the fastening rope 31 is stored in the hook storage case 33 during normal operation, the safety switch 34 is pressed by the hook 31a and the non-operation state is set. Will be retained. When the worker enters the pit and performs maintenance and inspection work, as shown in FIG. 3B, when the hook 31a of the fastening rope 31 is taken out from the hook storage case 33, the hook 31a presses the hook. Is released, the operation state is established, a safety circuit is established, and the elevation of the car 1 and the counterweight 2 is stopped electrically.
[0036]
On the other hand, the engaging member 32 has a shape capable of engaging with the hook 31a of the fastening rope 31, and is fixed to the counterweight base 12 provided on the bottom surface of the pit. More specifically, the engaging member 32 is formed, for example, in a semicircular ring shape, and is fixed to the counterweight base 12 with the curved portion protruding above the counterweight base 12. The hook 31a of the fastening rope 31 can be hooked on the projecting curved portion. In addition, on the counterweight base 12, in addition to the engagement member 32, the above-described buffer 9, a guide rail 13 for guiding the movement of the counterweight 2, and the like are fixed.
[0037]
In the lifting / lowering stopping means configured as described above, during normal operation, as shown in FIG. 3A, the hook 31a of the fastening rope 31 is not engaged with the engaging member 32, and the hook storage case is not provided. 33. Therefore, in this state, the counterweight 2 can freely move up and down in the hoistway 2, and the car 1 can freely move up and down in the hoistway 2. Also, at this time, the safety switch 34 disposed in the hook storage case 33 is pressed by the hook 31a of the fastening rope 31, and the non-operating state is maintained, so that the car 1 and the counterweight 2 can be electrically connected. It can be moved up and down.
[0038]
On the other hand, when the worker enters the pit to perform maintenance and inspection work, as shown in FIG. 3B, the hook 31a of the fastening rope 31 is taken out from the hook storage case 33 and the bottom of the pit is balanced. The engaging member 32 fixed to the weight base 12 is engaged. As a result, the balancing weight 2 is fastened to the pit via the fastening rope 31, and the lifting and lowering of the balancing weight 2 and the lifting and lowering of the car 1 are mechanically stopped. Further, at this time, the safety switch 34 disposed in the hook storage case 33 is released from the pressing of the fastening rope 31 by the hook 31a, and is put into an operating state. The elevator of the car 1 and the counterweight 2 is electrically stopped.
[0039]
As described above, the lifting / lowering stopping means of the present example also causes the hook 31a of the fastening rope 31 fixed to the counterweight 2 to engage with the engaging member 32 fixed to the pit side, thereby causing the counterweight 2 to move. Since the structure is extremely simple, such as fastening to the pit via the fastening rope 31, it is possible to ensure the safety of workers during maintenance and inspection work without incurring a significant increase in equipment cost. Can be.
[0040]
Further, since the safety switch 34 that operates in conjunction with the lifting / lowering stopping means is provided separately from the pit safety switch 11, even if the operation of the pit safety switch 11 is forgotten, the car The electrical lifting and lowering stop state of the counterweight 1 and the counterweight 2 is ensured, and the safety of the worker can be more reliably ensured.
[0041]
In the above, an example in which the present invention is applied to a so-called machine room-less elevator in which a machine room is not provided above the hoistway 3 has been described. However, the present invention is also applied to an elevator apparatus having a machine room. Effectively applicable. That is, even in an elevator apparatus having a machine room, a worker may enter a hoistway or a pit to perform maintenance / inspection work on various devices. By fastening the counterweight to the lower part of the hoistway, it is possible to further ensure the safety of the worker.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the elevator apparatus which concerns on this invention, the raising / lowering of a car can be stopped reliably at the time of maintenance / inspection work, etc., and the safety of the worker who works in a hoistway can be ensured reliably. .
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing an overall configuration of an elevator apparatus to which the present invention is applied.
FIGS. 2A and 2B are views showing an example of a lifting and lowering stopping means provided in the elevator apparatus, wherein FIG. 2A is an enlarged view of a main part showing a state in which hooks of a fastening rope are stored in a hook storage case, and FIG. The principal part enlarged view which shows the state which engaged the hook with the engagement member.
3A and 3B are diagrams showing another example of the lifting / lowering stopping means provided in the elevator apparatus, wherein FIG. 3A is an enlarged view of a main part showing a state where a hook of a fastening rope is housed in a hook housing case, and FIG. The principal part enlarged view which shows the state which engaged the hook of the rope with the engagement member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Riding car 2 Counterweight 3 Hoistway 4 Wire rope 7 Hoist 21 Fastening rope 21a Hook 22 Engaging member 24 Safety switch 31 Fastening rope 31a Hook 32 Engaging member 34 Safety switch

Claims (4)

An elevator apparatus that connects a car and a counterweight with a main rope and feeds the main rope by driving a hoist to raise and lower the car and the counterweight in a hoistway,
An elevator apparatus, comprising: lifting and lowering stopping means for fastening the counterweight to a lower portion of the hoistway to mechanically stop the raising and lowering of the car. A fastening rope having one end fixed to a lower portion of the hoistway and a hook provided on the other end;
An engaging member fixed to the counterweight,
The elevator apparatus according to claim 1, wherein the counterweight is fastened to a lower portion of the hoistway by engaging a hook of the fastening rope with the engagement member. A fastening rope having one end fixed to the counterweight and a hook provided on the other end;
An engagement member fixed to a lower portion of the hoistway,
The elevator apparatus according to claim 1, wherein the counterweight is fastened to a lower portion of the hoistway by engaging a hook of the fastening rope with the engagement member. A safety switch for electrically stopping the elevation of the car,
When the counterweight is not fastened to the lower portion of the hoistway, the safety switch is held in a non-operation state by the hook of the fastening rope, and the hook of the fastening rope is engaged with the engaging member, so that the balancing is performed. 4. When the weight is fastened to the lower portion of the hoistway, the safety switch is operated in conjunction with the weight, and the elevator of the car is stopped mechanically and electrically. An elevator apparatus according to claim 1.

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